{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nPhosphodiesterase 2A (PDE2A) is a dual‐substrate enzyme that hydrolyzes both cAMP and cGMP, thereby controlling key intracellular signaling pathways. Structural studies have revealed that PDE2A possesses regulatory GAF domains that, upon binding cGMP, induce conformational changes allowing increased substrate access to the catalytic core. Such allosteric regulation is essential for fine-tuning cyclic nucleotide levels. In cardiovascular settings, PDE2A is upregulated in conditions such as dilated cardiomyopathy and heart failure, where its enhanced activity contributes to the blunting of β‑adrenergic signaling and altered platelet responses."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn vascular and metabolic contexts, PDE2A plays multifaceted roles. In endothelial cells, inflammatory mediators such as TNF‑α induce PDE2A expression, which in turn contributes to increased permeability and supports reactive oxygen species generation via NADPH oxidase activation. Such mechanisms underlie altered angiogenesis and cell proliferation in both in vitro endothelial models and in vivo settings. A specialized mitochondrial isoform of PDE2A targets the matrix, operating in a local signaling system that modulates respiratory chain activity and energy metabolism. Moreover, altered PDE2A expression has been associated with hepatocellular carcinoma aggressiveness and is evident in tissues with finely tuned vascular functions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its cardiovascular and vascular roles, PDE2A is implicated in neurological regulation, oncogenesis, and endocrine disorders. In the central nervous system and tumor microenvironments, PDE2A functions to constrain stemness properties—as observed in glioma stem cells—while genetic variants in PDE2A have been linked to movement disorders such as refractory childhood dyskinesia. Altered PDE2A signaling also influences cell cycle progression and invasion in malignant melanoma, and rare PDE2A mutations contribute to endocrine dysregulation in conditions like primary aldosteronism and pituitary adenoma development. The emergence of selective PDE2A (and dual PDE2A/PDE10A) inhibitors, together with comparative studies with parasitic phosphodiesterases, underscores the enzyme’s therapeutic potential across neuropsychiatric, metabolic, and lymphatic dysfunctions, as highlighted by its role in endothelial junction maturation and valve formation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "22"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Haodi Wu, Jaecheol Lee, Ludovic G Vincent, et al. 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