Alteration of sarcoplasmic reticulum Ca2+ ATPase expression in lower limb ischemia caused by atherosclerosis obliterans

J. Fodor, A. Gomba-Toth, T. Oláh, E. Zádor, Z. C. Toth, I. Ioannis, B. Molnár, I. Kovács, L. Csernoch

Research output: Article

Abstract

Atherosclerosis is a disease caused by a build-up of fatty plaques and cholesterol in the arteries. The lumen of the vessels is obliterated resulting in restricted blood supply to tissues. In ischemic conditions, the cytosolic Ca2+ level of skeletal muscle may increase, indicating the alteration of Ca2+ removal mechanisms. Ca2+ is transported from cytosol into the sarcoplasmic reticulum by Ca2+ ATPase (SERCA), with its 1a isoform expressed in adult, while its 1b isoformin neonatal and regenerating fast-Twitch skeletalmuscle. To investigate the role of these isoforms in ischemic skeletal muscle, biopsies from musculus biceps femoris of patients who underwent amputation due to atherosclerosis were examined. Samples were removed from the visibly healthy and hypoxia-Affected tissue. Significantly increased SERCA1a expression was detected under the ischemic conditions (246 ± 69%; p < 0.05) compared with the healthy tissue. Furthermore, the ratio of SERCA1a-positive fibers was slightly increased (46 ± 4% in healthy tissue and 60 ± 5% in ischemic tissue; p > 0.05), whereas SERCA2a did not change. In addition, in primary cultures derived from hypoxia-Affected tissue, the diameter and fusion index of myotubes were significantly increased (30 ± 1.6 μm vs. 41 ± 2.4 μm and 31 ± 4% vs. 45 ± 3%; p < 0.05). We propose that the increased SERCA1a expression indicates the existence and location of compensating mechanisms in ischemic muscle.

Original languageEnglish
Pages (from-to)183-192
Number of pages10
JournalPhysiology International
Volume104
Issue number2
DOIs
Publication statusPublished - jún. 2017

ASJC Scopus subject areas

  • Physiology (medical)

Fingerprint Dive into the research topics of 'Alteration of sarcoplasmic reticulum Ca<sup>2+</sup> ATPase expression in lower limb ischemia caused by atherosclerosis obliterans'. Together they form a unique fingerprint.

  • Cite this