Journal: International Journal of Nanomedicine
Article Title: An Immunoreceptor-Targeting Strategy with Minimalistic C3b Peptide Fusion Enhances SARS-CoV-2 RBD mRNA Vaccine Immunogenicity
doi: 10.2147/IJN.S463546
Figure Lengend Snippet: Confirmation of targeting proficiency for mC3 and mFc ligands via immunofluorescence assay (IFA). ( A ) Illustration of the ligands-receptors interactions that were demonstrated by IFA. Following mRNA transfection into 293T cells, receptors were incubated with the cells. Then, RBD-mC3 bound CR1 while RBD-mFc bound FcγR. The RBD-mC3 and RBD-mFc were labeled by anti-RBD monoclonal antibodies. The CR1 and FcγR were marked using anti-CR1 polyclonal antibodies and anti-FcγR monoclonal antibodies, respectively. ( B ) Antibodies targeting CR1 (FITC, green) and RBD-mC3 (Cy5, purple) depicted the respective distributions of CR1 and RBD-mC3. ( C ) Colocalization analysis of RBD-mC3 and CR1. ( D ) Antibodies against FcγR (green) and RBD-mFc (purple) showed the distributions of FcγR and RBD-mFc respectively. The blue color (DAPI) represented the cell nuclei. ( E ) Colocalization analysis of RBD-mFc and FcγR. Three regions of interest (ROI) were analyzed. Pearson’s coefficient (R) was calculated in colocalization analysis. R > 0.8 suggests a very strong correlation.
Article Snippet: Then, the cells were blocked with 10% goat serum (Jackson ImmunoResearch) for 1 hr at room temperature, followed by one-hour incubation of receptor proteins, including recombinant human CD35 protein (CR1) (R&D Systems #5748-CD-050, NE Minneapolis, MN) and mouse CD64/FCGR1 protein (Sino Biological #50086-M08H).
Techniques: Immunofluorescence, Transfection, Incubation, Labeling, Bioprocessing