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A critical role for the inducible proteasomal subunits LMP7 and MECL1 in cytokine production by activated murine splenocytes.

Pharmacology. 2012;89(3-4):117-26. Epub 2012 Mar 07
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摘要


BACKGROUND AND PURPOSE:The proteasome is a multi-subunit complex that proteolytically cleaves proteins. The replacement of the constitutive proteasome subunits β1, β2, and/or β5 with the IFNγ-inducible subunits LMP2, MECL1, and/or LMP7 results in the 'immunoproteasome'. The inducible subunits change the cleavage specificities of the proteasome, but it is unclear whether they have functions in addition to this. The purpose of the present study was to determine the role of the proteasome in general, as well as LMP7 and MECL1 specifically, with regard to cytokine production by activated primary splenocytes. METHODS:A LMP7/MECL1-null mouse was engineered to determine the roles of these subunits in cytokine production. Isolated splenocytes from wild-type and LMP7/MECL1-/- mice were treated with lactacystin and activated with PMA and ionomycin and subsequently cytokine mRNA levels were quantified. RESULTS:The present study demonstrates that LMP7/MECL1 regulates the expression of IFNγ, IL4, IL10, IL2Rβ, GATA3, and t-bet. In contrast, the regulation of IL2, IL13, TNFα, and IL2Rα by the proteasome appears to occur independently of LMP7/MECL1. CONCLUSIONS:Collectively, the present study demonstrates that LMP7 and MECL1 regulate cytokine expression, suggesting this system represents a novel mechanism for the regulation of cytokines and cytokine signaling.

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