Advanced

Identification of functional prolactin (PRL) receptor gene expression: PRL inhibits lipoprotein lipase activity in human white adipose tissue

Ling, Charlotte LU ; Svensson, Louise; Oden, Birgitta; Weijdegard, Birgitta; Eden, Barbro; Eden, Staffan and Billig, Hakan (2003) In Journal of Clinical Endocrinology and Metabolism 88(4). p.1804-1808
Abstract
During lactation serum levels of prolactin (PRL) are elevated, and the activity of lipoprotein lipase (LPL) is decreased in the adipose tissue and increased in the mammary gland. However, PRL has been suggested to affect the adipose tissue in an indirect fashion during lactation. In the present study, we demonstrated expression of four PRL receptor (PRLR) mRNA isoforms (L, I, S1(a), and S1(b)) in human sc abdominal adipose tissue and breast adipose tissue using RT-PCR/Southern blot analysis. In addition, L-PRLR [relative molecular mass (M(r)) 90,000] and I-PRLR (M(r) 50,000) protein expression was detected in human sc abdominal adipose tissue and breast adipose tissue using immunoblot analysis. Two additional protein bands with the... (More)
During lactation serum levels of prolactin (PRL) are elevated, and the activity of lipoprotein lipase (LPL) is decreased in the adipose tissue and increased in the mammary gland. However, PRL has been suggested to affect the adipose tissue in an indirect fashion during lactation. In the present study, we demonstrated expression of four PRL receptor (PRLR) mRNA isoforms (L, I, S1(a), and S1(b)) in human sc abdominal adipose tissue and breast adipose tissue using RT-PCR/Southern blot analysis. In addition, L-PRLR [relative molecular mass (M(r)) 90,000] and I-PRLR (M(r) 50,000) protein expression was detected in human sc abdominal adipose tissue and breast adipose tissue using immunoblot analysis. Two additional protein bands with the molecular weight M(r) 40-35,000 were also detected. The direct effect of PRL on the regulation of LPL activity in human abdominal adipose tissue cultured in vitro was investigated. PRL (500 ng/ml) reduced the LPL activity in human adipose tissue to 31 +/- 7.7%, compared with control. GH (100 ng/ml) also reduced the LPL activity, to 45 +/- 8.6%, compared with control. In agreement with previous studies, cortisol increased the LPL activity and GH inhibited cortisol-induced LPL activity. Furthermore, we found that PRL also inhibited the cortisol-induced LPL activity. Taken together, these results demonstrate a direct effect of PRL, via functional PRLRs, in reducing the LPL activity in human adipose tissue, and these results suggest that LPL might also be regulated in this fashion during lactation. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Clinical Endocrinology and Metabolism
volume
88
issue
4
pages
1804 - 1808
publisher
The Endocrine Society
external identifiers
  • pmid:12679477
  • scopus:0037683665
ISSN
1945-7197
DOI
10.1210/jc.2002-021137
language
English
LU publication?
yes
id
13ace879-225b-4deb-980c-fecaacd73b1f (old id 1126240)
date added to LUP
2008-06-12 09:00:41
date last changed
2018-01-07 08:49:34
@article{13ace879-225b-4deb-980c-fecaacd73b1f,
  abstract     = {During lactation serum levels of prolactin (PRL) are elevated, and the activity of lipoprotein lipase (LPL) is decreased in the adipose tissue and increased in the mammary gland. However, PRL has been suggested to affect the adipose tissue in an indirect fashion during lactation. In the present study, we demonstrated expression of four PRL receptor (PRLR) mRNA isoforms (L, I, S1(a), and S1(b)) in human sc abdominal adipose tissue and breast adipose tissue using RT-PCR/Southern blot analysis. In addition, L-PRLR [relative molecular mass (M(r)) 90,000] and I-PRLR (M(r) 50,000) protein expression was detected in human sc abdominal adipose tissue and breast adipose tissue using immunoblot analysis. Two additional protein bands with the molecular weight M(r) 40-35,000 were also detected. The direct effect of PRL on the regulation of LPL activity in human abdominal adipose tissue cultured in vitro was investigated. PRL (500 ng/ml) reduced the LPL activity in human adipose tissue to 31 +/- 7.7%, compared with control. GH (100 ng/ml) also reduced the LPL activity, to 45 +/- 8.6%, compared with control. In agreement with previous studies, cortisol increased the LPL activity and GH inhibited cortisol-induced LPL activity. Furthermore, we found that PRL also inhibited the cortisol-induced LPL activity. Taken together, these results demonstrate a direct effect of PRL, via functional PRLRs, in reducing the LPL activity in human adipose tissue, and these results suggest that LPL might also be regulated in this fashion during lactation.},
  author       = {Ling, Charlotte and Svensson, Louise and Oden, Birgitta and Weijdegard, Birgitta and Eden, Barbro and Eden, Staffan and Billig, Hakan},
  issn         = {1945-7197},
  language     = {eng},
  number       = {4},
  pages        = {1804--1808},
  publisher    = {The Endocrine Society},
  series       = {Journal of Clinical Endocrinology and Metabolism},
  title        = {Identification of functional prolactin (PRL) receptor gene expression: PRL inhibits lipoprotein lipase activity in human white adipose tissue},
  url          = {http://dx.doi.org/10.1210/jc.2002-021137},
  volume       = {88},
  year         = {2003},
}