The immunoproteasome controls the availability of the cardioprotective pattern recognition molecule Pentraxin3

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• 作者：Anna Paeschke ; Anna Possehl ; Karin Klingel ; Martin Voss ; Karolin Voss ; Meike Kespohl ; Martina Sauter ; Hermen S. Overkleeft ; Nadine Althof ; Cecilia Garlanda and Antje Voigt
• 关键词：Infection ; Inflammation ; Innate immunity ; Myocarditis ; Pentraxin3 ; Proteasome ; Stress response ; Virus
• 刊名：European Journal of Immunology
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：46
• 期：3
• 页码：619-633
• 全文大小：1707K
• ISSN：1521-4141

文摘

Cardiomyocyte death as a result of viral infection is an excellent model for dissecting the inflammatory stress response that occurs in heart tissue. We reported earlier that a specific proteasome isoform, the immunoproteasome, prevents exacerbation of coxsackievirus B3 (CVB3)-induced myocardial destruction and preserves cell vitality in heart tissue inflammation. Following the aim to decipher molecular targets of immunoproteasome-dependent proteolysis, we investigated the function and regulation of the soluble PRR Pentraxin3 (PTX3). We show that the ablation of PTX3 in mice aggravated CVB3-triggered inflammatory injury of heart tissue, without having any significant effect on viral titers. Thus, there might be a role of PTX3 in preventing damage-associated molecular pattern-induced cell death. We found that the catalytic activity of the immunoproteasome subunit LMP7 regulates the timely availability of factors controlling PTX3 production. We report on immunoproteasome-dependent alteration of ERK1/2 and p38MAPKs, which were both found to be involved in PTX3 expression control. Our finding of a cardioprotective function of immunoproteasome-dependent PTX3 expression revealed a crucial mechanism of the stress-induced damage response in myocardial inflammation. In addition to antigen presentation and cytokine production, proteolysis by the immunoproteasome can also regulate the innate immune response during viral infection.