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 Nω-nitro--arginine methyl ester (-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 -NAME.
- 6. 5. These data suggest that BAT blood flow as well as thermogenesis is regulated mainly by β-adrenoreceptors and partly by α1-adrenoreceptors, and NO may be a common mediator for their regulations.
|