intrinsic factor
Noun: A glycoprotein produced by the gastric mucosa (the lining of the stomach). Its essential biological function is to bind with vitamin B12 (cobalamin) ingested from food. This binding is crucial for the subsequent absorption of the vitamin in the ileum, the final section of the small intestine.
The term "intrinsic factor" is used almost exclusively in medical, biological, and nutritional contexts to describe this specific protein and its critical role in vitamin B12 metabolism. * The body's ability to absorb dietary vitamin B12 is dependent on intrinsic factor. * A deficiency in intrinsic factor is the primary cause of pernicious anemia. * The test measures the level of antibodies against intrinsic factor.
- Autoimmune Destruction: In the autoimmune condition pernicious anemia, the body's immune system mistakenly produces antibodies that attack and destroy the parietal cells in the stomach that produce intrinsic factor, or the intrinsic factor molecule itself.
- Gastric Bypass Surgery: Surgical procedures that remove or bypass the part of the stomach that produces intrinsic factor can lead to a functional deficiency, requiring lifelong B12 supplementation.
- Intrinsic Factor Antibody (IFAB): An autoantibody, often tested for in diagnostics, that targets intrinsic factor.
- Parietal Cell: The specific type of cell in the gastric glands responsible for secreting both hydrochloric acid and intrinsic factor.
There are no direct common synonyms for "intrinsic factor" as it is a precise scientific term. It may be descriptively referred to as: * The gastric intrinsic factor * The B12-binding protein
- Lack of intrinsic factor: The condition leading to malabsorption.
- Intrinsic factor deficiency: The medical state of having insufficient intrinsic factor.
- Bound to intrinsic factor: Describes the state of vitamin B12 as it is transported for absorption.
- Vitamin B12 (Cobalamin): The essential nutrient whose absorption is mediated by intrinsic factor.
- Pernicious Anemia: A type of megaloblastic anemia primarily caused by a lack of intrinsic factor.
- Malabsorption: The impaired absorption of nutrients, which in this case specifically refers to B12.
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a substance produced by the mucosa of the stomach and intestines that is essential for the absorption of vitamin B12
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lack of intrinsic factor can result in pernicious anemia
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