Abstract

AMARU, Ricardo et al. MOLECULAR MECHANISM OF STATINS IN THE TREATMENT OF HIGH ALTITUDE PATHOLOGICAL ERYTHROCYTOSIS. Rev. Méd. La Paz [online]. 2013, vol.19, n.2, pp.19-27. ISSN 1726-8958.

Introduction The High altitude Pathological Erythrocytosis is the chronic mountain sickness hematologic manifestation by inadequate adaptation to high altitudes of genes regulating erythropoiesis. Statins are inhibitors of the mevalonate pathway involved in the regulation of erythropoiesis. This paper describes the molecular mechanisms of erythropoiesis inhibitionin patients with pathological erythrocytosis. Material and methods We studied 35 patients with pathological erythrocytosis from La Paz and El Alto city (3600 and 4000 masl respectively). Were performed hematopoietic progenitor cell culture and Western blotting. Results Statins induce apoptosis in liquid culture medium. without simvastatin erythroid progenitors from apoptosis presentarón and 12.3% in the group supplemented with simvastatin 38.4% apoptosis (p = 0.001), statins also inhibit the proliferation and differentiation of erythroid progenitors, and inhibit transcription of STAT-5. Conclusions The molecular mechanisms involved in the erythropoiesis inhibition are: a) Inhibition of Ras and Rho isoprenylation, b) Inhibition of Jak-2 and Stat-5 phosphorylation, c) inhibition of EpoR glycosylation, d) Statins reduce lipid rafts cholesterol and reduce JAK2 localization to lipid rafts, e) Induction of apoptosis through caspase 9 and BclxL.

Keywords : Pathological Erythrocytosis; Chronic mountain sickness; statins.

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