The specificity, sensitivity and biostability of cy-apt 20 in detecting gastric cancer were assessed by binding assay, cell fluorescence imaging, and in vivo tumor imaging in animal model in comparison with non-gastric cancers.
The success of immuno-fluorescence often depends on conditions like fixation and permeabilization, antibody binding, and cell type (Katikireddy and O'Sullivan, 2011).
We confirmed specific binding using whole-cell fluorescence by flow cytometry.
A low level of nonspecific staining was visible in neuronal processes, possibly due to nonspecific binding of the secondary antibody or intrinsic cell fluorescence, but the intensities of the nonspecific binding were clearly less than those observed with primary antibody (see Fig. 1).
Perfusion of caffeine in addition to MRS5424 blocked most of the cell fluorescence, indicating that MRS5424 and caffeine competed for the same binding site on the receptor.
Using an antibody to the extracellular portion of Neogenin that does not block ligand binding [24] and fluorescence activated cell sorting (FACS), dissociated E11.5, P0 and adult SVZ NS were sorted according to their Neogenin expression, resulting in a Neogenin-high and a Neogenin-low/negative population (Figure 5A, B).
Furthermore, their DNA binding properties, fluorescence imaging and cell cycle were investigated.
Its biological properties with DNA binding, cell toxicity, cell binding and intracellular distribution were tested by agarose gel electrophoresis assay, flow cytometry, and fluorescence microscope and laser scanning confocal microscope.
SiR-Zn features nanomolar affinity for Zn2+, a 15-fold increase in fluorescence upon Zn2+ binding, and is functional in cells.
After conjugation to either glu-HSA or hGSA, substantial quenching of fluorescence occurs that is reversed after cell binding and internalization.
