The development of the pituitary-adrenocortical stress response was studied in CBA/J × DBA/2J hybrid mice. On the basis of the plasma corticosterone response 15 min after a subcutaneous injection of histamine dihydrochloride (50 mg/kg), the first three neonatal weeks could be divided into stress-nonresponsive (3–211 days) and stress-responsive 16–21 days) periods. During the former period, corticosterone levels in the brains of the non-stressed control mice were 63% higher than those of comparable mice during the latter period. Histamine stress significantly increased corticosterone concentrations in the brain during both these periods, but the increase was much greater (88%) during the stress-responsive period than during the stress-nonresponsive period (29%).
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