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A Reproducible Intensive Care Unit-Oriented Endotoxin Model in Rats
Published on: February 20, 2021
PAC1 receptor: emerging target for septic shock therapy
Carmen Martínez1, Alicia Arranz, Yasmina Juarranz
1Department of Cell Biology, Faculty of Medicine, Complutense University, Ciudad Universitaria, 28040 Madrid, Spain. cmmora@bio.ucm.es
Vasoactive intestinal polypeptide (VIP) and pituitary adenylate cyclase-activating polypeptide (PACAP) protect against septic shock by reducing inflammation and tissue damage. Targeting the PAC1 receptor offers a promising strategy for novel septic shock therapies.
Area of Science:
- Immunology
- Pharmacology
- Critical Care Medicine
Background:
- Septic shock is a life-threatening response to infection, characterized by hypotension and multi-organ failure.
- Pro-inflammatory mediators, adhesion molecules, and coagulation factors drive septic shock pathology.
- Vasoactive intestinal polypeptide (VIP) and pituitary adenylate cyclase-activating polypeptide (PACAP) possess anti-inflammatory properties via specific receptors.
Purpose of the Study:
- To investigate the protective role of the PAC1 receptor in an experimental model of lethal endotoxemia.
- To determine if VIP and PACAP exert anti-inflammatory effects through the PAC1 receptor in septic shock.
Main Methods:
- Utilized a knockout mouse model lacking the PAC1 receptor to study endotoxemia.
- Administered VIP and PACAP to assess their impact on inflammatory markers.
- Measured lipopolysaccharide (LPS)-induced interleukin-6 (IL-6) production and inflammatory cell infiltration.
Main Results:
- VIP and PACAP significantly reduced LPS-induced IL-6 production in a PAC1 receptor-dependent manner.
- These immunopeptides decreased neutrophil infiltration and expression of adhesion molecules (ICAM-1, VCAM-1) and fibrinogen.
- Mice lacking the PAC1 receptor showed a diminished protective response to VIP and PACAP.
Conclusions:
- The PAC1 receptor mediates the protective anti-inflammatory effects of VIP and PACAP in experimental septic shock.
- Targeting the PAC1 receptor with VIP or PACAP analogs could be a valuable therapeutic strategy for septic shock.
- This approach may complement existing intensive care treatments for septic shock.
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