Ac-Pro-Gly-Pro-OH is an endogenous degradation product of extracellular collagen and acts as a CXCR2 agonist. Ac-Pro-Gly-Pro-OH exerts bactericidal activity by generating hydrogen peroxide, inhibits pulmonary inflammation, and reduces immune cell apoptosis (apoptosis). Ac-Pro-Gly-Pro-OH promotes the production of IFN-gamma and inhibits the production of TNF-alpha and IL-6 in leukocytes. Ac-Pro-Gly-Pro-OH increases the survival rate of mice in sepsis models, enhances the bactericidal activity of neutrophils, acts as a neutrophil chemoattractant, induces neutrophil polarization, and regulates inflammatory and repair processes. Ac-Pro-Gly-Pro-OH induces chronic inflammation and tissue remodeling through sustained action. Ac-Pro-Gly-Pro-OH is released via alkaline hydrolysis of corneal proteins in alkali-injured eyes, thereby driving the early infiltration of neutrophils into the cornea. Ac-Pro-Gly-Pro-OH is applicable to research related to sepsis, chronic obstructive pulmonary disease, cystic fibrosis, bronchiolitis obliterans syndrome, severe asthma, idiopathic pulmonary fibrosis, and corneal ulcer[1][2][3].
