The tumor necrosis factor alpha - 308G>A polymorphism is associated with dementia in the oldest-old.

Helle Bruunsgaard, Thomas L Benfield, Karen Andersen-Ranberg, Jacob v B Hjelmborg, Agnes N Pedersen, Marianne Schroll, Bente K Pedersen, Bernard Jeune

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

OBJECTIVES: To test the hypothesis that the tumor necrosis factor (TNF) -308 G>A promoter gene polymorphism is a risk factor in age-related dementia and longevity. DESIGN: A cross-sectional and a longitudinal study. SETTING: A population-based sample of Danish centenarians. PARTICIPANTS: One hundred-year-old Danes (n=122) from "The Longitudinal Study of Danish Centenarians." Octogenarians (n=174) and healthy volunteers aged 18 to 30 (n=47) served as reference groups. METHODS: Whether the distribution of TNF -308 GG/GA/AA genotypes were different in centenarians than in younger age groups was investigated (Fischer exact test). Furthermore, whether the TNF -308 G>A polymorphism was associated with the prevalence of dementia (logistic regression analysis), the plasma level of TNF-alpha (analysis of variance), and mortality in the following 5 years (Cox regression analysis) within the cohort of centenarians was tested. RESULTS: The distribution of TNF -308 genotypes was not different across the three different age groups, but the GA genotype was associated with decreased prevalence of dementia in centenarians. The few centenarians with AA carrier status had higher mortality risk and tended to show higher plasma levels of TNF-alpha, but the significance was questionable due to a low number of subjects with this genotype. CONCLUSION: It is possible that the TNF -308 A allele is maintained during aging because subjects who are heterozygous for this polymorphism possess the optimal inflammatory response with regard to protection against age-related neurodegeneration.
Original languageEnglish
JournalJournal of the American Geriatrics Society
Volume52
Issue number8
Pages (from-to)1361-1366
Number of pages5
ISSN0002-8614
DOIs
Publication statusPublished - 2004

Keywords

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Cross-Sectional Studies
  • Dementia
  • Female
  • Genotype
  • Humans
  • Longitudinal Studies
  • Male
  • Polymorphism, Genetic
  • Regression Analysis
  • Tumor Necrosis Factor-alpha

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