Endometrial Expression of Homeobox Genes and Cell Adhesion Molecules in Infertile Women With Intramural Fibroids During Window of Implantation

In: Reproductive Sciences · 2016 · vol. 24(3) , pp. 435–444 · doi:10.1177/1933719116657196 · PMID:27407137 · W2474950575
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Infertile women with intramural fibroids showed reduced HOXA10 and E-cadherin mRNA and protein levels during the window of implantation compared to fertile controls.

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This study examined HOXA10 and HOXA11 homeobox gene expression and the cell adhesion molecules E-cadherin, N-cadherin, and β-catenin in endometrial tissue collected during the window of implantation from infertile women with noncavity-distorting intramural fibroids (n=18) and fertile controls (n=12), using qRT-PCR and immunohistochemistry. Compared with controls, infertile patients showed reduced HOXA10 and HOXA11 transcript and protein levels, with only HOXA10 mRNA and stromal protein changes reaching statistical significance, and significantly lower E-cadherin mRNA and protein with reduced E-cadherin staining in luminal and glandular epithelium. N-cadherin and β-catenin showed no significant differences in expression, though downward trends were noted. The authors conclude that altered mid-secretory HOXA10 and E-cadherin expression in intramural fibroids may impair endometrial receptivity, but the study’s limited sample size and mostly non-significant HOXA11 and adhesion marker trends constrain interpretability. This paper relates to endometriosis in that it discusses shared molecular receptivity pathways (HOX genes and E-cadherin/β-catenin) that are also reported to be dysregulated in endometriosis-associated infertility, including prior findings cited by the authors.

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Abstract

This study was designed to examine the expression and cellular distribution of homeobox ( HOX) genes ( HOXA10 and HOXA11) and cell adhesion molecules (E-cadherin, N-cadherin, and β-catenin) during the window of implantation in infertile women with noncavity-distorting intramural (IM) fibroids (n = 18) and in fertile controls (n = 12). Quantitative real-time polymerase chain reaction and immunohistochemistry were used to evaluate the messenger RNA (mRNA) levels and protein expression, respectively. When compared to fertile controls, reduced HOXA10 and HOXA11 transcript and protein levels were observed in infertile women. However, changes only in the expression of HOXA10 mRNA (-1.72-fold; P = .03) and stromal protein ( P = .001) were statistically significant. Significantly lower E-cadherin mRNA (-10.97-fold; P = .02) and protein levels were seen in infertile patients. E-cadherin immunostaining was significantly reduced both in the luminal ( P = .048) and in the glandular ( P = .014) epithelium of endometrium from infertile patients when compared to controls. No significant change was observed either in the mRNA levels or in the immunoexpression of N-cadherin and β-catenin. However, a trend toward lower N-cadherin expression in the luminal epithelium ( P = .054) and decreased β-catenin expression in the glandular epithelium ( P = .070) was observed in infertile patients. The present findings suggest that altered endometrial HOXA10 and E-cadherin mRNA and protein expression observed in infertile women with IM fibroids during the mid-secretory phase might impair endometrial receptivity leading to infertility in these patients.
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Abstract

This study was designed to examine the expression and cellular distribution of homeobox (HOX) genes (HOXA10 and HOXA11) and cell adhesion molecules (E-cadherin, N-cadherin, and β-catenin) during the window of implantation in infertile women with noncavity-distorting intramural (IM) fibroids (n = 18) and in fertile controls (n = 12). Quantitative real-time polymerase chain reaction and immunohistochemistry were used to evaluate the messenger RNA (mRNA) levels and protein expression, respectively. When compared to fertile controls, reduced HOXA10 and HOXA11 transcript and protein levels were observed in infertile women. However, changes only in the expression of HOXA10 mRNA (-1.72-fold; P =.03) and stromal protein (P =.001) were statistically significant. Significantly lower E-cadherin mRNA (-10.97-fold; P =.02) and protein levels were seen in infertile patients. E-cadherin immunostaining was significantly reduced both in the luminal (P =.048) and in the glandular (P =.014) epithelium of endometrium from infertile patients when compared to controls. No significant change was observed either in the mRNA levels or in the immunoexpression of N-cadherin and β-catenin. However, a trend toward lower N-cadherin expression in the luminal epithelium (P =.054) and decreased β-catenin expression in the glandular epithelium (P =.070) was observed in infertile patients. The present findings suggest that altered endometrial HOXA10 and E-cadherin mRNA and protein expression observed in infertile women with IM fibroids during the mid-secretory phase might impair endometrial receptivity leading to infertility in these patients. Similar content being viewed by others

References

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