Inhibition of platelet GPVI induces intratumor hemorrhage and increases efficacy of chemotherapy in mice
| Autor: | Lydia Sorokin, Alma Zernecke, Süleyman Ergün, Scott I. Abrams, Rajender Nandigama, Jesus Gil-Pulido, Julia Volz, Bernhard Nieswandt, Katharina A. Remer, Elmina Mammadova-Bach, Erik Henke |
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| Rok vydání: | 2018 |
| Předmět: |
Necrosis
medicine.medical_treatment Immunology Hemorrhage Platelet Membrane Glycoproteins Biochemistry Neovascularization chemistry.chemical_compound Immunoglobulin Fab Fragments Mice medicine Animals Platelet Mice Knockout Chemotherapy Neovascularization Pathologic business.industry Cell Biology Hematology Neoplasms Experimental Mice Inbred C57BL Paclitaxel chemistry Tumor progression Hemostasis Cancer research Female GPVI medicine.symptom business BLOOD Commentary |
| Zdroj: | Blood. 133(25) |
| ISSN: | 1528-0020 |
| Popis: | Maintenance of tumor vasculature integrity is indispensable for tumor growth and thus affects tumor progression. Previous studies have identified platelets as major regulators of tumor vascular integrity, as their depletion selectively rendered tumor vessels highly permeable and caused massive intratumoral hemorrhage. While these results established platelets as potential targets for antitumor therapy, their depletion is not a treatment option due to their essential role in hemostasis. Thus, a detailed understanding of how platelets safeguard vascular integrity in tumors is urgently demanded. Here, we show for the first time that functional inhibition of glycoprotein VI (GPVI) on the platelet surface with an antibody (JAQ1) F(ab)2 fragment rapidly induces tumor hemorrhage and diminishes tumor growth similar to complete platelet depletion while not inducing systemic bleeding complications. The intratumor bleeding and tumor growth arrest could be reverted by depletion of Ly6G+ cells, confirming them to be responsible for the induction of bleeding and necrosis within the tumor. In addition, JAQ1 F(ab)2–mediated GPVI inhibition increased intratumoral accumulation of coadministered chemotherapeutic agents, such as Doxil and paclitaxel, thereby resulting in a profound antitumor effect. In summary, our findings identify platelet GPVI as a key regulator of vascular integrity specifically in growing tumors and could serve as a basis for the development of antitumor strategies based on the interference with platelet function. |
| Databáze: | OpenAIRE |
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