Application of specific cell permeable cathepsin G inhibitors resulted in reduced antigen processing in primary dendritic cells

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• 作者：Michael Reich ; Adam Lesner ; Anna Ł ; ę ; gowska ; Marcin Sień ; czyk ; Jozef Oleksyszyn ; Bernhard O. Boehm ; Timo Burster
• 关键词：Antigen presentation/processing ; Cathepsin G ; Specific-CatG inhibitors
• 刊名：Molecular Immunology
• 出版年：2009
• 出版时间：September 2009
• 年：2009
• 卷：46
• 期：15
• 页码：2994-2999
• 全文大小：609 K

文摘

The serine protease cathepsin G (CatG) is expressed in primary antigen-presenting cells and regulates autoantigen processing in CatG pre-loaded fibroblasts. To further investigate the function of CatG in the major histocompatibility complex (MHC) class II loading compartments, a specific, cell permeable CatG-inhibitor is needed. In this study, several CatG-inhibitors were tested for their ability to penetrate the cell membrane of peripheral blood mononuclear cells (PBMC). We find that the commercially available reversible CatG-specific inhibitor I (CatG inhibitor) and the irreversible Suc-Val-Pro-Phe^P (OPh)₂ (Suc-VPF) are both cell permeable and specifically inhibit intracellular CatG in the PBMC. Furthermore, selective inhibition of CatG resulted in reduced tetanus toxin C-fragment (TTC) and hemagglutinin (HA) processing and presentation to CD4⁺ T cells. We conclude that these CatG inhibitors can be used for both antigen-processing studies and for modulation of T cell response in situ and in vivo.