Apolipoprotein A5 deficiency aggravates high-fat diet-induced obesity due to impaired central regulation of food intake.

Abstract

Mutations in apolipoprotein A5 (APOA5) have been associated with hypertriglyceridemia in humans and mice. This has been attributed to a stimulating role for APOA5 in lipoprotein lipase-mediated triglyceride hydrolysis and hepatic clearance of lipoprotein remnant particles. However, because of the low APOA5 plasma abundance, we investigated an additional signaling role for APOA5 in high-fat diet (HFD)-induced obesity. Wild-type (WT) and Apoa5(-/-) mice fed a chow diet showed no difference in body weight or 24-h food intake (Apoa5(-/-), 4.5±0.6 g; WT, 4.2±0.5 g), while Apoa5(-/-) mice fed an HFD ate more in 24 h (Apoa5(-/-), 2.8±0.4 g; WT, 2.5±0.3 g, P<0.05) and became more obese than WT mice. Also, intravenous injection of APOA5-loaded VLDL-like particles lowered food intake (VLDL control, 0.26±0.04 g; VLDL+APOA5, 0.11±0.07 g, P<0.01). In addition, the HFD-induced hyperphagia of Apoa5(-/-) mice was prevented by adenovirus-mediated hepatic overexpression of APOA5. Finally, intracerebroventricular injection of APOA5 reduced food intake compared to injection of the same mouse with artificial cerebral spinal fluid (0.40±0.11 g; APOA5, 0.23±0.08 g, P<0.01). These data indicate that the increased HFD-induced obesity of Apoa5(-/-) mice as compared to WT mice is at least partly explained by hyperphagia and that APOA5 plays a role in the central regulation of food intake.

• Authors: Sjoerd A A van den Berg, Mattijs M Heemskerk, Janine J Geerling, Jan-Bert van Klinken, Frank G Schaap, Silvia Bijland, Jimmy F P Berbée, Vanessa J A van Harmelen, Amanda C M Pronk, Marijke Schreurs, Louis M Havekes, Patrick C N Rensen, Ko Willems van Dijk
• Journal: FASEB journal : official publication of the Federation of American Societies for Experimental Biology (FASEB J) Vol. 27 Issue 8 Pg. 3354-62 (Aug 2013) ISSN: 1530-6860 [Electronic] United States
• PMID: 23650188 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Apoa5 protein, mouse
• Apolipoprotein A-V
• Apolipoproteins
• Lipids

Topics

• Animals
• Apolipoprotein A-V
• Apolipoproteins (administration & dosage, deficiency, genetics)
• Calorimetry
• Diet, High-Fat (adverse effects)
• Eating (drug effects, genetics, physiology)
• Fatty Liver (genetics, metabolism)
• Hyperlipidemias (etiology, genetics, metabolism)
• Hyperphagia (etiology, genetics, metabolism)
• Injections, Intravenous
• Injections, Intraventricular
• Insulin Resistance (genetics, physiology)
• Lipids (blood)
• Male
• Mice
• Mice, Inbred C57BL
• Mice, Knockout
• Obesity (etiology, genetics, physiopathology)