title: On the subsarcolemmal localization of phenazine ethosulfate-linked alpha-glycerophasphate dehydrogenase activity in pigeon pectoralis white muscle fibres.
abstract: In this study frozen sections of avian striated muscles were incubated for mitochondrial alpha-glycerophosphate de hydrognease (alpha=GPD) reaction, and the effect of menadione, phenazine methosulfate (PMS) or phenazine ethosulfate (PES) as intermediate electron acceptors was evaluated. Under histochemical conditions, PMS or PES-linked alpha-GPD reaction was poor in the chicken posterior latissimus dorsi and chicken pectoralis muscles. However, PMS or PES-linked alpha-GPD reaction was present characteristically in the subsarcolemmal mitochondria of the "broad white" fibres of the pigeon pectoralis muscle only; the subsarcolemmal mitochondria of the narrow red fibres lacked such a reaction pattern. The above reaction pattern, however, differed when compared with the menadione-linked alpha-GPD reaction. The present histochemical evidence suggests the existence of an inherent heterogeneity in the mitochondrial populations of the different avian striated muscle fibres studied.
mesh_terms: D000818:Animals; D002645:Chickens; D010856:Columbidae; D005993:Glycerolphosphate Dehydrogenase / Q000032:analysis*; D006651:Histocytochemistry; D008773:Methylphenazonium Methosulfate; D008931:Mitochondria, Muscle / Q000201:enzymology*; D010619:Phenazines; D012508:Sarcolemma / Q000201:enzymology* / Q000648:ultrastructure; D013045:Species Specificity; D014812:Vitamin K
chemical_list: D010619:Phenazines; D014812:Vitamin K; D008773:Methylphenazonium Methosulfate; D005993:Glycerolphosphate Dehydrogenase