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Aging-induced alterations in female rat colon smooth muscle: the protective effects of hormonal therapy

P Pascua1, C Camello-Almaraz, M J Pozo

  • 1Department of Physiology, Nursing School, University of Extremadura, 10071 Caceres, Spain.

Journal of Physiology and Biochemistry
|December 15, 2011
PubMed

Insights

Aging causes oxidative damage and inflammation in colonic smooth muscle. Hormonal therapy with melatonin or estrogen protected against these age-related changes in female rats.

Area of Science:

  • Gerontology
  • Gastroenterology
  • Cellular Biology

Background:

  • Aging is linked to oxidative stress and inflammation, impacting hormone secretion like melatonin and estrogen.
  • Mechanisms of smooth muscle aging, particularly in the colon, remain incompletely understood.

Purpose of the Study:

  • To investigate aging-induced changes in colonic smooth muscle of female rats.
  • To evaluate the protective effects of melatonin and estrogen therapy on aged colonic smooth muscle.

Main Methods:

  • Comparative study using young, aged, and ovariectomized aged female rats.
  • Hormonal therapy with melatonin or estrogen administered to ovariectomized aged rats for 10 weeks.
  • Assessment of oxidative stress markers (H2O2, lipid peroxidation, catalase activity), inflammation (cyclooxygenase 2), and apoptosis (caspases 3 and 9).

Main Results:

  • Aging induced significant oxidative imbalance, characterized by increased H2O2, lipid peroxidation, and reduced catalase activity.
  • Ovariectomy exacerbated oxidative damage in aged colonic muscle.
  • Enhanced expression of cyclooxygenase 2 and activated caspases 3 and 9 was observed in aged colonic smooth muscle.
  • Melatonin and estrogen treatments effectively prevented oxidative damage and caspase activation.

Conclusions:

  • Colonic smooth muscle aging is associated with oxidative imbalance and activation of pro-inflammatory and apoptotic pathways.
  • Hormonal therapy, specifically with melatonin and estrogen, demonstrates beneficial effects in mitigating age-related oxidative and apoptotic changes in this rat model.

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