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First published online 10 June 2008
doi: 10.1242/jcs.021782

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Differential growth factor regulation of N-cadherin expression and motility in normal and malignant oral epithelium

Michelle E. Diamond^1,*, Limin Sun^1,2,*, Adam J. Ottaviano¹, Mathew J. Joseph¹ and Hidayatullah G. Munshi^1,2,3,

¹ Division of Hematology/Oncology, Department of Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
² The Jesse Brown VA Medical Center, Chicago, IL 60611, USA
³ The Robert H. Lurie Comprehensive Cancer Center of Northwestern University, Chicago, IL 60611, USA

Author for correspondence (e-mail: h-munshi{at}northwestern.edu)

Accepted 19 April 2008

Aberrant expression of N-cadherin is associated with tumor progression in squamous cell carcinomas (SCCs). Consequently, we examined the regulation of N-cadherin by TGFβ1, an important mediator of keratinocyte and SCC function. N-cadherin expression was increased in oral SCC (OSCC) cell lines, regulating motility and correlating with TGFβ1 production. Moreover, in normal keratinocytes TGFβ1 increased expression of N-cadherin to regulate motility. TGFβ1-mediated N-cadherin expression in the oral keratinocytes was blocked using siRNA targeting Smads. Unexpectedly, we found that EGF blocked TGFβ1-mediated N-cadherin expression in oral keratinocytes and not in OSCC cells. Mechanistically, EGF enhanced Smad phosphorylation in the linker region, and attenuated TGFβ1-mediated phosphorylation of Smad at the C-terminus, localization of Smad to the nucleus as well as Smad-driven promoter activity exclusively in oral keratinocytes but not in OSCC cells. The effect of EGF on TGFβ1-mediated Smad-driven promoter activity and N-cadherin expression was reversed when activation of ERK1/2 was blocked. Although EGF and TGFβ1 independently promoted migration of both oral keratinocytes and OSCC cells, EGF decreased TGFβ1-mediated migration of oral keratinocytes but enhanced migration of OSCC cells. Together, these data support a model wherein EGF signaling has an important negative regulatory role on TGFβ1-mediated N-cadherin expression and motility in normal oral keratinocytes, and in which loss of this regulatory mechanism accompanies malignant transformation of the oral epithelium.

Key words: Motility, N-cadherin, TGFβ1, EGF, Smad, ERK1/2, Oral cancer