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Differences in the pharmacological actions intra thecally administered neurotensin and morphine

Regulatory Peptides 3(2): 97-104

Differences in the pharmacological actions intra thecally administered neurotensin and morphine

Neurotensin or morphine can each cause hypothermia and an antinocisponsive effect when administered into the liquor spaces of the rat brain. These actions of neurotensin are not blocked by naloxone whereas those of morphine are. The present experiments examined the action of each substance following its injection into the subarachnoid space of the spinal cord. Given intrathecally, neurotensin evoked a dose-related fall in the rectal temperature of the rat without exerting an antinocisponsive action. Morphine evoked hyperthermia and a dose-related antinocisponsive action. Since neurotensin exerted an effect on rectal temperature opposite to that of morphine and failed to exert an antinocisponsive effect, the data provide further evidence to suggest that neurotensin and morphine exert their effect via different mechanisms. Neurotensin may exert its antinocisponsive action via a supraspinal site.

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Accession: 005151467

PMID: 6895946

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