IF Positive Hybridoma Screening Introduction

The immunofluorescence (IF) technology, also known as fluorescent antibody technology, is a powerful assay for detecting and identifying the subcellular distribution and migration of proteins and other molecules within cells and tissues. Creative Biolabs has a well-established hybridoma platform with unrivaled success and precision and can provide you with a scientific hybridoma screening service.

What Is Immunofluorescence?

Immunofluorescence techniques are based on the principle of antigen-antibody reactions. A known antigen or antibody is first labeled with fluorescein to make a fluorescent antibody, and this fluorescent antibody (or antigen) is then used as a probe to detect the corresponding antigen (or antibody) in the tissue or cell. The antigen-antibody complex formed in the tissue or cell contains the labeled fluorescein. When the specimen is observed using a fluorescence microscope, the fluorescein is irradiated by external excitation light, and a bright fluorescence (yellow-green or orange-red) occurs, and the tissue cell where the fluorescence is located can be seen, thus determining the nature and localization of the antigen or antibody as well as the content using quantitative techniques.

IF-Positive Hybridoma Screening

Since IF is available in both direct and indirect assays, when screening for IF-positive antibodies, we need to know the specific use of the target antibody. In general, direct detection involves the use of a fluorescent dye-coupled primary antibody, while indirect detection involves an unlabeled primary antibody followed by a fluorescent dye-coupled secondary antibody.

When performing IF-positive hybridoma screening, there are several general considerations.

First, antibodies that are suitable for IF-positive antibodies are generally also suitable for ICC or IHC. Therefore, during hybridoma screening, ICC-positive and IHC-positive hybridomas can be used in preference to IF-positive hybridoma screening to obtain rapid results.
Secondly, the specificity of the antibody is crucial to the results of the experiment and is particularly important when studying post-translational modifications or specific isoforms of proteins. It can generally be assessed in two ways: functional application validation and target specificity validation. Functional application validation can provide information about whether the antibody works in the stated application, while target specificity validation ensures that the antibody recognizes the target protein.
More than one protein can then be detected by multiplexing, while different fluorescent dye-labeled antibodies can be combined in a multiplex ICC/IHC. Multiplexing allows target co-localization studies to be performed. Therefore, primary antibodies from different species must be used to prevent secondary antibody cross-reactivity and improve specificity.
In addition, both monoclonal and polyclonal antibodies can be used for immunofluorescence detection. Both have their advantages and disadvantages, and the key requirement for selection is to expose the specific epitope of interest. In specific practice, both methods should be evaluated according to the study protocol before choosing the appropriate one. One advantage of using monoclonal antibodies is that they are generally more specific. However, this is associated with a higher likelihood that an epitope recognized by the monoclonal antibody will be buried. Unless monoclonal antibodies are specifically screened or designed for IF, polyclonal antibodies would be a good choice for recognizing target proteins. Polyclonal antibodies can recognize multiple epitopes of a target. However, they are more likely to be cross-reactive.

Creative Biolabs' hybridoma platform for antibody development has an unparalleled success rate and accuracy, thanks to our strong knowledge in the field of hybridoma. We would like to share our knowledge of hybridoma in order to safeguard your research.

All listed services and products are For Research Use Only. Do Not use in any diagnostic or therapeutic applications.

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