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a Departments of Physiology,
b Internal Medicine, and
c Pathology, and
d Reproductive Sciences Program, University of Michigan, Ann Arbor, Michigan 48109
In hypophysectomized rats, prolactin induces regression of the corpora lutea. Luteal regression is accompanied by infiltration of monocytes/macrophages, declines in luteal mass and plasma progestins, and increased staining for monocyte chemoattractant protein-1 (MCP-1). We investigated whether similar events are induced during the estrous cycle, after the proestrous prolactin surge. Rats were killed on proestrus or on estrus, and one ovary was frozen for immunohistochemical detection of MCP-1, monocytes/macrophages (ED1-positive), and differentiated macrophages (ED2-positive) and for in situ detection of apoptotic nuclei. Corpora lutea of the current (proestrus) or preceding (estrus) cycle were dissected from the ovaries of additional rats and frozen for the same analyses and for determination of total protein content. In sections of whole ovaries, intensity and distribution of MCP-1 staining were increased in corpora lutea of multiple ages on estrus as compared to proestrus, as were numbers of differentiated macrophages and apoptotic nuclei per high-power field. Sections of isolated corpora lutea showed these increases on estrus, and the number of monocytes/macrophages per high-power field was also significantly increased. Accompanying these inflammatory/immune events, the corpora lutea on estrus showed decreased weight and total protein per corpus luteum, as compared to corpora lutea on proestrus. These changes are consistent with a proposed role for prolactin in the initiation of luteal apoptosis and of a sequence of inflammatory/immune events that accompany regression of the rat corpus luteum during the normal estrous cycle.
2 Correspondence: J.M. Bowen, Department of Physiology, University of Michigan, 7627 Medical Sciences II Building, Ann Arbor, MI 48109–0622. FAX: 734 936 8813; bowenjm{at}umich.edu
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