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Assessment of Vascular Function in Patients With Chronic Kidney Disease
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Aging-related kidney damage is associated with a decrease in klotho expression and an increase in superoxide

Zhong Zuo1, Han Lei, Xiuqing Wang

  • 1Department of Cardiology, the First Affiliated Hospital, Chongqing Medical University, Chongqing, China.

Age (Dordrecht, Netherlands)
|September 11, 2010
PubMed
Summary

Aging exacerbates kidney damage, particularly in rats with cognitive impairment. Key proteins like klotho and MnSOD decrease, while others like IL-6 and Nox2 increase, worsening renal function.

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Area of Science:

  • Nephrology
  • Gerontology
  • Neuroscience

Background:

  • Aging is associated with progressive kidney damage and altered protein expression.
  • Cognitive impairment is increasingly recognized in aging populations, with potential systemic health implications.
  • Kidney function and cognitive health are interconnected, but the specific molecular changes in aging kidneys with cognitive decline are not fully understood.

Purpose of the Study:

  • To investigate changes in klotho, endothelin (ET) receptors, and superoxide production in the kidneys of aged rats.
  • To determine if these renal changes are exacerbated in aged rats exhibiting cognitive impairment.
  • To explore the molecular mechanisms underlying age-related kidney damage and its link to cognitive decline.

Main Methods:

  • Comparison of renal tissue and serum markers in young intact rats, aged intact rats, and aged rats with cognitive impairment.
  • Assessment of kidney function using serum creatinine levels.
  • Histopathological examination for glomerulosclerosis and tubulointerstitial fibrosis.
  • Quantification of protein expression for klotho, IL-6, Nox2, ETa receptors, ETb receptors, and MnSOD.
  • Measurement of superoxide production.

Main Results:

  • Aged rats, especially those with cognitive impairment, exhibited increased serum creatinine, glomerulosclerosis, and tubulointerstitial fibrosis.
  • Significant downregulation of klotho, ETb receptors, and MnSOD was observed in aged rat kidneys.
  • Upregulation of IL-6, Nox2, ETa receptors, and superoxide production occurred in aged rat kidneys.
  • These molecular and pathological changes were more pronounced in aged rats with cognitive impairment compared to aged rats without impairment.

Conclusions:

  • Aging-related kidney damage is significantly exacerbated by cognitive impairment in rats.
  • The study identifies specific molecular players, including downregulated klotho, ETb, and MnSOD, and upregulated ETa, IL-6, Nox2, and superoxide, implicated in this exacerbated renal damage.
  • These findings highlight a critical link between kidney health and cognitive function during aging, suggesting potential therapeutic targets.