1
|
Li H, Weng Y, Lai L, Lei H, Xu S, Zhang Y, Li L. KLF9 regulates PRDX6 expression in hyperglycemia-aggravated bupivacaine neurotoxicity. Mol Cell Biochem 2021; 476:2125-2134. [PMID: 33547545 DOI: 10.1007/s11010-021-04059-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Accepted: 01/11/2021] [Indexed: 12/12/2022]
Abstract
BACKGROUND Neurotoxicity induced by local anesthetics (LAs) is potentially life threatening, especially for patients with underlying diseases like diabetes. The anesthetic bupivacaine (Bup) has been reported to induce neurotoxicity mediated by reactive oxygen species (ROS), which is aggravated by hyperglycemia. Krüppel-like factor 9 (KLF9), an axon growth-suppressing transcription factor, plays a key role in neuronal maturation and promotes oxidative stress. This study was designed to investigate whether and how KLF9 regulates ROS levels related to LA neurotoxicity under hyperglycemic conditions. METHODS Klf9/GFP ShRNA (LV Sh-Klf9) was used to achieve stable Klf9 knockdown in the SH-SY5Y cell line. KLF9-deficient and normal cells were cultured under normal or high-glucose (HG) culture conditions and then exposed to Bup. Cell viability, intracellular and mitochondrial ROS, and mitochondrial membrane potential (ΔΨm) were detected to examine the role of KLF9. Thereafter, KLF9-deficient and normal cells were pretreated with small-interfering RNA targeting peroxiredoxin 6 (siRNA-Prdx6) to determine if PRDX6 was the target protein in HG-aggravated Bup neurotoxicity. RESULTS The mRNA and protein levels of KLF9 were increased after Bup and hyperglycemia treatment. In addition, cell survival and mitochondrial function were significantly improved, and ROS production was decreased after Sh-Klf9 treatment compared with Sh-Ctrl. Furthermore, the expression of PRDX6 was suppressed by Bup in hyperglycemic cultures and was upregulated in the Sh-Klf9 group. Moreover, the protection provided by KLF9 deficiency for cell survival, the increase in ROS production in cells and mitochondria, and the disruption of mitochondrial function were abolished by Prdx6 knockdown. CONCLUSIONS The results of this study demonstrated that hyperglycemia aggravated Bup neurotoxicity by upregulating KLF9 expression, which repressed the antioxidant PRDX6 and led to mitochondrial dysfunction, ROS burst, and cell death. Understanding this mechanism may, thus, offer valuable insights for the prevention and treatment of neurotoxicity induced by LAs, especially in diabetic patients.
Collapse
Affiliation(s)
- Hui Li
- Department of Anesthesiology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China
| | - Yaqian Weng
- Department of Anesthesiology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China
| | - Luying Lai
- Department of Anesthesiology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China
| | - Hongyi Lei
- Department of Anesthesiology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China
| | - Shiyuan Xu
- Department of Anesthesiology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China
| | - Yang Zhang
- Division of Orthopaedic Surgery, Department of Orthopaedics, Southern Medical University, Nanfang hospital, Guangzhou, 510282, Guangdong, China.
| | - Le Li
- Department of Anesthesiology, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China.
| |
Collapse
|
2
|
Mendonca P, Soliman KFA. Flavonoids Activation of the Transcription Factor Nrf2 as a Hypothesis Approach for the Prevention and Modulation of SARS-CoV-2 Infection Severity. Antioxidants (Basel) 2020; 9:E659. [PMID: 32722164 PMCID: PMC7463602 DOI: 10.3390/antiox9080659] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 07/22/2020] [Accepted: 07/22/2020] [Indexed: 12/12/2022] Open
Abstract
The Nrf2-Keap1-ARE pathway is the principal regulator of antioxidant and phase II detoxification genes. Its activation increases the expression of antioxidant and cytoprotective proteins, protecting cells against infections. Nrf2 modulates virus-induced oxidative stress, ROS generation, and disease pathogenesis, which are vital in the viral life cycle. During respiratory viral infections, such as the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), an inflammatory process, and oxidative stress of the epithelium lining cells activate the transcription factor Nrf2, which protects cells from oxidative stress and inflammation. Nrf2 reduces angiotensin-converting enzyme 2 (ACE2) receptors expression in respiratory epithelial cells. SARS-CoV2 has a high affinity for ACE2 that works as receptors for coronavirus surface spike glycoprotein, facilitating viral entry. Disease severity may also be modulated by pre-existing conditions, such as impaired immune response, obesity, and age, where decreased level of Nrf2 is a common feature. Consequently, Nrf2 activators may increase Nrf2 levels and enhance antiviral mediators' expression, which could initiate an "antiviral state", priming cells against viral infection. Therefore, this hypothesis paper describes the use of flavonoid supplements combined with vitamin D3 to activate Nrf2, which may be a potential target to prevent and/or decrease SARS-CoV-2 infection severity, reducing oxidative stress and inflammation, enhancing innate immunity, and downregulating ACE2 receptors.
Collapse
Affiliation(s)
| | - Karam F. A. Soliman
- College of Pharmacy and Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32307, USA;
| |
Collapse
|
3
|
Sulforaphane-Induced Klf9/Prdx6 Axis Acts as a Molecular Switch to Control Redox Signaling and Determines Fate of Cells. Cells 2019; 8:cells8101159. [PMID: 31569690 PMCID: PMC6829349 DOI: 10.3390/cells8101159] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Revised: 09/21/2019] [Accepted: 09/26/2019] [Indexed: 12/13/2022] Open
Abstract
Sulforaphane (SFN), an activator of transcription factor Nrf2 (NFE2-related factor), modulates antioxidant defense by Nrf2-mediated regulation of antioxidant genes like Peroxiredoxin 6 (Prdx6) and affects cellular homeostasis. We previously observed that dose levels of SFN are crucial in determining life or death of lens epithelial cells (LECs). Herein, we demonstrated that higher doses of SFN (>6 μM) activated death signaling by overstimulation of Nrf2/ARE (antioxidant response element)-mediated Kruppel-like factor (Klf9) repression of Prdx6 expression, which increased reactive oxygen species (ROS) load and cell death. Mechanistically, Klf9 bound to its repressive Klf9 binding elements (RKBE; 5-CA/GCCC-3) in the Prdx6 promoter, and repressed Prdx6 transcription. Under the condition of higher dose of SFN, excessive Nrf2 abundance caused death signaling by enforcing Klf9 activation through ARE (5-RTGAYnnnGC-3) in Klf9 promoter that suppress antioxidant genes such as Prdx6 via a Klf9-dependent fashion. Klf9-depletion showed that Klf9 independently caused ROS reduction and subsequent cell survival, demonstrating that Klf9 upregulation caused cell death. Our work revealed the molecular mechanism of dose-dependent altered activity of SFN in LECs, and demonstrated that SFN activity was linked to levels of Nrf2/Klf9/Prdx6 axis. We proposed that in the development of therapeutic interventions for aging/oxidative disorders, combinations of Klf9-ShRNA and Nrf2 inducers may prove to be a promising strategy.
Collapse
|
4
|
Bagheri-Yarmand R, Sinha KM, Li L, Lu Y, Cote GJ, Sherman SI, Gagel RF. Combinations of Tyrosine Kinase Inhibitor and ERAD Inhibitor Promote Oxidative Stress-Induced Apoptosis through ATF4 and KLF9 in Medullary Thyroid Cancer. Mol Cancer Res 2018; 17:751-760. [PMID: 30552230 DOI: 10.1158/1541-7786.mcr-18-0354] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 09/04/2018] [Accepted: 12/04/2018] [Indexed: 02/06/2023]
Abstract
Medullary thyroid carcinoma (MTC) originates from the C cells of the thyroid gland, which secrete calcitonin. Lymph node and distant metastases are frequently present at diagnosis. Activating mutations of RET, a driver oncogene in MTC that encodes a tyrosine kinase receptor, prevents apoptosis through inhibition of ATF4, a key transcriptional regulator of endoplasmic reticulum (ER) stress. We hypothesized that the combination of a tyrosine kinase inhibitor (TKI) and an ATF4 inducer promotes cell death by triggering catastrophic oxidative stress and apoptotic cell death. Here, we report that the ER-associated protein degradation (ERAD) inhibitor eeyarestatin sensitized MTC cells to the TKIs, sunitinib and vandetanib, thereby leading to synergistic upregulation of ATF4 expression, accumulation of reactive oxygen species, and subsequent cell death. Genome-wide analysis of ATF4 interaction sites by chromatin immunoprecipitation (ChIP) sequencing revealed that among ATF4 target genes was KLF9 (Kruppel-like factor 9), which induces MTC apoptosis. ChIP assays revealed that ATF4 occupancy at the KLF9 promoter was increased in MTC cells treated with eeyarestatin or vandetanib alone and was further enhanced in cells treated with both drugs, leading to increased KLF9 transcription. Depletion of ATF4 by shRNA led to downregulation of KLF9 expression and prevented oxidative stress-induced cell death. Furthermore, we identified ATF4 target genes (LZTFL1, MKNK2, and SIAH1 with known tumor suppressor function) that were synergistically upregulated with the combination of TKI and ERAD inhibitor. IMPLICATIONS: These findings reveal a combination therapy that induces reactive oxygen species-dependent catastrophic cell death through induction of ATF4 and KLF9 transcriptional activity.
Collapse
Affiliation(s)
- Rozita Bagheri-Yarmand
- Department of Endocrine Neoplasia and Hormonal Disorders, The University of Texas MD Anderson Cancer Center, Houston, Texas.
| | - Krishna M Sinha
- Department of Orthopedic Surgery, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, Texas
| | - Ling Li
- Department of Endocrine Neoplasia and Hormonal Disorders, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Yue Lu
- Department of Epigenetics and Molecular Carcinogenesis, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Gilbert J Cote
- Department of Endocrine Neoplasia and Hormonal Disorders, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Steven I Sherman
- Department of Endocrine Neoplasia and Hormonal Disorders, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Robert F Gagel
- Department of Endocrine Neoplasia and Hormonal Disorders, The University of Texas MD Anderson Cancer Center, Houston, Texas
| |
Collapse
|
5
|
Strzeszewska A, Alster O, Mosieniak G, Ciolko A, Sikora E. Insight into the role of PIKK family members and NF-кB in DNAdamage-induced senescence and senescence-associated secretory phenotype of colon cancer cells. Cell Death Dis 2018; 9:44. [PMID: 29352261 PMCID: PMC5833415 DOI: 10.1038/s41419-017-0069-5] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 10/13/2017] [Accepted: 10/17/2017] [Indexed: 12/12/2022]
Abstract
Senescence of cancer cells is an important outcome of treatment of many cancer types. Cell senescence is a permanent cell cycle arrest induced by stress conditions, including DNA damage. DNA damage activates DNA damage response (DDR), which involves members of the phosphatidylinositol 3-kinase-related kinase (PIKK) superfamily: protein kinases ATM, ATR, and DNA-PKcs. The so-far collected data indicate that ATM, with its downstream targets CHK2, p53, and p21, is the key protein involved in DDR-dependent senescence. It was also documented that the so-called senescence-associated secretory phenotype-SASP relies on ATM/CHK2, and not on p53 signaling. Moreover, genotoxic agents used in cancer treatment can activate NF-κB, which also induces transcription of SASP genes. In this paper, we have studied the involvement of three PIKK family members in colon cancer cell senescence and connection between DNA-damage-induced senescence and NF-κB-regulated SASP in p53-proficient and p53-deficient colon cancer cells treated with doxorubicin. We showed that doxorubicin induced cell senescence in both p53+/+ and p53−/− HCT116 cells, proving that this process is p53-independent. Senescence was successfully abrogated by a PIKK inhibitor, caffeine, or by simultaneous silencing of three PIKKs by specific siRNAs. By silencing individual members of PIKK family and analyzing common markers of senescence, the level of p21 and SA-β-Gal activity, we came to the conclusion that ATR kinase is crucial for the onset of senescence as, in contrast to ATM and DNA-PKsc, it could not be fully substituted by other PIKKs. Moreover, we showed that in case of silencing the three PIKKs, there was no SASP reduction accompanying the decrease in the level of p21 and SA-β-Gal (Senescence-Associated-β-Galactosidase) activity; whereas knocking down the NF-κB component, p65, abrogated SASP, but did not affect other markers of senescence, proving that DNA damage regulated senescence independently and NF-κB evoked SASP.
Collapse
Affiliation(s)
- Anna Strzeszewska
- Laboratory of the Molecular Bases of Ageing, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Olga Alster
- Laboratory of the Molecular Bases of Ageing, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Grażyna Mosieniak
- Laboratory of the Molecular Bases of Ageing, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Agata Ciolko
- Laboratory of the Molecular Bases of Ageing, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Ewa Sikora
- Laboratory of the Molecular Bases of Ageing, Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland.
| |
Collapse
|
6
|
Chwastek J, Jantas D, Lasoń W. The ATM kinase inhibitor KU-55933 provides neuroprotection against hydrogen peroxide-induced cell damage via a γH2AX/p-p53/caspase-3-independent mechanism: Inhibition of calpain and cathepsin D. Int J Biochem Cell Biol 2017; 87:38-53. [PMID: 28341201 DOI: 10.1016/j.biocel.2017.03.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 02/20/2017] [Accepted: 03/20/2017] [Indexed: 02/07/2023]
Abstract
The role of the kinase ataxia-telangiectasia mutated (ATM), a well-known protein engaged in DNA damage repair, in the regulation of neuronal responses to oxidative stress remains unexplored. Thus, the neuroprotective efficacy of KU-55933, a potent inhibitor of ATM, against cell damage evoked by oxidative stress (hydrogen peroxide, H2O2) has been studied in human neuroblastoma SH-SY5Y cells and compared with the efficacy of this agent in models of doxorubicin (Dox)- and staurosporine (St)-evoked cell death. KU-55933 inhibited the cell death induced by H2O2 or Dox but not by St in undifferentiated (UN-) and retinoic acid-differentiated (RA)-SH-SY5Y cells, with a more pronounced effect in the latter cell phenotype. Furthermore, this ATM inhibitor attenuated the Dox- but not H2O2-induced caspase-3 activity in both UN- and RA-SH-SY5Y cells. Although KU-55933 inhibited the H2O2- and Dox-induced activation of ATM, it attenuated the toxin-induced phosphorylation of the proteins H2AX and p53 only in the latter model of cell damage. Moreover, the ATM inhibitor prevented the H2O2-evoked increases in calpain and cathepsin D activity and attenuated cell damage to a similar degree as inhibitors of calpain (MDL28170) and cathepsin D (pepstatin A). Finally, we confirmed the neuroprotective potential of KU-55933 against the H2O2- and Dox-evoked cell damage in primary mouse cerebellar granule cells and in the mouse hippocampal HT-22 cell line. Altogether, our results extend the neuroprotective portfolio of KU-55933 to a model of oxidative stress, with this effect not involving inhibition of the γH2AX/p-p53/caspase-3 pathway and instead associated with the attenuation of calpain and cathepsin D activity.
Collapse
Affiliation(s)
- Jakub Chwastek
- Institute of Pharmacology, Polish Academy of Sciences, Department of Experimental Neuroendocrinology, Smętna Street 12, 31-343 Kraków, Poland
| | - Danuta Jantas
- Institute of Pharmacology, Polish Academy of Sciences, Department of Experimental Neuroendocrinology, Smętna Street 12, 31-343 Kraków, Poland.
| | - Władysław Lasoń
- Institute of Pharmacology, Polish Academy of Sciences, Department of Experimental Neuroendocrinology, Smętna Street 12, 31-343 Kraków, Poland
| |
Collapse
|
7
|
Li W, Gu X, Zhang X, Kong J, Ding N, Qi Y, Zhang Y, Wang J, Huang D. Cadmium delays non-homologous end joining (NHEJ) repair via inhibition of DNA-PKcs phosphorylation and downregulation of XRCC4 and Ligase IV. Mutat Res 2015. [PMID: 26201248 DOI: 10.1016/j.mrfmmm.2015.07.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Although studies have shown that cadmium (Cd) interfered with DNA damage repair (DDR), whether Cd could affect non-homologous end joining (NHEJ) repair remains elusive. To further understand the effect of Cd on DDR, we used X-ray irradiation of Hela cells as an in vitro model system, along with γH2AX and 53BP1 as markers for DNA damage. Results showed that X-ray significantly increased γH2AX and 53BP1 foci in Hela cells (p < 0.01), all of which are characteristic of accrued DNA damage. The number of foci declined rapidly over time (1-8h postirradiation), indicating an initiation of NHEJ process. However, the disappearance of γH2AX and 53BP1 foci was remarkably slowed by Cd pretreatment (p < 0.01), suggesting that Cd reduced the efficiency of NHEJ. To further elucidate the mechanisms of Cd toxicity, several markers of NHEJ pathway including Ku70, DNA-PKcs, XRCC4 and Ligase IV were examined. Our data showed that Cd altered the phosphorylation of DNA-PKcs, and reduced the expression of both XRCC4 and Ligase IV in irradiated cells. These observations are indicative of the impairment of NHEJ-dependent DNA repair pathways. In addition, zinc (Zn) mitigated the effects of Cd on NHEJ, suggesting that the Cd-induced NHEJ alteration may partly result from the displacement of Zn or from an interference with the normal function of Zn-containing proteins by Cd. Our findings provide a new insight into the toxicity of Cd on NHEJ repair and its underlying mechanisms in human cells.
Collapse
Affiliation(s)
- Weiwei Li
- Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China
| | - Xueyan Gu
- Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China
| | - Xiaoning Zhang
- Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China
| | - Jinxin Kong
- Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China
| | - Nan Ding
- Gansu Key laboratory of Space Radiobiology, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Yongmei Qi
- Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China
| | - Yingmei Zhang
- Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China
| | - Jufang Wang
- Gansu Key laboratory of Space Radiobiology, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Dejun Huang
- Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China.
| |
Collapse
|
8
|
Dendritic cells induce Th2-mediated airway inflammatory responses to house dust mite via DNA-dependent protein kinase. Nat Commun 2015; 6:6224. [PMID: 25692509 PMCID: PMC4333735 DOI: 10.1038/ncomms7224] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Accepted: 01/07/2015] [Indexed: 11/09/2022] Open
Abstract
DNA-dependent protein kinase (DNA-PK) mediates double-stranded DNA break repair, V(D)J recombination and immunoglobulin class switch recombination, as well as innate immune and pro-inflammatory responses. However, there is limited information regarding the role of DNA-PK in adaptive immunity mediated by dendritic cells (DCs), which are the primary antigen-presenting cells in allergic asthma. Here we show that house dust mite induces DNA-PK phosphorylation, which is a marker of DNA-PK activation, in DCs via the generation of intracellular reactive oxygen species. We also demonstrate that pharmacological inhibition of DNA-PK, as well as the specific deletion of DNA-PK in DCs, attenuates the induction of allergic sensitization and Th2 immunity via a mechanism that involves the impaired presentation of mite antigens. Furthermore, pharmacological inhibition of DNA-PK following antigen priming similarly reduces the manifestations of mite-induced airway disease. Collectively, these findings suggest that DNA-PK may be a potential target for treatment of allergic asthma.
Collapse
|
9
|
Rudolf E, Rezáčová K, Cervinka M. Activation of p38 and changes in mitochondria accompany autophagy to premature senescence-like phenotype switch upon chronic exposure to selenite in colon fibroblasts. Toxicol Lett 2014; 231:29-37. [PMID: 25204997 DOI: 10.1016/j.toxlet.2014.09.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Revised: 07/24/2014] [Accepted: 09/05/2014] [Indexed: 12/17/2022]
Abstract
Effects of chronic exposure to supranutritional sodium selenite (Se) were investigated in colonic fibroblasts. Initially, Se did not produce any gross changes in exposed cells; however, basal levels of autophagy were transiently increased and p38 activity was stimulated. From the 3rd week onwards, Se decreased cell proliferation, with corrensponding changes in cell cycle distribution. Also, in exposed cells oxidative stress and DNA damage slowly but gradually increased along with decreasing mitochondrial function and upon continued elevated activity of p38 kinase. Towards the end of the experiment, premature senescence features became more prominent in treated cells. Pharmacological inhibition as well as gene knockdown of these processes confirmed the involvement of p38 in balancing autophagy and premature senescence in cells exposed to Se and suggests that this element may in a given time frame compromise selected cell populations in digestive system.
Collapse
Affiliation(s)
- Emil Rudolf
- Department of Medical Biology and Genetics, Charles University in Prague, Faculty of Medicine in Hradec Králové, Šimkova 870, 500 38 Hradec Králové, Czech Republic.
| | - Kateřina Rezáčová
- Department of Medical Biology and Genetics, Charles University in Prague, Faculty of Medicine in Hradec Králové, Šimkova 870, 500 38 Hradec Králové, Czech Republic
| | - Miroslav Cervinka
- Department of Medical Biology and Genetics, Charles University in Prague, Faculty of Medicine in Hradec Králové, Šimkova 870, 500 38 Hradec Králové, Czech Republic
| |
Collapse
|
10
|
Tzeng TJ, Cao L, Fu Y, Zeng H, Cheng WH. Methylseleninic acid sensitizes Notch3-activated OVCA429 ovarian cancer cells to carboplatin. PLoS One 2014; 9:e101664. [PMID: 25010594 PMCID: PMC4092030 DOI: 10.1371/journal.pone.0101664] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Accepted: 06/10/2014] [Indexed: 11/18/2022] Open
Abstract
Ovarian cancer, the deadliest of gynecologic cancers, is usually not diagnosed until advanced stages. Although carboplatin has been popular for treating ovarian cancer for decades, patients eventually develop resistance to this platinum-containing drug. Expression of neurogenic locus notch homolog 3 (Notch3) is associated with chemoresistance and poor overall survival in ovarian cancer patients. Overexpression of NICD3 (the constitutively active form of Notch3) in OVCA429 ovarian cancer cells (OVCA429/NICD3) renders them resistance to carboplatin treatment compared to OVCA429/pCEG cells expressing an empty vector. We have previously shown that methylseleninic acid (MSeA) induces oxidative stress and activates ataxia-telangiectasia mutated and DNA-dependent protein kinase in cancer cells. Here we tested the hypothesis that MSeA and carboplatin exerted a synthetic lethal effect on OVCA429/NICD3 cells. Co-treatment with MSeA synergistically sensitized OVCA429/NICD3 but not OVCA429/pCEG cells to the killing by carboplatin. This synergism was associated with a cell cycle exit at the G2/M phase and the induction of NICD3 target gene HES1. Treatment of N-acetyl cysteine or inhibitors of the above two kinases did not directly impact on the synergism in OVCA429/NICD3 cells. Taken together, these results suggest that the efficacy of carboplatin in the treatment of high grade ovarian carcinoma can be enhanced by a combinational therapy with MSeA.
Collapse
Affiliation(s)
- Tiffany J. Tzeng
- Department of Nutrition and Food Science, University of Maryland, College Park, Maryland, United States of America
| | - Lei Cao
- Department of Food Science, Nutrition and Health Promotion, Mississippi State University, Mississippi State, Mississippi, United States of America
| | - YangXin Fu
- Department of Oncology, University of Alberta, Edmonton, Alberta, Canada
| | - Huawei Zeng
- USDA, Agriculture Research Service, Grand Forks Human Research Center, Grand Forks, North Dakota, United States of America
| | - Wen-Hsing Cheng
- Department of Nutrition and Food Science, University of Maryland, College Park, Maryland, United States of America
- Department of Food Science, Nutrition and Health Promotion, Mississippi State University, Mississippi State, Mississippi, United States of America
- * E-mail:
| |
Collapse
|
11
|
Zucker SN, Fink EE, Bagati A, Mannava S, Bianchi-Smiraglia A, Bogner PN, Wawrzyniak JA, Foley C, Leonova KI, Grimm MJ, Moparthy K, Ionov Y, Wang J, Liu S, Sexton S, Kandel ES, Bakin AV, Zhang Y, Kaminski N, Segal BH, Nikiforov MA. Nrf2 amplifies oxidative stress via induction of Klf9. Mol Cell 2014; 53:916-928. [PMID: 24613345 DOI: 10.1016/j.molcel.2014.01.033] [Citation(s) in RCA: 168] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Revised: 12/19/2013] [Accepted: 01/28/2014] [Indexed: 12/25/2022]
Abstract
Reactive oxygen species (ROS) activate NF-E2-related transcription factor 2 (Nrf2), a key transcriptional regulator driving antioxidant gene expression and protection from oxidant injury. Here, we report that in response to elevation of intracellular ROS above a critical threshold, Nrf2 stimulates expression of transcription Kruppel-like factor 9 (Klf9), resulting in further Klf9-dependent increases in ROS and subsequent cell death. We demonstrated that Klf9 independently causes increased ROS levels in various types of cultured cells and in mouse tissues and is required for pathogenesis of bleomycin-induced pulmonary fibrosis in mice. Mechanistically, Klf9 binds to the promoters and alters the expression of several genes involved in the metabolism of ROS, including suppression of thioredoxin reductase 2, an enzyme participating in ROS clearance. Our data reveal an Nrf2-dependent feedforward regulation of ROS and identify Klf9 as a ubiquitous regulator of oxidative stress and lung injury.
Collapse
Affiliation(s)
- Shoshanna N Zucker
- Department of Cell Stress Biology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Emily E Fink
- Department of Cell Stress Biology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Archis Bagati
- Department of Cell Stress Biology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Sudha Mannava
- Department of Cell Stress Biology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Anna Bianchi-Smiraglia
- Department of Cell Stress Biology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Paul N Bogner
- Department of Pathology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Joseph A Wawrzyniak
- Department of Cell Stress Biology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Colleen Foley
- Department of Cell Stress Biology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Katerina I Leonova
- Department of Cell Stress Biology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Melissa J Grimm
- Department of Medicine Immunology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Kalyana Moparthy
- Department of Cell Stress Biology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Yurij Ionov
- Department of Cancer Genetics, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Jianmin Wang
- Department of Biostatistics and Bioinformatics, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Song Liu
- Department of Biostatistics and Bioinformatics, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Sandra Sexton
- Department of Laboratory Animal Resources, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Eugene S Kandel
- Department of Cell Stress Biology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Andrei V Bakin
- Department of Cancer Genetics, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Yuesheng Zhang
- Department of Cancer Prevention and Control, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Naftali Kaminski
- Roswell Park Cancer Institute, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Brahm H Segal
- Department of Medicine Immunology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| | - Mikhail A Nikiforov
- Department of Cell Stress Biology, Buffalo, New York, 14263, USA, Department of Internal Medicine, Yale University, New Haven, Connecticut 06520 USA
| |
Collapse
|
12
|
Selenium supranutrition: are the potential benefits of chemoprevention outweighed by the promotion of diabetes and insulin resistance? Nutrients 2013; 5:1349-65. [PMID: 23603996 PMCID: PMC3705352 DOI: 10.3390/nu5041349] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 04/05/2013] [Accepted: 04/07/2013] [Indexed: 02/07/2023] Open
Abstract
Selenium was considered a toxin until 1957, when this mineral was shown to be essential in the prevention of necrotic liver damage in rats. The hypothesis of selenium chemoprevention is principally formulated by the observations that cancer incidence is inversely associated with selenium status. However, recent clinical and epidemiological studies demonstrate a role for some selenoproteins in exacerbating or promoting other disease states, specifically type 2 diabetes, although other data support a role of selenium in stimulating insulin sensitivity. Therefore, it is clear that our understanding in the role of selenium in glucose metabolism and chemoprevention is inadequate and incomplete. Research exploring the role of selenium in individual healthcare is of upmost importance and possibly will help explain how selenium is a double-edged sword in the pathologies of chronic diseases.
Collapse
|
13
|
Vinceti M, Crespi CM, Malagoli C, Del Giovane C, Krogh V. Friend or foe? The current epidemiologic evidence on selenium and human cancer risk. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART C, ENVIRONMENTAL CARCINOGENESIS & ECOTOXICOLOGY REVIEWS 2013; 31:305-41. [PMID: 24171437 PMCID: PMC3827666 DOI: 10.1080/10590501.2013.844757] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Scientific opinion on the relationship between selenium and the risk of cancer has undergone radical change over the years, with selenium first viewed as a possible carcinogen in the 1940s then as a possible cancer preventive agent in the 1960s-2000s. More recently, randomized controlled trials have found no effect on cancer risk but suggest possible low-dose dermatologic and endocrine toxicity, and animal studies indicate both carcinogenic and cancer-preventive effects. A growing body of evidence from human and laboratory studies indicates dramatically different biological effects of the various inorganic and organic chemical forms of selenium, which may explain apparent inconsistencies across studies. These chemical form-specific effects also have important implications for exposure and health risk assessment. Overall, available epidemiologic evidence suggests no cancer preventive effect of increased selenium intake in healthy individuals and possible increased risk of other diseases and disorders.
Collapse
Affiliation(s)
- Marco Vinceti
- Environmental, Genetic and Nutritional Epidemiology Research Center (CREAGEN), University of Modena and Reggio Emilia, Modena, Italy
- Department of Diagnostic, Clinical Medicine and Public Health Medicine, University of Modena and Reggio Emilia, Modena, Italy
| | - Catherine M. Crespi
- Department of Biostatistics, University of California Los Angeles Fielding School of Public Health, Los Angeles, California, USA
| | - Carlotta Malagoli
- Environmental, Genetic and Nutritional Epidemiology Research Center (CREAGEN), University of Modena and Reggio Emilia, Modena, Italy
- Department of Diagnostic, Clinical Medicine and Public Health Medicine, University of Modena and Reggio Emilia, Modena, Italy
| | - Cinzia Del Giovane
- Department of Diagnostic, Clinical Medicine and Public Health Medicine, University of Modena and Reggio Emilia, Modena, Italy
- Italian Cochrane Centre, University of Modena and Reggio Emilia, Modena, Modena, Italy
| | - Vittorio Krogh
- Epidemiology and Prevention Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
| |
Collapse
|