Autoinhibitory feedback control over photodynamic action
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Dosyalar
Tarih
2019
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
AMER CHEMICAL SOC
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
In biology, the activity of enzymes is usually regulated by feedback loops, which enables direct communication between enzymes and the state of the cell. In a similar manner, with the intention to have automated activity regulation, the therapeutic effect of a photosensitizer (BOD1) is shown to be reduced through a negative feedback loop initiated by the photosensitizer. Photodynamic action produces cytotoxic O-1(2) and this reactive oxygen species reacts with ascorbate, generating H2O2. Peroxide-mediated oxidation of the photosensitizer auxiliary group leads to the formation of inactive BOD2 from the parent photosensitizer. BOD1 is shown to accumulate in mitochondria, and cell viability is shown to decrease significantly with BOD1 compared to the loop end product, BOD2. Photoinduced enhancement of fluorescence indicates the formation of inactive BOD2 under cellular conditions, and enhanced fluorescence acts as a reporter for the activity of the photosensitizer. We present the first example of PDT autoinactivation, and such a feedback control mechanism would enable a decrease in post-therapy side effects.
Açıklama
Anahtar Kelimeler
photodynamic therapy, photosensitizer, H2O2
Kaynak
ACS OMEGA
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
4
Sayı
7
Künye
Yurt, M. N. Z., Cakmak, Y., Tekin, G., Karakurt, S., Cakmak, S. E. (2019). Autoinhibitory Feedback Control over Photodynamic Action. ACS Omega, 4(7), 12293-12299.
