Localization and regulation of the activin-A dimer in human placental cells

Jaron Rabinovici, Paul C. Goldsmith, Cliff L. Librach, Robert B. Jaffe*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Subunits of activin and inhibin and their mRNAs are present in human placental and decidual cells. However, evidence for the presence of intact activin dimers in the human placenta and their regulation has been lacking. Using a monoclonal antibody raised against the human activin-A dimer, we examined the cellular localization of immunoreactive activin-A dimer in human placentas of different gestational ages (8-41 weeks). In addition, we determined the effects of culture and various potential regulators on the cellular accumulation of immunoreactive activin-A dimer in trophoblast cells from human first trimester placentas. Activin-A dimer was found in both cyto- and syncytiotrophoblast cells of all gestational ages studied. Immunoreactive activin-A also was detected in placental Hofbauer cells in first and second trimester placentas as well as in cells of the placental membranes. Exposure of these cells to cAMP, GnRH, activin, inhibin, transforming growth factor-β, dexamethasone, and interleukin-1 did not significantly change the intensity of immunostaining for activin-A dimer. These results together with previous data suggest that placental cells are a source of activin-A and that activin-A may be a paracrine and/or endocrine regulator of feto-maternal interactions during pregnancy.

Original languageEnglish
Pages (from-to)571-576
Number of pages6
JournalJournal of Clinical Endocrinology and Metabolism
Issue number2
StatePublished - Aug 1992
Externally publishedYes


Dive into the research topics of 'Localization and regulation of the activin-A dimer in human placental cells'. Together they form a unique fingerprint.

Cite this