title: Relationship between cumulative effects of smoking and memory CD4+ T lymphocyte subpopulations.
abstract: Previous studies have found that smoking is a strong factor that increases peripheral blood CD4+ T lymphocytes. However, most studies did not assess the cumulative long-life exposure of smoking on differential lymphocyte populations. In this study, to clarify the association of smoking habits and circulating lymphocytes, we conducted a cross-sectional study of 60 male current smokers. Smoking status was estimated by number of cigarettes smoked per day, smoking years, and Brinkman Index (BI) as calculated by multiplying the number of cigarettes smoked per day by the smoking years. Counts of CD4+CD45RO+CD69+ T and CD4+CD45RO+ T lymphocytes were strongly and positively correlated with BI and remained highly significant after controlling for alcohol drinking, leisure-time physical activity, and caffeine intake (r(p)>.465, p<.001). These lymphocytes were also significantly correlated with the number of cigarettes smoked per day and smoking years, but the association was weaker than the BI. The findings suggest that the CD4+CD45RO+CD69+ T and CD4+CD45RO+ T lymphocytes are sensitive to cumulative effect of smoking, and may serve as a potential immuno-biomarker for active smoking.
authors.affiliation: National Institute of Occupational Safety and Health, Japan. nakataa-tky@umin.ac.jp
authors.forename: Akinori
authors.initials: A
authors.lastname: Nakata
authors.forename: Masaya
authors.initials: M
authors.lastname: Takahashi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Irie
authors.forename: Yosei
authors.initials: Y
authors.lastname: Fujioka
authors.forename: Takashi
authors.initials: T
authors.lastname: Haratani
authors.forename: Shunichi
authors.initials: S
authors.lastname: Araki
mesh_terms: D000328:Adult; D000368:Aged; D000911:Antibodies, Monoclonal / Q000276:immunology; D015704:CD4 Antigens / Q000276:immunology*; D003430:Cross-Sectional Studies; D006184:Habits; D006801:Humans; D016131:Lymphocyte Subsets / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D012907:Smoking / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D015704:CD4 Antigens