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Renal autoregulation in P2X1 knockout mice
E W Inscho1, A K Cook, J D Imig
1Department of Physiology, Medical College of Georgia, Augusta, GA 30912-3000, USA.
Acta Physiologica Scandinavica
|July 31, 2004
Summary
The P2X(1) receptor, not adenosine, is crucial for transmitting tubuloglomerular feedback (TGF) signals. This finding clarifies renal blood flow autoregulation mechanisms by identifying key signalling pathways in the kidney.
Area of Science:
- Physiology
- Renal Physiology
- Molecular Biology
Background:
- Renal blood flow autoregulation is vital for kidney function.
- Signalling mechanisms for tubuloglomerular feedback (TGF) remain unclear.
- Two hypotheses exist: adenosine and P2 receptor signalling.
Purpose of the Study:
- To elucidate the signalling mechanisms of TGF in renal blood flow autoregulation.
- To determine the role of P2X(1) receptors versus adenosine A(1) receptors in TGF.
Main Methods:
- Investigated P2X(1) receptor function in mice.
- Utilized P2X(1) receptor knockout mice.
- Assessed renal autoregulation responses after papillectomy or furosemide treatment.
Main Results:
- P2X(1) receptor inactivation impairs autoregulation.
- TGF-mediated vasoconstriction is abolished in P2X(1) knockout mice.
- Adenosine A(1) receptor responses remain intact in knockout mice.
Conclusions:
- P2X(1) receptors are essential for TGF-mediated afferent arteriolar vasoconstriction.
- Adenosine signalling is not the primary mechanism for TGF transmission.
- This clarifies the molecular basis of renal autoregulation.
