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Sciatic nerve transection decrease substance P immunoreactivity in the lumbosacral spinal cord of the frog (Rana

Wania A Partata¹, Josi F Cerveira, Léder L Xavier

¹Departamento de Fisiologia, Laboratório de Neurobiologia Comparada, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite, 500, 90050-170, RS, Porto Alegre, Brazil. achaval@ufrgs.br

Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology

|March 30, 2002

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This study shows that substance P (SP) levels in frog spinal cords decrease after sciatic nerve injury but recover over time. Frogs serve as a valuable model for understanding nerve injury and pain.

Area of Science:

Neuroscience
Animal Models
Pain Research

Background:

Substance P (SP) is a neuropeptide involved in pain signaling.
Peripheral nerve injury can alter neuropeptide expression in the spinal cord.

Purpose of the Study:

To investigate the expression of SP in the frog spinal cord following sciatic nerve transection.
To evaluate the frog as a model for studying the effects of peripheral axotomy on SP.

Main Methods:

Immunohistochemistry and optical densitometry were used to quantify SP.
Sciatic nerve transection was performed on Rana catesbeiana.
SP levels were analyzed at various time points post-axotomy.

Main Results:

A significant decrease in SP-immunoreactive fibers was observed in the Lissauer's tract ipsilateral to the sciatic nerve lesion.

Related Experiment Videos

These changes persisted for up to 15 days post-axotomy.

SP expression returned to control levels by 20 days, indicating recovery.

Conclusions:

The frog spinal cord exhibits dynamic changes in SP expression following peripheral nerve injury.
Rana catesbeiana is a suitable model for investigating the role of SP in neuropathic pain.
This research contributes to understanding SP's function in pain pathways after nerve damage.