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Carbonic anhydrase (CA) III is very abundant in type I skeletal muscle, but its function is still debated. Our aims were to examine CA III expression during growth and determine whether the effects of CA inhibition previously observed in adult muscles could be seen in younger rats in which CA III levels are lower. CA III content and activity were measured in soleus muscles from 10- to 100-day-old rats, and the influence of CA inhibitor on fatigue and hexosemonophosphate content was quantified in vitro. CA III activity and content increased fivefold between 10 and 100 days of age. Data analysis revealed that the influence of CA inhibitor on fatigue was to some extent positively and linearly related to the level of CA III activity. Hexosemonophosphate accumulation with CA inhibition also became more significant with age. In conclusion, CA III level in soleus muscle does not stabilize before 3 mo after birth; data also confirm that the effects of CA inhibitors are due to inhibition of the CA III isoform.

american journal of physiology. regulatory, integrative and comparative physiology/american journal of physiology. regulatory, integrative, and comparative physiology

Metabolic and contractile influence of carbonic anhydrase III in skeletal muscle is age dependent