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Methadone induced lysis of mammalian cells
Abstract:
Methadone induced lysis of human erythrocytes and mouse leukemic cells was studied. The cells lyse without prior swelling that is a necessary step of colloid osmotic lysis. Methadone is accumulated by both cell types, and is widely distributed intracellurly in mouse leukemic cells. The maximum lytic rate is roughly proportional to the amount of methadone uptake and the Q10 for lysis is equal to the Q10 for methadone partitioning between octanol and water. It is concluded that the cells lyse as a result of a non-specific disruption of the plasma membrane.
Insights
Methadone causes human red blood cells and mouse leukemia cells to break apart without swelling. This cell lysis results from methadone disrupting the cell membrane, not osmotic pressure.
Area of Science:
- Pharmacology
- Cell Biology
- Biochemistry
Background:
- Methadone is an opioid agonist used for pain relief and opioid use disorder treatment.
- Understanding drug-induced cellular effects is crucial for patient safety and drug development.
- Erythrocytes (red blood cells) and leukemic cells offer distinct models for studying drug toxicity.
Purpose of the Study:
- To investigate the mechanism by which methadone induces cell lysis in human erythrocytes and mouse leukemic cells.
- To determine if methadone-induced lysis follows the pathway of colloid osmotic lysis.
- To explore the relationship between methadone uptake, distribution, and its lytic effects.
Main Methods:
- Incubation of human erythrocytes and mouse leukemic cells with methadone.
- Observation of cell morphology and lysis.
- Measurement of methadone accumulation within cells.
- Analysis of lysis rate in relation to methadone concentration and temperature (Q10).
Main Results:
- Methadone induced lysis of both cell types without preceding cell swelling.
- Methadone was actively accumulated and widely distributed within mouse leukemic cells.
- The rate of cell lysis correlated with the extent of methadone uptake.
- The temperature dependence (Q10) of lysis mirrored that of methadone partitioning, suggesting a membrane interaction.
Conclusions:
- Methadone causes non-specific disruption of the plasma membrane, leading to cell lysis.
- The observed lysis mechanism differs from colloid osmotic lysis, which requires prior cell swelling.
- Methadone's lipophilic nature and accumulation contribute to its membrane-disrupting effects.