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Regulation of endo-lysosomal pathway and autophagic flux by broad-spectrum antipathogen inhibitor ABMA.

The FEBS journal (2020-01-05)
Yu Wu, Claire Boulogne, Stefan Carle, Maria Podinovskaia, Holger Barth, Anne Spang, Jean-Christophe Cintrat, Daniel Gillet, Julien Barbier
ABSTRACT

The endo-lysosome system is involved in endocytosis, protein sorting, and degradation as well as autophagy. Numerous toxins and pathogens exploit this system to enter host cells and exert their deleterious effects. Modulation of host endo-lysosome pathway may restrict multiple toxins intoxication as well as pathogen infection. ABMA, selected from a high-throughput screening against the cytotoxicity of ricin toxin, exhibits a broad-spectrum antitoxin and antipathogen activity. Here, we show that ABMA selectively retains endocytosed protein and toxin to late endosomes and thus delaying their intracellular trafficking. It also impairs the autophagic flux by excessive fusion of late endosomes and autophagosomes. Its exclusive action on late endosomes and corresponding consequences on the endo-lysosomal pathway and autophagic flux are distinct from known inhibitors such as bafilomycin A1, EGA, or chloroquine. Hence, besides being a broad-spectrum inhibitor of endocytosed toxins and pathogens, ABMA may serve as a molecular tool to dissect endo-lysosome system-related cellular physiology and mechanisms of pathogenesis.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Gelatin from cold water fish skin, 40-50% in H2O
Sigma-Aldrich
Diphtheria Toxin from Corynebacterium diphtheriae, lyophilized powder, Product is in unnicked form
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Filipin III from Streptomyces filipinensis, ≥85% (HPLC)
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Anti-LC3B antibody produced in rabbit, ~1 mg/mL, affinity isolated antibody, buffered aqueous solution
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SMER28, >99% (HPLC), solid
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Anti-p62/SQSTM1 antibody produced in rabbit, ~1 mg/mL, affinity isolated antibody, buffered aqueous solution
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G 418 disulfate salt solution, 50 mg/mL in H2O, 0.1 μm filtered, BioReagent, suitable for cell culture
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EGA, ≥98% (HPLC)
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Anti-LAMP1 antibody produced in rabbit, affinity isolated antibody, buffered aqueous solution
Sigma-Aldrich
Dimethyl sulfoxide, ≥99.5% (GC), suitable for plant cell culture
Sigma-Aldrich
Bafilomycin A1 from Streptomyces griseus, ≥90% (HPLC)
Sigma-Aldrich
bisBenzimide H 33342 trihydrochloride, for fluorescence, ≥97.0% (HPLC)