Objective:To study the expression of adult and neonatal Nav1.5 isoforms in the dorsal root ganglia (DRG) neurons of rats with spared nerve injury (SNI) . Methods:The expression of adult and neonatal Nav1.5 isoforms in the DRG neurons of rats with SNI was detected by RT-PCR, DNA sequencing, restriction enzyme digestion, immunohistochemistry and immunofluo-rescence methods. The expression of PKC-γwas detected by Western blot. Results:Both adult and neonatal Nav1.5 isoforms were expressed in the DRG neurons, but their expression ratio was approximately 2.5∶1. In SNI rat models, the expression of both adult and neonatal Nav1.5 isoforms decreased by approximately a half in both mRNA and protein levels. In contrast, the expression of PKC-γincreased by approximately one-fold. Conclusions:Both adult and neonatal Nav1.5 isoforms expressed in the DRG neurons of rat,but their expression levels decrease in pain models. The up-regulation of PKC-γmay directly or indirectly down-regulate the expression of Nav1.5 isoforms in SNI rat models,which may further involve in the pathological process of neuropathic pain.

OBJECTIVE:To evaluate the pharmacodynamics and therapeutic effect of Jiakang Ⅰ oral liquid.METHODS:The drug actions of tapazole,NS and Jiakang Ⅰ were compared in the animal model of hyperthyroidism.205 hyperthyroidism cases were treated with Jiakang Ⅰ in a double blind design and the therapeutic effect was observed.RESULTS:Pharmacodynamic observation revealed that Jiakang Ⅰ could decreased T3,T4 and increase TSH significantly in rats.Compared with control group treated with tapazole or NS,in Jiakang Ⅰ group,T3 and T4 were obviously reduced and TSH was increased and the clinical symptoms were alleviated without any marked adverse reaction.CONCLUSION:The hyperthyroidism animal model can be applied to evaluating the pharmacodynamic effect of Jiakang Ⅰ.This drug has satisfactory therapeutic effect on hyperthyroidism.