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Amyloid beta protein precursor is a mitogen.

D Schubert¹, G Cole, T Saitoh

¹Salk Institute for Biological Studies, San Diego, California 92138.

Biochemical and Biophysical Research Communications

|July 14, 1989

Summary

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The secreted amyloid beta-protein precursor with a protease inhibitor sequence stimulates cell growth in Swiss 3T3 cells. The precursor lacking this domain does not exhibit mitogenic effects.

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Amyloid beta-protein precursor (APP) is implicated in various cellular processes.
The role of specific APP domains in cellular signaling is not fully understood.
Protease inhibitor domains are known to modulate protein function.

Purpose of the Study:

To investigate the mitogenic activity of different forms of the secreted amyloid beta-protein precursor.
To determine the role of the protease inhibitor domain in APP-mediated cell proliferation.

Main Methods:

Utilized Swiss 3T3 cells as a model system.
Administered purified secreted amyloid beta-protein precursor with and without the protease inhibitor domain.
Measured DNA synthesis as an indicator of mitogenesis.

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Main Results:

The secreted amyloid beta-protein precursor containing the protease inhibitor sequence demonstrated significant mitogenic activity.
A ten-fold stimulation of DNA synthesis was observed at a protein concentration of 8 x 10(-9) M.
The amyloid beta-protein precursor lacking the protease inhibitor domain showed no mitogenic effect.

Conclusions:

The protease inhibitor domain of the secreted amyloid beta-protein precursor is essential for its mitogenic activity.
This finding highlights a specific functional role for the protease inhibitor domain in cell proliferation.
Secreted APP with its protease inhibitor domain may play a role in regulating cell growth.