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Article Publish Status: FREE
Abstract Title:

Saikosaponin D suppresses enterovirus A71 infection by inhibiting autophagy.

Abstract Source:

Signal Transduct Target Ther. 2019;4:4. Epub 2019 Feb 22. PMID: 30820356

Abstract Author(s):

Chang Li, Lihong Huang, Wei Sun, Ying Chen, Ming-Liang He, Jianbo Yue, Heather Ballard

Article Affiliation:

Chang Li

Abstract:

The dysregulation of autophagy, an evolutionarily conserved lysosomal degradation process, has been implicated in a wide variety of human diseases, and thus, small chemicals that modulate autophagy have therapeutic potential. Here, we assessed the ability of active components isolated from, a popular Chinese herb, to modulate autophagy. We found that saikosaponin D (SsD) and A (SsA) but not C (SsC) potently and reversibly inhibited the fusion of autophagosomes and lysosomes, resulting in the accumulation of autophagosomes, an increased lysosomal pH, and TFEB nuclear translocation. RAB5A knockdown or the expression of a dominant-negative RAB5 mutant significantly reduced the ability of SsD or SsA to block autophagy. Enterovirus A71 (EV-A71), the cause of hand-foot-mouth disease, has been shown to induce autophagy. We found that SsD potently inhibited EV-A71 RNA replication and subsequent viral protein synthesis, thereby preventing EV-A71-induced cell death. ATG5 knockdown inhibited EV-A71 viral protein synthesis, whereas autophagy induction by rapamycin promoted synthesis. Taken together, our data indicate that SsD and SsA are potent late-stage autophagy inhibitors that can be used to prevent EV-A71 infection.

Study Type : In Vitro Study

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