The myogenic response: established facts and attractive hypotheses

Area of Science:

• Vascular physiology
• Cardiovascular research

Background:

• The myogenic response regulates blood flow in small arteries and arterioles.
• It involves vessel constriction with increased pressure and dilation with decreased pressure.

Purpose of the Study:

• To review evidence on myogenic response mechanisms, differentiating established facts from hypotheses.
• To clarify the current understanding and ongoing debates in the field.

Main Methods:

• Literature review of experimental evidence on the myogenic response.
• Analysis of studies investigating cellular and molecular mechanisms.

Main Results:

• Established: Myogenic response is triggered by wall tension, independent of endothelium.
• Established: Pressure increases cause depolarization and Ca2+ influx via voltage-operated channels.
• Hypothetical: Mechanisms of depolarization, Ca2+ influx pathways, intracellular Ca2+ release, and second messenger involvement are debated.

Conclusions:

• Primary mechanisms of the myogenic response are well-understood.
• Detailed signaling pathways remain undefined and require further research.
• Clinical significance of the myogenic response is yet to be determined.