Vasculature on the clock: Circadian rhythm and vascular dysfunction

Area of Science:

• Physiology
• Chronobiology
• Vascular Biology

Background:

• The master mammalian circadian clock, located in the suprachiasmatic nucleus, synchronizes daily physiological and behavioral rhythms.
• Circadian cycles are endogenously generated and not solely dependent on external cues like light and food.
• Clock machinery is present in various cell types, including those within the vascular system.

Purpose of the Study:

• To highlight the role of endogenous circadian clocks in vascular function.
• To explore the contribution of circadian clock machinery in vascular cells to overall vascular health.
• To investigate the potential of targeting circadian rhythms for vascular disease therapies.

Main Methods:

• Review of existing literature on circadian biology and vascular physiology.
• Analysis of the presence and function of circadian clock components in vascular cells.
• Examination of the link between circadian rhythm disruption and vascular dysfunction pathophysiology.

Main Results:

• Circadian clock machinery is widely distributed, including in endothelial cells, fibroblasts, smooth muscle cells, and stem cells.
• This machinery plays a physiological role in modulating daily vascular function.
• Disturbances in circadian rhythms are implicated in the pathophysiology of vascular dysfunction.

Conclusions:

• Endogenous circadian clocks are crucial for maintaining vascular health.
• Dysfunction of the vascular circadian clock contributes significantly to vascular disease.
• Therapeutic strategies aimed at modulating circadian rhythms show promise for treating vascular diseases.