|
1
|
Steers GJ, O’Leary BR, Du J, Wagner BA, Carroll RS, Domann FE, Goswami PC, Buettner GR, Cullen JJ. Pharmacologic Ascorbate and DNMT Inhibitors Increase DUOX Expression and Peroxide-Mediated Toxicity in Pancreatic Cancer. Antioxidants (Basel) 2023; 12:1683. [PMID: 37759986 PMCID: PMC10525653 DOI: 10.3390/antiox12091683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/23/2023] [Accepted: 08/25/2023] [Indexed: 09/29/2023] Open
Abstract
Recent studies have demonstrated an important role for vitamin C in the epigenetic regulation of cancer-related genes via DNA demethylation by the ten-eleven translocation (TET) methylcytosine dioxygenase enzymes. DNA methyltransferase (DNMT) reverses this, increasing DNA methylation and decreasing gene expression. Dual oxidase (DUOX) enzymes produce hydrogen peroxide (H2O2) in normal pancreatic tissue but are silenced in pancreatic cancer (PDAC). Treatment of PDAC with pharmacologic ascorbate (P-AscH-, intravenous, high dose vitamin C) increases DUOX expression. We hypothesized that inhibiting DNMT may act synergistically with P-AscH- to further increase DUOX expression and cytotoxicity of PDAC. PDAC cells demonstrated dose-dependent increases in DUOX mRNA and protein expression when treated with DNMT inhibitors. PDAC cells treated with P-AscH- + DNMT inhibitors demonstrated increased DUOX expression, increased intracellular oxidation, and increased cytotoxicity in vitro and in vivo compared to either treatment alone. These findings suggest a potential therapeutic, epigenetic mechanism to treat PDAC.
Collapse
Affiliation(s)
- Garett J. Steers
- Free Radical and Radiation Biology Division, Department of Radiation Oncology, Iowa City, IA 52242, USA; (G.J.S.); (B.R.O.); (J.D.); (B.A.W.); (R.S.C.); (F.E.D.); (P.C.G.); (G.R.B.)
- The Department of Surgery, The University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Brianne R. O’Leary
- Free Radical and Radiation Biology Division, Department of Radiation Oncology, Iowa City, IA 52242, USA; (G.J.S.); (B.R.O.); (J.D.); (B.A.W.); (R.S.C.); (F.E.D.); (P.C.G.); (G.R.B.)
- The Department of Surgery, The University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Juan Du
- Free Radical and Radiation Biology Division, Department of Radiation Oncology, Iowa City, IA 52242, USA; (G.J.S.); (B.R.O.); (J.D.); (B.A.W.); (R.S.C.); (F.E.D.); (P.C.G.); (G.R.B.)
- The Department of Surgery, The University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Brett A. Wagner
- Free Radical and Radiation Biology Division, Department of Radiation Oncology, Iowa City, IA 52242, USA; (G.J.S.); (B.R.O.); (J.D.); (B.A.W.); (R.S.C.); (F.E.D.); (P.C.G.); (G.R.B.)
| | - Rory S. Carroll
- Free Radical and Radiation Biology Division, Department of Radiation Oncology, Iowa City, IA 52242, USA; (G.J.S.); (B.R.O.); (J.D.); (B.A.W.); (R.S.C.); (F.E.D.); (P.C.G.); (G.R.B.)
- The Department of Surgery, The University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Frederick E. Domann
- Free Radical and Radiation Biology Division, Department of Radiation Oncology, Iowa City, IA 52242, USA; (G.J.S.); (B.R.O.); (J.D.); (B.A.W.); (R.S.C.); (F.E.D.); (P.C.G.); (G.R.B.)
| | - Prabhat C. Goswami
- Free Radical and Radiation Biology Division, Department of Radiation Oncology, Iowa City, IA 52242, USA; (G.J.S.); (B.R.O.); (J.D.); (B.A.W.); (R.S.C.); (F.E.D.); (P.C.G.); (G.R.B.)
| | - Garry R. Buettner
- Free Radical and Radiation Biology Division, Department of Radiation Oncology, Iowa City, IA 52242, USA; (G.J.S.); (B.R.O.); (J.D.); (B.A.W.); (R.S.C.); (F.E.D.); (P.C.G.); (G.R.B.)
| | - Joseph J. Cullen
- Free Radical and Radiation Biology Division, Department of Radiation Oncology, Iowa City, IA 52242, USA; (G.J.S.); (B.R.O.); (J.D.); (B.A.W.); (R.S.C.); (F.E.D.); (P.C.G.); (G.R.B.)
- The Department of Surgery, The University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| |
Collapse
|
|
2
|
Pei Z, Wu K, Li Z, Li C, Zeng L, Li F, Pei N, Liu H, Zhang SL, Song YZ, Zhang X, Xu J, Fan XY, Wang J. Pharmacologic ascorbate as a pro-drug for hydrogen peroxide release to kill mycobacteria. Biomed Pharmacother 2018; 109:2119-2127. [PMID: 30551469 DOI: 10.1016/j.biopha.2018.11.078] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 11/12/2018] [Accepted: 11/19/2018] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND AND PURPOSE Tuberculosis is one of the most highly fatal diseases worldwide, and one-third of the world's population has been infected with Mycobacterium tuberculosis (M. tuberculosis). A previous study showed that M. tuberculosis was highly susceptible to being killed by ascorbate (i.e. vitamin C, VC), but the molecular mechanisms of the bactericidal activity of VC against M. tuberculosis are still not well understood. EXPERIMENTAL APPROACH We assayed the effects of VC as an anti-tuberculosis drug against mycobacteria (i.e. M. bovis BCG or M. tuberculosis H37Rv) in macrophages (i.e. RAW 264.7 cells). Relative global protein expression changes in 5 mM VC-treated and control samples of H37Rv were investigated by Tandem mass tag (TMT)-based quantitative proteomic analysis. qRT-PCR was also used to measure the differential expression of six intracellular stress response mycobacteria genes. KEY RESULTS Quantitative proteomic analysis showed that 11 peptide components including rip3, fdxA, Rv2028c, mtp, LH57_00670, hspX, pfkB, Rv1824, Rv1813c, LH57_08410 and Rv2030c were up-regulated and 17 peptide components were down-regulated in 5 mM VC-treated H37Rv compared with the control samples. qRT-PCR also verified that VC could induce the expression of six genes (hsp, fdxD, furA, devR, hspX, and dnaB) in BCG and H37Rv. We also found that exosomes from RAW 264.7 cells treated with pharmacologic VC could kill M. bovis BCG in vitro. CONCLUSION AND IMPLICATIONS Our results demonstrated that the bactericidal activity of VC against mycobacteria, as a pro-drug for hydrogen peroxide formation (H2O2), was dependent on reactive oxygen species production and the activated oxidative stress pathway, which suggested that pharmaceutical VC and exosomes from macrophages treated with VC could be used as potential anti-tuberculosis drugs.
Collapse
Affiliation(s)
- Zenglin Pei
- Scientific Research Center, Shanghai Public Health Clinical Center, Fudan University, Jinshan District, Shanghai, China
| | - Kang Wu
- Scientific Research Center, Shanghai Public Health Clinical Center, Fudan University, Jinshan District, Shanghai, China
| | - Zehuan Li
- Department of General Surgery, Zhongshan Hospital, Fudan University, Shanghai, China
| | - Chaoqun Li
- Department of Infectious Diseases, Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Ling Zeng
- Scientific Research Center, Shanghai Public Health Clinical Center, Fudan University, Jinshan District, Shanghai, China
| | - Feng Li
- Department of Respirology, Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Ning Pei
- TB Center, Shanghai Emerging and Re-emerging Infectious Disease Institute, Fudan University, Shanghai, China
| | - Hongmei Liu
- Scientific Research Center, Shanghai Public Health Clinical Center, Fudan University, Jinshan District, Shanghai, China
| | - Shu-Lin Zhang
- TB Center, Shanghai Emerging and Re-emerging Infectious Disease Institute, Fudan University, Shanghai, China; Department of Immunology and Microbiology, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Yan-Zheng Song
- TB Center, Shanghai Emerging and Re-emerging Infectious Disease Institute, Fudan University, Shanghai, China
| | - Xiaoyan Zhang
- Scientific Research Center, Shanghai Public Health Clinical Center, Fudan University, Jinshan District, Shanghai, China
| | - Jianqing Xu
- Scientific Research Center, Shanghai Public Health Clinical Center, Fudan University, Jinshan District, Shanghai, China
| | - Xiao-Yong Fan
- Scientific Research Center, Shanghai Public Health Clinical Center, Fudan University, Jinshan District, Shanghai, China; TB Center, Shanghai Emerging and Re-emerging Infectious Disease Institute, Fudan University, Shanghai, China.
| | - Jin Wang
- Scientific Research Center, Shanghai Public Health Clinical Center, Fudan University, Jinshan District, Shanghai, China.
| |
Collapse
|
|
3
|
Abstract
SIGNIFICANCE Ascorbate (Asc) is an essential compound both in animals and plants, mostly due to its reducing properties, thereby playing a role in scavenging reactive oxygen species (ROS) and acting as a cofactor in various enzymatic reactions. Recent Advances: Growing number of evidence shows that excessive Asc accumulation may have negative effects on cellular functions both in humans and plants; inter alia it may negatively affect signaling mechanisms, cellular redox status, and contribute to the production of ROS via the Fenton reaction. CRITICAL ISSUES Both plants and humans tightly control cellular Asc levels, possibly via biosynthesis, transport, and degradation, to maintain them in an optimum concentration range, which, among other factors, is essential to minimize the potentially harmful effects of Asc. On the contrary, the Fenton reaction induced by a high-dose Asc treatment in humans enables a potential cancer-selective cell death pathway. FUTURE DIRECTIONS The elucidation of Asc induced cancer selective cell death mechanisms may give us a tool to apply Asc in cancer therapy. On the contrary, the regulatory mechanisms controlling cellular Asc levels are also to be considered, for example, when aiming at generating crops with elevated Asc levels.
Collapse
Affiliation(s)
- Szilvia Z Tóth
- 1 Institute of Plant Biology , Biological Research Centre of the Hungarian Academy of Sciences, Szeged, Hungary
| | - Tamás Lőrincz
- 2 Laboratory of Biochemistry and Molecular Biology, Department of Applied Biotechnology and Food Science, Budapest University of Technology and Economics , Budapest, Hungary
| | - András Szarka
- 2 Laboratory of Biochemistry and Molecular Biology, Department of Applied Biotechnology and Food Science, Budapest University of Technology and Economics , Budapest, Hungary
| |
Collapse
|
|
4
|
Abstract
The gram-negative bacterium, Helicobacter pylori (H. pylori), infection is predominantly known for its strong association with development of gastric diseases, including gastritis, peptic ulcers, and stomach cancer. Numerous clinical reports show that ascorbic acid deficiency has been connect with gastritis. Vitamin C levels both in gastric acid and serum have constantly been affirmed to be low in subjects with H. pylori infected gastritis and peptic ulcers. Ascorbic acid supplementation likely relates to reduced incidences of bleeding from peptic ulcers and gastric cancer. H. pylori eradication is shown to increase vitamin C levels, while the benefits of ascorbic acid oral intake to increase the effectiveness of H. pylori-eradication therapy are controversial. Recent studies suggest that ascorbate intake intravenously, but not orally; pharmacologic ascorbate concentrations up to 30 mmol/L in blood, several millimolar in tissues as well as in interstitial fluid, are easily and safely achieved. Pharmacologic ascorbate can exert pro-oxidant effects locally as a drug by mediating hydrogen peroxide (H2O2) formation, which was applied to animal and clinical trials of cancer, sepsis, and severe burns etc. In this review, we summarize current understanding of the associations of vitamin C and H. pylori infection, and outline some potential strategies for H. pylori intervention from emerging advances on ascorbic acid physiology and pharmacology.
Collapse
Affiliation(s)
- Haixin Mei
- Department of Gastroenterology, Xinyang Central Hospital, Xinyang, China
| | - Hongbin Tu
- National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD, United States
| |
Collapse
|