出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2023/02/02 17:27:25」(JST)
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The gastrointestinal hormones (or gut hormones) constitute a group of hormones secreted by enteroendocrine cells in the stomach, pancreas, and small intestine that control various functions of the digestive organs. Later studies showed that most of the gut peptides, such as secretin, cholecystokinin or substance P, were found to play a role of neurotransmitters and neuromodulators in the central and peripheral nervous systems.[1]
Enteroendocrine cells do not form glands but are spread throughout the digestive tract. They exert their autocrine and paracrine actions that integrate gastrointestinal function.[2]
The gastrointestinal hormones[3] can be divided into three main groups based upon their chemical structure.
Ghrelin is a peptide hormone released from the stomach and liver and is often referred to as the "hunger hormone" since high levels of it are found in individuals that are fasting. Ghrelin agonistic treatments can be used to treat illnesses such as anorexia and loss of appetites in cancer patients. Ghrelin treatments for obesity are still under intense scrutiny and no conclusive evidence has been reached. This hormone stimulates growth hormone release.
Amylin controls glucose homeostasis and gastric motility
Glucose-dependent insulinotropic polypeptide possesses an acute influence on food intake through its effects on adipocytes
Oxyntomodulin plays a role in controlling acid secretion and satiation
Hormone or peptide | Molecular weight (Da) | Number of amino acids | Main gut localization | Principal physiologic actions |
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Gastrin family | ||||
Cholecystokinin | 3918 | 33 (also 385, 59) | Duodenum and jejunum, Enteric nerves | Stimulates gallbladder contraction and intestinal motility; stimulates secretion of pancreatic enzymes, insulin, glucagon, and pancreatic polypeptides; has a role in indicating satiety; the C-terminal 8 amino acid peptide cholecystokinin (CCK)-8 retains full activity |
Little gastrin | 2098 | 17 | Both forms of gastrin are found in the gastric antrum and duodenum | Gastrins stimulate the secretion of gastric acid, pepsinogen, intrinsic factor, and secretin; stimulate intestinal mucosal growth; increase gastric and intestinal motility |
Big gastrin | 3839 | 34 | ||
Secretin-glucagon family | ||||
Secretin | 3056 | 27 | Duodenum and jejunum | Stimulates pancreatic secretion of HCO3, enzymes and insulin; reduces gastric and duodenal motility, inhibits gastrin release and gastric acid secretion |
Vasoactive intestinal polypeptide (VIP) | 3326 | 28 | Enteric nerves | Relaxes smooth muscle of gut, blood vessels, and genitourinary system; increases water and electrolyte secretion from pancreas and gut; releases hormones from pancreas, gut, and hypothalamus |
Glucose-dependent insulinotropic | 4976 | 42 | Duodenum and jejunum | Stimulates insulin release; reduces gastric and intestinal motility; increases fluid and electrolyte secretion from small intestine |
Hormone or peptide | Major tissue locations in the gut | Principal known actions |
---|---|---|
Bombesin | Throughout the gut and pancreas | Stimulates release of cholecystokinin (CCK) and gastrin |
Calcitonin gene-related peptide | Enteric nerves | Unclear |
Chromogranin A | Neuroendocrine cells | Secretory protein |
Enkephalins | Stomach, duodenum | Opiate-like actions |
Enteroglucagon | Small intestine, pancreas | Inhibits insulin secretion |
Galanin | Enteric nerves | |
Ghrelin | Stomach | Stimulates appetite, increases gastric emptying |
Glucagon-like peptide 1 | Pancreas, ileum | Increases insulin secretion |
Glucagon-like peptide 2 | Ileum, colon | Enterocyte-specific growth hormone |
Growth factors | Throughout the gut | Cell proliferation and differentiation |
Growth hormone-releasing factor | Small intestine | Unclear |
Leptin | Stomach | Appetite control |
Motilin | Throughout the gut | Increases gastric emptying and small bowel motility |
Neuropeptide Y | Enteric nerves | Regulation of intestinal blood flow |
Neurotensin | Ileum | Affects gut motility; increases jejunal and ileal fluid secretion |
Pancreatic polypeptide | Pancreas | Inhibits pancreatic and biliary secretion |
Peptide YY | Colon | Inhibits food intake |
Somatostatin | Stomach, pancreas | Inhibits secretion and action of many hormones |
Substance P | Enteric nerves | Unclear |
Trefoil peptides | Stomach, intestine | Mucosal protection and repair |
Hormones | |||||||||||||||||||||||||||
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Endocrine glands |
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Other |
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Physiology of the gastrointestinal system | |||||||||||||||||||||||||||||||
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GI tract |
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Accessory |
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Abdominopelvic |
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リンク元 | 「消化管ホルモン」 |
拡張検索 | 「gut hormone-producing tumor」 |
関連記事 | 「gut」「g」 |
名称 | 分泌粘膜部位 | 主な作用 | 分泌刺激 | 分泌細胞 | ||||
胃 | 十二指腸 | 小腸 | ||||||
幽門部 | 上部 | |||||||
ガストリン | ○ | 塩酸・ペプシン分泌↑ 膵酵素分泌↑ |
タンパク質、アルコール、カフェイン | G細胞 | ||||
コレシストキニン | ○ | 膵液分泌(酵素多)↑ | 小腸内タンパク質分解産物、酸、脂肪酸、アルコール | I細胞 | ||||
セクレチン | ○ | ○ | 膵液分泌(HCO3-多)↑ 胃酸分泌↓ |
小腸内ペプチド、酸、アルコール | S細胞 | |||
胃酸分泌抑制ポリペプチド 胃抑制ペプチド GIP |
○ | インスリン分泌↓ | 小腸内の糖質、酸、機械的刺激 | K細胞 | ||||
胃運動・分泌↓ | ||||||||
ソマトスタチン | ○ | ○ | ○ | 消化管運動↓ | ガストリン、セクレチン、コレシストキニン | D細胞 | ||
ガストリン、セクレチン、胃酸分泌↓ | ||||||||
モチリン | ○ | 胃腸運動↑ | 十二指腸内アルカリ性内容物 | MO細胞 |
細胞 | 産生ホルモン | ホルモンの作用 | 局在 | 分泌果粒の 大きさ(nm) | |||
胃 | 小腸 | 大腸 | |||||
A細胞 | グルカゴン エンテログルカゴン | 肝細胞でのグリコーゲン分解を促進し、血糖値を上昇 | ○ | ○ | 250 | ||
D細胞 | ソマトスタチン | 近くの内分泌細胞のホルモン分泌を抑制 | ○ | ○ | ○ | 350 | |
EC細胞 | 腸クロム親和性細胞 | セロトニン、サブスタンスP | 蠕動運動を促進 | ○ | ○ | ○ | 300 |
ECL細胞 | 腸クロム親和性細胞様細胞 | ヒスタミン | 塩酸分泌を促進. | ○ | 450 | ||
G細胞 | ガストリン産生細胞 | ガストリン | 塩酸分泌、胃の運動(特に幽門部の収縮と幽門括約筋の弛緩による胃内容の排出を調整)、および胃体部の幹細胞の増殖 | ○ | ○ | 300 | |
GL細胞 | グリセンチン産生細胞 | グリセンチン | 肝細胞でのグリコーゲン分解を促進し、血糖値を上昇 | ○ | ○ | ○ | 400 |
I細胞 | コレシストキニン | 膵臓の消化酵素分泌と胆嚢の収縮を促進 | ○ | 250 | |||
K細胞 | 胃抑制ペプチド GIP | 塩酸分泌を抑制 | ○ | 350 | |||
MO細胞 | モチリン産生細胞 | モチリン | 腸の蠕動を促進 | ○ | |||
N細胞 | ニューロテンシン産生細胞 | ニユーロテンシン | 回腸ヘの血流を増加させ、小腸と大腸の蠕動運動を抑制 | ○ | 300 | ||
PP細胞 | 膵ポリペプチド産生細胞 | 膵ポリペプチド | 不明 | ○ | ○ | 180 | |
S細胞 | セクレチン | 膵臓からの重炭酸含有液の分泌を促進 | ○ | 200 | |||
VIP細胞 | 血管作動性腸ペプチド産生細胞 | 血管作動性腸ペプチド | 小腸と大腸の蠕動運動を促進し、消化管による水とイオンの排出を促進 | ○ | ○ | ○ |
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