Role of Myeloid Cell Leukemia-1 in Cell Growth of Squamous Cell Carcinoma

DOI Web Site 3 Citations 52 References
  • Nagata Masahide
    Department of Pharmacology, Graduate School of Dentistry, Osaka University, Japan The First Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, Japan
  • Wada Koichiro
    Department of Pharmacology, Graduate School of Dentistry, Osaka University, Japan
  • Nakajima Atsushi
    Division of Gastroenterology, Yokohama City University School of Medicine, Japan
  • Nakajima Noriko
    Department of Pathology, National Institute of Infectious Diseases, Japan
  • Kusayama Morio
    Department of Pharmacology, Graduate School of Dentistry, Osaka University, Japan The First Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, Japan
  • Masuda Tomotake
    The First Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, Japan
  • Iida Seiji
    The First Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, Japan
  • Okura Masaya
    The First Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, Japan
  • Kogo Mikihiko
    The First Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Osaka University, Japan
  • Kamisaki Yoshinori
    Department of Pharmacology, Graduate School of Dentistry, Osaka University, Japan

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Abstract

Myeloid cell leukemia-1 (Mcl-1), a member of the B-cell lymphoma-2 (Bcl-2) family, has been reported to be a critical survival factor in hematopoietic cells, yet little data exists for a role of Mcl-1 in human oral squamous cell carcinoma (SCC). A high level expression of Mcl-1 was observed in tumor cells of human primary SCC, lymph node metastasis tissues, and SCC cell lines. We manipulated expression of Mcl-1 protein in SCC cells by small interfering RNA (siRNA) for Mcl-1 and observed that Mcl-1 siRNA inhibited the growth of SCCs accompanied with apoptosis. Combination therapy of Mcl-1 siRNA and anti-tumor drug drastically inhibited the cell growth in comparison to that in each single treatment. In addition, phosphorylation of focal adhesion kinase (FAK) was decreased by treatment with Mcl-1 siRNA, resulting in decreases in phosphorylation of MEK1/2 and MAPK. The cell growth inhibition caused by knockdown of Mcl-1 was suggested to be mainly a result of suppression of proliferation via the inhibition of intracellular FAK/MAPK signaling pathways. These results imply a potentially important and novel role of the inhibition of Mcl-1 function by the use of specific siRNA in the treatment of SCC.<br>

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