No amelioration of uromodulin maturation and trafficking defect by sodium-4-phenylbutyrate in vivo: Studies in mouse models of uromodulin-associated kidney disease.
J. Biol. Chem. 289, 10715-10726 (2014)
Uromodulin (UMOD)-associated kidney disease (UAKD) belongs to the hereditary progressive ER storage diseases caused by maturation defects of mutant UMOD protein. Current treatments of UAKD patients are symptomatic and cannot prevent disease progression. Two in vitro studies reported a positive effect of the chemical chaperone sodium-4-phenylbutyrate (4-PBA) on mutant UMOD maturation. Thus, 4-PBA was suggested as potential treatment for UAKD. This study evaluated the effects of 4-PBA in two mouse models of UAKD. In contrast to previous in vitro studies, treatment with 4-PBA did not increase HSP70 expression or improve maturation and trafficking of mutant UMOD in vivo. Kidney function of UAKD mice was actually deteriorated by 4-PBA-treatment. In transfected tubular epithelial cells, 4-PBA did not improve maturation, but increased the expression level of both mutant and wild-type UMOD protein. Activation of NF-κB pathway in thick ascending limb of Henle's loop cells of UAKD mice was detected by increased abundance of RelB and phospho-IKKα/β, an indirect activator of NF-κB. Further, the abundance of NF-κB1 p105/p50, NF-κB2 p100/p52 and TRAF2 was increased in UAKD. NF-κB activation was identified as a novel disease mechanism of UAKD and might be a target for therapeutic intervention.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter 4-PBA; Endoplasmic reticulum stress; Genetic diseases; Histone deacetylase inhibitors; Kidney; Molecular chaperone; NF-kappa B (NF-KB); RelB; UAKD; Uromodulin (UMOD); Tamm-horsfall Glycoprotein; Juvenile Hyperuricaemic Nephropathy; Kidney-disease; Endoplasmic-reticulum; Chemical Chaperones; Umod Mutations; Mouse Model; Er Stress; Expression; Phenylbutyrate
ISSN (print) / ISBN 0021-9258
Zeitschrift Journal of Biological Chemistry, The
Quellenangaben Band: 289, Heft: 15, Seiten: 10715-10726
Verlag American Society for Biochemistry and Molecular Biology ; HighWire Press
Institut(e) Institute of Experimental Genetics (IEG)