Nuclear factor E2 p45-related factor 2 negatively regulates chondrogenesis

Eiichi Hinoi, Takeshi Takarada, Sayumi Fujimori, Liyang Wang, Mika Iemata, Kyosuke Uno, Yukio Yoneda

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

The transcription factor nuclear factor E2 p45-related factor 2 (Nrf2) forms heterodimers with small musculoaponeurotic fibrosarcoma (Maf) proteins for the selective recognition of the antioxidant responsive element on target genes, followed by the regulation of gene expression of phase II detoxifying enzymes as well as oxidative-stress-inducible proteins in different tissues. In the present study, we investigated the role of Nrf2 in the regulation of chondrocyte differentiation as well as the expression pattern of Nrf2 in cartilage. In tibia from embryonic mice at E15.5, Nrf2 mRNA expression was restricted to both proliferating and pre-hypertrophic chondrocytes, with few signals in early and late hypertrophic chondrocytes expressing both type X collagen and osteopontin. On in situ hybridization analysis of tibia from neonatal mice at 1 day after birth, by contrast, Nrf2 was expressed in all chondrocytic layers in addition to osteoblasts attached to cancellous bone. In pre-chondrogenic cell line ATDC5 cells, furthermore, expression of Nrf2 mRNA was also confirmed together with mRNA expression of the Kelch-like ECH associating protein 1 and small Maf proteins. In ATDC5 cells stably transfected with Nrf2, significant inhibition was seen in the differentiation-dependent induction of alkaline phosphatase and increase in the Alcian blue staining intensity. Furthermore, stable overexpression of Nrf2 significantly decreased mRNA expression of several chondrocyte differentiation markers such as type II collagen, type X collagen and osteopontin. These data suggest that Nrf2 may be a negative regulator of the cellular differentiation toward maturation in chondrocytes.

Original languageEnglish
Pages (from-to)337-344
Number of pages8
JournalBone
Volume40
Issue number2
DOIs
Publication statusPublished - Feb 2007
Externally publishedYes

Keywords

  • ATDC5 cells
  • Alcian blue
  • Cartilage
  • Chondrocyte
  • Nrf2
  • Stable overexpression

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Physiology
  • Histology

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