Back to Search
Start Over
Adipose Fatty Acid Binding Protein Promotes Saturated Fatty Acid-Induced Macrophage Cell Death through Enhancing Ceramide Production.
- Source :
-
Journal of immunology (Baltimore, Md. : 1950) [J Immunol] 2017 Jan 15; Vol. 198 (2), pp. 798-807. Date of Electronic Publication: 2016 Dec 05. - Publication Year :
- 2017
-
Abstract
- Macrophages play a critical role in obesity-associated chronic inflammation and disorders. However, the molecular mechanisms underlying the response of macrophages to elevated fatty acids (FAs) and their contribution to metabolic inflammation in obesity remain to be fully elucidated. In this article, we report a new mechanism by which dietary FAs, in particular, saturated FAs (sFAs), are able to directly trigger macrophage cell death. We demonstrated that excess sFAs, but not unsaturated FAs, induced the production of cytotoxic ceramides (Cers) in macrophage cell lines. Most importantly, expression of adipose FA binding protein (A-FABP) in macrophages facilitated metabolism of excess sFAs for Cer synthesis. Inhibition or deficiency of A-FABP in macrophage cell lines decreased sFA-induced Cer production, thereby resulting in reduced cell death. Furthermore, we validated the role of A-FABP in promoting sFA-induced macrophage cell death with primary bone marrow-derived macrophages and high-fat diet-induced obese mice. Altogether, our data reveal that excess dietary sFAs may serve as direct triggers in induction of Cer production and macrophage cell death through elevated expression of A-FABP, thus establishing A-FABP as a new molecular sensor in triggering macrophage-associated sterile inflammation in obesity.<br />Competing Interests: of Potential Conflicts of Interest The authors state no conflict of interest.<br /> (Copyright © 2017 by The American Association of Immunologists, Inc.)
- Subjects :
- Animals
Blotting, Western
Cell Death
Diet, High-Fat
Flow Cytometry
Gene Knockdown Techniques
Macrophages metabolism
Mice
Mice, Inbred C57BL
Mice, Knockout
Microscopy, Confocal
Microscopy, Electron, Transmission
Obesity metabolism
Real-Time Polymerase Chain Reaction
Ceramides biosynthesis
Fatty Acid-Binding Proteins metabolism
Fatty Acids adverse effects
Macrophages pathology
Subjects
Details
- Language :
- English
- ISSN :
- 1550-6606
- Volume :
- 198
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Journal of immunology (Baltimore, Md. : 1950)
- Publication Type :
- Academic Journal
- Accession number :
- 27920274
- Full Text :
- https://doi.org/10.4049/jimmunol.1601403