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Glioblastoma cell death induced by asiatic acid

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Abstract

Asiatic acid (AA), a triterpene, is known to be cytotoxic to several tumor cell lines. AA induces dose- and time-dependent cell death in U-87 MG human glioblastoma. This cell death occurs via both apoptosis and necrosis. The effect of AA may be cell type-specific as AA-induced cell death was mainly apoptotic in colon cancer RKO cells. AA-induced glioblastoma cell death is associated with decreased mitochondrial membrane potential, activation of caspase-9 and -3, and increased intracellular free Ca2+. Although treatment of glioblastoma cells with the caspase inhibitor zVAD-fmk completely abolished AA-induced caspase activation, it did not significantly block AA-induced cell death. AA-induced cell death was significantly prevented by an intracellular Ca2+ inhibitor, BAPTA/AM. Taken together, these results indicate that AA induces cell death by both apoptosis and necrosis, with Ca2+-mediated necrotic cell death predominating.

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Abbreviations

Δψm :

mitochondrial transmembrane potential

AA:

asiatic acid

AMC:

7-amino-4-methylcoumarin

DEVD-AMC:

N-acetyl-Asp-Glu-Val-Asp-7-amino-4-methylcoumarin

DiOC6(3):

3,3′-dihexyloxacarbocyanide iodide

LDH:

lactate dehydrogenase

LEHD-AMC:

N-acetyl-Leu-Glu-His-Asp-AMC

PARP:

poly(ADP-ribose)-polymerase

PCD:

programmed cell death

PS:

phosphatidylserine

S-LLVY-AMC:

succinyl-Leu-Leu-Val-Tyr-AMC

STS:

staurosporine

zVAD-fmk:

benzyloxycarbonyl-Val-Ala-Asp-fluoromethylketone

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Correspondence to C. Rha.

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Cho, C.W., Choi, D.S., Cardone, M.H. et al. Glioblastoma cell death induced by asiatic acid. Cell Biol Toxicol 22, 393–408 (2006). https://doi.org/10.1007/s10565-006-0104-2

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  • DOI: https://doi.org/10.1007/s10565-006-0104-2

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