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Tubuloglomerular feedback: new concepts and developments

J Schnermann¹, T Traynor, T Yang

¹Department of Physiology, University of Michigan, Ann Arbor 48109-0622, USA. jbsch@umich.edu

Kidney International. Supplement

|September 15, 1998

Summary

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Tubuloglomerular feedback (TGF) stabilizes salt delivery, but adapts to long-term changes by regulating renin secretion. The renin-angiotensin system is crucial for this TGF signaling pathway.

Area of Science:

Nephrology
Physiology
Renal Physiology

Background:

Macula densa (MD) luminal NaCl influences glomerular arteriolar resistance via tubuloglomerular feedback (TGF) and renin secretion.
TGF stabilizes distal salt delivery against short-term fluctuations.
Chronic MD NaCl changes shift MD function towards renin secretion control.

Purpose of the Study:

To investigate the mechanisms of TGF adaptation to chronic changes in MD NaCl.
To elucidate the role of the renin-angiotensin system in TGF signaling.

Main Methods:

Studies in transgenic mice with targeted gene disruptions.
Analysis of TGF responses in mice lacking functional AT1A or angiotensin-converting enzyme genes.
Assessment of TGF responses in nitric oxide synthase I knockout mice.

Related Experiment Videos

Main Results:

TGF adaptation allows glomerular filtration rate adjustments during chronic MD NaCl perturbations.
TGF adaptation is linked to angiotensin II generation.
TGF responses were abolished in mice lacking functional AT1A or ACE genes.
TGF responses were unaffected in nitric oxide synthase I knockout mice.

Conclusions:

The renin-angiotensin system is essential for the TGF signaling pathway.
TGF adaptation is a critical mechanism for maintaining renal homeostasis under chronic conditions.