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Comparison of Goto-Kakizaki rats and high fat diet-induced obese rats: Are they reliable models to study Type 2 Diabetes mellitus?

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Tatagiba Kuwabara, Wilson Mitsuo [1] ; Panveloski-Costa, Ana Carolina [1] ; Fukusawa Yokota, Caroline Naomi [1] ; Bertaglia Pereira, Joice Naiara [1, 2] ; Mancini Filho, Jorge [3] ; Torres, Rosangela Pavan [3] ; Hirabara, Sandro Massao [2] ; Curi, Rui [1, 2] ; Alba-Loureiro, Tatiana Carolina [1]
Número total de Autores: 9
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Biomed Sci, Dept Physiol & Biophys, Sao Paulo - Brazil
[2] Cruzeiro do Sul Univ, Sao Paulo - Brazil
[3] Univ Sao Paulo, Fac Pharmaceut Sci, Sao Paulo - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: PLoS One; v. 12, n. 12 DEC 8 2017.
Citações Web of Science: 16

Type 2 Diabetes mellitus (T2DM) is an evident growing disease that affects different cultures throughout the world. T2DM occurs under the influence of three main factors: the genetic background, environmental and behavioral components. Obesity is strongly associated to the development of T2DM in the occident, while in the orient most of the diabetic patients are considered lean. Genetics may be a key factor in the development of T2DM in societies where obesity is not a recurrent public health problem. Herein, two different models of rats were used to understand their differences and reliability as experimental models to study the pathophysiology of T2DM, in two different approaches: the genetic (GK rats) and the environmental (HFD-induced obese rats) influences. GK rats were resistant to weight gain even though food/energy consumption (relative to body weight) was higher in this group. HFD, on the other hand, induced obesity in Wistar rats. White adipose tissue (WAT) expansion in this group was accompanied by immune cells infiltration, inflammation and insulin resistance. GK rats also presented WAT inflammation and insulin resistance; however, no immune cells infiltration was observed in the WAT of this group. Liver of HFD group presented fat accumulation without differences in inflammatory cytokines content, while liver of GK rats didn't present fat accumulation, but showed an increase of IL-6 and IL-10 content and glycogen. Also, GK rats showed increased plasma GOT and GPT. Soleus muscle of HFD presented normal insulin signaling, contrary to GK rats, which presented higher content of basal phosphorylation of GSK-3 beta. Our results demonstrated that HFD developed a mild insulin resistance in Wistar rats, but was not sufficient to develop T2DM. In contrast, GK rats presented all the typical hallmarks of T2DM, such as insulin resistance, defective insulin production, fasting hyperglycemia/hyperinsulinemia and lipid plasma alteration. Thus, on the given time point of this study, we may conclude that only GK rats shown to be a reliable model to study T2DM. (AU)

Processo FAPESP: 15/03175-1 - Papel dos neutrófilos na resposta inflamatória no Diabetes mellitus tipo 2: estudo dos mecanismos celulares e moleculares
Beneficiário:Tatiana Carolina Alba Loureiro
Linha de fomento: Auxílio à Pesquisa - Regular