Neurotensin (NT) administered intracerebroventricularly (i.c.v.) to rats, blocks intestinal transit (tested by charcoal meal) in linear relation to the log of the doses within the range of 0.6-2.5 nmoles/rat. NT in this test is about 40 times more active than morphine (M) and 6 times less active than dermorphin (DM) on a molar basis. Within this dose range NT does not induce analgesia (tail-flick test) or hypothermia (tested at 22 degrees C). The intestinal effect can also be elicited by injecting the peptide into the periaqueductal gray matter (PAG). NT injected intraperitoneally (i.p.) is inactive up to doses 4 times the maximal active i.c.v. dose. Naloxone (Nx) and dynorphin 1-13 could not antagonize the intestinal effect of i.c.v. NT. The relationship between this central intestinal effect and many other central effects of NT is discussed.

Effect on intestinal transit of neurotensin administered intracerebroventricularly to rats / D. Parolaro, M. Sala, G. Crema, L. Spazzi, E. Gori. - In: LIFE SCIENCES. - ISSN 0024-3205. - 33:Suppl.1(1983), pp. 485-488.

Effect on intestinal transit of neurotensin administered intracerebroventricularly to rats

M. Sala;
1983

Abstract

Neurotensin (NT) administered intracerebroventricularly (i.c.v.) to rats, blocks intestinal transit (tested by charcoal meal) in linear relation to the log of the doses within the range of 0.6-2.5 nmoles/rat. NT in this test is about 40 times more active than morphine (M) and 6 times less active than dermorphin (DM) on a molar basis. Within this dose range NT does not induce analgesia (tail-flick test) or hypothermia (tested at 22 degrees C). The intestinal effect can also be elicited by injecting the peptide into the periaqueductal gray matter (PAG). NT injected intraperitoneally (i.p.) is inactive up to doses 4 times the maximal active i.c.v. dose. Naloxone (Nx) and dynorphin 1-13 could not antagonize the intestinal effect of i.c.v. NT. The relationship between this central intestinal effect and many other central effects of NT is discussed.
Settore BIO/14 - Farmacologia
LIFE SCIENCES
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/182668
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