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- Title
Presence of intratumoral platelets is associated with tumor vessel structure and metastasis.
- Authors
Rong Li; Meiping Ren; Ni Chen; Mao Luo; Xin Deng; Jiyi Xia; Guang Yu; Jinbo Liu; Bing He; Xu Zhang; Zhuo Zhang; Xiao Zhang; Bing Ran; Jianbo Wu
- Abstract
Background: Platelets play a fundamental role in maintaining hemostasis and have been shown to participate in hematogenous dissemination of tumor cells. Abundant platelets were detected in the tumor microenvironment outside of the blood vessel, thus, platelet -tumor cell interaction outside of the bloodstream may play a role in regulating primary tumor growth and metastasis initiation. However, it is unclear that platelet depletion affects tumor vessel structure and dynamics. Methods: Using thrombocytopenia induction in two different tumor-bearing mouse models, tumor tissues were performed by Westernblotting and immunohistochemical staining. Vascular permeability was evaluated by determination of intratumoral Evans blue and Miles vascular permeability assay. Furthermore, microdialysis was used to examining the intratumoral extracellular angiogenic growth factors (VEGF, TGF-ß) by ELISA. Results: Platelet depletion showed no change in tumor growth and reduced lung metastasis. Platelet depletion led to reduced tumor hypoxia and Met receptor activation and was associated with a decreased release of MMP-2, 9, PAI-1, VEGF, and TGF-ß. Tumor vessels in platelet-depleted mice showed impaired vessel density and maturation. Conclusions: Our findings demonstrate that platelets within the primary tumor microenvironment play a critical role in the induction of vascular permeability and initiation of tumor metastasis.
- Subjects
BLOOD platelets; TUMOR blood vessels; METASTASIS; TUMOR growth; THROMBOCYTOPENIA; IMMUNOHISTOCHEMISTRY; WESTERN immunoblotting
- Publication
BMC Cancer, 2014, Vol 14, Issue 1, p1
- ISSN
1471-2407
- Publication type
Article
- DOI
10.1186/1471-2407-14-167