Internal capsule stroke in the common marmoset

White matter (WM) impairment and motor deficit after stroke are directly related. However, WM injury mechanisms and their relation to motor disturbances are still poorly understood. In humans, the anterior choroidal artery (AChA) irrigates the internal capsule (IC), and stroke to this region can induce isolated motor impairment. The goal of this study was to analyze whether AChA occlusion can injure the IC in the marmoset monkey. The vascular distribution of the marmoset brain was examined by colored latex perfusion and revealed high resemblance to the human brain anatomy. Next, a new approach to electrocoagulate the AChA was developed and chronic experiments showed infarction compromising the IC on magnetic resonance imaging (MRI) scanning (day 4) and histology (day 11). Behavioral analysis was performed using a neurologic score previously developed and our own scoring method. Marmosets showed a decreased score that was still evident at day 10 after AChA electrocoagulation. We developed a new approach able to induce damage to the marmoset IC that may be useful for the detailed study of WM impairment and behavioral changes after stroke in the nonhuman primate.

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