title: Changes in apoptotic factors and caspase activation pathways during the postmortem aging of beef muscle.
abstract: The pathway of apoptosis (effector caspase activation) in beef muscle cells was investigated by examining the expression of apoptotic factors during postmortem (PM) storage of beef muscle. Results showed that caspase-3 could be activated in PM beef muscle. The expression of cytochrome c increased in the cytosolic fraction but significantly decreased in the mitochondrial fraction in the early PM period, which demonstrated that cytochrome c was released from mitochondrion to cytoplasm. The expression of the anti-apoptotic factor Bcl-2 did not show any visible change, and that of pro-apoptotic factor Bax increased during PM storage. Expression of the heat-shock protein Hsp27 significantly decreased with increased PM time. These results demonstrated that the mitochondrial pathway was one of the apoptosis pathways in PM beef muscle and that Bax and Hsp27 were two key regulation factors in apoptosis in PM beef muscle.
authors.affiliation: Institute of Agro-Products Processing Science and Technology, Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Huang
authors.affiliation: Key Laboratory of Meat Processing and Quality Control, Ministry of Education China, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Huang
authors.affiliation: Institute of Agro-Products Processing Science and Technology, Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Institute of Agro-Products Processing Science and Technology, Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, China.
authors.forename: Chunjiang
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Institute of Agro-Products Processing Science and Technology, Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, China.
authors.forename: Dequan
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Meat Processing and Quality Control, Ministry of Education China, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China. Electronic address: ghzhou@njau.edu.cn.
authors.forename: Guanghong
authors.initials: G
authors.lastname: Zhou
mesh_terms: D000375:Aging / Q000378:metabolism*; D000818:Animals; D017209:Apoptosis; D020169:Caspases / Q000737:chemistry*; D002417:Cattle; D000069466:Red Meat / Q000032:analysis*
chemical_list: D020169:Caspases
keywords: Aging; Apoptotic factors; Apoptotic pathway; Beef muscle; Caspase