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Acute exposure to morphine suppresses cytotoxic T-lymphocyte activity
G W Carpenter1, L Breeden, D J Carr
1Department of Microbiology, LSU Medical Center, New Orleans 70112-1393, USA.
International Journal of Immunopharmacology
|December 1, 1995
Summary
Acute morphine exposure suppresses peritoneal cytotoxic T-lymphocyte activity, while chronic exposure does not. Opioid receptor involvement is confirmed, suggesting duration-dependent immune effects.
Area of Science:
- Immunology
- Pharmacology
- Neuroscience
Background:
- Chronic morphine exposure can suppress T-lymphocyte activity via mu-opioid receptors.
- Understanding the impact of exposure frequency on immune function is crucial.
Purpose of the Study:
- To investigate how varying frequencies of morphine exposure affect cytotoxic T-lymphocyte (CTL) activity.
- To determine the role of opioid receptors in morphine's immunomodulatory effects.
Main Methods:
- C3H/HeN mice were immunized and treated with morphine (50.0 mg/kg) acutely or subchronically.
- Splenic and peritoneal CTL activity was measured.
- Naltrexone was used to assess opioid receptor involvement.
- Column depletion chromatography identified CTL populations (CD4+CD8- and CD4-CD8+).
Main Results:
- Subchronic morphine treatment did not suppress splenic natural killer (NK) or CTL activity.
- Acute morphine administration significantly suppressed peritoneal CTL activity, but not splenic CTL activity.
- Naltrexone pretreatment blocked the acute morphine-induced suppression of peritoneal CTLs.
- Peritoneal CTLs mediating activity were identified as CD4+CD8- and CD4-CD8+.
Conclusions:
- The duration of opioid exposure differentially impacts peritoneal CTL activity.
- Acute morphine exposure suppresses peritoneal CTLs, suggesting potential risks to viral immunity in drug users.