{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nBDNF/TrkB signaling is fundamentally required for neuronal survival, differentiation, and the strengthening of synaptic connections. Genetic models and biochemical analyses have demonstrated that activation of TrkB by its ligand BDNF initiates several intracellular cascades—including PLCγ, ERK, and CaMKII pathways—that support long‐term potentiation, neurogenesis, and proper cortical organization. Forebrain‐specific disruption of this signaling in mice results in deficits reminiscent of depressive phenotypes, underscoring its importance in cognitive and affective regulation."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nDistinct patterns of TrkB activation also modulate neuronal excitability and behavioral responses associated with reward and stress. For example, selective deletion or optogenetic control of TrkB‐expressing neurons in reward circuitry alters sensitivity to cocaine and social defeat stress, highlighting its role in tuning motivational drive."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAberrant TrkB signaling has been implicated in epileptogenesis and seizure propagation. Experimental models using conditional deletions show that impairing TrkB activation can hinder the progression of hippocampal seizures, suggesting that well‐regulated TrkB activity is critical for maintaining normal network excitability."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "16"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its neuroprotective roles, TrkB activation contributes to oncogenic processes. In epithelial cells, for instance, TrkB signaling suppresses caspase‐dependent anoikis, thereby enhancing cell survival and facilitating metastatic spread through mechanisms such as epithelial–mesenchymal transition. This pathway appears to be exploited in cancers including head and neck squamous cell carcinoma."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn glial populations, TrkB signaling is equally critical. In oligodendrocytes, TrkB promotes proper myelin sheath formation and thickness, whereas in astrocytes, upregulation of a truncated TrkB isoform during injury or inflammatory conditions can trigger nitric oxide release and contribute to neurodegeneration. Such findings illustrate the multifaceted roles of TrkB in supporting synaptic integrity and glial-mediated modulation of neural networks."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "20", "end_ref": "22"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nTrkB signaling is also crucial outside the central nervous system. It supports vascular stability in the heart and regulates innervation patterns in the cochlea, contributing to proper auditory function. In the ovary, TrkB activity in both oocytes and granulosa cells is required for the early growth of follicles. Furthermore, balanced TrkB signaling is essential for neuromuscular junction stability and motor neuron survival."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "23", "end_ref": "28"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nEfficient intracellular trafficking and regulated endocytosis of TrkB receptors are fundamental for proper signal transduction. Neuronal activity promotes rapid ligand‐induced receptor internalization in a Ca²⁺‐dependent manner, while factors such as membrane cholesterol levels can further modulate receptor availability and downstream signaling efficacy. Such mechanisms ensure that TrkB signaling is spatially and temporally coordinated in response to synaptic stimulation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}, {"type": "fg_fs", "start_ref": "29", "end_ref": "31"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nTrkB also plays a role in fine-tuning inhibitory synaptic transmission. Activation of its signaling cascade influences the transcription of key enzymes such as GAD65 in cortical interneurons, thereby modulating the balance between excitation and inhibition—a process whose dysregulation is implicated in neurodevelopmental and psychiatric disorders. Disruptions in TrkB-mediated control of inhibitory synapse function have been linked to abnormal GABAergic marker expression and interneuron dysfunction."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "32"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nA number of studies extend the impact of TrkB regulation to autonomic, sensory, and neurodegenerative contexts. Abnormalities in receptor internalization have been associated with heightened pain sensitivity following nerve injury, while impaired TrkB signaling contributes to disturbances in respiratory rhythmogenesis and mild cognitive deficits observed in early Parkinson’s disease. Moreover, aberrant expression of TrkB isoforms in models of neurodegeneration—such as in Alzheimer’s disease and in genetic conditions predisposing cells to apoptosis—underscore the need for balanced TrkB regulation for neural homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "34", "end_ref": "40"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nDespite the extensive characterization of TrkB function across diverse biological systems, none of the compiled studies directly address the role of MIR4454. Emerging research into microRNA regulation suggests that microRNAs can modulate BDNF/TrkB signaling by affecting mRNA stability and translation, thereby fine-tuning receptor expression and downstream responses. However, the specific contribution of MIR4454 to these processes remains unresolved, representing a promising avenue for future investigation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "41"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Beatriz Rico, Baoji Xu, Louis F Reichardt "}, {"type": "b", "children": [{"type": "t", "text": "TrkB receptor signaling is required for establishment of GABAergic synapses in the cerebellum."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Nat Neurosci (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1038/nn808"}], "href": "https://doi.org/10.1038/nn808"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "11836532"}], "href": "https://pubmed.ncbi.nlm.nih.gov/11836532"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Annakaisa Haapasalo, Ilkka Sipola, Kim Larsson, et al. 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