TAAR Immunopharmacology

Area of Science:

• Immunology
• Neuroscience
• Pharmacology

Background:

• Trace amine-associated receptors (TAARs) are G protein-coupled receptors primarily known for their role in the central nervous system.
• Emerging evidence shows TAARs, especially TAAR1 and TAAR2, are expressed in various immune cells, including leukocytes, lymphocytes, and macrophages.

Purpose of the Study:

• To review the current understanding of TAAR expression, function, and potential therapeutic relevance within the immune system.
• To explore the role of TAAR signaling in immune cell function and inflammatory responses.
• To discuss the involvement of TAARs in the pathophysiology of various immune-related diseases.

Main Methods:

• Review of existing literature on TAAR expression in immune cells.
• Analysis of functional studies on TAAR signaling in immune responses.
• Discussion of TAARs' role in disease pathogenesis.

Main Results:

• TAAR1 and TAAR2 are predominantly expressed across innate and adaptive immune cells.
• TAAR signaling modulates immune responses like chemotaxis and cytokine production, but effects are context-dependent.
• TAARs are implicated in diseases such as inflammatory bowel disease, multiple sclerosis, and Parkinson's disease.

Conclusions:

• TAAR immunopharmacology is a growing field with preclinical evidence suggesting involvement in immune-mediated disorders.
• Significant limitations exist, including methodological heterogeneity and incomplete validation, hindering translation.
• Further integrated research is crucial to clarify TAAR's pathophysiological significance and therapeutic potential in immune disorders.