Analyses on the mechanisms that underlie the chondroprotective properties of calcitonin

Research output: Contribution to journalArticle

Authors

  • Karin V Greco
  • Giovanna Nalesso
  • Magdalena K Kaneva
  • Joanna Sherwood
  • Niloufar Moradi-Bidhendi
  • Francesco Dell'Accio
  • Mauro Perretti

Colleges, School and Institutes

External organisations

  • The William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, United Kingdom.
  • The William Harvey Research Institute, Barts and The London School of Medicine, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, United Kingdom. Electronic address: m.perretti@qmul.ac.uk.

Abstract

INTRODUCTION: Calcitonin (CT) has recently been shown to display chondroprotective effects. Here, we investigate the putative mechanisms by which CT delivers these actions.

METHODS: Immortalized C-28/I2 cells or primary adult human articular chondrocytes (AHAC) were cultured in high-density micromasses to investigate: (i) CT anabolic effects using qPCR and immuhistochemistry analysis; (ii) CT anti-apoptotic effects using quantitation of Bax/Bcl gene products ratio, TUNEL assay and caspase-3 expression; (iii) CT effects on CREB, COL2A1 and NFAT transcription factors.

RESULTS: CT (10-10-10-8nM) induced significant up-regulation of cartilage phenotypic markers (SOX9, COL2A1 and ACAN), with down-regulation of catabolic (MMP1 and MMP13 and ADAMTS5) gene products both in resting and inflammatory conditions. This was mirrored by an augmented production of type II collagen and accumulation of glycosaminoglycan- and proteoglycan-rich extracellular matrix in vitro. Mechanistic analyses revealed only partial involvement of cyclic AMP formation in these effects of CT. Congruently, using reporter assays for specific transcription factors, there was no indication for CREB activation, whereas the COL2A1 promoter was genuinely and directly activated by cell exposure to CT. Phenotypically, these mechanisms supported the ability of CT, whilst inactive on its own, to counteract the pro-apoptotic effects of IL-1β, demonstrated by TUNEL-positive staining of chondrocytes and ratio of BAX/BCL genes products.

CONCLUSION: These data may provide a novel lead for the development of CT-based chondroprotective strategies that rely on the engagement of mechanisms that lead to augmented chondrocyte anabolism and inhibited chondrocyte apoptosis.

Details

Original languageEnglish
Pages (from-to)348-358
Number of pages11
JournalBiochemical Pharmacology
Volume91
Issue number3
Early online date10 Aug 2014
Publication statusPublished - 1 Oct 2014

Keywords

  • ADAM Proteins, ADAMTS5 Protein, Aggrecans, Apoptosis, Biomarkers, Calcitonin, Cartilage, Articular, Cells, Cultured, Chondrocytes, Collagen Type II, Cyclic AMP, Cyclic AMP-Dependent Protein Kinases, Glycosaminoglycans, Humans, Matrix Metalloproteinase 1, Matrix Metalloproteinase 13, Protective Agents, SOX9 Transcription Factor, Signal Transduction, Journal Article