ASICs and cardiovascular homeostasis

Area of Science:

• Neuroscience
• Cardiovascular Physiology
• Molecular Biology

Background:

• Acid-Sensing Ion Channels (ASICs) are involved in sensory signal transduction.
• Dysfunction of ASICs in afferent nerves contributes to cardiovascular disease pathology.
• ASICs modulate sympathetic and parasympathetic activity, impacting cardiovascular homeostasis.

Purpose of the Study:

• To review the role of ASICs in sensory pathways regulating cardiovascular function.
• To explore the contribution of ASIC2 and ASIC3 to baroreceptor and chemoreceptor sensitivity.
• To discuss the implications of ASIC dysfunction in cardiovascular diseases and potential therapeutic strategies.

Main Methods:

• Review of existing literature on ASICs in sensory neurons.
• Analysis of ASIC expression and function in models of hypertension and heart failure.
• Investigation of ASIC involvement in exercise pressor reflex and cardiac nociception.

Main Results:

• ASIC2 is critical for baroreceptor mechanosensitivity, while ASIC3 mediates chemoreceptor pH sensitivity.
• Reciprocal changes in ASIC2 and ASIC3 expression exacerbate sympathetic nerve activity in hypertension and heart failure.
• ASIC heteromers contribute to exercise pressor reflex and cardiac ischemia-induced sympathetic activation.
• ASIC2 activation can suppress sympatho-excitatory reflexes.

Conclusions:

• ASIC dysfunction leads to sensory dysautonomia and sympatho-vagal imbalance in cardiovascular diseases.
• Targeting ASICs, particularly ASIC2, offers potential for therapeutic intervention in cardiovascular disorders.
• Understanding ASIC roles provides insights into neural control of the cardiovascular system.