{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRecent advances have underscored the critical roles of meprin metalloproteases—a family of zinc‐dependent enzymes—in orchestrating proteolytic processes fundamental to extracellular matrix dynamics and bioactive peptide regulation. Detailed biochemical studies have characterized their catalytic mechanisms, including the coordination of zinc at the active site, the impact of conserved residues on enzymatic activity, and the importance of glycosylation in promoting oligomer formation and proteolytic stability. These foundational insights into meprin structure and function have established the framework for understanding their diverse biological actions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn several tissues, meprins are instrumental in processing key structural and regulatory proteins. For example, the proteolytic cleavage of procollagen I into mature collagen fibrils preserves connective tissue strength and integrity, while the N‐terminal truncation of natriuretic peptides is critical for their subsequent inactivation and clearance—a process with significant implications for blood pressure control and cardiac homeostasis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nMeprin activity has also been linked to the maintenance of intestinal homeostasis. Genetic studies and experimental mouse models have demonstrated that reduced expression of meprin alpha, as seen in patients with inflammatory bowel disease (IBD), is associated with aggravated inflammation and tissue injury within the gut. These observations suggest that a tightly regulated level of meprin activity is protective against mucosal damage and may prevent the chronic inflammatory processes underlying IBD."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn the kidney, meprins contribute to both injury and repair responses. Their aberrant activity has been implicated in the pathogenesis of acute renal failure—whether following endotoxemia, ischemia–reperfusion injury, or toxic insults such as cisplatin treatment. By modulating signaling pathways including protein kinase A and influencing complement activation, meprins affect not only extracellular matrix remodeling but also serve as potential biomarkers for renal injury progression."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "12"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nCardiac remodeling and vascular disease are additional pathological settings in which meprins exert significant influence. Experimental evidence indicates that both genetic deletion and pharmacological inhibition of meprin A can alleviate cardiac hypertrophy, fibrosis, and inflammatory cytokine production by modulating downstream signalling pathways (such as ERK1/2). Furthermore, genetic association studies have implicated meprin activity in atherosclerosis development through effects on oxidative stress and inflammatory cell recruitment. Within this intricate regulatory milieu, in silico analyses suggest that microRNAs—including MIR4329—may function as post‐transcriptional regulators of meprin expression. Although these abstracts do not report direct experimental data on MIR4329, its predicted targeting of meprin transcripts implies that it could fine‐tune protease activity, thereby influencing collagen processing, inflammatory homeostasis, and tissue remodeling across the kidney, intestine, and heart."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "17"}]}, {"type": "t", "text": ""}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Bruce A Doll, James P Villa, Faoud T Ishmael, et al. 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