The dynamic attachment and detachment of cells to and from their extracellular milieu regulates cell motility and is critical for embryonic development, the inflammatory immune response, wound repair, and metastasis of cancerous cells. The overall goal of this project is to determine the global dynamics of cell contraction, focal adhesion disassembly, and cytoskeleton reorganization after detachment from a surface, and, in addition, to decipher the molecular mechanisms that drives and regulates this process. Our motivation is that the current state-of-the-art to study cell detachment involves bulk depolymerization and repolymerization of microtubules by nocadozole, a non-specific pharmacological approach that does not allow for spatially controlled release of focal adhesions at the sub-cellular level. The technological challenge is to develop a tool to study and control cell detachment that will allow release of focal adhesions over sub-cellular regions in a spatially and temporally controlled manner. In preliminary work we have demonstrated the feasibility of programmed sub-cellular release in addressing important questions related to cell detachment.

Public Health Relevance

Narrative Cell detachment is central to processes from migration to metastasis. The proposed research will develop a new tool to measure cell detachment and allow new insight into the molecular mechanisms that drive and regulate cell detachment, focal adhesion disassembly, and cytoskeleton reorganization.

Agency
National Institute of Health (NIH)
Institute
National Institute of Biomedical Imaging and Bioengineering (NIBIB)
Type
Exploratory/Developmental Grants (R21)
Project #
5R21EB008259-02
Application #
7908853
Study Section
Nanotechnology Study Section (NANO)
Program Officer
Hunziker, Rosemarie
Project Start
2009-08-10
Project End
2012-07-31
Budget Start
2010-08-01
Budget End
2012-07-31
Support Year
2
Fiscal Year
2010
Total Cost
$236,234
Indirect Cost
Name
Johns Hopkins University
Department
Engineering (All Types)
Type
Schools of Engineering
DUNS #
001910777
City
Baltimore
State
MD
Country
United States
Zip Code
21218
Huang, Yu-Ja; Samorajski, Justin; Kreimer, Rachel et al. (2013) The influence of electric field and confinement on cell motility. PLoS One 8:e59447
Ghaly, Tammer; Wildt, Bridget E; Searson, Peter C (2010) Electrochemical release of fluorescently labeled thiols from patterned gold surfaces. Langmuir 26:1420-3
Wildt, Bridget; Wirtz, Denis; Searson, Peter C (2010) Triggering cell detachment from patterned electrode arrays by programmed subcellular release. Nat Protoc 5:1273-80
Mali, Prashant; Wirtz, Denis; Searson, Peter C (2010) Interplay of RhoA and motility in the programmed spreading of daughter cells postmitosis. Biophys J 99:3526-34
Wildt, Bridget; Wirtz, Denis; Searson, Peter C (2009) Programmed subcellular release for studying the dynamics of cell detachment. Nat Methods 6:211-3