Metabolic and morphological changes in RAT tissues under the effect of electronic cigarettes
Abstract
Introduction. Electronic cigarettes are widely used as a potentially less harmful alternative to conventional smoking, generating aerosol without exothermic combustion. Exposure to e-cigarette aerosols increases reactive oxygen species and lipid peroxidation products, which modify key metabolic enzymes and disrupt energy and lipid homeostasis. These effects are reflected in elevated lactate dehydrogenase (LDH) and creatine kinase (CK) activities, altered glucose levels, and morphological tissue changes confirmed by histology. Aim of the study. To establish organ-specific changes in energy and lipid homeostasis indicators, as well as morphological alterations in rat tissues under conditions of chronic exposure to electronic cigarette aerosols. Materials and Methods. Twenty adult male Wistar rats were divided into the experimental (n = 10) and the control (n = 10) groups. Experimental animals were exposed to aerosol from an Elf Bar 1500 Ultra e-cigarette for 20 minutes daily over three months; animals in the control group were not exposed. Animals were euthanized one hour after the final session, and tissue samples from the lungs, liver, heart, kidneys, and brain were collected for biochemical assays and histological examination. Results. Chronic exposure increased LDH and CK in lungs and liver, indicating anaerobic glycolysis activation and cytolytic injury, accompanied by inflammation, edema, and alveolar disruption. Reduced tissue glucose and suppressed enzymatic activity…
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