Add time:09/02/2019         Source:sciencedirect.com

The effects of systemic administration (i.p.) of dynorphin A(1–13) on the cocaine-induced behavioural alterations in the mouse were determined by using multi-dimensional behavioural analyses, based upon a capacitance system. A 1.0 mg/kg dose of cocaine did not influence behaviour, while increasing doses to 3–30 mg/kg produced a significant increment in the frequency of behaviour, such as linear locomotion, circling, rearing and grooming. Although a 1.0 mg/kg dose of dynorphin A(1–13) alone produced a significant decrease in grooming behaviour, larger doses (3.0 and 10.0 mg/kg) of the peptide failed to affect different behaviour. The cocaine (3.0 mg/kg)-induced increases in linear locomotion, circling and rearing behaviour were significantly inhibited by dynorphin A(1–13) (10.0 mg/kg). The inhibitory effects of dynorphin A(1–13) (10.0 mg/kg) were antagonized by the opioid antagonist Mr 2266 (5.6 mg/kg). It is thus possible that the systemic administration of dynorphin A(1–13) inhibits different behavioural responses induced by cocaine through the blood-brain barrier, although the instability of amino acid bonds or the relatively large molecular weight of dynorphin A(1–13), may result in the failure to demonstrate opioid activity by the peptide after systemic administration.

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