PR 39 is a 39 amino acid proline-rich cathelicidin host defence and immunomodulatory peptide isolated from porcine polymorphonuclear neutrophils. PR 39 plays a pivotal role in the innate immune defence of the pig against infections. Besides direct antimicrobial activity, PR 39 is involved in wound healing and also stimulates angiogenesis and inhibits inflammatory responses by selectively blocking proteasome degradation of I kappa Balpha.
