Immunogold staining with silver enhancement is a versatile, sensitive and specific method for immunodetection of diverse protein antigens separated by sodium dodecyl sulfate polyacrylamide gel electrophoresis and transferred to nitrocellulose or polyvinylidene difluoride membranes. "Next-generation" antibodies tagged with nanogold particles have a wide scope of use including but not limited to immunohistochemistry, western blotting, electron microscopy, fluorescent activated cell sorting procedures, and cell isolation and migration studies. Herein, we describe the use of a nanogold-tagged anti-mouse IgG secondary antibody and silver enhancement methodologies coupled with antigen-specific unlabeled primary antibodies for the detection of the La/SS-B autoantigen by western blotting as a useful alternative to chemiluminescent and enzymatic detection methods.
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