Department of Pediatrics
Cell Line; Colostrum; Female; Gene Expression; Humans; Interferon-gamma; Macrophages; Membrane Glycoproteins; Monocytes; NADPH Oxidase; Pregnancy; Tumor Necrosis Factor-alpha
Amino Acids, Peptides, and Proteins | Cell Biology | Hematology | Oncology | Pediatrics
The aim of this work was to analyze the effect of Interferon-gamma (IFN-gamma) and tumor necrosis factor-alpha (TNF-alpha) on NADPH oxidase activity and gp91-phox gene expression in human colostrum macrophages (CM), peripheral blood monocytes (PBM), and myelomonocytic THP-1 cells. We also investigated the effect of IFN-gamma on the release of TNF-alpha by these cells. Our results show that under basal culture conditions, CM release more superoxide than PBM and THP-1 cells (p andlt; 0.05). The addition of IFN-gamma, alone or in combination with TNF-alpha, increased spontaneous superoxide release by PBM and THP-1 cells (p andlt; 0.05) and increased phorbol myristate acetate (PMA)-stimulated superoxide release by CM, PBM, and THP-1 cells (p andlt; 0.05). The NADPH oxidase activity of THP-1 cells consistently remained lower than that of CM or PBM, despite a dramatic response to IFN-gamma and TNF-alpha. Under basal conditions, gp91-phox gene expression was significantly higher in CM and PBM compared with THP-1 cells (p andlt; 0.05). The addition of IFN-gamma alone or in combination with TNF-alpha caused a dramatic increase in gp91-phox gene expression in THP-1 cells (p andlt; 0.05) but not in CM or PBM. Under basal conditions or in the presence of IFN-gamma, CM released more TNF-alpha than PBM or THP-1 cells (p andlt; 0.05). In addition, PBM released more TNF-gamma than THP-1 cells (p andlt; 0.05). IFN-gamma did not significantly augment the release of TNF-alpha by these cells (p > 0.05). Thus, IFN-gamma and TNF-alpha induced equivalent gp91-phox gene expression in THP-1 cells compared with CM or PBM but did not bring about equivalent NADPH oxidase activity. TNF-alpha release was higher in more mature cells. This partial divergence of gp91- phox gene expression, NADPH oxidase activity, and TNF-alpha release is probably a consequence of different events of myeloid cell biology and relates at least in part to cell differentiation state.
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This is a copy of an article published in the Journal of Interferon and Cytokine Research © 2005 copyright Mary Ann Liebert, Inc. and available online at: http://online.liebertpub.com.
DOI of Published Version
J Interferon Cytokine Res. 2005 Sep;25(9):540-6. doi: 10.1089/jir.2005.25.540. Link to article on publisher's website
Journal of interferon and cytokine research : the official journal of the International Society for Interferon and Cytokine Research
Almeida, Ana Carolina; Rehder, Jussara; Severino, Silvana Dalge; Martins-Filho, Jose; Newburger, Peter E.; and Condino-Neto, Antonio, "The effect of IFN-gamma and TNF-alpha on the NADPH oxidase system of human colostrum macrophages, blood monocytes, and THP-1 cells" (2005). Hematology/Oncology. 73.