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PMID: 6268923 Published · ppublish English Journal Article Research Support, U.S. Gov't, P.H.S.

Effect of diabetes and insulin replacement on the lipid properties of hepatic smooth endoplasmic reticulum.

Lipids ·Vol. 16 ·No. 7 ·1981-07-00 ·Pages 525-32

Holloway CT, Garfield SA

Abstract

This study is a characterization of the lipid properties of the smooth and rough endoplasmic reticulum (SER, RER) of liver from streptozotocin-induced diabetic rats. A significant decrease in membrane microviscosity was observed in the SER but not the RER of diabetic rats when compared to that of normal controls. This decrease in SER membrane microviscosity correlated with a decrease in cholesterol/phospholipid ratio of these membranes that could be accounted for solely by a change in the membrane cholesterol content. Changes in phospholipid fatty acyl chain composition were also observed in the SER membranes but these changes were small when compared to the large change in cholesterol content observed. Insulin treatment for only one day did not significantly alter the microviscosity of the SER but after 2, 4 and 6 days of treatment both membrane microviscosity and membrane cholesterol content were restored to values similar to those for normal animals. No significant changes in the RER lipid composition were observed. It is well known that increases in glucose-6-Pase (G-6-Pase) activity of liver ER membranes are associated with diabetic onset. An increase in the specific activity of G-6-Pase was observed in both SER and RER membrane preparations, although the observed increase in the SER membrane is higher. The changes in the G-6-Pase activity of the SER membranes were correlated with the alterations in the microviscosity and lipid composition of these membranes. It is postulated that lipid properties of the SER membranes may contribute to the regulation of G-6-Pase activity in that membrane.

MeSH Terms
Animals Cholesterol/analysis Diabetes Mellitus, Experimental/drug therapy,metabolism Endoplasmic Reticulum/metabolism Fatty Acids/analysis Glucose-6-Phosphatase/metabolism Insulin/therapeutic use Lipid Metabolism Lipids/analysis Liver/metabolism Male Phospholipids/analysis Rats Viscosity
Chemicals
Fatty Acids Insulin Lipids Phospholipids Cholesterol Glucose-6-Phosphatase
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Holloway C T
Garfield S A
References (39)
39 references, click to expand
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Article Info
Journal
Lipids
Abbr.
Lipids
ISSN
0024-4201
Published
1981-07-00
Pages
525-32
Language
English
Region
United States
NLM ID
0060450
Subset
IM
Grants
NIADDK NIH HHS · 5P60AM22125 · United States
NIADDK NIH HHS · AM 26873 · United States
NHLBI NIH HHS · HL 19936 · United States
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