Interleukin-1alpha Enhances the Aggressive Behavior of Pancreatic Cancer Cells by Regulating the Alpha6beta1-integrin and Urokinase Plasminogen Activator Receptor Expression

Overview

Journal BMC Cell Biol

Publisher Biomed Central

Specialty Cell Biology

Date 2006 Mar 1

PMID 16504015

Citations 20

Authors

Hirozumi Sawai

Yuji Okada

Hitoshi Funahashi

Yoichi Matsuo

Hiroki Takahashi

Hiromitsu Takeyama

Tadao Manabe

Affiliations

Soon will be listed here.

Abstract

Background: In human pancreatic cancer progression, the alpha6beta1-integrin is expressed on cancer cell surface during invasion and metastasis formation. In this study, we investigated whether interleukin (IL)-1alpha induces the alterations of integrin subunits and urokinase plasminogen activator/urokinase plasminogen activator receptor (uPA/uPAR) expression in pancreatic cancer cells. We hypothesize that the alterations of integrin subunits and uPA/uPAR expression make an important role in signaling pathways responsible for biological behavior of pancreatic cancer cells.

Results: IL-1alpha upregulated the expression of alpha6 and beta1 integrins without any alterations of alpha5 and alphav integrins expression. IL-1alpha also induced enhancement in the expression of uPA/uPAR in pancreatic cancer cells. IL-1alpha enhanced the proliferation, adhesion, and migration in pancreatic cancer cells, and IL-1alpha-induced alterations of uPA/uPAR expression correlated with the increased the migration of pancreatic cancer cells. Upregulation of alpha6 integrin subunit and uPA/uPAR correlated with the activation of Ras and downstream extracellular signal-regulated kinase (ERK) pathways. IL-1alpha-induced activation of Ras and downstream ERK can be inhibited by using inhibitory antibodies against alpha6 and beta1 integrin and uPAR, consistent with the inhibition of proliferation, adhesion and migration of pancreatic cancer cells. Immunohistochemical analysis demonstrated a significant association between strong expressions of alpha6 integrin with uPAR in pancreatic cancer specimens. Furthermore, the strong expression of alpha6 integrin and uPAR was found to be independent prognosticator in pancreatic cancer patients.

Conclusion: Based on these findings, we conclude that IL-1alpha can induce selective upregulation of alpha6beta1-integrin and uPA/uPAR in pancreatic cancer cells and these changes may modulate the aggressive functions of pancreatic cancer.

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