I use casein zymography of stomach tissue but could't get the expression of calpain.
Don't know if you already got an answer or the right protocol, as your questions is not the latest one, but have you checked some typical publications working with calpains and zymography (see the links)?
http://www.ncbi.nlm.nih.gov/pubmed/7771786
http://www.ncbi.nlm.nih.gov/pubmed/10818754
http://www.ncbi.nlm.nih.gov/pubmed/18559257
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