Abstract
The skin is one of the most physiologically important organs where the organism comes into contact with the external environment and is often a site where pathogen entry first occurs. Thus, a better understanding of the specialized cellular behavior of the immune system in the skin may be important for the improved treatment of diseases. Here, we describe in detail a procedure to image the dorsal mouse ear skin, using a customized ear stage and its associated coverslip holder, with an upright multiphoton microscope. As a demonstrative example, we describe the specific protocol for visualizing robust neutrophil trafficking in albino lysozyme-EGFP mice in response to zymosan particles. Instructive sections are provided for the mouse ear preparation, intradermal delivery of zymosan, design and use of the custom ear stage, as well as a solution for the uninterrupted live imaging of mice during prolonged sessions within a dark box. The mouse ear is easily accessible for imaging, and unlike most other organs, does not require any invasive surgery to be performed.
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