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Comparative Brain Proteomic Analysis between Sham and Cerebral Ischemia Experimental Groups
María Candamo-Lourido1, Antonio Dopico-López1, Esteban López-Arias1
1Translational Stroke Laboratory Group (TREAT), Clinical Neurosciences Research Laboratory (LINC), Health Research Institute of Santiago de Compostela (IDIS), 15706 Santiago de Compostela, Spain.
Abstract:
Sham control groups are essential in experimental animal studies to reduce the influence of surgical intervention. The intraluminal filament procedure is one of the most common models of middle cerebral artery occlusion (MCAO) used in the study of brain ischemia. However, a sham group is usually not included in the experimental design of these studies. In this study, we aimed to evaluate the relevance of the sham group by analyzing and comparing the brain protein profiles of the sham and MCAO groups. In the sham group, 98 dysregulated proteins were detected, compared to 171 in the ischemic group. Moreover, a comparative study of protein profiles revealed the existence of a pool of 57 proteins that appeared to be dysregulated in both sham and ischemic animals. These results indicated that the surgical procedure required for the intraluminal occlusion of the middle cerebral artery (MCA) induces changes in brain protein expression that are not associated with ischemic lesions. This study highlights the importance of including sham control groups in the experimental design, to ensure that surgical intervention does not affect the therapeutic target under study.
Insights
Including sham control groups in animal studies is crucial. Surgical procedures for middle cerebral artery occlusion (MCAO) in brain ischemia research alter protein profiles, independent of ischemic lesions.
Area of Science:
- Neuroscience
- Proteomics
- Animal Models
Background:
- Sham control groups are vital in experimental animal studies to isolate the effects of interventions.
- The intraluminal filament model of middle cerebral artery occlusion (MCAO) is widely used for brain ischemia research.
- Experimental designs often omit sham groups, potentially confounding results.
Purpose of the Study:
- To investigate the necessity and impact of sham control groups in MCAO models.
- To compare brain protein profiles between sham and MCAO groups.
- To determine if surgical procedures alone induce significant protein expression changes.
Main Methods:
- Analysis of brain protein profiles using proteomics.
- Comparison of protein expression patterns between sham-operated and MCAO-induced ischemic animals.
- Statistical analysis to identify dysregulated proteins in both groups.
Main Results:
- 98 proteins were found to be dysregulated in the sham group.
- 171 proteins were dysregulated in the MCAO group.
- 57 proteins were commonly dysregulated in both sham and MCAO groups, indicating procedure-induced changes.
Conclusions:
- The surgical procedure for MCAO significantly alters brain protein expression, irrespective of ischemic damage.
- Sham control groups are essential to differentiate between procedure-related effects and true ischemic effects.
- Implementing sham controls ensures the validity and accuracy of findings in brain ischemia research.
