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Precise docking sites for cells

Date:
December 11, 2013
Source:
Karlsruhe Institute of Technology
Summary:
The Petri dish is a classical biological laboratory device, but it is no ideal living environment for many types of cells. Studies lose validity, as cell behavior on a flat plastic surface differs from that in branched lung tissue, for example. Researchers have now presented a method to make three-dimensional structures attractive or repellent for certain types of cells.

The Petri dish is a classical biological laboratory device, but it is no ideal living environment for many types of cells. Studies lose validity, as cell behavior on a flat plastic surface differs from that in branched lung tissue, for example. Researchers of Karlsruhe Institute of Technology have now presented a method to make three-dimensional structures attractive or repellent for certain types of cells.

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"Now, we can rapidly and precisely design the ideal Petri dish for single cells," Barner-Kowollik explains. Barner-Kowollik's and Martin Bastmeyer's team of chemists and biologists at KIT developed a new photochemical surface coding method. It allows for the precise modification of three-dimensional microscaffolds. "Customized structuring of adhesion points for cells allows for studying the behavior of individual cells in a close-to-reality environment," Bastmeyer says.

The Petri dish resembles a miniaturized ropes course. Its size is one fiftieth of a millimeter at the maximum. Isolated cells can be hung up between traverses and observed without any disturbing impacts. By an appropriate coating of traverses and poles, the cells are kept at the desired place and, if necessary, stimulated to grow. "In this way, we can study the motion and force of individual cells," Bastmeyer points out.

To construct and coat the Petri dish with nanometer resolution, the cell researchers and polymer chemists use a direct laser writing method. Originally, this method was developed by the team of Martin Wegener from KIT for use in nanooptics. The three-dimensional scaffold forms at the points of intersection of two laser beams in a photoresist. At these points, the resist is hardened. For coating the scaffold, the team of Barner-Kowollik and Martin Bastmeyer uses various bioactive molecules and a photoactive group. Coupling is activated at the points illuminated by the laser beam only. There, bioactive molecules bind chemically to the surface. The physico-chemical properties and parameters, such as the flexibility or three-dimensional arrangement of cell docking sites, can be adjusted with a high local resolution when using these modern photochemical methods.

A whole set of photochemical surface coding methods is now presented by six publications in the latest issues of the magazines Angewandte Chemie, Chemical Science, and Advanced Materials. Using this set of methods, chemical bonds can be produced efficiently and in a locally controlled manner without catalysts or increased temperatures being required. Depending on the application, it is possible to maximize coupling efficiency, to accelerate the photoreaction, to directly couple to unmodified biomarkers, to reduce chemical synthesis work, or to design areas where no cell adhesion can take place.

"Now, we can rapidly and precisely design the ideal Petri dish for single cells," Barner-Kowollik explains. Barner-Kowollik's and Martin Bastmeyer's team of chemists and biologists at KIT developed a new photochemical surface coding method. It allows for the precise modification of three-dimensional microscaffolds. "Customized structuring of adhesion points for cells allows for studying the behavior of individual cells in a close-to-reality environment," Bastmeyer says. The Petri dish resembles a miniaturized ropes course. Its size is one fiftieth of a millimeter at the maximum. Isolated cells can be hung up between traverses and observed without any disturbing impacts. By an appropriate coating of traverses and poles, the cells are kept at the desired place and, if necessary, stimulated to grow. "In this way, we can study the motion and force of individual cells," Bastmeyer points out.

To construct and coat the Petri dish with nanometer resolution, the cell researchers and polymer chemists use a direct laser writing method. Originally, this method was developed by the team of Martin Wegener from KIT for use in nanooptics. The three-dimensional scaffold forms at the points of intersection of two laser beams in a photoresist. At these points, the resist is hardened. For coating the scaffold, the team of Barner-Kowollik and Martin Bastmeyer uses various bioactive molecules and a photoactive group. Coupling is activated at the points illuminated by the laser beam only. There, bioactive molecules bind chemically to the surface. The physico-chemical properties and parameters, such as the flexibility or three-dimensional arrangement of cell docking sites, can be adjusted with a high local resolution when using these modern photochemical methods.

A whole set of photochemical surface coding methods is now presented by six publications in the latest issues of the magazines Angewandte Chemie, Chemical Science, and Advanced Materials. Using this set of methods, chemical bonds can be produced efficiently and in a locally controlled manner without catalysts or increased temperatures being required. Depending on the application, it is possible to maximize coupling efficiency, to accelerate the photoreaction, to directly couple to unmodified biomarkers, to reduce chemical synthesis work, or to design areas where no cell adhesion can take place.


Story Source:

The above story is based on materials provided by Karlsruhe Institute of Technology. Note: Materials may be edited for content and length.


Journal References:

  1. Cesar Rodriguez-Emmenegger, Corinna M. Preuss, Basit Yameen, Ognen Pop-Georgievski, Michael Bachmann, Jan O. Mueller, Michael Bruns, Anja S. Goldmann, Martin Bastmeyer, Christopher Barner-Kowollik. Controlled Cell Adhesion on Poly(dopamine) Interfaces Photopatterned with Non-Fouling Brushes. Advanced Materials, 2013; 25 (42): 6123 DOI: 10.1002/adma.201302492
  2. Benjamin Richter, Thomas Pauloehrl, Johannes Kaschke, Dagmar Fichtner, Joachim Fischer, Alexandra M. Greiner, Doris Wedlich, Martin Wegener, Guillaume Delaittre, Christopher Barner-Kowollik, Martin Bastmeyer. Three-Dimensional Microscaffolds Exhibiting Spatially Resolved Surface Chemistry. Advanced Materials, 2013; 25 (42): 6117 DOI: 10.1002/adma.201302678

Cite This Page:

Karlsruhe Institute of Technology. "Precise docking sites for cells." ScienceDaily. ScienceDaily, 11 December 2013. <www.sciencedaily.com/releases/2013/12/131211093730.htm>.
Karlsruhe Institute of Technology. (2013, December 11). Precise docking sites for cells. ScienceDaily. Retrieved December 18, 2014 from www.sciencedaily.com/releases/2013/12/131211093730.htm
Karlsruhe Institute of Technology. "Precise docking sites for cells." ScienceDaily. www.sciencedaily.com/releases/2013/12/131211093730.htm (accessed December 18, 2014).

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