Platelets Increase the Proliferation of Ovarian Cancer Cells

Overview

Journal Blood

Publisher Elsevier

Specialty Hematology

Date 2012 Sep 12

PMID 22966171

Citations 125

Authors

Min Soon Cho

Justin Bottsford-Miller

Hernan G Vasquez

Rebecca Stone

Behrouz Zand

Michael H Kroll

Anil K Sood

Vahid Afshar-Kharghan

Affiliations

Soon will be listed here.

Abstract

Platelets promote metastasis and angiogenesis, but their effect on tumor cell growth is uncertain. Here we report a direct proliferative effect of platelets on cancer cells both in vitro and in vivo. Incubation of platelets with ovarian cancer cells from murine (ID8 and 2C6) or human (SKOV3 and OVCAR5) origin increased cell proliferation. The proliferative effect of platelets was not dependent on direct contact with cancer cells, and preincubation of platelets with blocking antibodies against platelet adhesion molecules did not alter their effect on cancer cells. The proliferative effect of platelets was reduced by fixing platelets with paraformaldehyde, preincubating platelets with a TGF-β1-blocking antibody, or reducing expression of TGF-βR1 receptor on cancer cells with siRNA. Infusing platelets into mice with orthotopic ovarian tumors significantly increased the proliferation indices in these tumors. Ovarian cancer patients with thrombocytosis had higher tumor proliferation indices compared with patients with normal platelet counts.

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