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Comparative analysis of ACTH and corticosterone sampling methods in rats
Torsten P Vahl1, Yvonne M Ulrich-Lai, Michelle M Ostrander
1Dept. of Internal Medicine, Division of Endocrinology and Metabolism, Univ. of Cincinnati, 2170 E Galbraith Rd., Bldg. 43, Rm. 315, Cincinnati, OH 45237, USA. torsten.vahl@uc.edu
Summary
Choosing the right blood collection method is crucial for accurate rodent stress hormone measurement. Rapid tail vein sampling (<3 min) or indwelling catheters are suitable for ACTH and corticosterone (Cort) studies, avoiding anesthesia-induced stress.
Area of Science:
- Animal Science
- Endocrinology
- Neuroscience
Background:
- Accurate measurement of stress hormones like ACTH and corticosterone (Cort) in rodents is vital for research.
- Debate exists regarding the optimal blood collection method to minimize animal stress and avoid confounding results.
Purpose of the Study:
- To compare plasma ACTH and Cort concentrations using different blood collection methods in rats.
- To evaluate the impact of anesthesia on stress hormone levels.
Main Methods:
- Compared blood samples from indwelling vena cava catheters, tail vein nicks, and tail clips.
- Assessed plasma ACTH and Cort levels before and after restraint stress.
- Compared trunk blood samples obtained by decapitation with and without anesthesia (CO2 or pentobarbital sodium).
Main Results:
- Indwelling catheters showed lower prestress ACTH than tail vein nicks if sampling time was not limited.
- Rapid tail vein sampling (<3 min) and tail clipping did not elevate basal ACTH.
- Restraint stress did not alter ACTH and Cort responses based on sampling method.
- Anesthesia (CO2 or pentobarbital sodium) before decapitation significantly increased plasma ACTH levels.
Conclusions:
- Tail vein nicking, tail clipping, or indwelling venous catheters are suitable for ACTH and Cort measurement during acute stress.
- Rapid sampling (<3 min) is essential for tail vein methods to avoid stress response initiation.
- Anesthesia prior to trunk blood collection confounds ACTH measurements, making it unsuitable for stress studies.