Neuronal spermine-sensitive survival pathways

Neuronal spermine-sensitive survival pathways refer to a complex network of signaling mechanisms in the central nervous system that are modulated by the endogenous polyamine spermine. These pathways primarily involve the allosteric modulation of N-methyl-D-aspartate (NMDA) receptors and the blockade of inwardly rectifying potassium (Kir) channels and sodium leak channels (NALCN). Spermine acts as a positive allosteric modulator of NMDA receptors containing the GluN2B (NR2B) subunit, which, at physiological concentrations, can promote pro-survival signaling through the activation of the Akt/mTOR and CREB pathways, essential for neurite outgrowth and neuronal maintenance. Dysregulation of these pathways is a significant factor in various neurological conditions. Excessive spermine levels or its catabolism by spermine oxidase (SMOX) can lead to the production of reactive oxygen species and neurotoxic byproducts, contributing to excitotoxicity and cell death in stroke and neurodegenerative diseases. Conversely, the spermine-sensitive subunit of the NMDA receptor is highly expressed during development, where it plays a critical role in neuronal plasticity. Therapeutic strategies targeting these pathways often utilize polyamine site antagonists or subunit-specific NMDA receptor blockers, such as ifenprodil, to mitigate excitotoxic damage while preserving essential survival signaling.

Other names

Spermine-mediated neuroprotectionPolyamine-sensitive neuronal signalingSpermine-modulated survival pathwaysPolyamine-sensitive NMDA receptor signaling

Allosteric modulation of N-methyl-D-aspartate (NMDA) receptors (specifically the GluN2B subunit) and blockade of inwardly rectifying potassium (Kir) channels and sodium leak channels (NALCN).