Production of monocyte chemoattractant protein-1 by bovine glomerular endothelial cells

Kidney International
Y KakizakiM Yokoyama

Abstract

To explore the role of glomerular endothelial cells (GEN) in the pathogenesis of glomerulonephritis, the in vitro production of monocyte chemoattractant protein-1 (MCP-1) by bovine GEN was determined by chemotaxis assay, and Western blot analysis, and immunocytochemistry. Monocyte chemotactic activity of GEN-conditioned media was detectable by a chemotaxis assay using human peripheral blood monocytes. Exposure to human recombinant interleukin-1 beta (IL-1 beta) and phorbol myristate acetate (PMA) significantly increased the chemotactic activity of GEN-conditioned media. A checkerboard analysis showed that the response of monocytes to GEN-conditioned media was truly chemotactic. Immunoadsorption with a monoclonal antibody to human MCP-1 reduced the chemotactic activity of GEN-conditioned media by 85%. Northern blot analysis revealed that MCP-1 mRNA was constitutively expressed by GEN and that IL-1 beta and tumor necrosis factor-alpha (TNF-alpha) increased MCP-1 mRNA levels in a dose- and time-dependent manner. Furthermore, PMA induced an increase in MCP-1 mRNA levels, whereas dibutyryl cyclic AMP and forskolin had minimal effects. Inhibition study using protein kinase inhibitors revealed that MCP-1 mRNA expression induced by IL-...Continue Reading

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Citations

Jan 7, 2006·Urological Research·Pouran Habibzadegah-TariSaeed R Khan
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