Active and inactive L-prolyl-L-leucyl glycinamide synthetic analogs in rat models of levodopa-treated Parkinson's disease.

The tripeptide, L-prolyl-L-leucyl-glycinamide (PLG) has been shown to facilitate dopaminergic mechanisms in the brain. In the present study, we evaluated the interaction of PLG and its synthetic analogs with levodopa in two animal models of Parkinson's disease. In one experiment using rats with chronic unilateral lesions of the nigrostriatal dopamine pathway, PLG and Z-PLG potentiated the contraversive rotation elicited by levodopa with carbidopa (L/C). In a second experiment using reserpinized rats, PLG, Z-PLG and cyclo-LG potentiated L/C reversal of hypokinesia. Further studies of the PLG analogs, Z-PLG and cyclo-LG as adjunctive drugs with levodopa in the treatment of parkinsonism are warranted.
AuthorsT C Case, S R Snider, V J Hruby, T Rockway
JournalLife sciences (Life Sci) Vol. 36 Issue 26 Pg. 2531-7 (Jul 1 1985) ISSN: 0024-3205 [Print] ENGLAND
PMID2861549 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)
Chemical References
  • Antiparkinson Agents
  • Dipeptides
  • Neuropeptides
  • Peptides, Cyclic
  • Levodopa
  • cyclo(leucylglycine)
  • MSH Release-Inhibiting Hormone
  • Carbidopa
  • Animals
  • Antiparkinson Agents (therapeutic use)
  • Carbidopa (therapeutic use)
  • Dipeptides (therapeutic use)
  • Drug Synergism
  • Drug Therapy, Combination
  • Levodopa (therapeutic use)
  • MSH Release-Inhibiting Hormone (analogs & derivatives)
  • Motor Activity (drug effects)
  • Neuropeptides
  • Parkinson Disease (drug therapy)
  • Peptides, Cyclic
  • Rats
  • Structure-Activity Relationship

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