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http://dx.doi.org/10.3347/kjp.2012.50.1.1

Anti-Apoptotic Effects of SERPIN B3 and B4 via STAT6 Activation in Macrophages after Infection with Toxoplasma gondii  

Song, Kyoung-Ju (The Catholic Institute of Parasitic Diseases, College of Medicine, The Catholic University of Korea)
Ahn, Hye-Jin (The Catholic Institute of Parasitic Diseases, College of Medicine, The Catholic University of Korea)
Nam, Ho-Woo (The Catholic Institute of Parasitic Diseases, College of Medicine, The Catholic University of Korea)
Publication Information
Parasites, Hosts and Diseases / v.50, no.1, 2012 , pp. 1-6 More about this Journal
Abstract
$Toxoplasma$ $gondii$ penetrates all kinds of nucleated eukaryotic cells but modulates host cells differently for its intracellular survival. In a previous study, we found out that serine protease inhibitors B3 and B4 (SERPIN B3/B4 because of their very high homology) were significantly induced in THP-1-derived macrophages infected with $T.$ $gondii$ through activation of STAT6. In this study, to evaluate the effects of the induced SERPIN B3/B4 on the apoptosis of $T.$ $gondii$-infected THP-1 cells, we designed and tested various small interfering (si-) RNAs of SERPIN B3 or B4 in staurosporine-induced apoptosis of THP-1 cells. Anti-apoptotic characteristics of THP-1 cells after infection with $T.$ $gondii$ disappeared when SERPIN B3/B4 were knock-downed with gene specific si-RNAs transfected into THP-1 cells as detected by the cleaved caspase 3, poly-ADP ribose polymerase and DNA fragmentation. This anti-apoptotic effect was confirmed in SERPIN B3/B4 overexpressed HeLa cells. We also investigated whether inhibition of STAT6 affects the function of SERPIN B3/B4, and vice versa. Inhibition of SERPIN B3/B4 did not influence STAT6 expression but SERPIN B3/B4 expression was inhibited by STAT6 si-RNA transfection, which confirmed that SERPIN B3/B4 was induced under the control of STAT6 activation. These results suggest that $T.$ $gondii$ induces SERPIN B3/B4 expression via STAT6 activation to inhibit the apoptosis of infected THP-1 cells for longer survival of the intracellular parasites themselves.
Keywords
Toxoplasma gondii; macrophage; SERPIN B3; B4; STAT6; anti-apoptosis;
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