Changes in muscle proteomics in the course of the Caudwell Research Expedition to Mt. Everest


Levett, Denny Z.H., Viganò, Agnese, Capitanio, Daniele, Vasso, Michele, De Palma, Sara, Moriggi, Manuela, Martin, Daniel S, Murray, Andrew J., Cerretelli, Paolo, Grocott, Mike P.W. and Gelfi, Cecilia (2014) Changes in muscle proteomics in the course of the Caudwell Research Expedition to Mt. Everest Proteomics, pp. 1-12. (doi:10.1002/pmic.201400306). (PMID:25370915).

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Description/Abstract

This study employed differential proteomic and immunoassay techniques to elucidate the biochemical mechanisms utilized by human muscle (vastus lateralis) in response to high altitude hypoxia exposure. Two groups of subjects, participating in a medical research expedition (A, n = 5, 19d at 5300 m altitude; B, n = 6, 66d up to 8848 m) underwent a ? 30% drop of muscular creatine kinase and of glycolytic enzymes abundance. Protein abundance of most enzymes of the tricarboxylic acid cycle and oxidative phosphorylation was reduced both in A and, particularly, in B. Restriction of ?-ketoglutarate toward succinyl-CoA resulted in increased prolyl hydroxylase 2 and glutamine synthetase. Both A and B were characterized by a reduction of elongation factor 2alpha, controlling protein translation, and by an increase of heat shock cognate 71 kDa protein involved in chaperone-mediated autophagy. Increased protein levels of catalase and biliverdin reductase occurred in A alongside a decrement of voltage-dependent anion channels 1 and 2 and of myosin-binding protein C, suggesting damage to the sarcomeric structures. This study suggests that during acclimatization to hypobaric hypoxia the muscle behaves as a producer of substrates activating a metabolic reprogramming able to support anaplerotically the tricarboxylic acid cycle, to control protein translation, to prevent energy expenditure and to activate chaperone-mediated autophagy.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1002/pmic.201400306
ISSNs: 1615-9853 (print)
Keywords: altitude hypoxia, biomedicine, ?-ketoglutarate
Subjects: Q Science > QP Physiology
Organisations: Clinical & Experimental Sciences
ePrint ID: 372852
Date :
Date Event
4 December 2014Published
Date Deposited: 23 Dec 2014 14:29
Last Modified: 17 Apr 2017 06:54
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/372852

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