Luteal prostaglandin F2α:: New concepts of prostaglandin F2α secretion and its actions within the bovine corpus luteum -: Review

The corpus luteum (CL) is a temporary endocrine gland whose main function is to secrete progesterone to support pregnancy. On the other hand, the cyclic bovine CL has also been shown to be a site of prostaglandin F-2 alpha (PGF(2 alpha)) production. Although there is general agreement that endometrial PGF(2 alpha) is an essential luteolysin in cattle, luteal PGF(2 alpha) seems to play a luteotropic role as an autocrine and/or paracrine factor, especially for the development and maintenance of the CL. This supposition is based on evidence that some of the prerequisites For autocrine/paracrine mechanisms are present, including local production of PGF(2 alpha) and the existence of specific binding sites within the CL. The purpose of this paper is to review the regulation of luteal PGF(2 alpha) secretion, its action on CL as an autocrine and/or paracrine factor and the receptivity of bovine CL to PGF(2 alpha).