Effects of starvation and refeeding cycles on spermatogenesis and sex steroids in the Nile tilapia Oreochromis niloticus.

Food restriction is part of the life cycle of many fish species; however, nutritional deficiency may negatively influence gametogenesis and gonadal maturation. The aim of this study was to evaluate the effects of food restriction on the spermatogenesis of Nile tilapia. For this, adult males were submitted to starvation and refeeding cycles (alternating periods of starvation and feeding) for 7, 14, 21, and 28 days. After 7 days of starvation, glycaemic and lipid levels were significantly reduced, followed by reduction of plasma testosterone (T) and 11-ketotestosterone (11-KT). In addition, reduced proliferation of spermatogonia and increased apoptosis of spermatocytes, spermatids, and spermatozoa was observed in starvation groups. In the refeeding groups, the sex steroids and the proportion of germ cells had no significant alterations compared to the control group, except for spermatozoa. In this sense, the present study suggests that starvation after 7 days progressively reduces T and 11-TK, resulting in damage to the production of spermatogenic cells, while refeeding may delay spermatogenesis but does not lead to testicular impairment.

Coma irreversível em paciente portadora de esquizofrenia paranóide: encefalopatia de Wernicke após síndrome de realimentação: um relato de caso / Irreversible coma in a patient with paranoid schizophrenia: Wernicke encephalopathy after refeeding syndrome: a case report

Encefalopatia de Wernicke (EW) e síndrome de realimentação (SR) são duas condições frequentemente coexistentes, subdiagnosticadas e que podem implicar prognóstico reservado após sua instalação. Sua identificação precoce representa um desafio para os intensivistas, haja vista a falta de sensibilidade e especificidade das manifestações clínicas. Apresenta-se um relato de caso de uma paciente portadora de esquizofrenia paranoide, sem histórico de abuso de álcool, que desenvolveu quadro de coma irreversível após greve de fome, sendo feito diagnóstico tardio de EW associada a SR. Descreve-se a evolução clínica e neuropsiquiátrica com o intuito de enfatizar a necessidade crucial de alta suspeição diagnóstica, com reposição vitamínica imediata, vigilância de distúrbios eletrolíticos e progressão parcimoniosa do aporte nutricional. (AU)

Wernicke encephalopathy (WE) and refeeding syndrome (RFS) are two often coexisting, underdiagnosed conditions that may involve a poor prognosis after their onset. Early identification represents a challenge for intensivists, given the lack of sensitivity and specificity of clinical manifestations. We report a case of a patient with paranoid schizophrenia, without a history of alcohol abuse, who developed irreversible coma after a hunger strike, with a late diagnosis of WE associated with RFS. The clinical and neuropsychiatric outcomes are described herein in order to emphasize the crucial need for a high diagnostic suspicion, with immediate vitamin replacement, monitoring of electrolyte disorders, and gradual progression of nutritional support. (AU)

Morphological changes of gonad and gene expression patterns during desexualization in Dugesia japonica (Platyhelminthes: Dugesiidae)

Planarians, the representatives of an ancient bilaterian group with complex reproductive system and high regenerative capabilities, are model system suitable for studying the basic molecular requirements for the development of the reproductive system. To further explore the morphological changes of the gonads during desexualization and the molecular events of the genes controlling the reproductive system development in planarians, we have investigated the histological changes of ovary and testis by paraffin section and the expression patterns of reproductive-related genes by the quantitative real-time PCR in Dugesia japonica Ichikawa & Kawakatsu, 1964, upon starvation. The four genes, Djprps, DjvlgA, DjvlgB and Djnos, have been selected. The research results show that the degradation of ovary changes from outside layer to inside, and the testis changes are opposite; the reproductive capacity of the planarians starts to be damaged from the 17th to 25th days and to disappear completely from the 26th to 37th days during starvation. The expression patterns of the four genes exhibit the obvious dynamic variations during their desexualization, which indicates that these genes might be involved in gonad development.(AU)

Morphological changes of gonad and gene expression patterns during desexualization in Dugesia japonica (Platyhelminthes: Dugesiidae)

Planarians, the representatives of an ancient bilaterian group with complex reproductive system and high regenerative capabilities, are model system suitable for studying the basic molecular requirements for the development of the reproductive system. To further explore the morphological changes of the gonads during desexualization and the molecular events of the genes controlling the reproductive system development in planarians, we have investigated the histological changes of ovary and testis by paraffin section and the expression patterns of reproductive-related genes by the quantitative real-time PCR in Dugesia japonica Ichikawa & Kawakatsu, 1964, upon starvation. The four genes, Djprps, DjvlgA, DjvlgB and Djnos, have been selected. The research results show that the degradation of ovary changes from outside layer to inside, and the testis changes are opposite; the reproductive capacity of the planarians starts to be damaged from the 17th to 25th days and to disappear completely from the 26th to 37th days during starvation. The expression patterns of the four genes exhibit the obvious dynamic variations during their desexualization, which indicates that these genes might be involved in gonad development.

Severe protein-calorie malnutrition in two brothers due to abuse by starvation / Desnutrição proteico-calórica grave em dois irmãos devido ao abuso por privação alimentar

Abstract Objective: To describe the case of two siblings with severe protein-calorie malnutrition due to abuse by starvation. Cases description: The two patients were simultaneously referred to the Hospital Municipal, where they were admitted to the Pediatric Gastroenterology clinic of a university hospital for diagnostic investigation of the cause of severe malnutrition and screening tests for Celiac Disease, Cystic Fibrosis and Environmental enteropathy among others. The exams were all normal, and after detailed research on the interactions of this family, we reached the conclusion that the malnutrition was due to abuse by starvation. The children spent approximately two months in the hospital, receiving a high-protein and high-calorie diet, with significant nutritional recovery. Comments: Abuse by starvation, although rare, should always be considered of as one of the causes of child malnutrition and pediatrician should be aware of the child's development, as well as the family interactions, to prevent more severe nutritional and emotional consequences in the future.

Resumo Objetivo: Descrever os casos de dois irmãos acometidos de desnutrição proteico-calórica grave causada por abuso por privação alimentar. Descrição dos caso: Os dois pacientes vieram simultaneamente encaminhados de hospital municipal, onde estavam internados, ao Ambulatório de Gastrenterologia Pediátrica de um hospital universitário para investigação diagnóstica da causa de desnutrição grave. Foram feitos exames para pesquisa de doença celíaca, fibrose cística e enteropatia ambiental, entre outras. Os exames mostraram-se todos normais e, após investigação detalhada sobre o relacionamento dessa família, chegou-se à conclusão de que a desnutrição tinha como causa o abuso por privação alimentar. As crianças passaram cerca de 2 meses internadas, receberam uma dieta hiperproteica e hipercalórica, com recuperação nutricional significativa. Comentários: O abuso por privação alimentar, embora raro, deve sempre ser pensado como uma das causas de desnutrição infantil, deve o pediatra estar atento ao desenvolvimento da criança, bem como ao seu relacionamento familiar, para evitar consequências nutricionais e emocionais mais graves no futuro.

Severe protein-calorie malnutrition in two brothers due to abuse by starvation. / Desnutrição proteico­calórica grave em dois irmãos devido ao abuso por privação alimentar.

OBJECTIVE: To describe the case of two siblings with severe protein-calorie malnutrition due to abuse by starvation. CASES DESCRIPTION: The two patients were simultaneously referred from the Municipal Hospital, where they were admitted to the Pediatric Gastroenterology clinic of a university hospital for diagnostic investigation of the cause of severe malnutrition and screening tests for Celiac Disease, Cystic Fibrosis and Environmental enteropathy among others. The exams were all normal, and after detailed research on the interactions of this family, we reached the conclusion that the malnutrition was due to abuse by starvation. The children spent approximately two months in the hospital, receiving a high-protein and high-calorie diet, with significant nutritional recovery. COMMENTS: Abuse by starvation, although rare, should always be considered of as one of the causes of child malnutrition and pediatrician should be aware of the child's development, as well as the family interactions, to prevent more severe nutritional and emotional consequences in the future.

Decreased memory for novel object recognition in chronically food-restricted mice is reversed by acute ghrelin administration.

It has been demonstrated, in normal and aged rats and mice, that acute i.c.v. ghrelin (Ghr) administration increases memory retention. In order to evaluate if this treatment, restores memory retention in animals exhibiting impaired memory, in the present work we selected a chronic food restriction mouse model (since undernutrition prejudices higher nervous functions). We employed adult female mice with 28 days of 50% food restriction and evaluated: a) behavioral performance using novel object recognition test for memory, and plus maze for anxiety-like behavior, b) some morphometric parameters as body and hepatic weights and c) plasma Ghr levels. The animals with 50% food restriction showed an increase in plasma Ghr levels and a decrease in morphometric parameters and in the percentage of novel object recognition time. When the peptide was i.c.v. injected in food-restricted animals (0.03, 0.3 or 3.0 nmol/microl), memory increases in relation to food-restricted mice injected with vehicle, reaching a performance similar to controls.

Erythrocyte senescence and haematological changes induced by starvation in the neotropical fish traíra, Hoplias malabaricus (Characiformes, Erythrinidae).

Adult specimens of traira (Hoplias malabaricus Bloch) were subjected to long-term starvation (30 to 240 days) and re-fed for 30 days after 90 and 240 days of food deprivation. Counting of immature erythrocytes in peripheral blood showed that erythropoiesis decreased significantly during the first 30 days of food deprivation. The results suggest that a process of senescence takes place in the pre-existent red blood cells and that the cells are not replaced during starvation. After 240 days of starvation, H. malabaricus had a significantly reduced number of red blood cells, causing changes in hematocrit and blood indices (mean corpuscular volume, mean corpuscular haemoglobin and mean corpuscular haemoglobin concentration). Furthermore, during this period, the fish presented leukopenia (lymphocytopenia) and thrombocytopenia. After re-feeding, the number of leukocytes and thrombocytes recovered, but the red blood cell number remained reduced and there was a significant increase in abnormal red cell nuclei.

Food restriction induces in vivo ventricular dysfunction in spontaneously hypertensive rats without impairment of in vitro myocardial contractility.

Cardiac structures, function, and myocardial contractility are affected by food restriction (FR). There are few experiments associating undernutrition with hypertension. The aim of the present study was to analyze the effects of FR on the cardiac response to hypertension in a genetic model of hypertension, the spontaneously hypertensive rat (SHR). Five-month-old SHR were fed a control or a calorie-restricted diet for 90 days. Global left ventricle (LV) systolic function was evaluated in vivo by transthoracic echocardiogram and myocardial contractility and diastolic function were assessed in vitro in an isovolumetrically beating isolated heart (Langendorff preparation). FR reduced LV systolic function (control (mean +/- SD): 58.9 +/- 8.2; FR: 50.8 +/- 4.8%, N = 14, P < 0.05). Myocardial contractility was preserved when assessed by the +dP/dt (control: 3493 +/- 379; FR: 3555 +/- 211 mmHg/s, P > 0.05), and developed pressure (in vitro) at diastolic pressure of zero (control: 152 +/- 16; FR: 149 +/- 15 mmHg, N = 9, P > 0.05) and 25 mmHg (control: 155 +/- 9; FR: 150 +/- 10 mmHg, N = 9, P > 0.05). FR also induced eccentric ventricular remodeling, and reduced myocardial elasticity (control: 10.9 +/- 1.6; FR: 9.2 +/- 0.9%, N = 9, P < 0.05) and LV compliance (control: 82.6 +/- 16.5; FR: 68.2 +/- 9.1%, N = 9, P < 0.05). We conclude that FR causes systolic ventricular dysfunction without in vitro change in myocardial contractility and diastolic dysfunction probably due to a reduction in myocardial elasticity.

Malnutrition: organic and functional consequences.

Malnutrition in its various forms is without doubt the commonest disease. Acute malnutrition resulting from a total lack of ingestion clearly shows that not only are water and electrolytes a priority for survival but also energy reserves. It also shows that the maximum wasting that the lean body mass can withstand is around 40% before the organism collapses and death occurs. Malnutrition is more often the results of insufficient ingestion, and the term protein-calorie malnutrition has been suggested for the most frequently occurring type. This can give rise to confusion because the deficiency in these patients is not limited to these macronutrients but extends, rather, to micronutrients, which are equally important to the functioning of the body. A useful approach for the surgeon is to analyze how the various organs and systems have been affected. The effects on the gastrointestinal tract, the immunologic system, and formation of scar tissue are reviewed.

Perinatal mortality in lambs in southern Brazil.

Hypothermia and dystocia were found to be the most common causes of perinatal mortality in 8 commercial wool flocks in one region of southern Brazil. It was established that low birth weight and poor maternal instinct in the ewes predisposed to losses due to hypothermia but that there appeared to be no association with adverse weather conditions. Other factors possibly predisposing to losses are discussed.

Gasto basal energético en cirugía / Basal metabolic energy expenditure during surgery

La estimación de las demandas metabólicas está sujeta a una gran variabilidad derivada de la talla,el peso,la edad,la actividad física,la ADE y el aumento de demandas metabólicas del proceso patológico.La calorimetría indirecta,efectuada con los modernos monitores metabólicos(en este estudio se utilizó el MGMTWO, Medicor Inc.) dan una buena estimación del GBE.En el presenteestudio se muestra la utilidad del GBE medido y expresado en índice de superficie.En el enfermo quirúrgico se utilizó el indice catabólico de Bristrian para estimar la magnitud del estrés. Se efectuaron 171 observaciones en 85 sujetos,que muestran datos significativos en los siguientes aspectos:confiabilidad del GBE medido y expresado por índice de superficie; relación de la edad con el GBE; influencia del postoperatorio y la sepsis sobre el GBE y el IC; relación del aporte calórico nitrogenado sobre el balance nitrogenado en función del IC; utilización proteica y grado de estrés, y acción dinámica específica del aporte calórico administrado.

Effects of starvation in infancy (pyloric stenosis) on subsequent learning abilities.

The model of starvation in this study was the medical condition of congenital hypertrophic pyloric stenosis. Pyloric stenosis involves a period of brief starvation in early infancy, is unrelated to socioeconomic conditions, and is easily correctable. A number of specific learning abilities together with the general adjustment of 50 subjects, 5 to 14 years old, who had PS were studied and compared to those of 44 siblings and 50 matched controls. Learning ability was negatively correlated with the degree of severity of the starvation. Starvation resulting in reduction of more than 10% of the expected body weight in infancy was associated with poorer learning abilities, especially those involving short-term memory and attention.