Abstract
<p class="abstract"><strong>Background:</strong> Cyclophosphamide is anticancer and immunosuppressant agent used to treat malignant and autoimmune diseases. Its long-term use causes side effects, as infertility and pulmonary toxicity. Coenzyme Q10; the only synthesized antioxidant in human body, acts as powerful antioxidant, scavenging free radicals, and inhibiting lipid peroxidation. Aim of present study was to examine effect of coenzyme Q10 on blood biochemical profiles, histopathological changes in lungs of adult rats exposed to cyclophosphamide-induced toxicity.</p><p class="abstract"><strong>Methods:</strong> 36 adult male albino rats divided into four groups; control and three experimental each having 9 rats. First experimental group received coenzyme Q10, second received cyclophosphamide while third group received coenzyme Q10 along with cyclophosphamide. Experiment lasted for 7 days. On 8th day, animals were sacrificed by decapitation. Lung tissue samples were collected for histopathological examination. SOD (superoxide dismutase) and MDA (malondialdehyde) levels were determined and used for statistical analysis. </p><p class="abstract"><strong>Results:</strong> In coenzyme Q10 treated group, H&amp;E stained sections revealed normal respiratory alveoli. Ultrathin sections revealed normal alveolar septa, pneumocyte and blood capillaries contain erythrocytes. In cyclophosphamide treated group, H&amp;E stained sections revealed peribronchial and interstitial fibrosis. Ultrathin sections revealed alveoli having apparent free lumen with extravasated erythrocytes. Alveolar septa revealed collagen fibrils deposits, and proliferated fibroblasts. In combined coenzyme Q10 and cyclophosphamide treated group, H&amp;E stained sections revealed marked decrease of inter-alveolar tissue thickening. Ultrathin sections revealed destructed alveolar septa with dissociated remnants of collagen fibrils. Blood capillaries appeared wide, containing monocytes and erythrocytes.</p><p class="abstract"><strong>Conclusions:</strong> Administration of coenzyme Q10 with cyclophosphamide is advised to alleviate cyclophosphamide-induced lung toxicity.</p>
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