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Targeting of multiple senescence-promoting genes and signaling pathways by triptonide induces complete senescence of acute myeloid leukemia cells.

Abstract：

:Leukemia cells aberrantly overexpress senescence-suppression telomerase reverse transcriptase (TERT) and down-regulate key senescence-promoting genes to escape complete senescence, resulting in immortalization and malignant progression. Accordingly, induction of complete senescence is a sensible strategy for anti-leukemia therapy. However, effective senescence-based anti-leukemia drugs with low toxicity are currently lacking. In this study, we found that triptonide (chemical name diterpene triepoxide), a small molecule derived from the herb Tripterygium wilfordii Hook, strongly induced complete senescence in cultured acute myeloid leukemia (AML) cell lines, and potently inhibited growth and colony formation of U937 and HL-60 AML cell line with IC50 values of 7.5 and 12nM, respectively. Strikingly, triptonide (4mg/kg) nearly completely suppressed human leukemia cell tumorigenicity (>99%) without obvious toxicity in a mouse xenograft model. Mechanistic studies showed that triptonide induced senescence followed by apoptosis mainly by suppressing transcription of TERT and oncogenic c-Myc, while concomitantly promoting transcription of senescence-promoting genes p16 and p21 and the pro-apoptotic gene encoding DNA damage-inducible transcript 3. These effects of triptonide are mediated by selective mitogen-activated protein kinase kinase-3/p38 signaling pathway activation. Our study provides a conceptual framework for inducing complete senescence as an effective anti-leukemia therapeutic strategy through a "multiple-hits" model and supports further development of triptonide as an anti-cancer agent.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Pan Y,Meng M,Zheng N,Cao Z,Yang P,Xi X,Zhou Q

doi

10.1016/j.bcp.2016.11.024

subject

Has Abstract

pub_date

2017-02-15 00:00:00

pages

34-50

eissn

0006-2952

issn

1873-2968

pii

S0006-2952(16)30446-4

journal_volume

126

pub_type

杂志文章

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