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Published 29 October 2001. doi:10.1083/jcb.200103078
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© The Rockefeller University Press, 0021-9525/2001/10/415 $5.00
The Journal of Cell Biology, Volume 155, Number 3, October 29, 2001 415-426


Article

Keratin attenuates tumor necrosis factor–induced cytotoxicity through association with TRADD



Hiroyasu Inada1, Ichiro Izawa1, Miwako Nishizawa1, Eriko Fujita4, Tohru Kiyono2, Toshitada Takahashi3, Takashi Momoi4 and Masaki Inagaki1

1 Division of Biochemistry, Aichi Cancer Center Research Institute, Aichi 464-8681, Japan
2 Division of Virology, Aichi Cancer Center Research Institute, Aichi 464-8681, Japan
3 Division of Immunology, Aichi Cancer Center Research Institute, Aichi 464-8681, Japan
4 Division of Development and Differentiation, National Institute of Neuroscience, NCNP, Tokyo 187-8502, Japan

Address correspondence to Dr. Masaki Inagaki, Division of Biochemistry, Aichi Cancer Center Research Institute, 1-1 Kanokoden, Chikusaku, Nagoya, Aichi 464-8681, Japan. Tel.: 81-52-762-6111 (ext. 7020). Fax: 81-52-763-5233. E-mail: minagaki{at}aichi-cc.jp

Keratin 8 and 18 (K8/18) are the major components of intermediate filament (IF) proteins of simple or single-layered epithelia. Recent data show that normal and malignant epithelial cells deficient in K8/18 are nearly 100 times more sensitive to tumor necrosis factor (TNF)–induced cell death. We have now identified human TNF receptor type 1 (TNFR1)–associated death domain protein (TRADD) to be the K18-interacting protein. Among IF proteins tested in two-hybrid systems, TRADD specifically bound K18 and K14, type I (acidic) keratins. The COOH-terminal region of TRADD interacted with the coil Ia of the rod domain of K18. Endogenous TRADD coimmunoprecipitated with K18, and colocalized with K8/18 filaments in human mammary epithelial cells. Overexpression of the NH2 terminus (amino acids 1–270) of K18 containing the TRADD-binding domain as well as overexpression of K8/18 in SW13 cells, which are devoid of keratins, rendered the cells more resistant to killing by TNF. We also showed that overexpressed NH2 termini of K18 and K8/18 were associated with endogenous TRADD in SW13 cells, resulting in the inhibition of caspase-8 activation. These results indicate that K18 may sequester TRADD to attenuate interactions between TRADD and activated TNFR1 and moderate TNF-induced apoptosis in simple epithelial cells.

Key Words: apoptosis; keratin 8; keratin 18; TNF; TRADD


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