Nagwa Mostafa El-Sayed1, Eman Mohamed Aly2. 1. Department of Medical Parasitology, Research Institute of Ophthalmology, Giza 12556, Egypt. 2. Department of Basic Science, Biophysics and Laser Science Unit, Research Institute of Ophthalmology, Giza 12556, Egypt.
Abstract
AIM: To detect whether Toxoplasma gondii (T. gondii) infection of mice can induce retinal DNA damage. METHODS: A total of 20 laboratory-bred male Swiss albino mice were used and divided into four groups: control group (non-infected animals); T. gondii infected group; immunosuppressed infected group; and infected group treated with sulfadiazine and pyrimethamine. Mice eyes were collected 6wk post infection and retinas were obtained. Each retina was immediately processed for comet assay and the frequency of tailed nuclei (DNA damage) was calculated. In addition, retinal DNA damage was revealed by various comet assay parameters that were provided by the image analysis software including tail length, percentage of DNA in the tail, percentage of tailed cells and tail moment. RESULTS: The obtained results showed that T. gondii infection induced a statistically significant increase in the frequency of tailed nuclei, tail length, percentage of DNA in the tail, and tail moment in mice retinal cells compared to the control group (which showed some degree of DNA damage). In immunosuppressed infected group, retinal DNA damage was severing and there was significant increase in various comet assay parameters compared to both control and infected groups. After treatment with sulfadiazine and pyrimethamine, retinal DNA damage decreased and all comet assay parameters showed a statistical significant decrease compared to infected groups. CONCLUSION: T. gondii infection can induce DNA damage in mice retinal cells.
AIM: To detect whether Toxoplasma gondii (T. gondii) infection of mice can induce retinal DNA damage. METHODS: A total of 20 laboratory-bred male Swiss albino mice were used and divided into four groups: control group (non-infected animals); T. gondii infected group; immunosuppressed infected group; and infected group treated with sulfadiazine and pyrimethamine. Mice eyes were collected 6wk post infection and retinas were obtained. Each retina was immediately processed for comet assay and the frequency of tailed nuclei (DNA damage) was calculated. In addition, retinal DNA damage was revealed by various comet assay parameters that were provided by the image analysis software including tail length, percentage of DNA in the tail, percentage of tailed cells and tail moment. RESULTS: The obtained results showed that T. gondii infection induced a statistically significant increase in the frequency of tailed nuclei, tail length, percentage of DNA in the tail, and tail moment in mice retinal cells compared to the control group (which showed some degree of DNA damage). In immunosuppressed infected group, retinal DNA damage was severing and there was significant increase in various comet assay parameters compared to both control and infected groups. After treatment with sulfadiazine and pyrimethamine, retinal DNA damage decreased and all comet assay parameters showed a statistical significant decrease compared to infected groups. CONCLUSION: T. gondii infection can induce DNA damage in mice retinal cells.
Entities:
Keywords:
DNA damage; Toxoplasma gondii; comet assay; retinochoroiditis
Authors: J C R Silva; S M Gennari; A M A Ragozo; V R Amajones; C Magnabosco; L E O Yai; J S Ferreira-Neto; J P Dubey Journal: J Parasitol Date: 2002-04 Impact factor: 1.276
Authors: Samia E Etewa; Dalia A Abo El-Maaty; Rania S Hamza; Ashraf S Metwaly; Mohamed H Sarhan; Sara A Abdel-Rahman; Ghada M Fathy; Mahmoud A El-Shafey Journal: J Parasit Dis Date: 2017-12-15
Authors: Asmaa M El-Kady; Wafa Abdullah I Al-Megrin; Iman A M Abdel-Rahman; Eman Sayed; Eman Abdullah Alshehri; Majed H Wakid; Fadi M Baakdah; Khalil Mohamed; Hayam Elshazly; Hussah M Alobaid; Safa H Qahl; Hatem A Elshabrawy; Salwa S Younis Journal: Pathogens Date: 2022-07-15