Cell and Tissue Research

, Volume 355, Issue 1, pp 163–171 | Cite as

TGF-ß induces Lysyl hydroxylase 2b in human synovial osteoarthritic fibroblasts through ALK5 signaling

  • Dennis F. G. Remst
  • Esmeralda N. Blaney Davidson
  • Elly L. Vitters
  • Ruud A. Bank
  • Wim B. van den Berg
  • Peter M. van der Kraan
Regular Article

Abstract

Lysyl hydroxylase 2b (LH2b) is known to increase pyridinoline cross-links, making collagen less susceptible to enzymatic degradation. Previously, we observed a relationship between LH2b and osteoarthritis-related fibrosis in murine knee joint. For this study, we investigate if transforming growth factor-beta (TGF-ß) and connective tissue growth factor (CTGF) regulate procollagen-lysine, 2-oxoglutarate 5-dioxygenase 2 (PLOD2) (gene encoding LH2b) and LH2b expression differently in osteoarthritic human synovial fibroblasts (hSF). Furthermore, we investigate via which TGF-ß route (Smad2/3P or Smad1/5/8P) LH2b is regulated, to explore options to inhibit LH2b during fibrosis. To answer these questions, fibroblasts were isolated from knee joints of osteoarthritis patients. The hSF were stimulated with TGF-ß with or without a kinase inhibitor of ALK4/5/7 (SB-505124) or ALK1/2/3/6 (dorsomorphin). TGF-ß, CTGF, constitutively active (ca)ALK1 and caALK5 were adenovirally overexpressed in hSF. The gene expression levels of PLOD1/2/3, CTGF and COL1A1 were analyzed with Q-PCR. LH2 protein levels were determined with western blot. As expected, TGF-ß induced PLOD2/LH2 expression in hSF, whereas CTGF did not. PLOD1 and PLOD3 were not affected by either TGF-ß or CTGF. SB-505124 prevented the induction of TGF-ß-induced PLOD2, CTGF and COL1A1. Surprisingly, dorsomorphin completely blocked the induction of CTGF and COL1A1, whereas TGF-ß-induced PLOD2 was only slightly reduced. Overexpression of caALK5 in osteoarthritic hSF significantly induced PLOD2/LH2 expression, whereas caALK1 had no effect. We showed, in osteoarthritic hSF, that TGF-ß induced PLOD2/LH2 via ALK5 Smad2/3P. This elevation of LH2b in osteoarthritic hSF makes LH2b an interesting target to interfere with osteoarthritis-related persistent fibrosis.

Keywords

Lysyl hydroxylase 2b Fibrosis Osteoarthritis Synovium TGF-ß 

Abbreviations

Ad

Adenovirus

ALK

Activin receptor-like kinase

ca

Constitutively active

COL1A1

Collagen, type I, alpha 1

CTGF

Connective tissue growth factor

hSF

Human synovial fibroblasts

LH

Lysyl hydroxylase

MMP

Matrix metalloproteinases

PLOD2

Procollagen-lysine, 2-oxoglutarate 5-dioxygenase 2

TGF-ß

Transforming growth factor-beta

Notes

Acknowledgments

The authors would like to thank MJ Goumans and Peter ten Dijke (Leiden University Medical Center). This study was supported by a grant from the Dutch Arthritis Association (grant NR 09-1-403).

Supplementary material

441_2013_1740_Fig5_ESM.jpg (26 kb)
Fig. 1S

Human synovial fibroblasts (original magnification ×25) (JPEG 25 kb)

441_2013_1740_MOESM1_ESM.tif (748 kb)
High resolution image (TIFF 747 kb)
441_2013_1740_Fig6_ESM.jpg (22 kb)
Fig. 2S

Dorsomorphin inhibits caALK1-induced Smad1/5/8P. Human synovial fibroblasts were transduced with Ad-caALK1 or Ad-Luc, which was used as control and cultured for 24 h. Thereafter the cells were cultured for another 24 h in the presence of dorsomorphin or DMSO and subsequently harvested for Western blot analysis. Both the basal as well as the caALK1-induced Smad1/5/8P were inhibited by dorsomorphin (5 μM) (JPEG 21 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Dennis F. G. Remst
    • 1
  • Esmeralda N. Blaney Davidson
    • 1
  • Elly L. Vitters
    • 1
  • Ruud A. Bank
    • 2
  • Wim B. van den Berg
    • 1
  • Peter M. van der Kraan
    • 1
  1. 1.Rheumatology Research and Advanced TherapeuticsRadboud University Nijmegen Medical CentreNijmegenThe Netherlands
  2. 2.Medical Biology Section, Stem Cell and Tissue Engineering GroupUniversity Medical Center GroningenGroningenThe Netherlands

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