Abstract
Anionic polyphosphate compounds are well-known to inhibit the formation of hydroxyapatite crystals. Vascular calcification (VC) is associated with an increase in crystalline calciprotein particles (CPPs) in the bloodstream. 2,3-Diphospho-D-glyceric acid (2,3-DPG) is a highly anionic Poly-P compound found in the concave center of erythrocytes where it binds to hemoglobin, thereby reducing oxygen affinity. Since 2.3-DPG exists in plasma, we hypothesized that 2,3-DPG may act as an endogenous inhibitor of VC. In comparison to widely recognized calcification inhibitors such as myo-inositol hexakisphosphate, 2,3-DPG significantly delayed the formation of crystalline CPPs. Additionally, 2,3-DPG inhibited calcification in a mouse vascular smooth muscle cell line (MOVAS) without cytotoxic effects. Taken together with the result that 2,3-DPG did not impact bone-like nodule formation in mouse osteoblast-like MC3T3-E1 cells, these results suggest that 2,3-DPG may inhibit VC selectively.
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