Classical and alternate complement factor overexpression in non-obese weight matched women with polycystic ovary syndrome does not correlate with vitamin D

IntroductionWomen with polycystic ovary syndrome (PCOS) exhibit complement factor expression changes that may be obesity-driven rather than an intrinsic facet of PCOS; furthermore, complement changes have been associated with vitamin D deficiency, a common feature of PCOS. Therefore, complement pathway proteins and vitamin D levels may be linked in PCOS. MethodsWe measured plasma levels of complement pathway proteins by Slow Off-rate Modified Aptamer (SOMA)-scan plasma protein measurement for the classical (C4, C4a, and C4b) and alternative pathways (C3, C3b, iC3b, properdin, and factors B, D, and H) in weight and age-matched non-obese non-insulin resistant women with PCOS (n = 24) and control women (n = 24). Proteins that differed between groups were correlated with 25-hydroxyvitamin D-3 (25(OH)D-3) and 1,25-dihydroxyvitamin D-3 (1,25(OH)(2)D-3), measured by isotope-dilution liquid chromatography tandem mass spectrometry. ResultsWomen with PCOS had a higher free androgen index and anti-Mullerian hormone, though insulin resistance was comparable to controls; likewise, C-reactive protein, a marker of inflammation, was comparable between cohorts. In the alternative complement pathway, C3, iC3b, and properdin were increased in PCOS (p <0.05), while C4 in the classical pathway was increased (p <0.05). 25(OH)D-3 levels positively correlated with C3b only in control subjects, with no correlation of 1,25(OH)(2)D-3 with any of the proteins. ConclusionIn a non-obese PCOS population matched for age, insulin resistance and inflammation, initiating proteins of the classical and alternate complement cascades were increased. However, a positive correlation with 25(OH)D-3 was only seen for C3b in control subjects, with no correlation to 1,25(OH)(2)D-3, suggesting that the increase in complement proteins in PCOS is vitamin D-independent.

Automated summary

The levels of complement pathway proteins are increased in non-obese women with PCOS, and this increase is independent of vitamin D.