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Active control and its stress effects
M V Kondashevskaya1, K A Nikol'skaya
1Group for Investigation of Functional Morphology of Stress, Institute of Human Morphology, Russian Academy of Medical Sciences. mariluka@mail.ru
Bulletin of Experimental Biology and Medicine
|January 22, 2005
Summary
Normal saline injections can induce stress in Wistar rats, significantly altering their behavior and increasing sensitivity. These effects highlight the importance of considering saline
Area of Science:
- Behavioral Neuroscience
- Animal Models
- Physiology
Background:
- Conditioned reflexes are crucial for understanding animal behavior.
- Stress significantly impacts physiological and behavioral responses.
- Normal saline is commonly used in research, but its potential stress effects are often overlooked.
Purpose of the Study:
- To investigate the behavioral and physiological effects of repeated normal saline injections in Wistar rats.
- To determine if normal saline administration acts as a stressor in animal models.
- To assess the impact of saline injections on conditioned reflexes.
Main Methods:
- Wistar rats were subjected to 5-fold injections of normal saline.
- Conditioned reflex tests included a tail-flick test (defense) and a multialternative maze (alimentary).
- Tactile sensitivity and response acquisition were measured.
Main Results:
- Normal saline injections induced a negative stress status in rats, characterized by heightened tactile sensitivity for 5 days.
- Conditioned pain avoidance reflex formation was observed in intact animals but significantly reduced in saline-treated rats.
- Food-procuring response in the maze was notably lower in experimental rats (15%) compared to controls (40%).
Conclusions:
- Repeated normal saline injections act as a significant negative stressor in Wistar rats.
- Saline-induced stress profoundly modulates animal behavior, affecting conditioned reflexes and learning.
- These findings necessitate careful consideration of normal saline's stress-inducing potential when interpreting results in pharmacological studies.