{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRecent research into synaptic scaffolding proteins has revealed critical roles in modulating neuronal signaling and plasticity, with important implications for conditions such as traumatic brain injury (TBI). In one study, the postsynaptic scaffold protein Preso was found to regulate N‐methyl-D-aspartate receptor (NMDAR) activity and downstream nitric oxide (NO) and Ca2+ responses. Downregulation of Preso resulted in neuroprotection in TBI models, largely by dampening excitotoxic signaling mediated via its interactions with PSD-95 and downstream effectors such as neuronal nitric oxide synthase (nNOS) and cyclin-dependent kinase 5 (CDK5)."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn a related investigation into neural scaffolding proteins and cognitive development, FRMPD4 was shown to participate in dendritic spine morphogenesis through its binding with PSD-95 and Homer. Disruptive mutations in FRMPD4 were linked to an X-linked intellectual disability syndrome in humans and produced spatial learning and memory deficits in mouse models, highlighting the importance of properly organized postsynaptic structures for normal synaptic function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAlthough neither study explicitly addresses MIR4517, the context provided by these investigations suggests that microRNAs—such as MIR4517—might play an important regulatory role in fine-tuning the expression and activity of key postsynaptic scaffold proteins including Preso and FRMPD4. Such microRNA-mediated regulation could, in turn, influence NMDAR signaling pathways, calcium and NO responses, and dendritic spine dynamics, potentially impacting both neuroprotection following injury and cognitive function. This hypothesis underscores the need for further research to delineate whether MIR4517 directly or indirectly modulates these synaptic components and processes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Peng Luo, Xin Li, Xiuquan Wu, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Preso regulates NMDA receptor-mediated excitotoxicity via modulating nitric oxide and calcium responses after traumatic brain injury."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cell Death Dis (2019)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/s41419-019-1731-x"}], "href": "https://doi.org/10.1038/s41419-019-1731-x"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "31235685"}], "href": "https://pubmed.ncbi.nlm.nih.gov/31235685"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Juliette Piard, Jia-Hua Hu, Philippe M Campeau, et al. "}, {"type": "b", "children": [{"type": "t", "text": "FRMPD4 mutations cause X-linked intellectual disability and disrupt dendritic spine morphogenesis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Hum Mol Genet (2018)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1093/hmg/ddx426"}], "href": "https://doi.org/10.1093/hmg/ddx426"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "29267967"}], "href": "https://pubmed.ncbi.nlm.nih.gov/29267967"}]}]}]}