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Biology of Reproduction, Vol 55, 796-802, Copyright © 1996 by Society for the Study of Reproduction

ARTICLES

Differential expression of beta transforming growth factors (TGF beta 1, TGF beta 2, and TGF beta 3) and their receptors (type I and type II) in peri-implantation porcine conceptuses

A Gupta, FW Bazer and LA Jaeger
Department of Veterinary Anatomy and Public Health, Texas A&M University, College Station 77843, USA.

Beta transforming growth factors (TGF beta 1, TGF beta 2, and TGF beta 3) and type I and II TGF beta receptors were immunohistochemically localized in peri-implantation porcine conceptuses (embryos and associated membranes) collected on Day 10 through Day 14 of gestation. Our results indicate specific immunolocalization of TGF beta isoforms and their receptors in conceptuses during these gestational days. In parietal endoderm, TGF beta 1 immunoreactions were weak to undetectable, TGF beta 2 immunoreactions were intense, and TGF beta 3 immunoreactions were intermediate in intensity to TGF beta 2 and TGF beta 1. In contrast to immunoreactions in endoderm, TGF beta 1 and TGF beta 3 immunostaining in trophectoderm (Tr) was intense. Differences in TGF beta 2 immunostaining of Tr were observed from Days 10 to 14 of gestation. A drastic decrease in cytoplasmic immunostaining of ectoderm and mesoderm was detected from Days 12 to 14 for all TGF beta isoforms and type II receptor; however, type I receptor immunoreactions were consistently detected between Days 10 and 14. Concurrent expression of both type I and type II receptors in the peri-implantation conceptuses suggests that porcine conceptuses are capable of binding and responding to TGF beta s during this period. Differential expression of the three TGF beta isoforms suggests different roles for TGF beta s 1, 2, and 3 in conceptus development. Our results suggest possible roles for TGF beta s in early growth and differentiation of the embryo, differentiation of the Tr, and implantation.


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