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Functional thyrotropin receptor expression in the pituitary folliculo-stellate cell line TtT/GF

Brokken, Leon LU ; Bakker, O; Wiersinga, W M and Prummel, M F (2005) In Experimental and Clinical Endocrinology & Diabetes 113. p.13-20
Abstract
Thyrotropin secretion from the anterior pituitary is regulated mainly through TRH and thyroid hormones. Recent findings of a TSH receptor (TSHR) on folliculo-stellate (FS) cells in the human anterior pituitary indicate that TSH secretion might, in addition, be regulated in a paracrine manner via FS cells. In order to elucidate the physiological relevance of TSHR expression in FS cells we evaluated the effects of TSH on a murine FS cell line, TtT/GF. First, Western blot analysis confirmed the expression of TSHR protein in these cells. Second, three potential second messenger pathways were studied. Last, cDNA array hybridization was used to evaluate the effect of TSH on gene expression levels. TSH failed to induce either the adenylate... (More)
Thyrotropin secretion from the anterior pituitary is regulated mainly through TRH and thyroid hormones. Recent findings of a TSH receptor (TSHR) on folliculo-stellate (FS) cells in the human anterior pituitary indicate that TSH secretion might, in addition, be regulated in a paracrine manner via FS cells. In order to elucidate the physiological relevance of TSHR expression in FS cells we evaluated the effects of TSH on a murine FS cell line, TtT/GF. First, Western blot analysis confirmed the expression of TSHR protein in these cells. Second, three potential second messenger pathways were studied. Last, cDNA array hybridization was used to evaluate the effect of TSH on gene expression levels. TSH failed to induce either the adenylate cyclase/cAMP pathway, the phosphatidylinositol/calcium pathway, or the Janus kinase (JAK)/signal transducer and activator of transcription (STAT) 3 pathway. Most of the genes regulated by TSH were related to cell proliferation, cell differentiation, and apoptosis. Moreover, TSH induced STAT5a and TGFbeta2 expression. We report that TtT/GF cells express a functional TSHR that is not coupled to cAMP nor IP (3) but probably signals through the JAK/STAT5a pathway. Functional TSHR expression in this cell line offers an in vitro model to study the role of TSHR in FS cells. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Experimental and Clinical Endocrinology & Diabetes
volume
113
pages
13 - 20
publisher
Georg Thieme Verlag
external identifiers
  • wos:000227327900003
  • scopus:14644422241
ISSN
1439-3646
DOI
10.1055/s-2004-830516
language
English
LU publication?
no
id
46640234-ce0b-4608-bca5-28dcd6ce470f (old id 1297921)
date added to LUP
2009-07-13 13:37:12
date last changed
2017-07-09 03:35:05
@article{46640234-ce0b-4608-bca5-28dcd6ce470f,
  abstract     = {Thyrotropin secretion from the anterior pituitary is regulated mainly through TRH and thyroid hormones. Recent findings of a TSH receptor (TSHR) on folliculo-stellate (FS) cells in the human anterior pituitary indicate that TSH secretion might, in addition, be regulated in a paracrine manner via FS cells. In order to elucidate the physiological relevance of TSHR expression in FS cells we evaluated the effects of TSH on a murine FS cell line, TtT/GF. First, Western blot analysis confirmed the expression of TSHR protein in these cells. Second, three potential second messenger pathways were studied. Last, cDNA array hybridization was used to evaluate the effect of TSH on gene expression levels. TSH failed to induce either the adenylate cyclase/cAMP pathway, the phosphatidylinositol/calcium pathway, or the Janus kinase (JAK)/signal transducer and activator of transcription (STAT) 3 pathway. Most of the genes regulated by TSH were related to cell proliferation, cell differentiation, and apoptosis. Moreover, TSH induced STAT5a and TGFbeta2 expression. We report that TtT/GF cells express a functional TSHR that is not coupled to cAMP nor IP (3) but probably signals through the JAK/STAT5a pathway. Functional TSHR expression in this cell line offers an in vitro model to study the role of TSHR in FS cells.},
  author       = {Brokken, Leon and Bakker, O and Wiersinga, W M and Prummel, M F},
  issn         = {1439-3646},
  language     = {eng},
  pages        = {13--20},
  publisher    = {Georg Thieme Verlag},
  series       = {Experimental and Clinical Endocrinology & Diabetes},
  title        = {Functional thyrotropin receptor expression in the pituitary folliculo-stellate cell line TtT/GF},
  url          = {http://dx.doi.org/10.1055/s-2004-830516},
  volume       = {113},
  year         = {2005},
}