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Abstract Title:

Green tea polyphenol epigallocatechin-O-gallate induces cell death by acid sphingomyelinase activation in chronic myeloid leukemia cells.

Abstract Source:

Oncol Rep. 2015 Jun 26. Epub 2015 Jun 26. PMID: 26135316

Abstract Author(s):

Yuhui Huang, Motofumi Kumazoe, Jaehoon Bae, Shuhei Yamada, Mika Takai, Shiori Hidaka, Shuya Yamashita, Yoonhee Kim, Yeongseon Won, Motoki Murata, Shuntaro Tsukamoto, Hirofumi Tachibana

Article Affiliation:

Yuhui Huang

Abstract:

An epidemiological study showed that green tea consumption is associated with a reduced risk of hematopoietic malignancy. The major green tea polyphenol epigallocatechin‑3-O-gallate (EGCG) is reported to have anticancer effects. Chronic myeloid leukemia (CML) is a major hematopoietic malignancy characterized by expansion of myeloid cells. In the present study, we showed EGCG-induced acid sphingomyelinase (ASM) activation and lipid raft clustering in CML cells. The ASM inhibitor desipramine significantly reduced EGCG-induced cell death. Protein kinase Cδ is a well‑known kinase that plays an important role in ASM activation. We observed EGCG-induced phosphorylation of protein kinase Cδ at Ser664. Importantly, EGCG-induced ASM activation was significantly reduced by pretreatment of CML cells with the soluble guanylate cyclase inhibitor NS2028, suggesting that EGCG induced ASM activation through the cyclic guanosine monophosphate (cGMP)-dependent pathway. Indeed, pharmacological inhibition of a cGMP-negative regulator enhanced the anti-CML effect ofEGCG. These results indicate that EGCG-induced cell death via the cGMP/ASM pathway in CML cells.

Study Type : In Vitro Study

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