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Mesodermalization of amphibian gastrula ectoderm in transfilter experiments

Medical Biology

|December 1, 1978

Summary

A mesodermal inducing substance can pass through Nuclepore filters, demonstrating its ability to induce tissue differentiation. The extent of this mesodermal differentiation is influenced by the specific cells, inducing agents, and filter pore sizes used in the experiment.

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Area of Science:

Developmental Biology
Cell Biology
Embryology

Background:

Understanding embryonic development requires identifying the signaling molecules that direct cell fate.
Transfilter experiments are crucial for studying cell-cell communication and induction during embryogenesis.

Purpose of the Study:

To investigate the permeability of a mesodermal inducing substance through Nuclepore filters of varying pore sizes.
To determine the factors influencing the degree of mesodermal differentiation in transfilter experiments.

Main Methods:

Transfilter experiments utilizing gastrula ectoderm from Triturus vulgaris and Ambystoma mexicanum.
Employing blastoporal lip, alcohol-treated bone marrow, and archenteron roof as inducing materials.
Utilizing Nuclepore filters with pore sizes of 3.0, 1.0, 0.4, and 0.2 micrometers.

Main Results:

A mesodermal inducing substance was demonstrated to penetrate Nuclepore filters across all tested pore sizes.
The degree of mesodermal differentiation varied based on the reacting ectoderm, the specific inductor used, and the filter pore size.

Conclusions:

The mesodermal inducing substance possesses a molecular size that allows passage through filters down to 0.2 micrometers.
Cellular differentiation is a complex process influenced by the interaction between inducing signals, responding cells, and physical barriers.

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