Effect of an Isolated Active Compound PR

Research Article Open Access

Manggau et al., Trop Med Surg 2013, 1:3http://dx.doi.org/10.4172/2329-9088.1000125

Research Article Open Access

Tropical Medicine & Surgery

Volume 1 Issue 3 1000125Trop Med SurgISSN: 2329-9088 TPMS, an open access journal

Keywords: BVI03; Anti proliferation; Caspase-3; p53; HeLa cellsIntroduction

Treatment of cancer has drawn the attention and interest of researchers due to their great impact on the populations health. Two to 3% of deaths recorded worldwide annually arise from different types of cancer. The Boehmeria virgata Leaf have been widely used in Traditional Makassar Medicine to treat cancer [1]. B. virgata plant is classified in the Family Urticaceae [2].

In the previous study, we extracted and isolated B. virgata and showed its antiproliferative activity against HeLa cell line [3,4]. We now report the alkaloid active compound using a MTT-assay guided isolation and identified the positive spots using TLC and spectrophotometer ultraviolet and infrared.

The tumor suppressor protein p53 is a principal factor in regulation of growth arrest as well as apoptosis [5]. Many apoptotic signals are mediated to the cell death machinery via p53 [6]. It interacts with other proteins or functions as a transcription factor [7,8]. Indeed, in reponse to various types of stress, p53 becomes activated and, as a consequence, cells can undergo marked phenotype changes, ranging from increased DNA repair to senescence and apoptosis [9,10].

Apoptosis is characterized by chromatin condensation and DNA fragmentation, and is mediated by the cysteine protease family called caspases. Among them, caspase-1 and -3 have been shown to play a pivotal role in the apoptotic pathway that leads to chromosomal DNA fragmentation [11,12].

Mitochondria are involved in a variety of key events, including release of caspase activators, changes in electron transport, loss of mitochondrial membrane and participation of both pro- and anti-apoptotic Bcl-2 family proteins [13-15].

Materials and MethodsReagents

Trypsin-EDTA (Invitrogen, USA), Trypan blue, 3-(4,5-dimethyl-2-thiazolyl)- 2,5-diphenyl-2-tetrazolim bromide (MTT) were purchased from Sigma (St. Louis, MO, USA), Fetal Bovine Serum (FBS) was

purchased from GIBCO-BRL (NY, USA), Caspase 3 activity assay kit KM300 was obtained from R&D systems (Minneapolis, MN, USA.) and p53 activity assay kit BMS256 was obtained from eBioscience (Vienna, Austria).

Preparation of different plant extractsB. virgata (Forst) Guill leaf were collected from Malino (South

Sulawesi, Makassar, Indonesia) in the month of March. The plant was identified and authenticated. Fresh plant leaves were shade dried at room temperature, ground into fine powder, and then extracted (amount 1200 g) with solvents of methanol, hexane, n-buthanol and ethyl acetate. The extracts were concentrated under reduced pressure using a rotary evaporator to constant weight. The extracts were collected and preserved in a desiccators until used for further studies.

Isolation of active principle (BVI03) from Boehmeria virgata leaf

All the four extracts of B. virgata leaf were screened for their antiproliferative effect on HeLa cell line. The hexane extract was found to show maximum IC50; therefore, attempts were made to isolate the active principle from the hexane extract. The extract was subjected to column chromatography using silica gel G 60 as adsorbent. N-hexane: ethyl acetate in different ratio mobile phase which led to isolation of some compounds based on thin layer chromatography. All of these compounds were screened for their antiproliferative effect on HeLa cell line. Among the isolated compounds, one compound which was given

AbstractIn this study, we found that BVI03 an alkaloid compound isolated from B. virgate induced antiproliferation

against the human cervix carcinoma cell line HeLa. A MTT assay indicated that BVI03 had a strong tumor inhibition (IC50=0.126 g/mL), which was superior to that of tamoxifen (IC50=2.879 g/mL). This study also investigated the mechanism of antiproliferation induced by BVI03. Enzymatic activity using a colorimetric assay kit was performed to determine work mechanism of BVI03. Our data indicate that p53 and caspase-3 are involved in the process of BVI03-induced antiproliferative in HeLa cell compare with untreated HeLa cells.

Effect of an Isolated Active Compound (BVI03) of Boehmeria virgata (Forst) Guill leaves on Anti-Proliferation in Human Cancer Cervix HeLa Cells through Activation of Caspase 3 and p53 ProteinMarianti Manggau1*, Lukman1, Muhammad Rusdi2, Mochammad Hatta3, Wardihan A Sinrang4 and Subehan2

1Faculty of Pharmacy, Department of Biopharmacy, Hasanuddin University 90245, Makassar, Indonesia2Faculty of Pharmacy, Department of Pharmacognosy and Phytochemistry, Hasanuddin University 90245, Makassar, Indonesia3Faculty of Medicine, Department of Microbiology, Hasanuddin University, Makassar, Indonesia4Faculty of Medicine, Department of Physiology, Hasanuddin University, Makassar, Indonesia

*Corresponding author: Marianti Manggau, Faculty of Pharmacy, Department of Biopharmacy, Hasanuddin University 90245, Makassar, Indonesia, Tel: +62811412280; Fax: (+62)411-562741; E-mail: [email protected]

Received January 08, 2013; Accepted May 05, 2013; Published May 10, 2013

Citation: Manggau M, Lukman, Rusdi M, Hatta M, Sinrang WA (2013) Effect of an Isolated Active Compound (BVI03) of Boehmeria virgata (Forst) Guill leaves on Anti-Proliferation in Human Cancer Cervix HeLa Cells through Activation of Caspase 3 and p53 Protein. Trop Med Surg 1: 125. doi:10.4172/2329-9088.1000125

Copyright: 2013 Manggau M, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.



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trivial name BVI03 showed maximum IC50 and was used for further study, i.e. p-53 and caspase-3 activity (Table 1) (Figure 1).

Cell cultureHela (human cervical cancer cell line) was provided in Paracytology

Laboratory of Gadjah Mada University. The cells were cultured in an RPMI-1640 medium (Gibco, NY, U.S.A.) supplemented with 10% fetal bovine serum (Gibco, NY, U.S.A.), 100 IU/ml penicillin and 100 mg/ml streptomycin. The cell culture was maintained at 37C in humidified air with 5% CO2.

Antiproliferative Activity Assay (MTT Assay)The antiproliferative activity assay of BVI03 compound

was measured using MTT {3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide} assay (Sigma). The assay detects the reduction of MTT by mitochondrial dehydrogenase to blue formazan product, which reflects the normal function of mitochondria and cell viability. Exponentially growing cells were washed and seeded at 1104 cells/well for HeLa cell line (in 200 l of growth medium) in 96 well microplates (Nunc, Roskilde Denmark). After 24 h incubation, a partial monolayer was formed then the media was removed and 200 l of the medium containing the compound (iniatially dissolved in DMSO) were added and re-incubated for 48 h. Then 100 l of the medium were aspirated and 15 l of the MTT solution were added to the remaining medium (100 l) in each well. After 4 h contact with the MTT solution, blue crystals were formed. One 100 l of the stop solution were added and incubated further for 1 h.

Reduced MTT was assayed at 550 nm using a microplate reader (Biorad). Control groups received the same amount of DMSO (0.1%). Untreated cells were used as a negative control, while cells were treated with tamoxifen as a positive control. Eight concentrations (125, 62.5, 31.25, 15.63, 7.81, 3.91 and 1.95 g/ml) were prepared from each compound and tested against the HeLa cell line (Table 2). IC50 values were calculated as the concentrations that show 50% inhibition of proliferation on tested cell line. Stock solutions of the compounds were dissolved in DMSO then diluted with the medium and sterilized using 0.2 m membrane filters. The final dilution of the compound used for treating the cells contained not more than 0.1% (non-toxic concentration) DMSO. IC50 values were reported as the average of three replicates. The antiproliferative effect of the tested compounds was determined by comparing the optical density of the treated cells against the optical density of the control (Figure 2).

The cell viability (% of control) was calculated by the following equation:

(Absorbace control) (Absorbance sample)Cell viability % 100(Absorbace control)

=

Detection of Caspase 3 activity The enzymatic activity was assayed using a colorimetric assay kit

according to the manufacturers protocol. Briefly, 5106 cells were resuspended in 1 ml of Extraction Buffer. Incubate it for 2 hours at room

tubes and centrifuge at 1000g for 15 minutes. Aliquot cleared lysate to clean microfuge tubes. Lysates were than stored at -80C and assayed at a later time. Each well was added with 100 l of standard, sample and control per well, and incubated at room temperature for 2 hours.

0102030405060708090

100

0.00 2.00 4.00 6.00 8.00 10.00

%Vi

abili

ty o

f cel

ls

Concentrations (g/mL)

(IC50 = 0.126 g/mL)

Figure 1: Cytotoxicity effect of BVI03 on the Cell Proliferation and Cell Viability of Hela Cells after HeLa cells were treated with different concentrations of BVI03 (0.07; 0.15; 0.29; 0.59; 1.17; 2.34; 4.69 and 9.38 g/ml)) for 48 h, the cell viability was determined by MTT assay using ELISA reader. Values were presented as means S.D. of three independent experiments. p



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Aspirate each well and wash, repeating the process four times for a total of five washes by filling each well with 400 L of Wash Buffer. Add 100 L of active Caspase-3 Conjugate to each well and Incubate for 1 hour at room temperature, than repeat the aspiration/wash. Add 100 L of Substrate Solution (TMB) to each well. Incubate for 30 minutes at room temperature. Add 100 L of Stop Solution to each well. Gently tap the plate to ensure thorough mixing. Determine the optical density of each well within 30 minutes, using a microplate reader set to 450 nm. (Figure 3) The absorbance of both samples and the caspase-3 standards was determined (Table 3).

Assay of p53 activity The enzymatic activity was assayed using a colorimetric assay kit

according to the manufacturers protocol. Add 100 l Sample Diluent, in duplicate, to all standard wells. Pipette 100 l prepared standard into the first wells and create standard dilutions by transferring 100 l from well to well. Discard 100 l from the last wells. Add 100 l Sample Diluent, in duplicate, to the blank wells. Add 50 l Sample Diluent to sample wells. Add 50 l sample in duplicate, to designated sample wells. Add 50 l Biotin-Conjugate to all wells and incubate 2 hours at room temperature wash microwell strips 3 times with Wash Buffer. Add 100 l diluted Streptavidin-HRP to all wells and incubate 1 hour at room temperature, wash microwell strips 3 times with Wash Buffer. Add 100 l of TMB Substrate Solution to all wells and incubate the microwell strips for about 10 minutes at room temperature, Add 100 l Stop Solution to all wells. Absorbance of each microwell was read their absorbance of each microwell on Microplate Reader using 450 nm. The absorbance of both the samples and the p53 standards were determined (Figure 4).

Statistic analysis The significance of the difference between the treated and

untreated groups was determined with the Students t-test. The results are presented as mean S.D. of three independent experiments. The differences were considered significant at p



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Caspase 3 activityCaspases are the central executioners of apoptosis mediated by

various inducers. Caspases are synthesized as proenzymes that are activated by cleavage. Caspases-2, -8, -9 and -10 are termed apical caspases and are usually the first to be stimulated in the apoptotic process. Their activation in turn leads to their activation of effector caspases, in particular caspase-3 [11]. We have measured caspase-3 activity directly in the BVI03 induced apoptosis of HeLa cells. Caspase-3 activity is expressed as % activity in compare with untreated sample. Caspase-3 activity was clearly activated in BVI03-induced apoptosis. The amount of % activity was 2.66, which was 6.65 times higher than that released using lysates from untreated HeLa cells. The significantly higher caspase-3 activity in BVI03-treated samples was reproduced in three independent assays. (Table 4) shows the result of one representative experiment.

p53 in HeLa cells We next examined the signaling pathways involved in BVI03-

induced apoptosis of HeLa cells. Since pro-apoptotic protein p53 plays a crucial role in apoptosis and cell cycle arrest at G1 phase, we determined the effect of BVI03 on the protein level of p53 in HeLa cells. The expression of p53 protein gradually increased during the period of treatment of BVI03.

Acknowledgements

We gratefully thank to DP2M DIKTI (Directorate of Higher Education) Ministry of Education, Indonersia through Hibah Strategi Nasional Research Grant 2012 for financial support in the study.

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TitleCorresponding authorAbstractKeywordsIntroductionMaterials and MethodsReagentsPreparation of different plant extractsIsolation of active principle (BVI03) from Boehmeria virgataleafCell cultureAntiproliferative Activity Assay (MTT Assay)Detection of Caspase 3 activityAssay of p53 activityStatistic analysis

ResultsPhytochemical studyEffect of BVI03 on cell viability of HeLa cellsCaspase 3 activityp53 in HeLa cells

AcknowledgementsFigure 1Figure 2Figure 3Figure 4Table 1Table 2Table 3Table 4References

Effect of an Isolated Active Compound PR

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