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Yıl:2014; Cilt: 1; Sayı: 3>> Özet
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The Journal of Neurobehavioral Sciences; 2014;1(3):67-71
Duygudurum Bozukluklarında Agmatin ve İnsan Katyonik AminoAsit Transporter 1: Mikroskobun Altında Ne Var?
HG Bernstein, K Jäger, J Fiebig, S Wolf, M Wick, H Dobrowolny, J Steiner, B Bogerts, G Laube
University of Magdeburg, Germany
Agmantin, nöromodülatör ve nörotransmitter olarak çalışır. Davranışsal olarak agmatin, antidepresanvari etkiler uygular. Enzim olan agmatinaz, agmatini indirger ve böylece devre dışı bırakır. İnsan agmatinini kodlayan, bipolar bozukluk ve majör depresyonla bağlantılı olan bu genin konumu 1p36. kromozomdadır. Fakat bu enzim nöropsikiyatrik hastalıklar bağlamında henüz detaylı olarak incelenmemiştir. Duygusal bozuklukları olan bireylerin postmortem hipokampüsündeki agmatin protein dışavurumunu inceledik. Agmatin proteini, hipokampüs ve diğer beyin bölgelerindeki internöronlar altkümesinde saptanmıştır. Depresif hastalarda agmatin-immunopozitif hücre gövdelerinin sayısı ve sayısal çoğunluğu incelemedeki bütün kısımlarda (hipokampüs, habenula, insular korteks ve temporal korteks) fazlasıyla artmıştır. Agmatin doğal olarak arjininin kırılmasıyla/ bozulmasıyla ortaya çıkmaktadır. L-arjinin ve diğer katyonik amino asitlerin( L-lisin ve L-ornitin gibi) hücresel alınımına temel olarak katonyik amino asit transporter(CAT) proteinleri aracılık eder. Duygudurum bozukluğu olan hastalarda, hipokampüsün CA2 kısmındaki hCAT1 immunoreaktif nöronların sayısal yoğunluğunda sınırlı bir azalma vardı.
Agmatinase and human cationic amino acid transporter 1 in mood disorder: what´s under the microscope?
Agmatine may act as a neurotransmitter or neuromodulator. Behaviorally, agmatine exerts antidepressant-like effects. The enzyme agmatinase degrades and thereby inactivates agmatine. The gene coding for human agmatinase is located on chromosome 1p36, a gene locus which has been linked to bipolar disorder and major depression. However, the enzyme has not yet been studied in detail in the context of neuropsychiatric diseases. We analyzed agmatinase protein expression in postmortem hippocampi of individuals with affective disorders. Agmatinase protein was detected in a subset of interneurons in the hippocampus and other brain regions. In depressive patients the number and the numerical density of agmatinase-immunopositive cell bodies was strongly elevated in all regions under study (i.e. hippocampus, habenula, insular cortex and temporal cortex). Agmatine is naturally produced by the breakdown of arginine. The cellular uptake of L-arginine and other cationic amino acids (such as L-lysine and L-ornithine) is mainly mediated by cationic amino acid transporter (CAT) proteins. In patients with mood disorder there was a circumscribed decrease in the numerical density of hCAT1 immunoreactive neurons in the CA2 region of the hippocampus.

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