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Failure to detect changes in sarcolemma permeability in amphibian muscle following severe cellular damage
C J Duncan1, C L Osborne, J J Parsons
1Department of Zoology, University of Liverpool, UK.
Abstract:
1. Isolated amphibian hearts and pectoris cutaneous muscles were exposed either to DNP or to caffeine, thereby producing severe myofilament damage. 2. No accompanying change in sarcolemma permeability was detected by monitoring either CK or LDH release or Procion yellow entry in the heart, or by Procion entry in amphibian skeletal muscle. 3. The findings are in contrast with mammalian cardiac and skeletal muscles, and confirm that the pathways leading to myofilament degradation and to the breakdown in sarcolemma organization are separate.
Insights
DNP and caffeine caused severe damage to amphibian muscle myofilaments. However, sarcolemma permeability remained unchanged, indicating separate degradation pathways in amphibian cardiac and skeletal muscles.
Area of Science:
- Muscle physiology
- Cellular biology
- Biochemistry
Background:
- Myofilament damage can occur through various cellular insults.
- Sarcolemma integrity is crucial for muscle function.
- Understanding the relationship between myofilament damage and sarcolemma permeability is important.
Purpose of the Study:
- To investigate the effects of DNP and caffeine on amphibian muscle.
- To determine if myofilament damage affects sarcolemma permeability in amphibians.
- To compare these findings with mammalian muscle responses.
Main Methods:
- Isolated amphibian hearts and pectoralis cutaneous muscles were used.
- Exposure to DNP (2,4-dinitrophenol) or caffeine was administered.
- Sarcolemma permeability was assessed by monitoring CK and LDH release and Procion yellow entry.
Main Results:
- Severe myofilament damage was observed in response to DNP and caffeine.
- No significant changes in sarcolemma permeability were detected in amphibian cardiac or skeletal muscle.
- CK, LDH release, and Procion yellow entry remained unaltered.
Conclusions:
- Myofilament degradation and sarcolemma breakdown are distinct processes in amphibian muscles.
- The pathways leading to myofilament damage are separate from those affecting sarcolemma integrity.
- Findings contrast with observations in mammalian cardiac and skeletal muscles.