Secretin is a hormone produced in the small intestine that plays an important role in the digestive process. It is released in response to the presence of food in the stomach, stimulating the release of digestive juices from the pancreas and the liver. Secretin is also involved in regulating the pH of the small intestine, and it helps to control the transport of nutrients from the small intestine into the bloodstream. Secretin is one of many hormones made by the endocrine system, which works together with the nervous system to maintain homeostasis in the body. It is most commonly used to diagnose pancreatic and intestinal disorders, including pancreatic insufficiency, bile acid malabsorption, and cystic fibrosis. It can also be used to diagnose abnormal secretin production, which can be caused by certain tumors, and to treat intestinal disorders such as chronic diarrhea. In addition, secretin has been studied as a potential treatment for autism, although its effectiveness in this area is still being studied.
Secretin is both a naturally occurring hormone and a medication used for diagnostic purposes. Here's a breakdown of its key functions:
Natural Hormone:
- Produced by S cells in the duodenum (upper part of the small intestine) [1, 2].
- Plays a vital role in digestion by stimulating the pancreas to release bicarbonate-rich fluids [1, 2].
- Bicarbonate helps neutralize stomach acid and create an optimal environment for enzymes to break down food.
Medicinal Use:
- Synthetic version of secretin is used as a diagnostic aid for pancreatic and digestive disorders [2, 3].
- How it helps diagnose:
- Secretin injection stimulates the pancreas to release its digestive juices. Doctors can then assess the volume, composition, and enzyme content of these fluids to identify potential problems with the pancreas [2, 3].
- This can be helpful in diagnosing conditions like:
- Pancreatitis (inflammation of the pancreas) [2]
- Cystic fibrosis (genetic disorder affecting digestion) [2]
- Pancreatic cancer [4]
- Secretin may also be used during endoscopic procedures to help visualize the opening of the pancreatic duct [3].
Administration:
- Secretin is typically given as an injection into a vein (intravenously) in a hospital or clinic setting [2, 3].
Important Points:
- Secretin is not a treatment for any medical condition. It's solely used as a diagnostic tool [2].
- This medication may not be suitable for everyone. It's crucial to discuss your medical history with your doctor before receiving secretin [2].
Additional Information:
- Secretin can also stimulate the stomach to release gastrin, another digestive hormone [2]. This property can be helpful in diagnosing gastrinoma, a tumor that produces excess gastrin [5].