Neuroendocrine secretory granule (NSG) (NSG)

Neuroendocrine secretory granules, also known as large dense-core vesicles (LDCVs), are specialized organelles found in neuroendocrine cells and neurons that serve as the primary storage and release sites for bioactive molecules (GO:0030141). These granules house a variety of cargo, including peptide hormones such as insulin, neuropeptides, and biogenic amines like catecholamines (PMID: 29056331). They are characterized by a dense core containing granin proteins, most notably Chromogranin A, which is essential for cargo packaging and serves as a major clinical biomarker for neuroendocrine tumors (PMID: 15617488). The granules are formed at the trans-Golgi network and undergo a maturation process involving acidification and the proteolytic processing of prohormones into their active forms. Regulated exocytosis of these granules is triggered by stimuli such as calcium influx, allowing for the precise secretion of hormones into the bloodstream or neurotransmitters into the synaptic cleft. While the granule itself is a complex organelle rather than a single molecular target, specific proteins associated with its membrane, such as the vesicular monoamine transporter 2 (VMAT2), are key therapeutic targets (DrugBank: DB00487). Drugs like tetrabenazine and reserpine interact with these granules by inhibiting VMAT2, thereby depleting the granule's monoamine stores to treat movement disorders. Dysfunction in granule biogenesis or secretion is linked to various diseases, including diabetes mellitus, pheochromocytoma, and various neuroendocrine cancers (StatPearls: NBK537031).

Other names

Large dense-core vesicleLDCVDense-core granuleSecretory vesicleChromaffin granule

Inhibition of vesicular monoamine transporters (VMAT) to prevent the storage and subsequent release of neurotransmitters from the granule.