• Sara Panizo, Manuel Naves-Díaz, Natalia Carrillo-López, Laura Martínez-Arias, José Luis Fernández-Martín, María Piedad Ruiz-Torres, Jorge B Cannata-Andía, and Isabel Rodríguez.
• Bone and Mineral Research Unit, Reina Sofia Institute of Renal Research (IRSIN), Renal Research Network (REDinREN) from Carlos III Health Institute (ISCIII), Hospital Universitario Central de Asturias, Oviedo, Asturias, Spain;
• J. Am. Soc. Nephrol. 2016 Mar 1; 27 (3): 824-34.

AbstractVascular calcification is a frequent cause of morbidity and mortality in patients with CKD and the general population. The common association between vascular calcification and osteoporosis suggests a link between bone and vascular disorders. Because microRNAs (miRs) are involved in the transdifferentiation of vascular smooth muscle cells into osteoblast-like cells, we investigated whether miRs implicated in osteoblast differentiation and bone formation are involved in vascular calcification. Different levels of uremia, hyperphosphatemia, and aortic calcification were induced by feeding nephrectomized rats a normal or high-phosphorus diet for 12 or 20 weeks, at which times the levels of eight miRs (miR-29b, miR-125, miR-133b, miR-135, miR-141, miR-200a, miR-204, and miR-211) in the aorta were analyzed. Compared with controls and uremic rats fed a normal diet, uremic rats fed a high-phosphorous diet had lower levels of miR-133b and miR-211 and higher levels of miR-29b that correlated respectively with greater expression of osteogenic RUNX2 and with lower expression of several inhibitors of osteoblastic differentiation. Uremia per se mildly reduced miR-133b levels only. Similar results were obtained in two in vitro models of vascular calcification (uremic serum and high-calcium and -phosphorus medium), and experiments using antagomirs and mimics to modify miR-29b, miR-133b, and miR-211 expression levels in these models confirmed that these miRs regulate the calcification process. We conclude that miR-29b, miR-133b, and miR-211 have direct roles in the vascular smooth muscle calcification induced by high phosphorus and may be new therapeutic targets in the management of vascular calcification. Copyright © 2016 by the American Society of Nephrology.

49 keywords...

hide…