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The role of orexins in food intake and chosen pathological phenomena
Zelená, Anna ; Sumová, Alena (advisor) ; Balounová, Kateřina (referee)
Orexins are neuropeptides produced in the lateral hypothalamus in the brain and peripheral organs. These neuropeptides are essential in regulating arousal and energy balance. They also participate in the reward system and secure water homeostasis. Orexins bind to the orexin receptors differently expressed in various tissues. The binding of orexins to their receptors couples with downstream signalling pathways, e.g., Ca2+ , diacylglycerol and protein kinase C pathways. Low concentration of adenosine triphosphate leads to the inactivation of orexin-expressing neurons and the reduction of energy expenditure. On the contrary, high intracellular concertation of adenosine triphosphate activates energy expenditure. Food intake is regulated by orexins and glucose, sirtuin 1, forkhead box transcription factor 2, and leptin. This thesis aims to find connections between the role of orexins in regulating food intake and the development of some pathological phenomena, e.g., hypertension, obesity, and anorexia nervosa. Keywords orexin, obesity, anorexia nervosa, glucose, insulin, stress
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