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Vitamin D-binding protein (DBP), also/originally known as gc-globulin (group-specific component), is a protein that in humans is encoded by the GC gene. [ 5 ] [ 6 ] DBP is genetically the oldest member of the albuminoid family and appeared early in the evolution of vertebrates.
Plasma gelsolin (pGSN) is an 83 kDa abundant protein constituent of normal plasma and an important component of the innate immune system.The identification of pGSN in Drosophila melanogaster [1] and C. elegans [2] points to an ancient origin early in evolution. [3]
Its main function is to regulate the oncotic pressure of blood. [7] The isoelectric point of albumin is 4.7. [8] Alpha-fetoprotein is a fetal plasma protein that binds various cations, fatty acids and bilirubin. Vitamin D-binding protein binds to vitamin D and its metabolites, as well as to fatty acids. Not much is known about afamin.
Vitamin D supplements linked with reduced blood pressure The study included 221 individuals ages 65 and older who were taking vitamin D supplements . They were all classified as having overweight ...
Metabolites produced from vitamin D 2 tend to bind less well to the vitamin D-binding protein. [ 3 ] Vitamin D 3 can alternatively be hydroxylated to calcifediol by sterol 27-hydroxylase (CYP27A1), but vitamin D 2 cannot.
Calcifediol is strongly bound in blood by the vitamin D-binding protein. [5] Measurement of serum calcifediol is the usual test performed to determine a person's vitamin D status, to show vitamin D deficiency or sufficiency. [4] [5] Calcifediol is available as an oral medication in some countries to supplement vitamin D status. [4] [6] [7]
Transcription of the CYP24A1 gene is markedly inducible by 1,25-(OH) 2 D 3 binding to the vitamin D receptor. [6] The gene has a strong, positive vitamin D response element in the promoter . Through regulation of CYP24A1 expression, a negative feedback control system is created to limit the effects of 1,25-(OH) 2 D 3 .
Serum albumin is produced by the liver, occurs dissolved in blood plasma and is the most abundant blood protein in mammals. Albumin is essential for maintaining the oncotic pressure needed for proper distribution of body fluids between blood vessels and body tissues; without albumin, the high pressure in the blood vessels would force more ...