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- W2015707448 abstract "The object of this study was to determine if the newly developed phenanthridine derivative, CY 208-243, retains its apparent in vivo preference for dopamine D-1 receptors under conditions of dopamine depletion, as a starting point to understanding why CY 208-243 possesses antiparkinson activity and the selective D-1 agonist SKF 38393 does not. Three hours after receiving reserpine (5 mg/kg), mice were strongly sedated and completely unresponsive to the motor stimulant effects of CY 208-243 (0.1-10 mg/kg) or the selective D-2 agonist RU 24213 (0.5-5 mg/kg) administered alone. After 24 h reserpine, the akinesia was partially and dose-dependent reversed by both CY 208-243 (0.1-10 mg/kg) and RU 24213 (0.5-5 mg/kg) alone. CY 208-243 also stimulated rearing and grooming, while RU 24213 gave rise to strong head-down sniffing. The response to 1 mg/kg CY 208-243 was practically abolished by pretreatment with the D-1 antagonist SCH 23390 (0.2 mg/kg). On the other hand, blocking D-2 receptors with metoclopramide (0.25 mg/kg) unexpectedly facilitated CY 208-243-induced locomotion and rearing, but suppressed grooming. When CY 208-243 (1 mg/kg) was injected together with RU 24213 (0.5-5 mg/kg), the two drugs interacted synergistically to stimulate locomotion at all times after reserpine. These animals also exhibited a greater preponderance of grooming, sniffing, gnawing and oral dyskinesia. Apart from the potentiation of some elements of CY 208-243-stimulated motor behaviour by D-2 blockade, these results are qualitatively indistinguishable from those previously obtained with the prototype D-1 agonist SKF 38393.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2015707448 date "1991-02-01" @default.
- W2015707448 modified "2023-09-27" @default.
- W2015707448 title "CY 208–243 behaves as a typical D-1 agonist in the reserpine-treated mouse" @default.
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- W2015707448 doi "https://doi.org/10.1016/0091-3057(91)90275-7" @default.
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