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Introduction: Post- traumatic stress disorder (PTSD) is a psychiatric disorder which occurs after the experience of life threatening events as natural disasters, military combat, serious accidents, or violent sexual assaults. It has a severe impact on quality of life. Aim of the work to study the effect of single prolonged stress on the structure of hippocampus in adult male albino rats. Materials and Methods 20 adult male albino rats were randomly divided into four groups control group (group I) and single prolonged stress group examined at day 1(group II), day 7 (group III) and day 14 (groupIV). Rats were restrained by placing them in plastic restrainers, immediately followed by 20 minutes of forced swimming in 20–24°C water. Rats were exposed to ether until general anesthesia then they were placed in their home cages. At the end of the experiment, the hippocampi were taken and processed for light microscopic study. Results pyramidal cells of the CA3 region of the hippocampus showed progressive degeneration with passage of time from day 1 to day 14 with decrease in thickness. Transient increase in glial fibrillary acidic protein (GFAP) expression in the astrocytes of the hippocampus was detected at day 1 followed by reduction in GFAP expression started at day seven and continued to day 14. Conclusion post-traumatic stress PTSD causes significant structural hippocampal neuronal damage affecting the CA3 hippocampal subfield.

Background Nanoparticles (NPs) have unique and novel properties that lead to a diverse array of products with applications in diagnosis, drug delivery, food industry, paints, electronics, environmental cleanup, cosmetics and sunscreens. Zinc oxide nanoparticles (ZnO NPs) are one of the most widely used engineered nanoparticles in consumer products. They are utilized in many commercial products including cosmetics, paints, textiles, and personal hygiene products. The study aimed to assess the effects of zinc oxide nanoparticles administered Intranasal or intravenous on lung tissue. Materials & methods twenty-five male Wistar rats were divided into Group I; control group, group II (Intranasal administered group) group II (Intravenous administered group). The animals were injected with 4 mg/kg of ZnO NPs. Rat Lungs were processed for histological, immunohistochemical. Results ZnO NPs caused thickening of interalveolar septa. Mononuclear cells were seen infiltrating the interalveolar septa. Many dilated blood vessels exhibited focal disruption and focal thickening of their wall. Tumor necrosis factor-alpha (TNF-α) immune reactivity was significantly increased. These findings increased mainly in the intranasal administered group when compared with the intravenous group. Conclusion ZnO NPs administration caused toxic effects on the histological structure of albino rat lung.