Nasal Immune Cells and Smoking: How Smoking Affects Immune Responses to Influenza
Author Information
Author(s): Katherine M. Horvath, Margaret Herbst, Haibo Zhou, Hongtao Zhang, Terry L. Noah, Ilona Jaspers
Primary Institution: The University of North Carolina at Chapel Hill
Hypothesis
Smoking alters the function of natural killer cells in nasal secretions, affecting susceptibility to respiratory viruses.
Conclusion
Natural killer cell function is suppressed in smokers after exposure to the live attenuated influenza virus.
Supporting Evidence
- Natural killer cells are a significant immune cell type in nasal lavage fluid.
- Smokers showed suppressed increases in cytotoxic NK cell percentages after influenza exposure.
- Granzyme B activity was significantly lower in smokers compared to nonsmokers after LAIV inoculation.
Takeaway
Smokers have weaker immune responses in their noses when they get the flu, which might make them more likely to get sick.
Methodology
The study used flow cytometry to analyze immune cells in nasal lavage fluid from smokers and nonsmokers before and after inoculation with live attenuated influenza virus.
Potential Biases
Potential bias due to self-reported smoking status and the exclusion of certain demographics.
Limitations
The study had a small sample size and some subjects dropped out, which may affect the results.
Participant Demographics
Healthy young adults aged 18-35, including 13 nonsmokers and 13 smokers.
Statistical Information
P-Value
0.09
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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