Prostaglandin F-PTGFR signaling promotes proliferation of endometrial epithelial cells of cattle through cell cycle regulation.

There is production of prostaglandin F (PGF) and there is PGF receptor (PTGFR) mRNA transcript in endometrial epithelial cells of cattle. The aims of the present study were to (1) determine whether PGF-PTGFR signaling modulates the proliferation of endometrial epithelial cells and (2) increase knowledge of PGF-PTGFR signaling on the physiological and pharmacological processes in the endometrium of cattle. Amount of cellular proliferation was determined using real-time cell analysis and cell proliferation reagent WST-1 procedures. Abundance of cyclins, cyclin-dependent kinases (CDKs), cyclin-kinase inhibitors, proliferating cell nuclear antigen (PCNA), cyclooxygenase-1 (COX-1), cyclooxygenase-2 (COX-2), PTGFR, epidermal growth factor (EGF) mRNA and protein abundances were evaluated using real-time RT-PCR and western blot analyses. The PGF-PTGFR signaling promoted the proliferation of endometrial epithelial cells by inducing changes in abundance of mRNA transcript and protein that resulted in an increase in the abundance for the cyclins (A, B1, D1, D3), CDKs (1, 2, 4, 6), and PCNA; decrease in abundance for p21; and increase in abundance for EGF, COX-1, COX-2, and PTGFR. There was a direct molecular association between PGF-PTGFR signaling and cell cycle regulation in endometrial epithelial cells of cattle. In addition, findings improve the understanding of PGF-PTGFR signaling in the physiological and pharmacological processes of the endometrium of cattle.