title: Changes in the concentration of the calcium-binding parvalbumin in cross-reinnervated rat muscles. Comparison of biochemical with physiological and histochemical parameters.
abstract: The fast extensor digitorum longus (EDL) and the slow soleus (SOL) muscles were cross-reinnervated in both directions in the rat. During the following transformation of muscle type properties, the expression of the Ca2+-binding parvalbumin (parvalbumin, Mr = 12,000) was investigated. The combined biochemical, histochemical, and physiological results demonstrated that the amount of parvalbumin decreased in the fast to slow (X-EDL) and increased in the slow to fast (X-SOL) transformation. Alterations of parvalbumin-mRNA levels were similar to changes found at the protein level, indicating a tight transcriptional regulation of the parvalbumin expression. The close correlation, however, between parvalbumin and relaxation speed found in normal muscles had changed after cross-reinnervation. After the altered nervous input, a slow contracting/slow relaxing muscle may even contain more parvalbumin than a fast contracting/fast relaxing one. The expression of parvalbumin may depend on the nerve-muscle interaction, and parvalbumin may thus be used as a sensitive marker for early stages of muscular transformation and neurological disorders.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D004591:Electrophoresis, Polyacrylamide Gel; D006651:Histocytochemistry; D007124:Immunoenzyme Techniques; D007700:Kinetics; D008297:Male; D009119:Muscle Contraction; D009124:Muscle Proteins / Q000378:metabolism*; D009126:Muscle Relaxation; D009132:Muscles / Q000294:innervation* / Q000378:metabolism; D010320:Parvalbumins / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D014158:Transcription, Genetic
chemical_list: D009124:Muscle Proteins; D010320:Parvalbumins; D012333:RNA, Messenger; D002118:Calcium