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Journal Article
Research Support, Non-U.S. Gov't
Low bone mineral density is a common feature of Zellweger spectrum disorders.
Molecular Genetics and Metabolism 2016 January
Patients with Zellweger Spectrum Disorders (ZSDs) have impaired peroxisome biogenesis and severe, multisystem disease. Although the neurologic symptoms of ZSD tend to be the most prominent, patients also have hepatic, renal and adrenal impairment. Little is known about bone health in patients with ZSD, particularly those with mild or moderate presentation. We investigated 13 ZSD patients who had strikingly abnormal bone mineral density for age. DXA scans showed mean lumbar and femoral neck Z-scores of -3.2. There were no major differences between ambulatory and nonambulatory patients, and no biochemical abnormalities consistent with rickets or vitamin D deficiency were seen. Cyclic bisphosphonate therapy in one ZSD patient was successfully used to increase in bone mineral density. Although the etiology of bone disease in this condition is unknown, we speculate that altered signaling through the PPARγ pathway or deficient plasmalogens in patients with ZSD disrupts osteogenesis, resulting in poor bone formation and poor mineralization. Further investigation into the pathogenic mechanisms of bone disease in ZSD and the role of peroxisomal metabolism in osteogenesis may yield insights into the pathology of bone disease and suggest novel treatment options.
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