Islet sympathetic nerves: Islets are densely innervated by sympathetic nerves, as demonstrated by fluorescence microscopy, electron microscopy, and immunocytochemistry. The islet sympathetic nerves are postganglionic nerve fibers with most nerve cell bodies located in the celiac ganglion and some in the paravertebral sympathetic ganglia. Electrical activation of the sympathetic nerves inhibits insulin secretion and stimulates glucagon secretion.

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Will you use the combination of insulin and a GLP-1 (when it becomes available) sooner than you would recommend insulin alone for people with type 2 diabetes? Follow the link to share your opinion!

Vasoactive intestinal polypeptide (VIP): VIP was originally isolated from the porcine small intestine in the early 1970s and found to consist of 28 amino acid residues, with a C-terminal α-amidation showing structural similarities to other members of the glucagon superfamily of peptides [18]. VIP is formed by processing of 149-amino acid proVIP and is highly conserved as illustrated by human, porcine, and rat VIP increased glucose tolerance with a reduction of circulating glucose.

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