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| Author(s): |
Ana Carolina Panveloski Costa
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Ciências Biomédicas (ICB/SDI) |
| Defense date: | 2015-10-01 |
| Examining board members: |
Maria Tereza Nunes;
Everardo Magalhães Carneiro;
Rui Curi;
Adriano Namo Cury;
Fernanda Ortis
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| Advisor: | Maria Tereza Nunes |
| Abstract | |
Diabetes meliitus (DM) is the endocrinopathy most prevalent around the world. The subclinical inflammation in DM and obesity has important role on insulin resistance development and is caused in consequence of increased inflammatory cells infiltration and expression of inflammatory cytokines in tissues which are essential to glucose homeostasis. Hipo or hiperthyroidism states there is decreased insulin-induced glucose uptake in adipose tissue and skeletal muscle, which reinforces the importance of thyroid function integrity to glycemia control. Lately, several studies have pointed positive relationship between DM and thyroid dysfunctions. In this context, we hypothesis of the present study was that triiodothyronine (T3) could promotes benefitial effects on insulin sensitivity by altering expression of inflammatory cytokines in experimental models of DM or obesity. In order to this hypothesis, type 1 DM - DM1 (alloxan induced) or obese (cafeteria diet induced) rats were treated with T3 during 4-week period. The DM1 rats presented primary hypothyroidism and increased inflammatory cells infiltration and expression of inflammatory tumoral necrosis factor (TNF-α) and interleukin-6 (IL-6) on epididymal adipose tissue (EAT) and soleus skeletal muscle. The treatment with T3 promoted reduction of glycemia, improvement of insulin sensitivity and decrease on expression of TNF-α and IL-6 in EAT and soleus skeletal muscle. The obese rats presented subclinical hyperthyroidism, increased glycemia and reduction of insulin sensitivity. The treatment with T3 in this experimental model promoted increase on insulin sensitivity and glucose tolerance, furthermore, reduction in expression of TNF-α and IL-6 in EAT and soleus skeletal muscle. Even though, side effects of T3 on cardiac function, it was not observed any alteration in arterial pressure of DM1 rats treated with T3. Taken together the results of the present study, it could be conclude that treatment with T3 promotes improvement on insulin sensitivity in DM1 and obese rats, mechanism which involves reduction in expression of inflammatory cytokines on adipose tissue and skeletal muscle. (AU) | |
| FAPESP's process: | 11/09014-9 - EFFECTS OF THYROID HORMONE IN MODULATING THE EXPRESSION OF CYTOKINES INVOLVED IN INSULIN SIGNALING DURING OBESITY OR DIABETES |
| Grantee: | Ana Carolina Panveloski Costa Salomão |
| Support Opportunities: | Scholarships in Brazil - Doctorate |