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Yıl:2019; Cilt: 6; Sayı: 1>> Özet
TAM METİN
The Journal of Neurobehavioral Sciences; 2019;6(1):62-66
Parkinson hastalığında alfa sinüklein fibrillerinin aksonal transportu
FC Tunçel, BA Arslan
Üsküdar Üniversitesi, İstanbul
Nörodejeneratif hastalıklar, merkezi sinir sisteminde (MSS) bulunan nöronların zaman içerisinde ilerleyici ve geri dönüşsüz biçimde kaybolması ile karakterize edilmektedir. Parkinson hastalığının en önemli belirteci dopaminerjik nöronlarda meydana gelen fonksiyon bozuklukları ve buna bağlı motor semptomlarda aksaklık meydana gelmesidir. Bu hastalığın oluşumunda henüz kesin olarak nasıl bir mekanizma ile etki ettiği bilinmeyen, sinüklein protein ailesinden alfa sinüklein adı verilen bir proteinin yanlış katlanması ve presinaptik aralıkta birikmesi sonucunda lewy cisimcikleri olarak bilinen agregasyonların neden olduğu bilinmektedir. Alfa sinüklein, presinaptik nöronda sentezlenen ve akson ucuna aksonal transport adı verilen bir mekanizma ile taşınır. Alfa sinüklein, ister doğal halinde isterse de yanlış katlanmış olsun motor proteinlerle hem retrograd hemde anterograd yönde akson boyunca taşınabilir. Bu durumda yanlış katlanmış alfa sinüklein presinaptik alanda birikebilir ve aksonal transportta hasara neden olabilir. Burada, alfa sinüklein birikiminin aksonal transport hasarı ile ilişkisi, presinaptik alanda bulunan ve normalde yanlış katlanan proteinlerin bozulmasından sorumlu olan şaperon aracılı otofaji (CMA) ve ubikitin- proteozom sisteminin neden düzgün çalışamadığı ile ilgili mevcut bilgileri inceledik.
Axonal transport of alpha synuclein fibris in Parkınson’s disease
Neurodegenerative diseases are characterized by progressive and irreversible loss of neurons in the central nervous system (CNS) over time. The most important symptom of Parkinson’s disease is dysfunctional disorders in the dopaminergic neurons, and the associated symptoms of motor symptoms. It is well known that aggregates known as lewy bodies are caused by misfolding and accumulation in the presynaptic range of a protein called alpha synuclein from the synuclein protein family, which is not known yet to precisely influence the mechanism of this disease. The alpha synuclein is synthesized in the presynaptic neuron and transported by the mechanism called the axonal transport to axon end. Alpha synuclein can be transported along the axon both retrograde and anterograde with motor proteins as natural or false folded. In this case, the false folded alpha synuclein may accumulate in the presynaptic area and cause damage to axonal transport. Here, we review the current information on the question of why the chaperone-mediated autophagy (CMA) and the ubiquitin-proteosome system, which are responsible for axonal transport injury of alpha synuclein accumulation, and which are responsible for the degradation of normally misfolded proteins in the presynaptic area

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