Journal
EXPERIMENTAL CELL RESEARCH
Volume 310, Issue 2, Pages 282-292Publisher
ELSEVIER INC
DOI: 10.1016/j.yexcr.2005.07.028
Keywords
beta(2) integrins; ICAM-1; CXCR1/2; interleukin-8; extravasation
Categories
Funding
- NCI NIH HHS [R01 CA097306-03, CA-97306, R01 CA097306, R01 CA097306-01A1, R01 CA097306-02] Funding Source: Medline
- NCRR NIH HHS [M01 RR010732, C06 RR016499, M01-RR-010732, C06-RR-016499] Funding Source: Medline
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Previous studies have shown that neutropbils (PMNs) facilitate melanoma cell extravasation [M.J. Slattery, C. Dong, Neutrophils influence melanoma adhesion and migration under flow conditions, Intl. J. Cancer 106 (2003) 713-722] Little is known, however, about the specific interactions between PMNs, melanoma and the endothelium (EC) or the molecular mechanism involved under flow conditions. The aim of this study is to investigate a two-step adhesion hypothesis that involves initial PMN tethering on the EC and subsequent melanoma cells being captured by tethered PMNs. Different effects of hydrodynamic shear stress and shear rate were analyzed using a parallel-plate flow chamber. Results indicate a novel finding that PNIN-facilitated melanoma cell arrest on the EC is modulated by shear rate, which is inversely-proportional to cell-cell contact time, rather than by the shear stress, which is proportional to the force exerted on formed bonds. beta(2) integrins/ICAM-1 adhesion mechanisms were examined and the results indicate LFA-1 and Mac-1 cooperate to mediate the PMN-EC-melanoma interactions under shear conditions. In addition, endogenously produced IL-8 contributes to PMN-facilitated melanoma arrest on the EC through the CXC chemokine receptors 1 and 2 (CXCR1 and CXCR2) on PMN. These results provide new evidence for the complex role of hemodynamic forces, secreted chemokines and PMN-melanoma adhesion in the recruitment of metastatic cancer cells to the EC. (c) 2005 Elsevier Inc. All rights reserved.
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