Conventional therapies for malignant neoplastic disease are on the diminution as a consequence of their escalating restrictions and side effects. Conversely, natural merchandises are of increasing importance as prospective anticancer agents. Phyllanthus spp. , widely distributed throughout tropical and semitropical parts, had been studied extensively for its assorted medicative uses.
However, their anticancer potency has non been to the full elucidated. Yet, a drug that destroys the healthy cells although it acts efficaciously on the cancerous cells has small benefits. In this survey, both aqueous and methanolic infusions of four Phyllanthus spp. , viz. P.
niruri, P. urinaria, P. watsonii, and P. amarus, are tested for their anticancer belongingss. Two commercialised anti-cancer drugs, viz. Doxorubicin and Cisplatin were used as positive controls in this survey to compare the efficaciousness of the infusions. Phyllanthus workss have the possible to suppress the growing of MCF-7 and A549 cells with IC50 values runing from 50mg/ml to 180mg/ml and 65mg/ml to 470mg/ml for both methanolic and aqueous infusions severally.
On top of that, they have lesser toxicity on normal cells with cell viability per centum staying above 50 % when treated up to 1000mg/ml for both infusions. In contrast, Doxorubicin and Cisplatin have potent toxicity on both human malignant neoplastic disease and normal cell lines at concentrations & A ; lt ; 10mg/ml. Consequences obtained through cell rhythm analysis indicate that Phyllanthus workss caused cytotoxicity without a cell rhythm arrest consequence on the cancerous cells.
Alternatively, Phyllanthus has shown to bring on programmed cell death in cancerous cells with several fold addition of caspases-3 and -7, presence of DNA-fragmentation and TUNEL-positive cells. Roll uping these informations, Phyllanthus might be a possible and fresh chemotherapeutic agent, due to its cytotoxic authority every bit good as initiation of programmed cell death of unnatural malignant neoplastic disease cells.Keywords: Phyllanthus, Toxicity, Apoptosis, Cell Cycle Arrest Introduction
Worldwide, lung malignant neoplastic disease remains as the taking cause of mortality due to malignant neoplastic disease in both work forces and adult females with chest malignant neoplastic disease a close second.
Incidence of lung malignant neoplastic disease mortality in adult females is still on a rise although decease due to lung malignant neoplastic disease has been worsening in work forces ( Didkowska et al. , 2005 ) . The incidence of malignant neoplastic disease is expected to lift with an addition in aging population ( Jemal et al. , 2008 ) . In Malaysia, the proportion of malignant neoplastic disease patients aged more than 60 old ages was 4.6 % in 1957, increased to 5.
7 % in 1990 and is projected to be 9.8 % in 2020 ( Lim, 2002 ) . These might be due to people who have adopted unhealthy diets and lifestyle wonts of developed and industrialised states ( Parkin et al. , 2002 ) .Cancers when left untreated finally consequence in serious unwellness and most frequently, decease.
Unfortunately, there is still no absolute remedy for malignant neoplastic disease diseases yet ( Jemal et al. , 2008 ) . However, most of the malignant neoplastic diseases can be controlled by following appropriate conventional interventions such as surgery, radiation therapy and chemotherapy. But, this intervention may do a scope of side effects such as hurting, sickness, purging, immune system depression, alopecia, ulcers, and others to the patient with changing grades of badness ( Vasilis et al. , 2007 ) . For these grounds, the usage of conventional therapies may worsen with their escalating restrictions and side effects. Hence this has resulted in scientists worldwide seeking for alternate remedies in which a back-to-nature attack might give better possibilities to look for other options. Natural merchandises are carving a way as prospective anti-cancer agents ( Pederson et al.
, 1997 ) .During the mid twentieth century, the development of medical interventions for human disease was closely connected with a assortment of merchandises derived mostly from the works land. Despite recent developments in combinative chemical science that can quickly bring forth 1000s of new chemicals, the pharmaceutical industry still relies to a great extent on a astonishing array of undiscovered possibilities from the natural environment ( Cooper, 2004 ) . The find of several well-known anti-cancer agents from works beginnings such as Oncovin and Velban in 1950s initiated the United States National Cancer Institute ( NCI ) to get down a works aggregation plan.
These led to the find of legion fresh compounds with a scope of cytotoxic effects. Yet, there is non a plant-derived anticancer agent that has reached the phase of general usage ( Cragg and Newman, 2006 ) .Plant-derived drugs which have an of import function in herbal medical specialty, is a traditional signifier of redress to bring around assorted diseases particularly in developing states ( Rauh et al. , 2007 ; Ramzi et al.
, 2008 ) . This visit into the universe of drug find is an country pertinent to complementary and alternate medical specialty ( CAM ) . This appears about inevitable with the pattern of western medical specialty either shifting, or bridging the divide between western and eastern medical specialty through the intercession of CAM. Traditional Chinese Medicine ( TCM ) attack for malignant neoplastic disease intervention by utilizing natural herbal beginnings will kill merely the cancerous cells without harming the healthy cells every bit good as to beef up the organic structure ‘s immune system to contend off the cancerous cells ( Lin, 1996 ) . However, ethnopharmacological cognition is indispensable to take the hunt for workss with possible cytotoxic activity ( Galvez et al, 2003 ) .
The genus Phyllanthus, is one of the most widely distributed workss throughout the rain forests of The Amazon every bit good as other tropical and semitropical parts. Numerous researches on Phyllanthus spp. began in the late 1980 ‘s ( Paranjape, 2001 ) when clinical efficaciousness of P.
niruri against viral Hepatitis B was observed. P. niruri, locally known as dukung anak, was thought to arise from India. It can be found in about every tropical state due to its broad medicative uses without demoing toxicity ( Paranjape, 2001 ; Barros et Al, 2003 ) . Some of the studied medical benefits include hepatoprotective agent, to extinguish bilestone and kidney rocks, to handle enteric infections, diabetes, dermatosis, diarrhoea, diuretic, scabies, every bit good as against viral Hepatitis B ( Paranjape, 2001 ; Bagalkotkar et al.
, 2006 ) . In add-on, P. amarus had been employed for intervention of nervous infirmity, epilepsy, medhya ( intellect promoting ) , and anti-amnesic ( Joshi and Parle, 2007 ) .Although Phyllanthus spp. has been investigated for its assorted medicative belongingss, small has been done to analyze their anticancer activities. In this survey, the growing repressive potency of the Phyllanthus workss on assorted human normal ( 184B5: chest epithelial tissue and NL20: lung epithelial tissue ) and malignant neoplastic disease ( MCF-7: chest carcinoma and A549: lung carcinoma ) cell lines were assessed and later the possible manner of cell decease on treated malignant neoplastic disease cells was investigated.
Materials and Methods
High public presentation liquid chromatography ( HPLC ) coupled with Electron Spray Ionization ( ESI ) and Mass Spectrometry ( LC-MS- MS ) analysisSupernatant of the H2O extract sample was dried utilizing a vacuity concentrator ( concentrator 5301 eppendorf, Germany ) . For LC-MS-MS analysis, the lyophilized sample was redissolved into 20mg/ml with 30 % methyl alcohol.
Meanwhile, the entire supernatant of methanolic infusion samples were evaporated utilizing rotary evaporator ( rotavapor RII, BUCHI, Switzerland ) and re-dissolved with 20 % methyl alcohol. It were so subjected to solid stage extraction ( SPE ) column ( LiChrolut RP-18 1000mg/6ml, Merck Germany ) with nomadic stage of 60 % and 70 % methyl alcohol. All elutes collected were foremost concentrated to 0.5ml, followed by 8 times dilution utilizing 40 % methyl alcohol before LC-MS-MS analysis was perfomed.
HPLC system used dwell a HPLC binary pump, diode array sensor ( DAD ) , and an auto-sampler injector compartment ( 1200 series, Agilent Technologies, Germany ) . For separation, C-18, 150mm ten 4.6mm i.d, 5µm atom size Thermo Hypersil GOLD column ( Thermo Scientific, UK ) were chosen for rearward stage while nomadic stage of 0.1 % formic acid in H2O ( solvent A ) and 0.1 % formic acid in acetonitrile ( solvent B ) with a gradient scene of solvent B: 5 % ( 5min ) , 5-90 % ( 60 min ) , 5 % ( 4min ) at flow rate of 1ml/min was used. Detection wavelengths were both set at 280nm and 360nm with changeless injection volume at 20µl. 3200 QTrap LC/MS/MS system ( Appiled Bioscience – MDS Sciex ) was used for mass spectroscopy analysis, with the Fe beginning and electromotive force maintained at 500 EsC and -4.
5 kV for negative ionisation, severally. Nitrogen generator was set at 60 pounds per square inch drape gas flow, 60 pounds per square inch fumes gas flow, and 90 pounds per square inch beginning gas flow. Scaning manners chosen were Enhance Mass Spectrometer ( EMS ) and Enhance Ion Product ( EIP ) for full scan mass spectra that range from mass to bear down ratio ( m/z ) 100-1200.Plant infusions and Standard DrugsThe aqueous and methanolic infusions every bit good as fractions of the four Phyllanthus spp. , viz. P.
niruri, P. urinaria, P. watsonii and P. amarus, were kindly extracted and provided by Dr Indu Bala Jaganath from MARDI, Serdang, Malaysia. The aqueous and methanolic infusions were prepared by fade outing 10mg and 40mg in 1ml of unfertile PBS and DMSO to bring forth a stock concentration of 10mg/ml and 40mg/ml severally. Meanwhile, the fractions were prepared by fade outing 10mg in 1ml of unfertile PBS. The standard drugs used in this survey are Cisplatin and Doxorubicin ( MERCK ) .
These standard drugs were prepared by fade outing 1mg in 1ml of unfertile PBS to accomplish a stock concentration of 1mg/ml. The infusions and drugs were wrapped with the aluminum foil and kept at -20 & A ; deg ; C deep-freeze until farther usage.Cell CultureThe malignant neoplastic disease cell lines used in this survey includes lung carcinoma ( A549 ) and breast carcinoma ( MCF-7 ) purchased from American type Culture Collection ( Rockville, MD ) . They were grown in Roswell Park Memorial Institute 1640 ( RPMI-1640 ) and Dulbecco ‘s modified Eagles medium ( DMEM ) severally, supplemented with 10 % Fetal Calf Serum and incubated in a humidified ambiance with 5 % CO2 at 37 & A ; deg ; C. Two normal cell lines, bronchus epithelial tissue ( NL20 ) and breast epithelial tissue ( 184B5 ) were besides purchased from the American type Culture Collection ( Rockville, MD ) and cultured harmonizing to the maker ‘s instructions.Morphologic AnalysisCells were cultured in 6-wells home base in appropriate medium supplemented with 10 % FCS overnight. After 24 hours, cultured cells were treated with Phyllanthus infusions, Cisplatin, and Doxorubicin at their several Half Maximal Inhibitory Concentrations [ IC50 ] ( Budzinski et al. , 2000 ; Salvatore et al.
, 2004 ) and further incubated for 72 hours. Consequence of the infusions and drugs on the cells was so observed under a light microscope ( Olympus ) and exposure were taken at a magnification of 200X.MTS Cytotoxicity AssayCells were seeded at their optimum cell denseness ( 1 x 104 cells/well ) into a 96-wells microtiter home base followed by nightlong incubation to let cell fond regard. They were so treated with Phyllanthus fractions every bit good as both the aqueous and methanolic Phyllanthus infusions at a 6-points series dilution up to a concluding concentration of 1000µg/ml. Vehicle-control Wellss with cells merely and compound-control Wellss with infusions merely are included. Home plates are incubated at 37 & A ; deg ; C, 5 % CO2 and 100 % humidness at three different clip periods, which are 24, 48, and 72 hours. At the terminal of each incubation period, the cell viability was determined utilizing Cell Titer96 Aqueous Non-Radioactive Cell Proliferation Assay ( Promega, USA ) harmonizing to the maker ‘s instructions.
Optical density was measured utilizing GloMax Multi Detection System ( Promega, USA ) at a wavelength of 490nm with a mention wavelength of 750nm.Cell Cycle AnalysisCells were seeded at 105 cells/well, treated with infusions at their IC50 values, and incubated at assorted clip periods from 0 to 72 hours. At the terminal of each incubation period, cells treated with or without Phyllanthus infusions were harvested and fixed with ice-cold 70 % ethyl alcohol for at least 1 hr at -20 & A ; deg ; C. Cells were so pelleted, washed one time with PBS, resuspended in the Propidium Iodide ( PI ) solution [ 10µg/ml PI ( Sigma ) and 1mg/ml RNase A in PBS ] , and incubated in a 37 & A ; deg ; C H2O bath for 30minutes.
Data acquisition was performed utilizing a Becton Dickinson FACSCalibur flow cytometer and CellQuest package and later analysed utilizing WinMDI 2.9 package. The distribution of cell per centums in each cell rhythm stage is determined by puting Gatess based on their sum of DNA content.Deoxyribonucleic acid Fragmentation AnalysisDeoxyribonucleic acid atomization was carried out as described by Lin J et Al. ( 2003 ) with some alterations. Briefly, 5 ten 105 treated cells in 500µl were lysed in 55µl Deoxyribonucleic acid lysis buffer [ 1M Tris-HCI ( pH8.0 ) , 0.5M EDTA, and 100 % Triton X-100 ] and incubated at 4 & A ; deg ; C for 30 proceedingss.
Supernatant was so collected in a new tubing and DNA was extracted with an equal volume of phenol/choloroform/isoamyl intoxicant ( 25:24:1 ) . Sample was spun and merely the upper aqueous bed was transferred into a new tubing with subsequent add-on of equal volume of ice-cold 100 % ethyl alcohol and 1/10 volume of 3M Na ethanoate ( pH5.2 ) for Deoxyribonucleic acid precipitation at -20 & A ; deg ; C for nightlong. Sample was spun, supernatant was decanted without impacting the pellet ( DNA ) , and dried in air. After that, DNA was dissolved in deionized water-RNase solution [ 10mg/ml RNase I ] and incubated at 37 & A ; deg ; C for 30 proceedingss. Equal sums of DNA ( 10µg/well ) were electrophoresed in 1.2 % agarose gel impregnated with ethidium bromide at 5V for first 5 proceedingss and increased to 100V for 1 hr.
Deoxyribonucleic acid fragments were so visualized utilizing a UV transilluminator.Caspase checkCells were seeded, treated with infusions at their IC50 values, and incubated at 37 & A ; deg ; C, 5 % CO2 and 100 % humidness for 72 hours. Caspases activity was so determined utilizing Caspase-Glo 3/7 Assay ( Promega, USA ) harmonizing to the maker ‘s instructions. Briefly, lyophilized Caspase-Glo 3/7 substrate was resuspended in its buffer and 100µl of this reagent was added into each well. Contentss of Wellss were gently assorted and incubated at room temperature for 1 hr. Luminescence of each sample was measured utilizing a plate-reading luminometer.TUNEL checkTerminal Deoxynucleotidyl-Transferase mediated dUTP Nick End Labelling ( TUNEL ) check was performed utilizing ApopTag® Plus Peroxidase In Situ Apoptosis Detection Kit ( Chemicon® International ) . Briefly, 105 cells were harvested, fixed in 1 % paraformaldehyde in PBS, pH 7.
4 and later dried on a silanized microscope slide. After that, it was post-fixed in pre-cooled ethanol/acetic acid ( 2:1 ) and quenched in 3 % H peroxidase in PBS. Excess liquid was tapped off before 75µl/5cm2 of equilibration buffer was instantly applied on specimen. Next, 55µl/5cm2 of working strength TdT enzyme was added onto the specimen and incubated at 37 & A ; deg ; C for 1 hr. After incubation, specimen was placed in a coplin jar incorporating working strength stop/wash buffer followed by add-on of 65µl/5cm2 of anti-digoxigenin peroxidase conjugate. Specimen was washed in four alterations of PBS and stained with 75µl/5cm2 of peroxidase substrate.
The specimen was counterstained in 0.5 % ( w/v ) methyl green followed by several washes with distilled H2O, n-butanol, and xylene. Finally, the specimen was mounted under a glass coverslip in Permount and observed under a light microscope ( Olympus BX51 ) at a magnification power of 200X. Photographs are captured utilizing Olympus U-CMAD3 at three Fieldss per slide.Lactate Dehydrogenase ( LDH ) assayLDH check was performed utilizing CytoTox-ONE® Homogeneous Membrane Integrity Assay purchased from Promega, USA.
Cells were seeded, treated, and incubated for 72 hours. No-cell control, untreated cells control, and maximal LDH release control Wellss were included in each home base. At the terminal of incubation, lysis solution was added to positive Wellss and farther incubated for 30 proceedingss to bring forth maximal LDH release.
After that, an equal volume of CytoTox-ONE® Reagent was added into each well and incubated at room temperature for 10 proceedingss with subsequent add-on of stop solution. Fluorescence was recorded with an excitement wavelength of 560nm and an emanation wavelength of 590nm within 1 hr to avoid increased background fluorescence.Statistical AnalysisConsequences are expressed as average criterion divergence for at least three independent experiments. Differences between the agencies were deemed to be important if p & A ; lt ; 0.05 harmonizing to Students t-test.
Polyphenols designation in Phyllanthus spp.
Tables 1 and 2 showed the polyphenol compounds present in both methanolic and water-soluble infusions obtained from assorted species of Phyllanthus after analysis by HPLC coupled with photodiode array ( PDA ) and MS-MS sensing. There are 12 chief compounds identified based on their keeping times, UV spectra, parent mass spectra and secondary atomization forms, viz. Gallic acid, galloylglucopyronside, digalloylglucopyronside, trigalloylglucopyronside, tetragalloylglucopyronside, corilagen, geraniin, rutin, quercetin glucoside, quercetin diglucoside, quercetin rhamnoside, and caffeolquinic acid.Consequence of Phyllanthus infusions on cell morphologyUpon intervention with Phyllanthus infusions and standard drugs for 72 hours, both A549 and MCF-7 cells had displayed important morphological alterations characteristic of programmed cell death.
Some of them had been detached from the monolayer and were rounded up ( Figure 1a ) . Besides that, some of the cells had besides become granulated ( Figure 1b ) , possessed condensed chromatin ( Figure 1c ) , every bit good as membrane blebbing or with the presence of apoptotic organic structures ( Figure 1d ) .Consequence of Phyllanthus infusions, fractions and Standard Drugs on the growing of different cell linesThe MTS check was used in order to look into the possible cytotoxic effects of Phyllanthus infusions and fractions on the different cell lines, where the cells were treated at increasing concentrations up to 1000µg/ml for 24, 48, and 72 hours. Two standard drugs, viz. Cisplatin and Doxorubicin were used as positive controls in this survey, where the cells were treated at increasing concentrations up to 10µg/ml for 24, 48, and 72 hours. The cytotoxicity was recorded as IC50 ( µg/ml ) values, which resembles the concentration of infusions, fractions or drugs that kills or inhibits the growing of 50 % of the population ( Table 3 ) . Datas obtained showed that Phyllanthus infusions have the possible to suppress growing of A549 and MCF-7 with minimum consequence on the NL20 and 184B5.
As a comparing, growing suppression of Phyllanthus infusions on MCF-7 cells is shown to be more effectual than on A549 cells. From the informations, methanolic infusions of Phyllanthus exhibited greater cytotoxicity compared to the aqueous infusions for both malignant neoplastic disease cell lines. Among the four Phyllanthus species, P. watsonii showed the strongest cytotoxicity with lowest IC50 values for both aqueous and methanolic infusions on A549 and MCF-7 severally, followed by P.
urinaria, P. amarus, and P. niruri. In contrary, fractions of Phyllanthus are non every bit effectual as Phyllanthus extracts. Fractions 1 showed really low toxicity to both malignant neoplastic disease cell lines.
Fractions 2 were more toxic to malignant neoplastic disease cells compared to fractions 1, but non every bit toxic as Phyllanthus extracts. At the same clip, fractions 2 were toxic to the normal cells besides. Both standard drugs besides showed strong cytotoxicity on A549 and MCF-7 cells with IC50 values & A ; lt ; 10mg/ml.
However, they are besides really toxic to the normal cell lines with IC50 values comparable to their IC50 values for malignant neoplastic disease cells.Figure 2 illustrates the growing repressive curves of P. watsonii on both A549 and MCF-7 cells. Consequences for the other species are similar and therefore non shown here ( consequences are shown in auxiliary informations ) . Cells treated at low concentrations ( lesser than 50mg/ml for aqueous infusions and lesser than 25mg/ml for methanolic infusions ) of Phyllanthus infusions did non demo obvious decrease in growing. But, the growing of the malignant neoplastic disease cells is significantly decreased as the infusions concentrations additions. In add-on, it was besides found that cell growing suppression consequence increased with clip for 24, 48, and 72 hours.
Consequence of Phyllanthus infusions on cell rhythm distributionIn perennial experiments, our informations did non show any cell rhythm stage apprehension in both the A549 and MCF-7 cells treated with Phyllanthus infusions ( Figure 3 and 4 ) . However, at increasing incubation clip points ( 24, 48, and 72 hours ) , the per centum of gated cells for each cell rhythm stages ( G0/G1, S, and G2/M ) decreased for both A549 and MCF-7 cell lines with an addition in the figure of dead cells ( addition in Sub G1 stage ) . On the other manus, there is an accretion of cells at G2/M stage for both A549 and MCF-7 cells treated with Cisplatin and Doxorubicin.
Similarly, an addition in the figure of cells arrested at Sub G1 stage was noted, as this is one of the indexs for the presence of apoptotic cells.Consequence of Phyllanthus infusions on Caspase-3 and -7 activitiesCaspase-3 and -7 play important functions as early programmed cell death biochemical markers in mammalian cells. Caspase-Glo® 3/7 Assay uses a luminogenic substrate incorporating the DEVD sequence which is selective for caspase-3 and -7. The caspases activity in both non-treated and Phyllanthus-treated malignant neoplastic disease cells were measured after 72 hours and are shown in Figure 5.
Caspases activity degree detected in non-treated control cells correspond to the part of apoptotic cells present in the of course turning population due to natural aging. In treated cells, activities of Caspase-3 and -7 increased from 3-fold to 5-fold over basal degrees meaning an activation of these caspases in both A549 and MCF-7 cells treated with Phyllanthus infusions.Consequence of Phyllanthus infusions on atomic atomizationDeoxyribonucleic acid atomization in condensed chromatin and formation of apoptotic organic structures are some of the events of late programmed cell death ( Qiu et al. , 1998 ) . In order to farther show the ability of Phyllanthus infusions to bring on programmed cell death, DNA atomization check with Doxorubicin and Cisplatin as the positive controls was used to verify the presence of apoptotic cells in the treated civilized cells. Figure 6 showed a typical ladder-like form of Deoxyribonucleic acid fragments with multiples of about 180-200 bits per second after A549 and MCF-7 cells were treated with the infusions and standard drugs, one of the trademarks of programmed cell death.In add-on to that, the cell programmed cell death was determined in situ based on the enzymatic labelling of free 3′-OH end point of non-random DNA single-stranded and double-stranded interruptions with modified bases, ensuing in the apoptotic cells staining brown. After 72 hours intervention of the A549 and MCF-7 cells with Phyllanthus infusions and standard drugs, the per centum of apoptotic cells increased enormously every bit compared to the untreated control cells.
Since the cells were treated with the IC50 concentrations of infusions and drugs, the average per centum of apoptotic cells observed from 3 positions per slide varied from 28 % up to 55 % . Figure 7 and 8 showed the TUNEL-positive cells after intervention with aqueous and methanolic infusions of Phyllanthus, Cisplatin, and Doxorubicin.Consequence of Phyllanthus infusions on Cellular Membrane IntegrityLactate Dehydrogenase ( LDH ) is a cytosolic enzyme released into cell civilization supernatant due to compromised membrane unity, which is associated with necrotic cell decease. Its extent of activity of change overing tetrazolium salt into ruddy formazan merchandise is relative to the figure of necrotic cells ( Yang et al. , 2004 ) . Figure 9 showed the per centum of LDH released from the A549 and MCF-7 cells after 72hours intervention with each aqueous and methanolic infusions of Phyllanthus. From the information, the LDH sum released by Phyllanthus-treated cells remained at low degree ( & A ; lt ; 20 % ) comparable to the untreated cells. Similarly, intervention with Cisplatin and Doxorubicin which are well-known apoptosis-inducing drugs ( Abdolmohammadi et al.
, 2008 ) caused a low LDH degree release. Therefore, it suggests that Phyllanthus induces minimum cytotoxicity by interrupting membrane unity which leads to mortification.
The workss with genus Phyllanthus which comes from the household Euphorbiaceae have a long history in folks medicine. It has gained global attending of all time since the first study on the effectivity of P. niruri against Hepatitis B was published ( Venkateswaran et al.
, 1987 ) . Subsequently, its assorted curative belongingss had been reported including anti-hepatotoxic, anti-lithic, anti-hypertensive, and most late anti-HIV ( Bagalkotkar et al. , 2006 ; Sabir and Rocha, 2008 ) .
Besides that, there are besides some studies on the antitumor activity of assorted Phyllanthus workss. P. emblica demonstrated growing inhibitory activity on A549 and HepG2 ( Pinmai et al. , 2008 ) while toxicity of P. polyphyllus on MCF-7, HT-29, and HepG2 cells were reported with IC50 values of 27, 42, and 38?g/mL severally ( Rajkapoor et al.
, 2007 ) . However, the antineoplastic potency of Phyllanthus workss was non wholly elucidated yet. In our survey, we evaluated the toxicity of both aqueous and methanolic infusions of four different species of Phyllanthus workss, viz. P. niruri, P.
urinaria, P. watsonii, and P. amarus on two human malignant neoplastic disease cell lines ( A549 and MCF-7 ) and two normal human cell lines ( 184B5 and NL20 ) . Our informations showed that Phyllanthus selectively exhibits cytotoxicity to the MCF-7 and A549 human malignant neoplastic disease cells with IC50 values runing from 50mg/ml to 180mg/ml and 65mg/ml to 470mg/ml severally for both methanolic and aqueous infusions while holding lower toxicity to the normal cell lines.
Most antineoplastic activities exhibited by natural merchandises are attributed to the presence of phytochemicals within the works infusions ( Gopalakrishnan and Tony Kong, 2008 ; Russo, 2007 ; Issa et al. , 2006 ) . High Performance Liquid Chromatography surveies showed presence of several major phytochemicals in assorted parts of P.
niruri, including phyllanthin, Gallic acid, geraniin, ascorbic acid, lignans, quercetin, and estradiol ( Murugaiyah and Chan, 2007 ; Bagalkotkar et al. , 2006 ; De Souza et al. , 2002 ; Jerrold J.
Simon, 2002 ) . Complete recovery of these bioactive compounds from a multi-components works sample is non possible as a individual dissolver may non be sufficient to choose every individual constituent ( Markom et al. , 2007 ) .
Most of these phytochemicals dissolve better in organic dissolvers such as methyl alcohol and ethyl alcohol while they are merely partly soluble in polar dissolvers such as H2O ( Ojala et al. , 2000 ) . Therefore, most surveies reported the higher effectivity of ethanolic or methanolic infusions in suppressing the growing or being toxic to the assorted cancerous cells in vitro ( Saetung et al.
, 2005 ; Wu et al. , 2009 ) . Their consequences are consistent with the findings of this survey in which methanolic infusions of Phyllanthus spp. demonstrated greater toxicity to the A549 and MCF-7 cells in vitro compared to aqueous infusions.In add-on, Sun and Liu ( 2006 ) reported that non any single category of constituents in their infusion could be wholly accountable for the activity produced by the whole infusion itself.
We antecedently tested the toxicity of two Phyllanthus fractions on both malignant neoplastic disease ( A549 and MCF-7 ) and normal ( NL20 and 184B5 ) cell lines. The first fraction of Phyllanthus workss were either non toxic or showed really small toxicity to malignant neoplastic disease cells. Although the 2nd fraction of Phyllanthus showed toxicity to the malignant neoplastic disease cells, but they are non every bit strong as the Phyllanthus infusions tested and are besides being toxic to the normal cells. Therefore, it is more meaningful to measure the activity of Phyllanthus as a complete mixture of phytochemicals instead than measuring them as individual constituents. Some of the constituents discovered within the Phyllanthus species are geraniin, corilagen, galloylglucopyronside, digalloylglucopyronside, trigalloylglucopyronside, tetragalloylglucopyronside, corilagen, rutin, caffeolquinic acid, quercetin glucoside, quercetin diglucoside, and quercetin rhamnoside. Different species of Phyllanthus workss will hold fluctuation in the per centum of composing of each phytochemical constituent, hence giving rise to the different extent of cytotoxicity to malignant neoplastic disease cells. Among the four Phyllanthus species being studied, P.
watsonii showed the highest cytotoxicity to both A549 and MCF-7 cells in vitro. The per centum of compounds present in this peculiar Phyllanthus species that contributes to its cytotoxicity can non be disclosed as application of patency is in advancement.Cell rhythm upset plays a critical function in malignant neoplastic disease patterned advance. Therefore, transition of cell rhythm by phytochemicals from natural merchandise beginnings is deriving world-wide attending to command carcinogenesis ( Abdolmohammadi et al. , 2008 ) . In the present survey, undistinguished displacement in the cell rhythm phases for the cells treated with Phyllanthus infusions suggests that there is no direct correlativity between infusions ‘ cytotoxicity and specific cell rhythm apprehension. In contrast, Cisplatin and Doxorubicin caused a G2/M stage apprehension for both A549 and MCF-7 cells ( Fornari et al.
, 1999 ; Otto et al. , 1996 ; Sorenson et al. , 1990 ; Dan and Yamori, 2002 ) . Cisplatin works via formation of DNA adducts ensuing in the obstruction of reproduction, written text and fix mechanisms due to repressive action of the DNA adduct on the Deoxyribonucleic acid polymerase ( Zamble et al. , 1998 ) . Meanwhile, Doxorubicin ( Adriamycin ) acts as a topoisomerase II toxicant, intercalating between the DNA bases, and sequestering chainss followed by the coevals of free extremist taking to break of DNA ( Swift et al. , 2006 ) . However, an addition in the cell per centum at Sub G1 stage for MCF-7 cells treated with Phyllanthus infusions may mean an addition in the figure of apoptotic cells.
This therefore suggests programmed cell death as the manner of cell decease in the extracts-treated cells. However, this information is non conclusive plenty and necessitate to be farther confirmed with other apoptotic checks such as Caspases assay, TUNEL check, and DNA atomization check which are discussed below. Although Phyllanthus infusions besides caused programmed cell death in the treated A549 cells, but the cell distribution in Sub G1 stage is non really high and this explained the obscure DNA ladder sets on the agarose gel.Cytotoxicity on A549 and MCF-7 cells treated with Phyllanthus infusions may happen via two possible manners of cell decease, either through programmed cell death or mortification.
The former typically involves a multistage of DNA atomization ( Qiu et al, 1998 ) get downing with the release of cytochrome degree Celsius from chondriosome, activation of a cascade of caspases, debasement of PARP, and atomization of chromosomal DNA ( Pojarova et al. , 2007 ; Yang et al. , 2006 ) . Meanwhile, the latter is most oftenly associated with external harm taking to inadvertent cell decease, ensuing in mitochondrial and cytoplasmatic puffiness, followed by compromised membrane unity that finally burst let go ofing cytoplasmatic contents ( Woo et al. , 2008 ; Yang et al. , 2004 ) . An effectual and successful antineoplastic drug should has the ability to kill or impede the growing of malignant neoplastic disease cells without doing terrible injury to the healthy cells which could merely be achieved by triping programmed cell death in malignant neoplastic disease cells ( Abdolmohammadi et al. , 2008 ) .
Apoptosis can be diverged into two tracts ; extrinsic and intrinsic tracts which involve caspases that are constitutively expressed during programmed cell death. Extrinsic tract begins with the formation of a death-inducing composite to trip caspase-8 while intrinsic tract involved release of cytochrome degree Celsius from mitochondria membrane into cytosol, formation of apoptosome, and activation of caspase-9 ( Samali et al. , 1998 ; Kiechle and Zhang, 2002, Jin et al. , 2006 ) . Irrespective of which tracts, both will finally meet and trip the Caspases-3 and -7 which are the executing caspases ( Wu et al. , 2006 ) .
Based on our informations, programmed cell death occurs in the cells treated with Phyllanthus workss since the degree of these executing caspases increased several creases over the radical degree of untreated cells. Presence of these caspases indicates that the cells are continuing towards a terminal tract of cell decease and is hence an early biochemical marker for programmed cell death.Activation of caspase-3 will later trip the proteolytic cleavage of poly ( ADP-ribose ) polymerase ensuing in DNA atomization that normally occurs during the late programmed cell death ( Yang et al. , 2006 ; Wu et al. , 2009 ) . The Deoxyribonucleic acid fragments will look as a Deoxyribonucleic acid ladder on an agarose gel as shown in Figure 5 alternatively of a randomised DNA dislocation which is observed as a vilification for mortification. However, internucleosomal DNA atomization is non cosmopolitan as it may non ever occur during programmed cell death ( Vinatier et al. , 1996 ) .
Therefore, an in situ staining of the DNA breaks farther confirmed initiation of programmed cell death by Phyllanthus workss with the presence of TUNEL-positive cells shown in Figure 6.Although these surveies strongly suggest programmed cell death as the manner of cell decease induced by Phyllanthus infusions, mortification as the viing action can non be ruled out. Some of the cytotoxic agents have the ability to trip both apoptotic and necrotic cell decease tracts ( Woo et al. , 2008 ) . Hence, release of LDH by control and Phyllanthus-treated cells which is an index of mortification was assessed. Our informations revealed that LDH degree released from both the control and Phyllanthus-treated cells remained at low degree. Therefore, the possibility of mortification as the major manner of cell decease used by Phyllanthus can be excluded.
A conventional diagram picturing possible mechanism of action of Phyllanthus infusions on malignant neoplastic disease cells is presented in Figure 10. The anticancer activities of Phyllanthus workss were skewed towards its ability to do cytotoxicity on the malignant neoplastic disease cell lines without important correlativity with the initiation of cell rhythm apprehension. Its cytotoxicity potency is attributed to its capableness to bring on programmed cell death which is associated with the activation of caspases-3 and -7 every bit good as DNA atomization with low LDH degree released. This happening farther provides scientific groundss to turn out the traditional claims of Phyllanthus workss. Nevertheless, programmed cell death is the terminal consequence of consecutive events which begin with the consequence of natural works infusions on the malignant neoplastic disease cells. However, the upstream signaling that stimulates programmed cell death is yet ill-defined and farther probes are needed. There are several possibilities ; ( 1 ) initiation of tumor suppresser cistrons such as p53, ensuing in the overexpression of p21 that triggers growing apprehension or programmed cell death in malignant neoplastic disease cells ( 2 ) downregulation of proto-oncogenes such as c-myc that causes growing apprehension ( 3 ) activation of binding of Fas ligand to its receptor, hence bring oning programmed cell death of Fas-bearing cells ( Vinatier et al.
, 1996 ) . Knowledge of the manner of actions of these infusions would decidedly assist to place their possible applications in malignant neoplastic disease bar. The chief concern before application of the anti-proliferative agents as anticancer drugs is their in vivo consequence. Thus, farther testing of the infusions activity in vivo is a necessity to work it is a chemotherapeutic agent.Figure 1: Morphologic alterations of cells after treated with Phyllanthus infusions and standard drugs for 72 hours. Red pointers are indicating to each of these morphologies ; ( a ) detached and rounded cells, ( B ) granulated and vacuolated cells, ( degree Celsius ) cells with condensed chromatin, and ( vitamin D ) membrane blebbing or apoptotic organic structures. Color differences are due to alterations in light beginning of microscope. Typical consequence from three independent experiments was shown.
( Magnification power= 200x )Table 1: Polyphenol compounds detected in H2O infusions of Phyllanthus speciesCompoundRetention clip[ M-H ]m/zMS-MSatomizationPhyllanthus speciesGallic acid3.8169125,169P. amarus, P.
niruri,P. urinaria, P. watsoniiGalloylglucopyronside2.8331125, 169, 211, 271P. amarus, P. niruri,P. urinaria, P.
watsoniiDigalloylglucopyronside15.0483125, 169, 211, 271, 313P. amarus, P. niruri,P.
watsoniiTrigalloylglucopyronside23.0635125, 169, 211, 271, 313, 465P. urinariaCorilagen18.
0633301, 125, 169P. amarus, P. niruri,P. urinaria, P. watsoniiGeraniin22.0951301, 125, 169, 463P.
amarus, P. niruri,P. urinaria, P. watsoniiRutin26.0609301, 179, 151P. amarus, P. niruri,P. urinaria, P.
watsoniiQuercetin glucoside27.0463301, 179, 151P. amarus, P. niruri,P.
urinaria, P. watsoniiQuercetin rhamnoside30.0447301, 151P. urinaria, P. watsoniiCaffeolquinic acid23.0353191P.
amarus, P. niruri,P. urinaria, P. watsoniiTable 2: Polyphenol compounds detected in methanolic infusions of Phyllanthus speciesCompoundRetention clip[ M-H ]m/zMS-MSatomizationPhyllanthus speciesTrigalloylglucopyronside13.
0635125, 169, 211, 271, 313, 465P. urinariaTetragalloylglucopyronside15.0787169, 211, 313, 465P.
urinariaGeraniin12.0951301, 125, 169, 463P. amarus, P. niruri,P. urinaria, P. watsoniiQuercetin diglucoside9.0625463, 301P.
niruriTable 3: Cytotoxicity consequence [ IC50 ( mg/ml ) ] of Phyllanthus infusions against two malignant neoplastic disease cell lines ( A549, MCF-7 ) and two normal cell lines ( NL20, 184B5 ) after 72 hours incubation clip. Data is expressed as a mean of three independent experiments ± Standard Error Mean ( SEM ) .SolventsIC50 ( mg/ml ) ±SEMCancer Cell LinesNormal Cell LinesA549MCF-7NL20184B5Plant InfusionsP. niruri ( P.n )Aqueous466.7 ±41.63179.
7 ±0.58& A ; gt ; 500& A ; gt ; 500Methanol128.3 ±17.5662.3 ±9.07& A ; gt ; 500& A ; gt ; 500P.
urinaria ( P.u )Aqueous215.0 ±21.79139.
3 ±1.16& A ; gt ; 500& A ; gt ; 500Methanol69.0 ±11.5348.
7 ±10.02& A ; gt ; 500& A ; gt ; 500P. watsonii ( P.
w )Aqueous198.3 ±10.41104.0 ±10.39& A ; gt ; 500& A ; gt ; 500Methanol61.3 ±16.
1749.0 ±8.19& A ; gt ; 500& A ; gt ; 500P. amarus ( P.a )Aqueous240.0 ±26.
46156.7 ±5.77& A ; gt ; 500& A ; gt ; 500Methanol126.7 ±7.6456.
3 ±6.66& A ; gt ; 500& A ; gt ; 500Standard DrugsCisplatin7.6 ±1.101.
4 ±0.540.9 ±0.053.0 ±0.
4 ±0.050.3 ±0.020.6 ±0.
03Fraction 1P. niruriAqueous380.0 ±18.
03438.3 ±11.55266.7 ±41.93283.3 ±25.17P.
urinariaAqueous& A ; gt ; 500& A ; gt ; 500& A ; gt ; 500231.7 ±18.93P. watsoniiAqueous395.0 ±8.
66376.7 ±2.89241.7 ±20.21230.0 ±26.46P.
amarusAqueous& A ; gt ; 500& A ; gt ; 500& A ; gt ; 500& A ; gt ; 500Fraction 2P. niruriAqueous228.3 ±5.7781.7 ±16.
07108.3 ±5.77230.0 ±50.
74P. urinariaAqueous225.0 ±13.2361.
7 ±12.5895.0 ±5.00230.0 ±13.23P. watsoniiAqueous225.
0 ±43.3046.7 ±10.41105.0 ±5.00201.7 ±20.
21P. amarusAqueous264.3 ±45.
7 ±7.64213.3 ±54.85( a ) ( B )( degree Celsius ) ( vitamin D )Figure 2: Growth inhibition consequence of ( a ) aqueous infusions of P. watsonii on A549, ( B ) methanolic infusions of P.
watsonii on A549, ( degree Celsius ) aqueous infusions of P. watsonii on MCF-7, and ( vitamin D ) methanolic infusions of P. watsonii on MCF7. Each cell lines were treated at changing concentrations for 24, 48, and 72 hours. Error saloon indicates the standard mistake of the mean of three independent experiments.( a )( B )( degree Celsius )Figure 3: Percentage of cell rhythm stage distribution of A549 cells treated with both aqueous and methanolic Phyllanthus infusions and standard drugs at their IC50 ( mg/ml ) concentrations for ( a ) 24 hours, ( B ) 48 hours, and ( degree Celsius ) 72 hours. Error saloon indicates the standard mistake of the mean of three independent experiments.( a )( B )( degree Celsius )Figure 4: Percentage of cell rhythm stage distribution of MCF-7 cells treated with both aqueous and methanolic Phyllanthus infusions and standard drugs at their IC50 ( mg/ml ) concentrations for ( a ) 24 hours, ( B ) 48 hours, and ( degree Celsius ) 72 hours.
Error saloon indicates the standard mistake of the mean of three independent experiments.Figure 5: Activity degree of Caspase-3 and -7 released from A549 and MCF-7 cells treated with both aqueous and methanolic Phyllanthus infusions and standard drugs at their IC50 ( mg/ml ) concentrations after 72 hours. Error saloon indicates the standard mistake of the mean of three independent experiments. P.N – P. niruri, P.
U – P. urinaria, P.W – P. watsonii, P.
A – P. amarus, CIS – Cisplatin, DOX – Doxorubicin, CTRL – Non-treated cells.
M 1 2 3 4 5 6 7 8 9 10 11 11
M 1 2 3 4 5 6 7 8 9 10 11 11
Figure 6: Deoxyribonucleic acid atomization of ( a ) A549 and ( B ) MCF-7 cells treated with P.watsonii and standard drugs at their IC50 ( mg/ml ) concentrations for 72 hours. Red pointers at the right are indicating to the sets of Deoxyribonucleic acid fragments. Typical consequence from three independent experiments was shown. Meter: Molecular-weight marker, Lane 1 – 4: aqueous infusions of P. niruri, P. urinaria, P. watsonii, and P. amarus, Lane 5 – 8: methanolic infusions of P. niruri, P. urinaria, P. watsonii, and P. amarus, Lane 9: Cisplatin, Lane 10: Doxorubicin, and Lane 11: Untreated control.
% Apoptotic cells: 6.8 ± 0.01
% Apoptotic cells: 44.8 ± 0.05
% Apoptotic cells: 39.4 ± 0.04
% Apoptotic cells: 46.7 ± 0.11
% Apoptotic cells: 42.3 ± 0.15
% Apoptotic cells: 53.7 ± 0.05
% Apoptotic cells: 54.1 ± 0.11
% Apoptotic cells: 29.4 ± 0.08
% Apoptotic cells: 50.4 ± 0.08
% Apoptotic cells: 49.0 ± 0.08
% Apoptotic cells: 55.4 ± 0.03
Figure 7: Red pointers demoing TUNEL-positive A549 cells ; ( a ) non-treated and after treated with ( B ) aqueous P. niruri, ( degree Celsius ) aqueous P. urinaria, ( vitamin D ) aqueous P. watsonii, ( vitamin E ) aqueous P. amarus, ( degree Fahrenheit ) methanolic P. niruri, ( g ) methanolic P. urinaria, ( H ) methanolic P. watsonii, ( I ) methanolic P. amarus, ( J ) Cisplatin, and ( K ) Doxorubicin at their IC50 ( mg/ml ) concentrations for 72 hours. Typical consequence from three independent experiments was shown. ( Magnification power: 200X )
% Apoptotic cells: 41.2 ± 0.10
% Apoptotic cells: 43.8 ± 0.09
% Apoptotic cells: 44.7 ± 0.05
% Apoptotic cells: 50.3 ± 0.05
% Apoptotic cells: 33.7 ± 0.11
% Apoptotic cells: 28.4 ± 0.04
% Apoptotic cells: 53.3 ± 0.12
% Apoptotic cells: 52.6 ± 0.03
% Apoptotic cells: 42.8 ± 0.01
% Apoptotic cells: 7.1 ± 0.04
% Apoptotic cells: 44.6 ± 0.10
Figure 8: Red pointers demoing TUNEL-positive MCF-7 cells ( a ) non-treated and after treated with ( B ) aqueous P. niruri, ( degree Celsius ) aqueous P. urinaria, ( vitamin D ) aqueous P. watsonii, ( vitamin E ) aqueous P. amarus, ( degree Fahrenheit ) methanolic P. niruri, ( g ) methanolic P. urinaria, ( H ) methanolic P. watsonii, ( I ) methanolic P. amarus, ( J ) Cisplatin, and ( K ) Doxorubicin at their IC50 ( mg/ml ) concentrations for 72 hours. Typical consequence from three independent experiments was shown. ( Magnification power: 200X )Figure 9: Percentage of Lactate Dehydrogenase ( LDH ) released from A549 and MCF-7 cells treated with both aqueous and methanolic Phyllanthus infusions and standard drugs at their IC50 ( mg/ml ) concentrations after 72 hours. Error saloon indicates the standard mistake of the mean of three independent experiments. P.N – P. niruri, P.U – P. urinaria, P.W – P. watsonii, P.A – P. amarus, CIS – Cisplatin, DOX – Doxorubicin, CTRL – untreated cells, and MAX – Maximum Lysed Cells.Figure 10: A Conventional Diagram depiction possible mechanism of action of Phyllanthus infusions on malignant neoplastic disease cells. Based on this survey, programmed cell death is the terminal consequence due to toxicity of Phyllanthus. However, elaborate mechanisms that lead to apoptotic events remained to be clarified.