Somatostatin-containing D cells exhibit immunoreactivity for rat somatostatin cryptic peptide in six mammalian species |
| |
Authors: | I. M. Varndell K. L. Sikri R. J. Hennessy M. Kalina R. H. Goodman R. Benoit A. R. Diani Professor J. M. Polak |
| |
Affiliation: | (1) Department of Histochemistry, Royal Postgraduate Medical School, Hammersmith Hospital, London, UK;(2) Department of Histology and Cell Biology, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel;(3) Department of Medicine, Endocrine Division, Tufts New England Medical Center, Boston, Massachusetts, USA;(4) The Montreal General Hospital Research Institute, Montreal, Quebec, Canada;(5) Diabetes and GI Diseases Research Group, The Upjohn Company, Kalamazoo, Michigan, USA;(6) Department of Histochemistry, Royal Postgraduate Medical School, Hammersmith Hospital, Du Cane Road, W12 OHS London, UK |
| |
Abstract: | Summary Antisera raised against rat somatostatin cryptic peptide (RSCP; corresponding to amino acids 63–77 of rat pro-somatostatin), somatostatin-28-(1–12) and somatostatin-28-(17–28) were used to compare the morphological distribution of these pro-somatostatin-derived sequences within the gastroenteropancreatic system of six mammalian species, including man. Using the immunogold staining procedure, RSCP, SS28-(1–12) and SS28-(17–28) immunoreactivity was found to be present in all the D cells of the tissues investigated. Extra-islet RSCP and SS28-(1–12) immunoreactive cells were also identified in some species. RSCP, SS28-(1–12) and SS28-(17–28) immunoreactivities were also present in a single case of human duodenal somatostatinoma. Immunostaining of serial ultrathin sections from all specimens in this study revealed that RSCP and both somatostatin immunoreactivities were co-localised in a majority of the reactive cells. Corroborative evidence was obtained by double immunogold staining which further showed that RSCP, SS28-(1–12) and SS28-(17–28) immunoreactivities were co-localised to individual secretory granules in D type cells, both normal and tumour. RSCP and SS28-(17–28) immunoreactivities were invariably co-localised, whereas SS28-(1–12) immunoreactivity was restricted to a sub-population of secretory granules.Our findings suggest that RSCP immunoreactivity is conserved in a number of mammalian species and is stored in each secretory granule type. Consequently, detection of the RSCP sequence may serve as a useful marker for somatostatin-producing systems throughout the diffuse neuroendocrine system. |
| |
Keywords: | Electron immunocytochemistry Gastro-entero-pancreatic endocrine system Gut Pancreas Prosomatostatin Rat somatostatin cryptic peptide (RSCP) Rat somatostatin-28 |
本文献已被 SpringerLink 等数据库收录! |
|