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Lamela F, Bologna-Molina R, Parietti F, Pereira-Prado V, Millán M, Silva A, Llaguno J, Alonso J, Fernández A, Sotelo-Silveira J, Domingues M, Arocena M, Hochmann J. Differential effects of coverslip-induced hypoxia and cobalt chloride mimetic hypoxia on cellular stress, metabolism, and nuclear structure. Tissue Cell 2024; 88:102408. [PMID: 38772273 DOI: 10.1016/j.tice.2024.102408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 05/03/2024] [Accepted: 05/10/2024] [Indexed: 05/23/2024]
Abstract
Hypoxia has profound effects on cell physiology, both in normal or pathological settings like cancer. In this study, we asked whether a variant of coverslip-induced hypoxia that recapitulates the conditions found in the tumor microenvironment would elicit similar cellular responses compared to the well established model of cobalt chloride-induced hypoxia. Comparable levels of nuclear HIF-1α were observed after 24 h of coverslip-induced hypoxia or cobalt chloride treatment in CAL-27 oral squamous carcinoma cells. However, cellular stress levels assessed by reactive oxygen species production and lipid droplet accumulation were markedly increased in coverslip-induced hypoxia compared to cobalt chloride treatment. Conversely, mitochondrial ATP production sharply decreased after coverslip-induced hypoxia but was preserved in the presence of cobalt chloride. Coverslip-induced hypoxia also had profound effects in nuclear organization, assessed by changes in nuclear dry mass distribution, whereas these effects were much less marked after cobalt chloride treatment. Taken together, our results show that coverslip-induced hypoxia effects on cell physiology and structure are more pronounced than mimetic hypoxia induced by cobalt chloride treatment. Considering also the simplicity of coverslip-induced hypoxia, our results therefore underscore the usefulness of this method to recapitulate in vitro the effects of hypoxic microenvironments encountered by cells in vivo.
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Affiliation(s)
- Florencia Lamela
- Departamento de Diagnóstico en Patología y Medicina Oral, Facultad de Odontología, Universidad de la República, Uruguay
| | - Ronell Bologna-Molina
- Departamento de Diagnóstico en Patología y Medicina Oral, Facultad de Odontología, Universidad de la República, Uruguay
| | - Felipe Parietti
- Departamento de Diagnóstico en Patología y Medicina Oral, Facultad de Odontología, Universidad de la República, Uruguay
| | - Vanesa Pereira-Prado
- Departamento de Diagnóstico en Patología y Medicina Oral, Facultad de Odontología, Universidad de la República, Uruguay
| | - Magdalena Millán
- Departamento de Diagnóstico en Patología y Medicina Oral, Facultad de Odontología, Universidad de la República, Uruguay; Departamento de Genómica, Instituto de Investigaciones Biológicas Clemente Estable, Uruguay
| | - Alejandro Silva
- Instituto de Física, Facultad de Ingeniería, Universidad de la República, Montevideo, Uruguay
| | - Juan Llaguno
- Instituto de Física, Facultad de Ingeniería, Universidad de la República, Montevideo, Uruguay
| | - Julia Alonso
- Instituto de Física, Facultad de Ingeniería, Universidad de la República, Montevideo, Uruguay
| | - Ariel Fernández
- Instituto de Física, Facultad de Ingeniería, Universidad de la República, Montevideo, Uruguay
| | - José Sotelo-Silveira
- Departamento de Genómica, Instituto de Investigaciones Biológicas Clemente Estable, Uruguay; Sección Biología Celular, Facultad de Ciencias, Universidad de la República, Uruguay
| | - Manoela Domingues
- Departamento de Odontología Conservadora, Faculdade de Odontología, Universidade Federal do Río Grande Do Sul, Brazil
| | - Miguel Arocena
- Departamento de Genómica, Instituto de Investigaciones Biológicas Clemente Estable, Uruguay; Departamento de Biología Odontológica, Facultad de Odontología, Universidad de la República, Uruguay.
| | - Jimena Hochmann
- Departamento de Diagnóstico en Patología y Medicina Oral, Facultad de Odontología, Universidad de la República, Uruguay; Departamento de Genómica, Instituto de Investigaciones Biológicas Clemente Estable, Uruguay.
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Yamasaki T, Mori W, Ohkubo T, Hiraishi A, Zhang Y, Kurihara Y, Nengaki N, Tashima H, Fujinaga M, Zhang MR. Potential for in vivo visualization of intracellular pH gradient in the brain using PET imaging. Brain Commun 2024; 6:fcae172. [PMID: 38863573 PMCID: PMC11166174 DOI: 10.1093/braincomms/fcae172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 04/16/2024] [Accepted: 05/22/2024] [Indexed: 06/13/2024] Open
Abstract
Intracellular pH is a valuable index for predicting neuronal damage and injury. However, no PET probe is currently available for monitoring intracellular pH in vivo. In this study, we developed a new approach for visualizing the hydrolysis rate of monoacylglycerol lipase, which is widely distributed in neurons and astrocytes throughout the brain. This approach uses PET with the new radioprobe [11C]QST-0837 (1,1,1,3,3,3-hexafluoropropan-2-yl-3-(1-phenyl-1H-pyrazol-3-yl)azetidine-1-[11C]carboxylate), a covalent inhibitor containing an azetidine carbamate skeleton for monoacylglycerol lipase. The uptake and residence of this new radioprobe depends on the intracellular pH gradient, and we evaluated this with in silico, in vitro and in vivo assessments. Molecular dynamics simulations predicted that because the azetidine carbamate moiety is close to that of water molecules, the compound containing azetidine carbamate would be more easily hydrolyzed following binding to monoacylglycerol lipase than would its analogue containing a piperidine carbamate skeleton. Interestingly, it was difficult for monoacylglycerol lipase to hydrolyze the azetidine carbamate compound under weakly acidic (pH 6) conditions because of a change in the interactions with water molecules on the carbamate moiety of their complex. Subsequently, an in vitro assessment using rat brain homogenate to confirm the molecular dynamics simulation-predicted behaviour of the azetidine carbamate compound showed that [11C]QST-0837 reacted with monoacylglycerol lipase to yield an [11C]complex, which was hydrolyzed to liberate 11CO2 as a final product. Additionally, the 11CO2 liberation rate was slower at lower pH. Finally, to indicate the feasibility of estimating how the hydrolysis rate depends on intracellular pH in vivo, we performed a PET study with [11C]QST-0837 using ischaemic rats. In our proposed in vivo compartment model, the clearance rate of radioactivity from the brain reflected the rate of [11C]QST-0837 hydrolysis (clearance through the production of 11CO2) in the brain, which was lower in a remarkably hypoxic area than in the contralateral region. In conclusion, we indicated the potential for visualization of the intracellular pH gradient in the brain using PET imaging, although some limitations remain. This approach should permit further elucidation of the pathological mechanisms involved under acidic conditions in multiple CNS disorders.
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Affiliation(s)
- Tomoteru Yamasaki
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Wakana Mori
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Takayuki Ohkubo
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
- SHI Accelerator Service Co. Ltd., Tokyo 141-0031, Japan
| | - Atsuto Hiraishi
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Yiding Zhang
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Yusuke Kurihara
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
- SHI Accelerator Service Co. Ltd., Tokyo 141-0031, Japan
| | - Nobuki Nengaki
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
- SHI Accelerator Service Co. Ltd., Tokyo 141-0031, Japan
| | - Hideaki Tashima
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Masayuki Fujinaga
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Ming-Rong Zhang
- Department of Advanced Nuclear Medicine Sciences, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
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Hochmann J, Millán M, Hernández P, Lafon-Hughes L, Aiuto ND, Silva A, Llaguno J, Alonso J, Fernández A, Pereira-Prado V, Sotelo-Silveira J, Bologna-Molina R, Arocena M. Contributions of viral oncogenes of HPV-18 and hypoxia to oxidative stress and genetic damage in human keratinocytes. Sci Rep 2023; 13:17734. [PMID: 37853061 PMCID: PMC10584980 DOI: 10.1038/s41598-023-44880-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Accepted: 10/12/2023] [Indexed: 10/20/2023] Open
Abstract
Infection with high-risk human papillomaviruses like HPV-16 and HPV-18 is highly associated with the development of cervical and other cancers. Malignant transformation requires viral oncoproteins E5, E6 and E7, which promote cell proliferation and increase DNA damage. Oxidative stress and hypoxia are also key factors in cervical malignant transformation. Increased levels of reactive species of oxygen (ROS) and nitrogen (RNS) are found in the hypoxic tumor microenvironment, promoting genetic instability and invasiveness. In this work, we studied the combined effect of E5, E6 and E7 and hypoxia in increasing oxidative stress and promoting DNA damage and nuclear architecture alterations. HaCaT cells containing HPV-18 viral oncogenes (HaCaT E5/E6/E7-18) showed higher ROS levels in normoxia and higher levels of RNS in hypoxia compared to HaCaT parental cells, as well as higher genetic damage in hypoxia as measured by γH2AX and comet assays. In hypoxia, HaCaT E5/E6/E7-18 increased its nuclear dry mass and both cell types displayed marked heterogeneity in nuclear dry mass distribution and increased nuclear foci. Our results show contributions of both viral oncogenes and hypoxia to oxidative stress, DNA damage and altered nuclear architecture, exemplifying how an altered microenvironment combines with oncogenic transformation to promote tumor progression.
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Affiliation(s)
- Jimena Hochmann
- Departamento de Genómica, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay.
- Departamento de Diagnóstico en Patología y Medicina Bucal, Facultad de Odontología, Universidad de la República, General Las Heras 1925, Montevideo, Uruguay.
| | - Magdalena Millán
- Departamento de Genómica, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay
| | - Paola Hernández
- Departamento de Genética, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay
| | - Laura Lafon-Hughes
- Departamento de Genética, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay
- Grupo de Biofisicoquímica, Departamento de Ciencias Biológicas, Centro Universitario Regional Litoral Norte -Sede Salto, Universidad de la República (CENUR LN, UdelaR), Montevideo, Uruguay
| | - Natali D' Aiuto
- Departamento de Genómica, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay
- Departamento de Biología Odontológica, Facultad de Odontología, Universidad de la República, General Las Heras 1925, Montevideo, Uruguay
| | - Alejandro Silva
- Instituto de Física, Facultad de Ingeniería, Universidad de la República, Montevideo, Uruguay
| | - Juan Llaguno
- Instituto de Física, Facultad de Ingeniería, Universidad de la República, Montevideo, Uruguay
| | - Julia Alonso
- Instituto de Física, Facultad de Ingeniería, Universidad de la República, Montevideo, Uruguay
| | - Ariel Fernández
- Instituto de Física, Facultad de Ingeniería, Universidad de la República, Montevideo, Uruguay
| | - Vanesa Pereira-Prado
- Departamento de Diagnóstico en Patología y Medicina Bucal, Facultad de Odontología, Universidad de la República, General Las Heras 1925, Montevideo, Uruguay
| | - José Sotelo-Silveira
- Departamento de Genómica, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay
- Sección Biología Celular, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay
| | - Ronell Bologna-Molina
- Departamento de Diagnóstico en Patología y Medicina Bucal, Facultad de Odontología, Universidad de la República, General Las Heras 1925, Montevideo, Uruguay
| | - Miguel Arocena
- Departamento de Genómica, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay.
- Departamento de Biología Odontológica, Facultad de Odontología, Universidad de la República, General Las Heras 1925, Montevideo, Uruguay.
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Hypoxia, acidification and oxidative stress in cells cultured at large distances from an oxygen source. Sci Rep 2022; 12:21699. [PMID: 36522457 PMCID: PMC9755289 DOI: 10.1038/s41598-022-26205-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022] Open
Abstract
Hypoxia is a condition frequently encountered by cells in tissues, whether as a normal feature of their microenvironment or subsequent to deregulated growth. Hypoxia can lead to acidification and increased oxidative stress, with profound consequences for cell physiology and tumorigenesis. Therefore, the interplay between hypoxia and oxidative stress is an important aspect for understanding the effects of hypoxic microenvironments on cells. We have used a previously developed variant of the method of coverslip-induced hypoxia to study the process of acidification in a hypoxic microenvironment and to simultaneously visualize intracellular levels of hypoxia and oxidative stress. We observed high accumulation of CO2 in hypoxic conditions, which we show is the main contributor to acidification in our model. Also, increased levels of oxidative stress were observed in moderately hypoxic cells close to the oxygen source, where the mitochondrial membrane potential was preserved. Conversely, cells at large distances from the oxygen source showed higher levels of hypoxia, milder oxidative stress and reduced mitochondrial membrane potential. Our results contribute to characterize the interplay between reduced oxygen levels, acidification and oxidative stress in a simple in vitro setting, which can be used to model cell responses to an altered environment, such as the early tumor microenvironment.
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Alonso JR, Silva A, Fernández A, Arocena M. Computational multifocus fluorescence microscopy for three-dimensional visualization of multicellular tumor spheroids. JOURNAL OF BIOMEDICAL OPTICS 2022; 27:JBO-210320SSR. [PMID: 35655357 PMCID: PMC9162503 DOI: 10.1117/1.jbo.27.6.066501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 05/23/2022] [Indexed: 05/27/2023]
Abstract
SIGNIFICANCE Three-dimensional (3D) visualization of multicellular tumor spheroids (MCTS) in fluorescence microscopy can rapidly provide qualitative morphological information about the architecture of these cellular aggregates, which can recapitulate key aspects of their in vivo counterpart. AIM The present work is aimed at overcoming the shallow depth-of-field (DoF) limitation in fluorescence microscopy while achieving 3D visualization of thick biological samples under study. APPROACH A custom-built fluorescence microscope with an electrically focus-tunable lens was developed to optically sweep in-depth the structure of MCTS. Acquired multifocus stacks were combined by means of postprocessing algorithms performed in the Fourier domain. RESULTS Images with relevant characteristics as extended DoF, stereoscopic pairs as well as reconstructed viewpoints of MCTS were obtained without segmentation of the focused regions or estimation of the depth map. The reconstructed images allowed us to observe the 3D morphology of cell aggregates. CONCLUSIONS Computational multifocus fluorescence microscopy can provide 3D visualization in MCTS. This tool is a promising development in assessing the morphological structure of different cellular aggregates while preserving a robust yet simple optical setup.
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Affiliation(s)
- Julia R. Alonso
- Universidad de la República, Instituto de Física, Facultad de Ingeniería, Montevideo, Uruguay
| | - Alejandro Silva
- Universidad de la República, Instituto de Física, Facultad de Ingeniería, Montevideo, Uruguay
| | - Ariel Fernández
- Universidad de la República, Instituto de Física, Facultad de Ingeniería, Montevideo, Uruguay
| | - Miguel Arocena
- Instituto de Investigaciones Biológicas Clemente Estable, Departamento de Genómica, Montevideo, Uruguay
- Universidad de la República, Cátedra de Bioquímica y Biofísica, Facultad de Odontología, Montevideo, Uruguay
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Huang CH, Chong KY, Lei KF. Analysis of the Internal Hypoxic Environment in Solid Tumor Tissue Using a Folding Paper System. ACS APPLIED MATERIALS & INTERFACES 2021; 13:33885-33893. [PMID: 34259499 DOI: 10.1021/acsami.1c08857] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Hypoxia is a nonphysiological oxygen tension which is common in most malignant tumors. Hypoxia stimulates complicated cell signaling networks in cancer cells, e.g., the HIF, PI3K, MAPK, and NFκB pathways. Then, cells release a number of cytokines such as VEGFA to promote the growth of peripheral blood vessels and lead to metastasis. In the current work, understanding of the internal hypoxic environment in solid tumor tissue was attempted by developing a folding paper system. A paper-based solid tumor was constructed by folding a filter paper cultured with cancer cells. The cellular response in each layer could be analyzed by disassembling the folded paper after the culture course. The result showed that an internal hypoxic environment was successfully reproduced in the paper-based solid tumor. The cells in the inner layer expressed high levels of HIF1-α and VEGFA. Hence, proliferation and migration of endothelial cells were shown to be induced by the cells located in the internal hypoxic environment. Moreover, the paper-based solid tumor was transplanted into nude mice for the study of hypoxic response and angiogenesis. The crosstalk between internal and external parts of solid tumor tissue could be analyzed by sectioning each layer of the paper-based solid tumor. This approach provides a favorable analytical method for the discovery of the interaction between cancer cells, hypoxia, and peripheral angiogenesis.
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Affiliation(s)
- Chia-Hao Huang
- Graduate Institute of Biomedical Engineering, Chang Gung University, Taoyuan 333, Taiwan
| | - Kowit-Yu Chong
- Department of Medical Biotechnology and Laboratory Science, and Graduate Institute of Biomedical Sciences, Division of Biotechnology, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
- Hyperbaric Oxygen Medical Research Lab, Bone and Joint Research Center, and Department of Laboratory Medicine, Chang Gung Memorial Hospital, Linkou 333, Taiwan
| | - Kin Fong Lei
- Graduate Institute of Biomedical Engineering, Chang Gung University, Taoyuan 333, Taiwan
- Department of Radiation Oncology, Chang Gung Memorial Hospital, Linkou 333, Taiwan
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