TY  - JOUR
AU  - Despotović, Ana
AU  - Mirčić, Aleksandar
AU  - Misirlić-Denčić, Sonja
AU  - Harhaji-Trajković, Ljubica
AU  - Trajković, Vladimir
AU  - Zogović, Nevena
AU  - Tovilović-Kovačević, Gordana
PY  - 2022
UR  - https://www.hindawi.com/journals/omcl/2022/2998132/
UR  - http://radar.ibiss.bg.ac.rs/handle/123456789/5078
AB  - We investigated the ability of the ascorbic acid (AA) and menadione (MD) combination, the well-known reactive oxidative species- (ROS-) generating system, to induce autophagy in human U251 glioblastoma cells. A combination of AA and MD (AA+MD), in contrast to single treatments, induced necrosis-like cell death mediated by mitochondrial membrane depolarization and extremely high oxidative stress. AA+MD, and to a lesser extent MD alone, prompted the appearance of autophagy markers such as autophagic vacuoles, autophagosome-associated LC3-II protein, degradation of p62, and increased expression of beclin-1. While both MD and AA+MD increased phosphorylation of AMP-activated protein kinase (AMPK), the well-known autophagy promotor, only the combined treatment affected its downstream targets, mechanistic target of rapamycin complex 1 (mTORC1), Unc 51-like kinase 1 (ULK1), and increased the expression of several autophagy-related genes. Antioxidant N-acetyl cysteine reduced both MD- and AA+MD-induced autophagy, as well as changes in AMPK/mTORC1/ULK1 activity and cell death triggered by the drug combination. Pharmacological and genetic autophagy silencing abolished the toxicity of AA+MD, while autophagy upregulation enhanced the toxicity of both AA+MD and MD. Therefore, by upregulating oxidative stress, inhibiting mTORC1, and activating ULK1, AA converts MD-induced AMPK-dependent autophagy from nontoxic to cytotoxic. These results suggest that AA+MD or MD treatment in combination with autophagy inducers could be further investigated as a novel approach for glioblastoma therapy.
PB  - London: Hindawi Ltd.
T2  - Oxidative Medicine and Cellular Longevity
T1  - Combination of Ascorbic Acid and Menadione Induces Cytotoxic Autophagy in Human Glioblastoma Cells
VL  - 2022
DO  - 10.1155/2022/2998132
SP  - 2998132
ER  - 

@article{
author = "Despotović, Ana and Mirčić, Aleksandar and Misirlić-Denčić, Sonja and Harhaji-Trajković, Ljubica and Trajković, Vladimir and Zogović, Nevena and Tovilović-Kovačević, Gordana",
year = "2022",
abstract = "We investigated the ability of the ascorbic acid (AA) and menadione (MD) combination, the well-known reactive oxidative species- (ROS-) generating system, to induce autophagy in human U251 glioblastoma cells. A combination of AA and MD (AA+MD), in contrast to single treatments, induced necrosis-like cell death mediated by mitochondrial membrane depolarization and extremely high oxidative stress. AA+MD, and to a lesser extent MD alone, prompted the appearance of autophagy markers such as autophagic vacuoles, autophagosome-associated LC3-II protein, degradation of p62, and increased expression of beclin-1. While both MD and AA+MD increased phosphorylation of AMP-activated protein kinase (AMPK), the well-known autophagy promotor, only the combined treatment affected its downstream targets, mechanistic target of rapamycin complex 1 (mTORC1), Unc 51-like kinase 1 (ULK1), and increased the expression of several autophagy-related genes. Antioxidant N-acetyl cysteine reduced both MD- and AA+MD-induced autophagy, as well as changes in AMPK/mTORC1/ULK1 activity and cell death triggered by the drug combination. Pharmacological and genetic autophagy silencing abolished the toxicity of AA+MD, while autophagy upregulation enhanced the toxicity of both AA+MD and MD. Therefore, by upregulating oxidative stress, inhibiting mTORC1, and activating ULK1, AA converts MD-induced AMPK-dependent autophagy from nontoxic to cytotoxic. These results suggest that AA+MD or MD treatment in combination with autophagy inducers could be further investigated as a novel approach for glioblastoma therapy.",
publisher = "London: Hindawi Ltd.",
journal = "Oxidative Medicine and Cellular Longevity",
title = "Combination of Ascorbic Acid and Menadione Induces Cytotoxic Autophagy in Human Glioblastoma Cells",
volume = "2022",
doi = "10.1155/2022/2998132",
pages = "2998132"
}

Despotović, A., Mirčić, A., Misirlić-Denčić, S., Harhaji-Trajković, L., Trajković, V., Zogović, N.,& Tovilović-Kovačević, G.. (2022). Combination of Ascorbic Acid and Menadione Induces Cytotoxic Autophagy in Human Glioblastoma Cells. in Oxidative Medicine and Cellular Longevity
London: Hindawi Ltd.., 2022, 2998132.
https://doi.org/10.1155/2022/2998132

Despotović A, Mirčić A, Misirlić-Denčić S, Harhaji-Trajković L, Trajković V, Zogović N, Tovilović-Kovačević G. Combination of Ascorbic Acid and Menadione Induces Cytotoxic Autophagy in Human Glioblastoma Cells. in Oxidative Medicine and Cellular Longevity. 2022;2022:2998132.
doi:10.1155/2022/2998132 .

Despotović, Ana, Mirčić, Aleksandar, Misirlić-Denčić, Sonja, Harhaji-Trajković, Ljubica, Trajković, Vladimir, Zogović, Nevena, Tovilović-Kovačević, Gordana, "Combination of Ascorbic Acid and Menadione Induces Cytotoxic Autophagy in Human Glioblastoma Cells" in Oxidative Medicine and Cellular Longevity, 2022 (2022):2998132,
https://doi.org/10.1155/2022/2998132 . .

TY  - JOUR
AU  - Isaković, Anđelka M
AU  - Petričević, Sasa M.
AU  - Ristić, Slavica M.
AU  - Popadić, Dušan M.
AU  - Kravić-Stevović, Tamara K
AU  - Zogović, Nevena
AU  - Poljarević, Jelena M.
AU  - Živanović Radnić, Tatjana V
AU  - Sabo, Tibor J.
AU  - Isaković, Aleksandra J.
AU  - Marković, Ivanka D.
AU  - Trajković, Vladimir S.
AU  - Misirlić-Denčić, Sonja T
PY  - 2018
UR  - https://insights.ovid.com/crossref?an=00008390-201802000-00002
UR  - https://radar.ibiss.bg.ac.rs/handle/123456789/3004
AB  - Melanoma, an aggressive skin tumor with high metastatic potential, is associated with high mortality and increasing morbidity. Multiple available chemotherapeutic and immunotherapeutic modalities failed to improve survival in advanced disease, and the search for new agents is ongoing. The aim of this study was to investigate antimelanoma effects of O,O-diethyl-(S,S)-ethylenediamine-N,N'di-2-(3-cyclohexyl) propanoate dihydrochloride (EE), a previously synthesized and characterized organic compound. Mouse melanoma B16 cell viability was assessed using acid phosphatase, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide, sulforhodamine B, and lactate dehydrogenase assays. Apoptosis and autophagy were investigated using flow cytometry, fluorescence and electron microscopy, and western blotting. In vivo antitumor potential was assessed in subcutaneous mouse melanoma model after 14 days of treatment with EE. Tumor mass and volume were measured, and RT-PCR was used for investigating the expression of autophagy-related, proapoptotic, and antiapoptotic molecules in tumor tissue. Investigated organic compound exerts significant cytotoxic effect against B16 cells. EE induced apoptosis, as confirmed by phosphatidyl serine externalisation, caspase activation, and ultrastructural features typical for apoptosis seen on fluorescence and electron microscopes. The apoptotic mechanism included prompt disruption of mitochondrial membrane potential and oxidative stress. No autophagy was observed. Antimelanoma action and apoptosis induction were confirmed in vivo, as EE decreased mass and volume of tumors, and increased expression of several proapoptotic genes. EE possesses significant antimelanoma action and causes caspase-dependent apoptosis mediated by mitochondrial damage and reactive oxygen species production. Decrease in tumor growth and increase in expression of proapoptotic genes in tumor tissue suggest that EE warrants further investigation as a candidate agent in treating melanoma.
PB  - Melanoma Research
T2  - Melanoma Research
T2  - Melanoma Research
T1  - In vitro and in vivo antimelanoma effect of ethyl ester cyclohexyl analog of ethylenediamine dipropanoic acid.
IS  - 1
VL  - 28
DO  - 10.1097/CMR.0000000000000409
SP  - 8
EP  - 20
ER  - 

@article{
author = "Isaković, Anđelka M and Petričević, Sasa M. and Ristić, Slavica M. and Popadić, Dušan M. and Kravić-Stevović, Tamara K and Zogović, Nevena and Poljarević, Jelena M. and Živanović Radnić, Tatjana V and Sabo, Tibor J. and Isaković, Aleksandra J. and Marković, Ivanka D. and Trajković, Vladimir S. and Misirlić-Denčić, Sonja T",
year = "2018",
abstract = "Melanoma, an aggressive skin tumor with high metastatic potential, is associated with high mortality and increasing morbidity. Multiple available chemotherapeutic and immunotherapeutic modalities failed to improve survival in advanced disease, and the search for new agents is ongoing. The aim of this study was to investigate antimelanoma effects of O,O-diethyl-(S,S)-ethylenediamine-N,N'di-2-(3-cyclohexyl) propanoate dihydrochloride (EE), a previously synthesized and characterized organic compound. Mouse melanoma B16 cell viability was assessed using acid phosphatase, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide, sulforhodamine B, and lactate dehydrogenase assays. Apoptosis and autophagy were investigated using flow cytometry, fluorescence and electron microscopy, and western blotting. In vivo antitumor potential was assessed in subcutaneous mouse melanoma model after 14 days of treatment with EE. Tumor mass and volume were measured, and RT-PCR was used for investigating the expression of autophagy-related, proapoptotic, and antiapoptotic molecules in tumor tissue. Investigated organic compound exerts significant cytotoxic effect against B16 cells. EE induced apoptosis, as confirmed by phosphatidyl serine externalisation, caspase activation, and ultrastructural features typical for apoptosis seen on fluorescence and electron microscopes. The apoptotic mechanism included prompt disruption of mitochondrial membrane potential and oxidative stress. No autophagy was observed. Antimelanoma action and apoptosis induction were confirmed in vivo, as EE decreased mass and volume of tumors, and increased expression of several proapoptotic genes. EE possesses significant antimelanoma action and causes caspase-dependent apoptosis mediated by mitochondrial damage and reactive oxygen species production. Decrease in tumor growth and increase in expression of proapoptotic genes in tumor tissue suggest that EE warrants further investigation as a candidate agent in treating melanoma.",
publisher = "Melanoma Research",
journal = "Melanoma Research, Melanoma Research",
title = "In vitro and in vivo antimelanoma effect of ethyl ester cyclohexyl analog of ethylenediamine dipropanoic acid.",
number = "1",
volume = "28",
doi = "10.1097/CMR.0000000000000409",
pages = "8-20"
}

Isaković, A. M., Petričević, S. M., Ristić, S. M., Popadić, D. M., Kravić-Stevović, T. K., Zogović, N., Poljarević, J. M., Živanović Radnić, T. V., Sabo, T. J., Isaković, A. J., Marković, I. D., Trajković, V. S.,& Misirlić-Denčić, S. T.. (2018). In vitro and in vivo antimelanoma effect of ethyl ester cyclohexyl analog of ethylenediamine dipropanoic acid.. in Melanoma Research
Melanoma Research., 28(1), 8-20.
https://doi.org/10.1097/CMR.0000000000000409

Isaković AM, Petričević SM, Ristić SM, Popadić DM, Kravić-Stevović TK, Zogović N, Poljarević JM, Živanović Radnić TV, Sabo TJ, Isaković AJ, Marković ID, Trajković VS, Misirlić-Denčić ST. In vitro and in vivo antimelanoma effect of ethyl ester cyclohexyl analog of ethylenediamine dipropanoic acid.. in Melanoma Research. 2018;28(1):8-20.
doi:10.1097/CMR.0000000000000409 .

Isaković, Anđelka M, Petričević, Sasa M., Ristić, Slavica M., Popadić, Dušan M., Kravić-Stevović, Tamara K, Zogović, Nevena, Poljarević, Jelena M., Živanović Radnić, Tatjana V, Sabo, Tibor J., Isaković, Aleksandra J., Marković, Ivanka D., Trajković, Vladimir S., Misirlić-Denčić, Sonja T, "In vitro and in vivo antimelanoma effect of ethyl ester cyclohexyl analog of ethylenediamine dipropanoic acid." in Melanoma Research, 28, no. 1 (2018):8-20,
https://doi.org/10.1097/CMR.0000000000000409 . .