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Related Experiment Video

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Age-Related Changes to Human Tear Composition.

Alessandra Micera1, Antonio Di Zazzo2, Graziana Esposito1

  • 1Research Laboratories in Ophthalmology, IRCCS-G.B. Bietti Foundation, Rome, Italy.

Investigative Ophthalmology & Visual Science
|April 21, 2018
PubMed
Summary
This summary is machine-generated.

Tear protein profiles change with age, with increased levels of inflammatory mediators like Interleukin-8 (IL-8) and Interleukin-6 (IL-6), and tissue remodeling factors such as Matrix Metalloproteinase-1 (MMP-1). These findings may aid in developing new diagnostics for age-related eye conditions.

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Author Spotlight: Isolating Biomolecules from Mouse Tears — A Methodology for Molecular Analysis and Biomarker Research
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Area of Science:

  • Ophthalmology
  • Immunology
  • Gerontology

Background:

  • Age-associated changes in ocular surface health are common.
  • Understanding molecular alterations in tears is crucial for diagnosing and treating age-related eye conditions.

Purpose of the Study:

  • To characterize age-related changes in the expression of inflammatory mediators and tissue remodeling factors in human tears.
  • To identify specific proteins in tears that correlate with aging.

Main Methods:

  • Tear samples were collected from 75 volunteers across three age groups (young, middle-aged, old).
  • Protein profiles were analyzed using chip-based arrays to assess 60 potential candidates.
  • Validated findings using Western blot and ELISA assays.

Main Results:

  • Nine proteins showed significant correlation with age.
  • Levels of Interleukin-8 (IL-8), Interleukin-6 (IL-6), Regulated on Activation, Normal T Cell Expressed and Secreted (RANTES), Matrix Metalloproteinase-1 (MMP-1), and Tumor Necrosis Factor-alpha (TNF-α) increased with age.
  • Macrophage Inflammatory Protein-3 beta (MIP-3β) showed a decrease with age.

Conclusions:

  • Tear protein composition dynamically changes with aging.
  • Elevated IL-8, IL-6, RANTES, MMP-1, and MIP-3β in tears are associated with aging.
  • These age-related tear factors may inform the development of diagnostic tools and therapeutics for ocular surface diseases.