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Biology of Reproduction, Vol 45, 811-817, Copyright © 1991 by Society for the Study of Reproduction

ARTICLES

Assessment of expression of the receptor for colony-stimulating factor- 1 (fms) in bovine trophoblast

JL Beauchamp and BA Croy
Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, Canada.

Bovine trophoblast was employed to assess the questions of whether the receptor for CSF-1 is expressed by noninvasive trophoblast and whether expression changes with differentiation within placentomes. Bovine placental poly(A) mRNA contained sequences cross-reactive with cDNA probes to c-fms and v-fms. Using a monoclonal antibody to v-fms, immunohistochemistry of postattachment bovine trophoblast showed expression of an fms-like protein between Day 29 and term. Expression occurred in both the intercotyledonary and cotyledonary trophoblast. Reactivity that was fms-like was also demonstrated on preattachment conceptuses flushed at Days 14 and 7 of gestation and on Day 7 embryos derived from in vitro oocyte maturation and fertilization. Unexpectedly, in the second half of pregnancy some cells, including binucleate cells, showed nuclear rather than cytoplasmic reactivity to the antibody. These data indicate expression of an fms-like protein in bovine placenta that does not correlate with properties of trophoblast cell invasiveness or major morphological differentiation. The data do support a universal role for this protein during mammalian placental development.


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Copyright © 1991 by the Society for the Study of Reproduction.