Niacin-induced flushing: Mechanism, pathophysiology, and future perspectives

Area of Science:

• Physiology
• Pharmacology
• Dermatology

Background:

• Flushing is a physiological response involving vasodilation, warmth, and redness, often linked to emotions or medical conditions.
• Niacin-induced flushing is a common side effect of niacin therapy, used for cholesterol management.

Purpose of the Study:

• To elucidate the complex physiological mechanisms of flushing, particularly niacin-induced flushing.
• To review the cardiovascular benefits of niacin and explore strategies to mitigate flushing side effects.

Main Methods:

• Review of existing literature on flushing physiology and niacin's mechanisms of action.
• Analysis of niacin's interaction with hydroxycarboxylic acid receptor 2 (HCA2/GPR109A) and TRPV1 channels.
• Examination of niacin's cardiovascular effects and novel drug delivery systems.

Main Results:

• Niacin-induced flushing involves activation of HCA2, leading to prostaglandin release (PGD2), and direct interaction with TRPV1 channels.
• Niacin improves lipid profiles and reduces cardiovascular events, especially when combined with statins.
• Innovative formulations and nanomedicine show promise for reducing niacin-induced flushing and improving patient compliance.

Conclusions:

• Flushing is a multifaceted physiological event with various causes, including niacin therapy.
• Understanding niacin's dual mechanism (HCA2 and TRPV1) is key to managing its side effects.
• Further research into novel delivery systems is crucial for optimizing niacin's therapeutic potential and patient experience.