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Rab-2A protein: its localization and function in human spermatozoa and fertilization
Sadílková, Lucie ; Postlerová, Pavla (advisor) ; Lánská, Eva (referee)
The Rab-2A protein belongs to the Rab family of monomeric G-proteins involved in the regulation of intracellular vesicular transport. Although several studies describing the role of Rab-2A protein in mammalian sperm have been published, the exact localization and function of this protein in male gametes have not been fully understood yet. In the diploma thesis, we were the first to describe the presence of Rab-2A in human sperm using 5C5, produced by the Laboratory of Reproductive Biology. Using the 5C5 antibody, we were able to identify several Rab-2A isoforms with molecular weights of 26, 24, 22, and 18 kDa in the human sperm lysate, confirmed by mass spectrometry analysis. Using the indirect immunofluorescence method, we localized Rab-2A in the acrosome area of both ejaculated and capacitated sperm. We noticed that Rab-2A leaves the sperm during the acrosomal exocytosis. We also found a reduced Rab-2A protein level in sperm of patients with various pathologies of ejaculate. Based on studies describing the role of Rab-2A in acrosome biogenesis and the presence of Rab-2A in bovine sperm perinuclear theca, we tried to detect Rab-2A in this protein layer in human sperm. However, the chosen method is apparently not applicable to human sperm and isolation has failed. Additionally, we demonstrated the...
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Intracellular domain of glutamate ion channels and its role in the emergence of pathophysiological states
Sadílková, Lucie ; Balík, Aleš (advisor) ; Kolář, David (referee)
Glutamate mediates most of the excitatory neurotransmissions in the central nervous system of mammals. Its effect depends on the presence of glutamate receptors on postsynaptic neurons. NMDA receptors are class of the ionotropic glutamate receptors and are necessary for normal brain function such as synaptic plasticity, learning, memory and correct development of neu- rons. NMDA receptors are also involved in the pathophysiology of many neurodevelopmental and neuropsychiatric diseases. The aim of this work is to evaluate the current knowledge of the role of the intracellular part of NMDA receptors for their function, particularly with respect to the regulation of their localization at excitatory synapses. In addition, it also provides an over- view of the genetic changes found in this part of the receptor, their effect on the functional properties of the receptor and then also a possible link to specific disease.
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