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Intrathecal morphine suppresses immune function in rats with inflammatory-induced pain.
1Department of Anaesthesiology, Xiangya Hospital, Xiangya Medical College, Central South University, Changsha, China.
The Journal of International Medical Research
|September 29, 2007
Summary
Chronic intrathecal morphine suppresses immune function in rats with inflammatory pain. This includes reduced natural killer cell activity and T lymphocyte function, suggesting cautious use in immunocompromised patients.
Area of Science:
- Immunology
- Pharmacology
- Pain Management
Background:
- Systemic morphine administration is known to suppress immune function.
- The impact of chronic intrathecal (IT) morphine on immune function during inflammatory pain remains unclear.
Purpose of the Study:
- To investigate the effects of chronic IT morphine on immune function in a rat model of formalin-induced inflammatory pain.
Main Methods:
- Rats received chronic lumbar IT administration of saline or varying doses of morphine for 7 days.
- Formalin-induced inflammatory pain was induced, and pain intensity was assessed.
- Spleens were harvested for immune function assays, including natural killer cell activity and T lymphocyte proliferation and subset analysis.
Main Results:
- IT morphine produced a dose-dependent analgesic effect.
- Natural killer cell activity and T lymphocyte function were suppressed by IT morphine in a dose-dependent manner.
- Flow cytometry revealed a dose-dependent decrease in T lymphocyte function and subset percentages.
Conclusions:
- Chronic IT morphine administration suppresses immune function, specifically natural killer cell and T lymphocyte activity, in the context of inflammatory pain.
- Caution is advised when using chronic IT morphine for pain management in potentially immunocompromised individuals.
