title: Effects of simulated weightlessness on Calbindin D-28K-immunoreactivity in rat soleus muscle spindle.
abstract: Objective. To analyze the mechanism involved in muscle spindle deterioration during simulated weightlessness. Method. Using the immunoperoxidase reaction utilizing the ABC (avidin-biotin-complex) method, Calbindin D28K-like immunoreactivity (CaBP-LI) of intrafusal fibres in soleus muscle were detected in 7 d, 14 d tail-suspended rats and compared with control rats. Result. The extrafusal muscle fibres and nerve fibres did not exhibit immunoreactivity to CaBP. CaBP-LI was found in some of the intrafusal muscle fibres in all the muscle spindles. After 14 d suspension, the immunoreactivity to CaBP of the intrafusal fibres decreased markedly. Conclusion. Simulated weightlessness could induce changes in the immunoreactivity of rat soleus muscle spindle to CaBP, which may contribute to the deterioration of muscle spindle.
authors.affiliation: Department of Physiology, Xi'an Jiaotong University.
authors.forename: Su-di
authors.initials: SD
authors.lastname: Wu
authors.forename: Xiao-li
authors.initials: XL
authors.lastname: Fan
authors.forename: Bin
authors.initials: B
authors.lastname: Tang
mesh_terms: D000818:Animals; D064092:Calbindin 1; D064026:Calbindins; D002118:Calcium / Q000378:metabolism; D005260:Female; D019417:Hindlimb Suspension; D007150:Immunohistochemistry; D009470:Muscle Spindles / Q000276:immunology / Q000378:metabolism / Q000473:pathology*; D018482:Muscle, Skeletal / Q000276:immunology / Q000378:metabolism / Q000473:pathology*; D009133:Muscular Atrophy / Q000209:etiology* / Q000378:metabolism / Q000473:pathology; D009419:Nerve Tissue Proteins / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D064030:S100 Calcium Binding Protein G / Q000276:immunology* / Q000378:metabolism; D013997:Time Factors; D018474:Weightlessness Simulation / Q000009:adverse effects*
chemical_list: C576500:Calb1 protein, rat; D064092:Calbindin 1; D064026:Calbindins; D009419:Nerve Tissue Proteins; D064030:S100 Calcium Binding Protein G; D002118:Calcium