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Emily Berry
Biology Pre- Medicine with a Chemistry minor
Dr. P Caffrey, Dr. Zuchelkowski, Dr. Aune, Dr. Fox
Ovarian Cancer, Glutathione S-Transferase, Resveratrol

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Abstract
Ovarian cancer cells have the ability to become resistant to different
chemotherapy drugs, including one of the most commonly prescribed drugs Doxorubicin.
This drug specifically is focused on during our research. Many previous research studies
have investigated causes of ovarian cancer cell resistance, such as the protective enzyme
glutathione S-transferase (GST). Studies have also been performed on methods of
inhibiting this resistance, possibly through the use of resveratrol, a component found in
grapes and red wine. However, some doses of resveratrol have been found to result in an
increase in resistance. In order to further investigate the cell’s sensitivity or resistance,
this experiment examined a range of doses of doxorubicin and resveratrol administered to
ovarian cancer cells. The samples were later analyzed to see if they were preventing or
promoting chemotherapy resistance. Doxorubicin and resveratrol pretreatment were
administered to triplicate cultures of ovarian cancer cells, either together or separately,
and were left in this pretreatment for two days. At this time, replicate dishes of the cells
were tested for their GST activity. The GST activity data was collected from a
spectrophotometer, measuring the amount of product that was produced via a
colorimeteric reaction. We recognized that GST activity may be proportional to
doxorubicin resistance in these pretreated ovarian cancer cells. Data was taken for control
groups, resveratrol alone, doxorubicin alone, and a combination of doxorubicin and
resveratrol treatments at various dosages. Questions aimed to be answered during this
study were as follows: In cases where doxorubicin pretreatment results in resistance to
doxorubicin, is it accompanied with increased GST levels or are they unrelated.
Additionally, if resveratrol causes resistance to doxorubicin alone does it do so by
increasing GST levels or through an alternative mechanism. In other words, can the

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varying degrees of doxorubicin resistance be caused by doxorubicin and/or resveratrol
pretreatment. Also, will doxorubicin resistance reflect an increase in GST activity (ie.
low GST activity relays low resistance, high GST activity relays high resistance). Further
studies will be needed to confirm if resistance was formed by the ovarian cancer cells due
to receiving the resveratrol and doxorubicin pretreatments.
Index Terms—Ovarian Cancer Cells, Chemotherapy Resistance, Doxorubicin, Resveratrol, Glutathione Stransferase

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Introduction
Ovarian cancer accounts for 5% of all deaths due to cancer in the United States,
which in part is assumed to be due to its tendency to become resistant to multiple
chemotherapy regimens (1). Ovarian cancer is the most life threatening gynecological
cancer and continues to take women’s lives at an alarming rate. The common treatments
of ovarian cancer include platinum-based drugs such as cisplatin, as well as doxorubicin
which is an anthracyclin. Anthracyclins are also referred to as anthracycline
topoisomerase inhibitors. This chemotherapy drug acts by embedding itself in between
the base pairs of the DNA helix, therefore preventing the progression of replication and
eventually halting gene expression (2). However, cancer cells are able to prevent
doxorubicin from having an effect by removing it from the cell itself. The challenge of
overcoming chemotherapy resistance is an ongoing battle and continues to become more
pivotal in saving the lives of the many women affected by this deadly cancer.
Ovarian tumors are more commonly prone to developing resistance to their
chemotherapy over time, therefore ovarian cancer research for chemotherapy resistant
cells is at the forefront of new treatment research. Although the use of platinum-based
agents has increased the survival rates of patients, data supports that the majority who
relapse after the first round of chemotherapy will eventually be overtaken by the resistant
tumor cells, even when treated with other therapies (3).
Thus far, the various mechanisms of resistance are not entirely understood. Of the
mechanisms studied previously, the one specifically analyzed in this experiment is
Glutathione S-transferase activity. Glutathione S-transferases (GSTs) are metabolic
enzymes that in conjunction with their substrate, glutathione (GSH), are present

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throughout the body with the primary purpose of detoxifying foreign substances. The
GST enzyme conjugates GSH to toxic compounds such as chemotherapy drugs. By
attaching GSH to the drug, the cell recognizes them as foreign and harmful and is then
able to remove the GST/GSH/drug complex from the cytoplasm through drug
transporters, such as a multi-drug resistance associated protein (6). After being removed,
the drug is incapable of harming the ovarian cancer cell and in turn, GST has begun to
create resistance to the chemotherapy drug. Although the GST mechanism of resistance is
the main focus of this study, other forms of resistance to chemotherapy have been found.
Resistance may also be induced from p-glycoprotein, an efflux of drug from transporters,
detoxifying enzyme inhibition, as well as altered gene expression of apoptotic signaling
for tumor suppressors and proteins (7). Since GST has previously been observed to be
affected by resveratrol, we chose to investigate the effect of resveratrol in combination
with doxorubicin on GST activity.
Most studies of drug resistance are performed on cells that have already
developed resistant because they were previously exposed to a chemotherapy drug in the
patient. These resistant cells are then compared to non-resistant cells from patients who
never received chemotherapy. However, some research studies have produced methods of
reproducing resistance over a few days in vitro, allowing researchers to observe the
development of resistance as it occurs (4,5). Using these methods, researchers reported
the increase in GST activity in ovarian cancer cells during the development of resistance
to the drug cisplatin (5). These methods encourage the study of new treatments using
natural compounds that could lower GST activity, such as resveratrol.

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Resveratrol (3,5,4’-Trihydroxystilbene) is a natural polyphenol, which is found in
grapes and in red wine. Previous studies have shown that resveratrol may aide in
inducing autophagocytosis, disrupting angiogenesis, and/or inhibiting insulin or seruminduced growth of ovarian cancer (8). Other data has shown that resveratrol may have an
adverse effect and may ultimately create resistance, or have no effects towards the
chemotherapy (9,10). One study also noted that resveratrol showed promising anti-tumor
growth capabilities when in vitro, but did not show any positive results in an in vivo
setting (11), which may be an indication that resveratrol’s effects are dependent on its
environment. This factor will be the main focus throughout this study and will be
investigated at multiple doses with doxorubicin, as well as by itself.
The purpose of this study is to test the effect of resveratrol on doxorubicin
resistance via GST activity in ovarian cancer cells. A range of doses of resveratrol alone,
doxorubicin alone and the two in combination will be studied. This study investigates
GST activity as a mechanism for the development of chemotherapy drug resistance. By
identifying the enzyme activity in ovarian cancer cells following pretreatments intended
to cause or prevent resistance, it may be possible to determine whether GST activity
reflects the development of resistance to the drug doxorubicin. A spectrophotometer is
used to measure the production of the conjugate product that is formed by the substrates
1-Chloro-2,4-dinitrobenzene (CDNB) and GSH by GST activity (12). This colorimetric
enzyme reaction is monitored for the change of absorbance readings that occur from the
reaction’s color change over time. The change in absorbance readings over a period of
time, directly correlates to an increase in GST activity and provides data supporting there
is drug resistance occurring at that time.

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Figure 1: Chemical structure of Doxorubicin chemotherapy drug.

Figure 2: Resveratrol (3,5,4’-Trihydroxystilbene) chemical structure
Materials and Methods
General Procedure
This study was conducted with a line of high grade serous ovarian cancer cells
(A2780) purchased from AddexBio Technologies that are known to be initially sensitive
to chemotherapy drugs and of low GST starting levels. These cells had been maintained
in a nutrient medium of F12/DMEM plus 7% FBS from Life
Technologies/ThermoFischer alone or with a pretreatment dose of resveratrol or
doxorubicin at 37℃ and at 5% CO2. Replicate cultures were first pretreated with a range
of doses of doxorubicin alone, resveratrol alone or a combination of the two. For each of
these pretreatments, duplicate culture dishes were set aside for GST analysis. Cells of
each culture and dosage were counted throughout each trial to determine the change of
proliferation in response to treatments.
GST Assay Procedure

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Cultures of cells were scraped off of the bottom of the plates using a sterile pipet and 1
ml PBS mix to dislodge the cells after excess growth medium was poured off into waste.
Cells were placed in centrifuge tubes and centrifuged in an International Clinical
Centrifuge at setting 4 for 5 minutes. Pellets were preserved and the supernatant was
poured out as waste. The pellet was then resuspended in 1 ml of PBS homogenizing
buffer (Life Technologies/ThermoFischer). If necessary, the solutions were frozen at 20℃ until ready to test. Cell samples, 1-Chloro-2,4-dinitrobenzene (CDNB), and
glutathione (GSH) were consistently kept on ice when not being used. The GST activity
assay measures the conjugation of 1-chloro, 2,4-dinitrobenzene (CDNB, Sigma Aldrich)
with reduced glutathione (GSH, Sigma Aldrich). The reaction produces a dinitrophenyl
thioether which is detected by a spectrophotometer at 340 nm. Based on the levels of
GST, a specific amount of the reaction product is conjugated per minute. The assay
cocktail formula for each of the cultures tested were as follows: 4.8 ml of PBS mix, 0.60
ml of CDNB, and 0.60 ml of GSH. For each of the individual cell samples from the
various trials and dosages, 0.60 ml of their specific cell sample were placed into the assay
cocktail for testing. The blank test tube received this assay cocktail and received 0.60 ml
of PBS instead of a cell sample. The spectrophotometer was zeroed with a blank test tube
at a wavelength of 340 nm and an absorbance of zero. In some cases, wavelengths were
adjusted to compensate for spectrophotometer drift in its readings of the blank test tube.
The change of absorbance over time was calculated by taking the final absorbance
reading subtracted by the starting absorbance reading, shown in the equation below. The
GST activity was also calculated by the following equation.

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∆ absorbance=(A340 at Time 1) - (A340 at Time 2)
GST activity (Units/cell)=(∆ absorbance)x(0.0096 µM-1/cm)×(0.3 ml)

Statistics
Means and standard deviations were calculated using Xcel. Statistical significance was
calculated by an unpaired 2-tail t test. Asterisks will be used to indicate statistical
significance compared to control GST activity for a P value less than 0.05.
Results
The effect of resveratrol, doxorubicin, or both in combination on GST activity
was measured by the production of dinitrophenyl-thioether, resulting in a color change
that was detected by a spectrophotometer at approximately 340 nm. In all cases, the
numbers represent the change in absorbance over 60 seconds of three replicate cell
cultures in each of the indicated treatment doses. There are not replicate readings of the
same sample, only replicate readings of different samples with the same cells and doses.
For each of the cell treatments, the cells were counted, extracts were made from the cell
cultures and the extracts were tested for GST activity, as described in Materials and
Methods.
Control Cells
The control cells were pretreated with only culture medium instead of either drug. The
change in absorbance over 60 seconds showed an average of 0.012 change in absorbance
with a standard deviation of 0.0067. This data can be found in Figures 3 and 4. The GST

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activity equation was used to calculate the GST activity for the control sample and found
to be 7.32 x 10-12units/cell. This data can be found in Figure 5. An average GST activity
value was calculated to be 6.45 x 10-12units/cell with a standard deviation of 3.95 x 1012. This data can be found in Figure 6.
Resveratrol Pretreated Cells
Two different doses of resveratrol were administered to the cells as a pretreatment. The
average change of absorbance for the 11µm dose was .0023 with a standard deviation of
0.0137. The average change of absorbance for the 17µm dose was .0018 with a standard
deviation of 0.004. This data can be found in Figures 3 and 4. Using the GST activity
equation, the calculated GST activities, found in Figure 5, showed that cells with the
11µm dose GST activity was 1.07 x 10-11units/cell, and at the 17µm dose it was
calculated to be 2.11 x 10-11units/cell. An average GST activity was also calculated for
each dose. The 11µm dose had an average of 1.09 x 10-11units/cell with a standard
deviation of 6.37 x 10-12. The 17µm dose had an average of 2.07 x 10-11units/cell with a
standard deviation of 4.75 x 10-12. This data can be found in Figure 6. Using an unpaired
2 tail t test, the only statistically significant GST activity increase throughout the study
was the 17µm dose of resveratrol, which is noted by an asterisk in Figure 6.
Doxorubicin Pretreated Cells
Three different doses of doxorubicin cells were administered to the cells before they
were counted and tested for their GST activity. The average change in absorbance for the
2µm doxorubicin sample was 0.003 with a standard deviation of 0.0012, the 4µm sample
was 0.005 with a standard deviation of 0.002, and the 8µm sample was 0.004 with a

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standard deviation of 0.003. This data can be found in Figures 3 and 4. The GST activity
of each dosage was calculated using the GST activity equation and found to be 2.09 x 1012units/cell for the 2µm sample, 2.67 x 10-12units/cell for the 4µm sample, and 4.5 x 1012units/cell for the 8µm sample. This data can be found in Figure 5. An average GST
activity was then calculated for each of the sample doses. The 2µm dose showed an
average of 1.85 x 10-12units/cell with a standard deviation of 8.02 x 10-13. The 4µm
dose showed an average of 2.67 x 10-12units/cell with a standard deviation of 1.41 x 1012. Lastly, the 8µm dose showed an average of 4.88 x 10-12units/cell with a standard
deviation of 3.44 x 10-12. This data can be found in Figure 6.
Doxorubicin Plus Resveratrol Pretreated Cells
The combination of doxorubicin and resveratrol given to cells at different
concentrations, were counted and tested for their GST activity by their change in
absorbance over time. The average change in absorbance for each sample was as follows:
0.005 with a standard deviation of 0.002 for DoxRes 2/11µm sample, 0.010 with a
standard deviation of 0.003 for DoxRes 4/11µm sample, 0.007 with a standard deviation
of 0.004 for the DoxRes 4/17µm sample, and 0.010 with a standard deviation of 0.003 for
the DoxRes 8/17µm sample. This data can be found on Figures 3 and 4. The GST of each
dosage was calculated using the GST activity equation and was found to be as follows:
3.78 x 10-12units/cell for the DoxRes 2/11µm sample, 1.09 x 10-11units/cell for the
DoxRes 4/11µm sample, 5.69 x 10-12units/cell for the DoxRes 4/17µm sample, and
lastly 1.15 x 10-11units/cell for the DoxRes 8/17µm sample. This data can be found in
Figure 5. An average GST activity was also calculated for each of the combined doses.
The DoxRes 2/11µm sample showed an average of 3.53 x 10-12units/cell with a standard

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deviation of 1.57 x 10-12. The DoxRes 4/11µm sample showed an average of 1.09 x 1011units/cell with a standard deviation of 3.91 x 10-12. The DoxRes 4/17µm sample
showed an average of 5.70 x 10-12units/cell with a standard deviation of 3.73 x 10-12.
Finally, the DoxRes 8/17µm sample showed an average of 1.19 x 10-11units/cell with a
standard deviation of 3.68 x 10-12. This data can be found in Figure 6.
Change in absorbance at over 60 seconds
Sample
Control
Res 11µm
Res 17µm
Dox 2 µm
Dox 4 µm
Dox 8 µm
DoxRes 2/11 µm
DoxRes 4/11 µm
DoxRes 4/17 µm
DoxRes 8/17 µm

Culture Dish A
0.018
0.039
0.014
0.002
0.004
0.001
0.004
0.009
0.011
0.008

Culture Dish B
0.006
0.014
0.022
0.004
0.003
0.005
0.007
0.014
0.008
0.009

Culture Dish C
0.007
0.017
0.017
0.002
0.008
0.007
0.003
0.007
0.002
0.014

Figure 3: Change in absorbance at 340 nm over 60 seconds. The effect of resveratrol or
doxorubicin, alone or in combination, on the GST-induced production of dinitrophenyl
thioether, was detected by absorbance at 340 nm. The numbers in the three columns were
produced by extracts from three replicate cell cultures in each of the indicated
treatments. They are not replicate readings of the same sample.

Figure 4: This figure shows average change in absorbance over 60 seconds for the
triplicate culture dishes for each sample and dosage. Averages of the triplicate cultures

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were calculated as well as the standard deviation noted by the black bar on each data
bar.

Figure 5: This figure shows the calculated GST activity in each of the culture dishes
tested for each sample using the GST activity equation noted in the methods and
materials section. Different colors in the graph indicate the different culture dishes noted
in the legend at the top of the graph.

Figure 6: This figure shows the average GST activity per sample and as well as their
standard deviations noted by the black bar on top of each data bar. * Res 17 µm was the
only statistically significant sample found.

Discussion
Resveratrol
The purpose of calculating GST activity for each cell sample and dose was to
determine if GST activity increased due to the resveratrol, doxorubicin, or combination of
the two. The increase in GST activity may represent an indication that resistance to the
chemotherapy drug could be forming. These findings could be used in further studies to

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determine the cause of resistance to doxorubicin specifically. Significant GST Activity
was noted for only resveratrol 17µm, the highest dose of resveratrol administered in this
study. Other notable increases were found in doxorubicin and resveratrol combined doses
as well, but were not statistically significant. Since the doxorubicin and resveratrol
combined samples also showed small amounts of increased GST activity, it provoked
questions to be asked about resveratrol since the doxorubicin samples showed little
increase in activity on their own. This data may indicate that resveratrol has an activating
effect on the GST enzyme even in the presence of doxorubicin. From the GST activity
data, it can be hypothesized that resveratrol may have some inducing or activating effects
on the GST enzyme and therefore consistently showed increases in GST activity in the
samples it was present in.
Although the high dose of resveratrol alone showed activating effects of GST, this
may not be true at other doses. Although resveratrol has shown increased GST at high
doses in this study, it cannot be stated that resveratrol itself will always increase GST
levels. Lower doses of resveratrol must be administered to ovarian cancer cells alongside
a doxorubicin chemotherapy treatment, and GST activity must then be analyzed in order
to make a concluding statement about resveratrol’s effect on GST activity overall.
Previous studies have shown that resveratrol may have inhibitory effects on drug
resistance, while others show that resveratrol may actually aid in resistance to
chemotherapy drugs such as doxorubicin and cisplatin (13). After analyzing our results,
our data seems to show that resveratrol may indeed aid in the formation of resistance to
the chemotherapy drug doxorubicin by ovarian cancer cells using a mechanism of
increased GST levels.

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Doxorubicin
The lowest GST activity was consistently found in the samples of doxorubicin
alone. Interestingly, previous studies of ovarian cancer cells have been found to create
resistance to doxorubicin at doses 2µm and 4µm consistently, therefore the data found in
this study was surprising (14). The low GST activity in each of the doxorubicin samples
may indicate that these ovarian cancer cells are not becoming resistant to doxorubicin
alone. Another possibility could be if there is resistance then it must be by another
mechanism other than GST activity. The mechanism of resistance to doxorubicin is not
always clear, but in order to identify what resistance forming mechanism would be found
in these samples a further study should be done on p-glycoprotein to investigate it as an
alternate pathway of resistance that is common for doxorubicin (15).
Other variable factors
A factor that should be noted in this study is the type of ovarian cancer cell line
used. Ovarian cancer cell line A2780 was purchased and used throughout the study due to
its un-elevated starting GST levels (16). The low starting GST levels of this specific cell
line were important, otherwise the increased GST activity from the resveratrol and other
samples would not have been able to be collected and instead would have been masked
by the cells starting GST levels. The A2780 cell line comes from an ovarian endometroid
adenocarcinoma patient’s untreated tumour. This line specifically is commonly used for
research as a model to test for possible methods of treatment for ovarian cancer. A2780 is
the parent line to the cisplatin resistant cell line A2780 cis (Sigma catalogue no.
93112517) and the adriamycin (doxorubicin) resistant cell line A2780 ADR (Sigma
catalogue no. 93112520) (17).

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Another factor that should be noted in this study is resveratrol’s capability of
increasing GST levels of healthy individual’s when given supplements. According to a
study found, resveratrol has been given an increased amount of attention over the past
two decades because of its abilities to inhibit cancer initiation, promotion, and
progression in preclinical models. Noting these health benefits, researchers wanted to use
healthy participants in a study to be given supplements of resveratrol to compare its
effects on cancer cells to healthy patient cells. Therefore, the polyphenol was studied for
its effects and was found to increase GST levels by 20% in human keratinocyte cells.
These findings coincide with the results found in this study, notwithstanding the fact that
our cells were ovarian cancer cells (18).
Lastly, since resveratrol seemed to consistently show increased GST levels, it
may provoke the question: should cancer patients be advised to stay away from grapes
and red wine. during their chemotherapy treatment. After calculating the dose of
resveratrol in a single grape, we found that one grape is approximately equal to 2000µg
of resveratrol per grape. The dose of resveratrol in this study was only 17µm but when
consuming resveratrol in grapes and wine, they must first be gestated and digested before
having the possibility of entering into the blood stream. At this point, the amount of
resveratrol left over would be little to none. Even though these amounts are overall very
minuscule, in the future it may still be advised that chemotherapy receiving patients stay
away from red wines and grapes during their treatment as a precaution.
Conclusion
The samples of resveratrol alone showed the highest increase in GST activity
alongside the doxorubicin and resveratrol combined samples. treatment or not. The

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change of absorbance and GST activity can only show whether or not GST levels are
increasing, decreasing, or staying the same. Even though increased GST activity
correlates with ovarian cancer cell resistance to doxorubicin, we cannot be certain that
this mechanism of resistance is exclusively creating resistance at this time. The other
mechanisms of resistance may prove to be as responsible for resistance as GST activity in
this study. Further studies of other resistance mechanisms, such as p-gylcoprotein, should
be investigated to determine its effect with resveratrol and doxorubicin resistance.
Acknowledgements
Funding provided by the Department of Biological and Environmental Sciences at
California University of Pennsylvania.
I would like to thank Dr. P. Caffrey for her assistance and guidance throughout the
project.

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