Paracrine signalling in colorectal liver metastases involving tumor cell-derived PDGF-C and hepatic stellate cell-derived PAK-2

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• 作者：Obul R. Bandapalli (1)
  Stephan Macher-Goeppinger (1)
  Peter Schirmacher (1)
  Karsten Brand (1)
  
• 关键词：Colorectal liver metastasis ; HSC ; LS174T ; PAK2 ; PDGFC
• 刊名：Clinical & Experimental Metastasis
• 出版年：2012
• 出版时间：June 2012
• 年：2012
• 卷：29
• 期：5
• 页码：409-417
• 全文大小：721KB
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• 作者单位：Obul R. Bandapalli (1)
  Stephan Macher-Goeppinger (1)
  Peter Schirmacher (1)
  Karsten Brand (1)
  
  1. Department of General Pathology, Institute of Pathology, University Hospital Heidelberg, University of Heidelberg, Im Neuenheimer Feld 220/221, 69120, Heidelberg, Germany
  
• ISSN：1573-7276

文摘

In a nude mouse model of colorectal liver metastases, we have identified a paracrine tumor cell/host cell signalling pathway that is apparently required for successful tumor growth. Whereas recombinant platelet derived growth factor-C (PDGF-C) and supernatants from PDGF-C secreting wild type LS174T colon carcinoma cells could rescue tumor promoting hepatic stellate cells (HSC) from growth inhibition by serum starvation, supernatants from LS174T colon carcinoma cells with reduced secretion of PDGF-C had much less effect on serum starved HSC. Autocrine growth inhibition of LS174T cells by PDGF-C knock-down was only marginal. In vivo, a prominent inhibition of liver metastasis was observed if PDGF-C was knocked-down in LS174T cells. By whole genome array analysis of host cells of the invasion front and subsequent immunohistochemical staining we identified p21 activated kinase-2 (PAK-2) as being strongly and specifically expressed by HSC. The above described effect of PDGF-C on HSC was found to be dependent on PAK-2 because in contrast to wild type HSC, silencing of PAK-2 in HSC only allowed for a partial PDGF-C-mediated rescue from serum starvation leading to only a slight increase of proliferation. These data indicate that PDGF-C promotes tumor growth via a growth promoting effect on HSC that is at least in part dependent on the presence of functional PAK-2.