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Hypoparathyroidism: clinical features, skeletal microstructure and parathyroid hormone replacement
Mishaela R Rubin1, John P Bilezikian
1Departamento de Medicina, Columbia University, Nova York, Estados Unidos.
Arquivos Brasileiros De Endocrinologia E Metabologia
|May 21, 2010
Summary
Parathyroid hormone (PTH) deficiency in hypoparathyroidism causes skeletal abnormalities. PTH(1-84) replacement therapy shows potential to correct these bone issues and lower calcium and vitamin D needs.
Area of Science:
- Endocrinology
- Bone Biology
- Metabolic Bone Disease
Background:
- Hypoparathyroidism is characterized by deficient parathyroid hormone (PTH) circulation, often resulting from autoimmune destruction or surgical removal of parathyroid glands.
- This hormonal deficiency leads to significant alterations in skeletal microstructure and mineral metabolism.
- Understanding these skeletal changes is crucial for developing effective treatment strategies.
Purpose of the Study:
- To define the specific abnormalities in skeletal microstructure associated with hypoparathyroidism.
- To evaluate the potential efficacy of parathyroid hormone (PTH(1-84)) replacement therapy in correcting these skeletal abnormalities.
Main Methods:
- Histomorphometric and micro-computed tomography (microCT) analyses were conducted on iliac crest bone biopsies from hypoparathyroid patients.
- Patients received treatment with parathyroid hormone (PTH(1-84)) for a duration of two years.
- Bone biopsy data were compared to control groups to assess treatment effects.
Main Results:
- Hypoparathyroidism bone biopsies showed increased bone density, greater bone volume fraction (BV/TV), and enhanced trabecular (Tb.Wi) and cortical (Ct.Wi) width, indicative of a low turnover state.
- Markers of bone formation, such as mineralizing surface (MS) and bone formation rate per unit surface (BFR/BS), were suppressed compared to controls.
- PTH(1-84) treatment increased bone turnover and bone mineral density in the lumbar spine, reduced calcium and vitamin D requirements, without altering serum or urinary calcium levels.
Conclusions:
- The abnormal skeletal microstructure in hypoparathyroidism directly reflects the absence of parathyroid hormone (PTH).
- Replacement therapy using PTH(1-84) demonstrates potential in reversing these microstructural abnormalities.
- PTH(1-84) therapy may also decrease the dependence on calcium and vitamin D supplementation in patients with hypoparathyroidism.
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