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Effects of acute starvation and of type 2 diabetes mellitus upon insulin resistance and substrate utilization in obese subjects
Duška, František ; Anděl, Michal (advisor) ; Haluzík, Martin (referee) ; Mourek, Jindřich (referee) ; Stárka, Luboslav (referee)
Very-low calorie diet or even total short-term fasting is widely used in clinical practice in order to improve metabolic compensation of patients with type 2 diabetes mellitus. Although benefits of weight reduction are well proven in T2DM, much less is known about effects of acute starvation, during which the interruption of the afflux of energy substrates is not followed by a major change of body composition. We hypothesize the improvement of insulin effects on glucose metabolism in T2DM as these patients may lack the key metabolic responses which impair insulin sensitivity in lean, non-diabetic subjects. Moreover, we assume according to "thrifty genotype hypothesis" that protein wasting during starvation will be positively related to insulin effects on glucose disposal and negatively related to insulin antilipolytic and antiketogenic effects. In the light of this we designed an observational, prospective, in-hospital study, comparing the effects of 60 hours fast on various aspects of insulin resistance, endocrine regulation and metabolism in 10 patients with T2DM and 10 obese controls without diabetes (OB).
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The male equivalent of polycystic ovary syndrome
Dušková, Michaela ; Stárka, Luboslav (advisor) ; Haluzík, Martin (referee) ; Kittnar, Otomar (referee)
Polycystic ovary syndrome, the most common endocrinopathy in women (with a prevalence of 5-10 %), is characterized by hormonal and metabolic imbalance. Complexity of symptoms of close relatives of women with PCOS as a mendelian trait raised a hypothesis about the existence of a male equivalent of PCOS. Premature alopecia was suggested as one of the signs of a male phenotype of this syndrome. Androgenetic alopecia is the most common cause of balding in men. AGA is the risk factor of cardiovascular diseases, glucose metabolism disorders and also benign prostate hyperplasia and prostate carcinoma. Polycystic ovary syndrome and metabolic syndrome are the risk factors of obesity and diabetes mellitus. The existence of mendelian form of PCOS initiated a hypothesis about the existence of a male equivalent of PCOS. Premature alopecia was suggested as one of the signs of a male phenotype of this syndrome. However, it can be the sign of metabolic syndrome as well. PCOS is characterized by hyperandrogenaemia while metabolic syndrome is characterized by low androgens.
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název v anglickém jazyce není uveden
Kříž, Jan ; Saudek, František (advisor) ; Jendelová, Pavla (referee) ; Haluzík, Martin (referee)
Islet transplantation represents an alternative approach in the treatment of patients with type-1 diabetes mellitus. It makes possible to give insulin-producing tissue to patients, which could not underwent surgery operative due to ill health. The second benefit of tissue transplantation is utilization of pancreases unsuitable for organ transplantation in term of surgical criteria. The dissertation includes two studies focused on study of some problems of islet transplantation. In the first study was tested a new method for induction of microchimerism by bone marrow transplantation and its effect on islet allograft survival. We reported, that short-term tacrolimus therapy significantly prolonged insulin independence in fully allogeneic rat model even if the immunosupresants were discontinued. Conditioning of recipients with bone marrow cells transplantation had not additional effect. In the second study there is presented an approach for imaging of intrahepatally-sited islets. The technique is based on labeling of islets by non-toxic superparamagnetic agent during two day culture. After transplantation islets are imaged as hypointense spots on T2 weighing magnetic resonance sections in both in vitro and in vivo experiments. Outstanding changes in MR images were demonstrated during acute rejection of...
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The role of GH/IGF-1 axis components in the etiopathogenesis of metabolic disturbances in type 2 diabetes mellitus and acromegaly
Toušková, Věra ; Haluzík, Martin (advisor) ; Müllerová, Dana (referee) ; Saudek, František (referee)
(EN) GH/IGF-1 axis components (GH, growth hormone receptor (GH-R), IGF-1, IGF-1 receptor (IGF-1R), IGF-binding proteins (IGFBPs)) participate in the control of glucose metabolism, inflammatory processes as well as cell proliferation and differentiation, including adipocytes and monocytes. The aim of the present study was to evaluate the role of local mRNA expression of GH/IGF-1 axis components in subcutaneous adipose tissue (SCAT) and peripheral monocytes (PM) in the development of insulin resistance and differences of adipose tissue mass in following groups of patients: obese females with and without type 2 diabetes mellitus and subjects with active untreated acromegaly. A total number of 66 subjects were included in the study: obese females without type 2 diabetes mellitus (OB), obese females with type 2 diabetes mellitus (T2DM), acromegalic patients (AC) and healthy lean control subjects (C). T2DM underwent 2 weeks of very-low- calorie diet (VLCD - energy content 2500 kJ/day). According to our results we suggest that decreased mRNA expression of IGF-1, IGF-1R, IGFBP-2 and IGFBP-3 in adipose tissue of T2DM subjects may contribute to changes of fat differentiation capacity and the increased IGF-1R mRNA expression in peripheral monocytes in these patients may play a role in the regulation of...
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