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PAR2: The Cornerstone of Pancreatic Diseases
1Department of Pathology and Molecular Medicine, Third Medical Faculty, Charles University and Thomayer University Hospital, Prague, Czech Republic. petr.suhaj@ftn.
Abstract:
It has been 30 years since the first member of the protease-activated receptor (PAR) family was discovered. This was followed by the discovery of three other receptors, including PAR2. PAR2 is a G protein-coupled receptor activated by trypsin site-specific proteolysis. The process starts with serine proteases acting between arginine and serine, creating an N-terminus that functions as a tethered ligand that binds, after a conformational change, to the second extracellular loop of the receptor, leading to activation of G-proteins. The physiological and pathological functions of this ubiquitous receptor are still elusive. This review focuses on PAR2 activation and its distribution under physiological and pathological conditions, with a particular focus on the pancreas, a significant producer of trypsin, which is the prototype activator of the receptor. The role in acute or chronic pancreatitis, pancreatic cancer, and diabetes mellitus will be highlighted.
Insights
Protease-activated receptor 2 (PAR2) activation is key to understanding pancreatic diseases. This review explores PAR2
Area of Science:
- G protein-coupled receptor (GPCR) signaling pathways.
- Molecular mechanisms of protease-activated receptors (PARs).
Background:
- The protease-activated receptor (PAR) family, including PAR2, plays a role in various physiological and pathological processes.
- PAR2 is a G protein-coupled receptor activated by specific serine proteases, such as trypsin.
- The precise functions of PAR2 in health and disease remain incompletely understood.
Approach:
- This review synthesizes current knowledge on PAR2 activation mechanisms.
- It examines the distribution of PAR2 in various tissues and conditions.
- A specific focus is placed on the pancreas, a major site of trypsin production.
Key Points:
- PAR2 activation involves trypsin-mediated cleavage, generating a tethered ligand that induces receptor conformational changes and G-protein signaling.
- The review highlights PAR2's distribution in physiological and pathological contexts.
- Special attention is given to the pancreas, emphasizing PAR2's involvement in pancreatitis, pancreatic cancer, and diabetes mellitus.
Conclusions:
- Understanding PAR2 activation and distribution is crucial for elucidating its multifaceted roles.
- Further research into PAR2's involvement in pancreatic pathologies may reveal novel therapeutic targets.
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