ABSTRACT Objective: The present study aimed to evaluate glucose variability and hormonal responses during and after an aerobic exercise session performed after breakfast in type 2 diabetes patients treated with metformin. Materials and methods: In this quasi-experimental study individuals underwent clinical and laboratory evaluations and maximal exercise test. After two weeks an aerobic exercise session (30 minutes at 60%-70% of the peak heart rate) was performed. At rest, during and after the exercise session, glucose variability (mean amplitude glucose excursions, glucose coefficient of variation, and glucose standard deviation) and levels of plasma glucose, insulin, glucagon, and glucagon-like-peptide-1 were evaluated. Results: Thirteen patients were enrolled in the study. Plasma glucose increased at 15 minutes during the exercise session (244.6 ± 61.9 mg/dL), and decreased at 60 min after exercise (195.6 ± 50.0 mg/dL). Glucose variability did not show any difference before and after exercise. Insulin levels at 15 min [27.1 µU/mL (14.2-42.1)] and 30 min [26.3 µU/mL (14.6-37.4)] during the exercise were higher than those at fasting [11.2 µU/mL (6.7-14.9)] but decreased 60 minutes after exercise (90 minutes) [16.6 µU/mL (8.7-31.7)]. Glucagon levels did not show any difference. GLP-1 levels increased at 30 min [7.9 pmol/L (7.1-9.2)] during exercise and decreased 60 min after exercise (90 minutes) [7.7 pmol/L (6.8-8.5)]. Conclusion: Subjects with type 2 diabetes presented expected changes in insulin, glucagon and GLP-1 levels after breakfast and a single aerobic exercise session, not accompanied by glycemic variability changes.

Resumo A obesidade associada à inflamação sistêmica induz resistência à insulina (RI), com consequente hiperglicemia crônica. Este processo envolve o aumento na liberação de citocinas pró-inflamatórias, ativação da enzima c-Jun N-terminal cinase (JNK), do fator nuclear kappa-B (NF-κB) e dos receptores do tipo Toll 4 (TLR4). Dentre as ferramentas terapêuticas disponíveis, o exercício físico (EF) tem efeito hipoglicemiante conhecido, explicado por mecanismos moleculares complexos. Dentre eles, ocorre aumento na fosforilação do receptor da insulina, na atividade da proteína quinase ativada por AMP (AMPK), na via da proteína cinase cinase dependente de Ca+2/calmodulina (CaMKK), com posterior ativação do coativador-1α do receptor ativado por proliferador do peroxissoma (PGC-1α), proteínas Rac1, TBC1 membro das famílias de domínio 1 e 4 (TBC1D1 e TBC1D4), além de uma variedade de moléculas de sinalização, como as proteínas GTPases, Rab e proteína solúvel de fusão sensível a N-etil-maleimida (SNARE); estas vias promovem maior translocação de transportador de glicose do tipo 4 (GLUT4) e consequente captação de glicose pelo músculo esquelético. A cinase fosfatidilinositol-dependente (PDK), proteína quinase C atípica (aPKC) e algumas das suas isoformas, como a PKC-iota/lambda também parecem desempenhar papel fundamental no transporte de glicose. Nesse sentido, a associação entre autofagia e EF também tem demonstrado papel relevante na captação de glicose muscular. A insulina, por sua vez, utiliza um mecanismo dependente da fosfatidilinositol-3-quinase (PI3K), enquanto que o sinal do EF pode ter início mediante liberação de cálcio pelo retículo sarcoplasmático e concomitante ativação da AMPK. O objetivo desta revisão é descrever os principais mecanismos moleculares da RI e da relação entre o EF e a captação de glicose.

Abstract Obesity associated with systemic inflammation induces insulin resistance (IR), with consequent chronic hyperglycemia. A series of reactions are involved in this process, including increased release of proinflammatory cytokines, and activation of c-Jun N-terminal kinase (JNK), nuclear factor-kappa B (NF-κB) and toll-like receptor 4 (TLR4) receptors. Among the therapeutic tools available nowadays, physical exercise (PE) has a known hypoglycemic effect explained by complex molecular mechanisms, including an increase in insulin receptor phosphorylation, in AMP-activated protein kinase (AMPK) activity, in the Ca2+/calmodulin-dependent protein kinase kinase (CaMKK) pathway, with subsequent activation of peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α), Rac1, TBC1 domain family member 1 and 4 (TBC1D1 and TBC1D4), in addition to a variety of signaling molecules, such as GTPases, Rab and soluble N-ethylmaleimide-sensitive factor attached protein receptor (SNARE) proteins. These pathways promote greater translocation of GLUT4 and consequent glucose uptake by the skeletal muscle. Phosphoinositide-dependent kinase (PDK), atypical protein kinase C (aPKC) and some of its isoforms, such as PKC-iota/lambda also seem to play a fundamental role in the transport of glucose. In this sense, the association between autophagy and exercise has also demonstrated a relevant role in the uptake of muscle glucose. Insulin, in turn, uses a phosphoinositide 3-kinase (PI3K)-dependent mechanism, while exercise signal may be triggered by the release of calcium from the sarcoplasmic reticulum. The objective of this review is to describe the main molecular mechanisms of IR and the relationship between PE and glucose uptake.

Resumo Contexto A obesidade pode estar relacionada a doenças como diabetes, hipertensão arterial e dislipidemia. A cirurgia bariátrica é um dos tratamentos mais eficazes, levando à diminuição de peso e comorbidades. Objetivo Avaliar o perfil metabólico e farmacoterapêutico de pacientes obesos após cirurgia bariátrica. Métodos Trata-se de um estudo observacional transversal retrospectivo, realizado em um hospital localizado na cidade de Porto Alegre, RS, Brasil. Foram avaliados 70 prontuários de pacientes que realizaram cirurgia bariátrica, nos períodos de antes de 2 meses e mais de 6 meses após a cirurgia bariátrica. A análise estatística foi realizada no programa SPSS 17.0®. Resultados A pressão arterial inicial foi de 130/85 mmHg, passando para 120/80 mmHg (p < 0,01). Com relação ao perfil metabólico antes de dois meses, o HDL foi de 34 mg/dL, o colesterol total foi de 195,07 ± 40,17 mg/dL, o LDL foi de 118,22 ± 41,28 mg/dL, os triglicerídeos foram de 141,09 ± 43,39 mg/dL, e a glicemia de jejum foi de 90 mg/dL. Após 6 meses de cirurgia, os valores passaram para 43 mg/dL, 133,67 ± 28,14 mg/dL, 65,53 ± 24,3 mg/dL, 104,41 ± 29,6 mg/dL, e 77 mg/dL, respectivamente (p < 0,01). Com relação ao uso de medicamentos, 41% utilizaram anti-hipertensivos, 39% utilizaram hipolipemiantes, 10% utilizaram hipoglicemiantes orais e 97% utilizaram suplementos antes dos 2 meses de cirurgia. Após os 6 meses, os percentuais foram alterados para 21%, 19%, 9% e 99%, respectivamente. Conclusões O estudo mostra o sucesso da cirurgia bariátrica em pacientes obesos com comorbidades, revelando melhora no perfil metabólico e redução na utilização de medicamentos para tratamento de comorbidades.

Abstract Background Obesity can be associated with diseases such as diabetes, arterial hypertension and dyslipidemia. Bariatric surgery is one of the most effective treatments available, reducing both weight and comorbidities. Objective To evaluate the metabolic and pharmacotherapeutic profile of obese patients after bariatric surgery. Methods This is a retrospective, cross-sectional, observational study conducted at a hospital located in the city of Porto Alegre, RS, Brazil, based on analysis of the medical records for 70 patients who underwent bariatric surgery covering periods spanning from 2 months prior to more than 6 months after their bariatric surgery. Statistical analysis was conducted using SPSS 17.0®. Results Initial arterial blood pressure was 130/85 mmHg, 6 months after surgery it was 120/80 mmHg (p < 0.01). The metabolic profile 2 months before surgery was as follows: HDL was 34 mg/dL, total cholesterol was 195.07 ± 40.17 mg/dL, LDL was 118.22 ± 41.28 mg/dL, triglycerides were 141.09 ± 43.39 mg/dL, and fasting glycemia was 90 mg/dL. The same figures 6 months after surgery were 43 mg/dL, 133.67 ± 28.14 mg/dL, 65.53 ± 24.3 mg/dL, 104.41 ± 29.6 mg/dL, and 77 mg/dL, respectively (p < 0.01). Use of medications 2 months before surgery was as follows: 41% were on antihypertensives, 39% on hypolipidemics, 10% on oral hypoglycemics, and 97% were on nutritional supplements. These percentages 6 months after surgery had changed to 21%, 19%, 9% and 99%, respectively. Conclusions This study illustrates that bariatric surgery for obese patients with comorbidities was successful, demonstrating improvements in their metabolic profile and reductions in use of medications used to treat comorbidities.

OBJETIVO: Avaliar a proporção de sobrepeso/obesidade e alterações em parâmetros bioquímicos sangüíneos em pacientes com esquizofrenia do sexo masculino, usuários de medicação antipsicótica (clozapina). MÉTODOS: Estudo transversal com 40 pacientes do sexo masculino, diagnosticados com esquizofrenia, em uso de clozapina, atendidos no Hospital de Clínicas de Porto Alegre. Foram verificadas as relações entre o índice de massa corporal, a circunferência abdominal, o percentual de gordura corporal, o perfil lipídico e o exame de glicose de jejum e a dosagem da medicação, o acompanhamento dietoterápico e a monoterapia de clozapina. RESULTADOS: Os pacientes apresentaram freqüências de 71,8% de sobrepeso/obesidade, 76,9% de circunferência abdominal aumentada e 94,1% de percentual de gordura elevada. Foram encontrados 56,8% de pacientes com lipoproteína de baixa densidade-colesterol acima do normal e 64,1% com triglicerídeos elevados. Quanto maior a dosagem de clozapina utilizada maiores foram os níveis de lipoproteína de baixa densidade-colesterol (p=0,01). CONCLUSÃO: Pacientes tratados com clozapina apresentam aumento de peso e significante anormalidade lipídica, necessitando de monitoramento freqüente dos níveis plasmáticos e intervenção nutricional precoce, visando à otimização do tratamento.

OBJECTIVE: The objective was to access the overweight/obesity rates and variations of biochemical blood parameters in male schizophrenic outpatients taking antipsychotic medication (clozapine), treated at the Schizophrenia and Dementia First Aid Station of the Clinics Hospital in Porto Alegre. METHODS: This is a cross-sectional study with 40 male outpatients diagnosed with schizophrenia and taking clozapine, from the Clinics Hospital in Porto Alegre. Associations between body mass index, waist circumference, body fat percentage, lipid levels and fasting glucose and medication dosage, diet therapy and clozapine monotherapy were verified. RESULTS: There was a rate of 71.8% of overweight/obesity, 76.9% of increased waist circumference and 94.1% of high body fat percentage. More than half of the patients (56.8%) had low density lipoprotein cholesterol levels above normal and 64.1% had high triglycerides. LDL-cholesterol levels increased with increasing clozapine dose (p=0.01). CONCLUSION: Patients on clozapine presented excess weight and significant lipid abnormality, needing frequent monitoring of the biochemical blood parameters and early nutritional intervention to optimize treatment.