Fabrication of Microfluidic Devices for 3D Chemotaxis Studies

1. Fabrication of Microfluidic Devices for 3D Chemotaxis Studies Delaram Sahebzamani University of South Florida Mentor: Noo Li Jeon Department of Biomedical Engineering

2. Jeon Lab The lab’s focus is on applying microfluidics to biology. For the past few years they have concentrated on studying chemotaxis of metastatic breast cancer cells.

3. Chemotaxis • In chemotaxis cells exhibit directed movement in response to external concentration gradients. • By studying the migration of these breast cancer cells in precisely controlled gradients, one can gain further insights into processes that will eventually lead to better diagnosis and treatment.

4. The Next Step • All experiments done to this point have been 2 dimensional and the NEXT STEP is to develop devices to study migration 3D.

5. Why 3D?

6. The Answer • In various incidents cells migrate 3 dimensionally and it is important to create such environments. • The tissues and organs of the human body are abundant with Collagen. Therefore by using Collagen Type 1 within the microfluidic devices will allow us to mimic in vivo cells. • In vitro studies should mimic in vivo environment.

7. Fabrication Steps • Plasma the Device onto a Glass Slide • Inject Collagen solution into device through inlet • Suction from outlet and allow for polymerization to occur

8. Problems • The Texture • Pressure Flow

9. Examples of Bad Devices

10. Great Devices!

11. L W H Cell Density Experiments • 2 Cell Lines: MDA MB 231 & MTLn3 • 30,000 • 40,000 • 70,000 • 100,000

12. 30,000 Cells of MDA MB 231

13. 100,000 MDA MB 231 Cells Phase 10X

14. 40,000 MTLn3 Cells Phase 10X Fluorescence 10X

15. 70,000 MTLn3 Cells Phase 10X Fluorescence10x

16. 30,000 MTLn3 with Confocal Microscope 300 Microns, Every 10 Microns

17. 200 Microns every 5 Microns

18. Every 1 Micron on 1 Cell

19. Summary of Cell Density • Middle channels are 300 microns in depth and it was determined that 30,000 to 40,000 cells was approximately the right range to use for future experiments

20. Conclusion • 3D Microfluidic Device was in fact developed!!!!!!!!! • These new 3D devices will now be used for chemotaxis studies.

21. Acknowledgements • Mentor: Dr. Noo Li Jeon • Graduate Student: Wajeeh Saadi • Lab: Jeong Won Park , Anne Taylor, Bonggeun Chung, Kathleen O’ Hara, Babak Mosadegh, Madelyn Luttgen, Cyrus Roushan • IM SURE: Said Shokair, Jerry McMillan, Goran Matijasevic • National Science Foundation

22. Thank you!