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Cited by 564

The DOI matches its Crossref record; 4 of the 4 references it cites were found in a registry or an index.

Disruption of endoplasmic reticulum structure and integrity in lipotoxic cell death

Open access
Borradaile, Nica M., Han, Xianlin, Harp, Jeffrey D., Gale, Sarah E., Ory, Daniel S., Schaffer, Jean E.·2006·Journal of Lipid Research

Abstract

Cell dysfunction and death induced by lipid accumulation in nonadipose tissues, or lipotoxicity, may contribute to the pathogenesis of obesity and type 2 diabetes. However, the mechanisms leading to lipotoxic cell death are poorly understood. We recently reported that, in Chinese hamster ovary (CHO) cells and in H9c2 cardiomyoblasts, lipid overload induced by incubation with 500 muM palmitate leads to intracellular accumulation of reactive oxygen species, which subsequently induce endoplasmic reticulum (ER) stress and cell death. Here, we show that palmitate also impairs ER function through a more direct mechanism. Palmitate was rapidly incorporated into saturated phospholipid and triglyceride species in microsomal membranes of CHO cells. The resulting membrane remodeling was associated with dramatic dilatation of the ER and redistribution of protein-folding chaperones to the cytosol within 5 h, indicating compromised ER membrane integrity. Increasing beta-oxidation, through the activation of AMP-activated protein kinase, decreased palmitate incorporation into microsomes, decreased the escape of chaperones to the cytosol, and decreased subsequent caspase activation and cell death. Thus, palmitate rapidly increases the saturated lipid content of the ER, leading to compromised ER morphology and integrity, suggesting that impairment of the structure and function of this organelle is involved in the cellular response to fatty acid overload.

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Metadata

Authors
Borradaile, N. M., Han, X., Harp, J. D., Gale, S. E., Ory, D. S., & Schaffer, J. E.
Venue
Journal of Lipid Research
Publisher
Elsevier BV
Published
2006-12
Volume
47
Issue
12
Pages
2726-2737
ISSN
0022-2275 (ISSN-L)
OpenAlex
W2099125910
Cited by
564
References
4
FWCI
7.86
Type
journal article
Language
en
Open access
hybrid

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