Abstract
We delineate a complication of hypoalbuminemia in dentatorubral−pallidoluysian atrophy (DRPLA), which we have found to be common in this disorder. In addition, we explored the pathogenesis of this phenomenon through clinical and histological examinations. Clinical course and laboratory findings of nine patients with childhood-onset DRPLA (aged 6–49 years; CAG repeat length 62–93) were retrospectively reviewed. Autopsied specimens from three patients were examined by histopathological and immunohistochemical analyses. Eight DRPLA patients showed hypoalbuminemia <3.5 g/dl in the initial stages of the disease (age, 2–32 years), which correlated with the CAG repeat length in each patient. Disease worsened in six patients, often triggered by febrile infections and accompanied by increased urinary protein excretion. One patient showed increased fecal α1-antitripsin while another showed accumulation of radioactive albumin in the urinary and gastrointestinal tracts after intravenous infusion. Immunohistochemistry revealed albumin-containing monocytes and astrocytes in the perivascular areas of the cerebral white matter. Fluid collection in the glomerular capillaries was noted. Immunolabeling using antibodies against the expanded polyglutamine (polyQ) polypeptide was positive in cerebral cortical neurons, hepatocytes, renal collecting ducts, and glomerular podocytes, which act as filtration barrier against serum proteins. Serum albumin appears to easily leak from blood vessels in certain visceral organs in DRPLA during later stages of the illness, particularly in the kidneys of patients with largely expanded CAG repeats. We hypothesize that the accumulation of the DRPLA gene product with expanded polyQ sequences in the podocytes results in the dysfunction of the glomerular filtration barrier.
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Abbreviations
- DRPLA:
-
Dentatorubral–pallidoluysian atrophy
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Acknowledgments
Each author contributed to this article as stated below. Study concept and design: Saito Yo, Sasaki, Ito S, Matsuoka; Management of each patient and data acquisition: Nagai, Saito Yo, Endo, Saito T, Sugai, Ishiyama, Komaki, Nakagawa, Sasaki; Histological examination of autopsied specimen: Saito Yo, Saito Yu, Sukigara, Ito M, Ito S, Matsuoka; Preparation, execution, and data processing for albumin scintigraphy: Nagai, Ito K; Drafting the manuscript: Nagai, Saito Yo; Critical revision of the manuscript: and Sasaki, Matsuoka K; Obtaining research grant for investigation: Saito Yo. Drs. Saito Yo and Sasaki obtained a Research Grant (24-7) for Nervous and Mental Disorders from the Ministry of Health, Labor, and Welfare of Japan for conducting this study.
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Nagai, S., Saito, Y., Endo, Y. et al. Hypoalbuminemia in early onset dentatorubral−pallidoluysian atrophy due to leakage of albumin in multiple organs. J Neurol 260, 1263–1271 (2013). https://doi.org/10.1007/s00415-012-6787-9
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DOI: https://doi.org/10.1007/s00415-012-6787-9