Adenovirus-mediated gene transfer of glutamine: Fructose-6-phosphate amidotransferase antagonizes the effects of interluekin-1β on rat chondrocytes

J. N. Gouze, E. Gouze, G. D. Palmer, H. Kaneto, S. C. Ghivizzani, A. J. Grodzinsky, Christopher H Evans

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

Objective: To determine whether overexpression of glutamine: fructose-6-phosphate amidotransferase (GFAT) in synoviocytes will antagonize the response to interleukin-1β (IL-1β) of chondrocytes and synovial fibroblasts in co-culture. Methods: Synovial fibroblasts from the rat were transduced by an adenovirus carrying the cDNA for GFAT and then co-cultured with rat chondrocytes encapsulated in alginate beads. Following challenge with 1, 5, or 10 ng/ml of IL-1β for 24 h, proteoglycan synthesis by the chondrocytes was determined by incorporation of Na235SO4. Production of nitric oxide (NO) and prostaglandin E2 (PGE2) were monitored by assay of conditioned medium from the co-culture. Results: IL-1β treatment of untransduced-synoviocyte/chondrocyte co-cultures resulted in markedly decreased proteoglycan synthesis by the chondrocytes, and increased NO and PGE2 levels in the culture medium. In contrast, adenovirus-mediated transfer of GFAT in synoviocytes prevented both the decrease in chondrocyte proteoglycan synthesis and increases in NO and PGE2 provoked by IL-1β. Conclusions: Our study suggests that in a synoviocyte/chondrocyte co-culture system, overexpression of GFAT by synoviocytes significantly inhibits subsequent stimulation by IL-1β in vitro. Since GFAT is the rate limiting enzyme in the synthesis of intracellular glucosamine and its derivatives, these results may open new possibilities for osteoarthritis treatment.

Original languageEnglish (US)
Pages (from-to)217-224
Number of pages8
JournalOsteoarthritis and Cartilage
Volume12
Issue number3
DOIs
StatePublished - Mar 2004
Externally publishedYes

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Keywords

  • Gene transfer
  • GFAT
  • Glucosamine
  • IL-1

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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