Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0020438 (hypercalciuria)
 2,502 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

We report the case of a 5-year-old boy with mitochondrial cytopathy due to a partial deficiency of cytochrome c oxidase who had isolated proximal renal tubular acidosis and hypercalciuria. The patient developed hypotonia and blepharoptosis and exhibited growth retardation. Biochemical examination of muscle tissue revealed a partial deficiency of cytochrome c oxidase. He was treated with an alkali, hydrochlorothiazide, and indomethacin. After treatment, metabolic acidosis and hypercalciuria improved, and the patient had a catch-up growth phase. This case emphasizes the importance of performing renal tubular functional investigations and treatment in patients with mitochondrial cytopathy, even in the absence of multiple proximal tubular dysfunction.
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PMID:Partial deficiency of cytochrome c oxidase with isolated proximal renal tubular acidosis and hypercalciuria. 133 58

A 2-year-old boy who developed hypophosphatemic rickets without signs of muscular weakness or neurological disturbances is presented. Biochemical findings included hypophosphatemia, metabolic acidosis, hypouricemia, hyperphosphaturia, severe glucosuria, generalized hyperaminoaciduria, hypercalciuria, proteinuria with elevated excretion of IgG, transferrin, albumin and high levels of alpha-1-microglobulin. Urine concentration capacity and creatinine clearance were normal. Lactaturia without elevated levels of plasma lactate and a high urinary excretion of beta-hydroxybutyrate were suggestive for mitochondriopathy. Partial deficiency of cytochrome c oxidase (complex IV of the respiratory chain) was found in skeletal muscle. A renal biopsy specimen demonstrated enlarged mitochondria with abnormal arborization and disorientation of the cristae in the proximal tubular cells. Reduced activity of mitochondrial cytochrome c oxidase in tubular cells could be demonstrated by ultracytochemistry. In conclusion, rickets due to the renal Fanconi syndrome can be the first clinical sign of mitochondrial cytopathies without extra-renal symptoms. Elevated excretion of lactate and ketone bodies in urine may serve as a diagnostic marker.
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PMID:Renal Fanconi syndrome: first sign of partial respiratory chain complex IV deficiency. 1087 93