Estudo do efeito do ácido cinâmico e cinamato de metila no metabolismo glicolipídico em camundongos

Abstract

Dyslipidemia and diabetes are presented as important risk factors in cardiovascular disease. When is associated with oxidative stress may accelerate the progression of atherosclerotic lesions. Studies with natural products provide interesting data in the control of these diseases. In the present study two compounds cinnamon derivatives, cinnamic acid (CA) and methyl cinnamate (MC) and structurally similar biological and pharmacological activities already described above were used. The present study aims to evaluate the possible hypolipidemic and hypoglycemic effects as well as the antioxidant potential of cinnamic acid and methyl cinnamate in experimental protocols pharmacologically induced dyslipidemia and diabetes. Hyperlipidemia was induced in male mice by two acute protocols through a single intraperitoneal administration of 400mg/kg Triton WR -1339 and 400mg/kg Poloxamer -407 in all animals except the negative control. The groups were treated orally by gavage, where the positive control and the negative control received drinking water according to the weight of fenofibrate group received 200mg/kg, whereas the cinnamic acid, methyl cinnamate groups and received the same dose 20mg/kg. The blood of these animals was collected at 24 and 48 hours after induction and was plamáticos checked the levels of total cholesterol, triglycerides, glucose, AST and ALT. After collecting 48 hours we removed the liver tissue , in both protocols , to analyze lipid peroxidation , through the determination of non-protein sulfhydryl groups ( NP -SH ) , malondialdehyde ( MDA ) and antioxidant enzyme : superoxide dismutase (SOD ), and catalase (CAT). To determine the hypoglycemic potential of cinnamic acid and methyl cinnamate was used protocol alloxan induced diabetic by a single intraperitoneal injection at 200mg/kg. Both groups were treated for 7 days with drinking water according to the weight (positive control group), 50mg/Kg metformin (metformin group), cinnamic acid 20mg/kg (cinnamic acid group) and methyl cinnamate 20mg/kg (group cinamto methyl). It was observed that after induction with either Poloxamer as Triton, AC and BC were able to reduce cholesterol and triglycerides after 24 and 48 hours, without changing the liver enzymes AST and ALT. Added to this factor was observed that the substance under study showed some activity on oxidative stress in order to reduce the MDA and NP -SH in the protocol of the Triton and NP -SH in the poloxamer protocol. Having methyl cinnamate presented higher activity compared to cinnamic acid analysis 48 hours after the induction of both protocols. Observing the response of the CM and the AC induction protocol in alloxan diabetes, it was found that these compounds were able to similarly reduce the glucose levels. The results showed the therapeutic potential of CA and CM in the treatment of dyslipidemia and diabetes, however does require new studies in chronic protocols that can ensure the safety and efficacy of its use.