Cyclic Adenosine Monophosphate in Cardiac and Sympathoadrenal GLP-1 Receptor Signaling: Focus on Anti-Inflammatory...

Area of Science:

• Endocrinology
• Neuroscience
• Immunology

Background:

• Glucagon-like peptide-1 (GLP-1) is an incretin hormone with diverse physiological roles.
• Emerging evidence highlights GLP-1 receptor (GLP-1R) involvement in neuroprotection and inflammation suppression.
• GLP-1R is a G protein-coupled receptor activating cyclic 3',5'-adenosine monophosphate (cAMP) pathways.

Purpose of the Study:

• To review cAMP-dependent molecular signaling pathways activated by GLP-1R.
• To focus on pathways mediating anti-inflammatory effects of GLP-1R.
• To explore therapeutic potential for GLP-1R-mediated anti-inflammatory actions.

Main Methods:

• Literature review of studies on GLP-1R signaling.
• Analysis of cAMP-mediated downstream effects via protein kinase A (PKA) and exchange protein directly activated by cAMP (Epac).
• Examination of GLP-1R signaling in various cell types including cardiomyocytes, neurons, and adrenal chromaffin cells.

Main Results:

• GLP-1R activation of cAMP pathways elicits context-dependent pro- and anti-inflammatory effects.
• Specific cAMP-dependent pathways in cardiomyocytes, cardiac fibroblasts, central neurons, and adrenal chromaffin cells are discussed.
• The review highlights pathways leading to GLP-1R-mediated anti-inflammatory outcomes.

Conclusions:

• Elucidating cAMP's role in GLP-1R anti-inflammatory properties is crucial.
• This understanding can identify novel drug targets for inflammation.
• It may also support combination therapies with existing GLP-1R agonists.