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Yıl:2014; Cilt: 1; Sayı: 3>> Özet
TAM METİN
The Journal of Neurobehavioral Sciences; 2014;1(3):77-81
Beyindeki Poliamin Yolak Enzimlerinin Lokalizasyonunun Anlamı
G Laube, HG Bernstein, RW Veh, T Weiss
Charité - Universitätsmedizin Berlin, Germany
Spermidin, spermin ve agmatini içeren poliaminler beyne özgü pek çok fonksiyonu çalıştırmaktadır. Poliamin dolaşım mekanizmaları, beyinde nöromodülatör ve nörotransmitterler gibi sinaptik olarak salgılanabilen bu organik katyonların yeniden dağıtımından sorumlu olabilmektedir. Bu nedenle, poliaminlerin lokalizasyon ve fonksiyon incelemesine ek olarak poliamin yolak enzimlerinin lokalizasyonu, özellikle psikolojik bozukluklar ve nörolojik dejeneratif hastalıklarda poliaminlerin hücre tanımlaması ve bölgeye özgü rolleriyle alakalı hatırı sayılır bilgiler sağlamaktadır. Belirli nöronal devreler fizyolojik ve farmakolojik araştırmalara bağlıdır. Bu çalışma kapsamında spermedin sentezi ve agmatinin belirli sinaptik ifadesini nispeten gösteren serebral korteksi ve medial habenulayı elektrofizyolojik olarak incelenmiştir. Her iki alanda da ilgili poliaminler açık bir şekilde elektriksel aktiviteyi etkilemekte ve medial habenula majör depresif rahatsızlığın etiyolojisinde yer alabilmektedir. Bu bağlamda, paraventriküler talamik nükleusu gibi beynin diğer bölümlerindeki agmatinin ifadesiyle depresyon ilişkisinin olasılığı tartışılacaktır
The Rationale for the Localization of Polyamine Pathway Enzymes in the Brain
Polyamines, including spermidine, spermine, and agmatine, serve several brain-specific functions. Polyamine transport mechanisms may account for the redistribution of these organic cations, which may also be synaptically released as neuromodulators or neurotransmitters, in the brain. Therefore, the localization of polyamine pathway enzymes, in addition to the localization and functional investigation of the polyamines itself, provides valuable insights regarding the identification of cell- and region-specific roles for polyamines, notably in the context of mental disorders and neurodegenerative diseases. Identified neuronal circuits are subject to physiological and pharmacological investigations. With this respect, we electrophysiologically studied the cerebellar cortex and the medial habenula, showing a prominent synaptic expression of spermidine synthase and agmatinase, respectively. In both areas, the relevant polyamines clearly influence the electrical activity. The medial habenula may be involved with the aetiology of major depressive disorder. In this context, the expression of agmatinase in other brain areas, e.g. the paraventricular thalamic nucleus, possibly also involved with depression, is discussed.

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