Cited by 38Autophagy in Disease and TherapyNatural product bioactivities and synthesisNatural Compounds in Disease Treatment

Tubeimoside-1, a triterpenoid saponin, induces cytoprotective autophagy in human breast cancer cells in vitro via Akt-mediated pathway

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Jiang, Shi-long, Guan, Yi-di, Chen, Xi-sha, Ge, Peng, Wang, Xin-luan, Lao, Yuan-zhi, Xiao, Song-shu, Zhang, Yi +4 more·2019·Acta Pharmacologica Sinica

Abstract

Autophagy, a form of cellular self-digestion by lysosome, is associated with various disease processes including cancers, and modulating autophagy has shown promise in the treatment of various malignancies. A number of natural products display strong antitumor activity, yet their mechanisms of action remain unclear. To gain a better understanding of how traditional Chinese medicine agents exert antitumor effects, we screened 480 natural compounds for their effects on autophagy using a high content screening assay detecting GFP-LC3 puncta in HeLa cells. Tubeimoside-1 (TBMS1), a triterpenoid saponin extracted from Bolbostemma paniculatum (Maxim) Franquet (Cucurbitaceae), was identified as a potent activator of autophagy. The activation of autophagy by TBMS1 was evidenced by increased LC3-II amount and GFP-LC3 dots, observation of autophagosomes under electron microscopy, and enhanced autophagic flux. To explore the mechanisms underlying TBMS1-activated autophagy, we performed cheminformatic analyses and surface plasmon resonance (SPR) binding assay that showed a higher likelihood of the binding between Akt protein and TBMS1. In three human breast cancer cell lines, we demonstrated that Akt-mTOR-eEF-2K pathway was involved in TBMS1-induced activation of autophagy, while Akt-mediated downregulations of Mcl-1, Bcl-xl, and Bcl-2 led to the activation of apoptosis of the breast cancer cells. Inhibition of autophagy enhanced the cytotoxic effect of TBMS1 via promoting apoptosis. Our results demonstrate the role and mechanism of TBMS1 in activating autophagy, suggesting that inhibition of cytoprotective autophagy may act as a therapeutic strategy to reinforce the activity of TBMS1 against cancers.

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Authors
Jiang, S.-L., Guan, Y.-D., Chen, X.-S., Ge, P., Wang, X.-L., Lao, Y.-Z., Xiao, S.-S., Zhang, Y., Yang, J.-M., Xu, X.-J., Cao, D.-S., & Cheng, Y.
Affiliations
  • Central South University (CN)
  • Soochow University (CN)
Corresponding author
Cheng, Yan
Venue
Acta Pharmacologica Sinica
Published
2018-10-12
Volume
40
Issue
7
Pages
919-928
ISSN
  • 0253-9756 (ISSN-L)
  • 1671-4083
  • 1745-7254
OpenAlex
W2896935164
Cited by
37
References
52
Citations by year
2026: 3 · 2025: 8 · 2024: 5 · 2023: 2 · 2022: 2 · 2021: 6 · 2020: 7 · 2019: 3 · 2018: 1
FWCI
3.32
Type
journal article
Language
en
Open access
Locations
  • Acta Pharmacologica Sinica (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Natural Science Foundation of China (81472593, 81422051)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Natural product bioactivities and synthesis
  • Health Sciences › Medicine › Complementary and alternative medicine › Natural Compounds in Disease Treatment
Keywords
triterpenoid saponins, autophagy, cytoprotective autophagy, breast cancer, Akt signaling, mTOR, eEF2K, apoptosis, Bcl-2 family proteins, Mcl-1, Bcl-xL, LC3, autophagic flux, Bolbostemma paniculatum, traditional Chinese medicine, anticancer natural products
MeSH terms
Antineoplastic Agents, Autophagy, Breast Neoplasms, Humans, Saponins, Triterpenes, Signal Transduction, Apoptosis, Cell Line, Tumor, Proto-Oncogene Proteins c-akt

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