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Kidney triglyceride accumulation in the fasted mouse is dependent upon serum free fatty acids[S]

Authors :
Diego Scerbo
Ni-Huiping Son
Alaa Sirwi
Lixia Zeng
Kelli M. Sas
Vincenza Cifarelli
Gabriele Schoiswohl
Lesley-Ann Huggins
Namrata Gumaste
Yunying Hu
Subramaniam Pennathur
Nada A. Abumrad
Erin E. Kershaw
M. Mahmood Hussain
Katalin Susztak
Ira J. Goldberg
Source :
Journal of Lipid Research, Vol 58, Iss 6, Pp 1132-1142 (2017)
Publication Year :
2017
Publisher :
Elsevier, 2017.

Abstract

Lipid accumulation is a pathological feature of every type of kidney injury. Despite this striking histological feature, physiological accumulation of lipids in the kidney is poorly understood. We studied whether the accumulation of lipids in the fasted kidney are derived from lipoproteins or NEFAs. With overnight fasting, kidneys accumulated triglyceride, but had reduced levels of ceramide and glycosphingolipid species. Fasting led to a nearly 5-fold increase in kidney uptake of plasma [14C]oleic acid. Increasing circulating NEFAs using a β adrenergic receptor agonist caused a 15-fold greater accumulation of lipid in the kidney, while mice with reduced NEFAs due to adipose tissue deficiency of adipose triglyceride lipase had reduced triglycerides. Cluster of differentiation (Cd)36 mRNA increased 2-fold, and angiopoietin-like 4 (Angptl4), an LPL inhibitor, increased 10-fold. Fasting-induced kidney lipid accumulation was not affected by inhibition of LPL with poloxamer 407 or by use of mice with induced genetic LPL deletion. Despite the increase in CD36 expression with fasting, genetic loss of CD36 did not alter fatty acid uptake or triglyceride accumulation. Our data demonstrate that fasting-induced triglyceride accumulation in the kidney correlates with the plasma concentrations of NEFAs, but is not due to uptake of lipoprotein lipids and does not involve the fatty acid transporter, CD36.

Details

Language :
English
ISSN :
00222275
Volume :
58
Issue :
6
Database :
Directory of Open Access Journals
Journal :
Journal of Lipid Research
Publication Type :
Academic Journal
Accession number :
edsdoj.51e7cf5d85b4f879916ea986c8be5a9
Document Type :
article
Full Text :
https://doi.org/10.1194/jlr.M074427