An In Vitro Assay to Measure Antibody-Dependent Cellular Phagocytosis by Phagocytes
Abstract
Source: Powell, R. L., et al. Isolation of Leukocytes from Human Breast Milk for Use in an Antibody-dependent Cellular Phagocytosis Assay of HIV Targets. J. Vis. Exp. (2019).
This video demonstrates an assay to measure the antibody-dependent cellular phagocytosis (ADCP) by breast milk phagocytes. Fluorescently labeled microspheres conjugated to an antigen-antibody complex, are combined with a cell suspension isolated from breast milk to induce antibody-dependent cellular phagocytosis by the phagocytic leukocytes. Upon labeling the cells with antibodies against common leukocyte antigen (CD45), flow cytometry is used to measure the fluorescence intensity of microsphere-positive viable phagocytic leukocytes, indicating the level of ADCP activity.
Protocol
Representative Results
Disclosures
The authors have nothing to disclose.
Materials
| 1 µm FluoSpheres NeutrAvidin-Labeled Microspheres | Thermo Fisher | F8776 | |
| BD Pharmingen PE Mouse Anti-Human CD45 | BD | 560975 | |
| Bovine serum Albumin | MP Biomedicals | 8810025 | |
| Corning V-bottom polystyrene 96-well plate | Corning | 3894 | |
| Cytochalasin D | Sigma | 22144-77-0 | |
| EZ-Link NHS-LC-LC-Biotin kit | Thermo Fisher | 21338 | |
| Falcon 15mL Conical Centrifuge Tubes | Corning | 352196 | |
| Falcon 50mL Conical Centrifuge Tubes | Corning | 352070 | |
| Fixable Viability Stain 450 | BD | 562247 | |
| Formaldehyde solution | Sigma | 252549 | |
| HBSS without Calcium, Magnesium or Phenol Red | Life Technologies | 14175-095 | |
| Human BD Fc Block | BD | 564219 | |
| Human Serum Albumin | MP Biomedicals | 2191349 | |
| Kimtech Science Kimwipes Delicate Task Wipers | Kimberly-Clark Professional | 34120 | |
| PBS 1x pH 7.4 | Thermo Fisher | 10010023 | |
| Polystyrene 10mL Serological Pipettes | Corning | 4488 | |
| Protein Concentrators PES, 3K MWCO, 0.5 mL | Pierce | 88512 |
