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  • Abnormal distribution of heterogeneous nuclear ribonucleoproteins in sporadic inclusion body myositis.

Abnormal distribution of heterogeneous nuclear ribonucleoproteins in sporadic inclusion body myositis.

Neuromuscular disorders : NMD (2014-05-27)
Jack L Pinkus, Anthony A Amato, J Paul Taylor, Steven A Greenberg
摘要

Previous histopathologic studies of sporadic inclusion body myositis (sIBM) identified sarcoplasmic aggregation and myonuclear depletion of the predominantly nuclear heterogeneous nuclear ribonucleoprotein (hnRNP) TDP-43 in sIBM myofibers. Here, we examined sIBM muscle for abnormalities in two other hnRNPs hnRNPA1 and hnRNPA2B1, mutations in which cause multisystem proteinopathy associated with rimmed-vacuolar myopathies. Muscle biopsy specimens from 13 patients with sIBM and 13 patients without sIBM (dermatomyositis N=3, polymyositis N=3, muscular dystrophy N=3, motor neuron disease N=2, non-neuromuscular disease N=2) underwent immunohistochemistry for hnRNPA1, hnRNPA2B1, and TDP-43. Muscle transcriptional microarray data from 27 patients with sIBM and 12 patients without neuromuscular disease was analyzed. Depletion of hnRNPA1 and hnRNPA2B1 was present in 15% and 7% of sIBM myonuclei, respectively, compared with 1% and 0% of myonuclei in non-sIBM muscle. Sarcoplasmic aggregates of hnRNPA1 and hnRNPA2B1 distinct from TDP-43 aggregates were also found in sIBM. hnRNPA1 and hnRNPA2B1, as well as other hnRNPs, gene expression was unaltered in sIBM compared to normal muscle. Along with TDP-43, other hnRNPs, including hnRNPA1 and hnRNPA2B1, are depleted from sIBM myonuclei at the protein but not transcript level. The depletion of multiple hnRNPs from sIBM myonuclei together with their sarcoplasmic aggregation suggests that one aspect of sIBM pathophysiology may involve abnormal RNA metabolism that includes hyperassembly of ribonucleoprotein granules mediated by prion-like domains in hnRNPs, evolving into pathological aggregates.

材料
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产品描述

Sigma-Aldrich
Monoclonal Anti-TARDBP antibody produced in mouse, clone 2E2-D3, purified immunoglobulin, buffered aqueous solution
Sigma-Aldrich
Anti-hnRNP-A1 antibody, Mouse monoclonal, clone 9H10, purified from hybridoma cell culture
Sigma-Aldrich
Anti-TARDBP (ab1) antibody produced in rabbit, affinity isolated antibody
Sigma-Aldrich
Anti-TDP-43 antibody produced in rabbit, ~1.5 mg/mL, affinity isolated antibody, buffered aqueous solution
Sigma-Aldrich
Anti-TARDBP antibody produced in rabbit, affinity isolated antibody, buffered aqueous glycerol solution

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