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- W1990735136 abstract "Using a zymosan-induced mouse model of multiple organ dysfunction syndrome (MODS), we previously found profound increases in spleen immune cells’ expressions of ubiquitin and MHC-II molecules and increased CD11c+ dendritic cells (DCs) within 24 h of zymosan injection. We postulated that the early stage of MODS altered DCs function via an ubiquitination-associated mechanism. We intraperitoneally injected zymosan into 100 male C57BL/6 mice (0.8 mg/g) and randomly divided them into 5 groups based on the days after injection (20 mice/group): 1 d, 3 d, 5 d, 7 d, and 10 d. Mice were examined for spleen CD11c+ DC functions at the indicated days. Untreated mice were used for normal spleen tissue and T cell samples. By qPCR, IL-12 and TNF-α mRNA expressions in spleen CD11c+ DCs were significantly increased in MODS 1 d mice; on subsequent days post-injection, these mRNA levels gradually returned to control levels. The same patterns were found for MODS mice DCs induction of untreated mouse T cells proliferation and IL-2 and IFN-γ mRNA expressions. When T cell functions were examined using MODS 1 d DCs with and without MG132 treatment, an inhibitor of ubiquitinated protein degradation, T cell functional activities were enhanced by DCs treated with MG132. MODS 1 d DCs also had significantly reduced MARCH1 mRNA expression, a key ubiquitin ligase that regulates DCs MHC-II expression. Silencing DCs MARCH1 expression with siRNA resulted in enhancing their induction of T cell functional activities. Using co-immunoprecipitation, Western blot, and flow cytometry assays, we deduced that MARCH1 ubiquitinated DC surface MHC-II molecules to regulate DC's immune functions in MODS mice. Our results suggest that aberrant degradation of spleen DCs MARCH1-mediated ubiquitinated proteins is involved during the earliest stage of MODS development." @default.
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- W1990735136 date "2013-02-01" @default.
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- W1990735136 title "Altered MARCH1 ubiquination-regulated dendritic cell immune functions during the early stage of zymosan-induced multiple organ dysfunction syndrome (MODS) in mice" @default.
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- W1990735136 doi "https://doi.org/10.1016/j.imlet.2012.12.012" @default.
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