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International Journal of Cell Biology
Volume 2012, Article ID 259142, 7 pages
http://dx.doi.org/10.1155/2012/259142
Research Article

Treatment with Y-27632, a ROCK Inhibitor, Increases the Proinvasive Nature of SW620 Cells on 3D Collagen Type 1 Matrix

1Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60612, USA
2Department of Medicine, University of Florida, P.O. Box 100214, Gainesville, FL 32610, USA
3Department of Biomedical Engineering, University of Florida, Gainesville, FL 32610, USA
4Department of Electrical and Computer Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA

Received 19 January 2012; Accepted 28 March 2012

Academic Editor: Michael Cho

Copyright © 2012 Ramana Vishnubhotla et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The concept of using tissue density as a mechanism to diagnose a tumor has been around for centuries. However, this concept has not been sufficiently explored in a laboratory setting. Therefore, in this paper, we observed the effects of cell density and extracellular matrix (ECM) density on colon cancer invasion and proliferation using SW620 cells. We also attempted to inhibit ROCK-I to determine its effect on cell invasion and proliferation using standard molecular biology techniques and advanced imaging. Increasing cell seeding density resulted in a 2-fold increase in cell invasion as well as cell proliferation independent of treatment with Y-27632. Increasing collagen I scaffold density resulted in a 2.5-fold increase in cell proliferation while treatment with Y-27632 attenuated this effect although 1.5 fold increase in cell invasion was observed in ROCK inhibited samples. Intriguingly, ROCK inhibition also resulted in a 3.5-fold increase in cell invasion within 3D collagen scaffolds for cells seeded at lower densities. We show in this paper that ROCK-I inhibition leads to increased invasion within 3D collagen I microenvironments. This data suggests that although ROCK inhibitors have been used clinically to treat several medical conditions, its effect largely depends on the surrounding microenvironment.