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Altered cellular responsiveness during ageing.

S I Rattan1, A Derventzi

  • 1Department of Chemistry, Aarhus University, Denmark.

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|November 1, 1991
PubMed
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Cellular ageing impairs the ability to respond to stimuli and maintain stability. Metabolic defects, not receptor issues, likely cause this reduced responsiveness and increased sensitivity to toxins in aging cells.

Area of Science:

  • Cellular Biology
  • Gerontology
  • Biochemistry

Background:

  • Cellular ageing is characterized by a declining capacity to respond to external stimuli and maintain homeostasis.
  • This decline affects survival and involves reduced responses to growth factors and hormones.
  • Aging cells exhibit increased sensitivity to various toxic agents.

Purpose of the Study:

  • To investigate the underlying mechanisms of altered cellular responsiveness during ageing.
  • To determine if receptor system defects or metabolic pathway alterations are responsible for impaired homeostasis in aging cells.

Main Methods:

  • The study focused on analyzing cellular responses to various stimuli and toxic agents in the context of ageing.
  • Investigated potential defects in receptor systems and macromolecular synthesis pathways.

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Main Results:

  • Cellular responsiveness to mitogenic and stimulatory agents significantly decreases with age.
  • Aging cells show heightened sensitivity to toxins like antibiotics, phorbol esters, radiation, and heat shock.
  • No significant quantitative or qualitative defects were found in receptor systems.

Conclusions:

  • The failure of homeostasis during cellular ageing is not attributed to receptor system defects.
  • Metabolic defects within macromolecular synthesis pathways are proposed as the primary cause of altered cellular responsiveness in ageing.