Related Experiment Video
Updated: Jun 1, 2026
10:05
Rodent Brain Microinjection to Study Molecular Substrates of Motivated Behavior
Published on: September 16, 2015
Stress-free microinjections in conscious rats
Dmitry V Zaretsky1, Maria V Zaretskaia, Daniel E Rusyniak
1Department of Emergency Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA. dzaretsk@iupui.edu
Journal of Neuroscience Methods
|May 24, 2011
Summary
This study presents a refined microinjection technique for conscious rats, minimizing animal stress and physiological artifacts. The novel method ensures reproducible nanoliter injections, crucial for accurate neuroscience research.
Area of Science:
- Neuroscience
- Animal Physiology
Background:
- Microinjections are vital in neuroscience but traditional methods cause stress in conscious rodents.
- Disruption during microinjection leads to physiological artifacts like tachycardia and hyperthermia.
Purpose of the Study:
- To develop and validate a modified microinjection technique for conscious rats.
- To minimize animal stress and reduce unwanted physiological artifacts during microinjections.
Main Methods:
- A novel technique using a long, narrow-bore tubing allowed pre-placement of the injection system.
- This approach eliminated the need for repeated insertion and removal of the microinjector during experiments.
- The method was tested for reproducibility with 100 nL drug injections in conscious rats.
Main Results:
- The modified technique significantly reduced disturbances to the animals.
- Cardiovascular function was monitored to assess the effects and reproducibility of the injections.
- Examples demonstrating the technique's efficacy and reliability are provided.
Conclusions:
- The refined microinjection technique minimizes stress and artifacts in conscious rats.
- This method enhances the reliability of neuroscience research involving microinjections.
- The technique is suitable for delivering precise nanoliter volumes in physiological studies.
