Mouse-on-Mouse Cross-Reactivity in Tissue Staining

Symptom

High background when using mouse primary antibodies on mouse tissue, caused by secondary antibody binding to endogenous mouse immunoglobulins and Fc receptors rather than only the primary antibody.

1. 1 Secondary antibody binding to endogenous mouse immunoglobulins in tissue
2. 2 Secondary antibody binding to mouse Fc receptors
3. 3 Cross-reactivity between anti-mouse secondary and tissue immunoglobulins
4. 4 Lack of specialized blocking for mouse-on-mouse applications

1. 1 Follow a Mouse-on-Mouse (MOM) staining protocol with specialized blocking reagents
2. 2 Use MOM blocking kit to prevent secondary antibody binding to endogenous mouse IgG
3. 3 Consider using primary antibodies from different species (e.g., rabbit anti-target)
4. 4 Implement Fc receptor blocking step before primary antibody incubation

Related Video (3)

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Immunohistochemistry on Paraffin-Embedded Sections (CST Demo)

"CST's step-by-step IHC protocol on paraffin sections is the closest to the context where mouse-on-mouse secondary cross-reactivity arises, showing the full staining workflow."

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Immunohistochemistry Experiment (IHC) Protocol

"Hands-on IHC benchwork walkthrough lets researchers see the primary/secondary antibody incubation steps where endogenous mouse Ig/Fc receptor background occurs."

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Complete IHC Immunohistochemistry Protocol for Beginners

"Comprehensive beginner IHC protocol covering sample prep to mounting, useful for understanding the full experimental context of the failure."