Complement Detection in Mouse Kidneys by Immunofluorescence.
2021
Immunofluorescence staining of tissues has become a reliable and informative technique used in a diverse set of applications, ranging from simple detection of an antigen of interest in a specific location to the semiquantitative analysis of spatial relationships between multiple antigens and/or cell types. During complement activation, circulating complement proteins are covalently fixed to target tissues, providing a durable marker of complement activation in the tissue, and many of these proteins can be readily detected by immunofluorescence microscopy. In general, staining for complement fragments is much like staining for other noncomplement epitopes. However, one key difference is the diligence with which unfixed tissues must be handled when staining for complement fragment. Here we explain the process of dual staining frozen mouse kidney sections for the complement proteins C3 and C4. Throughout the protocol, we will emphasize important steps for preserving complement protein integrity as well as tips to improve the signal-to-noise ratio to improve overall image quality.
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