期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 43, 页码 18396-18401出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0910180106
关键词
cocaine abuse; dynorphin A analog; kappa opioid receptor antagonist; opioid peptide; stress
资金
- National Institute on Drug Abuse [R01 DA023924]
- State of Florida, Executive Office of the Governor's Office of Tourism, Trade, and Economic Development
The cyclic peptide zyklophin {[N-benzylTyr(1), cyclo(D-Asp(5), Dap(8))-dynorphin A-(1-11)NH2, Patkar KA, et al. (2005) J Med Chem 48: 4500-4503} is a selective peptide kappa opioid receptor (KOR) antagonist that shows activity following systemic administration. Systemic (1-3 mg/kg s.c.) as well as central (0.3-3 nmol intracerebroventricular, i.c.v.) administration of this peptide dose-dependently antagonizes the antinociception induced by the selective KOR agonist U50,488 in C57BL/6J mice tested in the 55 degrees C warm water tail withdrawal assay. Zyklophin administration had no effect on morphine- or SNC-80-mediated antinociception, suggesting that zyklophin selectively antagonizes KOR in vivo. Additionally, the antagonism of antinociception induced by centrally (i.c.v.) administered U50,488 following peripheral administration of zyklophin strongly suggests that the peptide crosses the blood-brain barrier to antagonize KOR in the CNS. Most importantly, the antagonist activity of zyklophin (-3 mg/kg s.c.) lasts less than 12 h, which contrasts sharply with the exceptionally long duration of antagonism reported for the established small-molecule selective KOR antagonists such as norbinaltorphimine (nor-BNI) that last weeks after a single administration. Systemically administered zyklophin (3 mg/kg s.c.) also prevented stress-induced reinstatement of cocaine-seeking behavior in a conditioned place preference assay. In conclusion, the peptide zyklophin is a KOR-selective antagonist that exhibits the desired shorter duration of action, and represents a significant advance in the development of KOR-selective antagonists.
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