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Decidual Cell Function: Evidence for A Role in the Regulation of Serum CBG and A 60Kda Protein During Early Pregnancy in the Hamster

  • Wendell W. Leavitt
  • Sabine Rundle
  • Kevin Thompson
  • Kyle W. Selcer
  • Gary O. Gray
Chapter
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 230)

Summary

Several serum proteins increase in titer during pregnancy. We tested the hypothesis that decidual cells may signal the production of certain serum proteins in the hamster. Measurement of serum CBG by equilibrium binding using either [3H]-progesterone or [3H]-Cortisol in conjection with ion exchange chromatography showed that decidualization increased CBG levels. Two-dimensional gel electrophoresis revealed that a 60Kda protein increases markedly in the serum of the hormonally pseudopregnant (PSP) animal soon after artificial induction of decidualization on PSP day 4. The 60Kda serum protein remains low in the nondecidualized PSP animal, but it increases in the pregnant gnimal. A photoaffinity labeling procedure was used to covalently bind [3H]-androstadienolone to CBG. Fluorography of 2D gels run under denaturing conditions established that the 60Kda protein did not bind steroid as did CBG (69Kda). To determine whether decidual cells could induce the 60Kda and CBG proteins, different numbers of decidual celjLs were injected IP into PSP recipients. A single injection of 50 x 10 decidual cells induced both serum proteins within 48h, whereas the same number of hamster fetal cells was ineffective. Thus, these results demonstrate that hamster decidual cells induce a 60Kda protein of unknown function and serum CBG. Since the decidual cell itself does not appear to be the source of either protein, it follows that the decidual cell signals the synthesis and secretion of these proteins elsewhere in the body, most likely in the liver. To our knowledge, this is the first demonstration that the decidual cell regulates serum CBG and other proteins in this manner.

Keywords

Progesterone Receptor 60Kda Protein Decidual Cell Pregnancy Serum Hamster Embryo Cell 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • Wendell W. Leavitt
    • 1
  • Sabine Rundle
    • 1
  • Kevin Thompson
    • 1
  • Kyle W. Selcer
    • 1
  • Gary O. Gray
    • 1
  1. 1.Department of BiochemistryTexas Tech University Health Sciences CenterLubbockUSA

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