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Klotho upregulation by rapamycin protects against vascular disease in CKD

Takayuki Hamano1

  • 1Department of Comprehensive Kidney Disease Research, Osaka University Graduate School of Medicine, Osaka, Japan.

Kidney International
|October 1, 2015
PubMed

Insights

Phosphate-activated mTOR signaling in vascular smooth muscle cells (VSMCs) downregulates Klotho, promoting medial arterial calcification. Rapamycin halts this calcification, suggesting potential for treating atherosclerosis and medial calcification.

Area of Science:

  • Vascular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Medial arterial calcification is characterized by chondrogenic/osteogenic transdifferentiation of vascular smooth muscle cells (VSMCs).
  • Phosphate is a key factor implicated in vascular calcification processes.

Purpose of the Study:

  • To investigate the role of the mammalian target of rapamycin (mTOR) cascade in phosphate-induced medial arterial calcification.
  • To explore the relationship between mTOR signaling, Klotho, and vascular calcification.

Main Methods:

  • Utilized VSMCs to study the effects of phosphate and rapamycin.
  • Assessed Klotho expression and medial calcification in response to mTOR activation and inhibition.

Main Results:

  • Phosphate activates the mTOR cascade in VSMCs, leading to decreased Klotho expression.
  • Rapamycin treatment effectively halted medial arterial calcification.
  • The inhibitory effect of rapamycin on calcification was diminished in the absence of Klotho.

Conclusions:

  • mTOR signaling plays a critical role in medial arterial calcification by downregulating Klotho.
  • Rapamycin demonstrates potential as a therapeutic agent for inhibiting both medial calcification and intimal atherosclerosis.

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