Abstract
Monocyte/Macrophages are integral cellular components of inflammation. Matrix metalloproteinases (MMPs) produced by these cells play a crucial role in every aspect of inflammation. Results of the investigations on activation dependent upregulation of MMPs in human peripheral blood mononuclear cells in culture using different lectins as an in vitro model system to mimic inflammatory monocytes are presented. Under normal physiological conditions the monocytes produced only very low amount of MMPs in an indomethacin insensitive PG/cAMP independent manner. Zymographic analysis and ELISA showed that treatment of monocyte with lectins like concanavalin A (ConA), wheat germ agglutinin (WGA) and Artocarpus lakoocha agglutinin (ALA) caused upregulation of MMPs and the maximum effect was produced by ALA. ALA significantly upregulated MMP-9 in a concentration and time dependent manner. Immunoblot analysis and RT-PCR confirmed ALA mediated upregulation of MMP-9 production. Inhibition of ALA effect by indomethacin and reversal of the indomethacin effect by Bt2cAMP indicated involvement of cAMP dependent signaling pathway. Further support for the prostaglandin mediated effect was obtained by the upregulation of cyclooxygenase by ALA. H-89, an inhibitor of protein kinase A (PKA), inhibited the expression of MMP-9 indicating that ALA mediated upregulation of MMP-9 is mediated through PKA pathway. Increase in MMP production and increase in cyclooxygenase activity and inhibition of the effect of ALA on MMP production by indomethacin suggested that the ALA activated monocytes in culture can be used as an in vitro model system to study the intracellular signaling process involved in the mediation of inflammatory response.
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K. Saja was supported by research fellowship from Council of Scientific and Industrial Research, New Delhi.
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Saja, K., Chatterjee, U., Chatterjee, B.P. et al. Activation dependent expression of MMPs in peripheral blood mononuclear cells involves protein kinase A. Mol Cell Biochem 296, 185–192 (2007). https://doi.org/10.1007/s11010-006-9314-4
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DOI: https://doi.org/10.1007/s11010-006-9314-4