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Hepatic autophagy and intracellular ATP. A morphometric study.
J P Schellens1, H Vreeling-Sindelárová, P J Plomp
1Laboratory of Histology and Cell Biology, University of Amsterdam, The Netherlands.
Experimental Cell Research
|July 1, 1988
Summary
Adenosine triphosphate (ATP) depletion significantly impacts liver macroautophagy. Reduced ATP levels markedly decrease autophagic vacuoles, suggesting ATP affects early stages of this cellular process.
Area of Science:
- Cell Biology
- Biochemistry
- Hepatology
Background:
- Macroautophagy is a crucial cellular process for maintaining liver homeostasis.
- Adenosine triphosphate (ATP) is vital for cellular energy and function.
- The precise role of ATP levels in regulating macroautophagy in hepatocytes requires further elucidation.
Purpose of the Study:
- To investigate the sensitivity of liver macroautophagy to changes in intracellular ATP levels.
- To quantify the impact of partial ATP depletion on the autophagic/lysosomal system in rat hepatocytes.
Main Methods:
- Isolated rat hepatocytes were incubated under conditions of partial intracellular ATP depletion.
- The volume density of autophagic vacuoles and dense bodies was analyzed using stereological methods.
- ATP concentrations were measured to confirm partial depletion.
Main Results:
- A 30-50% reduction in intracellular ATP concentration led to a 70% decrease in the volume density of autophagic vacuoles.
- Partial ATP depletion did not significantly alter the volume density of dense bodies.
- These findings align with previous studies showing reduced proteolysis rates at lower ATP concentrations.
Conclusions:
- Intracellular ATP levels critically influence the early steps of the macroautophagy pathway in liver cells.
- The autophagic/lysosomal system's sensitivity to ATP suggests a regulatory role in cellular degradation processes.
- Further research into ATP-dependent regulation of autophagy can inform therapeutic strategies for liver diseases.