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Cholecystokinin (CCK) – Hormone & Digestion

Cholecystokinin (CCK) is a digestive hormone produced in the small intestine that stimulates the gallbladder and pancreas and signals satiety to the brain after meals.

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Things worth knowing about "Cholecystokinin"

Cholecystokinin (CCK) is a digestive hormone produced in the small intestine that stimulates the gallbladder and pancreas and signals satiety to the brain after meals.

What is Cholecystokinin?

Cholecystokinin (abbreviated CCK) is a peptide hormone primarily produced in the small intestine. It plays a central role in the digestion of fats and proteins and also regulates the feeling of fullness after eating. The name derives from Greek and roughly translates to “gallbladder mover.”

Where is CCK Produced?

CCK is mainly secreted by specialized cells in the lining of the small intestine known as I-cells. These cells release CCK into the bloodstream when digested fats and proteins enter the upper part of the small intestine (the duodenum and jejunum). CCK is also found in the central nervous system, where it acts as a neurotransmitter.

Mechanism of Action

CCK binds to specific receptors called CCK-A and CCK-B receptors, found in various organs throughout the body. Its key effects include:

Gallbladder: CCK triggers the contraction of the gallbladder, releasing bile acids into the small intestine. Bile acids are essential for breaking down dietary fats.
Pancreas: CCK stimulates the pancreas to secrete digestive enzymes that break down fats, proteins, and carbohydrates in the small intestine.
Stomach: CCK slows gastric emptying, allowing more time for digestion to occur before food moves into the intestine.
Brain: CCK acts on the hypothalamus and the vagus nerve to convey the feeling of satiety. It is one of the most important physiological signals that suppress hunger following a meal.

Medical Significance

Digestive Disorders

Impaired CCK secretion can lead to problems with fat digestion. Since CCK stimulates gallbladder contraction, reduced CCK activity can contribute to the formation of gallstones, as the gallbladder contracts less frequently and bile becomes more concentrated.

Appetite Regulation and Obesity

CCK is an extensively studied molecule in the field of appetite regulation. Research suggests that disrupted CCK signaling may be associated with obesity. Pharmacological approaches targeting CCK receptors are being investigated as potential therapies for weight management.

Anxiety and Mental Health

Because CCK also functions as a neurotransmitter in the brain, it has been linked to anxiety disorders and panic attacks. CCK-B receptor antagonists are being studied as possible treatments for anxiety-related conditions.

Diagnostic Use

Synthetic CCK (e.g., sincalide) is used in clinical medicine to assess gallbladder and pancreatic function. It is administered intravenously, and the response of the organs is monitored using imaging techniques such as ultrasound or scintigraphy.

Factors Influencing CCK Levels

Several factors can affect CCK secretion:

Diet: Meals rich in fat and protein trigger the strongest CCK release.
Dietary fiber: Certain types of fiber can enhance CCK secretion and prolong satiety.
Sleep and stress: These factors can influence CCK activity and, consequently, appetite regulation.

References

Dockray, G. J. (2012). Cholecystokinin. Current Opinion in Endocrinology, Diabetes and Obesity, 19(1), 8–12. PubMed PMID: 22157400.
Rehfeld, J. F. (2017). Cholecystokinin – From Local Gut Hormone to Ubiquitous Messenger. Frontiers in Endocrinology, 8, 47. PubMed PMID: 28344573.
Guyton, A. C. & Hall, J. E.: Textbook of Medical Physiology, 14th Edition, Elsevier Saunders, Philadelphia.

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