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[Control of mitochondrial Mg++-efflux]
Acta Biologica Et Medica Germanica
|January 1, 1978
Summary
Inorganic phosphate triggers magnesium release from liver mitochondria, impacting cell metabolism. This process influences mitochondrial membrane permeability to cations like magnesium and calcium.
Area of Science:
- Mitochondrial Physiology
- Cellular Metabolism
- Ion Transport
Context:
- Mitochondria play a crucial role in cellular energy production and homeostasis.
- The regulation of intramitochondrial ion concentrations, particularly magnesium (Mg++), is vital for mitochondrial function.
Purpose:
- To investigate the effect of inorganic phosphate on magnesium efflux from liver mitochondria.
- To elucidate the mechanisms and influencing factors involved in phosphate-stimulated Mg++ release.
Summary:
- Inorganic phosphate stimulates Mg++ release from liver mitochondria in a concentration-dependent manner, requiring electron transport.
- This Mg++ release precedes delayed calcium (Ca++) efflux and mitochondrial swelling, and is modulated by EGTA, exogenous Ca++, ADP, ATP, phosphoenol pyruvate, and fatty acids.
- The findings indicate that inorganic phosphate and cellular metabolites control Mg++ distribution and mitochondrial inner membrane permeability.
Impact:
- Provides insights into the regulation of mitochondrial ion homeostasis.
- Highlights the role of inorganic phosphate in modulating mitochondrial membrane permeability.
- Offers potential targets for understanding and treating metabolic disorders linked to mitochondrial dysfunction.