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Primary tumours modulate innate immune signalling to create pre-metastatic vascular hyperpermeability foci.

ABSTRACT: In mouse models of lung metastasis, before the appearance of significant metastases, localized changes in vascular permeability have been observed, which appear to set the stage for tumour growth. However, it is unclear whether this is also true in human patients. Here, we show that MD-2, a coreceptor for Toll-like receptor 4 that has a key role in the innate immune response, triggers the formation of regions of hyperpermeability in mice by upregulating C-C chemokine receptor type 2 (CCR2) expression. The CCR2-CCL2 system induces the abundant secretion of permeability factors such as serum amyloid A3 and S100A8. Disruption of MD-2 or CCR2 abrogates the formation of hyperpermeable regions, resulting in reduced tumour cell homing. Furthermore, fibrinogen, which is processed during permeability-mediated coagulation, is also localized in areas of elevated CCR2 expression in tumour-bearing human lungs. Our findings raise the possibility that CCR2 upregulation might represent a marker for regions of increased susceptibility to metastatic homing in lung cancer.

SUBMITTER: Hiratsuka S

PROVIDER: S-EPMC3674255 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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Primary tumours modulate innate immune signalling to create pre-metastatic vascular hyperpermeability foci.

Hiratsuka Sachie S Ishibashi Sachie S Tomita Takeshi T Watanabe Akira A Akashi-Takamura Sachiko S Murakami Masato M Kijima Hiroshi H Miyake Kensuke K Aburatani Hiroyuki H Maru Yoshiro Y

Nature communications 20130101

In mouse models of lung metastasis, before the appearance of significant metastases, localized changes in vascular permeability have been observed, which appear to set the stage for tumour growth. However, it is unclear whether this is also true in human patients. Here, we show that MD-2, a coreceptor for Toll-like receptor 4 that has a key role in the innate immune response, triggers the formation of regions of hyperpermeability in mice by upregulating C-C chemokine receptor type 2 (CCR2) expre ...[more]

PMID: 23673638

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Project description:BackgroundIn sepsis, the endothelial barrier becomes incompetent, with the leaking of plasma into interstitial tissues. VE-cadherin, an adherens junction protein, is the gatekeeper of endothelial cohesion. Kinins, released during sepsis, induce vascular leakage and vasodilation. They act via two G-protein coupled receptors: B1 (B1R) and B2 (B2R). B1R is inducible in the presence of pro-inflammatory cytokines, endotoxins or after tissue injury. It acts at a later stage of sepsis and elicits a sustained inflammatory response. The aim of our study was to investigate the relationships between B1R and VE-cadherin destabilization in vivo in a later phase of sepsis.MethodsExperimental, prospective study in a university research laboratory. We used a polymicrobial model of septic shock by cecal ligation and puncture in C57BL6 male mice or C57BL6 male mice that received a specific B1R antagonist (R-954). We studied the influence of B1R on sepsis-induced vascular permeability 30 h after surgery for several organs, and VE-cadherin expression in the lung and kidneys by injecting R-954 just before surgery. The 96-h survival was determined in mice without treatment or in animals receiving R-954 as a "prophylactic" regimen (a subcutaneous injection of 200 µg/kg, prior to CLP and 24 h after CLP), or as a "curative" regimen (injection of 100 µg/kg at H6, H24 and H48 post-surgery).ResultsB1R inactivation helps to maintain MAP above 65 mmHg but induces different permeability profiles depending on whether or not organ perfusion is autoregulated. In our model, VE-cadherin was destabilized in vivo during septic shock. At a late stage of sepsis, the B1R blockade reduced the VE-cadherin disruption by limiting eNOS activation. The survival rate for mice that received R-954 after sepsis induction was higher than in animals that received an antagonist as a prophylactic treatment.ConclusionsB1R antagonizing reduced mortality in our model of murine septic shock by limiting the vascular permeability induced by VE-cadherin destabilization through maintenance of the macrohemodynamics, consequently limiting organ dysfunctions.

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Primary tumours modulate innate immune signalling to create pre-metastatic vascular hyperpermeability foci.

Publications

Primary tumours modulate innate immune signalling to create pre-metastatic vascular hyperpermeability foci.

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