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DNA content, chromatin supraorganization, nuclear glycoproteins and RNA amounts in hepatocytes of mice expressing insulin-dependent diabetes.
Mello, Maria Luiza S; Aldrovani, Marcela; Moraes, Alberto Silva; Guaraldo, Ana Maria Aparecida; Vidal, Benedicto de Campos.
Afiliação
  • Mello ML; Department of Cell Biology, Institute of Biology, University of Campinas (UNICAMP), 13083-863 Campinas, SP, Brazil. mlsmello@unicamp.br
Micron ; 40(5-6): 577-85, 2009.
Article em En | MEDLINE | ID: mdl-19328698
Chromatin supraorganization and extensibility and nuclear glycoprotein content have been reported to change in hepatocytes from mice during development and aging, as well as under starvation and refeeding conditions. In non-obese diabetic (NOD) mice, the expression of insulin-dependent diabetes may be accompanied by metabolic changes in the liver. These changes are likely to be similar to those involved in the aging processes of non-diabetic animals. Therefore, we hypothesized that the chromatin organization, as well as the physical properties and compositions of hepatocyte nuclei would also be affected in NOD mice in the same way as those in aged non-diabetic mice. Nuclear image parameters were evaluated by image analysis of Feulgen-stained preparations. Chromatin extensibility in response to gravity was observed with polarized light after lysis and toluidine blue staining. The Con-A response of nuclear glycoproteins was evaluated with scanning microspectrophotometry. These characteristics were assessed using hepatocyte imprints from female NOD mice after a 28-day period of diabetes expression. Observations and measurements were made in comparison to healthy BALB/c mice. Total RNA amounts were determined for livers of NOD and BALB/c mice. Enhanced polyploidy levels, a decrease in chromatin higher-order packing states, an increased frequency of extended chromatin fiber formation, and deeper Con-A-responsive chromatin areas were observed in the hepatocytes of the NOD mice expressing insulin-dependent diabetes. Reduced amounts of total RNA were also found in the livers of these mice. Our findings for NOD mice expressing insulin-dependent diabetes are consistent with previously reported data for old-aged mice of the inbred strain A/Uni and may reflect changes in transcriptional activities associated with the stressful physiological demands on the liver during the expression of diabetes.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: DNA / RNA / Cromatina / Glicoproteínas / Núcleo Celular / Hepatócitos Limite: Animals Idioma: En Revista: Micron Assunto da revista: DIAGNOSTICO POR IMAGEM Ano de publicação: 2009 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: DNA / RNA / Cromatina / Glicoproteínas / Núcleo Celular / Hepatócitos Limite: Animals Idioma: En Revista: Micron Assunto da revista: DIAGNOSTICO POR IMAGEM Ano de publicação: 2009 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido