Abstract：
:Neurotensin (NT) is a neuropeptide neurotransmitter in the central nervous system. It has been implicated in the therapeutic and in the adverse effects of neuroleptics. Activity of NT in brain can only be shown by direct injection of the peptide into that organ. However, we have developed a novel analog of NT(8-13), NT69L, which is active upon intraperitoneal (i.p.) injection. Like atypical neuroleptics, NT69L blocked the climbing behavior in rats, but not the licking and sniffing behaviors of a high dose (600 microgram/kg) of the non-selective dopamine agonist apomorphine. Its blockade of climbing was very potent with an ED(50) (effective dose at 50% of maximum) of 16 microgram/kg. Both apomorphine and NT69L caused a long-lasting hypothermia, which was greater with the peptide but not synergistic in combination with apomorphine. The ED(50) of NT69L for hypothermia was 390 microgram/kg. NT69L (up to 5 mg/kg i.p.) did not produce catalepsy. However, when given before haloperidol, NT69L, but not clozapine, completely prevented catalepsy. When given after haloperidol, NT69L, but not clozapine, reversed haloperidol's cataleptic effects with an ED(50) of 260 microg/kg. There was no significant difference between the ED(50)s for hypothermia and anticataleptic effects of NT69L. However, the ED(50) for blocking the effects of apomorphine was significantly lower than the other two. These data suggest that NT69L may have neuroleptic properties in humans and may be useful in the treatment of extrapyramidal side effects caused by typical neuroleptics such as haloperidol.
journal_name
Brain Resjournal_title
Brain researchauthors
Cusack B,Boules M,Tyler BM,Fauq A,McCormick DJ,Richelson Edoi
10.1016/s0006-8993(99)02363-xsubject
Has Abstractpub_date
2000-02-21 00:00:00pages
48-54issue
1-2eissn
0006-8993issn
1872-6240pii
S0006-8993(99)02363-Xjournal_volume
856pub_type
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