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Phospholipid fatty acid pattern and D-glucose metabolism in muscles from omega3 fatty acid-depleted rats.

Abstract：

:A depletion in long-chain polyunsaturated omega3 fatty acids may affect fuel homeostasis. In such a perspective, the present study deals mainly with the in vitro fate of D-[U-(14)C]glucose in hemidiaphragms, stretched soleus and plantaris muscle pieces obtained from normal and omega3-depleted rats (second generation) and incubated in the absence or presence of insulin. When so required, the omega3-depleted rats were injected 120 min before sacrifice with either a omega3 fatty acid-rich medium-chain triglyceride:fish oil emulsion (FO) or a control medium-chain triglyceride:olive oil emulsion (OO). The content of the soleus muscle in long-chain polyunsaturated omega3 fatty acids was severely decreased in the omega3-depleted rats, and modestly albeit significantly increased after injection of FO to these animals. In stretched soleus muscles from OO-injected omega3-depleted rats, the absolute values for glycogen synthesis measured in the absence or presence of insulin were about twice higher than in normal animals. In the OO-injected omega3-depleted rats, insulin augmented the output of (14)C-labelled amino acids, whilst such was not the case in normal animals. These and other findings suggest a lower catabolism of D-glucose relative to the anabolic process of glycogen synthesis and a lower availability of endogenous amino acids in the muscles of omega3-depleted rats, as compared to those of control animals. The prior injection of FO to the omega3-depleted rats restored a normal value for the paired ratio between the output of (14)C-labelled amino acids and acidic metabolites, but further increased glycogen net synthesis. It is proposed, therefore, that the perturbation of d-glucose metabolism in muscles from omega3-depleted rats involves a multifactorial determinism, only some of the concerned factors being susceptible to rapid correction after enrichment of cell phospholipids in long-chain polyunsaturated omega3 fatty acids.

journal_name

Biochimie

journal_title

Biochimie

authors

Agascioglu E,Zhang Y,Sener A,Portois L,Chardigny JM,Malaisse WJ,Carpentier YA

doi

10.1016/j.biochi.2006.10.004

subject

Has Abstract

pub_date

2007-03-01 00:00:00

pages

374-82

issue

3

eissn

0300-9084

issn

1638-6183

pii

S0300-9084(06)00237-9

journal_volume

89

pub_type

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