bone marrow suppression by c-kit blockade enhances tumor growth of colorectal metastases through the action of stromal cell-derived factor-1
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2012
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Abstract
Background. Mobilization of c-Kit+ hematopoietic cells (HCs) contributes to tumor vascularization. Whereas survival and proliferation of HCs are regulated by binding of the stem cell factor to its receptor c-Kit, migration of HCs is directed by stromal cell-derived factor (SDF)-1. Therefore, targeting migration of HCs provides a promising new strategy of anti-tumor therapy. Methods. BALB/c mice (𝑛=16) were pretreated with an anti-c-Kit antibody followed by implantation of CT26.WT-GFP colorectal cancer cells into dorsal skinfold chambers. Animals (𝑛=8) additionally received a neutralizing anti-SDF-1 antibody. Animals (𝑛=8) treated with a control antibody served as controls. Investigations were performed using intravital fluorescence microscopy, immunohistochemistry, flow cytometry and western blot analysis. Results. Blockade of c-Kit significantly enhanced tumor cell engraftment compared to controls due to stimulation of tumor cell proliferation and invasion without markedly affecting tumor vascularization. C-Kit blockade significantly increased VEGF and CXCR4 expression within the growing tumors. Neutralization of SDF-1 completely antagonized this anti-c-Kit-associated tumor growth by suppression of tumor neovascularization, inhibition of tumor cell proliferation and reduction of muscular infiltration. Conclusion. Our study indicates that bone marrow suppression via anti-c-Kit pretreatment enhances tumor cell engraftment of colorectal metastases due to interaction with the SDF-1/CXCR4 pathway which is involved in HC-mediated tumor angiogenesis.
| Reference Key |
rupertus2012journalbone
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|---|---|
| Authors | ;Kathrin Rupertus;Gudrun C. Y. Haberl;Claudia Scheuer;Michael D. Menger;Martin K. Schilling;Otto Kollmar |
| Journal | joule |
| Year | 2012 |
| DOI |
10.1155/2012/196957
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| URL | |
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