Cylindromatosis (CYLD) is a deubiquitinating enzyme that is altered in patients with familial cylindromatosis, a condition characterized by numerous benign adnexal tumors. However, the regulatory function of CYLD remains unsettled. Here we show that the development of B cells, T cells, and myeloid cells was unaffected in CYLD-deficient mice, but that the activation of these cells with mediators of innate and adaptive immunity resulted in enhanced NF-κB and JNK activity associated with increased TNF receptor–associated factor 2 (TRAF2) and NF-κB essential modulator (NEMO) ubiquitination. CYLD-deficient mice were more susceptible to induced colonic inflammation and showed a dramatic increase in the incidence of tumors compared with controls in a colitis-associated cancer model. These results suggest that CYLD limits inflammation and tumorigenesis by regulating ubiquitination in vivo.
Jun Zhang, Brigid Stirling, Stephane T. Temmerman, Chi A. Ma, Ivan J. Fuss, Jonathan M.J. Derry, Ashish Jain
Histopathologic scoring of colons in