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1.
Cien Saude Colet ; 29(2): e01942023, 2024 Feb.
Article in Portuguese, English | MEDLINE | ID: mdl-38324818

ABSTRACT

The aim of this study was to investigate the association between maternal and paternal licit and illicit drug use, smoking and drinking and autism spectrum disorder (ASD). We conducted a case-control study with children and adolescents diagnosed with ASD and neurotypical individuals. The data were collected using a semi-structured questionnaire administered during interviews with the children's mothers or guardians. The following variables were analyzed: child sex and age; maternal and parental age; use of medicines before and during pregnancy; classes of medicines used during pregnancy; maternal and paternal smoking; maternal and paternal drinking; maternal and paternal illicit drug use. The data were analyzed using logistic regression and crude and adjusted odds ratios (OR). After adjustment, the results showed an association between maternal use of antipyretics/pain killers during pregnancy (OR = 2.26; 95%CI 1.29-3.95; p < 0.040) and ASD. No association was found between maternal and paternal smoking, drinking and illicit drug use before and during pregnancy and ASD. The findings suggest that the development of ASD is influenced by environmental factors.


O presente estudo objetivou investigar a associação entre o TEA e o uso materno e paterno de medicamentos, tabaco, álcool e drogas ilícitas. Trata-se de um estudo caso-controle realizado com crianças e adolescentes diagnosticados com TEA e indivíduos neurotípicos. Os dados foram colhidos por meio de entrevista com as mães ou responsáveis. Foram analisadas as variáveis sexo e idade das crianças/adolescentes; idade dos pais; uso de medicamentos antes e durante a gestação; classes de medicamentos usados na gestação; tabagismo materno e paterno; etilismo materno e paterno; uso de drogas ilícitas pelos pais. Para a análise das informações, utilizou-se o modelo de regressão logística, além da razão de chances (OR) bruta e ajustada. Os resultados mostraram que, após os ajustes, foi encontrada associação entre o uso materno na gestação de antitérmicos/analgésicos (OR = 2,26; IC95% 1,29-3,95; p < 0,040) com o TEA. Já o uso de tabaco, álcool e drogas ilícitas materno e paterno, antes e durante a gestação, não apontou relação com o TEA. Os dados encontrados sugerem que existe influência de fatores ambientais no desenvolvimento do TEA.


Subject(s)
Autism Spectrum Disorder , Illicit Drugs , Humans , Pregnancy , Child , Female , Adolescent , Risk Factors , Case-Control Studies , Autism Spectrum Disorder/epidemiology , Autism Spectrum Disorder/etiology , Smoking/epidemiology
2.
Ciênc. Saúde Colet. (Impr.) ; 29(2): e01942023, 2024. tab, graf
Article in Portuguese | LILACS-Express | LILACS | ID: biblio-1528351

ABSTRACT

Resumo O presente estudo objetivou investigar a associação entre o TEA e o uso materno e paterno de medicamentos, tabaco, álcool e drogas ilícitas. Trata-se de um estudo caso-controle realizado com crianças e adolescentes diagnosticados com TEA e indivíduos neurotípicos. Os dados foram colhidos por meio de entrevista com as mães ou responsáveis. Foram analisadas as variáveis sexo e idade das crianças/adolescentes; idade dos pais; uso de medicamentos antes e durante a gestação; classes de medicamentos usados na gestação; tabagismo materno e paterno; etilismo materno e paterno; uso de drogas ilícitas pelos pais. Para a análise das informações, utilizou-se o modelo de regressão logística, além da razão de chances (OR) bruta e ajustada. Os resultados mostraram que, após os ajustes, foi encontrada associação entre o uso materno na gestação de antitérmicos/analgésicos (OR = 2,26; IC95% 1,29-3,95; p < 0,040) com o TEA. Já o uso de tabaco, álcool e drogas ilícitas materno e paterno, antes e durante a gestação, não apontou relação com o TEA. Os dados encontrados sugerem que existe influência de fatores ambientais no desenvolvimento do TEA.


Abstract The aim of this study was to investigate the association between maternal and paternal licit and illicit drug use, smoking and drinking and autism spectrum disorder (ASD). We conducted a case-control study with children and adolescents diagnosed with ASD and neurotypical individuals. The data were collected using a semi-structured questionnaire administered during interviews with the children's mothers or guardians. The following variables were analyzed: child sex and age; maternal and parental age; use of medicines before and during pregnancy; classes of medicines used during pregnancy; maternal and paternal smoking; maternal and paternal drinking; maternal and paternal illicit drug use. The data were analyzed using logistic regression and crude and adjusted odds ratios (OR). After adjustment, the results showed an association between maternal use of antipyretics/pain killers during pregnancy (OR = 2.26; 95%CI 1.29-3.95; p < 0.040) and ASD. No association was found between maternal and paternal smoking, drinking and illicit drug use before and during pregnancy and ASD. The findings suggest that the development of ASD is influenced by environmental factors.

3.
Rev. Bras. Saúde Mater. Infant. (Online) ; 24: e20220340, 2024. tab, graf
Article in English | LILACS | ID: biblio-1535105

ABSTRACT

Abstract Objectives: to evaluate the association between breastfeeding and Autism Spectrum Disorder (ASD) in children and adolescents. Methods: this is a case-control study carried out in the north of the state of Minas Gerais, Brazil, which included 248 children and adolescents diagnosed with ASD (case group) and 886 children and adolescents without a diagnosis of ASD (control group).Interviews were conducted with the mothers of children and adolescents and a semi-structured questionnaire was used to collect data. For data analysis, a multiple logistic regression model was adopted. The magnitude of associations was estimated by the odds ratio (OR). Three multiple models were fitted: Model 1: presence or absence of breastfeeding; Model 2: duration of breastfeeding; Model 3: duration of exclusive breastfeeding. Results: ASD was associated with the absence of breastfeeding in the three adjusted models: Model 1: OR=2.1, CI95%=1.1-4.1; Model 2: OR=2.3, CI95%=1.2-4.5; Model 3: OR=2.3, CI95%=1.2-4.5. Conclusions: individuals with ASD were more likely to have not received breastfeeding, however, due to the nature of case control studies, it cannot be stated that breastfeeding prevents ASD. Conducting a cohort study may clarify this relationship.


Resumo Objetivos: avaliar a associação entre aleitamento materno e Transtorno do Espectro do Autismo (TEA) em crianças e adolescentes. Métodos: trata-se de um estudo caso-controle realizado no norte de Minas Gerais, Brasil, que incluiu 248 crianças e adolescentes com diagnóstico de TEA (grupo caso) e 886 crianças e adolescentes sem diagnóstico de TEA (grupo controle). Foram realizadas entrevistas com as mães das crianças e adolescentes e utilizado um questionário semiestruturado para coleta dos dados. Para análise dos dados foi adotado modelo de regressão logística múltipla. A magnitude das associações foi estimada pela Odds Ratio (OR). Três modelos múltiplos foram ajustados: Modelo 1: presença ou ausência de aleitamento materno; Modelo 2: duração do aleitamento materno; Modelo 3: duração do aleitamento materno exclusivo. Resultados: o TEA foi associado à ausência de aleitamento materno nos três modelos ajustados: Modelo 1: OR=2,1, IC95%=1,1-4,1; Modelo 2: OR=2,3, IC95%=1,2-4,5; Modelo 3: OR=2,3, IC95%=1,2-4,5. Conclusões: os indivíduos com TEA tiveram maiores chances de não terem recebido aleitamento materno, no entanto, devido à natureza dos estudos de caso-controle, não se pode afirmar que o aleitamento materno previna o TEA. A realização de um estudo de coorte poderá esclarecer essa relação.


Subject(s)
Humans , Child , Adolescent , Breast Feeding , Odds Ratio , Autism Spectrum Disorder , Brazil , Case-Control Studies , Risk Factors
4.
Estud. Psicol. (Campinas, Online) ; 40: e200242, 2023. tab, graf
Article in English | LILACS, Index Psychology - journals | ID: biblio-1440119

ABSTRACT

Objective: A cross-sectional study that estimated the prevalence of Internet Addiction and associated factors among High School and College students in Montes Claros - Minas Gerais, Brazil. Methods: Internet Addiction was evaluated through the Internet Addiction Test, and demographic, socioeconomic, and lifestyle factors, as well as internet usage profile characteristics, were examined. Descriptive analysis and the Poisson regression model were applied. Results: Of the 2,519 participants, 52.3% were considered with Internet Addiction Problems. In High School, the following factors were identified: are women and girls, age over >16, class C, alcohol consumption, impaired sleep, frequent use of social networks, and time spent connected. In Higher Education, the following factors: are women and girls, age over >23, paid activity, class C and D/E, alcohol consumption, impaired sleep, imbalanced diet, frequent use of social networks, and time spent connected. Conclusion: There was an expressive prevalence of Internet Addiction Problems, an outcome associated with the demographic, socioeconomic, lifestyle, and internet use characteristics.


Objetivo: Estudo transversal que estimou prevalência de Adicção em Internet e fatores associados entre estudantes do Ensino Médio e Superior em Montes Claros - Minas Gerais, Brasil. Métodos: A Adicção em Internet foi avaliada pelo Internet Addiction Test e se investigaram fatores demográficos, socioeconômicos, estilo de vida e perfil de uso de internet. Foram realizadas análises descritivas e modelo de regressão de Poisson. Resultados: Dos 2.519 participantes, 52,3% apresentaram problemas de Adicção em Internet. No grupo de estudantes de Ensino Médio examinado, identificaram-se os seguintes fatores: sexo feminino, idade >16, classe C, consumo de álcool, sono prejudicado, uso frequente das redes sociais e tempo de conexão. No Ensino Superior, foram constatados: sexo feminino, idade >23, atividade remunerada, classe C e D/E, consumo de álcool, sono prejudicado, alimentação não balanceada, uso frequente das redes sociais e tempo de conexão. Conclusão: Houve expressiva prevalência de Problemas com Adicção em Internet, desfecho associado a características demográficas, socioeconômicas, ao estilo de vida e ao uso da internet.


Subject(s)
Epidemiologic Studies , Student Health , Behavior, Addictive , Internet
5.
Rev. Paul. Pediatr. (Ed. Port., Online) ; 41: e2021220, 2023. tab, graf
Article in English | LILACS-Express | LILACS | ID: biblio-1387514

ABSTRACT

Abstract Objective: To assess the association between peripartum events and autism spectrum disorder (ASD) development in children and adolescents. Methods: The current research is a case-control study in northern Minas Gerais state, Brazil. The inclusion criteria in the case group included individuals whose medical records reported an autistic disorder diagnosis, individuals had this diagnosis further confirmed by Northern Minas Autistic Support Association and specialized clinics, and their mothers had to answer positively to the question: "Was your child diagnosed with autism spectrum disorder?" in the data collection instrument. Thus, the case group included 253 mothers of children/adolescents of 2-15 years old diagnosed with autism. The inclusion criteria in the control group included 852 individuals belonging to the same age group and enrolled in the same schools as the case group. A semi-structured questionnaire was applied for mothers of children/adolescents, and the multiple logistic regression model was adopted for data analysis. Gross and adjusted Odds Ratios (ORa) were used to estimate the magnitude of the associations. Results: Autistic disorder was associated with the presence of meconium in amniotic fluid (AF) (ORa 1.67; 95% confidence interval [95%CI] 1.06-2.65) and cesarean delivery type (ORa 1.65; 95%CI 1.17-2.32). Emergency cesarean section increased autistic disorder development likelihood (ORa 2.38; 95%CI 1.61-3.51). Children and adolescents with ASD were more likely to have been exposed to two or more unfavorable peripartum events and obstetric complications than control groups (ORa 1.59; 95%CI 1.01-2.51). Conclusions: Meconium stained amniotic fluid, delivery by cesarean, and two or more unfavorable peripartum events are variables that should be considered in studies about ASD etiology.


RESUMO Objetivo: Avaliar a associação entre os eventos periparto e o desenvolvimento do transtorno do espectro autista (TEA) em crianças/adolescentes. Métodos: Trata-se de um estudo de caso-controle desenvolvido no norte de Minas Gerais, Brasil. Os critérios de inclusão do grupo caso foram indivíduos com diagnóstico de TEA por laudo médico, confirmado pela Associação Norte Mineira de Apoio ao Autista ou por clínicas especializadas, e as mães que responderam positivamente a: "Seu filho foi diagnosticado com TEA?". Assim, o grupo caso incluiu 253 mães de crianças/adolescentes com 2-15 anos diagnosticadas com autismo. O critério de inclusão no grupo controle abrangeu 852 indivíduos pertencentes à mesma faixa etária e matriculados nas mesmas escolas que o grupo caso. Um questionário semiestruturado foi aplicado às mães e o modelo de regressão logística múltipla foi adotado para a análise de dados. Para estimar a magnitude das associações, utilizou-se Odds Ratio (OR) bruta e ajustada. Resultados: O TEA foi associado à presença de mecônio no líquido amniótico (ORa 1,67; intervalo de confiança [IC95%] 1,06-2,65) e ao parto cesáreo (ORa 1,65; IC95% 1,17-2,32). A cesárea de emergência aumentou a chance de desenvolvimento do autismo (ORa 2,38; IC95% 1,61-3,51). Crianças/adolescentes com autismo apresentaram maior chance de exposição a dois ou mais eventos desfavoráveis de parto (ORa 1,59; IC95% 1,01-2,51). Conclusões: A presença de mecônio no líquido amniótico, cesárea de emergência e mais de um evento de parto desfavorável são fatores que devem ser considerados nos estudos sobre a etiologia do transtorno autístico.

6.
Rev Paul Pediatr ; 41: e2021220, 2022.
Article in English | MEDLINE | ID: mdl-35830161

ABSTRACT

OBJECTIVE: To assess the association between peripartum events and autism spectrum disorder (ASD) development in children and adolescents. METHODS: The current research is a case-control study in northern Minas Gerais state, Brazil. The inclusion criteria in the case group included individuals whose medical records reported an autistic disorder diagnosis, individuals had this diagnosis further confirmed by Northern Minas Autistic Support Association and specialized clinics, and their mothers had to answer positively to the question: "Was your child diagnosed with autism spectrum disorder?" in the data collection instrument. Thus, the case group included 253 mothers of children/adolescents of 2-15 years old diagnosed with autism. The inclusion criteria in the control group included 852 individuals belonging to the same age group and enrolled in the same schools as the case group. A semi-structured questionnaire was applied for mothers of children/adolescents, and the multiple logistic regression model was adopted for data analysis. Gross and adjusted Odds Ratios (ORa) were used to estimate the magnitude of the associations. RESULTS: Autistic disorder was associated with the presence of meconium in amniotic fluid (AF) (ORa 1.67; 95% confidence interval [95%CI] 1.06-2.65) and cesarean delivery type (ORa 1.65; 95%CI 1.17-2.32). Emergency cesarean section increased autistic disorder development likelihood (ORa 2.38; 95%CI 1.61-3.51). Children and adolescents with ASD were more likely to have been exposed to two or more unfavorable peripartum events and obstetric complications than control groups (ORa 1.59; 95%CI 1.01-2.51). CONCLUSIONS: Meconium stained amniotic fluid, delivery by cesarean, and two or more unfavorable peripartum events are variables that should be considered in studies about ASD etiology.


Subject(s)
Autism Spectrum Disorder , Autistic Disorder , Adolescent , Autism Spectrum Disorder/epidemiology , Autism Spectrum Disorder/etiology , Autistic Disorder/complications , Case-Control Studies , Cesarean Section , Child , Child, Preschool , Female , Humans , Peripartum Period , Pregnancy
7.
Int J Infect Dis ; 104: 732-733, 2021 Mar.
Article in English | MEDLINE | ID: mdl-33582367

ABSTRACT

Coronavirus 2019 (COVID-19), caused by the pathogen SARS-CoV-2, was declared a pandemic in March 2020. Recently, studies have discussed reports of patients infected with COVID-19 associated with vesicular manifestations of Herpes Zoster. The objective of this study was to compare the data from the Unified Health System (SUS) on the number of diagnoses of Herpes Zoster from March to August from 2017 to 2019, with the same period in 2020, in the five Brazilian regions (North, Northeast, Southeast, South, and Midwest). The data were extracted from the public database (DATASUS) of Brazil's Ministry of Health. The data showed an increase in the number of Herpes Zoster diagnoses over the years and the negative impact from the COVID-19 disease, revealing an average increase corresponding to an extra 10.7 cases per million inhabitants during the pandemic in all Brazilian Regions. Therefore, although the association between HZ and COVID-19 is not well established, we observed in this study an increase in HZ cases during the COVID -19 pandemic, which suggests a correlation between these diseases.


Subject(s)
COVID-19/epidemiology , Herpes Zoster/epidemiology , SARS-CoV-2 , Brazil/epidemiology , Humans
8.
Protein Pept Lett ; 28(7): 750-760, 2021.
Article in English | MEDLINE | ID: mdl-33511924

ABSTRACT

The use of medicinal plants as a therapy alternative is old as human existence itself. Nowadays, the search for effective molecules for chronic diseases treatments has increased. The cardiometabolic disorders still the main cause of death worldwide and plants may offer potential pharmacological innovative approaches to treat and prevent diseases. In the range of plant molecules are inserted the terpenes, which constituent essential elements with several pharmacological characteristics and applications, including cardiovascular and metabolic properties. Thus, the aim of the present review is to update the terpenes use on chronic disorders such as obesity, diabetes, hypertension and vascular conditions. The review includes a brief terpenes description based on the scientific literature in addition to data collected from secondary sources such as books and conference proceedings. We concluded that terpenes could act as adjuvant or main alternative treatment (when started earlier) to improve cardiometabolic diseases, contributing to reduce side effects of conventional drugs, in addition to preserving ethnopharmacological knowledge.


Subject(s)
Anti-Inflammatory Agents/therapeutic use , Atherosclerosis/drug therapy , Cardiovascular Agents/therapeutic use , Diabetes Mellitus/drug therapy , Hypertension/drug therapy , Obesity/drug therapy , Terpenes/therapeutic use , Animals , Anti-Inflammatory Agents/chemistry , Anti-Inflammatory Agents/classification , Anti-Inflammatory Agents/isolation & purification , Atherosclerosis/metabolism , Atherosclerosis/pathology , Cardiovascular Agents/chemistry , Cardiovascular Agents/classification , Cardiovascular Agents/isolation & purification , Chemotherapy, Adjuvant/methods , Diabetes Mellitus/metabolism , Diabetes Mellitus/pathology , Disease Models, Animal , Ethnopharmacology/methods , Humans , Hypertension/metabolism , Hypertension/pathology , Obesity/metabolism , Obesity/pathology , Plant Extracts/chemistry , Plants, Medicinal , Stereoisomerism , Terpenes/chemistry , Terpenes/classification , Terpenes/isolation & purification
9.
J Nutr Biochem ; 84: 108413, 2020 10.
Article in English | MEDLINE | ID: mdl-32619905

ABSTRACT

Obesity is a chronic multifactorial disease and is currently a public health problem. Maternal obesity during pregnancy is more dangerous as it impairs the health of the mother and future generations. Obesity leads to several metabolic disorders. Since white adipose tissue is an endocrine tissue, obesity often leads to disordered secretion of inflammatory, glycemic, lipid and renin-angiotensin system (RAS) components. The RAS represents a link between obesity and its metabolic consequences. Therefore, our goal was to evaluate the possible changes caused by a high-fat diet in RAS-related receptor expression in the uterus and placenta of pregnant mice and determine the underlying effects of these changes in the fetuses' body composition. Breeding groups were formed after obesity induction by high-fat (HF) diet. Dams and fetuses were euthanized on the 19th day of the gestational period. The HF diet effectively induced obesity, glucose intolerance and insulin resistance in mice. Fetuses born from HF dams showed increased body weight and adiposity. Both results were accompanied by increased AT1R expression in placenta and uterus together with increased angiotensin-converting enzyme expression in the uterus and a decreased expression of MAS1 in placenta of HF dams. These results suggest a link between RAS, maternal obesity induced by HF diet and the fetuses' body adiposity. This new path now can be more thoroughly explored.


Subject(s)
Adiposity , Obesity, Maternal/metabolism , Renin-Angiotensin System , Animals , Animals, Newborn , Body Composition , Body Weight , Female , Fetus/metabolism , Glucose Tolerance Test , Insulin Resistance , Maternal Nutritional Physiological Phenomena , Mice , Mice, Inbred C57BL , Pregnancy , Proto-Oncogene Mas
10.
Aging Clin Exp Res ; 32(5): 907-912, 2020 May.
Article in English | MEDLINE | ID: mdl-31332739

ABSTRACT

BACKGROUND: Single- and dual-tasks are influenced by age-related impaired postural balance. Aim of this study was to analyze the Center of Pressure (CoP) oscillation during static balance in the presence or absence of cognitive task on older women. METHODS: Thirty-one healthy older women were assessed in a stand quiet position with open/closed eyes (single-task, OE and CE) and with cognitive task (dual-task, DT) through Wii Balance Board. Sway area, total displacement and CoP oscillation (CO) based on the number of times that CoP traveled through anteroposterior and mediolateral directions. Friedman test was used to compare OE, CE and DT. Dual-task interference percentage was used to quantify the cognitive load on balance whereas Spearman correlation coefficient was used to assess the association of cognitive domains and CO. RESULTS: The CO was significantly higher in DT than in single-tasks and participants were unable to maintain their limits of stability in mediolateral direction. The cost of DT interference was 30.5%, which is partially explained by the deviation of attention from postural control to spatial and temporal orientation. CONCLUSION: Our findings show that cognitive load during DT impairs balance in mediolateral direction, thus indicating the use of WBB to assess cognitive interference on postural control.


Subject(s)
Cognition , Aged , Attention , Female , Humans , Middle Aged , Postural Balance , Task Performance and Analysis
12.
J Steroid Biochem Mol Biol ; 155(Pt A): 1-8, 2016 Jan.
Article in English | MEDLINE | ID: mdl-26386462

ABSTRACT

OBJECTIVES: Glucocorticoid treatment induces insulin resistance (IR), which is counteracted by a compensatory hyperinsulinemia, due to increased pancreatic ß-cell function. There is evidence for also reduced hepatic insulin clearance, but whether this correlates with altered activity of insulin-degrading enzyme (IDE) in the liver, is not fully understood. Here, we investigated whether hyperinsulinemia, in glucocorticoid-treated rodents, is associated with any alteration in the insulin clearance and activity of the IDE in the liver. MATERIALS/METHODS: Adult male Swiss mice and Wistar rats were treated with the synthetic glucocorticoid dexamethasone intraperitoneally [1mg/kg body weight (b.w.)] for 5 consecutive days. RESULTS: Glucocorticoid treatment induced IR and hyperinsulinemia in both species, but was more impactful in rats that also displayed glucose intolerance and hyperglycemia. Insulin clearance was reduced in glucocorticoid-treated rats and mice, as judged by the reduction of insulin decay rate and increased insulin area-under-the-curve (47% and 87%, respectively). These results were associated with reduced activity (35%) of hepatic IDE in rats and a tendency to reduction (p=0.068) in mice, without alteration in hepatic IDE mRNA content, in both species. CONCLUSION: In conclusion, the reduced insulin clearance in glucocorticoid-treated rodents was due to the reduction of hepatic IDE activity, at least in rats, which may contributes to the compensatory hyperinsulinemia. These findings corroborate the idea that short-term and/or partial inhibition of IDE activity in the liver could be beneficial for the glycemic control.


Subject(s)
Dexamethasone/adverse effects , Hyperinsulinism/chemically induced , Insulin/metabolism , Insulysin/metabolism , Animals , Dexamethasone/pharmacology , Glucocorticoids/adverse effects , Glucocorticoids/pharmacology , Glucose Tolerance Test , Hyperinsulinism/metabolism , Insulin Resistance , Insulysin/genetics , Liver/drug effects , Liver/metabolism , Male , Mice , Rats, Wistar
14.
J Nutr Biochem ; 26(5): 556-62, 2015 May.
Article in English | MEDLINE | ID: mdl-25736482

ABSTRACT

Protein restriction in the early stages of life can result in several changes in pancreatic function. These alterations include documented reductions in insulin secretion and in cytoplasmic calcium concentration [Ca(2+)]i. However, the mechanisms underlying these changes have not been completely elucidated and may result, in part, from alterations in signaling pathways that potentiate insulin secretion in the presence of glucose. Our findings suggest that protein restriction disrupts the insulin secretory synergism between Cyclic adenosine monophosphate (cAMP)-dependent protein kinase (PKA) and Ca(2+)-dependent protein kinase C (PKC) in isolated islets. Western blot analysis demonstrated reduced levels of both phospho-cAMP response element-binding protein (phospho-CREB) at Ser-133 and substrates phosphorylated by PKCs (Phospho-(Ser) PKC substrate), suggesting that PKA and PKC activity was impaired in islets from rats fed a low-protein diet (LP). cAMP levels and global Ca(2+) entry were also reduced in LP islets. In summary, our findings showed that protein restriction altered the crosstalk between PKA and PKC signaling pathways, resulting in the alteration of secretory synergism in isolated islets.


Subject(s)
Cyclic AMP-Dependent Protein Kinases/metabolism , Diet, Protein-Restricted , Islets of Langerhans/metabolism , Protein Kinase C/metabolism , Signal Transduction , Animals , In Vitro Techniques , Islets of Langerhans/enzymology , Male , Rats , Rats, Wistar
15.
Mol Metab ; 3(4): 484-9, 2014 Jul.
Article in English | MEDLINE | ID: mdl-24944908

ABSTRACT

Ca(2+)/calmodulin-dependent protein kinase II (CaMKII) functions both in regulation of insulin secretion and neurotransmitter release through common downstream mediators. Therefore, we hypothesized that pancreatic ß-cells acquire and store the information contained in calcium pulses as a form of "metabolic memory", just as neurons store cognitive information. To test this hypothesis, we developed a novel paradigm of pulsed exposure of ß-cells to intervals of high glucose, followed by a 24-h consolidation period to eliminate any acute metabolic effects. Strikingly, ß-cells exposed to this high-glucose pulse paradigm exhibited significantly stronger insulin secretion. This metabolic memory was entirely dependent on CaMKII. Metabolic memory was reflected on the protein level by increased expression of proteins involved in glucose sensing and Ca(2+)-dependent vesicle secretion, and by elevated levels of the key ß-cell transcription factor MAFA. In summary, like neurons, human and mouse ß-cells are able to acquire and retrieve information.

16.
J Endocrinol ; 208(3): 257-64, 2011 Mar.
Article in English | MEDLINE | ID: mdl-21212094

ABSTRACT

Endurance exercise is known to enhance peripheral insulin sensitivity and reduce insulin secretion. However, it is unknown whether the latter effect is due to the reduction in plasma substrate availability or alterations in ß-cell secretory machinery. Here, we tested the hypothesis that endurance exercise reduces insulin secretion by altering the intracellular energy-sensitive AMP-activated kinase (AMPK) signaling pathway. Male Wistar rats were submitted to endurance protocol training one, three, or five times per week, over 8 weeks. After that, pancreatic islets were isolated, and glucose-induced insulin secretion (GIIS), glucose transporter 2 (GLUT2) protein content, total and phosphorylated calmodulin kinase kinase (CaMKII), and AMPK levels as well as peroxisome proliferator-activated receptor-γ coactivator-1-α (PGC-1α) and uncoupling protein 2 (UCP2) content were measured. After 8 weeks, chronic endurance exercise reduced GIIS in a dose-response manner proportionally to weekly exercise frequency. Contrariwise, increases in GLUT2 protein content, CaMKII and AMPK phosphorylation levels were observed. These alterations were accompanied by an increase in UCP2 content, probably mediated by an enhancement in PGC-1α protein expression. In conclusion, chronic endurance exercise induces adaptations in ß-cells leading to a reduction in GIIS, probably by activating the AMPK signaling pathway.


Subject(s)
AMP-Activated Protein Kinases/metabolism , Insulin/metabolism , Ion Channels/metabolism , Islets of Langerhans/metabolism , Mitochondrial Proteins/metabolism , Physical Conditioning, Animal , Physical Endurance , Animals , Calcium-Calmodulin-Dependent Protein Kinase Type 2/metabolism , Glucose Transporter Type 2/metabolism , Insulin Secretion , Male , Muscle, Skeletal/metabolism , Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha , RNA-Binding Proteins/metabolism , Rats , Rats, Wistar , Transcription Factors/metabolism , Uncoupling Protein 2
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