Changes in the Levels of Neuropeptides and Their Metabolizing Enzymes in the Brain Regions of Nucleus Basalis Magnocellularis-Lesioned Rats

Abstract

Abstract. The regulation mechanism of the interrelation between neuropeptides and their metabolizing enzymes in in vivo tissues is still not clear. In the present report, we attempted to measure the levels of neuropeptides and their enzymes in the frontal cortex, hippocampus, and striatum of the rat that had been bilaterally lesioned by the infusion of ibotenic acid or amyloid b-peptide 25 -35 (Ab 25 -35) into the nucleus basalis magnocellularis. In the drug-treated rats, at two weeks after the infusion, the decrease of somatostatin-like immunoreactivity (SS-LI) and the increase of cholecystokinin-8S-LI were found in some brain regions relative to vehicletreated rats. The immunoreactivities of endopeptidase 24.15 and puromycin-sensitive aminopeptidase and the leucine aminopeptidase-and aminopeptidase B-like enzyme activities did not change in the three brain regions, suggesting that the levels of those peptide-degrading enzymes do not correlate with the changes of the neuropeptide levels. The decrease of subtilisin-like proprotein convertase (SPC)-like enzyme activity was found in the hippocampus of the Ab25 -35-treated rats. The SS mRNA level decreased in the hippocampus in parallel with decreases in the SS-LI level and SPC-like enzyme activity. The present data indicate that some of the neuropeptide-processing enzymes may contribute to the control of neuropeptide levels.

Effects of Acupuncture at Ht7 on Glucose Metabolism in a Rat Model of Alzheimer's Disease: An 18F-FDG-PET study

“…Firstly, to induce our AD model, we chose intraperitoneal injection of D-gal combined with injection of IBO into the NBM based on our previous study. 34 This AD rat model mimics certain symptoms of AD (neurodegeneration 35 and memory impairment 36 ) but lacks tangle formation and neuronal loss. Secondly, we were unable to directly explain the relationship between cerebral metabolic activity and prognosis in AD.…”