The Origin, Expression, Function and Future Research Focus of a G Protein-coupled Receptor, Mas-related Gene X2 (MrgX2).
Wu. Haihui H; Zeng. Meiqi M; Cho. Eric Y P EY; Jiang. Wenqi W; Sha. Ou O
Key Findings
- MrgX2 is a G‑protein‑coupled receptor located in sensory neurons and mast cells.
- LL‑37 is one of several peptides that can bind to and activate MrgX2.
- Activation of MrgX2 can trigger nociception (pain signaling) and mast cell degranulation, linking it to both pain and antimicrobial defenses.
Practical Outcomes
- Because LL‑37 can activate MrgX2 and cause mast cell release, using LL‑37 supplements may provoke inflammation or pain in some people. Biohackers should be cautious with dosing and consider delivery methods that limit direct exposure to mast cells. Targeting MrgX2 could become a strategy for modulating pain or immune responses, but more research is needed before practical protocols can be recommended.
Summary
MrgX2 is a receptor found on certain nerve cells and mast cells that can be turned on by the peptide LL-37 (among other molecules). When activated, it can cause pain signals and release of mast cell chemicals, which are part of the body's immune response. The paper mainly reviews what is known about this receptor and suggests areas for future study.
Abstract
Mas-related genes (Mrgs) belong to a large family of G protein-coupled receptor genes found in rodents. Human MRGX proteins are G protein-coupled 7-transmembrane proteins sharing 41-52% amino acid identity with each other, but have no orthologs in rodents. MrgX2 is a member of the MrgX family. MRGX2 is expressed in the small neurons of sensory ganglia and mast cells. It can interact with a series of factors and genes such as the peptides substance P, vasoactive intestinal peptide, cortistatin (CST), proadrenomedullin N-terminal peptide (PAMP), LL-37, PMX-53 and β-defensins. MRGX2 is related to nociception, adrenal gland secretion and mast cell degranulation. Recent research on MrgX2 provides insights into its role in nociception and anti-microbial activities. This article reviewed the origin, expression and function of MrgX2, and discussed possible future research focus.
Study Information
pubmed
2015
2015-06-08T00:00:00.000Z
10.1016/j.proghi.2015.06.001
21
39