Related Experiment Videos

Loss of transcription factor AP-1 DNA binding activity during lymphocyte aging in vivo

E Sikora1, B Kamińska, E Radziszewska

  • 1Department of Cellular Biochemistry, Nencki Institute of Experimental Biology, Warsaw, Poland.

FEBS Letters
|November 9, 1992
PubMed

Insights

Cellular senescence halts cell proliferation. In old mice, lymphocytes showed reduced c-fos expression and AP-1 transcription factor formation, impacting DNA synthesis.

Area of Science:

  • Cellular biology
  • Immunology
  • Aging research

Background:

  • Cellular senescence is characterized by irreversible cell cycle arrest.
  • Protooncogene c-fos is crucial for initiating DNA synthesis.
  • AP-1 is a transcription factor complex of c-Fos and c-Jun proteins.

Purpose of the Study:

  • To investigate the expression of c-fos and the formation of the AP-1 transcription factor in lymphocytes from aged mice.
  • To compare these molecular changes with those in lymphocytes from young mice.

Main Methods:

  • Lymphocytes were isolated from old (> 18 months) and young mice.
  • Cells were stimulated with Concanavalin A (Con A).
  • Expression levels of c-fos and c-jun, and formation of AP-1 were analyzed.

Main Results:

  • Senescent fibroblasts exhibit repressed c-fos expression.
  • Lymphocytes from old mice showed diminished c-fos expression and impaired AP-1 formation after Con A stimulation.
  • No significant differences were observed in c-jun expression or the formation of AP-2 and AP-3 transcription factors between old and young mice.

Conclusions:

  • Reduced c-fos expression and impaired AP-1 formation in aged lymphocytes may contribute to age-related immune dysfunction.
  • These findings highlight specific molecular alterations associated with aging in immune cells.

Related Concept Videos