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BOR - Papers in Press, published online ahead of print April 6, 2005.
Biol Reprod 2005, 10.1095/biolreprod.105.040667
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Submitted February 3, 2005
Returned for revision February 28, 2005
Accepted April 5, 2005

Female Reproductive Tract


Dependence of Uterine Cyclooxygenase2 Expression on Luteinizing Hormone Signaling

D. X. Lin , Z. M. Lei , and Ch. V. Rao *

* To whom correspondence should be addressed. E-mail: cvrao001{at}louisville.edu.

Abstract
Several previous studies have demonstrated that uterine Cox2 (also known as Ptgs2) is required for implantation. Luteinizing hormone (LH) released from anterior pituitary gland and human chorionic gonadotropin released from placenta (hCG), can upregulate the uterine Cox2 gene expression. The Lhcgr knockout (herein designated LHRKO) animals have implantation failure even after estradiol and progesterone therapy. These findings led us to investigate the dependence of uterine Cox2 gene expression on LH signaling in LHRKO animals. The results revealed that while Cox2 (also known as Ptgs2) mRNA levels were similar, Cox2 mRNA levels were lower in uterus of null animals than in wild-type siblings. Treatment with hCG did not increase Cox2 mRNA levels in null endometrial stromal or myometrial smooth muscle cells, unless gene therapy was performed to introduce native LHCGR. The Cox2 mRNA levels, on the other hand, did not change regardless of the introduction of native or activated Lhcgr or hCG treatment. The Cox2 mRNA increase paralleled the cAMP raise, suggesting that LH uses the cAMP second messenger system. Treating the wild-type uterine cells with hCG, resulted in a Cox2, but not Cox2 mRNA increase. This increase became exaggerated when additional native LHCGR were introduced by gene therapy. In conclusion, deletion and reinsertion of Lhcgr further support that uterine Cox2 gene expression is dependent on LH signaling.

Key words: Female Reproductive Tract • Cyclic adenosine monophosphate • Gene regulation • Luteinizing hormone • Uterus


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E.A. Campbell, L. O'Hara, R.D. Catalano, A.M. Sharkey, T.C. Freeman, and M. H. Johnson
Temporal expression profiling of the uterine luminal epithelium of the pseudo-pregnant mouse suggests receptivity to the fertilized egg is associated with complex transcriptional changes
Hum. Reprod., October 1, 2006; 21(10): 2495 - 2513.
[Abstract] [Full Text] [PDF]


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