Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UNIPROT:P01350 (gastrin)
 9,683 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Biochemical assays on microdissected samples, denervation studies, subcellular fractionation, and light and electron microscopic autoradiography of high affinity uptake have been performed to study the cellular localization of transmitter candidates in the rat hippocampal formation. High affinity uptake of glutamate and aspartate is localized in the terminals of several excitatory systems, such as the entorhino-dentate fibres (perforant path), mossy fibres (from granular cells) and pyramidal cell axons. Thus, in stratum radiatum and oriens of CA1, 85% of glutamate and asparate uptake and 40% of glutamate and aspartate content are lost after lesions of ipsilateral plus commissural fibres from CA3/CA4. Hippocampal efferents also take up aspartate and glutamate, since these activities are heavily reduced in the lateral septum and mamillary bodies after transection of fimbria and the dorsal fornix. The synthesis (by glutamic acid decarboxylase), content and high affinity uptake of gamma-aminobutyrate (GABA) are not reduced after lesions of these or other projection fibre systems. A localization in intrinsic neurons is confirmed by a selective loss of glutamic acid decarboxylase after local injections of kainic acid. Peak concentrations of the enzyme occur near the pyramidal and granular cell bodies, corresponding to the site of the inhibitory basket cell terminals, and in the outer parts of the molecular layers. Some 85% of glutamic acid decarboxylase is situated in 'nerve ending particles'. Acetylcholine synthesis (by choline acetyltransferase) disappears after lesions of septo-hippocampal fibres. Since 80% of the hippocampal choline acetyltransferase is in 'nerve ending particles', the characteristic topographical distribution of this enzyme should reflect the distribution of cholinergic septo-hippocampal afferents. Serotonin, noradrenaline, dopamine and histamine are located/synthesized in afferent fibre systems. Some monoamine-containing afferents to the hippocampal formation pass via the septal area, others via the amygdala. The hippocampal formation also contains nerve elements reacting with antibodies against neuroactive peptides, such as enkephalin, substance P, somatostatin and gastrin/cholecystokinin.
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PMID:Localization of putative transmitters in the hippocampal formation: with a note on the connections to septum and hypothalamus. 3 19

A 39-year-old bus driver had been suffering for 2 years from a malignant polypoid mucosal proliferation of the upper nasal concha-ethmoid region, resembling a highly differentiated, villous-glandular adenocarcinoma of enteric type. There were numerous mono- and amphicrine cells and a massive quantity of oxyphilic, frequently Paneth-like goblet cells in the tumor. Immune-histochemically, a number of gastrin- and fewer glucagon-positive cells were identified. The somatostatin level in the serum was clearly increased. Electron-microscopically, 7 different endocrine cell types were identifiable, in order of decreasing frequency: A-like- and G-cells, both types of 5-HT-cells, A-cells, EG- and K-cell-like elements. Particularly impressive were the muco-argyrophilic amphicrine cells, containing A-granules. The unusual enteric character of the carcinoma seems to result from boundary movements and tissue displacements in an ecto-entodermal embryonic border region. There was no history of occupational wood dust inhalation.
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PMID:Endocrine-amphicrine enteric carcinoma of the nasal mucosa. 15 75

Endocrine tumours (argyrophil cell carcinoids) are frequent in the oxyntic mucosa of mastomys. The tumour is notable for its high histamine content and for its high histidine decarboxylase activity. The tumour is thought to arise from the histamine-storing, enterochromaffin-like cells of the oxyntic mucosa. They are of two ultrastructurally distinguishable types, ECL cells and A-like cells, both of which have been demonstrated in the tumour. Identical cells have been demonstrated in the oxyntic mucosa of the rat; there is much evidence that in this species the functional activity and the number of these cells are determined by the serum gastrin concentration. However, tumours have never been found to arise from these cells in the rat. As an initial step in an attempt to explain the formation of the gastric endocrine tumour in the mastomys we examined the distribution and frequency of occurrence of endocrine cells in the mastomys stomach. Gastrin cells in the antrum of mastomys seemed to occur in about the same frequency as in the antrum of rat and mouse. 5-HT-storing enterochromaffin cells, however, were considerably more numerous in the mastomys, whereas the somatostatin cells in the antrum were fewer. The number of enterochromaffin-like cells and somatostratin cells in the oxyntic mucosa of mastomys was much lower than in the rat and mouse. Once developed, the gastric endocrine tumour seems to reduce the antral gastrin cell number; the larger the tumour the greater the reduction.
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PMID:Spontaneous argyrophil cell carcinoid in the glandular stomach: immunohistochemical study of gastric endocrine cells in normal and tumour-bearing mastomys. 38 3

The research was carried out on the vorestomachs, abomasum and on the various tracts of gut of adult Cattle, Sheep and Goat, because Ruminants, not previously studied with respect to this problem, have, as is well known, particular morpho-functional characteristics of the digestive system. The results can be synthetized as follows: 1) either "EC" (5-HT-producing) or "APUD" cells (peptide hormones-producing) are not demonstrable in the vorestomachs. 2) "EC" cells are present in the various areas of abomasum (particularly numerous in the fundus glands) and in the different tracts of the gut (predominantly in the duodenum and in the rectum). 3) In the "APUD" cells of the abomasum gastrin-producing "G" cells are certainly demonstrable. They are present only in the pyloric glands, where they prevail in the middle third. Only in the cattle, cells which have all the histochemical characteristics of "G" cells, but are quite morphologically different, are also present in the same area. An interesting peculiarity seems to be the reduced number of "APUD" cells, compared with that of Monogastrics: it was impossible, in fact, to demonstrate some cells ("A", "A-like","X", "D", "D1", "ECL") which are described by other Authors in the stomach of various Mammals. 4) In the small intestine, endocrine cells, probably heterogenous are present, resulting more numerous in the duodenum. 5) In the coecum, colon and rectum, cells comparable to enteroglucagon-producing "EG" cells, are present; they are particularly numerous in the rectum, where cells similar to "H" cells are also present.
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PMID:[Distribution of the enterochromaffin ("EC") cells and those of the "APUD" series in the gastrointestinal tract of ruminants]. 102 37

Based on morphological and histochemical data, the Authors describe the distribution of "EC" (5-HT-producing) and of the other endocrine cells of the "APUD" series (polypeptide hormone-producing) in the gastro intestinal tract of weaned and unweaned 3-4 month old calves. The results demonstrate that: -- no difference concerning the different diet can be correlated; -- no endocrine cell is present in the vorestomachs; -- the "EC" cells in the abomasum prevail in the fundus glands; they are demonstrable also in every tract of the intestine and are more numerous in the duodenum and in the rectum; -- within the "APUD" series four cellular types are demonstrable in the abomasum; two are in the cardias, one in the fundus and one in the pylorus glands; the last one probably corresponds to the gastrin-producing "G" cells. -- In the small intestine, particularly numerous in the duodenum, a probably heterogeneous family of endocrine cells is present, while in the coecum, in the colon and, above all, in the rectum, cells probably corresponding to "EG" cells are identifiable. These results are compared to those previously obtained in the adult Cattle: remarkable differences are demonstrable only within "APUD" cells of abomasum.
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PMID:[Distribution of the enterochromaffin ("EC") cells and those of the "APUD" series in the gastrointestinal tract of the calf]. 102 38

50 adult Wistar male rats were used and divided into 4 groups, i.e. normal control group, experimental Spleen Deficiency group induced by rhubarb, spontaneous recovery group and therapeutic group treated with Chinese recipe (Si Jun Zi decoction). All the animals of the 4 groups were killed simultaneously, and the jejunum and ileum were removed and processed for demonstration of gastrin cells and 5-HT cells according to immunohistochemical PAP technique. In addition, HE stained samples were prepared. The immunoreactivities of the two types of enteroendocrine cells were observed and semiquantitative estimation were performed under light microscopy. In addition, the immunoreactivities of 5-HT cells in normal control and experimental Spleen Deficiency group were measured by microspectrocytophotometer (MPV 2, Leitz). All the data were treated statistically. This study revealed that there were no obvious histological changes in the mucosa among the 4 groups. In the jejunum, the percentage of gastrin cells(+) in experimental Spleen Deficiency group was more than that of the normal control group, while the percentage of gastrin cells( ) was less than that of the normal control group. As compared with spontaneous recovery group, it showed contrary to the above result in the therapeutic group. No gastrin cells were found in the ileum in all the 4 groups. the percentage of 5-HT cells did not show significant changes in the jejunum and ileum among the 4 groups. But immuno-reactivity in the 5-HT cell was less than that of the normal control group in the jejunum of the Spleen Deficiency group.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:[Immunohistochemical study on the enteroendocrine cells of the small intestine in experimental spleen deficiency syndrome in rats]. 147 6

The distribution and the morphology of some endocrine cells (gastrin, somatostatin and 5-HT immunoreactive) in the pyloric region were studied in the Talpa europaea, an insectivore representing one of the most primitive living Eutherians. The immunohistochemical studies enabled us to identify and calculate the percentage of each cell type: the most numerous endocrine cells were gastrin immunoreactive; fairly numerous appeared somatostatin immunopositive; less numerous were 5-HT immunoreactive cells. While the ultrastructural observations let us describe four endocrine cell types: G cells producing gastrin, D cells containing somatostatin, EC cells of the gastric type producing 5-HT and D1 cells whose content is still unknown.
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PMID:[Immunohistochemical and ultrastructural study of endocrine cells from the pyloric region of the European mole (Talpa europaea)]. 168 97

Serotonin-producing pancreatic endocrine tumours are rare neoplasms which in most cases exhibit malignant biological behaviour. These tumours, in the majority of the well-documented cases, are composed of argyrophil- and argentaffin-positive cells which contain large pleomorphic neurosecretory granules. In contrast, argyrophilic non-argentaffin pancreatic endocrine tumours with tumour cells containing round neurosecretory granules are exceptional. In this study we describe such a tumour not associated with clinical evidence of carcinoid syndrome in a 60-year-old woman. Histological examination revealed tumour extension in pancreatic lymphatic vessels and veins but no evidence of locoregional or distant metastases. Ten months after surgery the patient showed no recurrence of the disease. Immunohistochemistry revealed cytoplasmic serotonin production in the tumour cells which were negative for anti-gastrin, insulin, glucagon, somatostatin, pancreatic polypeptide (PP), vasoactive intestinal peptide (VIP) and ACTH. This study emphasizes the usefulness of combined ultrastructural and immunohistochemical investigations in order to identify and characterize the rare pancreatic endocrine tumours with serotonin production.
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PMID:Serotonin-producing pancreatic endocrine tumour. Histological, ultrastructural and immunohistochemical study of a case. 196 80

The endocrine cells in the gastrointestinal tract of the musk shrew were studied immunohistochemically. Eleven kinds of endocrine cells, immunoreactive for serotonin, somatostatin, gastrin, cholecistokinin, gastric inhibitory polypeptide, motilin, secretin, neurotensin, pancreatic glucagon, enteroglucagon and bovine pancreatic polypeptide, were revealed. In the stomach, serotonin-, somatostatin-, gastrin-, pancreatic glucagon- and enteroglucagon-immunoreactive cells were detected. The first three types of cells predominated and were more abundant in the pyloric glands than in the other stomach regions. In the small intestine, all types of endocrine cells were found, each having different distributions and relative frequencies. In the large intestine, 10 types of endocrine cells except cholecystokinin-immunoreactive cells were detected. Serotonin- and bovine pancreatic polypeptide-immunoreactive cells were more numerous in the large intestine than in the small intestine.
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PMID:An immunohistochemical study on the distribution of endocrine cells in the gastrointestinal tract of the musk shrew, Suncus murinus. 213 60

The reproductive system of the monogenean gill parasite, Diclidophora merlangi, was examined for the presence of cholinergic, serotoninergic and peptidergic innervation using cytochemical and immunocytochemical techniques. Cholinesterase activity and 5-hydroxytryptamine immunoreactivity (5-HT-IR) were confined to neural elements of the male reproductive system, being evident in the innervation of the cirrus, whereas only 5-HT was present in nerves and somata of the elongate seminal vesicle. Peptidergic innervation was localised to both the male and female reproductive systems of the worm. Within the female reproductive apparatus pancreatic polypeptide, peptide tyrosine tyrosine, neuropeptide Y, substance P, neurokinin A, eledoisin, FMRFamide and gastrin/cholecystokinin immunoreactive fibres and somata were observed in the oviduct, vitelline reservoir and ovovitelline duct. Intense peptide immunoreactivity was identified in fibres in the wall of the ootype and in a surrounding population (greater than 100) of somata that were situated beyond Mehlis' gland cells and all of which were connected to the ootype wall by fine cytoplasmic connectives. The strategic location of this peptidergic cell population infers its involvement in the egg-forming sequence in this platyhelminth parasite.
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PMID:A cytochemical study of the serotoninergic, cholinergic and peptidergic components of the reproductive system in the monogenean parasite, Diclidophora merlangi. 219 Dec 87


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