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Calcitriol is not a peptide hormone; it is a steroid hormone and the metabolically active form of vitamin D2024年7月17日—Calcitriol, also known as 1,25-dihydroxyvitamin D3, is the active form of vitamin D in the body. It plays a critical role in maintaining .... This distinction is crucial for understanding its biological functions, synthesis, and how it interacts within the bodyCalcitriol - StatPearls - NCBI Bookshelf - NIH. While it acts as a hormone, its chemical structure and origin differ significantly from peptide hormones like insulin or oxytocin.
Calcitriol, also known scientifically as 1,25-dihydroxycholecalciferol or 1,25(OH)2D3, is the most biologically potent form of vitamin DVitamin D | Hormones. Its journey begins with vitamin D, which can be synthesized in the skin upon exposure to sunlight or obtained through diet. This precursor then undergoes hydroxylation in the liver to become calcidiol (25-hydroxyvitamin D) and subsequently in the kidneys to become calcitriol. This multi-step process highlights calcitriol's role as a hormonally active metabolite.
As a steroid hormone, calcitriol is derived from cholesterol. This chemical classification places it in a different category from peptide hormones, which are composed of amino acids. The steroid structure allows calcitriol to bind to intracellular receptors, primarily the vitamin D receptor (VDR), and influence gene expression. This mechanism is characteristic of steroid hormones and differentiates it from peptide hormones that typically bind to cell surface receptors.
The most well-established function of calcitriol is its critical role in regulating calcium and phosphate homeostasis. It acts to:
* Increase intestinal absorption of calcium and phosphate: This is vital for maintaining adequate levels of these minerals in the bloodstreamThe role of calcium, calcitriol and its receptors in parathyroid ....
* Promote bone mineralization: By ensuring sufficient calcium and phosphate are available, calcitriol supports the formation and maintenance of strong bones.
* Influence kidney reabsorption of calcium: Calcitriol helps the kidneys retain calcium, preventing its loss from the body.Calcitriol, which is also referred to as 1,25-D3,is the hormonally active metabolite of vitamin D. It plays a classical hormonal role in skeletal health to ...
These actions are essential for skeletal health, preventing conditions like rickets in children and osteomalacia in adults.
While its role in calcium metabolism is paramount, research has revealed that calcitriol has broader physiological effects. It is recognized for its:
* Immunomodulatory properties: Calcitriol can influence the immune system, playing a role in innate immunity and potentially modulating inflammatory responses. It has been shown to be involved in the metabolism of antimicrobial peptides.
* Anticarcinogenic potential: Studies suggest calcitriol may have a role in cancer prevention and treatment by influencing cell differentiation and proliferation.
* Other effects: Calcitriol is also associated with antipsoriatic, antioxidant, and mood-regulating effects, although these are areas of ongoing research.作者：R Marcus·1992·被引用次数：24—We evaluated the effects of estrogen on thecalcitriolresponse to the activepeptide, human PTH(1-34), in postmenopausal women. Fifteen women were studied ...
Peptide hormones are synthesized from amino acids and have a different molecular structure and mechanism of action compared to steroid hormones like calcitriol. Peptide hormones, such as parathyroid hormone (PTH), which works closely with calcitriol in calcium regulation, bind to receptors on the cell surface, triggering intracellular signaling cascades. In contrast, calcitriol, as a steroid, can pass through the cell membrane and directly interact with nuclear receptors, altering gene transcription. This fundamental difference in their chemical nature and mode of action underscores why calcitriol is definitively not a peptide hormone作者：R Marcus·1992·被引用次数：24—We evaluated the effects of estrogen on thecalcitriolresponse to the activepeptide, human PTH(1-34), in postmenopausal women. Fifteen women were studied ....
In conclusion, calcitriol is a vital steroid hormone, the active form of vitamin D, indispensable for calcium and phosphate balance and bone health, with emerging roles in immune function and beyond.Calcitriol-modulated human antibiotics Its classification as a steroid hormone is based on its chemical structure and mechanisms of action, clearly distinguishing it from peptide hormonesCalcitriol:Calcitriolis the active form of vitamin D, which is a steroid hormone, not apeptide hormone. Based on the analysis: Oxytocin and Insulin are ....
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