Meprin A and meprin alpha generate biologically functional IL-1beta from pro-IL-1beta.

Meprin A and meprin alpha generate biologically functional IL-1beta from pro-IL-1beta.
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DOI:
10.1016/j.bbrc.2008.12.161
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发表时间:
2009-02-20
影响因子:
3.1
通讯作者:
Kaushal, Gur P.
Kaushal, Gur P.
中科院分区:
生物学4区
文献类型:
--
作者:
Herzog, Christian;Haun, Randy S.;Kaushal, Varsha;Mayeux, Philip R.;Shah, Sudhir V.;Kaushal, Gur P.

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本研究证实从肾皮质中纯化的寡聚金属内肽酶meprin A和重组meprin α能够从其前体pro-IL-1β产生具有生物学活性的IL-1β。氨基酸测序分析显示,meprin A和meprin α在His 115-Asp 116键处切割pro-IL-1β,该键位于caspase-1切割位点N端的一个氨基酸和meprin β位点C端的五个氨基酸。通过辅助T细胞的增殖反应测定,由meprin A产生的pro-IL-1β裂解产物的生物活性比由meprin β或半胱天冬酶-1产生的IL-1β产物的生物活性高3倍。在盲肠结扎穿孔诱导的脓毒症小鼠模型中,导致血清IL-1β水平升高,美普林抑制剂放线菌素显著降低血清IL-1β水平。因此,Meprin A和Meprin α可能在炎症和组织损伤期间活性IL-1β的产生中起关键作用。
The present study demonstrates that the oligomeric metalloendopeptidase meprin A purified from kidney cortex and recombinant meprin α are capable of generating biologically active IL-1β from its precursor pro-IL-1β. Amino-acid sequencing analysis reveals that meprin A and meprin α cleave pro-IL-1β at the His115-Asp116 bond, which is one amino acid N-terminal to the caspase-1 cleavage site and five amino acids C-terminal to the meprin β site. The biological activity of the pro-IL-1β cleaved product produced by meprin A, determined by proliferative response of helper T-cells, was 3-fold higher to that of the IL-1β product produced by meprin β or caspase-1. In a mouse model of sepsis induced by cecal ligation puncture that results in elevated levels of serum IL-1β, meprin inhibitor actinonin significantly reduces levels of serum IL-1β. Meprin A and meprin α may therefore play a critical role in the production of active IL-1β during inflammation and tissue injury.
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