Distribution of parvalbumin in specific fibre types of chicken skeletal muscles
1995
Nishida, J. | Machida, N.W.T. | Tagome, M. | Kasugai, Y.
1. The distribution of parvalbumin (PA), which functions as a relaxing factor in the skeletal muscles, was examined in slow anterior latissimus dorsi (ALD), fast posterior latissimus dorsi (PLD), mixed sartorius (SA), pectoralis superficialis (PS) and pectoralis profundus (PP) muscles from chickens. 2. The biochemical characteristics of these muscles were confirmed by the assay of total lactate dehydrogenase (LDH) activity as well as the LDH isozymes for anaerobic metabolism, and by the photometrical analysis of myoglobin for aerobic metabolism. 3. PA in individual muscles was determined by a sandwich ELISA and was demonstrated by 2-dimensional polyacrylamide-gel electrophoresis. 4. Because of poor myoglobin and higher LDH activity or M-type isozyme pattern, the PLD was confirmed as containing primarily fast-twitch glycolytic and oxidative-glycolytic (FG/FOG) fibres, while the SA was shown to be composed mostly of FOG fibres because of the highest myoglobin content and the intermediate LDH activity or H and M-type isozyme pattern. PA content was high and variable in both PLD and SA. 5. PA was undetectable in the ALD which appears to contain exclusively slow-tonic (ST) fibres, being verified by its myoglobin-rich nature and lowest LDH activity or predominant H-type isozyme characteristics. PA was absent from the PS and PP, which probably contain predominantly FG fibres because of negligible amounts of myoglobin and the highest LDH activities or M-type isozyme pattern.
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