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Glutamate transport and renal function.

T C Welbourne¹, J C Matthews

¹Department of Molecular Physiology, Louisiana State University Medical Center, Shreveport, Louisiana 71130, USA. twelbo@lsunc.edu

The American Journal of Physiology

|October 12, 1999

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Brush border enzymes and the EAAC1 transporter generate extracellular glutamate in kidney tubules. This signals changes in cell metabolism, permeability, and urine acidity, with GLT1 playing distinct roles.

Area of Science:

Nephrology
Molecular Biology
Biochemistry

Background:

The kidney proximal tubule plays a crucial role in regulating solute and water balance.
Glutamate transport and metabolism are vital for various physiological processes within the kidney.
Understanding the specific roles of different glutamate transporters is essential for comprehending kidney function.

Purpose of the Study:

To investigate the functional unit of brush border gamma-glutamyltransferase-glutaminase and the EAAC1 transporter in proximal tubules.
To elucidate the role of extracellular glutamate generated by this unit in modulating intracellular metabolism and kidney function.
To explore the implications of the presence of GLT1 on the antiluminal surface.

Main Methods:

Biochemical assays to measure gamma-glutamyltransferase-glutaminase activity.

Related Experiment Videos

Functional studies of the EAAC1 glutamate transporter in kidney proximal tubule cells.

Analysis of intracellular glutamine/glutamate metabolism.

Assessment of paracellular permeability and urinary acidification.

Main Results:

Brush border gamma-glutamyltransferase-glutaminase activity and EAAC1 transporter function collaboratively.
This unit generates and transports extracellular glutamate into proximal tubules.
Extracellular glutamate acts as a signal influencing intracellular glutamine/glutamate metabolism, paracellular permeability, and urinary acidification.
GLT1 is present on the antiluminal tubule surface, suggesting specialized functions.

Conclusions:

The coordinated action of brush border enzymes and EAAC1 is critical for regulating proximal tubule physiology.
Extracellular glutamate serves as a key signaling molecule in the kidney.
Distinct roles for EAAC1 and GLT1 in kidney function and disease are proposed.