Comparison of Activity, Expression, and S-Nitrosylation of Calcium Transfer Proteins between Pale, Soft, and Exudative and Red, Firm, and Non-exudative Pork during Post-Mortem Aging
2019
Wang, Yingying | Liu, Rui | Tian, Xiaona | Fan, Xiaoquan | Shi, Yingwu | Zhang, Wangang | Hou, Qin | Zhou, Guanghong
The research was performed to investigate the difference of activity, expression, and S-nitrosylation of calcium transfer proteins between pale, soft, and exudative (PSE) and red, firm, and non-exudative (RFN) pork. Seven PSE and seven RFN pork longissimus thoracis (LT) muscles were chosen according to pH and L* at 1 h post-mortem and identified by drip loss at 24 h. The nitric oxide synthase (NOS) activity and neuronal nitric oxide synthase (nNOS) expression showed a significant difference between two groups (p < 0.05). PSE meat had a considerably higher sarcoplasmic calcium concentration compared to RFN meat at 1 h post-mortem aging (p < 0.05). In PSE meat, the expression of ryanodine receptor 1 (RyR1) and sarcoplasmic reticulum calcium ATPase 1 (SERCA1) was lower than that in RFN meat, while the relative S-nitrosylation level of RyR1 and SERCA1 was higher (p < 0.05). In addition, a lower activity of SERCA was detected in PSE meat compared to RFN meat (p < 0.05). Those results indicate that S-nitrosylation of RyR1 and SERCA1 can putatively play a crucial part in regulating calcium homeostasis. A high level of RyR1 and SERCA1 S-nitrosylation can induce the imbalance of calcium in cytoplasm, leading to accelerated pH decline and the development of PSE meat.
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