Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9414748 | Developmental Brain Research | 2005 | 8 Pages |
Abstract
Ontogenetic studies indicate that inositol phosphate accumulation in rodent brain tissue by cholinergic muscarinic agonists as well as expression of high-affinity neurotensin receptor (NTS1) peak at 7 days after birth. Herein, potential participation of this receptor in such effect was investigated. Cerebral cortex prisms of 7-day-old rats were preloaded with [3H]myoinositol and later incubated during 60 or 20 min in the presence of muscarinic agonist carbachol plus neurotensin and SR 48692, a non-peptide NTS1 antagonist. In 60-min incubation experiments, inositol phosphate accumulation by 10â3 M carbachol was roughly 320%, an effect which remained unaltered plus 10â6 M to 10â4 M neurotensin but partially decreased with equimolar SR 48692 concentration. In 20-min incubation experiments, inositol phosphate accumulation by 10â3 M carbachol was circa 240%, a value which attained 320-360% plus 10â7 M neurotensin; this effect was totally blocked by 10â7 M SR 48692. It was concluded that in inositol phosphate accumulation by carbachol, besides the cholinergic muscarinic receptor, the NTS1 receptor is likewise involved; findings at 60 min are attributable to the effect of endogenous neurotensin whereas those at 20 min most likely involve both endogenous and exogenously added peptide.
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Authors
S. Pereyra-Alfonso, M.G. López Ordieres, M. del V. Armanino, G. RodrÃguez de Lores Arnaiz,