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Background:  Obesity is associated with reduced levels of circulating high-density lipoproteins (HDLs) and its major protein, apolipoprotein (apo) A-I. As a result of the role of HDL and apoA-I in cellular lipid transport, low HDL and apoA-I may contribute directly to establishing or maintaining the obese condition.    Methods:  To test this, male C57BL/6 wild-type (WT), apoA-I deficient (apoA-I −/− ) and apoA-I transgenic (apoA-I tg/tg ) mice were fed obesogenic diets (ODs) and monitored for several clinical parameters. We also performed cell culture studies.    Results:  ApoA-I −/−  mice gained significantly more body weight and body fat than WT mice over 20 weeks despite their reduced food intake. During a caloric restriction regime imposed on OD-fed mice, apoA-I deficiency significantly inhibited the loss of body fat as compared with WT mice. Reduced body fat loss with caloric restriction in apoA-I −/−  mice was associated with blunted stimulated adipose tissue lipolysis as verified by decreased levels of phosphorylated hormone-sensitive lipase (p-HSL) and lipolytic enzyme mRNA. In contrast to apoA-I −/−  mice, apoA-I tg/tg  mice gained relatively less weight than WT mice, consistent with other reports. ApoA-I tg/tg  mice showed increased adipose tissue lipolysis, verified by increased levels of p-HSL and lipolytic enzyme mRNA. In cell culture studies, HDL and apoA-I specifically increased catecholamine-induced lipolysis possibly through modulating the adipocyte plasma membrane cholesterol content.    Conclusions:  Thus, apoA-I and HDL contribute to modulating body fat content by controlling the extent of lipolysis. ApoA-I and HDL are key components of lipid metabolism in adipose tissue and constitute new therapeutic targets in obesity.

Modulation of adipose tissue lipolysis and body weight by high-density lipoproteins in mice