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Area of Science:

  • Immunology
  • Human Physiology
  • Genetics

Background:

  • Immune response variability is influenced by age, sex, and genetics.
  • Factors driving differences in cytokine secretion, critical for host defense, are not well understood.

Purpose of the Study:

  • To identify key variables contributing to individual differences in cytokine secretion.
  • To investigate the distinct short- and long-term effects of smoking on immune responses.

Main Methods:

  • Analysis of 136 potential variables influencing immune response.
  • Assessment of cytokine secretion patterns in relation to various factors.
  • Investigation of epigenetic modifications associated with past smoking.

Main Results:

  • Smoking, cytomegalovirus (CMV) latent infection, and body mass index (BMI) were identified as major contributors to cytokine response variability, comparable to age, sex, and genetics.
  • Smoking affects both innate and adaptive immunity; innate response effects are transient post-cessation and linked to CEACAM6, while adaptive effects persist due to epigenetic memory.
  • Past smoking effects correlate with DNA methylation patterns in signal-activators and metabolism regulators.

Conclusions:

  • Identified smoking, CMV infection, and BMI as novel significant factors in cytokine secretion variability.
  • Demonstrated distinct short-term and long-term regulatory roles of smoking in immune responses.
  • Findings suggest potential clinical implications for infection, cancer, and autoimmune disease risk.