SD rats were divided into three groups, including the control (6 weeks), HF-LPLI/6-week and HF-LPLI/12-week groups, and were analyzed at the corresponding time point. Rats were anesthetized with 10% chloral hydrate and treated with fluorescein that was injected through the tail vein. At 60 min post-infection images were obtained after intraperitoneal injection of D-luciferin (150 mg/kg body weight; Thermo Fisher Scientific, Inc.), followed by 50 μl D-luciferin (0.75 mg in PBS) through the oral cavity. The IVIS Lumina image system (Xenogen Corporation, Alameda, CA, EUA) was used to capture the images (44 (link)).