Partial Disruption of Lipolysis Increases Postexercise Insulin Sensitivity in Skeletal Muscle Despite Accumulation of DAG.

Abstract:

:Type 2 diabetes and skeletal muscle insulin resistance have been linked to accumulation of the intramyocellular lipid-intermediate diacylglycerol (DAG). However, recent animal and human studies have questioned such an association. Given that DAG appears in different stereoisomers and has different reactivity in vitro, we investigated whether the described function of DAGs as mediators of lipid-induced insulin resistance was dependent on the different DAG isomers. We measured insulin-stimulated glucose uptake in hormone-sensitive lipase (HSL) knockout (KO) mice after treadmill exercise to stimulate the accumulation of DAGs in skeletal muscle. We found that, despite an increased DAG content in muscle after exercise in HSL KO mice, the HSL KO mice showed a higher insulin-stimulated glucose uptake postexercise compared with wild-type mice. Further analysis of the chemical structure and cellular localization of DAG in skeletal muscle revealed that HSL KO mice accumulated sn-1,3 DAG and not sn-1,2 DAG. Accordingly, these results highlight the importance of taking the chemical structure and cellular localization of DAG into account when evaluating the role of DAG in lipid-induced insulin resistance in skeletal muscle and that the accumulation of sn-1,3 DAG originating from lipolysis does not inhibit insulin-stimulated glucose uptake.

journal_name

Diabetes

journal_title

Diabetes

authors

Serup AK,Alsted TJ,Jordy AB,Schjerling P,Holm C,Kiens B

doi

10.2337/db16-0655

subject

Has Abstract

pub_date

2016-10-01 00:00:00

pages

2932-42

issue

10

eissn

0012-1797

issn

1939-327X

pii

db16-0655

journal_volume

65

pub_type

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