WNT1 inducible signaling pathway protein 1 (WISP-1/CCN4) is a novel adipokine, which is upregulated in obesity, and induces a pro-inflammatory response in macrophages in-vitro. Preclinical observations suggested WISP-1/CCN4 as a potential candidate for novel obesity therapy targeting adipose tissue inflammation. Whether circulating levels of WISP-1/CCN4 in humans are altered in obesity and/or type 2 diabetes (T2DM) and in the postprandial state, however, is unknown. This study assessed circulating WISP-1/CCN4 levels in a) paired liquid meal tests and hyperinsulinemic- euglycemic clamps (cohort I, n = 26), b) healthy individuals (cohort II, n = 207) and c) individuals with different stages of obesity and glucose tolerance (cohort III, n = 253). Circulating plasma and serum WISP-1/CCN4 concentrations were measured using a commercially available ELISA. WISP-1/CCN4 levels were not influenced by changes in insulin and/or glucose during the tests. In healthy individuals, WISP-1/CCN4 was detectable in 13% of plasma samples with the intraclass correlation coefficient of 0.93 (95% CI: 0.84-0.96) and in 58.1% of the serum samples in cohort III. Circulating WISP-1/CCN4 positively correlated with body mass index, body fat percentage, leptin and triglyceride levels, hip circumference and fatty liver index. No differences in WISP-1/CCN4 levels between individuals with normal glucose tolerance, impaired glucose tolerance and T2DM were found. The circulating concentrations of WISP-1/CCN4 showed no acute regulation in postprandial state and correlated with anthropometrical obesity markers and lipid profiles. In healthy individuals, WISP-1/CCN4 levels are more often below the detection limit. Thus, serum WISP-1/CCN4 levels may be used as a suitable biomarker of obesity.
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| http://dx.doi.org/10.1007/s12079-017-0427-1 | DOI Listing |
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