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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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The middle ear immune defense changes with age.

Michelle Christine Nielsen1, Morten Friis2, Tomas Martin-Bertelsen3

  • 1Department of Otorhinolaryngology, Head and Neck Surgery and Audiology, Copenhagen University Hospital Rigshospitalet, 2100, Copenhagen, Denmark. mcras@hotmail.com.

European Archives of Oto-Rhino-Laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery
|January 8, 2015
PubMed
Summary
This summary is machine-generated.

The middle ear

Keywords:
Age relatedImmune systemMicroarray analysisMiddle earRat bulla

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Area of Science:

  • Immunology
  • Otolaryngology
  • Genetics

Background:

  • Otitis media is common in children but rare and complicated in adults.
  • Age-related differences in pathogen exposure, Eustachian tube anatomy, and immune responses may explain this discrepancy.
  • The genetic underpinnings of age-related changes in the middle ear mucosal immune system are not well understood.

Purpose of the Study:

  • To investigate the relationship between age and the middle ear's mucosal immune system.
  • To identify age-related changes in immune-related gene expression in the middle ear mucosa.
  • To test the hypothesis that middle ear immune genes change with age.

Main Methods:

  • Utilized complementary DNA (cDNA) microarray technology to compare gene expression.
  • Analyzed immune-related genes in the middle ear mucosa of young (10-day-old) and adult (80-day-old) rats.
  • Employed bioinformatics tools for data analysis.

Main Results:

  • Identified 260 age-related genes, with 51 specifically involved in the middle ear mucosal immune system.
  • Found upregulation of innate immune genes (e.g., alpha-defensin, S100A9, S100A8) in young rats.
  • Observed upregulation of adaptive immune genes (e.g., CD3, ZAP70, LAT) in adult rats.

Conclusions:

  • The middle ear's mucosal immune system exhibits significant changes with age.
  • Innate immunity genes are more active in young rats, while adaptive immunity genes are more active in adult rats.
  • These age-related immune shifts may influence otitis media susceptibility and complications.