Metabolic effect of low fluoride levels in the islets of NOD mice: integrative morphological, immunohistochemical, and proteomic analyses

Author(s):Show less -

Juliana Sanches TREVIZOL ^[1] ; Aline DIONIZIO ^[2] ; Aislan Quintiliano DELGADO ^[3] ; Talita Mendes Oliveira VENTURA ^[4] ; Caroline Fernanda da Silva RIBEIRO ^[5] ; Laura RIBEIRO ^[6] ; Nathalia Rabelo BUZALAF ^[7] ; Tânia Mary CESTARI ^[8] ; Ana Carolina MAGALHÃES ^[9] ; Maiko SUZUKI ^[10] ; José Roberto BOSQUEIRO ^[11] ; Marília Afonso Rabelo BUZALAF ^[12]

Affiliation:Show less -

^[1] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Ciências Biológicas - Brasil

^[2] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Ciências Biológicas - Brasil

^[3] Universidade Estadual Paulista. Instituto de Biociências - Brasil

^[4] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Ciências Biológicas - Brasil

^[5] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Ciências Biológicas - Brasil

^[6] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Ciências Biológicas - Brasil

^[7] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Ciências Biológicas - Brasil

^[8] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Ciências Biológicas - Brasil

^[9] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Ciências Biológicas - Brasil

^[10] The Dental College of Georgia. Department of Oral Biology and Diagnostic Sciences - Estados Unidos

^[11] Universidade Estadual Paulista. Faculdade de Ciências. Departamento de Educação Física - Brasil

^[12] Universidade de São Paulo. Faculdade de Odontologia de Bauru. Departamento de Ciências Biológicas - Brasil

• Document type: Journal article
• Source: Journal of Applied Oral Science; v. 31, 2023-06-05.

Abstract

Abstract Fluoride (F) has been widely used to control dental caries, and studies suggest beneficial effects against diabetes when a low dose of F is added to the drinking water (10 mgF/L). Objectives This study evaluated metabolic changes in pancreatic islets of NOD mice exposed to low doses of F and the main pathways altered by the treatment. Methodology In total, 42 female NOD mice were randomly divided into two groups, considering the concentration of F administered in the drinking water for 14 weeks: 0 or 10 mgF/L. After the experimental period, the pancreas was collected for morphological and immunohistochemical analysis, and the islets for proteomic analysis. Results In the morphological and immunohistochemical analysis, no significant differences were found in the percentage of cells labelled for insulin, glucagon, and acetylated histone H3, although the treated group had higher percentages than the control group. Moreover, no significant differences were found for the mean percentages of pancreatic areas occupied by islets and for the pancreatic inflammatory infiltrate between the control and treated groups. Proteomic analysis showed large increases in histones H3 and, to a lesser extent, in histone acetyltransferases, concomitant with a decrease in enzymes involved in the formation of acetyl-CoA, besides many changes in proteins involved in several metabolic pathways, especially energy metabolism. The conjunction analysis of these data showed an attempt by the organism to maintain protein synthesis in the islets, even with the dramatic changes in energy metabolism. Conclusion Our data suggests epigenetic alterations in the islets of NOD mice exposed to F levels comparable to those found in public supply water consumed by humans. (AU)

• FAPESP's process: 18/00352-8 - Effect of fluoride in parameters related to insulin sensitivity and apoptosis of ² cells
• Grantee: Nathalia Rabelo Buzalaf
• Support Opportunities: Scholarships in Brazil - Scientific Initiation