5: Congenital rickets a premature infant: evolution of serum parathyroid hormone (iPTH) and plasma 25 hydroxycholecalciferol (25 OH CC)

Maternal and neonatal 25-OH cholecalciferol (25-OH-CC) levels.

We also studied this relation more than 30 years ago in 60 pairs of maternal and cord blood, and showed such a relation; ours was one of the first published studies on this subject2. Calcium, phosphorus, and alkaline phosphate levels were also assayed, and were repeated in babies of about one month of age. Maternal and cord 25-OH-CC levels were found lowest in winter months when compared to mot...

Reduction of Saliva and Serum 25-Hydroxycholecalciferol in Multiple Sclerosis

Methods: The prevalence of multiple sclerosis (MS) is high in patients suffering from 25-hydroxyvitamin D3 [25(OH)D] deficiency. The aim of this study was to investigate the possible association of saliva and serum 25(OH)D concentrations with MS in women.Methods: Serum and saliva 25(OH)D levels of 30 MS women and 30 matched healthy controls in this case-control study were measured by ELIS...

Control of 25-hydroxycholecalciferol metabolism by parathyroid glands.

Thyroparathyroidectomy of rats on a diet low in calcium reduces production of 1,25-dihydroxycholecalciferol from 25-hydroxycholecalciferol to negligible levels within 40 hr, and increases production of another metabolite, called Va. Parathyroid extract, at a dose of 20 units per day, prevents these changes. When 40 units per day of parathyroid extract is given 48 hr after thyroparathyroidectomy...

Serum 25-hydroxyvitamin D and parathyroid hormone exhibit threshold behavior.

Inhibition of parathyroid hormone secretion by 25-hydroxycholecalciferol and 24,25-dihydroxycholecalciferol in the dog.

We studied the effects of vitamin D metabolites on parathyroid hormone (PTH) secretion. Test materials were injected into the cranial thyroid artery of the dog, and immunoreactive PTH was measured frequently in serum samples from the inferior thyroid vein and the femoral vein. This model for the study of secretion had previously been validated with the use of known modulators on PTH secretion. ...