Abstract
1. o 2. 1. Isoproterenol increased interscapular brown adipose tissue (BAT) blood flow and temperature. 3. 2. Phenylephrine increased BAT temperature, but did not affect blood flow. The effect was completely suppressed by N ω -nitro- l-arginine methyl ester ( l-NAME), an inhibitor of endogenous NO synthesis. 4. 3. Isoproterenol plus phenylephrine increased BAT blood flow and temperature earlier than isoproterenol alone. 5. 4. CL316,243 increased BAT blood flow and temperature. These effects were also inhibited by l-NAME. 6. 5. These data suggest that BAT blood flow as well as thermogenesis is regulated mainly by β-adrenoreceptors and partly by α 1-adrenoreceptors, and NO may be a common mediator for their regulations.
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