ABSTRACT
Objective:To investigate the effect of botulinum neurotoxin type A (BoNT/A) on Nav1.3 sodium channels and the function of sodium current in neuropathic pain.Methods:Eighteen adult rats had a spared nerve injury (SNI) induced and then were randomly divided into a saline group and a BoNT/A group, each of 9. Another 9 rats formed a fake operation group, Five days after the SNI, BoNT/A (7U/kg or 15U/kg) or saline was subcutaneously administered into the plantar surface of a hindpaw. On the 3rd, 7th and 14th day after the injection, the SNI rats′ paw withdrawal threshold was measured. On the 7th and 14th day the expression of Nav1.3 protein in dorsal root ganglion (DRG) neurons was examined using western blotting, while any change in the functional tetrodotoxin-sensitive (TTX-S) current was recorded using the patch clamp technique.Results:Administration of BoNT/A at either 7U/kg or 15U/kg significantly increased the SNI-induced mechanical allodynia. The expression of Nav1.3 protein in DRG neurons increased significantly after the SNI, but had decreased significantly by the 7th and 14th day after the administration of BoNT/A. BoNT/A significantly decreased the current density in TTX-S sodium channels in DRG neurons following SNI.Conclusion:Administration of BoTN/A affects the expression of Nav1.3 protein and functional TTX-S current, relieving neuropathic pain.
ABSTRACT
With the rapid development of medical genetics,online Medelian inheritance in man (OMIM) manifests a more and more important role in medical genetics teaching.Using the educational form combining ‘ classroom teaching,review writing and seminar’,‘ Query and use of OMIM ’was introduced into the education of medical genetics.Reality practice revealed that this educational practice maintained advanced and timely status of knowledge and deeply activated self-studying and independent thinking ability of students.