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A Forgotten Principle in Immunocytochemistry: Optimal Dilution
Bertalan Dudás1, Malcolm Lane2, Nikitha Mupparaju2
1Neuroendocrine Organization Laboratory, Lake Erie College of Osteopathic Medicine, Erie, Pennsylvania and Department of Anatomy, Histology and Embryology, University of Szeged, Szeged, Hungary.
Insights
Optimizing antibody dilutions in immunocytochemistry (ICC) is crucial for specific and cost-effective research. Testing antibody dilutions ensures accurate staining and reduces experimental expenses.
Area of Science:
- Neuroscience
- Biochemistry
- Immunology
Background:
- Immunocytochemical (ICC) techniques are vital in biological and clinical research.
- Ensuring antibody specificity and cost-effectiveness requires optimal antibody dilutions.
- Many researchers do not independently validate antibody dilutions, relying on external data.
Purpose of the Study:
- To highlight the importance of determining optimal antibody dilutions for ICC.
- To demonstrate the impact of antibody dilution on staining specificity and cost.
- To advocate for the routine practice of dilution curve testing in ICC.
Main Methods:
- Utilized peroxidase-based ICC on mouse and guinea pig brain sections.
- Examined ICC staining for phospho-S129 alpha-synuclein in A53T mice.
- Assessed ICC staining for NeuN in guinea pig brains using monoclonal antibodies.
Main Results:
- Demonstrated that optimal ICC staining can be achieved at significantly higher antibody dilutions (2-3 orders of magnitude) than commonly reported.
- Showcased specific staining patterns at optimized dilutions.
- Illustrated the economic benefits of using higher antibody dilutions.
Conclusions:
- Independent validation of antibody dilutions via dilution curves is essential for reliable ICC results.
- Optimized antibody dilutions enhance specificity and reduce reagent costs.
- Implementing dilution curve testing should be standard practice in all laboratories using ICC.
Abstract:
Immunocytochemical (ICC) techniques are frequently used in basic and clinical research. Here, we focus on the importance of using antisera/antibodies at optimal dilutions to achieve specificity and reduce costs. Unfortunately, the basic principle, the necessity to test method specificity of the staining by a series of increasing dilutions of primary antiserum/antibodies, is only occasionally seen in papers using ICC. Many researchers rely on the company's information or others' published data. In this study, we show examples with monoclonal antibodies used in the peroxidase-based ICC technique in mouse and guinea pig brain sections. We show images of ICC staining of phospho-S129 alpha-synuclein in A53T mice and NeuN in guinea pig brains and demonstrate that optimal staining with them can be achieved at least at two to three orders of magnitude higher dilutions than generally used in the literature. We strongly recommend that when antisera/antibodies are used for the first time in any laboratory, independent of what the manufacturer or vendor recommends or are found in the literature, a dilution curve should be set up to identify the optimal dilution. This practice provides not only the highest specificity but is also an economic approach.
