Histopathological Evaluation of Protective Effect of Telmisartan against Radiation-Induced Bone Marrow Injury

Abstract

Background: Radiation-induced hematopoietic suppression and myelotoxicity can occur due to the nuclear accidents, occupational irradiation and therapeutic interventions. Bone marrow dysfunction has always been one of the most important causes of morbidity and mortality after ionizing irradiation. Objective: This study aims to investigate the protective effect of telmisartan against radiation-induced bone marrow injuries in a Balb/c mouse model. Material and Methods: In this experimental study, male Balb/c mice were divided into four groups as follow: group 1: mice received phosphate buffered saline (PBS) without irradiation, group 2: mice received a solution of telmisartan in PBS without irradiation, group 3: mice received PBS with irradiation, and group 4: mice received a solution of telmisartan in PBS with irradiation. A solution of telmisartan was prepared and administered orally at 12 mg/kg body weight for seven consecutive days prior to whole body exposing to a single sub-lethal dose of 5 Gy X-rays. Protection of bone marrow against radiation induced damage was investigated by Hematoxylin-Eosin (HE) staining assay at 3, 9, 15 and 30 days after irradiation. Results: Histopathological analysis indicated that administration of telmisartan reduced X-radiation-induced damage and improved bone marrow histology. The number of different cell types in bone marrow, including polymorphonuclear /mononuclear cells and megakaryocytes significantly increased in telmisartan treated group compared to the only irradiated group at all-time points. Conclusion: The results of the present study demonstrated an efficient radioprotective effect of telmisartan in mouse bone marrow against sub-lethal X-irradiation.

Apoptotic vesicles are required to repair DNA damage and suppress premature cellular senescence

“…The above experimental results preliminarily demonstrated the correlation between the deficiency of apoVs and the reduced DNA repair capacity. To further confirm this correlation, we generated a classic animal model of DNA damage induced by X-ray irradiation (Chang et al, 2016;Fooladi et al, 2022;Murphy & Kamen, 2019). First, we exposed normal WT mice and apoV-deficient Fas mut mice to 5.5 grey sublethal dose of total-body irradiation (TBI) by X-ray irradiator (RS2000, Rad Source, the USA).…”

Radiation induced therapeutic effects in cancerous and tumor cells: A review

“…105 Bone marrow dysfunction has historically been one of the main causes of morbidity and mortality after ionizing radiation (Table 3). 106 Effects of radiation on the eye: High doses of ultraviolet (UV) radiation can be harmful to your eyes. Ultraviolet radiation is known to have both beneficial and detrimental effects on the human body.…”