Antimicrobial Peptides Do More Than Fight Infection — They Also Regulate Blood Clotting and Vessel Repair

This is a critical narrative review synthesizing current literature on host defense peptides' roles in hemostasis, platelet biology, endothelial cell interactions, and tissue repair. The authors integrated molecular mechanism studies, functional assays, and emerging concepts to propose new frameworks for understanding peptide-mediated vascular regulation.

The connection between infection and blood clotting complications (thromboinflammation) has been dramatically highlighted by conditions like COVID-19. Understanding that antimicrobial peptides serve as molecular switches between repair and pathological clotting could explain why infections sometimes trigger dangerous cardiovascular events — and open new therapeutic avenues.

This review represents a convergence of immunology, hematology, and vascular biology. By recognizing antimicrobial peptides as multi-functional regulators rather than simple germ-killers, the field is moving toward a more integrated understanding of how innate immunity, blood clotting, and tissue repair are coordinated — with implications for designing safer anti-infective and anti-thrombotic therapies.

As a review article, this study synthesizes but does not generate new experimental data. Many of the proposed frameworks (concentration-dependent switching, adaptive thrombopoiesis) are hypotheses that require further experimental validation. The therapeutic potential of peptidomimetics discussed remains largely theoretical at this stage.