SR 142948 dihydrochloride is an orally active and selective non-peptide neurotensin receptor (NT) antagonist with IC50s of 1.19 nM, 0.32 nM, 3.96 nM in h-NTR1-CHO cells, HT-29 cells, and adult rat brain, respectively. SR 142948 dihydrochloride antagonizes NT-induced inositol monophosphate formation in HT-29 cells with an IC50 of 3.9 nM. SR 142948 dihydrochloride blocks hypothermia, analgesia and steering behavior induced by NT in vivo. SR 142948 dihydrochloride shows blood-brain permeability and can be used in study of psychiatric disorders[2].In Vitro:SR 142948 (1 μM; 90 min) dihydrochloride inhibits expression of c-fos and krox24 in CHO-hNT1-R cells.
SR 142948 (0-1 μM; 1 h) dihydrochloride exhibits good antagonistic activity by inhibiting [125I-Tyr3]NT binds to h-NTR1-CHO and HT 29 cell membranes, with IC50s of 1.19 and 0.32 nM, respectively[2].
SR 142948 (0-1 μM; 30 min) dihydrochloride antagonizes production of IP1 stimulated by NT both in h-NTR1-CHO and HT 29 cells, in a concentration-dependent manner[2].
SR 142948 (1, 10 nM; 60-80 s) dihydrochloride antagonizes intracellular calcium mobilization stimulated by NT in h-NTR1-CHO cells[2].In Vivo:SR 142948 (2 μg/kg; p.o.; single) dihydrochloride inhibits the turning behavior induced by NT (10 pg/mouse)[2].
SR 142948 (0.01, 0.03, 0.3 mg/kg; i.p.; single) dihydrochloride prevents the enhancement of ACh release produced by NT (100 nM), in a dose-dependent manner[2].
SR 142948 (0-10 mg/kg; p.o.; single) dihydrochloride partially but significantly blocks NT-induced hypothermia (53% at 2 mg/kg in rats and 54% at 4 mg/kg in mice)[2].