Is pancreas development abnormal in the non-obese diabetic mouse, a spontaneous model of type I diabetes?
Braz. j. med. biol. res
;
34(4): 437-47, Apr. 2001. ilus, graf
Artigo
em Inglês
| LILACS
| ID: lil-282608
RESUMO
Despite extensive genetic and immunological research, the complex etiology and pathogenesis of type I diabetes remains unresolved. During the last few years, our attention has been focused on factors such as abnormalities of islet function and/or microenvironment, that could interact with immune partners in the spontaneous model of the disease, the non-obese diabetic (NOD) mouse. Intriguingly, the first anomalies that we noted in NOD mice, compared to control strains, are already present at birth and consist of 1) higher numbers of paradoxically hyperactive ß cells, assessed by in situ preproinsulin II expression; 2) high percentages of immature islets, representing islet neogenesis related to neonatal BETA-cell hyperactivity and suggestive of in utero BETA-cell stimulation; 3) elevated levels of some types of antigen-presenting cells and FasL+ cells, and 4) abnormalities of extracellular matrix (ECM) protein expression. However, the colocalization in all control mouse strains studied of fibroblast-like cells (anti-TR-7 labeling), some ECM proteins (particularly, fibronectin and collagen I), antigen-presenting cells and a few FasL+ cells at the periphery of islets undergoing neogenesis suggests that remodeling phenomena that normally take place during postnatal pancreas development could be disturbed in NOD mice. These data show that from birth onwards there is an intricate relationship between endocrine and immune events in the NOD mouse. They also suggest that tissue-specific autoimmune reactions could arise from developmental phenomena taking place during fetal life in which ECM-immune cell interaction(s) may play a key role
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Pâncreas
/
Diabetes Mellitus Tipo 1
Tipo de estudo:
Estudo prognóstico
Limite:
Animais
/
Feminino
/
Humanos
Idioma:
Inglês
Revista:
Braz. j. med. biol. res
Assunto da revista:
Biologia
/
Medicina
Ano de publicação:
2001
Tipo de documento:
Artigo
/
Congresso e conferência
País de afiliação:
França
Instituição/País de afiliação:
Université Paris V/FR
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