β-catenin signaling and regulation of cyclin D1 promoter in NRK-49F cells transformed by down-regulation of the tumor suppressor lysyl oxidase

Monia Giampuzzi, Roberta Oleggini, Chris Albanese, Richard Pestell, Armando Di Donato

Research output: Contribution to journalArticlepeer-review

Abstract

Lysyl oxidase is the enzyme that is essential for collagen and elastin cross-linking. Previous investigations showed that lysyl oxidase is down-regulated in many human tumors and ras-transformed cells. Recently, we proved that antisense down-regulation of lysyl oxidase in NRK-49F cells induced phenotypic changes and oncogenic transformation, characterized by p21 ras activation and β-catenin/cyclin D1 up-regulation. In the present paper, we examined β-catenin intracellular distribution and its association with E-cadherin. We observed an increased association between E-cadherin and β-catenin in the lysyl-oxidase down-regulated cells during serum starvation. Moreover, we found that β-catenin cytoplasmic and nuclear levels were increased, suggesting a failure of its down-regulation by the APC-GSK-3β system, in particular the GSK-3β phosphorylation of ser-33/37 and thr-41 of β-catenin. Finally, we investigated the mechanisms leading to the observed cyclin D1 up-regulation. We showed that in the antisense lysyl oxidase cells the cyclin D1 promoter was activated through the LEF and the ATF/CRE sites in the proximal promoter. While the promoter activation through LEF is compatible with β-catenin signaling, we investigated the possibility that the CRE-dependent activation might be linked to the down-regulation of lysyl oxidase. In fact, up-regulation of lysyl oxidase in a COS-7 cell model showed a significant diminution of the CREB protein binding to the cyclin D1 promoter, leading to a dramatic inhibition of its activity and a significant down-regulation of cyclin D1 protein level in vivo. Finally, our study describes some major anomalies occurring in lysyl oxidase down-regulated fibroblasts, related to β-catenin signaling and cyclin D1 expression.

Original languageEnglish
Pages (from-to)370-381
Number of pages12
JournalBiochimica et Biophysica Acta - Molecular Cell Research
Volume1745
Issue number3
DOIs
Publication statusPublished - Sep 30 2005

Keywords

  • β-catenin
  • CREB
  • Cross-link
  • Cyclin D1
  • Gene promoter regulation
  • Lysyl oxidase
  • ras
  • TCF

ASJC Scopus subject areas

  • Biophysics
  • Cell Biology
  • Molecular Biology

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