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Updated: Feb 12, 2026

Measuring Calpain Activity in Fixed and Living Cells by Flow Cytometry
Published on: July 8, 2010
Regulation of calpain-1 activity and protein proteolysis by protein nitrosylation in postmortem beef
Chaoyang Zhang1, Rui Liu1, Anran Wang1
1Key Laboratory of Meat Processing and Quality Control, Ministry of Education China, Jiangsu Collaborative Innovation Center of Meat Production and Processing, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China.
Abstract:
The effects of nitric oxide (NO) and its induced protein nitrosylation on calpain-1 activation and protein proteolysis in beef during postmortem aging were investigated. Five semimembranosus muscles were removed from beef cattle carcass. Beef samples were incubated with one of following treatments for 24 h at 4 °C: control (normal saline), NO donor (100, 200 and 400 μM S-nitrosoglutathione (GSNO)) or nitric oxide synthase (NOS) inhibitor (0.05, 0.1 and 0.15 M Nω-Nitro-l-arginine methyl ester hydrochloride (L-NAME)). After incubation, the beef samples were vacuum-packaged and aged at 4 °C for 1, 4, and 7 days. Results showed that GSNO decreased and L-NAME increased the extent of calpain-1 autolysis at d 1. Degradation of desmin and troponin-T was increased by L-NAME while decreased by GSNO. These results suggest that NO could regulate calpain-1 autolysis and its proteolysis activity during postmortem aging in beef SM muscle.
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