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F-Actin-depolymerizing activity of human serum.

R Norberg, R Thorstensson, G Utter

European Journal of Biochemistry

|October 15, 1979

Summary

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Human and animal sera contain a heat-sensitive factor that depolymerizes actin filaments. This F-actin depolymerizing factor may prevent actin filaments from circulating in the bloodstream.

Area of Science:

Biochemistry
Cell Biology
Immunology

Background:

Actin is a crucial protein for cell structure and motility.
The presence of actin filaments in circulation could have pathological implications.

Purpose of the Study:

To identify and characterize a factor in serum that affects actin.
To elucidate the mechanism and physiological role of this actin-modulating factor.

Main Methods:

Indirect immunofluorescence assays using anti-actin antibodies.
Viscosity measurements of F-actin preparations.
Electron microscopy to observe F-actin depolymerization.
Enzyme sensitivity assays (heat, trypsin, reduction).
Calcium ion dependency studies.

Related Experiment Videos

Gel filtration (Sephadex G-200) and electrophoresis for factor characterization.

Main Results:

A heat-sensitive, trypsin-sensitive factor in non-heated sera inhibits anti-actin antibody staining.
This factor reduces F-actin viscosity, causes depolymerization of F-actin, and inhibits G-actin polymerization.
The factor exhibits enzymatic activity, is Ca2+ dependent, and functions optimally at physiological temperatures.
Molecular size is slightly larger than albumin, with electrophoretic mobility of gamma 2 globulin.

Conclusions:

A novel F-actin depolymerizing factor exists in human and animal sera.
This factor likely plays a physiological role in preventing circulating actin filaments.