Klotho Ameliorates Vascular Calcification via Promoting Autophagy

Area of Science:

• Cardiovascular Biology
• Aging Research
• Cellular Mechanisms

Background:

• Vascular calcification (VC) is a hallmark of vascular aging.
• Klotho deficiency is linked to VC, but the underlying mechanisms are not fully understood.
• Autophagy's role in Klotho-mediated VC regulation requires elucidation.

Purpose of the Study:

• To investigate the role of autophagy in Klotho's protective effects against vascular calcification.
• To explore the mechanisms by which Klotho influences autophagy in the context of VC.

Main Methods:

• Clinical correlation analysis of serum Klotho levels and aortic calcification (Agatston score).
• In vivo studies using Klotho-deficient mice with and without Klotho protein supplementation.
• In vitro experiments using mouse vascular smooth muscle cells (MOVAS) under calcifying conditions.

Main Results:

• Serum Klotho levels negatively correlated with aortic calcification.
• Klotho deficiency exacerbated aortic VC in mice, which was reversed by Klotho supplementation.
• Autophagy was upregulated in Klotho-deficient aortas and conferred protection against VC.
• Klotho promoted autophagy in vivo and in vitro, thereby ameliorating vascular calcification.

Conclusions:

• Klotho deficiency increases autophagy as a protective response against VC.
• Klotho enhances autophagy to further ameliorate vascular calcification.
• These findings highlight the Klotho-autophagy axis as a potential therapeutic target for VC.