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Related Experiment Videos

Type beta transforming growth factor affects adrenocortical cell-differentiated functions.

J J Feige1, C Cochet, W E Rainey

  • 1Laboratoire de Biochimie des Régulations Cellulaires Endocrines, Unité Institut National de la Santé et de la Recherche Médicale 244, Grenoble, France.

The Journal of Biological Chemistry
|October 5, 1987
PubMed
Summary

Transforming growth factor-beta (TGF-beta) significantly alters bovine adrenocortical cell functions by inhibiting cortisol production and 17 alpha-hydroxylase activity. TGF-beta also reduces angiotensin II receptor number and signaling, impacting steroidogenesis.

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Area of Science:

  • Endocrinology
  • Cell Biology
  • Biochemistry

Background:

  • Adrenocortical cells produce steroid hormones crucial for physiological functions.
  • Transforming growth factor-beta (TGF-beta) is a cytokine with diverse cellular effects.
  • The role of TGF-beta in regulating adrenocortical cell differentiated functions is not fully understood.

Purpose of the Study:

  • To investigate the effects of TGF-beta on mitogenic and steroidogenic activities of bovine adrenocortical cells.
  • To identify specific molecular targets regulated by TGF-beta in adrenocortical cells.

Main Methods:

  • Primary bovine adrenocortical cells were cultured in vitro.
  • Cells were treated with TGF-beta (1 ng/ml).
  • Mitogenic activity, steroid production, cAMP accumulation, enzyme activities (17 alpha-hydroxylase), receptor binding, and signaling pathways were analyzed using techniques including HPLC and radioligand binding assays.

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Main Results:

  • TGF-beta did not affect mitogenic activity but significantly altered steroidogenesis.
  • Cortisol production was inhibited by 50-60% basally and upon ACTH stimulation.
  • A 50% reduction in 17 alpha-hydroxylase activity was observed, shifting steroid secretion patterns.
  • TGF-beta decreased angiotensin II receptor number by 50% and inhibited angiotensin II-activated cortisol production by 70-90% and phosphoinositide breakdown.

Conclusions:

  • TGF-beta is a potent negative modulator of differentiated bovine adrenocortical cell functions in vitro.
  • Key targets include 17 alpha-hydroxylase activity and the angiotensin II signaling pathway.
  • Further research is needed to elucidate the in vivo mechanisms and physiological relevance of TGF-beta in adrenocortical gland regulation.