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Olle Melander

Principal investigator

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Total and Differential Leukocyte Counts in Relation to Incidence of Diabetes Mellitus: A Prospective Population-Based Cohort Study.

Author

  • Yan Borné
  • Gustav Smith
  • Peter Nilsson
  • Olle Melander
  • Bo Hedblad
  • Gunnar Engström

Summary, in English

OBJECTIVE:



High concentrations of leukocytes in blood have been associated with diabetes mellitus. This prospective study aimed to explore whether total and differential leukocyte counts are associated with incidence of diabetes. A missense variant R262W in the SH2B3 (SH2B adaptor protein 3) gene, coding for a protein that negatively regulates hematopoietic cell proliferation, was also studied in relation to incidence of diabetes.

METHODS AND RESULTS:



Leukocyte count and its subtypes (neutrophils, lymphocytes and mixed cells) were analyzed in 26,667 men and women, 45-73 years old, from the population-based Malmö Diet and Cancer study. Information about the R262W polymorphism (rs3184504) in SH2B3 was genotyped in 24,489 subjects. Incidence of diabetes was studied during a mean follow-up of 14 years. Cox proportional hazards regression was used to examine incidence of diabetes by total and differential leukocyte counts. Mendelian randomization analysis using R262W as an instrumental variable was performed with two-stage least squares regression. A total of 2,946 subjects developed diabetes during the follow-up period. After taking several possible confounders into account, concentrations of total leukocyte count, neutrophils and lymphocytes were all significantly associated with incidence of diabetes. The adjusted hazard ratios (95% confidence interval; quartile 4 vs quartile 1) were 1.37 (1.22-1.53) for total leukocytes, 1.33 (1.19-1.49) for neutrophils and 1.29 (1.15-1.44) for lymphocytes. The R262W polymorphism was strongly associated with leukocytes (0.11x109 cells/l per T allele, p = 1.14 x10-12), lymphocytes (p = 4.3 x10-16), neutrophils (p = 8.0 x10-6) and mixed cells (p = 3.0 x10-6). However, there was no significant association between R262W and fasting glucose, HbA1c or incidence of diabetes.

CONCLUSIONS:



Concentrations of total leukocytes, neutrophils and lymphocytes are associated with incidence of diabetes. However, the lack of association with the R262W polymorphism suggests that the associations may not be causal, although limitations in statistical power and balancing pleiotropic effects cannot be excluded.

Department/s

  • Cardiovascular Research - Epidemiology
  • Cardiology
  • Internal Medicine - Epidemiology
  • Cardiovascular Research - Hypertension
  • Department of Clinical Sciences, Malmö
  • EXODIAB: Excellence in Diabetes Research in Sweden
  • EpiHealth: Epidemiology for Health

Publishing year

2016

Language

English

Publication/Series

PLoS ONE

Volume

11

Issue

2

Document type

Journal article

Publisher

Public Library of Science

Topic

  • Cardiac and Cardiovascular Systems
  • Endocrinology and Diabetes

Status

Published

Research group

  • Cardiovascular Research - Epidemiology
  • Internal Medicine - Epidemiology
  • Cardiovascular Research - Hypertension

ISBN/ISSN/Other

  • ISSN: 1932-6203