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Substance P-immunoreactive nerves in the rat kidney.
D S Knight1, J A Beal, Z P Yuan
1Department of Anatomy, Louisiana State University School of Medicine, Shreveport 71130.
Journal of the Autonomic Nervous System
|December 1, 1987
Summary
Researchers visualized substance P-immunoreactive (SPI) nerves in the rat kidney using immunohistochemistry. They found dense SPI nerve networks innervating the renal calyx and arteries, suggesting roles in pain and blood pressure regulation.
Area of Science:
- Nephrology
- Neuroscience
- Histology
Background:
- Substance P (SP) is a neuropeptide involved in pain and inflammation.
- The innervation of the kidney by SP-containing nerves is not fully understood.
- Understanding renal innervation is crucial for managing kidney function and disease.
Purpose of the Study:
- To visualize and characterize the distribution of substance P-immunoreactive (SPI) nerves in the rat kidney.
- To identify the specific structures within the kidney that are innervated by SPI nerves.
- To infer the potential physiological roles of these nerves.
Main Methods:
- Indirect immunohistochemistry using an avidin-biotinylated horseradish peroxidase complex.
- Perfusion fixation of rat kidneys with paraformaldehyde and picric acid.
- Vibratome sectioning and incubation with primary antiserum for SPI nerves.
Main Results:
- A dense plexus of SPI nerves was observed innervating the rat renal calyx.
- SPI axons were found to innervate interlobular arteries, afferent arterioles, interlobar arteries, and arcuate arteries.
- The densest SPI nerve plexuses were located on interlobar arteries near the renal hilus.
Conclusions:
- The rat kidney exhibits a rich innervation by substance P-containing nerves.
- These SPI nerves likely play roles in nociception, chemoreception, or baroreception within the kidney.
- Further research is needed to elucidate the precise functions of renal SPI innervation.