Neurotrophin pathway receptor

The **neurotrophin pathway receptors** encompass a family of membrane-bound proteins that mediate the cellular actions of neurotrophins—secreted polypeptide growth factors critical for the development, maintenance, and plasticity of the nervous system[1][2][4][5][6]. The main families include the **tropomyosin receptor kinase (Trk) receptors** (TrkA/NTRK1, TrkB/NTRK2, TrkC/NTRK3), which are receptor tyrosine kinases, and the **p75 neurotrophin receptor** (p75NTR, NGFR), which is a member of the tumor necrosis factor (TNF) receptor superfamily[1][4][5]. Trk receptors preferentially bind mature neurotrophins with high affinity and transduce signals promoting neuronal survival, differentiation, and synaptic function, whereas p75NTR binds all neurotrophins and has context-dependent effects, including promoting apoptosis or enhancing Trk signaling[1][2][5][6]. These receptors are significant therapeutic targets, implicated in neurodegenerative diseases, cancers with NTRK gene fusions, nerve injury, and potentially psychiatric disease[1][2][3][4][5]. Drugs targeting Trk receptors are approved for cancers with NTRK fusions, while other strategies modulate their activity for neuroprotection or regeneration[8][9]. Because the term "Neurotrophin pathway receptors" aggregates several distinct receptors that differ in structure and biology, it is not the canonical name for a singular molecule; instead, **TrkA receptor, TrkB receptor, TrkC receptor, and p75 neurotrophin receptor** should be treated separately for structured annotation[1][2][4][5].

Other names

Trk receptor familyTrkA receptor (NTRK1)TrkB receptor (NTRK2)TrkC receptor (NTRK3)p75 neurotrophin receptor (p75NTR, NGFR)tropomyosin receptor kinase receptorlow-affinity neurotrophin receptor

Agonists (e.g., neurotrophins, DHEA) activate receptor signaling and promote survival or, in some contexts, apoptosis (especially for p75NTR); Antagonists or inhibitors (such as NTRK inhibitors) block downstream signal transduction, suppressing tumor growth or aberrant neuronal signaling