Aim: To identify the correlation between mRNA expression of aromatase, 17β-HSD2 level of TGF-β1 and stage of endometriosis. Methods: Case control study was done on 80 patients divided by 40 endometriosis patients and 40 patients as control. mRNA expression of aromatase, mRNA 17β-SD2, was checked using reverse-transcriptase polymerase chain reaction (RT-PCR) and TGF-β1 serum and peritoneal fluid was checked using ELISA. Result: Level of mRNA aromatase from ectopic and eutopic endometrium increased significantly compared to control group (p < 0.001). mRNA 17β-HSD2 expression is significantly lower compared to control (p < 0.001). Level of TGF-β1 on endometriosis group was significantly higher compared to control group (p < 0.05). Level of peritoneal fluid TGF-β1 on endometriosis group was higher than control group (p < 0.001). There are no correlations between mRNA aromatase, type 2 17β-HSD, TGF-β1 serum level to endometriosis stage. There are significant correlations between peritoneal fluid TGF-β1 levels to endometriosis stage.
Endometriosis is a disease caused by abnormal tissue growth mimicking endometrial tissue which adheres and lives outside the uterus. It’s incidence ranged around 5% - 10% of reproductive age [
Etiopathogenesis of endometriosis has not been fully understood. Many factors are proposed such as genetics and hormonal cause. Risk of acquiring endometriosis increases 7 folds if one of the families acquired endometriosis [
Estrogen is hormone which is known to influence the growth of endometriosis. The strongest estrogenic influence is 17β-estradiol which originates from C19steroid catalyzed by P450 aromatase enzyme. In advance, 17β-estradiol production located in ovarium, but latest study shows that endometriosis tissue also produces it [
mRNA expression or 17β-HSD2 protein almost did not find on endometriosis, but its’ expression was highly found in eutopic endometrium in patient without endometriosis on secretion phase. It is concluded that endometriosis didn’t have mechanism to lower estradiol level [
TGF-β1 is a cytokine that is responsible for endometriosis cycle because it regulates cell cycle and stimulates endometrium stroma cell [
During this study, correlation between mRNA aromatase, 17β-HSD2 level, TGF-β1 level to stage of endometriosis will be discussed further.
Observational analytic and case control study was done to know the correlation between mRNA aromatase, 17β-HSD2 level, TGF-β1 level to stage of endometriosis.
Samples are taken from endometriosis patients and normal endometrium as control. All of the samples are included in inclusion criteria.
Results of the study was inputted in forms for editting, verification and input for further analysis. Data analysis was done using SPSS 13th on Windows. Statistical analysis started with normality test on parametric data (TGF-β1 level, aromatase and type-2 17β-hydroxysteroid dehidrogenase).
Mann-Whitney test was done to compare mRNA aromatase expression, 17βHSD2, andTGF-β if data spreading is abnormal.t-test was done to compare the difference between mRNA aromatase expression, 17βHSD2, and TGF-β if data spreading is normal. Multiple logistic regression was done to manage bias variable.
This study was done in Hasan Sadikin General Hospital during April 2011 until September 2013. 80 cases were divided into 40 control and 40 sample. Analysis on endometriosis tissue, serum and peritoneal fluid was done to analyse aromatase expression, 17β-HSD2, and TGF-β1 level. Specifically on endometriosis group, aromatase and17β-HSD2 was analyzed on ectopic and eutopic tissue, and stage of endometriosis.
First, Kolmogorov-Smirnov test was done to test data normality. When the result is p < 0.05, nonparametric analysis will be used. If the result is p ≥ 0.05, parametric analysis will be used. On normal numerical data distribution, mean, standard deviation, and range will be used. As for abnormal distribution data, only median and ranged will be used. Mann Whitney test was done to independent group and Wilcoxon test will be done to pair groups (
Based on age, most of endometriosis patients are in 35 - 39 years old (n = 21). There are no significant differences between endometriosis group compared to control group (p > 0.05).
Age | Group | p value | |
---|---|---|---|
Endometriosis (n = 40) | Control (n = 40) | ||
0.581 | |||
20 - 34 | 3 (7.5%) | 4 (10%) | |
35 - 39 | 21 (52.5%) | 23 (57.5%) | |
40 - 44 | 16 (40%) | 13 (32.5%) | |
Standard(SD) | 38.35 (3.98) | 37.92 (3.99) | |
Deviation | 27 - 44 | 27 - 44 |
Variable | Group | p value | |
---|---|---|---|
Endometriosis | Control | ||
1. Ectopic mRNA Aromatase expression | n = 40 | n = 40 | <0.001 |
(SD) | 8.09 (1.55) | 2.86 (1.55) | |
2. Eutopic mRNA Aromatase expression | n = 25 | n = 40 | <0.001 |
(SD) | 4.90 (1.21) | 2.86 (1.55) |
Note: Based on unpair T test.
Variable | Group | p Value | |
---|---|---|---|
Endometriosis | Control | ||
1. Ectopic mRNA 17β-HSD2 expression | n = 40 | n = 40 | <0.001 |
Median | 0.21 | 3.07 | |
Range | 0.01 - 0.84 | 1.07 - 10.13 | |
2. Eutopic mRNA 17β-HSD2 expression | n = 25 | n = 40 | <0.001 |
Median | 1.96 | 3.07 | |
Range | 0.49 - 4.13 | 1.07 - 10.13 |
Note: Based on Mann Whitney Test.
TGF-β1serum level (pg/mL) | Group | P value | |
---|---|---|---|
Endometriosis | Control | ||
n = 40 | n = 40 | 0.019*) | |
Standard Deviaton (SD) | 32.300 (8340.50) | 28.000 (6052.58) |
Note: Based on unpaired T Test.
Peritoneal Fluid TGF-β1 level (pg/mL) | Group | p value | |
---|---|---|---|
Endometriosis | Control | ||
n = 40 | n = 40 | <0.001 | |
Median | 574.66 | 288.18 | |
Renting | 154.14 - 1415.97 | 26.16 - 988.84 |
Note: Based on Mann Whitney Test.
Variable | Location | p value | |
---|---|---|---|
Ectopic (n = 40) | Eutopic (n = 25) | ||
1. mRNA Aromatase expression | <0.001*) | ||
Standard Deviation (SD) | 7.58 (1.11) | 4.90 (1.21) | |
2. mRNA 17β-HSD2 expression | <0.001**) | ||
Median | 0.21 | 1.96 | |
Range | 0.04 - 0.52 | 0.49 - 4.13 |
Note: *)Based on paired t test; **)Based on Wilcoxon test.
triosis significantly (p < 0.001). 17β-HSD2expression level is also higher in eutopic endometriosis compared to ectopic endometriosis significantly (p < 0.001).
It was said that endometriosis was derived from endometrium tissue that grow outside the uterus. Growth and development of endometriosis lesion are estrogen-dependent. Estrogen metabolism like aromatase expression and 17β-HSD2 expression have pattern changes either in eutopic or ectopic endometrium in endometriosis patien [
Result of the study shows that aromatase expression in ectopic endometriosis is higher than control group. It shows that endometriosis tissue has the ability to synthesize local estrogen to support lesion development [
On control group endometrium tissue, we found that aromatase expression is very low. It means that endometrium can’t synthesize local estradiol alone. Proliferation on endometrium was thought influenced by peripherall estradiol which mainly comes from ovary and done synergically with ovulatory cycle [
Aromatase expression in eutopic endometrium also found higher than control. It may be caused by endometrium lession that altered peritoneal fluid status [
Variable | Stage | p value*) | |
---|---|---|---|
Mild (n = 10) | Severe (n = 30) | ||
1. Ectopic mRNA Aromatase expression | 0.548 | ||
Median | 7.56 | 7.77 | |
Range | 6.77 - 11.36 | 5.20 - 11.60 | |
2. Ectopic mRNA 17β-HSD2 expression | 0.794 | ||
Median | 0.19 | 0.24 | |
Range | 0.12 - 0.51 | 0.01 - 0.84 | |
3. TGF-β1serum level (pg/mL) | 0.792 | ||
Standard Deviation (SD) | 31,720.76 (7986.10) | 32,537.76 (8578.21) | |
Range | 16,559.26 - 40110.11 | 17,957.35 - 51171.01 | |
4. Peritoneal fluid TGF-β1 level (pg/mL) | < 0.001 | ||
Standard Deviation (SD) | 302.869 (81.891) | 780.083 (301.169) | |
Range | 154.14 - 387.46 | 394.80 - 1415.97 |
Notes: *)Based on Mann-Whitney test (aromatase and17β-HSD2) and t test (TGF-β1 serum and peritoneal fluid).
Correlation of Stage to | Pbi Coefficient | p value |
---|---|---|
1. EctopicmRNA Aromatase expression | 0.040 | 0.807 |
2. EutopicmRNA Aromatase expression | −0.142 | 0.499 |
3. EctopicmRNA 17β-HSD2 expression | 0.041 | 0.80 |
4. EutopicmRNA 17β-HSD2 expression | 0.121 | 0.564 |
5. TGF-β1 serum level | 0.043 | 0.792 |
6. TGF-β1 peritoneal fluid level | 0.623 | <0.001 |
Note: Pbi coefficient = biserial point coefficient correlation.
Variable (Cut off point) | Group | p value | OR | |
---|---|---|---|---|
Endometriosis (n = 40) | Control (n = 40) | (CI 95%) | ||
1. TGF-β1serum level (pg/mL) | <0.001 | 13.632 | ||
>33,352.71 | 21 | 3 | (3.60 - 51.55) | |
≤33,352.71 | 19 | 37 | ||
2. Peritoneal fluid TGF-β1 level (pg/mL) | <0.001 | 11.667 | ||
>336.05 | 35 | 15 | (3.75 - 36.29) | |
≤336.05 | 5 | 25 |
Notes: OR: Odd Ratio, CI: Confidence interval.
Literature said that endometriosis lession can alter peritoenal fluid status. Local estradiol produced by endometriosis tissue that secretes out to peritoneal cavity will cause higher estradiol level in peritoneal fluid on endometriosis patients [
Peritoneal fluid could also enter into uterine cavity which causes exposure to endometrium. Because of that, eutopic endometrium could express higher aromatase level compared to control.
Some theories said that normal endometrium cannot express aromatase [
Aromatase expression in eutopic and ectopic endometrium on endometriosis patient shows differences. Study shows that the difference could be caused by regulation of mRNA aromatase expression such as SF-1. SF-1 expression was found in endometriosis but not in normal endometrium. It is concluded that SF-1 expression was responsible to estrogen production from PGE2 pathway through aromatase promotor gene activation [
Growth and development of endometriosis are estrogen dependent. 17βHSD2 is one of the enzymes predicted to influence estrogen metabolism. 17βHSD2 expression was found higher in control group compared to endometriosis lession. It is concluded that alteration in 17βHSD2 happened endometriosis tissue [
Result of the study shows that difference of TGFβ-1 serum level in endometriosis patients is higher than control. It means that there are potential influence of immunology disturbance and inflammation in endometriosis patients.
Comparison of aromatase expression in mild and severe doesn’t show any difference. It means that there are no correlation between aromatase expression and stage of endometriosis. Same result is applied to correlation of 17βHSD2 expression to stage of endometriosis [
TGFβ-1 level in endometriosis peritoneal fluid is found higher in severe endometriosis compared to mild endometriosis. It shows that there is correlation between peritoneal fluid TGFβ-1 level and stage of endometriosis [
Study limitation in this study is the difficulties to obtain good tissue either eutopic endometrium or control tissue.
Sample collecting for this study requires a long time to complete. It is related to inclusion and exclusion criteria for selection. Most of the patients came to Hasan Sadikin General Hospital diagnosed as severe endometriosis, only few of them diagnosed as mild endometriosis.
Lower mRNA 17β-HSD2 expression in eutopic and ectopic endometrium compared to control group. TGF-β1 serum level found higher in endometriosis group compared to control group. Peritoneal fluid TGF-β1 level found higher in endometriosis group compared to control group. mRNA aromatase expression level, 17β-HSD2 and TGF-β1 level didn’t have correlation to stage of endometriosis, but peritoneal fluid TGF-β1 was correlated to stage of endometriosis.
This study has got ethical approval from Dr. Hasan Sadikin General Hospital Ethical Committee. There was no funding for the preparation of this study. Funding to pay the open access publication charges for this article was provided by researcher.
None declared.
Ruswana Anwar,Firman F. Wirakusumah,Duddy S. Nataprawira,Ani M. Maskoen,Wiryawan Permadi,Tono Djuwantono, (2016) Association between mRNA Expression of Aromatase, 17β-HSD2, Level of TGF-β1 and Stage of Endometriosis. Open Journal of Obstetrics and Gynecology,06,411-418. doi: 10.4236/ojog.2016.67054