Preparation of Rat Skeletal Muscle Homogenates for Nitrate and Nitrite Measurements

Ji Won Park; Samantha M. Thomas; Lee J. Wylie; Andrew M. Jones; Anni Vanhatalo; Alan N. Schechter; Barbora Piknova

doi:10.3791/62427

Preparation of Rat Skeletal Muscle Homogenates for Nitrate and Nitrite Measurements

JoVE Journal
Biology

A subscription to JoVE is required to view this content. Sign in or start your free trial.

JoVE Journal Biology

Preparation of Rat Skeletal Muscle Homogenates for Nitrate and Nitrite Measurements

Full Text

2,799 Views

07:19 min

July 29, 2021

DOI: 10.3791/62427-v

Ji Won Park*¹, Samantha M. Thomas*¹, Lee J. Wylie², Andrew M. Jones², Anni Vanhatalo², Alan N. Schechter¹, Barbora Piknova¹

¹Molecular Medicine Branch, National Institute of Diabetes and Digestive and Kidney Diseases,National Institutes of Health, ²Sport and Health Sciences, College of Life and Environmental Sciences, St Luke’s Campus,University of Exeter

Overview

This study investigates the measurement of nitrate and nitrite levels in rat skeletal muscle tissue, which serve as sources of nitric oxide during exercise. Three homogenization methods are compared to evaluate their effectiveness in preserving these ions and the impact of different tissue weights on the results.

Key Study Components

Research Area

Muscle biology
Metabolic pathways
Analytical chemistry

Background

Nitrate and nitrite are crucial for nitric oxide production.
Skeletal muscle is a significant reservoir for these ions.
Understanding their levels can enhance knowledge of muscle physiology and exercise performance.

Methods Used

Homogenization techniques: rotary homogenizer, bead homogenizer, and pulverizer.
Rat skeletal muscle as the biological system.
Measurement of nitrite and nitrate levels using spectrophotometric methods.

Main Results

Homogenization methods yielded similar nitrate levels.
Pulverizer method produced significantly higher nitrite levels.
No significant difference was found in ion levels across various tissue weights.

Conclusions

The methodologies developed are effective for small samples.
Findings contribute to understanding the role of nitrates and nitrites in muscle function.

Frequently Asked Questions

What is the significance of measuring nitrate and nitrite levels in muscle?

These compounds are key for nitric oxide production, which plays a vital role in muscle physiology and exercise performance.

What methods were compared in this study?

Three methods were compared: rotary homogenizer, bead homogenizer, and pulverizer.

Did tissue sample size affect the results?

No significant differences in nitrate or nitrite levels were found between different sample sizes.

Which homogenization method proved to be the best for nitrite measurement?

The pulverizer method showed the highest nitrite levels compared to the other methods.

What implications do these findings have for future research?

The results can improve experimental designs focused on muscle metabolism and tissue analysis in exercise physiology.

Are the methods applicable to other tissues?

Yes, the protocols can be adapted for measuring nitrate and nitrite in other types of tissues.

We present protocols for three different methods for the homogenization of four different muscle groups of rat skeletal muscle tissue to measure and compare the levels of nitrate and nitrite. Furthermore, we compare different sample weights to investigate whether tissue sample size affects the results of homogenization.

Skeletal muscle serves as a major reservoir of nitrate which, after its conversion to nitrite, serves as a source of NO during exercise. Here we present methodology to measure these ions in muscle and other tissues. To begin, prepare the nitrate preserving or stop solution by combining 890 millimolar potassium ferricyanide and 118 millimolar n-methylmaleimide in distilled water, ensuring that no crystals remain in solution, then add a non-ionic surfactant in a 1-to-9 ratio and mix gently to avoid foaming.

Dilute the stop solution in a 1-to-9 ratio with distilled water and add the diluted stop solution to the homogenization tube. Next, thaw the previous isolated and frozen rat muscle tissue on ice. Once the tissue has thawed, remove the remaining fat and connective tissue from the skeletal muscle.

View the full transcript and gain access to thousands of scientific videos