PMID- 27685907 OWN - NLM STAT- MEDLINE DCOM- 20170303 LR - 20181202 IS - 1107-0625 (Print) IS - 1107-0625 (Linking) VI - 21 IP - 4 DP - 2016 Jul-Aug TI - Cbl-b regulates the sensitivity of cetuximab through ubiquitin-proteasome system in human gastric cancer cells. PG - 867-873 AB - PURPOSE: Cetuximab is a monoclonal antibody against epidermal growth factor receptor (EGFR) and is approved for clinical use in combination with chemotherapy in patients affected by colorectal cancer (CRC), non small cell lung cancer (NSCLC), and head and neck cancer. Compared with these cancers, gastric cancer is relatively resistant to cetuximab and its regulatory mechanism is still unclear. METHODS: In this study, we assessed whether the ubiquitin- proteasome pathway is involved in regulating cetuximab-induced cells apoptosis in MGC803 and BGC823 gastric cancer cell lines. RESULTS: The casitas B lineage lymphoma-b (Cbl-b), a kind of E3 ubiquitin ligase, was involved in this process. Specific silenced Cbl-b expression increased the expression of EGFR. CONCLUSIONS: Our findings lead to a better understanding of the mechanism of cetuximab action, and suggests that Cbl-b increases the sensitivity of cetuximab in gastric cancer cells. FAU - Yu, Ping AU - Yu P AD - Department of Medical Oncology, The First Hospital of China Medical University, Shenyang, China. FAU - Fan, Yibo AU - Fan Y FAU - Qu, Xiujuan AU - Qu X FAU - Zhang, Jingdong AU - Zhang J FAU - Song, Na AU - Song N FAU - Liu, Jing AU - Liu J FAU - Liu, Yunpeng AU - Liu Y LA - eng PT - Journal Article PL - Cyprus TA - J BUON JT - Journal of B.U.ON. : official journal of the Balkan Union of Oncology JID - 100883428 RN - 0 (Adaptor Proteins, Signal Transducing) RN - 0 (Antibodies, Monoclonal) RN - 0 (Antineoplastic Agents) RN - 0 (Ubiquitin) RN - EC 2.3.2.27 (CBLB protein, human) RN - EC 2.3.2.27 (Proto-Oncogene Proteins c-cbl) RN - EC 2.7.10.1 (EGFR protein, human) RN - EC 2.7.10.1 (ErbB Receptors) RN - EC 3.4.25.1 (Proteasome Endopeptidase Complex) RN - PQX0D8J21J (Cetuximab) SB - IM MH - Adaptor Proteins, Signal Transducing/*metabolism MH - Antibodies, Monoclonal/pharmacology MH - Antineoplastic Agents/pharmacology MH - Apoptosis/drug effects MH - Cell Line, Tumor MH - Cetuximab/*pharmacology MH - Drug Resistance, Neoplasm/physiology MH - ErbB Receptors/metabolism MH - Humans MH - Proteasome Endopeptidase Complex/*metabolism MH - Proto-Oncogene Proteins c-cbl/*metabolism MH - Stomach Neoplasms/*drug therapy/*metabolism MH - Ubiquitin/*metabolism EDAT- 2016/09/30 06:00 MHDA- 2017/03/04 06:00 CRDT- 2016/09/30 06:00 PHST- 2016/09/30 06:00 [entrez] PHST- 2016/09/30 06:00 [pubmed] PHST- 2017/03/04 06:00 [medline] PST - ppublish SO - J BUON. 2016 Jul-Aug;21(4):867-873.