Arthritis suppressor genes TIA-1 and TTP dampen the expression of tumor necrosis factor α, cyclooxygenase 2, and inflammatory arthritis
Arthritis suppressor genes TIA-1 and TTP dampen the expression of tumor necrosis factor α, cyclooxygenase 2, and inflammatory arthritis
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DOI:
10.1073/pnas.0400148101
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发表时间:
2004-02-17
影响因子:
11.1
通讯作者:
Anderson, P
中科院分区:
文献类型:
--
作者:
Phillips, K;Kedersha, N;Anderson, P
TIA-1 and TTP are AU-rich element-binding proteins that prevent the pathological overexpression of tumor necrosis factor alpha (TNF-alpha). TIA-1 inhibits the translation of TNF-alpha transcripts, whereas TTP promotes the degradation of TNF-alpha transcripts. Here we show that TIA-1 and TTP function as arthritis suppressor genes: TIA-1(-/-) mice develop mild arthritis, TTP-/- mice develop severe arthritis, and TIA-1(-/-)TTP(-/-) mice develop very severe arthritis. Peritoneal macrophages derived from all three genotypes overexpress cyclooxygenase 2 and TNF-a. Surprisingly, lipopolysaccharide-activated TIA-1(-/-)TTP(-/-) macrophages secrete less TNF-alpha protein than either TIA-1(-/-) or TTP-/- macrophages. In these mice, arthritogenic cytokine may be produced by neutrophils that accumulate in the bone marrow and peripheral blood. our results suggest that TIA-1 and TTP are genetic modifiers of inflammatory arthritis that can alter the spectrum of cells that produce arthritogenic cytokines.