Maad Rayan Publishing Company Biomedical Research Bulletin 2980-9924 2 4 2024 12 29 A Video-Documented Mouse Model of Internal Capsule Stroke Induced by Photothrombotic Method Using Fiber Optic Technology: A Novel Approach 185 187 10.34172/biomedrb.2024.25 EN Mahsa Hasanzadeh-Moghadam https://orcid.org/0000-0001-9744-9952 Faraz Norouzi-Bonab Kimia Zabihi Kimia Motlagh Asghari Seyed Zanyar Athari https://orcid.org/0000-0001-8274-8570 Journal Article 10.34172/biomedrb.2024.25 2024 10 03 2024 12 23 The internal capsule is a critical structure that is highly susceptible to ischemic injury, yet traditional stroke models often fail to isolate and precisely target this region. Laser-based methods offer a novel approach for inducing controlled, localized ischemia with high spatial accuracy. This study aimed to develop a precise mouse model of internal capsule stroke induced by the photothrombotic method using fiber optic technology, providing a reproducible platform for studying ischemic injury and recovery mechanisms in this vital brain region. To this end, an adult male BALB/c mouse was anesthetized, and 150 μg Rose Bengal/g dissolved in normal saline was intraperitoneally injected for photothrombotic ischemia induction. The optic fiber was positioned into the brain’s internal capsule using a stereotaxic frame. The laser was activated for 10 minutes to induce ischemia, and stroke was validated three days post-procedure using 2,3,5-triphenyl-tetrazolium chloride staining to confirm lesion location and extent. This novel photothrombotic stroke model provides a powerful and reliable tool for investigating ischemic injury and recovery in the internal capsule. The precision and reproducibility of this method make it a significant advancement over traditional stroke models, with potential applications in understanding stroke pathophysiology and evaluating therapeutic interventions.