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Decrease of calmodulin and actin in the plasma membrane of rat liver cells during proliferative activation.

C Pujades¹, R Bastos, C Enrich

¹Department of Cell Biology, Faculty of Medicine, University of Barcelona, Spain.

Biochemical and Biophysical Research Communications

|December 31, 1990

Summary

Following liver regeneration in rats, calmodulin and actin levels significantly decreased in liver cell plasma membranes. This suggests these proteins may move from the membrane to the cell nucleus during this process.

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Area of Science:

Cell Biology
Molecular Biology
Hepatology

Background:

Partial hepatectomy triggers proliferative activation in rat liver cells.
Plasma membrane proteins play crucial roles in cell signaling and structural integrity.
Calmodulin and actin are key regulatory proteins involved in cellular processes.

Purpose of the Study:

To investigate changes in calmodulin and actin levels within specific plasma membrane domains after partial hepatectomy.
To explore the potential translocation of these proteins to the nucleus following liver regeneration.

Main Methods:

Partial hepatectomy was performed on rats to induce liver regeneration.
Plasma membranes were isolated and fractionated into blood sinusoidal, canalicular, and lateral domains.

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Calmodulin and actin levels were quantified in these fractions at 24 hours post-surgery.

Main Results:

A significant decrease in calmodulin content was observed in all three plasma membrane domains 24 hours after partial hepatectomy.
Calmodulin levels dropped 3-fold in sinusoidal and lateral fractions and 2-fold in the canalicular fraction.
Actin levels also decreased in the plasma membrane fractions at 24 hours post-surgery.

Conclusions:

Partial hepatectomy leads to a reduction in calmodulin and actin associated with the liver cell plasma membrane.
The observed decrease suggests a potential redistribution of these proteins.
Results support the hypothesis that dissociated actin and calmodulin may translocate to the nucleus during liver regeneration.