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[Effect of morphine in vitro on the oxidative phosphorylation in rat liver mitochondria]
Abstract:
The rates of respiration in the presence of ADP and of phosphorylation as an ATP-ase activity of rat liver mitochondria was inhibited was in vitro by morphine with Ki=6.5 mM. The uncoupler-stimulated respiration of the mitochondria and the activity of ATP-ase and synthesis of ATP in the submitochondrial particles were not altered in the presence of morphine. It is suggested that morphine inhibited the adenine nucleotide transport through the mitochondrial membrane
Insights
Morphine inhibits mitochondrial respiration and ATP synthesis in rat liver by blocking adenine nucleotide transport. This specific inhibition suggests a targeted mechanism of action for morphine within cellular energy production.
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Context:
- Mitochondria are crucial for cellular energy production.
- Morphine is an opioid analgesic with known cellular effects.
- Understanding morphine's impact on mitochondrial function is key to its pharmacology.
Purpose:
- To investigate the effect of morphine on mitochondrial respiration and ATP synthesis.
- To determine the specific mechanism by which morphine affects these processes.
- To elucidate the role of adenine nucleotide transport in morphine's action.
Summary:
- Morphine inhibited ADP-stimulated respiration and phosphorylation in rat liver mitochondria in vitro (Ki=6.5 mM).
- Uncoupler-stimulated respiration and ATP-ase/ATP synthesis in submitochondrial particles were unaffected by morphine.
- These findings suggest morphine specifically inhibits adenine nucleotide transport across the mitochondrial membrane.
Impact:
- Provides novel insights into the molecular targets of morphine.
- Suggests a potential mechanism for morphine-induced cellular dysfunction.
- Opens avenues for developing targeted therapies or understanding side effects.