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Hong GH, Lee SY, Kim IA, Suk J, Baeg C, Kim JY, Lee S, Kim KJ, Kim KT, Kim MG, Park KY. Effect of Heat-Treated Lactiplantibacillus plantarum nF1 on the Immune System Including Natural Killer Cell Activity: A Randomized, Placebo-Controlled, Double-Blind Study. Nutrients 2024; 16:1339. [PMID: 38732587 PMCID: PMC11085399 DOI: 10.3390/nu16091339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Revised: 04/26/2024] [Accepted: 04/27/2024] [Indexed: 05/13/2024] Open
Abstract
Heat-treated Lactiplantibacillus plantarum nF1 (HT-nF1) increases immune cell activation and the production of various immunomodulators (e.g., interleukin (IL)-12) as well as immunoglobulin (Ig) G, which plays an important role in humoral immunity, and IgA, which activates mucosal immunity. To determine the effect of HT-nF1 intake on improving immune function, a randomized, double-blind, placebo-controlled study was conducted on 100 subjects with normal white blood cell counts. The HT-nF1 group was administered capsules containing 5 × 1011 cells of HT-nF1 once a day for 8 weeks. After 8 weeks of HT-nF1 intake, significant changes in IL-12 were observed in the HT-nF1 group (p = 0.045). In particular, the change in natural killer (NK) cell activity significantly increased in subjects with low secretory (s) IgA (≤49.61 μg/mL) and low NK activity (E:T = 10:1) (≤3.59%). These results suggest that HT-nF1 has no safety issues and improves the innate immune function by regulating T helper (Th)1-related immune factors. Therefore, we confirmed that HT-nF1 not only has a positive effect on regulating the body's immunity, but it is also a safe material for the human body, which confirms its potential as a functional health food ingredient.
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Affiliation(s)
- Geun-Hye Hong
- IMMUNOBIOTECH Corp., Seoul 06628, Republic of Korea; (G.-H.H.); (S.-Y.L.)
| | - So-Young Lee
- IMMUNOBIOTECH Corp., Seoul 06628, Republic of Korea; (G.-H.H.); (S.-Y.L.)
| | - In Ah Kim
- Global Medical Research Center, Seoul 03737, Republic of Korea; (I.A.K.); (J.S.); (C.B.)
| | - Jangmi Suk
- Global Medical Research Center, Seoul 03737, Republic of Korea; (I.A.K.); (J.S.); (C.B.)
| | - Chaemin Baeg
- Global Medical Research Center, Seoul 03737, Republic of Korea; (I.A.K.); (J.S.); (C.B.)
| | - Ji Yeon Kim
- Department of Food Science and Biotechnology, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea; (J.Y.K.); (S.L.)
| | - Sehee Lee
- Department of Food Science and Biotechnology, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea; (J.Y.K.); (S.L.)
| | - Kyeong Jin Kim
- Department of Nano Bio Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea;
| | - Ki Tae Kim
- IMMUNOBIOTECH Corp., Seoul 06628, Republic of Korea; (G.-H.H.); (S.-Y.L.)
| | - Min Gee Kim
- IMMUNOBIOTECH Corp., Seoul 06628, Republic of Korea; (G.-H.H.); (S.-Y.L.)
| | - Kun-Young Park
- IMMUNOBIOTECH Corp., Seoul 06628, Republic of Korea; (G.-H.H.); (S.-Y.L.)
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Menchikov LG, Popov AV. Physiological Activity of Trace Element Germanium including Anticancer Properties. Biomedicines 2023; 11:1535. [PMID: 37371629 PMCID: PMC10295216 DOI: 10.3390/biomedicines11061535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 05/20/2023] [Accepted: 05/24/2023] [Indexed: 06/29/2023] Open
Abstract
Germanium is an essential microelement, and its deficiency can result in numerous diseases, particularly oncogenic conditions. Consequently, water-soluble germanium compounds, including inorganic and coordination compounds, have attracted significant attention due to their biological activity. The review analyzes the primary research from the last decade related to the anticancer activity of germanium compounds. Furthermore, the review clarifies their actual toxicity, identifies errors and misconceptions that have contributed to the discrediting of their biological activity, and briefly suggests a putative mechanism of germanium-mediated protection from oxidative stress. Finally, the review provides clarifications on the discovery history of water-soluble organic germanium compounds, which was distorted and suppressed for a long time.
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Affiliation(s)
- Leonid G. Menchikov
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prosp. 47, 119991 Moscow, Russia;
| | - Anatoliy V. Popov
- Department of Radiology, University of Pennsylvania, 3620 Hamilton Walk, Anatomy Chemistry Building, Rm 317, Philadelphia, PA 19104, USA
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Abdel Gaber SA, Hamza AH, Tantawy MA, Toraih EA, Ahmed HH. Germanium Dioxide Nanoparticles Mitigate Biochemical and Molecular Changes Characterizing Alzheimer's Disease in Rats. Pharmaceutics 2023; 15:pharmaceutics15051386. [PMID: 37242628 DOI: 10.3390/pharmaceutics15051386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 02/09/2023] [Accepted: 04/27/2023] [Indexed: 05/28/2023] Open
Abstract
Alzheimer's disease (AD) is a neurodegenerative disorder that jeopardizes the lives of diagnosed patients at late stages. This study aimed to assess, for the first time, the efficiency of germanium dioxide nanoparticles (GeO2NPs) in mitigating AD at the in vivo level compared to cerium dioxide nanoparticles (CeO2NPs). Nanoparticles were synthesized using the co-precipitation method. Their antioxidant activity was tested. For the bio-assessment, rats were randomly assigned into four groups: AD + GeO2NPs, AD + CeO2NPs, AD, and control. Serum and brain tau protein, phosphorylated tau, neurogranin, amyloid β peptide 1-42, acetylcholinesterase, and monoamine oxidase levels were measured. Brain histopathological evaluation was conducted. Furthermore, nine AD-related microRNAs were quantified. Nanoparticles were spherical with diameters ranging from 12-27 nm. GeO2NPs exhibited a stronger antioxidant activity than CeO2NPs. Serum and tissue analyses revealed the regression of AD biomarkers to almost control values upon treatment using GeO2NPs. Histopathological observations strongly supported the biochemical outcomes. Then, miR-29a-3p was down-regulated in the GeO2NPs-treated group. This pre-clinical study substantiated the scientific evidence favoring the pharmacological application of GeO2NPs and CeO2NPs in AD treatment. Our study is the first report on the efficiency of GeO2NPs in managing AD. Further studies are needed to fully understand their mechanism of action.
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Affiliation(s)
- Sara A Abdel Gaber
- Nanomedicine Department, Institute of Nanoscience and Nanotechnology, Kafrelsheikh University, Kafr El Sheikh 33516, Egypt
| | - Amal H Hamza
- Biochemistry and Nutrition Department, Faculty of Women, Ain Shams University, Cairo 11566, Egypt
| | - Mohamed A Tantawy
- Hormones Department, Medical Research and Clinical Studies Institute, National Research Center, Dokki, Giza 12622, Egypt
- Stem Cell Lab, left of Excellence for Advanced Sciences, National Research Centre, Dokki, Giza 12622, Egypt
| | - Eman A Toraih
- Genetics Unit, Histology and Cell Biology Department, Faculty of Medicine, Suez Canal University, Ismailia 41522, Egypt
| | - Hanaa H Ahmed
- Hormones Department, Medical Research and Clinical Studies Institute, National Research Center, Dokki, Giza 12622, Egypt
- Stem Cell Lab, left of Excellence for Advanced Sciences, National Research Centre, Dokki, Giza 12622, Egypt
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Realizing Both Antibacterial Activity and Cytocompatibility in Silicocarnotite Bioceramic via Germanium Incorporation. J Funct Biomater 2023; 14:jfb14030154. [PMID: 36976078 PMCID: PMC10054726 DOI: 10.3390/jfb14030154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/09/2023] [Accepted: 03/10/2023] [Indexed: 03/16/2023] Open
Abstract
The treatment of infective or potentially infectious bone defects is a critical problem in the orthopedic clinic. Since bacterial activity and cytocompatibility are always contrary factors, it is hard to have them both in one material. The development of bioactive materials with a good bacterial character and without sacrificing biocompatibility and osteogenic activity, is an interesting and valuable research topic. In the present work, the antimicrobial characteristic of germanium, GeO2 was used to enhance the antibacterial properties of silicocarnotite (Ca5(PO4)2SiO4, CPS). In addition, its cytocompatibility was also investigated. The results demonstrated that Ge–CPS can effectively inhibit the proliferation of both Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), and it showed no cytotoxicity to rat bone marrow-derived mesenchymal stem cells (rBMSCs). In addition, as the bioceramic degraded, a sustainable release of germanium could be achieved, ensuring long-term antibacterial activity. The results indicated that Ge–CPS has excellent antibacterial activity compared with pure CPS, while no obvious cytotoxicity was observed, which could make it a promising candidate for the bone repair of infected bone defects.
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Menchikov LG, Shestov AA, Popov AV. Warburg Effect Revisited: Embodiment of Classical Biochemistry and Organic Chemistry. Current State and Prospects. BIOCHEMISTRY (MOSCOW) 2023; 88:S1-S20. [PMID: 37069111 DOI: 10.1134/s0006297923140018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
The Nobel Prize Winner (1931) Dr. Otto H. Warburg had established that the primary energy source of the cancer cell is aerobic glycolysis (the Warburg effect). He also postulated the hypothesis about "the prime cause of cancer", which is a matter of debate nowadays. Contrary to the hypothesis, his discovery was recognized entirely. However, the discovery had almost vanished in the heat of battle about the hypothesis. The prime cause of cancer is essential for the prevention and diagnosis, yet the effects that influence tumor growth are more important for cancer treatment. Due to the Warburg effect, a large amount of data has been accumulated on biochemical changes in the cell and the organism as a whole. Due to the Warburg effect, the recovery of normal biochemistry and oxygen respiration and the restoration of the work of mitochondria of cancer cells can inhibit tumor growth and lead to remission. Here, we review the current knowledge on the inhibition of abnormal glycolysis, neutralization of its consequences, and normalization of biochemical parameters, as well as recovery of oxygen respiration of a cancer cell and mitochondrial function from the point of view of classical biochemistry and organic chemistry.
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Affiliation(s)
- Leonid G Menchikov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, 119991, Russian Federation
| | - Alexander A Shestov
- University of Pennsylvania, Department of Pathology and Laboratory Medicine, Perelman Center for Advanced Medicine, Philadelphia, PA 19104, USA
| | - Anatoliy V Popov
- University of Pennsylvania, Department of Radiology, Philadelphia, PA 19104, USA.
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Srivastava S, Dubey AK, Madaan R, Bala R, Gupta Y, Dhiman BS, Kumar S. Emergence of nutrigenomics and dietary components as a complementary therapy in cancer prevention. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:89853-89873. [PMID: 36367649 DOI: 10.1007/s11356-022-24045-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Accepted: 11/02/2022] [Indexed: 06/16/2023]
Abstract
Cancer is an illness characterized by abnormal cell development and the capability to infiltrate or spread to rest of the body. A tumor is the term for this abnormal growth that develops in solid tissues like an organ, muscle, or bone and can spread to other parts of the body through the blood and lymphatic systems. Nutrition is a critical and immortal environmental component in the development of all living organisms encoding the relationship between a person's nutrition and their genes. Nutrients have the ability to modify gene expression and persuade alterations in DNA and protein molecules which is researched scientifically in nutrigenomics. These interactions have a significant impact on the pharmacokinetic properties of bioactive dietary components as well as their site of action/molecular targets. Nutrigenomics encompasses nutrigenetics, epigenetics, and transcriptomics as well as other "omic" disciplines like proteomics and metabolomics to explain the vast disparities in cancer risk among people with roughly similar life style. Clinical trials and researches have evidenced that alternation of dietary habits is potentially one of the key approaches for reducing cancer risk in an individual. In this article, we will target how nutrigenomics and functional food work as preventive therapy in reducing the risk of cancer.
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Affiliation(s)
| | - Ankit Kumar Dubey
- Institute of Scholars, Bengaluru, 577102, Karnataka, India.
- iGlobal Research and Publishing Foundation, New Delhi, 110059, India.
| | - Reecha Madaan
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Rajni Bala
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Yugam Gupta
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | | | - Suresh Kumar
- Department of Pharmaceutical Sciences and Drug Research, Punjabi University, Patiala, 147002, Punjab, India
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Potential of germanium-based compounds in coronavirus infection. ACTA PHARMACEUTICA (ZAGREB, CROATIA) 2022; 72:245-258. [PMID: 36651511 DOI: 10.2478/acph-2022-0016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/18/2021] [Indexed: 01/20/2023]
Abstract
The first germanium compounds which exhibited immunomodulatory and antiviral effects were sesquioxane-type germanates. To date, more than a dozen compounds containing germanium have been synthesized and are being actively studied. They include germanium carboxylates and citrates, complexes of germanium with resveratrol, daphnetin, mangiferin, chrysin, quercetin, ascorbic and nicotinic acids, amino acids, gamma-lactones, germanium-containing spirulina, yeast and others. Germanium-based compounds have shown the ability to influence the replication of various DNA/RNA viruses, stimulate the body's natural resistance, prevent the development of metabolic intoxication of various origin, increase the efficacy of vaccines, and prevent the development of excessive accumulation of reactive oxygen species, which plays a decisive role in the development of inflammatory response caused by a viral infection. It seems reasonable to say that germanium-based complex compounds effectively contribute to the preservation of high--energy bonds in the form of ATP, optimize the activity of metabolic processes by re-oxygenation, and exhibit antimicrobial activity. The purpose of this review is to summarize the pharmacological potential of various germanium-based compounds studied nowadays, taking into account their mechanisms of action, and to analyze their prospects in the development of integrated approaches in the prevention and treatment of SARS-CoV-2 infection.
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Killilea DW, Killilea AN. Mineral requirements for mitochondrial function: A connection to redox balance and cellular differentiation. Free Radic Biol Med 2022; 182:182-191. [PMID: 35218912 DOI: 10.1016/j.freeradbiomed.2022.02.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 02/16/2022] [Accepted: 02/21/2022] [Indexed: 12/20/2022]
Abstract
Professor Bruce Ames demonstrated that nutritional recommendations should be adjusted in order to 'tune-up' metabolism and reduce mitochondria decay, a hallmark of aging and many disease processes. A major subset of tunable nutrients are the minerals, which despite being integral to every aspect of metabolism are often deficient in the typical Western diet. Mitochondria are particularly rich in minerals, where they function as essential cofactors for mitochondrial physiology and overall cellular health. Yet substantial knowledge gaps remain in our understanding of the form and function of these minerals needed for metabolic harmony. Some of the minerals have known activities in the mitochondria but with incomplete regulatory detail, whereas other minerals have no established mitochondrial function at all. A comprehensive metallome of the mitochondria is needed to fully understand the patterns and relationships of minerals within metabolic processes and cellular development. This brief overview serves to highlight the current progress towards understanding mineral homeostasis in the mitochondria and to encourage more research activity in key areas. Future work may likely reveal that adjusting the amounts of specific nutritional minerals has longevity benefits for human health.
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Affiliation(s)
- David W Killilea
- Office of Research, University of California, San Francisco, CA, USA.
| | - Alison N Killilea
- Department of Molecular & Cell Biology, University of California, Berkeley, CA, USA
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Alimbarova LM, Ambrosov IV, Matelo SK, Barinsky IF. [Antiviral activity of the organic germanium complex with aciclovir against herpes simplex virus (Herpesviridae: Alphaherpesvirinae: Simplexvirus: Human alphaherpesvirus 1/2) in the in vitro and in vivo systems]. Vopr Virusol 2021; 66:368-382. [PMID: 34738452 DOI: 10.36233/0507-4088-76] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 11/04/2021] [Indexed: 11/05/2022]
Abstract
INTRODUCTION A significant increase in the incidence of various forms of herpesvirus infection (HVI) determines the need to search for new approaches to the modification of one of the basic antiviral drugs aciclovir (ACV) and its dosage forms to improve their biopharmaceutical characteristics and increase the effectiveness of therapy. In this aspect, an innovative organic germanium complex with aciclovir (OGCA) is promising.The aim of the study was to assess the antiviral activity of OGCA against the herpes simplex virus (HSV) (human herpes virus, HHV) on the HVI models both in vitro and in vivo. MATERIAL AND METHODS We studied the activity of OGCA in a therapeutic regimen against HSV-1 (HHV-1) (Kl strain), HSV-2 (HHV-2) (VN strain) using virological and statistical research methods in the in vitro model of HVI on Vero cell culture and the model of genital herpes (GH) caused by HHV-2 (VN strain) in male guinea pigs (Canis porcellus). RESULTS AND DISCUSSION It was found OGCA inhibits the replication of HHV-1 and HHV-2 in Vero cells, and has anti-HHV activity in the GH model in male guinea pigs, leading to a decrease in the severity and duration of the disease, the intensity and duration of viral shedding. The most pronounced activity was detected when preparation was applied topically 5 times a day for 5 days at the early stages of infection (3% gel). The delayed use of OGCA (48 hours after infection) also had statistically significant efficacy compared to commercial reference drugs containing aciclovir or its pro-drugs: aciclovir (5% cream), AIL (acyclovir+interferon alfa-2b+lidocaine, 3% ointment), penciclovir (1% cream). OGCA significantly reduced the number of days of the pathogen shedding, as well as its infectivity, compared to animals in the control group and ones receiving placebo. The activity of OGCA, apparently, is due to its improved biopharmaceutical characteristics compared to aciclovir, as well as the presence of a number of biological activities of its constituent components. CONCLUSION The results of the study allow us to consider OGCA as the basis for the development of antiviral agents for the treatment of HVI.
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Affiliation(s)
- L M Alimbarova
- FSBI «National Research Centre for Epidemiology and Microbiology named after the honorary academician N.F. Gamaleya» of the Ministry of Health of Russia
| | | | | | - I F Barinsky
- FSBI «National Research Centre for Epidemiology and Microbiology named after the honorary academician N.F. Gamaleya» of the Ministry of Health of Russia
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Cho JM, Yoo D, Lee JY, Oh MS, Ha KC, Baek HI, Lee SM, Lee JH, Yoo HJ. Supplementation with a Natural Source of Amino Acids, Sil-Q1 (Silk Peptide), Enhances Natural Killer Cell Activity: A Redesigned Clinical Trial with a Reduced Supplementation Dose and Minimized Seasonal Effects in a Larger Population. Nutrients 2021; 13:2930. [PMID: 34578808 PMCID: PMC8466343 DOI: 10.3390/nu13092930] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Revised: 08/10/2021] [Accepted: 08/19/2021] [Indexed: 11/25/2022] Open
Abstract
The aim of this study was to re-validate the changes in natural killer (NK) cell cytotoxicity and cytokines related to T cells after Sil-Q1 (SQ; silk peptide) supplementation in a larger pool of Korean adults with minimized daily dose of SQ and controlling seasonal influence compared to the previous study. A total of 130 subjects were randomly assigned (1:1) to consume either 7.5 g of SQ or placebo for 8 weeks. NK cell cytotoxicity and cytokines were measured at T0 (baseline) and T8 (follow-up). Comparing the NK cell cytotoxicity values at T0 and T8 within each group, the cytotoxicity at all effector cell (E) to target cell (T) ratios of 10:1, 5:1, 2.5:1, and 1.25:1 was significantly increased in the SQ group at T8. Additionally, significant differences in the changed value (Δ, subtract baseline values from follow-up values) comparison between the groups at E:T = 10:1, 5:1, and 2.5:1 were found. As a secondary endpoint, the interleukin (IL)-12 level in the SQ group was significantly increased for 8 weeks, and Δ IL-12 in the SQ group was greater than in the placebo group. In conclusion, the present study showed considerable practical implications of SQ supplementation. Thus, SQ is an effective and safe functional food supplement for enhancing immune function.
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Affiliation(s)
- Jung Min Cho
- National Leading Research Laboratory of Clinical Nutrigenetics/Nutrigenomics, Department of Food and Nutrition, College of Human Ecology, Yonsei University, Seoul 03722, Korea; (J.M.C.); (D.Y.); (J.H.L.)
| | - Dokyeong Yoo
- National Leading Research Laboratory of Clinical Nutrigenetics/Nutrigenomics, Department of Food and Nutrition, College of Human Ecology, Yonsei University, Seoul 03722, Korea; (J.M.C.); (D.Y.); (J.H.L.)
| | - Jeong-Yong Lee
- WORLDWAY Co., Ltd., Sejong-si 30003, Korea; (J.-Y.L.); (M.-S.O.)
| | - Mi-Sun Oh
- WORLDWAY Co., Ltd., Sejong-si 30003, Korea; (J.-Y.L.); (M.-S.O.)
| | - Ki-Chan Ha
- Healthcare Claims & Management Inc., Jeonju 54810, Korea; (K.-C.H.); (H.-I.B.)
| | - Hyang-Im Baek
- Healthcare Claims & Management Inc., Jeonju 54810, Korea; (K.-C.H.); (H.-I.B.)
| | - Seung-Min Lee
- Brain Korea 21 PLUS Project, Department of Food and Nutrition, College of Human Ecology, Yonsei University, Seoul 03722, Korea;
- Research Center for Silver Science, Institute of Symbiotic Life-TECH, Yonsei University, Seoul 03722, Korea
| | - Jong Ho Lee
- National Leading Research Laboratory of Clinical Nutrigenetics/Nutrigenomics, Department of Food and Nutrition, College of Human Ecology, Yonsei University, Seoul 03722, Korea; (J.M.C.); (D.Y.); (J.H.L.)
- Research Center for Silver Science, Institute of Symbiotic Life-TECH, Yonsei University, Seoul 03722, Korea
| | - Hye Jin Yoo
- National Leading Research Laboratory of Clinical Nutrigenetics/Nutrigenomics, Department of Food and Nutrition, College of Human Ecology, Yonsei University, Seoul 03722, Korea; (J.M.C.); (D.Y.); (J.H.L.)
- Research Center for Silver Science, Institute of Symbiotic Life-TECH, Yonsei University, Seoul 03722, Korea
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Zemek J, Jiricek P, Houdkova J, Ledinsky M, Jelinek M, Kocourek T. On the Origin of Reduced Cytotoxicity of Germanium-Doped Diamond-Like Carbon: Role of Top Surface Composition and Bonding. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:567. [PMID: 33668693 PMCID: PMC7996325 DOI: 10.3390/nano11030567] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 02/18/2021] [Accepted: 02/19/2021] [Indexed: 12/28/2022]
Abstract
This work attempts to understand the behaviour of Ge-induced cytotoxicity of germanium-doped hydrogen-free diamond-like carbon (DLC) films recently thoroughly studied and published by Jelinek et al. At a low doping level, the films showed no cytotoxicity, while at a higher doping level, the films were found to exhibit medium to high cytotoxicity. We demonstrate, using surface-sensitive methods-two-angle X-ray-induced core-level photoelectron spectroscopy (ARXPS) and Low Energy Ion Scattering (LEIS) spectroscopy, that at a low doping level, the layers are capped by a carbon film which impedes the contact of Ge species with tissue. For higher Ge content in the DLC films, oxidized Ge species are located at the top surface of the layers, provoking cytotoxicity. The present results indicate no threshold for Ge concentration in cell culture substrate to avoid a severe toxic reaction.
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Affiliation(s)
- Josef Zemek
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8, Czech Republic; (P.J.); (J.H.); (M.L.); (M.J.); (T.K.)
| | - Petr Jiricek
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8, Czech Republic; (P.J.); (J.H.); (M.L.); (M.J.); (T.K.)
| | - Jana Houdkova
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8, Czech Republic; (P.J.); (J.H.); (M.L.); (M.J.); (T.K.)
| | - Martin Ledinsky
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8, Czech Republic; (P.J.); (J.H.); (M.L.); (M.J.); (T.K.)
| | - Miroslav Jelinek
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8, Czech Republic; (P.J.); (J.H.); (M.L.); (M.J.); (T.K.)
- Faculty of Biomedical Engineering, Czech Technical University in Prague, nam. Sitna 3105, 27201 Kladno, Czech Republic
| | - Tomas Kocourek
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8, Czech Republic; (P.J.); (J.H.); (M.L.); (M.J.); (T.K.)
- Faculty of Biomedical Engineering, Czech Technical University in Prague, nam. Sitna 3105, 27201 Kladno, Czech Republic
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