Abstract
Hox genes are well-known transcriptional regulators that play an essential role in directing embryonic development. Mice that are homozygous for a targeted disruption of the Hoxa10 gene exhibit uterine factor infertility. We have recently demonstrated that HOXA10 is expressed in the adult human uterus. To examine expression of HOXA10 during the menstrual cycle, Northern blot analysis and in situ hybridization were performed. Expression of HOXA10 dramatically increased during the midsecretory phase of the menstrual cycle, corresponding to the time of implantation and increase in circulating progesterone. Expression of HOXA10 in cultured endometrial cells was stimulated by estrogen or progesterone. Stimulation of HOXA10 by progesterone was concentration-dependent within the physiologic range, and the effect of estrogen was inhibited by cycloheximide. These results identify sex steroids as novel regulators of HOX gene expression. HOXA10 may have an important function in regulating endometrial development during the menstrual cycle and in establishing conditions necessary for implantation in the human.
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Selected References
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