MMP-8

MMP-8 (matrix metalloproteinase-8), also known as neutrophil collagenase or collagenase-2, is a Zn²⁺-dependent extracellular matrix protease that primarily cleaves interstitial collagens and contributes to tissue remodeling and inflammatory responses^[1][2]. Mechanistically, MMP-8 regulates extracellular matrix turnover through degradation of collagen substrates and can influence inflammatory cell trafficking by generating bioactive collagen-derived peptides that promote neutrophil migration within collagen-rich tissues^[3][4]. Beyond structural matrix degradation, MMP-8 has been implicated in acute and chronic inflammatory processes, where excessive proteolytic activity contributes to tissue injury and disease progression^[2][5]. In disease settings, elevated MMP-8 activity is strongly associated with periodontal and peri-implant tissue destruction, and active MMP-8 serves as a marker of ongoing collagen degradation in inflammatory lesions^[5][6]. Experimental and clinical studies have also linked MMP-8 to sepsis, aortic aneurysm development, and cancer-related processes, highlighting its context-dependent roles in pathological tissue remodeling and host responses^[7][8][9]. Compared with related collagenases such as MMP-1 and MMP-13, MMP-8 is distinguished by its predominant storage in neutrophil granules and its specialized contribution to neutrophil-driven inflammatory responses, although all three enzymes share collagenolytic activity^[2][10]. For experimental applications, selective MMP-8 inhibitors have been developed and extensively characterized, providing useful tools for investigating collagenase-dependent mechanisms and evaluating therapeutic modulation of inflammatory tissue destruction^[11][12].