DPP4 and obesity due to melanocortin 4 receptor deficiency: However, it has also been reported that although deletion of hepatocyte Dpp4 expression abolished the obesity-induced rise in circulating DPP-4 and was associated with reduced levels of proinflammatory cytokines in hepatocytes and adipose tissue, levels of circulating soluble DPP-4 per se did not correlate with tissue or systemic inflammation (82).