Leukocyte subpopulations in the rat corpus luteum during pregnancy and pseudopregnancy.
Leukocytes including monocyte/macrophages, granulocytes, and T lymphocytes were localized in the corpus luteum (CL) of pregnant and pseudopregnant rats using monoclonal antibodies reactive with lineage-specific antigens. Neutrophilic granulocytes and monocytes/macrophages were found to be the most abundant leukocyte populations in the CL during both pregnancy and pseudopregnancy. The density of neutrophilic granulocytes (MCA 149-reactive cells) increased approximately 2-fold after mating, to peak on Day 9 of pseudopregnancy (214 +/- 13 positive cells/0.125 mm2 grid area) and Day 10 of pregnancy (216 +/- 12/grid area), and then declined in later stages of CL life. In pregnant rats, monocytes/macrophages positive for the monoclonal antibody ED1 were most numerous during early CL life when they were approximately 6-fold more plentiful than at luteolysis (153 +/- 14/grid area at Day 5 vs. 25 +/- 2 at 2 days postpartum). In pseudopregnant rats, the density of ED1-positive cells declined approximately 5-fold during the life span of the CL (124 +/- 17/grid area at Day 2 vs. 20 +/- 2 at Day 13) prior to a second, somewhat lesser peak at luteal regression (84 +/- 12 at Day 15). Fewer monocyte/macrophages within the CL were found to express antigen reactive with the monoclonal antibody ED2, which is characteristically a marker for tissue-macrophages (7% of the density of ED1-positive cells at Day 5 in the pregnant group and 13% at Day 2 in the pseudopregnant group); and while there was an approximately 60% reduction in the number of ED2-positive cells during pregnancy, these cells were found not to fluctuate significantly in number over the course of CL life in pseudopregnant animals.(ABSTRACT TRUNCATED AT 250 WORDS)
Department of Obstetrics and Gynaecology, University of Adelaide, Queen Elizabeth Hospital, Woodville, Australia.
M
M
Brännström
L
L
Giesecke
I C
IC
Moore
C J
CJ
van den Heuvel
S A
SA
Robertson
D000818:Animals; D000911:Antibodies, Monoclonal; D003338:Corpus Luteum / Q000166:cytology*; D005260:Female; D006098:Granulocytes / Q000166:cytology; D000949:Histocompatibility Antigens Class II / Q000032:analysis; D007958:Leukocyte Count; D007962:Leukocytes / Q000166:cytology* / Q000276:immunology; D008264:Macrophages / Q000166:cytology; D008297:Male; D009000:Monocytes / Q000166:cytology; D011247:Pregnancy; D011270:Pregnancy, Animal; D011374:Progesterone / Q000097:blood; D011555:Pseudopregnancy; D051381:Rats; D017207:Rats, Sprague-Dawley; D013601:T-Lymphocytes / Q000166:cytology
D000911:Antibodies, Monoclonal; D000949:Histocompatibility Antigens Class II; D011374:Progesterone