Effects of penicillin G in the renal pelvis of normal and diabetes Wistar rats (Rattus norvegicus albinus)

Author(s)

Vanessa Morais Lima

• Document type: Master's Dissertation
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD)
• Defense date: 2012-05-25

Examining board members

Renato Paulo Chopard; Edson Aparecido Liberti; Anuar Ibrahim Mitre

• Advisor: Renato Paulo Chopard

Abstract

Penicillin G is the most important antibiotics. Besides having a low cost and proven effectiveness of treatment, it shows great possibilities for reducing morbidity and mortality from infectious diseases worldwide. As this medicine may cause sequelae in the renal parenchyma and associated structures, and since the net renal tubular secretion contributes to the excretion of penicillin G, where about 60% of the antibiotic is eliminated in urine, this study aims to investigate the main structural and ultrastructural changes occurring in the kidney of normal and diabetes rats. Thus, this project aims to describe and analyze the collagen fibers, smooth muscle and elastic fibers of the renal pelvis of Wistar rats, comparing control and penicillin G-treated animals. The animals were divided into 4 groups, normal rats (N), Wistar rats treated with penicillin G (NP); rats induced diabetes (D), diabetic Wistar rats with penicillin G (DP). The diabetes was induced in groups D and DP by alloxan. The fibrotic region of the renal pelvis was collected and reduced into small fragments. The sections were used for the transmission electron microscopy and stained by the following methods for optic microscopic: Iron Hematoxylin for disclosure of elastic fibers; Resorcin fuchsin for disclosure of elastic and elauninic fibers; Resorcin fuchsin after oxidation with 1% aqueous solution of oxone for disclosure of elastic, elauninic and oxytalan fibers; Azan evidencing the collagen and smooth muscle components; Picrosirius for observation of the collagen component (specifically type I and III); and Hematoxylin and Eosin, to show the cellular component. Microscopic and histomorphometry analysis showed that penicillin G alters the fibrous components of the renal pelvis, increasing areas of smooth muscle fibers and collagen type III deposition and decreasing mature elastic fibers (in this case, only between N and NP). Diabetes mellitus proved to be a metabolic disease also able to alter the morphology of the pelvis, leading to the augmentation of smooth muscle fiber area. Moreover, the area of type I collagen and the amount of mature elastic and elauninic fibers were diminished, while oxytalan fibers increased, together with a remarkable increase in the number of mitochondria. We can infer that the antibiotic therapy made by penicillin G and the diabetes, cause structural and ultrastructural differences in the renal pelvis of rats, mainly in the organization of elastic fiber, muscular and collagen components. (AU)

• FAPESP's process: 10/03666-1 - Effects of penicillin G in the renal pelvis of rats Wistar(Rattus norvegicus albinus)
• Grantee: Vanessa Morais Lima
• Support Opportunities: Scholarships in Brazil - Master