Differential expression of constitutive and inducible proteasome subunits in human monocyte-derived DC differentiated in the presence of IFN-alpha or IL-4.

Differential expression of constitutive and inducible proteasome subunits in human monocyte-derived DC differentiated in the presence of IFN-alpha or IL-4.
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人单核细胞来源的 DC 中组成型和诱导型蛋白酶体亚基的差异表达在 IFN-α 或 IL-4 存在下发生分化。

DOI:
10.1002/eji.200738098
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发表时间:
2009
影响因子:
5.4
通讯作者:
Zanovello,Paola
Zanovello,Paola
中科院分区:
医学3区
文献类型:
--
作者:
Tosello,Valeria;Zamarchi,Rita;Merlo,Anna;Gorza,Margherita;Piovan,Erich;Mandruzzato,Susanna;Bronte,Vincenzo;Wang,Xinhui;Ferrone,Soldano;Amadori,Alberto;Zanovello,Paola

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Several studies strongly suggest that DC differentiatedin vitroin the presence of type I IFN acquire more potent immune stimulatory properties, compared with DC differentiatedin vitrowith IL‐4. However, little is known about the molecular mechanisms underlying this phenomenon. To address this question, we compared the Ag‐processing machinery (APM) profile in human DC grown in the presence of IFN‐α(IFNDC) or IL‐4 (IL‐4DC). Using a panel of APM component‐specific mAb in Western blot experiments, we found thatIFNDC preferentially express inducible proteasome subunits (LMP2, LMP7, and MECL1) both at immature and mature stages. In contrast, immatureIL‐4DC co‐express both constitutive (β1,β2, andβ5) and inducible subunits, as shown by Western blotting analysis. In addition, immatureIFNDC express higher levels of TAP1, TAP2, calnexin, calreticulin, tapasin, and HLA class I molecules thanIL‐4DC. The different proteasome profiles ofIFNDC andIL‐4DC were associated with a greater ability ofIFNDC to present an immunodominant epitope that requires LMP7 expression for its processing. In general, these data show the impact of cytokines on APM component expression and hence the Ag‐processing ability of DC.
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