Botulinum neurotoxin (BoNT) is an etiologic agent of food poisoning caused by Clostridium botulinum. The large progenitor toxin complex (L-PTC) crosses the intestinal epithelial barrier to deliver BoNT to target neurons; however, it is not clearly understood how BoNT enters the host. Here, we identified low-density lipoprotein receptor-related protein 1 (LRP1) as a major enterocyte transcytosis receptor for the hyper-oral-toxic L-PTC serotype B-Okra (L-PTC/BOkra). We found that hemagglutinin (HA), a neurotoxin-associated protein within the L-PTC/BOkra complex, binds to LRP1 via N-glycans. HA/BOkra co-localized with LRP1 within the internalized vesicles in cultured cells and enterocytes. LRP1 deletion inhibited the apical-to-basal transcytosis of L-PTC/BOkra in an intestinal epithelial cell line, and this effect was rescued by LRP1 re-expression. Finally, intestinal epithelial cell-specific LRP1-deficient mice displayed reduced susceptibility to toxicity caused by oral administration of L-PTC/BOkra. Taken together, these results indicate that N-glycosylated LRP1 mediates L-PTC/BOkra transcytosis via enterocytes, enabling BoNT to traverse the intestinal epithelial barrier.
Amatsu, S., Matsumura, T., Morimoto, C., Yagita, H., Ishii, K.-a., Kanaya, T., Hase, K., Kobayashi, N., Zuka, M., Ohno, H., Takamura, T., Fujinaga, Y.
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