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Area of Science:

  • Neuroscience
  • Aging Research
  • Immunology

Background:

  • Chronic inflammation is linked to biological aging.
  • The pineal gland influences the body's internal clock.
  • Neuroinflammation plays a role in age-related cognitive decline.

Purpose of the Study:

  • To investigate pinealectomy-induced neuroinflammation in the rat hippocampus.
  • To determine how age affects the severity of this inflammation.
  • To explore the role of the Akt/NF-kB pathway and gliosis in age-dependent neuroinflammation.

Main Methods:

  • Rats of different ages (3, 14, 18 months) underwent sham surgery or pinealectomy.
  • Immunohistochemistry was used to assess Akt/NF-kB signaling and gliosis in the dorsal hippocampus.
  • Neuronal and glial responses were analyzed across age groups.

Main Results:

  • Pinealectomy increased NF-kB expression in young and middle-aged rats, with age-specific changes in pAkt1.
  • Microgliosis occurred in young and old rats, but middle-aged rats were resistant.
  • Astrogliosis was observed in young and middle-aged rats, with young rats showing highest vulnerability to inflammation due to melatonin loss.

Conclusions:

  • Neuroinflammation following pinealectomy is dynamic and age-dependent.
  • The developmental stage is critical in determining susceptibility to inflammation after melatonin loss.
  • Findings highlight the complex interplay between aging, pineal function, and neuroinflammation.