Abstract
An increasing amount of patients affected by advanced chronic kidney disease suffer from vascular calcification (VC) that associates with cardiovascular morbidity and mortality. In this study, we created a new experimental in vitro model, trying to better elucidate high phosphate (Pi)-induced VC pathogenic mechanisms. Rat aortic vascular smooth muscle cells (VSMCs) were challenged for 7-10 days with high Pi with a repeated and short suspensions of high Pi treatment (intermittent suspension, IS) that was able to induce a significant inhibition of high Pi calcification, maximal at 5 h. Interestingly, the delay in calcification is a consequence of either the absence of free Pi or calcium-phosphate crystals being comparable to the total effect obtained during the 5 h-IS. The protective effect of IS was mediated by the reduction of apoptosis as demonstrated by the action of 20 μmol/L Z-VAD-FMK and by the preservation of the pro-survival receptor Axl expression. Furthermore, autophagy, during IS, was potentiated by increasing the autophagic flux, evaluated by LC3IIB western, while treating VSMCs with 1 mmol/L valproic acid did not affect VC. Finally, IS prevented VSMC osteoblastic differentiation by preserving smooth muscle lineage m...Continue Reading
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