Receptor tyrosine kinases and TLR/IL1Rs unexpectedly activate myeloid cell PI3kγ, a single convergent point promoting tumor inflammation and progression.

Receptor tyrosine kinases and TLR/IL1Rs unexpectedly activate myeloid cell PI3kγ, a single convergent point promoting tumor inflammation and progression.
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DOI:
10.1016/j.ccr.2011.04.016
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发表时间:
2011-06-14
期刊:
影响因子:
50.3
通讯作者:
Varner JA
Varner JA
中科院分区:
医学1区
文献类型:
--
作者:
Schmid MC;Avraamides CJ;Dippold HC;Franco I;Foubert P;Ellies LG;Acevedo LM;Manglicmot JR;Song X;Wrasidlo W;Blair SL;Ginsberg MH;Cheresh DA;Hirsch E;Field SJ;Varner JA

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Tumor inflammation promotes angiogenesis, immunosuppression and tumor growth, but the mechanisms controlling inflammatory cell recruitment to tumors are not well understood. We found that a range of chemoattractants activating G-protein coupled receptors (GPCRs), receptor tyrosine kinases (RTKs) and Toll-like/IL-1 receptors (TLR/IL1Rs) unexpectedly initiate tumor inflammation by activating the PI3-kinase isoform p110γ in Gr1+CD11b+ myeloid cells. Whereas GPCRs activate p110γ in a Ras/p101 dependent manner, RTKs and TLR/IL1Rs directly activate p110γ in a Ras/p87-dependent manner. Once activated, p110γ promotes inside-out activation of a single integrin, α4β1, causing myeloid cell invasion into tumors. Pharmacological or genetic blockade of p110γ suppressed inflammation, growth and metastasis of implanted and spontaneous tumors, revealing an important therapeutic target in oncology.
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