Periondontitis modulates insulin signaling, c-jun N-terminal kinase activity, IKK activity, and insulin recptor substrate-1 (ser 307) phosphorylation in muscle and liver of wistar rats / A influencia da periodontite na via de sinalização da insulina em musculo e figado de ratos machos wistar

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Traditional thinking/paradigms have maintained that periodontits is na oral disease and that the tissue destructive response remains localized within the periodontium, limiting effects of the disease to oral tissues supporting the teeth. Recent studies have indicated that periodontits may produce any number of alterations in systemic health and in the present study we investigated the pathophysiological relationships between periodontitis and insulin resistance. However, the exact molecular mechanism in unknown. We have examined the levels and the tirosine phosphorylation status of insulin receptor (IR), IRS-1, IRS-2, ERK1/2, JNK1/2, the serine phosphorylation status of Akt , IRS-1 and the expression of IicjJ-a, in liver and muscle of rats with periodontitis by immunoblotting with specific antibodies. The results show that the levels of the insulin receptor, IRS-1, IRS-2, Akt, JNK1/2, ERK 1/2 with and without insulin stimulated remains unchanged in both tissues. In the muscle, animals with periodontits, the insulin stimulated IR tirosine phosphorylation was decrease to 15±33%, the IRS-1 tirosine phosphorylation was decrease to 55±3%, the IRS-2 tirosine phosphorylation was decrease to 48±1,5%, the Akt serine phosphorylation was decrease to 34 ±2,8%, the ERK1/2 tirosine phosphorylation was decrease to 20±1% (p<0,05). In addition, rats with periodontitis had a increase of 40±0,4% in tyrosine phosphorylation of JNK. 1/2, 60±5,4% in serine phosphorylation of IRS-1 and the expression of Ik(3-o. was reduced in 70±4,2% (p<0,05). In the liver, animals with periodontite insulin stimulated had a decrease of 62±2% in tirosine phosphorylation of insulin receptor, the IRS-1 tirosine phosphorylation was decrease to 45±3,8%, the IRS-2 tirosine phosphorylation was decrease to 55±0,5%, the Akt serine phosphorylation was decrease to 31 ±3%, the ERK1/2 tirosine phosphorylation was decrease to 22±4% (p<0,05). In addition, rats with periodontitis had a increase of 50±0,5% in tirosine phosphorylation of INK 1/2, 40±4% in serine phosphorylation of IRS-1 and the expression of Ik(3-o; was reduced in 55±4,2% (p<0,05). In addition, the thirty minute insulin tolerance test (ITT), the rats with periodontitis had a decrease of 50% in the value of Kitt. In the oral glucose tolerance test (oGTT) the area under the glucose curve was 18,7% higher in rats with periodontitis and the area under the insulin curve was 43,4% higher in rats with periodontitis. These data suggest that periodontitis impair insulin signaling in muscle and liver of rats Wistar

ASSUNTO(S)

resistencia a insulina periodontal diseases periodontitis insulin resistance diabetes periodontite doença periodontal diabetes

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