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Systematic expression profiling of innate immune genes defines a complex pattern of immunosenescence in peripheral and intestinal leukocytes

Abstract

Immunosenescence is characterized by a quantitative decline of adequate immune responses, which renders the elderly individual particularly susceptible to bacterial, viral and fungal pathogens. Whereas changes of the aging adaptive immune system (for example, reduced immunoglobulin secretion) have been extensively characterized, alterations of the innate immune system are still poorly understood. The aim of the present study was to systematically examine mRNA expression levels of innate immune genes and proinflammatory cytokines in peripheral and intestinal leukocytes of subjects of different ages. In both, whole blood samples and in colonic biopsies most of the Toll-like receptors (TLRs) and nucleotide-binding and oligomerization domain-like receptors (NLRs) transcript levels were significantly downregulated in elderly subjects (90–99 years). Older individuals, when compared to the younger, exhibited an increased expression and/or secretion of proinflammatory cytokines by peripheral and intestinal leukocytes as well as an increased level of nuclear factor-κB activation in colonic biopsies. The observed downregulation of TLRs and NLRs during the aging process may contribute to the lack of effective recognition of invading pathogens or the commensal flora. This effect results in aberrant secondary immune cell activation and could significantly contribute to morbidity and mortality at advanced age.

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Acknowledgements

We thank Dorina Oelsner, Tanja Kaacksteen and the study group PopGen for their technical assistance. This work was supported by grants from the Deutsche Forschungsgemeinschaft (SFB 617) and the National Genome Research Network (NGFN) from the German Ministry for Education and Research (BMBF) and the GeHA project from the FP6 program of the European Union. The funding sources had no influence on study design; collection, analysis and interpretation of data; writing of the paper and decision to submit it for publication.

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Correspondence to S Schreiber.

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Authors' contributions: PR, SD, AN and SS designed the study. SD, SN, BB, HE and SS were involved in the recruitment and collection of samples. SD and SN performed all laboratory work. SD, SN, PR and RH performed data analysis. Interpretation of data and writing of the manuscript were done by PR, SD and AN. SS proofread the manuscript prior to submission.

Conflict of interest

All authors have read and approved of the contents of the manuscript and none of the authors have competing financial interests. There is no significant overlap between the submitted paper and any other papers from the same authors under consideration or in press elsewhere.

Supplementary Information accompanies the paper on Genes and Immunity website (http://www.nature.com/gene)

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Rosenstiel, P., Derer, S., Till, A. et al. Systematic expression profiling of innate immune genes defines a complex pattern of immunosenescence in peripheral and intestinal leukocytes. Genes Immun 9, 103–114 (2008). https://doi.org/10.1038/sj.gene.6364454

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