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Morphine reduces pulmonary inflammation in response to influenza infection
M E Coussons-Read1, M Daniels, M I Gilmour
1Department of Psychology, University of Colorado at Denver 80217, USA. mcousson@carbon.cudenver.edu
Abstract:
The present study shows that morphine reduces the pulmonary inflammatory response to intranasal influenza virus infection in rats. Rats were infected with rat-adapted influenza virus (RAIV), which is a unique infectious agent because normal rats develop an acute pulmonary inflammatory response to RAIV and rapidly clear the virus within a few days with no mortality. Male Lewis rats were implanted with 75 mg morphine pellets or placebo pellets 72 hours prior to intranasal RAIV infection. Rats were euthanized at 2, 24, 48, 72, and 96 hours after infection. Assessment of inflammation included accumulation of inflammatory cells in the lungs, lung weight, and protein and LDH content of bronchial alveolar lavage fluid (BALF). Placebo-treated rats showed a marked inflammatory response to RAIV infection, and morphine-treated rats mounted less vigorous inflammatory responses to the infection. Taken together, these data suggest that morphine treatment impairs the inflammatory response to RAIV infection in the lungs, which is consistent with prior work demonstrating that morphine is a potent anti-inflammatory agent in other areas of the body.
Insights
Morphine treatment was found to reduce lung inflammation in rats infected with influenza virus. This study suggests morphine acts as an anti-inflammatory agent, mitigating the pulmonary response to respiratory viral infections.
Area of Science:
- Immunology
- Pharmacology
- Virology
Background:
- Influenza virus infections can trigger significant pulmonary inflammation.
- Morphine is recognized for its potent anti-inflammatory properties in various bodily systems.
Purpose of the Study:
- To investigate the effect of morphine on the pulmonary inflammatory response to intranasal influenza virus infection in rats.
- To determine if morphine's known anti-inflammatory effects extend to respiratory viral infections.
Main Methods:
- Male Lewis rats were administered morphine or placebo pellets 72 hours before intranasal inoculation with rat-adapted influenza virus (RAIV).
- Inflammatory markers including lung inflammatory cell accumulation, lung weight, and protein and lactate dehydrogenase (LDH) levels in bronchoalveolar lavage fluid (BALF) were assessed at multiple time points post-infection.
Main Results:
- Rats infected with RAIV exhibited a pronounced pulmonary inflammatory response.
- Morphine-treated rats demonstrated a significantly reduced inflammatory response compared to placebo-treated controls.
- These findings indicate morphine treatment attenuated the inflammatory cascade in the lungs following viral infection.
Conclusions:
- Morphine effectively reduces the pulmonary inflammatory response to influenza virus infection in a rat model.
- The study supports the role of morphine as an anti-inflammatory agent in the context of respiratory viral infections.
- Further research may explore the therapeutic potential of morphine in managing lung inflammation during viral infections.