Effects of sex steroids on the proliferation of thymic epithelial cells in a culture model: A role of protein kinase C

KOU SAKABE, ISSEI KAWASHIMA, RIE URANO, KANJI SEIKI, Tsunetoshi Itoh

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Using a rat thymic epithelial cell line (TEC; IT‐45R1), the present study attempted to elucidate the mechanism of action of sex steroid hormones (SH) on the proliferation of TEC The findings were as follows: (a) the proliferation of TEC in response to SH was mediated through protein kinase C activity introduced as a result of interaction between SH and plasma‐borne inhibitors; (b) the strong inhibitory effect of SH on TEC proliferation might be mediated through the SH receptor pathway because the proliferative response was triggered by progesterone (P) and androgen (A), whereas the inhibitory response was triggered by P, A and oestrogen. These results clearly suggest that the control of TEC proliferation is a ‘shut‐off’ mechanism triggered by high plasma levels of SH. This further refers to the speculation that the development of the normal thymus may be due to a lack of this ‘shut‐off’ mechanism so that development occurs at the adequate plasma SH levels that are often observed before puberty. However, this development is inhibited at the high plasma SH levels after puberty and/or during pregnancy.

Original languageEnglish
Pages (from-to)193-199
Number of pages7
JournalImmunology and Cell Biology
Volume72
Issue number3
DOIs
Publication statusPublished - 1994 Jan 1

Keywords

  • plasma‐borne inhibitor
  • proliferation
  • protein kinase C
  • sex hormones
  • thymic epithelial cells (TEC)

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Cell Biology

Fingerprint Dive into the research topics of 'Effects of sex steroids on the proliferation of thymic epithelial cells in a culture model: A role of protein kinase C'. Together they form a unique fingerprint.

Cite this