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Hypophosphatasia (/ ˌ h aɪ p oʊ ˈ f ɒ s f eɪ t ˌ eɪ ʒ ə /; also called deficiency of alkaline phosphatase, phosphoethanolaminuria, [5] or Rathbun's syndrome; [1] sometimes abbreviated HPP [6]) is a rare, and sometimes fatal, inherited [7] metabolic bone disease. [8]
Symptoms may include weakness, trouble breathing, and loss of appetite. [1] Complications may include seizures, coma, rhabdomyolysis, or softening of the bones. [1] Causes include alcohol use disorder, refeeding in those with malnutrition, recovery from diabetic ketoacidosis, burns, hyperventilation, and certain medications. [1]
It was then licensed by the US Food and Drug Administration in June 2018 [41] Burosumab is shown to target the major symptoms of XLH by decreasing elevated alkaline phosphatase and normalizing severe hypophosphatemia, leading to substantial improvement of rickets in child and adolescent patients.
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The enzyme alkaline phosphatase (ALP, alkaline phenyl phosphatase) is a phosphatase with the physiological role of dephosphorylating compounds. The enzyme is found across a multitude of organisms, prokaryotes and eukaryotes alike, with the same general function, but in different structural forms suitable to the environment they function in. Alkaline phosphatase is found in the periplasmic ...
[8] [9] The Stenciling Principle for mineralization is particularly relevant to the osteomalacia and odontomalacia observed in hypophosphatasia (HPP) and X-linked hypophosphatemia (XLH). The most common cause of osteomalacia is a deficiency of vitamin D, which is normally derived from sunlight exposure and, to a lesser extent, from the diet. [10]
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Alpha-fetoprotein (AFP) is significantly expressed in foetal liver. However, the mechanism that led to the suppression of AFP synthesis in adults is not fully known. Exposure of the liver to cancer-causing agents and arrest of liver maturation in childhood can lead to the rise in AFP. AFP can reach until 400–500 μg/L in hepatocellular ...