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Regulation of Hormone Secretion

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Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
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Hormones regulate a significant portion of digestion through activation of the neuroendocrine system. The neuroendocrine system of digestion contains many different hormones all with multiple functions that are both, directly and indirectly, involved in digestion.
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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
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Related Experiment Video

Updated: Jan 8, 2026

Regulation of Hormone Secretion
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Increased biliary lipid secretion in celiac disease.

M Vuoristo, T A Miettinen

    Gastroenterology
    |January 1, 1985
    PubMed
    Summary

    Celiac disease increases cholesterol secretion into bile and the gut, which is normalized by a gluten-free diet. This enhanced cholesterol output is balanced by increased cholesterol synthesis.

    Area of Science:

    • Gastroenterology and Hepatology
    • Lipid Metabolism and Biliary Physiology

    Background:

    • Celiac disease is associated with an enhanced flux of cholesterol into the gut.
    • The precise origin of this increased cholesterol flux (biliary vs. mucosal) in celiac patients requires clarification.

    Purpose of the Study:

    • To investigate whether increased biliary cholesterol output or mucosal cholesterol secretion contributes to enhanced gut cholesterol flux in celiac disease.
    • To assess the impact of a gluten-free diet on these parameters.

    Main Methods:

    • Direct measurements of biliary lipid outputs, cholesterol absorption, and fecal steroids in celiac patients.
    • Studies were conducted both before and during a gluten-free diet intervention.

    Main Results:

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    Last Updated: Jan 8, 2026

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    • Bile flow rate and secretion of biliary cholesterol, phospholipids, and bile acids were significantly elevated in celiac disease, normalizing with a gluten-free diet.
    • Intestinal mucosal cholesterol secretion was significant but not consistently increased. Fractional cholesterol absorption was low, but total absorbed cholesterol remained normal due to increased biliary secretion.
    • Fecal neutral steroids, cholesterol synthesis, and bile acid absorption were markedly increased in celiac disease, suggesting effective ileal bile acid conservation contributes to biliary cholesterol secretion.

    Conclusions:

    • Enhanced biliary cholesterol output and increased cholesterol synthesis are key features of celiac disease, normalized by a gluten-free diet.
    • Intestinal mucosal secretion plays a role, but biliary output is a primary driver of increased gut cholesterol.
    • Further research is needed to elucidate the regulatory mechanisms linking cholesterol synthesis and lipoprotein metabolism in celiac disease.