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Area of Science:

  • Hematology
  • Immunology
  • Gerontology

Background:

  • Platelets are key effector cells in vascular injury response.
  • Emerging evidence highlights platelet roles in inflammation and neurological diseases.
  • Platelet functions are particularly relevant to age-related diseases.

Purpose of the Study:

  • To review the diverse functions of platelets in aging.
  • To examine how altered platelet function contributes to age-related diseases.
  • To identify knowledge gaps in understanding aging-related platelet changes.

Main Methods:

  • Review of recent scientific literature on platelet biology in aging.
  • Analysis of molecular mechanisms underlying age-related platelet alterations.
  • Examination of platelet involvement in cardiovascular, inflammatory, and neurological diseases.

Main Results:

  • Platelet counts decrease, but reactivity increases with age.
  • Altered platelet transcriptome in aging leads to exaggerated inflammation via increased cytokines (e.g., granzyme A).
  • Platelet hyperactivity in aging is linked to increased reactive oxygen species and mTOR pathway activation, exacerbating thrombosis and inflammation in diseases like cardiovascular disease and sepsis.
  • Platelets also influence neurological diseases, including Alzheimer's disease.

Conclusions:

  • Significant advances have been made in understanding aging-related platelet molecular mechanisms.
  • Further research is needed to fill knowledge gaps regarding platelet gene expression and function in aging.
  • Identifying these mechanisms will be crucial for targeting thrombo-inflammation in older adults.