Endocrine Abstracts

The vitamin D endocrine system (D-endo) is essential for calcium and bone homeostasis. Absence of a functional VDR or CYP27B1 creates a severe rachitic bone and growth plate phenotype in humans and mice as in severe vitamin D deficiency. The intestine is the key target for VDR as a high calcium intake or selective VDR rescue in the intestine restores a normal bone and growth plate phenotype. Selective absence of VDR in osteoblasts does not create a bone phenotype when calcium ...

The occurrence of vitamin D (vitD) insufficiency (plasma 25OHD<50 nmol/l) and deficiency (25OHD<25 nmol/l) in primary hyperparathyroidism (PHPT) varies worldwide in prevalence, severity and symptoms. Epidemiological studies support that the clinical presentation of PHPT is more severe in patients with coexisting vitD deficiency. Most PHPT patients in Europe only have slightly decreased plasma 25OHD levels compared with gender-, age- and season matched controls, and sev...

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