Abstract
Our previous work shows that melanoma cells induce VE-cadherin disassembly possibly via binding of their VLA-4 receptors to VCAM-1 receptors on endothelial cells or secretion of chemokines. Interestingly enough we found during junction disassembly Rac/PAK molecules initially reside at endothelial junctions and then dissociate over time in response to VCAM-1 binding. However, other studies have also found that Rac/PAK interactions are mediated by chemokines, in particular, interleukin-8 (IL-8). Currently, studies have focused on the regulation of p38 MAPK via IL-8 and IL-1β signaling; however, the role of VCAM-1 in the regulation of p38 MAPK has not been elucidated. Using computational methods, we found that VCAM-1 binding increases PAK activation rates to augment p38 and VE-cadherin phosphorylation levels downstream. Furthermore, decreasing the PAK off rate resulted in a rapid increase in p38 and VE-cadherin phosphorylation.
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Acknowledgments
This study was supported by NIH CA-125707 and NSF CBET-0729091 (C.D.); and Penn State Institute for CyberScience Seed Grant (C.D.M. and C.D.). This work was supported by NIH-CA97306 and CA-125707 (C.D.) and Penn State Institute for CyberScience Seed Grant (C.D.M. and C.D.). We would like to thank Dr. Adam D. Hoppe for providing Rac-YFP and PBD-CFP plasmids.
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None of the listed authors have any financial or other interests with regard to the submitted manuscript that might be construed as a conflict of interest.
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Associate Editors John Shyy and Yingxiao Wang oversaw the review of this article.
Payal Khanna and Eric Weidert contributed equally to this work.
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Khanna, P., Weidert, E., Vital-Lopez, F. et al. Model Simulations Reveal VCAM-1 Augment PAK Activation Rates to Amplify p38 MAPK and VE-Cadherin Phosphorylation. Cel. Mol. Bioeng. 4, 656–669 (2011). https://doi.org/10.1007/s12195-011-0201-z
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DOI: https://doi.org/10.1007/s12195-011-0201-z