Source: Yang, K., et al. An All-on-chip Method for Rapid Neutrophil Chemotaxis Analysis Directly from a Drop of Blood. J. Vis. Exp. (124), (2017)
This video demonstrates neutrophil chemotaxis assay using an all-on-chip method. The method allows direct isolation of neutrophils from the whole blood by immunomagnetic negative selection followed by chemotaxis assay on a microfluidic chip.
All procedures involving sample collection have been performed in accordance with the institute's IRB guidelines.
1. Microfluidic device preparation.
2. All-on-chip Chemotaxis Assay Operation
3. Chemotaxis assay (Figure 1C).
4. Cell Migration Data Analysis (Figure 1C)
Figure 1: Illustration of the all-on-chip method for neutrophil chemotaxis analysis. (A) Illustration of the microfluidic device. The device includes two layers. The first layer (4 µm high) defines the cell docking barrier channel to trap the cells beside the gradient channel. The second layer (60 µm high) defines the gradient generating channel, the port and channel for cell loading, the chemical inlet reservoirs, and the waste outlet. Alignment marks are designed for the two layers. For the second layer, the length and width of the upstream serpentine input channel are 60 mm and 200 µm, respectively; the length and width of the downstream serpentine input channel are 6 mm and 280 µm, respectively; (B) Illustration of the all-on-chip cell isolation method; (C) Illustration of the chemotaxis test.
The authors have nothing to disclose.
Device fabrication | |||
Mask aligner | ABM | N/A | |
Spinner | Solitec | 5000 | |
Hotplate | VWR | 11301-022 | |
Plasma cleaner | Harrick Plasma | PDC-001 | |
Vacuum dessicator | Fisher Scientific | 08-594-15A | |
SU-8 2000 thinner | Microchem | SU-8 2000 | |
SU-8 2025 photoresist | Microchem | SU-8 2025 | |
(tridecafluoro-1,1,2,2- tetrahydrooctyl) trichlorosilane | Gelest | 78560-45-9 | |
Si wafer | Silicon, Inc | LG2065 | |
Glass slides | Fisher Scientific | 12-544-4 | |
Cutting pad | N/A | N/A | Custom-made |
Punchers | |||
On-chip cell isolation and chemotaxis assay | |||
RPMI 1640 | Fisher Scientific | SH3025502 | |
DPBS | Fisher Scientific | SH3002802 | |
Bovine serum albumin (BSA) | Sigma-Aldrich | SH3057402 | |
Fibronectin | VWR | CACB356008 | |
fMLP | Sigma-Aldrich | F3506-10MG | |
Magnetic disks | Indigo Instruments | 44202-1 | 5 mm in diameter, 1 mm thick |
FITC-Dextran | Sigma-Aldrich | FD10S | |
Rhodamine | Sigma-Aldrich | R4127-5G | |
Giemsa stain solution | Rowley Biochemical Inc | G-472-1-8OZ | |
EasySep Direct Human Neutrophil Isolation Kit | STEMCELL Technologies Inc | 19666 | |
Dithiothreitol | Sigma-Aldrich | D0632 | |
Nikon Ti-U inverted fluorescent microscope | Nikon | Ti-U | |
Microscope environmental chamber. | InVivo Scientific | N/A | |
CCD camera | Nikon | DS-Fi1 |