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Cited by 508

The DOI matches its Crossref record; 2 of the 2 references it cites were found in a registry or an index.

Suppression of skeletal muscle lipoprotein lipase activity during physical inactivity: a molecular reason to maintain daily low‐intensity activity

Open access
Bey, Lionel, Hamilton, Marc T.·2003·The Journal of Physiology
DOI 10.1113/jphysiol.2003.045591
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Abstract

We have examined the regulation of lipoprotein lipase (LPL) activity in skeletal muscle during physical inactivity in comparison to low‐intensity contractile activity of ambulatory controls. From studies acutely preventing ambulatory activity of one or both the hindlimbs in rats, it was shown that ≈90–95 % of the heparin‐releasable (HR) LPL activity normally present in rat muscle with ambulatory activity is lost, and thus dependent on local contractile activity. Similarly, ≈95 % of the differences in LPL activity between muscles of different fibre types was dependent on ambulatory activity. The robustness of the finding that physical inactivity significantly decreases muscle LPL activity was evident from confirmatory studies with different models of inactivity, in many rats and mice, both sexes, three muscle types and during both acute and chronic (11 days) treatment. Inactivity caused a local reduction of plasma [3 H]triglyceride uptake into muscle and a decrease in high density lipoprotein cholesterol concentration. LPL mRNA was not differentially expressed between ambulatory controls and either the acutely or chronically inactive groups. Instead, the process involved a rapid loss of the HR‐LPL protein mass (the portion of LPL largely associated with the vascular endothelium) by an actinomycin D‐sensitive signalling mechanism (i.e. transcriptionally dependent process). Significant decreases of intracellular LPL protein content lagged behind the loss of HR‐LPL protein. Treadmill walking raised LPL activity ≈8‐fold (P < 0.01) within 4 h after inactivity. The striking sensitivity of muscle LPL to inactivity and low‐intensity contractile activity may provide one piece of the puzzle for why inactivity is a risk factor for metabolic diseases and why even non‐vigorous activity provides marked protection against disorders involving poor lipid metabolism.

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Metadata

Authors
Bey, L., & Hamilton, M. T.
Venue
The Journal of Physiology
Publisher
Wiley
Published
2003-09
Volume
551
Issue
2
Pages
673-682
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
DOI
10.1113/jphysiol.2003.045591
OpenAlex
W2006441443
Cited by
508
References
2
FWCI
1.89
Type
journal article
Language
en
Open access
green

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