Abstract
The increase in mouse serum interferon that occurs in response to poly I:C administration is markedly attenuated by injection of a narcotic preceding the polynucleotide challenge. A single injection of morphine is capable of inhibiting the mechanism(s) responsible for increasing serum interferon levels for a period of at least 9 days following the narcotic injection. Daily single injections of morphine for 5 or 10 days prior to poly I:C challenge do not amplify the extent of the decrease in serum interferon over that measured for a single injection, even though the amount of narcotic injected is increased on each successive day of the 5 or 10 day period. The implications of this relationship for the phenomenon of narcotic tolerance are evaluated and discussed as they relate to the immune processes.
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