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Defective forebrain development in mice lacking gp330/megalin

T E Willnow¹, J Hilpert, S A Armstrong

¹Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas 75235, USA.

Proceedings of the National Academy of Sciences of the United States of America

|August 6, 1996

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GP330/megalin, a receptor involved in macromolecule uptake, is crucial for neuroepithelium development. Its absence in knockout mice leads to severe brain and respiratory defects, suggesting a role in nutrient transport during fetal development.

Area of Science:

Molecular biology
Developmental biology
Cell biology

Background:

GP330/megalin is a low-density lipoprotein (LDL) receptor family member.
It is expressed on the apical surfaces of epithelial tissues, including the neuroepithelium.
Megalin mediates the endocytic uptake of macromolecules like lipoproteins.

Purpose of the Study:

To investigate the role of GP330/megalin in neuroepithelial development.
To explore the function of megalin in maternal-fetal nutrient transport.

Main Methods:

Utilizing megalin knockout mouse models.
Analyzing phenotypic abnormalities in lung, kidney, and brain development.
Investigating the association between megalin, lipoproteins, and cholesterol supply.

Related Experiment Videos

Main Results:

Megalin knockout mice exhibit abnormalities in epithelial tissues and perinatal death due to respiratory insufficiency.
Impaired neuroepithelial proliferation in knockout mice results in holoprosencephalic syndrome.
Holoprosencephalic syndrome in humans and animals is linked to insufficient developmental cholesterol supply.

Conclusions:

Megalin plays a critical role in neuroepithelial development and overall embryonic survival.
The receptor is likely involved in the maternal-fetal lipoprotein transport system.
Megalin mediates the endocytic uptake of essential nutrients during the postgastrulation stage.