Neurodegenerativní nemoci. 28. 4. 2010. Patogeneze?. Zánět Ztráta axonů Metabolismus. Elektrická a magnetická detekce změn. EEG Transkraniální magnetická stimulace (TMS) Positronová emisní tomografie (PET) Magnetická rezonance (MRI). Obrázky PET. Komunikace mezi neurony.
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28. 4. 2010
Schematic of the hypothesized remote cell death mechanisms. After axotomy neuronal and glial changes take place. Axonal lesion can trigger nitric oxide synthase synthesis and changes in the expression of cannabinoid receptors with the appearance of the cannabinoid receptor type 2 in neurons. Neurons that do not present these changes rapidly degenerate. Neuronal changes are associated with both microglial and astrocytic activations. Selective activation of CB2 receptor is associated with neuronal survival and inhibition of the reactive gliosis.
LRP=low-density lipoprotein receptor-related protein
MYOCD a SRF hypotéza arteriální patofyziologie u AD. Vysoké hladiny SRF-MYOCD
V AD VSMC připsívák hypoperfúzimozku u AD (bílá cesta)zvýšenou expresí kontraktilních proteinů (=„ smooth muscle (SM) α-actin, calponin, a myosin heavy chain (MHC) a zvýšeby increasing the expression of genes that regulate calcium homeostasis. This leads to arterial hypercontractility, reduced resting cerebral blood flow (CBF) and attenuated CBF responses to brain activation, which ultimately creates a chronic hypoperfusion state. Furthermore, SRF-MYOCD potentiate CAA and focal brain Aβ accumulation (yellow pathway) via CArG-box dependent activation of SREBP2, which acts as transcriptional suppressor of LRP, a key Aβ clearance receptor
Current understanding of the pathogenesis of MS and potential therapeutic targets. Neuroinflammation has been classically described as the starting point in the pathology of MS. Myelin-specific T cells are believed to orchestrate the autoimmune attack that leads to oligodendrocyte damage and demyelination. Another hallmark of MS, however, is neuronal damage involving both axonal and neuronal loss. Demyelination, axonal transection, and neuronal loss are partly mediated by inflammation but might also occur independently of inflammatory activity. This current understanding of MS pathology impacts directly on therapy development. Ideally, patients need therapies that target both the process of inflammation and the process of neurodegeneration.