{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPCSK9 is a secreted serine protease that plays a central role in cholesterol homeostasis by post‐transcriptionally regulating the levels of the hepatic low‐density lipoprotein receptor (LDLR). By binding specifically to the extracellular epidermal growth factor–like A (EGF-A) domain of LDLR, PCSK9 prevents receptor recycling and triggers lysosomal degradation of LDLR. Genetic studies have shown that missense mutations in the PCSK9 gene can manifest as autosomal dominant hypercholesterolemia when they increase PCSK9’s ability to degrade LDLR, whereas loss‐of‐function mutations lower plasma LDL cholesterol and confer protection from coronary heart disease. These findings, drawn from diverse patient cohorts and mutation‐screening studies, underscore PCSK9’s pivotal contribution to cholesterol regulation and cardiovascular risk."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "14"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its core function in LDLR regulation, PCSK9 influences a broader network of lipid metabolism and cellular processes. Detailed mechanistic studies have revealed that PCSK9 binding is pH-dependent—with tighter interactions in the acidic environment of endosomes—and that this binding not only affects LDLR but also extends to related receptors (such as very low–density lipoprotein receptor and ApoE receptor 2), thereby modulating the clearance of other atherogenic particles like lipoprotein(a). Furthermore, alterations in receptor trafficking mediated by PCSK9 have been implicated in inflammatory responses and tumor cell immune evasion. Pharmacologic inhibition using monoclonal antibodies has been shown to elevate LDLR levels, further enhancing the clearance of LDL cholesterol and related lipoproteins, which supports the rationale for targeting PCSK9 in dyslipidemia."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "15", "end_ref": "26"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nEmerging therapeutic strategies have further expanded the clinical relevance of PCSK9. Novel approaches—including genome editing techniques such as CRISPR-mediated base editing and long-acting monoclonal antibody therapies—aim to achieve sustained PCSK9 suppression, ultimately enhancing LDLR-mediated clearance of cholesterol and lowering cardiovascular risk. Moreover, recent data indicate that PCSK9 inhibition may beneficially modulate inflammatory pathways and improve responses to immune checkpoint therapy in oncology, highlighting its multifaceted role beyond lipid regulation. These innovative modalities exemplify the translational impact of PCSK9 research in cardiovascular medicine and beyond."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "27", "end_ref": "31"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Marianne Abifadel, Mathilde Varret, Jean-Pierre Rabès, et al. 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