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Volumn 283, Issue 5400, 1999, Pages 401-404

Unresponsiveness to cannabinoids and reduced addictive effects of opiates in CB1 receptor knockout mice

Author keywords

[No Author keywords available]

Indexed keywords

CANNABINOID; CANNABINOID RECEPTOR; OPIATE RECEPTOR;

EID: 0033555839     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.283.5400.401     Document Type: Article
Times cited : (1127)

References (30)
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    • note
    • Animals were housed at 21° ± 1°C with free access to food and water. Experiments were conducted in accordance with local ethical guidelines. The measurement of locomotor activity, and the open-field and elevated plus maze tests were performed as described (24). Mice were exposed to the open field for three consecutive days. The number of squares crossed was as follows: wild type: 170 ± 12, 127 ± 10, and 91 ± 11 for first, second, and third days, respectively; knockout: 256 ± 20 (P < 0.01), 158 ± 15 (NS), and 120 ± 16 (NS) for first, second, and third days, respectively (t test, n = 15 per group).
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    • Nociceptive thresholds were monitored by applying thermal (tail-immersion and hot-plate tests), mechanical (tail-pressure test), or chemical stimuli (writhing test) (24). For the tail-immersion test, mice were maintained in a cylinder, and their tail was immersed in water at 50°C; latency to tail withdrawal was recorded. In the hot-plate test, mice were placed on a surface heated to 50°C, and the latencies for licking their paws and jumping were recorded. For the tail-pressure test, increasing pressure (tip diameter: 1 mm) was applied to the tails of the mice until a withdrawal response was elicited. In the writhing test, mice received 0.1 ml per 10 g of body weight of a 0.6% acetic acid solution by the intraperitoneal route, and contractions of abdominal musculature (writhes) were counted between 5 and 15 min after the injection.
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    • note
    • We thank A. Nagy for R1 embryonic stem cells, C. Dewolf and M. J. Simons for technical assistance, and D. Penninck for discussions. Supported by the Inter-university Poles of Attraction (Belgian State, Prime Minister's Office, Federal Service for Science, Technology and Culture), the Fonds de la Recherche Scientifique Médicale, the EU BIOMED II programme, and the Fondation Médicale Reine Elisabeth. The scientific responsibility is assumed by the authors. C.L. is Chercheur Qualifié of the Fonds National de la Recherche Scientifique.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.