Related Experiment Videos
Cellular model for induction of drip loss in meat
I H Lambert1, J H Nielsen, H J Andersen
1Biochemical Department, The August Krogh Institute, Universitetsparken 13, DK-2100 Copenhagen, Denmark. ihlambert@aki.ku.dk
Journal of Agricultural and Food Chemistry
|October 16, 2001
Summary
Drip loss in pork is caused by the release of intramuscular components like taurine. Stress conditions, such as anoxia and acidification, trigger this release through two distinct pathways involving 5-lipooxygenase or reactive oxygen species.
Area of Science:
- Meat Science
- Cell Biology
- Biochemistry
Background:
- Drip loss in porcine muscle involves the release of intracellular components, including potassium and organic osmolytes like taurine.
- Understanding the cellular mechanisms behind drip loss is crucial for improving meat quality.
Purpose of the Study:
- To investigate the cellular events leading to the release of osmolytes and subsequent drip loss in porcine muscle.
- To elucidate the mechanisms of taurine release from muscle cells under simulated stress conditions.
Main Methods:
- C2C12 myotubes and primary porcine muscle cells were subjected to anoxia and acidification to mimic slaughter conditions.
- Cells were exposed to hypotonic shock or lysophosphatidylcholine (LPC) to induce taurine release.
- The role of ion channels, 5-lipooxygenase, and reactive oxygen species in taurine efflux was examined using specific inhibitors and antioxidants.
Main Results:
- Anoxia and acidification increased intracellular calcium concentration ([Ca(2+)](i)) primarily through sarcolemmal Na(+) channels.
- Swelling-induced taurine release was inhibited by anion channel blockers and 5-lipooxygenase inhibitors.
- Lysophosphatidylcholine-induced taurine release was abolished by antioxidants, indicating a role for reactive oxygen species.
Conclusions:
- Stress-induced taurine release from muscle cells occurs via at least two distinct mechanisms: one dependent on 5-lipooxygenase activity and another involving reactive oxygen species generation.
- These findings provide a cellular model for understanding the biochemical events preceding drip loss in meat.