Overexpression of Rac-1 small GTPase binding protein in oral squamous cell carcinoma

Shyun Y. Liu, Ching Y. Yen, Shun Chun Yang, Wei F. Chiang, Kuo W. Chang

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Purpose: Oral squamous cell carcinoma (OSCC) is a fairly common malignancy in Taiwan and most countries of South Asia due to the popularity of areca quid use. In vitro studies have indicated that Rac proteins, a member of ras-related small GTPase protein family, can regulate cytoskeletal structures and activate signaling cascade and have the potential to transform cultured cells. However, Rac alteration during oral carcinogenesis in vivo has yet to be shown. The present study was conducted to investigate the importance of Rac-1 in oral tumorigenesis in vivo. Patients and Methods: Expression level of Rac-1 protein and mRNA in OSCC together with noncancerous match tissue (NCMT) was explored using immunohistochemistry and reverse transcription-polymerase chain reaction analysis. Results: The immunoreactivity of Rac-1 was shown in a significantly higher fraction of OSCC (74%) relative to the 48% in NCMT (P = .03). Eight of 14 (57%) available tissue pairs also showed overexpression of Rac-1 mRNA in OSCC than that in NCMT. The Rac-1 immunoreactivity did not differ significantly in accord with clinicopathologic parameters including areca quid use. However, 3 of 4 recurrent OSCC studied lacked the Rac-1 immunoreactivity. Conclusions: Our results presented novel findings: Rac-1 overexpression is a frequent occurrence in OSCC, highlighting the involvement of GTPase elements in the neoplastic growth of OSCC.

Original languageEnglish
Pages (from-to)702-707
Number of pages6
JournalJournal of Oral and Maxillofacial Surgery
Volume62
Issue number6
DOIs
Publication statusPublished - Jun 2004
Externally publishedYes

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Monomeric GTP-Binding Proteins
Squamous Cell Carcinoma
Carrier Proteins
rac GTP-Binding Proteins
Areca
Carcinogenesis
Messenger RNA
GTP Phosphohydrolases
Taiwan
Reverse Transcription
Cultured Cells
Immunohistochemistry
Polymerase Chain Reaction
Growth
Neoplasms

ASJC Scopus subject areas

  • Surgery
  • Dentistry(all)

Cite this

Overexpression of Rac-1 small GTPase binding protein in oral squamous cell carcinoma. / Liu, Shyun Y.; Yen, Ching Y.; Yang, Shun Chun; Chiang, Wei F.; Chang, Kuo W.

In: Journal of Oral and Maxillofacial Surgery, Vol. 62, No. 6, 06.2004, p. 702-707.

Research output: Contribution to journalArticle

Liu, Shyun Y. ; Yen, Ching Y. ; Yang, Shun Chun ; Chiang, Wei F. ; Chang, Kuo W. / Overexpression of Rac-1 small GTPase binding protein in oral squamous cell carcinoma. In: Journal of Oral and Maxillofacial Surgery. 2004 ; Vol. 62, No. 6. pp. 702-707.
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