The use of 99mTc-phytate for assessment the protective effect of vitamin E against hepatotoxicity induced by methotrexat in rat

In this study, we investigated the protective effect of vitamin E against methotrexate (MTX)-induced hepatotoxicity by quantitative liver 99mTc-phytate uptake and liver imaging and to compare its effect with histopathology in rat. Rats were divided into five groups as control, solvent, Vit E (100 mg/kg), MTX (20 mg/kg), Vit E + MTX and. Vit E was intraperitoneally administrated for 17 days before MTX injection and continued for 4 days. 99mTc-phytate was injected through the tail of rats after the drug administration. The percentage of the injected dose per gram of liver and spleen tissues (%ID/g) was calculated. Liver imaging was obtained with gamma camera. In other experiment, liver of treated rats were assessed for histopathology. 99mTc-phytate uptake per gram tissue of the livers as %ID/g in control, solvent, MTX, Vit E, Vit E + MTX and MTX groups were 8.99% ± 1.37, 8.53% ± 2.91, 8.65% ± 3.84, 3.22% ± 1.09 and 8.38% ± 2.68. Vit E administration with MTX resulted in a significant increasing in the level of %ID/g. Vit E treatment improved the shape of live in planner image. Histophatological examinations showed a protective effect of Vit E against MTX-induced hepatoxicity in rats. The results showed that Vit E significantly attenuates the MTX-induced hepatotoxicity in rats, and 99mTc-phytate uptake in liver as well as liver image to be acceptable techniques for assessment of liver and spleen damages and/or their tissues protective effects in animal model.Hepatotoxicity is one of the most common side effects of methotrexate (MTX) therapy in patients. The aim of this study was to evaluate the protective effect of vitamin E against MTX-induced hepatotoxicity using 99mTc-phytate as a radiopharmaceutical agent in animals. Rats were divided into five groups as follows: control, solvent, Vit E (100 mg/kg), MTX (20 mg/kg) and Vit E + MTX. Animals were intraperitoneally injected with Vit E for 17 days before MTX injection and continued for 4 days. 99mTc-phytate was injected into the tail of rats after the 21 days of Vit E administration. Percentage of the injected dose per gram of liver and spleen tissues (%ID/g) was calculated in treated rats. Liver imaging was obtained with gamma camera. In other experiment, liver of treated rats was assessed for histopathology. 99mTc-phytate uptake (%ID/g) of livers in control, solvent, Vit E, MTX and Vit E + MTX groups were 8.99% ± 1.37, 8.53% ± 2.91, 8.65% ± 3.84, 3.22% ± 1.09 and 8.38% ± 2.68. Vit E administration resulted in a significant increase of the level of %ID/g in MTX-injected animal. Vit E pre-treatment improved the shape of liver in MTX-treated rat which was seen abnormal view in planar imaging. Histophatological examinations approved the protective effect of Vit E against MTX-induced hepatotoxicity in rats. The results of this study show that Vit E significantly attenuates the MTX-induced hepatotoxicity in rats, and 99mTc-phytate is an acceptable radiopharmaceutical agent for assessment of liver and spleen damages in the animal model

99mTc-Glucarate for assessment of paclitaxel therapy in human ovarian cancer in mice

Objectives: The monitoring of cancer treatment response to chemotherapy is considered an essential strategy for follow-up of patients. The aim of this study was to evaluate the use of 99mTc-glucarate as a radiotracer for in vivo quantification and visualization of necrotic area and therapeutic effect of paclitaxel in ovarian cancer xenografted nude mice. Materials and Methods: After implantation of human ovarian cancer (SKOV-3) in nude mice, tumor xenografted mice were enrolled in two groups as control and treatment (paclitaxel) groups. 99mTc-glucarate uptakes were quantified in tumors of control and treatment groups and also tumor imaging was performed with a gamma camera. The necrotic and viable areas of tumor and tumoral masses were evaluated through histopathological and macroscopic observations, respectively. Results: 99mTc-glucarate uptake in tumor of treatment group was higher than control group.99mTc-glucarate uptake in ovarian tumor was clearly visualized with gamma imaging in both groups, but paclitaxel treated group showed higher radioactive uptake than control mice. The necrotic area in tumoral mass of mice treated with paclitaxel was confirmed by histopathological observations. Conclusion: 99mTc-glucarate is an effective radiotracer for evaluation and monitoring of tumor necrosis caused by chemotherapy, and it may be helpful for therapy monitoring in patients with cancer