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Spontaneous and induced interferon production by peripheral blood mononuclear leukocytes from humans with herpes
Abstract:
Peripheral blood mononuclear leukocytes (PBML) were obtained from 44 individual human subjects within 1 to 66 days after the onset of an episode of recurrent herpes labialis. PBML did not spontaneously produce interferon (IFN) when maintained in cultures that contained medium only. Absence of detectable IFN could not be explained by delayed kinetics of production because no appreciable IFN was present in medium from 5-day-old cultures. IFN was produced when PBML were exposed to Newcastle's disease virus or to phytohemagglutinin. These findings suggest that spontaneous IFN production may not occur predictably after an episode of herpes labialis.
Insights
Peripheral blood mononuclear leukocytes (PBML) from herpes labialis patients did not spontaneously produce interferon (IFN). However, PBML did produce IFN when stimulated with viruses or phytohemagglutinin, suggesting unpredictable spontaneous IFN production post-herpes labialis.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- Recurrent herpes labialis is a common viral infection.
- Interferon (IFN) plays a crucial role in antiviral immunity.
- Understanding IFN production post-infection is vital for immune response studies.
Purpose of the Study:
- To investigate spontaneous interferon (IFN) production by peripheral blood mononuclear leukocytes (PBML) after herpes labialis episodes.
- To determine if PBML can produce IFN when stimulated exogenously after infection.
Main Methods:
- Collected PBML from 44 human subjects 1-66 days post-herpes labialis onset.
- Cultured PBML in medium alone to assess spontaneous IFN production.
- Stimulated PBML with Newcastle's disease virus and phytohemagglutinin to assess induced IFN production.
- Measured IFN levels in culture supernatants.
Main Results:
- PBML did not spontaneously produce detectable levels of IFN in unstimulated cultures.
- No significant IFN was detected even in 5-day-old cultures, ruling out delayed kinetics.
- PBML successfully produced IFN upon stimulation with Newcastle's disease virus.
- Phytohemagglutinin stimulation also induced IFN production in PBML.
Conclusions:
- Spontaneous interferon production by PBML may not be a predictable immune response following herpes labialis.
- PBML retain the capacity to produce IFN when appropriately stimulated after herpes labialis.
- Further research is needed to elucidate the precise mechanisms and timing of IFN responses in recurrent herpes labialis.