Please use this identifier to cite or link to this item: http://localhost:8080/xmlui/handle/123456789/3536
Title: Endogenous H2S‑Assisted Cancer-Cell-Specific Activation of Theranostics with Emission Readout
Authors: Bobba, K N
Saranya, G
Sujai, P T
Joseph, M M
Velusamy, N
Podder, A
Maiti, K K
Bhuniya, S
Keywords: theranostic
cystathionine β-synthase (CBS)
endogenous H2S
cancer cells
Issue Date: 20-Feb-2019
Publisher: American Chemical Society
Citation: ACS Applied Bio Materials; 2(3): 1322-1330
Abstract: Realizing the importance of activation of the anticancer drug, its distribution, and for cancer management, a new theranostic probe has been developed. Endogenous H2S stimulated the theranostic molecular prodrug (TP-HS) which is activated in cancer cells; it monitors the actual time of formation of therapeutic agent SN-38 in cellular milieu through fluorescence imaging. Upon exposure to H2S in a similar physiological condition, the azide functionality converted to amine (−NH2) in TP-HS which allows self-immolative scission of the labile benzyl-carbonate moiety for release of rhodol and SN-38 in a concerted manner. Thus, an intense emission band centered at 548 nm has appeared for quantifying the active therapeutic component. The fluorescence image revealed that the TP-HS preferentially releases rhodol and SN-38 in colon cancer (HCT116 cells) and lung cancer cells (A549 cells) compared to normal human fibroblast cells (WI-38). Further, the dose-dependent antiproliferative activity of TP-HS against various cells supports that TP-HS releases SN-38 based on endogenous H2S in cancer cells followed by its apoptotic progression monitored by (a) live–dead, i.e., acridine orange–ethidium bromide double staining assay, (b) APOPercentage apoptotic assay, and (c) Annexin V-FITC staining by flow cytometry. The theranostic prodrug TP-HS showed anticancer efficacy via the desirable apoptotic pathway. It is the first demonstration of a strategic theranostic molecular prodrug system that could be delivered chemotherapeutically with validating the real-time activation of chemotherapy in the cancer cells without the support of a cancer-directing ligand.
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