Platelets and metastasis revisited: a novel fatty link - PubMed (original) (raw)
Review
Platelets and metastasis revisited: a novel fatty link
Gaorav P Gupta et al. J Clin Invest. 2004 Dec.
Abstract
Platelets have long been suspected of having a role in cancer progression and metastasis that has largely been attributed to platelet-mediated enhancement of tumor cell survival, extravasation, and angiogenesis. A study in this issue of the JCI suggests that platelet-derived lysophosphatidic acid is coopted by aggressive breast and ovarian cancer cells as a tumor cell mitogen and promoter of osteolysis during bone metastasis.
Figures
Figure 1
Platelets facilitate metastasis through multiple mechanisms. (A) Tumor cells induce platelet aggregation and embolus formation, which can enhance survival in the stressful milieu of the circulation. This includes protection from immune-mediated clearance (I) and from shear stresses that are toxic to tumor cells (II). (B) Platelets also form complexes with leukocytes and facilitate adhesion to endothelial cells (III). It is hypothesized that this adhesive cellular aggregate is competent to extravasate into the secondary site of metastasis. Numerous platelet-derived factors enhance angiogenesis (IV), growth, and tissue-specific modulation of the new microenvironment. One of these factors is LPA, which acts as a direct tumor cell mitogen (V) and as an enhancer of osteolysis through induction of IL-6 and IL-8 by cancer cells in the bone marrow (VI).
Comment on
- Platelet-derived lysophosphatidic acid supports the progression of osteolytic bone metastases in breast cancer.
Boucharaba A, Serre CM, Grès S, Saulnier-Blache JS, Bordet JC, Guglielmi J, Clézardin P, Peyruchaud O. Boucharaba A, et al. J Clin Invest. 2004 Dec;114(12):1714-25. doi: 10.1172/JCI22123. J Clin Invest. 2004. PMID: 15599396 Free PMC article.
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