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Cells with natural killer activity in human rabies
T Panpanich1, T Hemachudha, S Piyasirisilp
1Queen Saovabha Memorial Institute, Thai Red Cross Society, Bangkok.
Clinical and Experimental Immunology
|September 1, 1992
Summary
Natural killer (NK) cells in rabies patients show reduced stimulation, potentially increasing rabies virulence. Further research is needed to understand this immune response in cytotoxic lymphocyte function.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- Rabies is a fatal viral disease affecting the central nervous system.
- Cytotoxic lymphocyte function, particularly natural killer (NK) cell activity, plays a crucial role in antiviral immunity.
Purpose of the Study:
- To investigate the functional status of NK cells in patients with rabies.
- To compare NK cell numbers and activity between rabies patients and healthy controls.
Main Methods:
- Quantified CD56+ cells (a marker for NK cells) in peripheral blood.
- Assessed baseline NK cell activity against K562 target cells.
- Evaluated NK cell response after stimulation with interferon-alpha (IFN-α) and IL-2.
Main Results:
- No significant difference in CD56+ cell counts or baseline NK cell activity was observed between rabies patients and normal controls.
- Significant enhancement of NK cell activity post-IFN-α and IL-2 stimulation was observed in some rabies patients, but less consistently than in controls.
- Patients with non-rabies encephalitis showed varied NK cell responses.
Conclusions:
- NK cells in rabies patients appear to be hyporesponsive or not fully stimulated.
- This impaired NK cell function may contribute to the pathogenesis and virulence of rabies.
- The underlying cause for the reduced NK cell responsiveness in rabies remains undetermined.