Timosaponin AIII induces autophagy of Tcell acute lymphoblastic leukemia Jurkat cells via inhibition of the PI3K/Akt/mTOR pathway.
Oncol Rep
; 41(5): 2937-2944, 2019 May.
Article
em En
| MEDLINE
| ID: mdl-30896824
ABSTRACT
Timosaponin AIII (TAIII) is a saponin isolated from anemarrhena asphodeloides and possesses the inhibitory effect on proliferation of multiple tumor cells. In the present study, the antitumor effect of TAIII and its underlying molecular mechanisms were investigated in vitro in Tcell acute lymphoblastic leukemia (TALL) Jurkat cells. The results demonstrated that TAIII inhibits the viability of Jurkat cells in a time and dosedependent manner, and induces apoptosis of Jurkat cells in a dosedependent manner. Transmission electron microscopy demonstrated the formation of numerous autophagosomes in TAIIItreated Jurkat cells. Furthermore, monodansylcadaverine (MDC)labeled autophagic vacuoles were observed following TAIII treatment by an inverted fluorescence microscope and MDC accumulation increased notably in TAIII treatment groups in a concentrationdependent manner. Bcell lymphoma2 (Bcl2)associated X (Bax) was upregulated while Bcl2 was reduced following TAIII treatment, indicating that the proapoptotic mechanism of TAIII may be associated with upregulation of Bax. Further investigation revealed that TAIII promotes the expression of autophagyassociated proteins Beclin 1 and LC3II, and inhibits the phosphoinositide 3kinase/Akt/mechanistic target of rapamycin kinase pathway. The present study revealed that the antitumor activity of TAIII was primarily achieved by the induction of cell apoptosis and autophagy, indicating a promising potential as a novel effective reagent against TALL.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Saponinas
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Autofagia
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Esteroides
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Transdução de Sinais
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Leucemia-Linfoma Linfoblástico de Células T Precursoras
Limite:
Humans
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article