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Voss LJ, Steyn-Ross DA. Tissue oxygen partial pressure as a viability metric for ex vivo brain tissue slices. J Neurosci Methods 2023; 396:109932. [PMID: 37524246 DOI: 10.1016/j.jneumeth.2023.109932] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 06/19/2023] [Accepted: 07/28/2023] [Indexed: 08/02/2023]
Abstract
BACKGROUND Despite the prevalent use of the ex vivo brain slice preparation in neurophysiology research, a reliable method for judging tissue viability - and thus suitability of a slice for inclusion in an experiment - is lacking. The utility of indirect electrophysiological measures of tissue health is model-specific and needs to be used cautiously. In this study, we verify a more direct test of slice viability, based on tissue oxygen consumption rate. NEW METHOD We hypothesised that the minimum intra-slice partial pressure of oxygen (pO2min) would correlate with tissue oxygen consumption rate, providing an accessible method for reliably assessing tissue viability status. Using mouse brain cortex slices, we measured tissue oxygen consumption rate using a Fick's law diffusion-consumption model applied to full intra-tissue pO2 profiles and compared this to pO2min and 2,3,5-triphenol tetrazolium chloride (TTC) viability staining. RESULTS Tissue pO2min correlated strongly with oxygen consumption rate in both neurophysiological active and quiescent tissue (in "no-magnesium" and "normal" artificial cerebrospinal fluid, respectively) (R2 =49.7% and 42.1%, respectively). Both correlated with TTC viability stain. Oxygen consumption rate was positively related to the frequency of seizure-like event activity in no-magnesium artificial cerebrospinal fluid (R2 = 44.8%). COMPARISON WITH EXISTING METHODS While measurement of tissue oxygen levels and oxygen consumption is not new, intra-tissue pO2min is a novel approach to assess brain slice viability. CONCLUSION The results confirm that tissue oxygen minimum pO2min is a robust metric for estimating tissue viability status - the lower the pO2min, the healthier the tissue.
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Affiliation(s)
- Logan J Voss
- Department of Anaesthesia, Te Whatu Ora New Zealand, Waikato Hospital, Hamilton 3204, New Zealand.
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2
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Adams JC, Bell PD, Bodine SC, Brooks HL, Bunnett N, Joe B, Keehan KH, Kleyman TR, Marette A, Morty RE, Ramírez JM, Thomsen MB, Yates BJ, Zucker IH. An American Physiological Society cross-journal Call for Papers on "Deconstructing Organs: Single-Cell Analyses, Decellularized Organs, Organoids, and Organ-on-a-Chip Models". Am J Physiol Lung Cell Mol Physiol 2020; 319:L266-L272. [PMID: 32609556 PMCID: PMC7473938 DOI: 10.1152/ajplung.00311.2020] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Affiliation(s)
- Josephine C Adams
- School of Biochemistry, Faculty of Life Sciences, University of Bristol, Bristol, United Kingdom
| | - P Darwin Bell
- Division of Nephrology, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
| | - Sue C Bodine
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa
| | - Heddwen L Brooks
- Department of Physiology, University of Arizona College of Medicine, Tucson, Arizona
| | - Nigel Bunnett
- Department of Molecular Pathobiology, New York University, New York, New York
| | - Bina Joe
- Department of Physiology and Pharmacology, University of Toledo College of Medicine and Life Sciences, Toledo, Ohio.,Center for Hypertension and Personalized Medicine, University of Toledo College of Medicine and Life Sciences, Toledo, Ohio
| | | | - Thomas R Kleyman
- Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania.,Department of Cell Biology, University of Pittsburgh, Pittsburgh, Pennsylvania.,Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - André Marette
- Department of Medicine, Faculty of Medicine, Cardiology Axis of the Québec Heart and Lung Institute, Hôpital Laval, Quebec City, Quebec, Canada.,Institute of Nutrition and Functional Foods, Laval University, Quebec City, Quebec, Canada
| | - Rory E Morty
- Department of Lung Development and Remodelling, Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany.,Department of Internal Medicine (Pulmonology), University of Giessen and Marburg Lung Center, Justus Liebig University Giessen, member of the German Center for Lung Research (DZL), Giessen, Germany
| | - Jan-Marino Ramírez
- Department of Neurological Surgery, University of Washington Medical Center, Seattle, Washington.,Center on Human Development and Disability, University of Washington, Seattle, Washington.,Center for Integrative Brain Research, Seattle Children's Research Institute, University of Washington, Seattle, Washington
| | - Morten B Thomsen
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Bill J Yates
- Department of Otolaryngology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Irving H Zucker
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
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Gill EL, Koelmel JP, Yost RA, Okun MS, Vedam-Mai V, Garrett TJ. Mass Spectrometric Methodologies for Investigating the Metabolic Signatures of Parkinson’s Disease: Current Progress and Future Perspectives. Anal Chem 2018; 90:2979-2986. [DOI: 10.1021/acs.analchem.7b04084] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Emily L. Gill
- Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Jeremy P. Koelmel
- Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Richard A. Yost
- Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
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Gill EL, Marks M, Yost RA, Vedam-Mai V, Garrett TJ. Monitoring Dopamine ex Vivo during Electrical Stimulation Using Liquid-Microjunction Surface Sampling. Anal Chem 2017; 89:13658-13665. [DOI: 10.1021/acs.analchem.7b04463] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Emily L. Gill
- Department of Chemistry, ‡Department of Neurosurgery, and §Department of
Pathology, Immunology
and Laboratory Medicine, University of Florida, Gainesville, Florida 32611, United States
| | - Megan Marks
- Department of Chemistry, ‡Department of Neurosurgery, and §Department of
Pathology, Immunology
and Laboratory Medicine, University of Florida, Gainesville, Florida 32611, United States
| | - Richard A. Yost
- Department of Chemistry, ‡Department of Neurosurgery, and §Department of
Pathology, Immunology
and Laboratory Medicine, University of Florida, Gainesville, Florida 32611, United States
| | - Vinata Vedam-Mai
- Department of Chemistry, ‡Department of Neurosurgery, and §Department of
Pathology, Immunology
and Laboratory Medicine, University of Florida, Gainesville, Florida 32611, United States
| | - Timothy J. Garrett
- Department of Chemistry, ‡Department of Neurosurgery, and §Department of
Pathology, Immunology
and Laboratory Medicine, University of Florida, Gainesville, Florida 32611, United States
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Dorris DM, Hauser CA, Minnehan CE, Meitzen J. An aerator for brain slice experiments in individual cell culture plate wells. J Neurosci Methods 2014; 238:1-10. [PMID: 25256645 DOI: 10.1016/j.jneumeth.2014.09.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Revised: 09/12/2014] [Accepted: 09/15/2014] [Indexed: 11/29/2022]
Abstract
BACKGROUND Ex vivo acute living brain slices are a broadly employed and powerful experimental preparation. Most new technology regarding this tissue has involved the chamber used when performing electrophysiological experiments. Alternatively we instead focus on the creation of a simple, versatile aerator designed to allow maintenance and manipulation of acute brain slices and potentially other tissue in a multi-well cell culture plate. NEW METHOD Here we present an easily manufactured aerator designed to fit into a 24-well cell culture plate. It features a nylon mesh and a single microhole to enable gas delivery without compromising tissue stability. The aerator is designed to be individually controlled, allowing both high throughput and single well experiments. RESULTS The aerator was validated by testing material leach, dissolved oxygen delivery, brain slice viability and neuronal electrophysiology. Example experiments are also presented, including a test of whether β1-adrenergic receptor activation regulates gene expression in ex vivo dorsal striatum using qPCR. COMPARISON WITH EXISTING METHODS Key differences include enhanced control over gas delivery to individual wells containing brain slices, decreased necessary volume, a sample restraint to reduce movement artifacts, the potential to be sterilized, the avoidance of materials that absorb water and small biological molecules, minimal production costs, and increased experimental throughput. CONCLUSION This new aerator is of high utility and will be useful for experiments involving brain slices and other potentially tissue samples in 24-well cell culture plates.
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Affiliation(s)
- David M Dorris
- Department of Biological Sciences, North Carolina State University, Raleigh, NC, USA
| | - Caitlin A Hauser
- Department of Biological Sciences, North Carolina State University, Raleigh, NC, USA
| | - Caitlin E Minnehan
- Department of Biological Sciences, North Carolina State University, Raleigh, NC, USA
| | - John Meitzen
- Department of Biological Sciences, North Carolina State University, Raleigh, NC, USA; W.M. Keck Center for Behavioral Biology, Center for Human Health and the Environment, and Center for Comparative Medicine and Translational Research, North Carolina State University, Raleigh, NC, USA.
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