Changes in the Central Dopaminergic Systems in the Streptozotocin-induced Diabetic Rats

  • Lim, D.K. (College of Pharmacy, Chonnam National University) ;
  • Lee, K.M. (College of Pharmacy, Chonnam National University) ;
  • Ho, I.K. (Department of Pharmacology and Toxicology, University of Mississippi Medical Center)
  • Published : 1994.12.01

Abstract

The behavioral response, depamine metabolism, and characteristics of dopamine subtypes after developing the hyperlycemia were studied in the striata of rats. In animals developed hyperglycemia, the on-set duration of cataleptic behavior responded to SCH 23390 injection was delayed abd shortened, respectively. However, the cataleptic response to spiperone occurred significantly earlier in on-set and prolonged in duration. Dopamine metabolites, dihydroxyphenylacetic acid (DDPAC) and homovanillic acid (HVA), were significantly reduced in teh striata of hyeprglycemic rats. However, level of DA was significantly increased. It is noted that the ratios of DOPAC and HVA to DA were decreased, suggesting decreased tumover of DA. The affinity of striatal D-1 receptors was significantly increased without changes in the number of binding sites, while the maximum binding number of D-2 recptors was significantly increased without affecting its affinity in the diabetic rats. These results indicate that the dopaminergic activity in striatia was altered in hyperglycemic rats. Furthermore, it suggests that the upregulation of dopamine receptors might be due to the decreased dopamine matabolism.

Keywords

References

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