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Adipose tissue functional changes during postnatal development and impact of high-fat diet feeding on adipose and liver tissue
Hájková, Simona ; Bardová, Kristina (advisor) ; Hlaváčková, Markéta (referee)
Caloric intake increased over a long period of time may induce the development of obesity, causing so-called low-grade inflammation. The organism responses to the inflammation by the activation and production of cellular components of the immune system, such as macrophages or proinflammatory cytokines. The adipose tissue itself is involved in the production of bioactive molecules, including leptin and adiponectin. Increased concentration of proinflammatory cytokines can lead to a dysfunction of important metabolic pathways and impair organ's function. For the purpose of closer knowledge of the etiology of obesity and its metabolic complications, inbred strains of mice with different genetic backround are most commonly used. We aimed to define the impact of high-fat diet (HFD) on adipose and liver tissue of C57BL/6J and A/J murine strains with a different susceptibility to diet-induced obesity. We focused on description of morphological and functional changes of adipose tissue and on the evaluation of plasma leptin and adiponectin levels of mice in the early postnatal development. Next, we measured the expression of leptin mRNA in four tissues. In this study we described how the increased caloric intake leads to increased triacylglycerides (TAG) storage in the liver and to a higher inflammatory...
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The metabolism of an adipose tissue in mice with high-fat diet-induced obesity: the role of anatomical localization of the tissue and diet composition
Krsková, Kateřina ; Janovská, Petra (advisor) ; Behuliak, Michal (referee)
Regulation of the flow of fatty acids (FA) by futile cycle (TAG/FA cycle) in white adipose tissue (WAT) is an important mechanism of controlling metabolism of FA and therefore its regulation is in the interest of research as a possible therapeutic target in the treatment of obesity and insulin resistance. The study of the murine model suggests that the treatment of the n-3 PUFA with mild caloric restriction (CR) probably induces the TAG/FA cycle mainly in epididymal depot. It also reduces inflammation in WAT and the risk of cardiovascular diseases. We focused on monitoring the gene expression encoding key enzymes of the TAG/FA cycle (PEPCK, ATGL, HSL, DGAT1 and DGAT2) in dorzolumbar (DL), gonadal (GON) and mesenteric (MEZ) depot in a murine model C57BL/6 using qPCR. We were interested in the influence of the composition of fats in the diet, the influence of administration of n-3 PUFA with combination of 10% CR and the difference of gene expression among depots of WAT. The results indicate that the supplementation of high-fat diet with n-3 PUFA contributes mainly to reduction of gene expression for DGAT2 and the combination of n-3 PUFA and CR increases expression of genes influencing the TAG/FA cycle. In MEZ unlike GON and DL fat depot were no significant differences in gene expression, while the different...
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Endocrine role of adipose tissue in the pathogenesis of chronic inflammation in obesity and type 2 diabetes mellitus
Kratochvílová, Helena ; Haluzík, Martin (advisor) ; Taxová Braunerová, Radka (referee)
Adipose tissue as an active endocrine organ is explored in a number of processes associated with metabolic disorders. This work is aimed on studying the effect of endoscopically implantable weight-reducing device - duodeno-jejunal bypass liner - on subclinical inflammation of adipose tissue in obese patients, which contributes to the development of type 2 diabetes mellitus. Specifically, for patients implanted with duodeno- jejunal bypass liner we determined anthropometric, biochemical and hormonal characteristics, and mRNA expression of subcutaneous adipose tissue proinflammatory (TNF-α, leptin, CCL- 2, CX3CL1, CD40, CD80, CD86, CD206, CD163 and IL-6) and anti-inflammatory genes (Adiponektin, IL-10) before, one month and ten months after the intervention. The implantation of duodeno-jejunal bypass liner significantly decreased body weight, waist circumference, and improved metabolic and glycemic control. In addition, C-reactive protein a highly sensitive indicator of inflammatory processes in the body was reduced ten months after implantation. In the case of mRNA expression of CD86 (a marker of activated B lymphocytes and macrophages) there was temporarily increase in adipose tissue one month after the surgery and the subsequent significant decrease after ten months. mRNA expression of other...
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Effect of physical exercise on adipose tissue characteristics: influence of obesity and aging
Čížková, Terezie ; Šiklová, Michaela (advisor) ; Horníková, Daniela (referee)
Obesity and ageing are associated with the changes in adipose tissue characteristics, which are con- sidered as one of important contributors to development of complications, such as cardiovascular diseases or type 2 diabetes. Physical exercise is known to be effective in prevention of diseases rela- ted to obesity and ageing. However, the effect of exercise on adipose tissue characteristics is only few elucidated in humans. The goal of this bachelor thesis is to summarize the main effects of exer- cise on adipose tissue characteristics. This thesis subsequently discuss detrimental changes (dysfunction) of the adipose tissue in obesity. Recent findings about the effects of some types of physical training on health of the elderly people are also mentioned. The initial chapter deals with adipose tissue in general, concretely the morphology, metabolism and endocrine function of the adipose tissue are described. Next part is focused on obesity, the concept of a chronic low-grade inflammatory state is introduced. The key section is the fourth chapter, in which the effects of exer- cise on adipose tissue, i.e. effects on metabolism of adipocytes and activation of immune cells, are reviewed. At the end of this thesis, the pathophysiological changes in inflammatory state and adi- pose tissue distribution associated...
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The possibilities of physical exercise in relation to the metabolism after spinal cord injury
Olišarová, Eva ; Hlinková, Zuzana (advisor) ; Kříž, Jiří (referee)
The goal of this bachelor thesis is to summarize the information about the possibilities of the physical exercise in individuals with the spinal cord injury. The work presents various types of the physical activity and describes their effect on metabolism and body composition. It also includes the information about the frequency, the duration and the intensity of exercise. The interruption of the somatomotor and somatosensory pathways in patients with spinal cord injury leads to the reduction of their physical activity. As a consequence of that, their metabolic profile and body composition get worse. Early after the injury, the patients suffer from the massive muscle atrophy and the rise of the amount of adipose tissue. These changes have a negative effect on metabolism of lipids and carbohydrates. It results in the development of dyslipidaemia and insulin resistance, sometimes even in type 2 diabetes mellitus. These secondary complications worsen the quality and the length of life of the patients with the spinal cord injury. Better understanding of these issues is necessary to improve the quality of health care for these people. The work includes a short questionnaire. Its goal is to describe the current situation of patients with the spinal cord injury in the Czech Republic. The questionnaire was...
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Physiological relevance of futile cycling based on lipolysis and fatty acid re-esterification in white adipose tissue
Funda, Jiří ; Flachs, Pavel (advisor) ; Kolář, David (referee)
AJ The thesis deals with the task of futile metabolic cycling, mainly on the cycle including lipolysis and fatty acid re-esterification, which takes place in white adipose tissue. This cycle plays some essential roles in organism, including regulation of important metabolic pathways in lipid metabolism and also exhibit certain influence on the whole body energy metabolism. First part of the thesis is focused on general properties of futile metabolic cycles and shows some examples of their functions in organism. Next part presents detail view on single steps making the whole lipolysis/re-esterification cycle. Considerable part deals with the ways of regulation of futile cycle activity. This approach may increase an impact of futile cycling on processes under its influence. Physiological relevance of futile metabolic cycle based on lipolysis and fatty acid re-esterification in white adipose tissue was described in numerous studies. This thesis shows their results for a purpose to provide a summary of functions of this system in physiology of mammals. Key words futile metabolic cycle, lipolysis, re-esterification, fatty acids, adipose tissue
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Factors affecting glucose metabolism and inflammatory response in critically ill patients
Kotulák, Tomáš ; Haluzík, Martin (advisor) ; Maruna, Pavel (referee) ; Šenolt, Ladislav (referee)
Hyperglycemia in critically ill patients was considered for many years an adaptive response to stress conditions being present in both patients with and without previous history of diabetes. Hyperglycemia is caused mainly by peripheral insulin resistance induced by the factors acting counteracting insulin signalling at the postreceptor level. Furthermore, hyperglycemia itself can then increase serum levels of pro-inflammatory cytokines such as tumor necrosis factor alpha (TNF-α), interleukin-6 (Il-6) and interleukin-8 (Il- 8) and others. On the contrary, peripheral insulin resistance induced by pro- inflammatory cytokines may further potentiate hyperglycemia. White adipose tissue represents in addition to its energy storage function also a very active endocrine active organ. In addition to regulation of a number of metabolic processes it also significantly modulates the inflammatory response. In critically ill patients, adipose tissue changes its morphology, i.e. the adipocytes are shrinking and adipose tissue is abundantly infiltrated by macrophages. Paradoxically, overweight and obese critically ill patients have lower mortality than underweight, lean and morbidly obese subjects. In our studies, we selected population of the patients undergoing elective major cardiac surgery with extracorporeal...
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The role of immune system in development of obesity and derived metabolic complications
Jindrová, Simona ; Bardová, Kristina (advisor) ; Cinkajzlová, Anna (referee)
Obesity is a chronic disease caused by an imbalance between energy intake and expenditure. Important source of energy is the body fat, stored in adipose tissue cells in the form of triacylglycerols. The adipose tissue does not only store triacylglycerols but also functions as an endocrine organ with the ability to secrete cytokines and adipokines - the molecules, participating in series of the metabolic proceses. The consequence of high-fat diet feeding is the growth of adipose cells and altered production od adipokines and cytokines. Majority of them have proinflammatory functions. Consequently inflammation of adipose tissue is increased as well as the activation of components of immune system, especially macrophages. The interplay between these and other aspects, including hight free fatty acid plasma levels, also associated with metabolic disorders caused by obesity, is connected with the development of insulin resistance, that means state, when the tissues are nonsensitive to insulin. Key words: obesity, adipokines, cytokines, immune system, adipose tissue, insulin resistance
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The role of adipose tissue in the pathophysiology of obesity and anorexia nervosa
Kratochvílová, Helena ; Haluzík, Martin (advisor) ; Pavlišová, Jana (referee)
The view of adipose tissue and its significance in human pathophysiology has changed substantially in the recent couple of years. It has been shown that adipose tissue is not only a passive storage site for excess energy, but that it actively participates in the maintenance of whole-body homeostasis as an endocrine organ producing various hormones and other biologically active molecules, which by acting in an endocrine, paracrine as well as autocrine fashion affect different organs and systems. An intact regulation of adipose tissue processes plays an important role in sustaining the integrity of the organism, whereas its defects lead to the development of a number of diseases. This thesis focuses primarily on the significance of adipose tissue in the pathogenesis of obesity and anorexia nervosa. In the last years, the incidence of obesity rapidly increases ranking, along with its complications, among the world's leading health problems. Obesity is associated with endocrine dysfunction of adipose tissue characterized by disrupted production of adipose tissue hormones and cytokines resulting in the development of numerous disorders including type 2 diabetes mellitus and cardiovascular diseases. A completely opposite disorder, where, however, adipose tissue, or more precisely the absence of it, plays...
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