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Many roles for DSIP have been suggested following research carried out using peptide analogues with a greater molecular stability and through measuring DSIP-like immunological (DSIP-LI) response by injecting DSIP antiserum and antibodies

Roles in endocrine regulation
Decreases basal corticotropin level and blocks its release.
Stimulates release of luteinizing hormo (LH).
Stimulates release of somatoliberin and somatotrophin secretion and inhibits somatostatin secretion.

Structure and Interactions
DSIP is an amphiphilic peptide of molecular weight 850 daltons with the amino acid motif:N-Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu-C
It has been found in both free and bound forms in the hypothalamus, limbic system and pituitary as well as various peripheral organs, tissues and body fluids.[5] In the pituitary it co-localises with many peptide and non-peptide mediators such as corticotropin-like intermediate peptide (CLIP), adrenocorticotrophic hormone (ACTH), melanocyte-stimulating hormone (MSH), thyroid-stimulating hormone (TSH) and melanin concentrating hormone (MCH). It is abundant in the gut secretory cells and in the pancreas where it co-localises with glucagon.
In vitro it has been found to have a low molecular stability with a half life of only 15 minutes due to the action of a specific aminopeptidase-like enzyme.It has been suggested that in the body it complexes with carrier proteins to prevent degradation, or exists as a component of a large precursor molecule,but as yet no structure or gene has been found for this precursor.

Evidence supports the current belief that it is regulated by glucocorticoids.
Gimble et al. suggest that DSIP interacts with components of the MAPK cascade and is homologous to glucocorticoid-induced leucine zipper (GILZ).GILZ can be induced by Dexamethaso. It prevents Raf-1 activation, which inhibits phosphorylation and activation of ERK.

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