Innate immunity and angiogenesis.

Activation of an innate immune response is among the first lines of defense after tissue injury. Restoring blood flow to the site of injured tissue is often a necessary prerequisite for mounting an initial immune response to pathogens and for subsequent initiation of a successful repair of wounded tissue. The multiple links among pathogen recognition and suppression, increased angiogenesis, and tissue repair are the topics of this review, which examines of the roles of antimicrobial peptides, mammalian toll-like receptors (TLRs), inflammatory cytokines, and putative "danger" signals, among other signaling pathways, in triggering, sustaining, and then terminating an angiogenic response.