Abstract
1. 1. Either cold (5°C) or heat (33°C) exposure for 24 h did not affect the number and affnity of β-adrenergic receptor in rat white adipocyte. 2. 2. Cold acclimation (5°C, 4 weeks) significantly decreased the number of β-adrenergic receptor sites, while heat acclimation (33°C, 4 weeks) significantly increased it. 3. 3. Affinity of β-adrenergic receptor binding sites for noradrenaline was not significantly different among the control, cold- and heat-acclimated animals. 4. 4. The changes of β-adrenergic receptor in temperature acclimation could not explain the changes in the metabolic responsiveness to noradrenaline in temperature-acclimated animals.
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