Abstract

Age-related liver changes can have important implications for health and metabolic function. This study aimed to describe the morphoquantitative alterations of the liver in senescent rats compared to adult rats. Twelve male rats were used, divided into 6-month-old adults (group A) and 36-month-old senescent rats (group S). Morphometric and histopathological studies, quantification of collagen types I and III, and stereological analyses were performed to determine the volume density of mononucleated (VvhepM) and binucleated (VvhepB) hepatocyte nuclei, surface area density (SvhepM), and number density (NvhepM) of mononucleated hepatocyte nuclei. The findings reveal an alteration of the normal liver tissue architecture in senescent rats and the presence of inflammatory lesions and fibrosis. In addition, there was a decrease in body and liver mass and volume. Group S showed a significant reduction in VvhepM and NvhepM; however, SvhepM was significantly higher. No significant differences were noted in the percentage of binucleated hepatocytes between the two groups. This study reveals substantial morphological changes in the aging liver, with possible functional implications. More research is needed on the underlying mechanisms and their consequences at older ages. © 2024 by the authors.