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Estrogen upregulates hepatic apolipoprotein M expression via the estrogen receptor

Wei, Jiang; Shi, Yuanping; Zhang, Xiaoying; Feng, Yuehua; Luo, Guanghua; Zhang, Jun; Mu, Qinfeng; Tang, Yanhong; Yu, Yang and Pan, Lili, et al. (2011) In Biochimica et Biophysica Acta - Molecular and Cell Biology of Lipids 1811(12). p.1146-1151
Abstract
Apolipoprotein M (apoM) is present predominantly in high-density lipoprotein (HDL) in human plasma, thus possibly involved in the regulation of HDL metabolism and the process of atherosclerosis. Although estrogen replacement therapy increases serum levels of apoAl and HDL, it does not seem to reduce the cardiovascular risk in postmenopausal women. Therefore, we investigated the effects of estrogen on apoM expression in vitro and in vivo. HepG2 cells were incubated with different concentrations of estrogen with or without the estrogen receptor antagonist, fulvestrant, and apoM expression in the cells was determined. Hepatic apoM expression and serum levels of apoM were also determined in normal and in ovariectomized rats treated with either... (More)
Apolipoprotein M (apoM) is present predominantly in high-density lipoprotein (HDL) in human plasma, thus possibly involved in the regulation of HDL metabolism and the process of atherosclerosis. Although estrogen replacement therapy increases serum levels of apoAl and HDL, it does not seem to reduce the cardiovascular risk in postmenopausal women. Therefore, we investigated the effects of estrogen on apoM expression in vitro and in vivo. HepG2 cells were incubated with different concentrations of estrogen with or without the estrogen receptor antagonist, fulvestrant, and apoM expression in the cells was determined. Hepatic apoM expression and serum levels of apoM were also determined in normal and in ovariectomized rats treated with either placebo or estradiol benzoate, using sham operated rats as controls. Estrogen significantly increased mRNA levels of apoM and apoAl in HepG2 cell cultures in a dose- and time-dependent manner; the upregulation of both apolipoproteins was fully abolished by addition of estrogen receptor antagonist In normal rats, estrogen treatment led to an increase in plasma lipid levels including HDL cholesterol, a marked upregulation of apoM mRNA and a significant increase in serum levels of apoM. The same pattern of regulation was found in ovariectomized rats treated with estrogen. Thus, estrogen upregulates apoM expression both in vivo and in vitro by mechanism(s) involving the estrogen receptor. (C) 2011 Elsevier B.V. All rights reserved. (Less)
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published
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keywords
Apolipoprotein M, HDL, Estrogen, Lipid metabolism
in
Biochimica et Biophysica Acta - Molecular and Cell Biology of Lipids
volume
1811
issue
12
pages
1146 - 1151
publisher
Elsevier
external identifiers
  • wos:000298521700017
  • scopus:81755172004
ISSN
1388-1981
DOI
10.1016/j.bbalip.2011.07.003
language
English
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yes
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4950aa5b-3866-48ea-8d12-824134507a6d (old id 2333310)
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2012-02-01 07:38:37
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2017-08-20 04:01:04
@article{4950aa5b-3866-48ea-8d12-824134507a6d,
  abstract     = {Apolipoprotein M (apoM) is present predominantly in high-density lipoprotein (HDL) in human plasma, thus possibly involved in the regulation of HDL metabolism and the process of atherosclerosis. Although estrogen replacement therapy increases serum levels of apoAl and HDL, it does not seem to reduce the cardiovascular risk in postmenopausal women. Therefore, we investigated the effects of estrogen on apoM expression in vitro and in vivo. HepG2 cells were incubated with different concentrations of estrogen with or without the estrogen receptor antagonist, fulvestrant, and apoM expression in the cells was determined. Hepatic apoM expression and serum levels of apoM were also determined in normal and in ovariectomized rats treated with either placebo or estradiol benzoate, using sham operated rats as controls. Estrogen significantly increased mRNA levels of apoM and apoAl in HepG2 cell cultures in a dose- and time-dependent manner; the upregulation of both apolipoproteins was fully abolished by addition of estrogen receptor antagonist In normal rats, estrogen treatment led to an increase in plasma lipid levels including HDL cholesterol, a marked upregulation of apoM mRNA and a significant increase in serum levels of apoM. The same pattern of regulation was found in ovariectomized rats treated with estrogen. Thus, estrogen upregulates apoM expression both in vivo and in vitro by mechanism(s) involving the estrogen receptor. (C) 2011 Elsevier B.V. All rights reserved.},
  author       = {Wei, Jiang and Shi, Yuanping and Zhang, Xiaoying and Feng, Yuehua and Luo, Guanghua and Zhang, Jun and Mu, Qinfeng and Tang, Yanhong and Yu, Yang and Pan, Lili and Nilsson-Ehle, Peter and Xu, Ning},
  issn         = {1388-1981},
  keyword      = {Apolipoprotein M,HDL,Estrogen,Lipid metabolism},
  language     = {eng},
  number       = {12},
  pages        = {1146--1151},
  publisher    = {Elsevier},
  series       = {Biochimica et Biophysica Acta - Molecular and Cell Biology of Lipids},
  title        = {Estrogen upregulates hepatic apolipoprotein M expression via the estrogen receptor},
  url          = {http://dx.doi.org/10.1016/j.bbalip.2011.07.003},
  volume       = {1811},
  year         = {2011},
}