Treatment of Experimental Periodontal Disease by Photodynamic Therapy in Rats With Diabetes

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Effect of periodontal treatment on metabolic control, systemic inflammation and cytokines in patients with type 2 diabetes

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Sequential IL-23 and IL-17 and increased Mmp8 and Mmp14 expression characterize the progression of an experimental model of periodontal disease in type 1 diabetes

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Temporal response pattern of biochemical analytes in experimental diabetes

The activities of the enzymes aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), lactate dehydrogenase (LD), creatine kinase (CK), amylase (AMS) and angiotensin converting enzyme (ACE) have been used to assess the toxic effects of xenobiotics that have hypoglycaemic action in hepatic, pancreatic, renal and muscle tissue. Using a validated experimental model of diabetes mellitus in rats, we ascertained whether this syndrome itself affected the serum activities of these enzymes over a 53-day period. Levels of hepatic enzymes AST, ALT and ALP were higher in the streptozotocin (STZ)diabetic rats (group D), but were controlled by insulin therapy (group DI). AMS was reduced in group D and unchanged in group DI rats. Proteinuria was detected 1 day after STZ administation and partially controlled by insulin (group DI); its early presence in group D rats, and the lack of any change in serum ACE in this group, indicates that proteinuria is the better marker for microangiopathy. Microscopic examination of liver, kidney, heart and skeletal muscles (soleus and extensor digitorum longus) revealed various alterations in group D rat tissues, which were less pronounced in group DI. The liver, pancreas and kidney tissue-damage was consistent with the altered serum levels of AST, ALT, ALP and AMS and proteinuria. We conclude that: (i) rigorous control is required when these serum-enzyme levels are used as indicators of tissue toxicity in experimental diabetes, and (ii) LD, CK and bilirubin serum levels, which are unaffected by diabetes, can be used when testing effects of xenobiotics on tissues.

Associação de tireopatias em uma população de pacientes com diabetes

OBJETIVO: Avaliar morfológica e funcionalmente a tireóide de pacientes com diabetes mellitus (DM) acompanhados ambulatorialmente no Hospital das Clínicas de Botucatu. MÉTODOS: No período de 1996 a 1998, a todo paciente com DM, exceto os com tireopatia prévia, era solicitada dosagem sérica de T4L, TSH, anti-TPO e TRAb e ultra-sonografia (US) da tireóide. Diagnosticou-se tireopatia quando havia dois ou mais parâmetros séricos ou a US alterados. Procedeu-se igualmente com pacientes ambulatoriais da mesma Instituição, sem DM e não-tireopatas prévios (controle). RESULTADOS: Os 256 pacientes com DM apresentaram maior freqüência de tireopatias que os 75 controles (51,6% vs. 38,7%; P<0,05). Entre os com tireopatias, ambos os grupos não diferiram quanto ao estado funcional da tireóide. Entre os pacientes com DM com e sem tireopatias, os primeiros apresentaram maior freqüência de mulheres, de DM tipo 2 e de história familiar de tireopatia. CONCLUSÕES: A elevada prevalência de tireopatias na população com DM conduz à recomendação de avaliação tireoidiana em todo paciente com DM.

Diabetes evolution in rats after neonatal treatment with alloxan

Physical exercises have been recommended in the prevention of non-insulin dependent diabetes mellitus (NIDDM), but the mechanisms involved in this intervention are not yet fully understood. Experimental models offer the opportunity for the study of this matter. The present study was designed to analyze the diabetes evolution in rats submitted to neonatal treatment with alloxan with the objective of verifying the suitability of the model to future studies with exercises. For this, newly born rats (6 days old) received intraperitoneal alloxan (A = 200 mg/kg of body weight). Rats injected with vehicle (citrate buffer) were used as controls (C). The fasting blood glucose level (mg/dL) was higher in the alloxan group at the day 28 (C=47.25 +/- 5.08; A=54.51 +/- 7.03) but not at the 60 day of age (C=69.18 +/- 8.31; A=66.81 +/- 6.08). The alloxan group presented higher blood glucose level during glucose tolerance test (GTT) (mg/dL. 120 min) in relation to the control group both at day 28 (C=16908.9 +/- 1078.8; A=21737,7 +/- 1106.4) and at day 60 (C=11463.45 +/- 655.30; A=15282.21 +/- 1221.84). Insulinaemia during GTT (ng/mL.120 min) was lower at day 28 (C=158.67 +/- 33.34; A=123.90 +/- 19.80), but presented no difference at day 60 (C=118.83 +/- 26.02; A=97.8 +/- 10.88). At day 60, the glycogen concentration in the soleus muscle (mg/100mg) was lower in the alloxan group (0.3 +/- 0.13) in relation to the control group (0.5 +/- 0.07). No difference was observed between groups in relation to (mu mol/g.h): Glucose Uptake (C = 5.8 +/- 0.63; A = 5.2 +/- 0.73); Glucose Oxidation (C= 4.3 +/- 1.13; A= 3.9 +/- 0.44); Glycogen Synthesis (C= 0.8 +/- 0.18; A= 0.7 +/- 0.18) and Lactate Production (C= 3.8 +/- 0.8; A= 3.8 0.7) by the isolated soleus muscle. The glucose-stimulated insulin secretion (16.7mM) by the isolated islets (ng/5 islets. h) of the alloxan group was lower (14.3 +/- 4.7) than the control group (32.0 +/- 7.9). Thus, we may conclude that this neonatal diabetes induction model gathers interesting characteristics and may be useful for further studies on the role of the exercise in the diabetes mellitus appearance.

The burden of physical activity on type 2 diabetes public healthcare expenditures among adults: a retrospective study

Background: Determinants of public healthcare expenditures in type 2 diabetics are not well investigated in developing nations and, therefore, it is not clear if higher physical activity decreases healthcare costs. The purpose of this study was to analyze the relationship between physical activity and the expenditures in public healthcare on type 2 diabetes mellitus treatment.Methods: Cross-sectional study carried out in Brazil. A total of 121 type 2 diabetics attended to in two Basic Healthcare Units were evaluated. Public healthcare expenditures in the last year were estimated using a specific standard table. Also evaluated were: socio-demographic variables; chronological age; exogenous insulin use; smoking habits; fasting glucose test; diabetic neuropathy and anthropometric measures. Habitual physical activity was assessed by questionnaire.Results: Age (r = 0.20; p = 0.023), body mass index (r = 0.33; p = 0.001) and waist-to-hip ratio (r = 0.20; p = 0.025) were positively related to expenditures on medication for the treatment of diseases other than diabetes. Insulin use was associated with increased expenditures. Higher physical activity was associated with lower expenditure, provided medication for treatment of diseases other than diabetes (OR = 0.19; p = 0.007) and medical consultations (OR = 0.26; p = 0.029).Conclusions: Type 2 diabetics with higher enrollment in physical activity presented consistently lower healthcare expenditures for the public healthcare system.

Diabetes auto-referido em idosos: prevalência, fatores associados e práticas de controle

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Prática de atividades físicas e custo do tratamento ambulatorial de diabéticos tipo 2 atendidos em unidade básica de saúde

OBJETIVOS: Observar se existem diferenças nos valores monetários destinados aos procedimentos de saúde para o tratamento de pacientes diabéticos tipo 2 quando estratificados em diferentes níveis de atividade física habitual. SUJEITOS E MÉTODOS: Cento e vinte um diabéticos tipo 2 foram avaliados em duas unidades básicas de saúde de Bauru, SP. Atividade física foi avaliada por meio de entrevista. Retroagindo um ano ao dia da avaliação, por meio de notas fiscais, foram computados valores de exames, medicamentos e consultas médicas e de enfermagem. RESULTADOS: Quando comparados aos diabéticos ativos, os sedentários apresentaram gastos com consultas em clínico-geral 63% superiores (p = 0,017). Gastos com medicamentos para o tratamento de outras doenças também foram superiores em diabéticos sedentários (p = 0,001). CONCLUSÕES: Quando comparados de acordo com a prática de atividades físicas, diabéticos tipo 2 com menor prática de atividades físicas apresentam maiores custos com serviços médicos e consumo de medicamentos.

Effects of experimental diabetes on the structure and ultrastructure of the coagulating gland of C57BL/6J and NOD mice

Diabetes mellitus can lead to reproductive disorders that in turn result in weakened fertility brought about by morphofunctional changes in the testes and accessory sex glands. However, doubts persist concerning the basic biology of the secretory epithelial cells and the stroma of the coagulating gland of diabetic mice. Thus, the objective of the present study was to analyze the histological and ultrastructural changes associated with stereology of the coagulating gland of mice with alloxan-induced diabetes, and of spontaneously diabetic mice. Sixteen mice of the C57BL/6J strain, and eight non-obese diabetic (NOD) mice were used. The animals were divided into three groups: 1) control (C), 2) alloxan diabetic (AD), and 3) NOD. Thirty days after the detection of diabetic status in group 2, all of the animals were killed and then perfused with Karnovsky's solution through the left cardiac ventricle. The coagulating gland was then removed and processed for morphometric study by light microscopy and electron microscopy. The results showed thickening of the stroma, atrophy of secretory epithelial cells, and disorganization of the organelles involved in the secretory process in both NOD and alloxan-induced mice. Thus, it may be concluded that the coagulating gland suffered drastic morphological changes, and consequently impaired glandular function, in the presence of diabetes mellitus type I in both NOD and AD mice. (C) 2003 Wiley-Liss, Inc.

Immune modulation induced by tuberculosis DNA vaccine protects non-obese diabetic mice from diabetes progression

We have described previously the prophylactic and therapeutic effect of a DNA vaccine encoding the Mycobacterium leprae 65 kDa heat shock protein (DNA-HSP65) in experimental murine tuberculosis. However, the high homology of this protein to the corresponding mammalian 60 kDa heat shock protein (Hsp60), together with the CpG motifs in the plasmid vector, could trigger or exacerbate the development of autoimmune diseases. The non-obese diabetic (NOD) mouse develops insulin-dependent diabetes mellitus (IDDM) spontaneously as a consequence of an autoimmune process that leads to destruction of the insulin-producing beta cells of the pancreas. IDDM is characterized by increased T helper 1 (Th1) cell responses toward several autoantigens, including Hsp60, glutamic acid decarboxylase and insulin. In the present study, we evaluated the potential of DNA-HSP65 injection to modulate diabetes in NOD mice. Our results show that DNA-HSP65 or DNA empty vector had no diabetogenic effect and actually protected NOD mice against the development of severe diabetes. However, this effect was more pronounced in DNA-HSP65-injected mice. The protective effect of DNA-HSP65 injection was associated with a clear shift in the cellular infiltration pattern in the pancreas. This change included reduction of CD4(+) and CD8(+) T cells infiltration, appearance of CD25(+) cells influx and an increased staining for interleukin (IL)-10 in the islets. These results show that DNA-HSP65 can protect NOD mice against diabetes and can therefore be considered in the development of new immunotherapeutic strategies.

Effect of maternal obesity on diabetes development in adult rat offspring

This study aimed to evaluate whether maternal obesity leads to the onset of diabetes in adult Wistar rats offspring. MSG solution neonatally administration induced obesity in rats (F(1)MSG group, n = 30); and saline solution was also administrated to control rats (F1CON group, n = 13). In 3rd month of age, both control and MS G groups were mated for offspring (generation FA named as F2CON, n = 28 and F(2)MSG groups, n = 15; and so both generations were studied until 7th month of life. Lee Index was measured for experimental obesity validation from 5th to 7th month. Glycemia was weekly determined during pregnancy and monthly from 3rd to 7th month. In the end of experimental period all rats were submitted to oral glucose tolerance test (OGTT), with estimation of total area under the curve (AUC); and insulin tolerance test (ITT). Rats were then anesthetized and killed. Data were statistically analyzed with significance level of p < 0.05. Lee Index has confirmed obesity in all MSG rats. Glycemic levels comparisons between generations showed significant maternal interference in control and MSG groups. OGTT analysis showed higher glycemia in obese rats (F(1)MSG) and their offspring (F(2)MSG) as compared to their respective controls; and MSG groups increased AUC from OGTT. As regards ITT, F(2)MSG showed higher glycemia at 30 and 120 min, suggesting a delay of insulin action decreasing. Although glucose intolerance and insulin resistance clinical conditions represent as a factors for type 2 Diabetes mellitus development, this experimental model proposal was not efficient to induce type 2 Diabetes mellitus, but for obesity developing, glucose intolerance and insulin resistance in successive generations of rats. (c) 2007 Elsevier B.V. All rights reserved.

Serum titres of anti-glutamic acid decarboxylase-65 and anti-IA-2 autoantibodies are associated with different immunoregulatory milieu in newly diagnosed type 1 diabetes patients

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