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- Title
MyD88 is involved in the signalling pathway for Taxol-induced apoptosis and TNF-α expression in human myelomonocytic cells.
- Authors
Wang, Jingxin; Kobayashi, Masanobu; Han, Mingzhe; Choi, Sungki; Takano, Masatoshi; Hashino, Satoshi; Tanaka, Junji; Kondoh, Takeshi; Kawamura, Ken-ichi; Hosokawa, Masuo
- Abstract
Summary. Taxol is an effective anti-tumour drug against a variety of tumour cells. Taxol directly induces apoptosis in addition to a G2/M cell cycle arrest. However, it remains poorly understood how Taxol induces apoptosis in tumour cells. Taxol induces the secretion of inflammatory cytokines in murine macrophages in a toll-like receptor-4 (TLR-4)-dependent manner in addition to its anti-tumour effects, but the effect of Taxol on human macrophages is controversial. In this study, we demonstrated that low doses (less than 1000 nmol/l) of Taxol induced the expression of tumour necrosis factor (TNF)-α in human myelomonocytic cells and that the induction of TNF-α mRNA was inhibited by dominant-negative myeloid differentiation protein (dnMyD88). Furthermore, we demonstrated that the same doses of Taxol induced apoptosis of the same myelomonocytic cells and that the Taxol-induced apoptosis was also inhibited by dnMyD88. In accordance with the previous reports, Taxol induced the expression of TNF-α and apoptosis in a TLR4-independent manner. These results suggest that TNF-α expression and apoptosis, both induced by Taxol in human myelomonocytic cells, share the signal transduction molecule MyD88.
- Subjects
APOPTOSIS; PACLITAXEL; TUMOR necrosis factors
- Publication
British Journal of Haematology, 2002, Vol 118, Issue 2, p638
- ISSN
0007-1048
- Publication type
Article
- DOI
10.1046/j.1365-2141.2002.03645.x