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EGF increases TRPM6 activity and surface expression.

Stéphanie Thebault¹, R Todd Alexander, Wouter M Tiel Groenestege

¹Department of Physiology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, Netherlands.

Journal of the American Society of Nephrology : JASN

|December 17, 2008

Summary

This summary is machine-generated.

Epidermal growth factor (EGF) stimulates magnesium (Mg2+) transport by increasing the cell surface abundance of the TRPM6 channel. This process involves Src kinases and Rac1, crucial for magnesium homeostasis.

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Area of Science:

Molecular Biology
Cell Physiology
Biochemistry

Background:

Epidermal growth factor (EGF) is known to increase the activity of the epithelial magnesium channel, transient receptor potential M6 (TRPM6).
Mutations in the EGF gene causing hypomagnesemia highlight the importance of this interaction.
The precise molecular mechanisms underlying EGF's regulation of TRPM6 activity remain to be fully elucidated.

Purpose of the Study:

To investigate the molecular mechanism by which EGF enhances TRPM6 channel activity.
To determine the role of specific signaling pathways, including Src kinases and Rac1, in EGF-mediated TRPM6 regulation.
To understand how EGF affects TRPM6 trafficking and cell surface expression.

Main Methods:

Whole-cell patch-clamp recordings in HEK293 cells expressing TRPM6.
Assessment of TRPM6 mobility using fluorescence recovery after photobleaching (FRAP).
Utilized constitutively active and dominant-negative Rac1 mutants to probe signaling pathways.

Main Results:

EGF stimulation increased TRPM6 channel current but not TRPM7 current.
Activation of Src family tyrosine kinases and Rac1 was essential for EGF-induced TRPM6 activation.
Rac1 activation enhanced TRPM6 mobility and cell surface expression, leading to increased channel activity.

Conclusions:

EGF stimulates TRPM6 channel activity through a signaling cascade involving Src kinases and Rac1.
This pathway regulates TRPM6 by increasing its redistribution from endomembranes to the plasma membrane.
The findings provide insights into the regulation of transepithelial magnesium transport and whole-body magnesium homeostasis.