Abstract
Inflammation is a key event that is closely associated with the pathophysiology of frailty. The relationship of genetic polymorphisms into inflammatory cytokines with frailty remains poorly understood. The aim of this study was to investigate the association between VNTR polymorphisms of the IL-4 and IL-1RN genes with the risk of frailty. We included a sample of 630 community-dwelling elderly aged 70 and older. Both IL-4 and IL-1RN VNTR polymorphisms were genotyped by the polymerase chain reaction (PCR) method. Mean age was 77.7 years (SD = 6.0) and 52.5 % were women. The participants classified as frail were more likely to be older, had lower MMSE score (p < 0.001), and had more disability for IADL (p < 0.001) and ADL (p < 0.001). Genotypic and allelic frequencies for the IL-4 VNTR polymorphism did not show significant differences between study groups (p > 0.05). However, we just observed a significant difference in the allelic frequencies for the A2 allele of the IL-1RN VNTR polymorphism between frail and nonfrail groups (OR 1.84, 95 % CI 1.08–3.12, p = 0.02). In addition, we analyzed the combined effect of the IL-4 and IL-1RN VNTR polymorphisms and their possible association with frailty, where the combined IL-4 low–IL-1Ra high genotype was identified as a marker of risk to frailty syndrome (OR 7.86, 95 % CI 1.83–33.69, p = 0.006). Our results suggest that both A2 allele and the combined IL-4 low–IL-1Ra high genotype might be genetic markers of susceptibility to frailty in Mexican elderly.
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Acknowledgments
The authors greatly appreciate the participation in this study of Jesús Lázaro López-Vázquez, laboratory assistant.
Funding
This study was supported by the National Institute of Geriatrics under the Grant Agreement No. DI-PI-003/2012.
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The “Coyoacan Cohort” study protocol and the informed consent format were approved by the Ethical Committees of the Instituto Nacional de Ciencias Médicas y Nutrición “Salvador Zubirán” (INCMNSZ) and the Instituto Nacional de Salud Pública (INSP) of Mexico City. Likewise, the study protocol and informed written consent for genetic studies were approved by the Ethical and Research Committees of the Instituto Nacional de Geriatría of Mexico City, and the study was performed according to the ethical guidelines of the Declaration of Helsinki.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Pérez-Suárez, T.G., Gutiérrez-Robledo, L.M., Ávila-Funes, J.A. et al. VNTR polymorphisms of the IL-4 and IL-1RN genes and their relationship with frailty syndrome in Mexican community-dwelling elderly. Aging Clin Exp Res 28, 823–832 (2016). https://doi.org/10.1007/s40520-015-0503-4
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DOI: https://doi.org/10.1007/s40520-015-0503-4