It's because he was diagnosed before with sarcoidosis. It can have an impact on both vitamin D and calcium. Which is plausibly why she tried using those agents

It's because he was diagnosed before with sarcoidosis. It can have an impact on both vitamin D and calcium. Which is plausibly why she tried using those agents to poison him: instead of being suspicious it was seen as a very complicated medical case. Here's what I asked sonnet for a friend: --- Here's an ASCII diagram illustrating the relationship: Sarcoidosis | v Granulomas | v 1-alpha-hydroxylase ↑ | v 25(OH)D ---------> 1,25(OH)2D ↑ ^ | | v Vitamin D3 <-------- Calcium absorption ↑ | v Serum Calcium ↑ | v Hypercalcemia Explanation for a 3rd-year medical student: - Sarcoidosis is a granulomatous disease characterized by the formation of granulomas in various organs, particularly the lungs. - These granulomas contain activated macrophages that express high levels of 1-alpha-hydroxylase, the enzyme responsible for converting 25-hydroxyvitamin D (25(OH)D) to its active form, 1,25-dihydroxyvitamin D (1,25(OH)2D). - The increased 1-alpha-hydroxylase activity leads to excessive production of 1,25(OH)2D, which is not regulated by the normal feedback mechanisms. - 1,25(OH)2D enhances intestinal calcium absorption and bone resorption, leading to increased serum calcium levels. - This process can result in hypercalcemia, a common complication in sarcoidosis patients. - The excess 1,25(OH)2D also suppresses parathyroid hormone (PTH) production, which normally regulates calcium homeostasis. - Importantly, the increased 1,25(OH)2D levels are not dependent on vitamin D intake or sun exposure, as the conversion occurs independently of the body's vitamin D status. - This dysregulation can lead to a paradoxical situation where patients with sarcoidosis may have high 1,25(OH)2D levels but low or normal 25(OH)D levels. Key points to remember: - Granulomas in sarcoidosis are the source of increased 1-alpha-hydroxylase activity. - This leads to excessive 1,25(OH)2D production, independent of normal regulatory mechanisms. - The result is increased calcium absorption and potential hypercalcemia. - Management often involves limiting calcium and vitamin D intake, and in some cases, using corticosteroids to suppress granuloma activity.