Abstract
Immunosenescence is the age-related changes in the immune system, namely, progressively higher levels of circulating inflammatory markers, characteristics changes of circulating immune subset cells and altered immune function. The neutrophil to lymphocyte ratio (NL ratio) has been identified as a prognostic indicator for neoplastic disease progression, in predicting chronic degenerative diseases, and as a potential indirect marker of healthy aging. This study aims to examine the longitudinal association of neutrophil, lymphocyte absolute count, and their ratio with longitudinal risk for multimorbidity and mortality. The Baltimore Longitudinal Study of Aging (BLSA) is an open observational cohort study of community-dwelling volunteers that are followed every 1–4 years depending on their age. The sample considered in the study consists of 1769 participants (5090 follow-ups) with completed data for physical examination, health history assessment, and donated a blood sample. The NL ratio increased with age and was associated with a higher risk of mortality, while a lower NL ratio was inversely correlated with multimorbidity. Neutrophils increased with aging and an increase in their absolute number predicted mortality risk. However, the absolute number of lymphocytes was associated with age only in a cross-sectional analysis. In conclusion, this study supports the importance of the NL ratio and absolute neutrophil count as markers of aging health status, and as significant predictors of all-cause mortality and multimorbidity in aging individuals. It remains to be demonstrated whether interventions contrasting these trends in circulating cells may result in improved health outcomes.
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Data availability
Data from Baltimore Longitudinal Study of Aging are available through submission of research proposal through https://www.blsa.nih.gov/ (accessed on 01/02/2024).
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Funding
This work was supported in part by the National Institutes of Health (NIH) and the Intramural Research Program (Grant ID: Z01 AG000015-49).
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Raffaello Pellegrino: conceptualization, interpretation of data, drafted the work. Roberto Paganelli: conceptualization, interpretation of data, drafted and revised the work. Angelo Di Iorio: conceptualization, acquisition, analysis, drafted the work. Stefania Bandinelli: design of the work, interpretation of data, revised the work. Antimo Moretti: analysis, interpretation of data, drafted the work. Giovanni Iolascon: analysis, interpretation of data, drafted the work. Eleonora Sparvieri: acquisition, analysis, interpretation of data, drafted the work. Domiziano Tarantino: acquisition, analysis, interpretation of data, drafted the work. Toshiko Tanaka: acquisition, analysis, interpretation of data, revised the text. Luigi Ferrucci: design, acquisition, analysis, interpretation of data, revised the text. All authors have read and agreed to the present version of the manuscript.
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The BLSA study protocol was approved by the Internal Review Board (IRB) of the National Institutes of Health and all participants provided written informed consent (Protocol number 03-AG-0325). The study was conducted in accordance with the Declaration of Helsinki.
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Written informed consent was obtained from the subjects to participate at the Study at each time (baseline visit and follow-ups).
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The authors (Raffaello Pellegrino; Roberto Paganelli; Angelo Di Iorio; Stefania Bandinelli; Antimo Moretti; Giovanni Iolascon; Eleonora Sparvieri; Domiziano Tarantino; Toshiko Tanaka; Luigi Ferrucci) declare no conflict of interest.
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11357_2023_1034_MOESM1_ESM.docx
γ00 = intercept of the average trajectory; γ01= intercept of the trajectory for age; γ02= intercept of the trajectory for sex; γ03= intercept of the trajectory for multimorbidity; γ04= intercept of the trajectory for death; γ05= intercept of the trajectory for body mass index; γ061= intercept of the trajectory for black race; γ062= intercept of the trajectory for other races; γ10 = slope of the average trajectory; δ2ε = within person variance components; δ20 = in initial status variance components; δ21 = in rate of change variance components; δ01 = covariance estimate; ρ = Intraclass correlation coefficinet; R2 y,y1pseudo-R2; AIC = Akaike information criterion. *** p<0.001; ** p = 0.01; * p = 0.05 (DOCX 51.9 KB)
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Pellegrino, R., Paganelli, R., Di Iorio, A. et al. Neutrophil, lymphocyte count, and neutrophil to lymphocyte ratio predict multimorbidity and mortality—results from the Baltimore Longitudinal Study on Aging follow-up study. GeroScience 46, 3047–3059 (2024). https://doi.org/10.1007/s11357-023-01034-7
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DOI: https://doi.org/10.1007/s11357-023-01034-7