Academic Sciences
Asian Journal of Pharmaceutical and Clinical Research
Vol 5, Suppl 4, 2012 ISSN - 0974-2441
Vol. 4, Issue 3, 2011
Research Article
ISSN - 0974-2441
EVALUATION OF IN VITRO ANTICANCER ACTIVITY OF HYDROALCOHOLIC EXTRACT OF
TABERNAEMONTANA DIVARICATA
AKHILA SRAVYA DANTU, SHANKARGURU P, RAMYA DEVI D, VEDHA HARI BN*
Department of Pharmaceutical Technology, School of Chemical and Bio-Technology, SASTRA University, Thanjavur, 613401, (T.N.), India
*Email: vedhahari@gmail.com
Received: 21 July 2012, Revised and Accepted: 3 September 2012
ABSTRACT
Tabernaemontana divaricata a native of India and many other tropical regions is a common garden plant that has been used traditionally for
treatment of a number of diseases. In the current study the hydroalcoholic extract of the flowers of the plant have been tested for anticancer
activity. The extract was prepared by soxhlet extraction method, petroleum ether and hydroalcohol were the solvents used. The in-vitro anticancer
studies were performed against human cancer cell line (HeLa) and MTT assay was used to analyze the cell growth inhibition. The results showed
that the hydroalcoholic extract of flowers of T.divaricata possessed a moderate amount of anticancer activity and the IC value was greater than100
50
źg/ml.
Keywords: HeLa, MTT assay, IC , medicinal flower.
50
INTRODUCTION
Medicinal plants have been in use from time immemorial and their solvent using a water bath maintaining at 60-80O C at ambient
utility has been increasing day by day in the present world. conditions to get a crude hydroalcoholic extract devoid of solvents.
Naturally obtained compounds are considered safer and easily
In-vitro evaluation of anticancer activity by MTT assay
biodegradable than synthetic compounds and the problem of drug
resistance observed in synthetic drugs is also reduced.1 Plants
Cell culture
represent a source of leads for many pharmaceutical compounds
and the phytochemical compounds and secondary metabolites The human cervical adenocarcinoma cell line (HeLa) was provided
present in plants have been used in treating a number of human
by National Centre for Cell Science (NCCS), Pune and was grown in
ailments. Drugs obtained from medicinal plants comprise 25% of
Eagles Minimum Essential Medium (EMEM) which contained 10%
total drugs in developed countries and about 80% in developing
fetal bovine serum (FBS). All cells were maintained at 37°C, 100%
countries.2
relative humidity, 5% CO2, 95% air and the culture medium was
changed twice a week.
Cancer is a disease that has always been a major threat and has been
characterized by proliferation of abnormal cells. Though
Cell treatment
Chemotherapy is now being used as a standard treatment method,3
search for anticancer agents from natural products has increased. In The monolayer cells were detached and single cell suspensions were
order to annotate the mechanism of prevention of cancer and to made using trypsin-ethylenediaminetetraacetic acid (EDTA). A
identify new anticancer activities a number of plants have been
hemocytometer was used to count the viable cells and the cell
explored. Tabernaemontana divaricata under the family
suspension was diluted with a medium containing 5% FBS in order
Apocynaceae is an ornamental, flowering, evergreen shrub that
to obtain final density of 1x105 cells/ml. 96-well plates at plating
generally grows to a height of 6ft and comes under the genus
density of 10,000 cells/well were seeded with one hundred
Tabernaemontana which consists of 100-110 species of flowering
microlitres per well of cell suspension and incubated for cell
plants.4 It is a common garden plant found in tropical countries
attachment at 37° C, 5% CO , 95% air and 100% relative humidity.
2
incuding Brazil, Egypt, India, Sri Lanka, Vietnam, Malaysia and
The cells were treated with serial concentrations of the test samples
Thailand.5 The flowers are white and sweetly fragnant,6 the leaves,
after 24 hr. Serial dilution method was used for preparing test
flowers, roots and stem of the plant have medicinal value and have
samples of different concentrations. Cells were initially dissolved in
been used traditionally for the treatment of ulcers and rheumatism,7
dimethylsulfoxide (DMSO) and further diluted with serum free
other medicinal properties of the plant include Anixolytic,6
medium to obtain twice the desired final maximum test
Antidiabetic8 and Anticonvulsant9 activities. The main aim of the
concentration. The required final drug concentrations of 18.75, 37.5,
present work was to evaluate the anticancer activity of dried flowers
75, 150, 300 µg/ml were obtained by adding aliquots of 100 µl of the
of T.divaricata.
different drug dilutions to the appropriate wells already containing
MATERIALS AND METHODS
100 µl of medium.
Plant collection and identification
After addition of the drug the plates were incubated for an
additional 48 hr at 37° C, 5% CO , 95% air and 100% relative
2
Flowers of T.divaricata were collected in the month of January and
humidity. The medium without samples served as control and
February at mornings and evenings and authenticated by Dr. N.
triplicate was maintained for all concentrations.
Ravichandran, CARISM, SASTRA University, Thanjavur- 613 401.
The herbarium is kept in the department.
MTT assay
Preparation of Extract
After 48h of incubation, to each well 15µl of MTT (5mg/ml) in
phosphate buffered saline (PBS) was added and incubated at 37° C
The fresh flowers of the plant were dried in shade for about 3 weeks
for 4h. The medium with MTT was flicked off and the formed
and ground using a mixer to a coarse powder. Using a soxhlet
extraction method, the powder of dried flowers were processed with formazan crystals were solubilized in 100µl of DMSO. Using micro
petroleum ether (40-50ºC) for 18 hrs in order to remove fat and plate reader the absorbance was measured at 570 nm. The % cell
unwanted components. The treated powder was further processed
inhibition was determined using the following formula. % Cell
with hydroalcoholic solution (25:75) by using same extraction
Inhibition = [100- Abs (sample)/Abs (control)] x100.
process for 18 hrs. The extract was concentrated by evaporating the
Hari bn et al.
Asian J Pharm Clin Res, Vol 5, Issue 3, 2012, 59-61
TABLE 1: Percentage cell growth inhibition of hydroacloholic extract of T.divaricata on HeLa cell lines by MTT assay
S. No. Concentration of the extract (µg/ml) Absorbance Inhibition of Cell growth (%)
1 18.75 0.406333Ä…0.012284 -2.35097
2 37.5 0.392667Ä…0.011086 1.09152
3 75 0.378667Ä…0.005312 4.617968
4 150 0.308Ä…0.004967 22.41814
5 300 0.260667Ä…0.004989 34.34089
6 Control 0.397Ä…0.004243 0
n=3
a b
c
FIG 1. Anticancer activity of T.divaricata extract against HeLa cells; a) control cells, b) 300 źg extract treated cells,
c) Concentration Vs % growth inhibition
Statistical analysis supported by a number of studies as follows: Clerodendrum
phlomidis crude extracts of petroleum ether, ethyl acetate,
The absorbance values were denoted as mean Ä… SEM. The IC is half
50
chloroform and ethanol obtained from the root of the plant were
the maximal inhibitory concentration of the toxic compound which
tested for cytotoxic activity on Mouse embryonic fibroblasts cell line
results in the reduction of biological activity by 50%. IC50 was
(NIH 3T3) and HeLa cell lines using MTT assay where ethanol
determined using GraphPad Prism software.
extract had no cytotoxic activity and the other extracts had
moderate to weak cytotoxic activity on both the cell lines.10 In
RESULTS AND DISCUSSION
another study four trifoliate plant extracts in different solvents were
In vitro anticancer activity
tested for cytotoxic activity against HeLa cell lines and MCF7 cell
lines and extract showed less significant activity against HeLa cell
The results for cell growth inhibition by the extract against Hela cell
lines but showed good activity against MCF7.11 In a research the
lines for various concentrations is shown in table 1. As the
methanolic extracts of Artocarpus heterophyllus was tested for
concentration increases there is an increase in the cell growth
anticancer activity by MTT assay on different cell lines like HEK293,
inhibition but is found to be very less with only 34.34089 % growth
A549, HeLa and MCF-7 .The IC value was found to be 35.26
50
inhibition at 300 µg. The IC value was more than 100 µg/ml and
50
źgm/ml by MTT assay against A549 but the extract had no activity
the regression value was difficult to analyse.
against HeLa and MCF-7 cell lines.12
The results obtained showed that hydroalcoholic extract of
T.divaricata had a very moderate anticancer activity which was
60
Hari bn et al.
Asian J Pharm Clin Res, Vol 5, Issue 3, 2012, 59-61
divaricata (L). International research journal of pharmacy
2011; 2(6): 123-127.
5. Wasana Pratchayasakul, Anchalee Pongchaidecha, Nipon
CONCLUSION
Chattipakorn, Siriporn Chattipakorn, Ethnobotany &
ethnopharmacology of Tabernaemontana divaricata. Indian J
The results obtained from the in-vitro studies performed using the
Med Res 2008; 127: 317-335.
HeLa cell lines reveals that the hydroalcoholic flower extract of
6. Basavaraj P, Shivakumar B, Shivakumar H, Anxiolytic Activity
T.divaricata has a moderate anticancer activity. Even though there
Of Tabernaemontana divaricata (Linn) R.Br. Flowers extract in
was increase in the cell growth inhibition when concentration of
mice. International Journal of Pharma and Bio Sciences 2011; 2
sample was increased, the IC value was more than 100 µg/ml for
50
(3): 65-72.
the cell line studies as shown by the MTT assay method. Hence the
7. Orient Longman, Indian Medicinal Plants. A compedium of 500
level of cytotoxicity of the hydroalcoholic extract of T.divaricata
species 1996; 5: 232-234.
flowers can be concluded to be less effective.
8. Masudur Rahman MD, Saiful Islam MD, Sekendar Ali MD,
ACKNOWLEDGEMENT
Rafikul Islam MD, Zakir Hossain. Antidiabetic and Cytotoxic
Activities of Methanolic Extract of Tabernaemontana divaricata
The authors are thankful towards the authorities of SASTRA
(L) Flowers. International Journal of Drug Development &
University, Thanjavur, India, for their extensive support and help for
Research 2011; 3(3): 270-276.
the successful completion of this work. Authors also wish to
9. Basavaraj P, Shivakumar B, Shivakumar H, Manjunath VJ,
acknowledge KMCH college of Pharmacy, Coimbatore, India, for the
Evaluation Of Anticonvulsant Activity Of Tabernaemontana
anti-cancer study.
divaricata (Linn) R. Br. Flower Extract. International Journal of
Pharmacy and Pharmaceutical Sciences 2011; 3(3): 310-315.
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61
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