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Effects of hexosamines and omega-3/omega-6 fatty acids on pH regulation by interleukin 1-treated isolated bovine articular chondrocytes

  • Cell and Molecular Physiology
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Abstract

Previous work has shown that interleukin 1 (IL-1) increases the activity of acid extruders in articular chondrocytes, while the H+-adenosine triphosphatase (ATPase) inhibitor bafilomycin can prevent aggrecanase-mediated cartilage degradation. The H+ transport induced by IL-1 may therefore be required for proteinase activity. In the present study, the effects of hexosamines and fish oils on H+-ATPase activity have been characterised for isolated bovine articular chondrocytes. Cells isolated in the presence of IL-1 were acidified, and the fraction of acid extrusion mediated by Na+–H+ exchange and an H+-ATPase were determined using specific inhibitors. Exposure to IL-1 significantly enhanced both components of acid extrusion. Co-incubation with glucosamine or mannosamine attenuated the H+-ATPase fraction of efflux. The addition of glucosamine at 9 h after exposure to IL-1—when H+-ATPase activation is already apparent—was also able to abolish H+-ATPase activity, implying that hexosamines do not exert effects at the level of protein synthesis. Co-incubation with the glucose transport inhibitor phloretin elicited similar effects to the hexosamines, suggesting that modulation of adenosine triphosphate levels may underlie their effects on H+-ATPase function. The omega-3 fish oil linolenic acid but not the omega-6 fish oil linoleic acid reduced H+-ATPase activity to levels seen in IL-1-untreated cells, although total efflux remained elevated, as a result of an enhanced H+ leak. These observations support a model whereby IL-1 stimulates an H+-ATPase-dependent system, possibly involved in aggrecanase activation, which appears to be one of the target mechanisms interrupted by dietary supplements reported to have symptom-modifying effects on osteoarthritis.

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Acknowledgements

ALT held a MRC Studentship.

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  1. Department of Physiology, Anatomy and Genetics, University of Oxford, Sherrington Building, Parks Road, Oxford, OX1 3PT, UK

    Amanda L. Tattersall & Robert J. Wilkins

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  1. Amanda L. Tattersall
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  2. Robert J. Wilkins
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Correspondence to Robert J. Wilkins.

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Tattersall, A.L., Wilkins, R.J. Effects of hexosamines and omega-3/omega-6 fatty acids on pH regulation by interleukin 1-treated isolated bovine articular chondrocytes. Pflugers Arch - Eur J Physiol 456, 501–506 (2008). https://doi.org/10.1007/s00424-007-0425-x

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  • DOI: https://doi.org/10.1007/s00424-007-0425-x

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