Vesicular glutamate transporter 2 (SLC17A6) (VGLUT2)

Vesicular glutamate transporter 2 (VGLUT2), encoded by the SLC17A6 gene, is a transmembrane protein responsible for loading glutamate into synaptic vesicles in excitatory neurons [1]. In the spinal cord, VGLUT2 is the primary marker for excitatory interneurons in the dorsal horn, which play a pivotal role in the processing and transmission of nociceptive (pain) signals from the periphery to the brain [2]. These VGLUT2+ excitatory nociceptive interneurons are essential for both acute pain perception and the development of chronic pain states, such as mechanical allodynia and neuropathic pain [3, 4]. Research indicates that selective ablation or silencing of these neurons significantly reduces pain hypersensitivity, making them a high-interest target for analgesic development [2]. While direct pharmacological inhibition of VGLUT2 remains challenging due to its widespread expression in the central nervous system, including the thalamus and hypothalamus, cell-specific targeting strategies are being explored to modulate pain pathways without systemic toxicity [5]. Understanding the heterogeneity of VGLUT2+ subpopulations, such as those expressing somatostatin or calretinin, is crucial for developing more precise therapeutic interventions for chronic pain conditions [2]. Experimental inhibitors like Chicago Sky Blue 6B have been used to study VGLUT2 function, but clinical applications are currently limited by lack of selectivity [5].

Other names

SLC17A6Solute carrier family 17 member 6DNPIDifferentiation-associated Na(+)-dependent inorganic phosphate cotransporterVGLUT2+ excitatory nociceptive interneurons

Competitive inhibition of the vesicular glutamate transporter, preventing the loading of glutamate into synaptic vesicles and subsequently reducing the amount of glutamate released during exocytosis [1, 5].