Ryan 2016 J Mol Cell Cardiol

Ryan TE, Schmidt CA, Alleman RJ, Tsang AM, Green TD, Neufer PD, Brown DA, McClung JM (2016) Mitochondrial therapy improves limb perfusion and myopathy following hindlimb ischemia. J Mol Cell Cardiol 97:191-6.

» PMID: 27262673

Ryan TE, Schmidt CA, Alleman RJ, Tsang AM, Green TD, Neufer PD, Brown DA, McClung JM (2016) J Mol Cell Cardiol

Abstract: Critical limb ischemia is a devastating manifestation of peripheral arterial disease with no effective strategies for improving morbidity and mortality outcomes. We tested the hypothesis that cellular mitochondrial function is a key component of limb pathology and that improving mitochondrial function represents a novel paradigm for therapy. BALB/c mice were treated with a therapeutic mitochondrial-targeting peptide (MTP-131) and subjected to limb ischemia (HLI). Compared to vehicle control, MTP-131 rescued limb muscle capillary density and blood flow (64.7±11% of contralateral vs. 39.9±4%), and improved muscle regeneration. MTP-131 also increased electron transport system flux across all conditions at HLI day-7. In vitro, primary muscle cells exposed to experimental ischemia demonstrated markedly reduced (~75%) cellular respiration, which was rescued by MTP-131 during a recovery period. Compared to muscle cells, endothelial cell (HUVEC) respiration was inherently protected from ischemia (~30% reduction), but was also enhanced by MTP-131. These findings demonstrate an important link between ischemic tissue bioenergetics and limb blood flow and indicate that the mitochondria may be a pharmaceutical target for therapeutic intervention during critical limb ischemia.

• O2k-Network Lab: US NC Greenville Neufer PD, US NC Greenville Brown DA, US VA Blacksburg Brown DA

Labels: MiParea: Respiration, mt-Medicine

Stress:Ischemia-reperfusion Organism: Mouse Tissue;cell: Skeletal muscle Preparation: Isolated mitochondria

Coupling state: LEAK, OXPHOS, ET Pathway: N, S, CIV, NS, ROX HRR: Oxygraph-2k

2016-07