C-Type Natriuretic Peptide Preserves Vascular and Cardiac Function in Sepsis

Area of Science:

• Cardiovascular Physiology
• Immunology
• Endocrinology

Background:

• Sepsis is a critical global health challenge with high mortality.
• The role of C-type natriuretic peptide (CNP) in sepsis pathogenesis remains incompletely understood.
• CNP is known to regulate inflammation and cardiovascular homeostasis.

Purpose of the Study:

• To investigate the endogenous role of CNP in sepsis.
• To evaluate the therapeutic potential of CNP in sepsis models.
• To elucidate the specific mechanisms and receptors involved in CNP's action during sepsis.

Main Methods:

• Measured plasma NT-proCNP levels in sepsis patients.
• Utilized various CNP knockout mouse models (endothelium-restricted, cardiomyocyte-restricted) and NPR-C knockout mice.
• Administered CNP therapeutically in experimental sepsis models to assess its effects on cardiac function, hemodynamics, and inflammation.

Main Results:

• Elevated NT-proCNP in sepsis patients correlated with reduced disease severity.
• CNP deficiency exacerbated sepsis phenotypes, including impaired microcirculation and increased inflammation.
• NPR-C knockout mice exhibited worsened sepsis outcomes, indicating its crucial role.
• CNP treatment improved cardiovascular and inflammatory parameters in wild-type and ecCNP knockout mice.

Conclusions:

• Endogenous CNP confers protection during sepsis by maintaining microvascular perfusion, cardiac function, and endothelial integrity via NPR-C.
• Pharmacological targeting of CNP signaling presents a promising therapeutic avenue for sepsis management.