Cellular Oncology

, Volume 36, Issue 3, pp 233–245 | Cite as

Tumor protein D54 is a negative regulator of extracellular matrix-dependent migration and attachment in oral squamous cell carcinoma-derived cell lines

  • Yoshiki MukudaiEmail author
  • Seiji Kondo
  • Atsushi Fujita
  • Yasuto Yoshihama
  • Tatsuo Shirota
  • Satoru Shintani
Original Paper



Tumor protein D54 (TPD54) belongs to the TPD52 family of proteins and is expressed in several types of cancer, including oral squamous cell carcinoma (OSCC). Here, we investigated relationships between various OSCC-related characteristics and TPD54 expression in vitro.


The expression of TPD54 in several OSCC-derived cell lines and normal, non-malignant, cells was assessed. Based on the results obtained, OSCC-derived SAS cells were subsequently subjected to exogenous over-expression of alternative splice variants (ASVs) of TPD54 and to TPD54 knock-down, mediated by siRNA. Next, the role of TPD54 in cellular growth, apoptosis, invasion, migration and extracellular-matrix (ECM)-dependent migration and attachment was investigated, as also the concomitant expression of integrins and integrin-related proteins by the OSCC-derived cells.


Western blot analysis and RT-PCR revealed that several TPD54 ASVs were expressed in the OSCC-derived cell lines tested. Neither exogenous ASV over-expression nor TPD54 knock-down modulated the proliferation or invasion of SAS cells in a monolayer culture assay. However, exogenous ASV over-expression did decrease anchorage-independent growth and TPD54 knock-down did increase anchorage-independent growth, irrespective of caspase activities. The same effects were observed on ECM-dependent cellular migration and cell attachment to the ECM. The expression levels of the major α and β integrin subunits, and of E-cadherin, were found to be similar to those observed in the non-transfected control cells, whereas talin1 expression was found to be increased after TPD54 knock-down. Also Akt was found to be activated after TPD54 knock-down, even in the absence of serum stimulation. Very similar effects were observed in the OSCC-derived cell lines HSC 2 and HSC 3.


Our results show that TPD54 affects OSCC cell attachment to the ECM, OSCC cell migration, and Akt/PKB activation by modulating integrin activation via a talin1-mediated inside-out signal of the ECM. Based on these results, we suggest that TPD54 may serve as a novel biomarker for OSCC and as a putative target for OSCC therapy.


TPD54 TPD52 family Oral cancer Integrin Talin Akt ECM 



This study was supported by Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (to Y.M., S.K., T.S. and S.S.), and by the High-Technology Research Center Project from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (to S.S.). The authors wish to thank Drs. Hiroaki Kamatani, Yasumasa Yoshizawa, Tomohiko Kutsuna Sayaka Yoshiba, Arisa Yasuda, Ryota Kishigami and Yuji and Sayaka Kurihara for their helpful suggestions, and to Ms. Miho Yoshihara for secretarial assistance.

Ethical standards

The experiments complied with the current laws of Japan.

Conflict of interest statement

The authors declare that they have no conflicts of interest.


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Copyright information

© International Society for Cellular Oncology 2013

Authors and Affiliations

  • Yoshiki Mukudai
    • 1
    Email author
  • Seiji Kondo
    • 1
  • Atsushi Fujita
    • 1
  • Yasuto Yoshihama
    • 1
  • Tatsuo Shirota
    • 1
  • Satoru Shintani
    • 1
  1. 1.Department of Oral and Maxillofacial Surgery, School of DentistryShowa UniversityTokyoJapan

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