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Secretagogin is expressed in a variety of organs and tissues. It is expressed in pancreatic β cells, where it participates in insulin release.[7] In the brain, it is expressed in interneurons and pyramidal cells of the hippocampus.[8] In the brainstem, it is expressed neurons of the superior colliculus, cuneiform nucleus, locus coeruleus, and solitary tract nucleus.[9] In the spinal cord, secretagogin is expressed in the dorsal horn and dorsal root ganglia (up to 7% of DRGs) where it is co-expressed with calcitonin gene-related peptide (CGRP).[10] Secretagogin is also expressed in the sciatic nerve.[10] In gut tissue, secretagogin is expressed in 10% of enteric neurons of the small intestine, while it is expressed in 5% of enteric neurons of the proximal colon, and 25% in the distal colon.[11] Single-cell RNA sequencing of human and mouse intestinal tissue suggests that secretagogin is also expressed in about 15% of enteroendocrine cells.[12]
There are notable differences in secretagogin expression between mice and humans, particularly in the brain. For example, secretagogin is most highly expressed in the cerebellum of humans, while in mice the olfactory bulb has the most secretagogin-expressing neurons.[8]
Within pancreatic β cells, secretagogin assists in insulin release, particularly in scaling insulin release to glucose levels.[7] It does this by interacting with the actin cytoskeleton and synaptic release machinery such as SNAP-25. Deletion of secretagogin disrupts the membrane-specific localization of SNAP-25, suggesting that secretagogin is critical for the assembly of synaptic release machinery.[13]
In human fetal brain development, secretagogin is expressed in neocortical GABAergic neurons that migrate from the central and lateral ganglionic eminences. Secretagogin expression in these populations is highest right before birth, and wanes into adulthood. When secretagogin was overexpressed in embryonic neurons, their total neurite length and the number of branches increased, suggesting that secretagogin may play a role in neuronal arborization.[14]
