Molecular mechanisms regulating hormone-sensitive lipase and lipolysis.
(2003) In Biochemical Society Transactions 31(Pt 6). p.1120-1124- Abstract
- HSL (hormone-sensitive lipase) is a key enzyme in the mobilization of fatty acids from acylglycerols in adipocytes as well as non-adipocytes. In adipocytes, catecholamines stimulate lipolysis mainly through PKA (protein kinase A)-mediated phosphorylation of HSL and perilipin, a protein coating the lipid droplet. The anti-lipolytic action of insulin is mediated mainly via lowered cAMP levels, accomplished through activation of phosphodiesterase 3B. Phosphorylation of HSL by PKA occurs at three sites, the serines 563, 659 and 660, both in vitro and in primary rat adipocytes. Phosphorylation of Ser-659 and -660 is required for in vitro activation as well as translocation from the cytosol to the lipid droplet, whereas the role of the third PKA... (More)
- HSL (hormone-sensitive lipase) is a key enzyme in the mobilization of fatty acids from acylglycerols in adipocytes as well as non-adipocytes. In adipocytes, catecholamines stimulate lipolysis mainly through PKA (protein kinase A)-mediated phosphorylation of HSL and perilipin, a protein coating the lipid droplet. The anti-lipolytic action of insulin is mediated mainly via lowered cAMP levels, accomplished through activation of phosphodiesterase 3B. Phosphorylation of HSL by PKA occurs at three sites, the serines 563, 659 and 660, both in vitro and in primary rat adipocytes. Phosphorylation of Ser-659 and -660 is required for in vitro activation as well as translocation from the cytosol to the lipid droplet, whereas the role of the third PKA site remains elusive. Adipocytes isolated from homozygous HSL-null mice, generated in our laboratory, exhibit completely blunted catecholamine-induced glycerol release and reduced fatty acid release, suggesting the presence of additional, although not necessarily hormone-activatable, triacylglycerol lipase(s). Basal hyperinsulinaemia, release of exaggerated amounts of insulin during glucose challenges and retarded glucose disposal during insulin tolerance tests suggest that HSL-null mice are insulin resistant. Liver, adipose tissue and skeletal muscle appear all to be sites of impaired insulin sensitivity in HSL-null mice. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/119896
- author
- Holm, Cecilia LU
- organization
- publishing date
- 2003
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- adipose tissue, cholesteryl ester hydrolase, insulin resistance, perilipin, protein kinase A
- in
- Biochemical Society Transactions
- volume
- 31
- issue
- Pt 6
- pages
- 1120 - 1124
- publisher
- Biochemical Society
- external identifiers
-
- wos:000187289000004
- pmid:14641008
- scopus:0348049843
- ISSN
- 0300-5127
- language
- English
- LU publication?
- yes
- id
- 183d4c70-d3e4-43d2-b72e-a82a47a2be20 (old id 119896)
- alternative location
- http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14641008&dopt=Abstract
- date added to LUP
- 2016-04-01 11:46:36
- date last changed
- 2022-03-28 02:53:40
@article{183d4c70-d3e4-43d2-b72e-a82a47a2be20,
abstract = {{HSL (hormone-sensitive lipase) is a key enzyme in the mobilization of fatty acids from acylglycerols in adipocytes as well as non-adipocytes. In adipocytes, catecholamines stimulate lipolysis mainly through PKA (protein kinase A)-mediated phosphorylation of HSL and perilipin, a protein coating the lipid droplet. The anti-lipolytic action of insulin is mediated mainly via lowered cAMP levels, accomplished through activation of phosphodiesterase 3B. Phosphorylation of HSL by PKA occurs at three sites, the serines 563, 659 and 660, both in vitro and in primary rat adipocytes. Phosphorylation of Ser-659 and -660 is required for in vitro activation as well as translocation from the cytosol to the lipid droplet, whereas the role of the third PKA site remains elusive. Adipocytes isolated from homozygous HSL-null mice, generated in our laboratory, exhibit completely blunted catecholamine-induced glycerol release and reduced fatty acid release, suggesting the presence of additional, although not necessarily hormone-activatable, triacylglycerol lipase(s). Basal hyperinsulinaemia, release of exaggerated amounts of insulin during glucose challenges and retarded glucose disposal during insulin tolerance tests suggest that HSL-null mice are insulin resistant. Liver, adipose tissue and skeletal muscle appear all to be sites of impaired insulin sensitivity in HSL-null mice.}},
author = {{Holm, Cecilia}},
issn = {{0300-5127}},
keywords = {{adipose tissue; cholesteryl ester hydrolase; insulin resistance; perilipin; protein kinase A}},
language = {{eng}},
number = {{Pt 6}},
pages = {{1120--1124}},
publisher = {{Biochemical Society}},
series = {{Biochemical Society Transactions}},
title = {{Molecular mechanisms regulating hormone-sensitive lipase and lipolysis.}},
url = {{http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=14641008&dopt=Abstract}},
volume = {{31}},
year = {{2003}},
}