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TRX/TRXR1 ENZİM SİSTEMİNİN BİYOKİMYASI VE MEME KANSERİ KEMOTERAPİSİNDE DOĞAL ÜRÜN KAYNAKLI MODÜLASYONU

ESMA KÜBRA KAĞAN YENİÇERİ
Dr., Erzincan Binali Yıldırım Üniversitesi
Erişim Durumu
Özel Erişim
Yayınlanma Tarihi
Sayfa Sayısı
-
DOI

Özet

Tiyoredoksin redüktaz 1 (TrxR1/TXNRD1), NADPH’den aldığı elektronları tiyoredoksine aktararak hücresel redoks homeostazının sürdürülmesinde kritik rol oynayan, selenosistein içeren bir flavoenzimdir. Katalitik C-terminal selenosistein kalıntısının yüksek nükleofilikliği ve elektrofillere karşı reaktivitesi, TrxR1’in kimyasal olarak dikkat çekici bir enzim olmasını sağlarken, bu özelliği enzimi son yıllarda redoks biyolojisi ve kanser araştırmalarında giderek önem kazanan bir moleküler hedef haline getirmiştir. Özellikle enzimin erişilebilir C-terminal selenosistein kalıntısı, elektrofilik doğal ürünler açısından potansiyel bir terapötik hedef niteliğindedir. Meme kanserinde artmış TXNRD1/TrxR1 ekspresyonunun kötü prognoz ve tedavi yanıtıyla ilişkilendirilmesi, TrxR1 aracılı redoks sisteminin kemodirençteki olası rolüne yönelik ilgiyi artırmıştır. Meme kanserinde artmış TXNRD1/TrxR1 ekspresyonunun kötü prognoz ve bağımsız prognostik değer ile ilişkilendirilmesi, bu redoks sistemini kemodirenç açısından önemli bir hedef haline getirmektedir. Bununla birlikte, TrxR1/Trx ekseninin kemoterapi yanıtındaki etkisi bağlama bağımlıdır. İndirgenmiş Trx’nin ASK1 aktivasyonunu baskılayarak apoptozu sınırlandırabildiği bildirilirken, bazı modellerde TrxR1 aracılı redoks süreçlerinin antrasiklinlerin redoks döngüsüne ve p53-bağımlı apoptotik yanıtın oluşumuna katkıda bulunabildiği gösterilmiştir. Kurkumin, piperlongumin ve şikonin gibi doğal bileşiklerin TrxR1'in C-terminal selenosistein bölgesini hedefleyerek enzimi geri dönüşümsüz biçimde inhibe ettiği ve pro-oksidan SecTRAP oluşumunu tetiklediği bildirilmiştir. Bununla birlikte, vulpinik asit, difraktaik asit ve evernik asit gibi liken kaynaklı sekonder metabolitlerin meme kanseri hücrelerinde TrxR1 aktivitesini azaltmasına rağmen, bu bileşiklerin selenosistein bölgesiyle doğrudan etkileşimi henüz ortaya konmamıştır. Ayrıca, doğal ürün–kemoterapötik kombinasyonlarında elde edilen yanıtların bileşiğe ve kemoterapötik ajana göre değişkenlik göstermesi, sinerjinin nicel olarak ve her kombinasyon için ayrı değerlendirilmesi gerektiğini göstermektedir. Mevcut veriler; hedef doğrulama, izoform ve hücre içi kompartman farklılıkları, redoks sinyal ağlarının kapsamlı değerlendirilmemesi, antrasiklin kombinasyonlarına ilişkin sınırlı kanıt ve GSH/Nrf2 gibi telafi edici mekanizmaların yanı sıra normal dokularda TrxR1'in fizyolojik öneminden kaynaklanan güvenlik kaygıları nedeniyle alanın hâlen araştırma ve hipotez oluşturma aşamasında olduğunu göstermektedir.

Anahtar Kelimeler: doğal ürünler, kemodirenç, meme kanseri, TrxR1, Trx

Konu Alanı: Biyoloji -> Biyoloji (diğer) -> Biyokimya

Bu Bölüme Atıf Yap
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Kitap Bölümü (PDF)
TRX/TRXR1 ENZİM SİSTEMİNİN BİYOKİMYASI VE MEME KANSERİ KEMOTERAPİSİNDE DOĞAL ÜRÜN KAYNAKLI MODÜLASYONU
Bu Bölüme Atıf Yap:
KAĞAN YENİÇERİ, E. K. (2026). TRX/TRXR1 ENZİM SİSTEMİNİN BİYOKİMYASI VE MEME KANSERİ KEMOTERAPİSİNDE DOĞAL ÜRÜN KAYNAKLI MODÜLASYONU. In ÖZDOKUR, K. V. (Ed.), Çağdaş Kimya Araştırmaları ve Multidisipliner Uygulamaları-Contemporary Chemistry Research and Multidisciplinary Applications (pp. -). Vizetek Yayıncılık. https://doi.org/10.54637/vizetek.9786253824792
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