Peptide hormone and paracrine signal
Somatostatin
Somatostatin is a peptide signal investigated in neuroendocrine communication and within pancreatic islets. In research models, its production site helps distinguish distant actions from regulation between neighboring cells.
This is a research reference, not a product offered in the Asciende catalog. Published studies do not establish the identity, purity or availability of a commercial preparation.
Local signaling and experimental context
Record where and how the measurement was made. Presence of a peptide in a system does not establish that a commercial preparation reproduces that system.
- Does the work study an isolated molecule, endogenous secretion or a preparation containing several components?
- Are tissue, species and response measurement specified?
- Does the interpretation distinguish signal detection from demonstration of its function in that model?
Mechanism described in the literature
The foundational study documented inhibition of growth hormone secretion in vitro and in rats. In mouse islet models, delta-cell somatostatin has been studied as part of local control of hormone secretion.
Other names in the literature
- Somatostatin
- SST
From isolation to functional verification
The 1973 publication described material isolated from sheep hypothalamus and evaluated it in experimental systems. A synthetic replica also showed activity. Combining isolation and synthesis linked a chemical entity to the observed response rather than attributing it to a complex extract (PMID 4682131).
The islet as a cellular community
A later investigation compared somatostatin-deficient mice and their isolated islets with controls. Insulin and glucagon secretory responses differed despite no equivalent differences in islet size, organization and hormone content. The design separated hormone storage from stimulus-evoked release (PMID 18984743).
What each preparation answers
The initial pituitary system and later pancreatic islet system do not represent one pathway replicated in two places. Cells, measured hormones and controls change. A circulating concentration also cannot replace observation of local cell communication, which was the pancreatic experiment's focus.
Questions and answers
Does greater secretion necessarily mean more stored hormone?
No. The islet study evaluated both and obtained different findings.
Does paracrine mean the signal acts inside the same cell?
No. Here it describes local communication between islet cells, studied through isolated preparations.
Sources
- Hypothalamic polypeptide that inhibits the secretion of immunoreactive pituitary growth hormone. — Science, 1973
- Hypothalamic polypeptide that inhibits the secretion of immunoreactive pituitary growth hormone.
- Somatostatin secreted by islet delta-cells fulfills multiple roles as a paracrine regulator of islet function. — Diabetes, 2009
- Somatostatin secreted by islet delta-cells fulfills multiple roles as a paracrine regulator of islet function.