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Schwehr BJ, Hartnell D, Ellison G, Hindes MT, Milford B, Dallerba E, Hickey SM, Pfeffer FM, Brooks DA, Massi M, Hackett MJ. Fluorescent probes for neuroscience: imaging ex vivo brain tissue sections. Analyst 2024. [PMID: 39171617 DOI: 10.1039/d4an00663a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2024]
Abstract
Neurobiological research relies heavily on imaging techniques, such as fluorescence microscopy, to understand neurological function and disease processes. However, the number and variety of fluorescent probes available for ex vivo tissue section imaging limits the advance of research in the field. In this review, we outline the current range of fluorescent probes that are available to researchers for ex vivo brain section imaging, including their physical and chemical characteristics, staining targets, and examples of discoveries for which they have been used. This review is organised into sections based on the biological target of the probe, including subcellular organelles, chemical species (e.g., labile metal ions), and pathological phenomenon (e.g., degenerating cells, aggregated proteins). We hope to inspire further development in this field, given the considerable benefits to be gained by the greater availability of suitably sensitive probes that have specificity for important brain tissue targets.
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Affiliation(s)
- Bradley J Schwehr
- Curtin University, School of Molecular and Life Sciences, Perth, WA, Australia 6845.
| | - David Hartnell
- Curtin University, School of Molecular and Life Sciences, Perth, WA, Australia 6845.
- Curtin University, Curtin Health Innovation Research Institute, Perth, WA, Australia 6102
| | - Gaewyn Ellison
- Curtin University, School of Molecular and Life Sciences, Perth, WA, Australia 6845.
- Curtin University, Curtin Health Innovation Research Institute, Perth, WA, Australia 6102
| | - Madison T Hindes
- Clinical and Health Sciences, University of South Australia, Adelaide, South Australia 5000
| | - Breah Milford
- Curtin University, School of Molecular and Life Sciences, Perth, WA, Australia 6845.
| | - Elena Dallerba
- Curtin University, School of Molecular and Life Sciences, Perth, WA, Australia 6845.
| | - Shane M Hickey
- Clinical and Health Sciences, University of South Australia, Adelaide, South Australia 5000
| | - Frederick M Pfeffer
- School of Life and Environmental Sciences, Deakin University, Waurn Ponds, Victoria, 3216, Australia
| | - Doug A Brooks
- Clinical and Health Sciences, University of South Australia, Adelaide, South Australia 5000
| | - Massimiliano Massi
- Curtin University, School of Molecular and Life Sciences, Perth, WA, Australia 6845.
| | - Mark J Hackett
- Curtin University, School of Molecular and Life Sciences, Perth, WA, Australia 6845.
- Curtin University, Curtin Health Innovation Research Institute, Perth, WA, Australia 6102
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2
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Hackett MJ. A commentary on studies of brain iron accumulation during ageing. J Biol Inorg Chem 2024; 29:385-394. [PMID: 38735007 PMCID: PMC11186910 DOI: 10.1007/s00775-024-02060-2] [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: 12/04/2023] [Accepted: 04/29/2024] [Indexed: 05/13/2024]
Abstract
Brain iron content is widely reported to increase during "ageing", across multiple species from nematodes, rodents (mice and rats) and humans. Given the redox-active properties of iron, there has been a large research focus on iron-mediated oxidative stress as a contributor to tissue damage during natural ageing, and also as a risk factor for neurodegenerative disease. Surprisingly, however, the majority of published studies have not investigated brain iron homeostasis during the biological time period of senescence, and thus knowledge of how brain homeostasis changes during this critical stage of life largely remains unknown. This commentary examines the literature published on the topic of brain iron homeostasis during ageing, providing a critique on limitations of currently used experimental designs. The commentary also aims to highlight that although much research attention has been given to iron accumulation or iron overload as a pathological feature of ageing, there is evidence to support functional iron deficiency may exist, and this should not be overlooked in studies of ageing or neurodegenerative disease.
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Affiliation(s)
- Mark J Hackett
- School of Molecular and Life Sciences, Curtin University, Perth, WA, 6845, Australia.
- Curtin Health Innovation Research Institute, Curtin University, Perth, WA, 6102, Australia.
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3
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Huzayyin AAS, Ibrahim MK, Hassanein NMA, Ahmed HMS. Vitamin D3 and zinc supplements augment the antimanic efficacy of lithium and olanzapine treatments in an animal model of mania. Nutr Neurosci 2024:1-14. [PMID: 38635860 DOI: 10.1080/1028415x.2024.2338344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2024]
Abstract
Objective: Bipolar disorder (BD) is a challenging psychiatric disorder and a complex disease. The associated reduction in serum vitamin D3 (VitD3) levels in BD patients and the contribution of zinc (Zn) to the treatment, along with the severe side effects of lithium (Li) treatment, were encouraging to assess the efficacy of different correlated combinations of therapeutic/nutraceutical treatments such as olanzapine (Oln), VitD3, and Zn against Li. Methods: Mania was induced in C57BL/6 mice by administering methylphenidate (MPH) for 14 consecutive days. On the 8th day of MPH injection, different treatment regimens were administered, Li, Oln, VitD3/Zn, VitD3/Zn/Oln, VitD3 + Zn + Oln + Li50mg/kg (C50), and VitD3 + Zn + Oln + Li100mg/kg (C100). Both VitD3 (850 IU/kg) and Zn (180 mg/kg) were supplied with food for 2 weeks before starting the induction of mania, which continued until the end of MPH administration. Behavioral, brain oxidative stress, thyroid hormones, VitD3, Zn, GsK-3β, and Bcl2 levels, as well as brain histopathological alterations, were assessed. Results: Manic mice exhibited alterations in all tested parameters, and the histopathological examination of the cortex and hippocampus confirmed these results. The VitD3/Zn/Oln, C50, and C100 treatment regimens reversed most of the behavioral and pathophysiological alterations; however, the C50 treatment regimen was the most efficient. Conclusions: This study emphasizes the importance of combining different antimanic medications like Li and Oln with nutraceutical supplements to increase their antimanic efficacy, reduce their adverse effects, and, ideally, improve the BD patient's quality of life.
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Affiliation(s)
- Aya A S Huzayyin
- Central Administration of Drug Control, Egyptian Drug Authority (EDA), Giza, Egypt
| | - Michael K Ibrahim
- Central Administration of Biological and Innovative Products and Clinical Studies, Egyptian Drug Authority (EDA), Giza, Egypt
| | - Nahed M A Hassanein
- Developmental Pharmacology and Acute Toxicity Department, National Organization for Drug Control and Research (NODCAR), Giza, Egypt
| | - Helmy M S Ahmed
- Department of Pharmacology and Toxicology, Faculty of Pharmacy-Cairo University, Cairo, Egypt
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Evans CW, Egid A, Mamsa SSA, Paterson DJ, Ho D, Bartlett CA, Fehily B, Lins BR, Fitzgerald M, Hackett MJ, Smith NM. Elemental Mapping in a Preclinical Animal Model Reveals White Matter Copper Elevation in the Acute Phase of Central Nervous System Trauma. ACS Chem Neurosci 2023; 14:3518-3527. [PMID: 37695072 DOI: 10.1021/acschemneuro.3c00421] [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] [Indexed: 09/12/2023] Open
Abstract
Understanding the chemical events following trauma to the central nervous system could assist in identifying causative mechanisms and potential interventions to protect neural tissue. Here, we apply a partial optic nerve transection model of injury in rats and use synchrotron X-ray fluorescence microscopy (XFM) to perform elemental mapping of metals (K, Ca, Fe, Cu, Zn) and other related elements (P, S, Cl) in white matter tracts. The partial optic nerve injury model and spatial precision of microscopy allow us to obtain previously unattained resolution in mapping elemental changes in response to a primary injury and subsequent secondary effects. We observed significant elevation of Cu levels at multiple time points following the injury, both at the primary injury site and in neural tissue near the injury site vulnerable to secondary damage, as well as significant changes in Cl, K, P, S, and Ca. Our results suggest widespread metal dyshomeostasis in response to central nervous system trauma and that altered Cu homeostasis may be a specific secondary event in response to white matter injury. The findings highlight metal homeostasis as a potential point of intervention in limiting damage following nervous system injury.
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Affiliation(s)
- Cameron W Evans
- School of Molecular Sciences, The University of Western Australia, Crawley, WA 6009, Australia
| | - Abigail Egid
- School of Molecular Sciences, The University of Western Australia, Crawley, WA 6009, Australia
- University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
| | - Somayra S A Mamsa
- School of Molecular Sciences, The University of Western Australia, Crawley, WA 6009, Australia
| | | | - Diwei Ho
- School of Molecular Sciences, The University of Western Australia, Crawley, WA 6009, Australia
| | - Carole A Bartlett
- Curtin Health and Innovation Research Institute, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Brooke Fehily
- Curtin Health and Innovation Research Institute, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
- Perron Institute for Neurological and Translational Sciences, 8 Verdun Street, Nedlands, WA 6009, Australia
| | - Brittney R Lins
- Curtin Health and Innovation Research Institute, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
- Perron Institute for Neurological and Translational Sciences, 8 Verdun Street, Nedlands, WA 6009, Australia
| | - Melinda Fitzgerald
- Curtin Health and Innovation Research Institute, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
- Perron Institute for Neurological and Translational Sciences, 8 Verdun Street, Nedlands, WA 6009, Australia
| | - Mark J Hackett
- Curtin Health and Innovation Research Institute, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
- School of Molecular and Life Sciences, Faculty of Science and Engineering, Curtin University, Bentley, WA 6102, Australia
| | - Nicole M Smith
- School of Molecular Sciences, The University of Western Australia, Crawley, WA 6009, Australia
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5
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Juan SMA, Daglas M, Gunn AP, Lago L, Adlard PA. Characterization of the spatial distribution of metals and profile of metalloprotein complexes in a mouse model of repetitive mild traumatic brain injury. METALLOMICS : INTEGRATED BIOMETAL SCIENCE 2022; 14:6865363. [PMID: 36460052 DOI: 10.1093/mtomcs/mfac092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 12/01/2022] [Indexed: 12/04/2022]
Abstract
Metal dyshomeostasis is a well-established consequence of neurodegenerative diseases and traumatic brain injury. While the significance of metals continues to be uncovered in many neurological disorders, their implication in repetitive mild traumatic brain injury remains uncharted. To address this gap, we characterized the spatial distribution of metal levels (iron, zinc, and copper) using laser ablation-inductively coupled plasma-mass spectrometry, the profile of metal-binding proteins via size exclusion chromatography-inductively coupled plasma-mass spectrometry and the expression of the major iron storing protein ferritin via western blotting. Using a mouse model of repetitive mild traumatic brain injury, 3-month-old male and female C57Bl6 mice received one or five impacts (48 h apart). At 1 month following 5× TBI (traumatic brain injury), iron and ferritin levels were significantly elevated in the contralateral cortex. There was a trend toward increased iron levels in the entire contralateral hemisphere and a reduction in contralateral cortical iron-binding proteins following 1× TBI. No major changes in zinc levels were seen in both hemispheres following 5× or 1× TBI, although there was a reduction in ipsilateral zinc-binding proteins following 5× TBI and a contralateral increase in zinc-binding proteins following 1× TBI. Copper levels were significantly increased in both hemispheres following 5× TBI, without changes in copper-binding proteins. This study shows for the first time that repetitive mild TBI (r-mTBI) leads to metal dyshomeostasis, highlighting its potential involvement in promoting neurodegeneration, which provides a rationale for examining the benefit of metal-targeting drugs, which have shown promising results in neurodegenerative conditions and single TBI, but have yet to be tested following r-mTBI.
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Affiliation(s)
- Sydney M A Juan
- Synaptic Neurobiology Laboratory, The Florey Institute of Neuroscience and Mental Health, The Melbourne Dementia Research Centre and The University of Melbourne, Melbourne, Australia
| | - Maria Daglas
- Synaptic Neurobiology Laboratory, The Florey Institute of Neuroscience and Mental Health, The Melbourne Dementia Research Centre and The University of Melbourne, Melbourne, Australia
| | - Adam P Gunn
- Neuropathology Laboratory, The Florey Institute of Neuroscience and Mental Health, Parkville, Australia
| | - Larissa Lago
- Synaptic Neurobiology Laboratory, The Florey Institute of Neuroscience and Mental Health, The Melbourne Dementia Research Centre and The University of Melbourne, Melbourne, Australia
| | - Paul A Adlard
- Synaptic Neurobiology Laboratory, The Florey Institute of Neuroscience and Mental Health, The Melbourne Dementia Research Centre and The University of Melbourne, Melbourne, Australia
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6
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Ellison G, Hollings AL, Hackett MJ. A review of the “metallome” within neurons and glia, as revealed by elemental mapping of brain tissue. BBA ADVANCES 2022; 2:100038. [PMID: 37082604 PMCID: PMC10074908 DOI: 10.1016/j.bbadva.2021.100038] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 12/16/2021] [Accepted: 12/17/2021] [Indexed: 01/01/2023] Open
Abstract
It is now well established that transition metals, such as Iron (Fe), Copper (Cu), and Zinc (Zn) are necessary for healthy brain function. Although Fe, Cu, and Zn are essential to the brain, imbalances in the amount, distribution, or chemical form ("metallome") of these metals is linked to the pathology of numerous brain diseases or disorders. Despite the known importance of metal ions for both brain health and disease, the metallome that exists within specific types of brain cells is yet to be fully characterised. The aim of this mini-review is to present an overview of the current knowledge of the metallome found within specific brain cells (oligodendrocytes, astrocytes, microglia, and neurons), as revealed by direct elemental mapping techniques. It is hoped this review will foster continued research using direct elemental mapping techniques to fully characterise the brain cell metallome.
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Affiliation(s)
- Gaewyn Ellison
- School of Molecular and Life Sciences, Curtin University, Perth, WA 6845, Australia
- Curtin Health Innovation Research Institute, Curtin University, Perth, WA 6102, Australia
| | - Ashley L. Hollings
- School of Molecular and Life Sciences, Curtin University, Perth, WA 6845, Australia
- Curtin Health Innovation Research Institute, Curtin University, Perth, WA 6102, Australia
| | - Mark J. Hackett
- School of Molecular and Life Sciences, Curtin University, Perth, WA 6845, Australia
- Curtin Health Innovation Research Institute, Curtin University, Perth, WA 6102, Australia
- Corresponding author.
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7
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Hackett MJ, Hollings AL, Lam V, Takechi R, Mamo JCL, de Jonge MD, Paterson D, Okuyama S. [Mapping the Metallo-maze to Memory Loss: Does Neuronal Metal Ion Deficiency Contribute to Dementia?]. YAKUGAKU ZASSHI 2021; 141:835-842. [PMID: 34078791 DOI: 10.1248/yakushi.20-00251-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Dementia has no cure and is an international health crisis. In addition to the immeasurable loss of QOL caused by dementia, the global economic cost is predicted to reach $2 trillion (USD) by 2030. Although much remains unknown about the biochemical pathways driving cognitive decline and memory loss during dementia, metals have been implicated in neurodegenerative disease. For example, total levels of Fe and Cu increase, which has been proposed to drive oxidative stress; and Fe, Cu, and Zn can bind amyloid-β, catalysing aggregation and formation of amyloid plaques. Unfortunately, despite these known facets through which metal ions may induce pathology, studies in greater detail have been hampered by a lack of microscopy methods to directly visualise metal ions, and their chemical form, within brain cells. Herein we report the use of synchrotron X-ray fluorescence microscopy to simultaneously image Fe, Cu, and Zn within neurons in ex vivo brain tissue sections. Using animal models of dementia, we now demonstrate for the first time that despite global increases in brain metal content and metal ion accumulation within amyloid plaques, key brain regions may also become metal ion deficient. Such deficiency could contribute to cognitive decline because of the essential roles metal ions play in neurotransmitter synthesis and energy metabolism. These recent findings are discussed in the context of memory loss, and the impact that metal ion dis-homeostasis may have on diagnostic and therapeutic development.
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Affiliation(s)
- Mark J Hackett
- School of Molecular and Life Sciences, Curtin University.,Curtin Health Innovation Research Institute, Curtin University.,Curtin Institute of Functional Molecules and Interfaces, Curtin University
| | - Ashley L Hollings
- School of Molecular and Life Sciences, Curtin University.,Curtin Health Innovation Research Institute, Curtin University.,Curtin Institute of Functional Molecules and Interfaces, Curtin University
| | - Virginie Lam
- Curtin Health Innovation Research Institute, Curtin University
| | - Ryusuke Takechi
- Curtin Health Innovation Research Institute, Curtin University
| | - John C L Mamo
- Curtin Health Innovation Research Institute, Curtin University
| | | | | | - Satoshi Okuyama
- Department of Pharmaceutical Pharmacology, College of Pharmaceutical Sciences, Matsuyama University
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8
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Fluoxetine exerts subregion/layer specific effects on parvalbumin/GAD67 protein expression in the dorsal hippocampus of male rats showing social isolation-induced depressive-like behaviour. Brain Res Bull 2021; 173:174-183. [PMID: 34048829 DOI: 10.1016/j.brainresbull.2021.05.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Revised: 04/29/2021] [Accepted: 05/23/2021] [Indexed: 11/21/2022]
Abstract
The molecular background of depression is intensively studied in terms of alterations of inhibitory circuits, mediated by gamma aminobutyric acid (GABA) signalization. We investigated the effects of chronic social isolation (CSIS) and chronic fluoxetine (Flx) treatment (15 mg/kg/day) (3 weeks), on Parvalbumin (PV) and GAD67 expression in a layer-specific manner in rat dorsal hippocampal subregions. CSIS-induced depressive- and anxiety-like behaviours were confirmed with decrease in sucrose preference and increase in marble burying during behavioural testing, while Flx antagonized these effects. CSIS altered PV expression in stratum pyramidale (SP) of dorsal cornu ammonis 1 (dCA1) and stratum radiatum (SR) of dCA3. Flx antagonized this effect, and boosted PV expression in SP of the entire dCA and the dorsal dentate gyrus (dDG), as well as in the SR of dCA1/CA3. CSIS showed no significant effects on GAD67 expression, while Flx boosted its expression within the SR of the entire CA and SO of the dCA3. A correlation between SP of dCA1 and SR of dCA3 with regard to PV changes, implicates their possible role in the inhibitory circuit alterations. Flx-induced increase in GAD67 expression, specifically in SR of the entire dHIPP, may impose its involvement in the cell metabolic processes. Strong negative correlation between GAD67 and sucrose preference following Flx-treatment of CSIS rats was revealed. PV + cells of the SP layer of dCA1 and CA2 could be a potential target for the antidepressant action of Flx, while strong effect of Flx on GAD67 expression in the SR should be more extensively studied.
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9
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Petrus E, Saar G, Daoust A, Dodd S, Koretsky AP. A hierarchy of manganese competition and entry in organotypic hippocampal slice cultures. NMR IN BIOMEDICINE 2021; 34:e4476. [PMID: 33538073 PMCID: PMC7988546 DOI: 10.1002/nbm.4476] [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] [Received: 09/04/2020] [Accepted: 01/02/2021] [Indexed: 05/15/2023]
Abstract
Contrast agents improve clinical and basic research MRI. The manganese ion (Mn2+ ) is an essential, endogenous metal found in cells and it enhances MRI contrast because of its paramagnetic properties. Manganese-enhanced MRI (MEMRI) has been widely used to image healthy and diseased states of the body and the brain in a variety of animal models. There has also been some work in translating the useful properties of MEMRI to humans. Mn2+ accumulates in brain regions with high neural activity and enters cells via voltage-dependent channels that flux calcium (Ca2+ ). In addition, metal transporters for zinc (Zn2+ ) and iron (Fe2+ ) can also transport Mn2+ . There is also transfer through channels specific for Mn2+ . Although Mn2+ accumulates in many tissues including brain, the mechanisms and preferences of its mode of entry into cells are not well characterized. The current study used MRI on living organotypic hippocampal slice cultures to detect which transport mechanisms are preferentially used by Mn2+ to enter cells. The use of slice culture overcomes the presence of the blood brain barrier, which limits inferences made with studies of the intact brain in vivo. A range of Mn2+ concentrations were used and their effects on neural activity were assessed to avoid using interfering doses of Mn2+ . Zn2+ and Fe2+ were the most efficient competitors for Mn2+ uptake into the cultured slices, while the presence of Ca2+ or Ca2+ channel antagonists had a more moderate effect. Reducing slice activity via excitatory receptor antagonists was also effective at lowering Mn2+ uptake. In conclusion, a hierarchy of those agents which influence Mn2+ uptake was established to enhance understanding of how Mn2+ enters cells in a cultured slice preparation.
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Affiliation(s)
- Emily Petrus
- Laboratory of Functional and Molecular ImagingNational Institute of Neurological Disorders and Stroke, National Institutes of HealthBethesdaMarylandUSA
| | - Galit Saar
- Laboratory of Functional and Molecular ImagingNational Institute of Neurological Disorders and Stroke, National Institutes of HealthBethesdaMarylandUSA
| | - Alexia Daoust
- Laboratory of Functional and Molecular ImagingNational Institute of Neurological Disorders and Stroke, National Institutes of HealthBethesdaMarylandUSA
| | - Steve Dodd
- Laboratory of Functional and Molecular ImagingNational Institute of Neurological Disorders and Stroke, National Institutes of HealthBethesdaMarylandUSA
| | - Alan P. Koretsky
- Laboratory of Functional and Molecular ImagingNational Institute of Neurological Disorders and Stroke, National Institutes of HealthBethesdaMarylandUSA
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10
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Hollings AL, Lam V, Takechi R, Mamo JCL, Reinhardt J, de Jonge MD, Kappen P, Hackett MJ. Revealing differences in the chemical form of zinc in brain tissue using K-edge X-ray absorption near-edge structure spectroscopy. Metallomics 2020; 12:2134-2144. [PMID: 33300524 DOI: 10.1039/d0mt00198h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Zinc is a prominent trace metal required for normal memory function. Memory loss and cognitive decline during natural ageing and neurodegenerative disease have been associated with altered brain-Zn homeostasis. Yet, the exact chemical pathways through which Zn influences memory function during health, natural ageing, or neurodegenerative disease remain unknown. The gap in the literature may in part be due to the difficulty to simultaneously image, and therefore, study the different chemical forms of Zn within the brain (or biological samples in general). To this extent, we have begun developing and optimising protocols that incorporate X-ray absorption near-edge structure (XANES) spectroscopic analysis of tissue at the Zn K-edge as an analytical tool to study Zn speciation in the brain. XANES is ideally suited for this task as all chemical forms of Zn are detected, the technique requires minimal sample preparation that may otherwise redistribute or alter the chemical form of Zn, and the Zn K-edge has known sensitivity to coordination geometry and ligand type. Herein, we report our initial results where we fit K-edge spectra collected from micro-dissected flash-frozen brain tissue, to a spectral library prepared from standard solutions, to demonstrate differences in the chemical form of Zn that exist between two brain regions, the hippocampus and cerebellum. Lastly, we have used an X-ray microprobe to demonstrate differences in Zn speciation within sub-regions of thin air-dried sections of the murine hippocampus; but, the corresponding results highlight that the chemical form of Zn is easily perturbed by sample preparation such as tissue sectioning or air-drying, which must be a critical consideration for future work.
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Affiliation(s)
- Ashley L Hollings
- Curtin Health Innovation Research Institute, Curtin University, Perth, WA 6102, Australia.
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11
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Pushie M, Hollings A, Reinhardt J, Webb S, Lam V, Takechi R, Mamo J, Paterson P, Kelly M, George G, Pickering I, Hackett M. Sample preparation with sucrose cryoprotection dramatically alters Zn distribution in the rodent hippocampus, as revealed by elemental mapping. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY 2020; 35:2498-2508. [PMID: 33795908 PMCID: PMC8009441 DOI: 10.1039/d0ja00323a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Transition metal ions (Fe, Mn, Cu, Zn) are essential for healthy brain function, but altered concentration, distribution, or chemical form of the metal ions has been implicated in numerous brain pathologies. Currently, it is not possible to image the cellular or sub-cellular distribution of metal ions in vivo and therefore, studying brain-metal homeostasis largely relies on ex vivo in situ elemental mapping. Sample preparation methods that accurately preserve the in vivo elemental distribution are essential if one wishes to translate the knowledge of elemental distributions measured ex vivo toward increased understanding of chemical and physiological pathways of brain disease. The choice of sample preparation is particularly important for metal ions that exist in a labile or mobile form, for which the in vivo distribution could be easily distorted by inappropriate sample preparation. One of the most widely studied brain structures, the hippocampus, contains a large pool of labile and mobile Zn. Herein, we describe how sucrose cryoprotection, the gold standard method of preparing tissues for immuno-histochemistry or immuno-fluorescence, which is also often used as a sample preparation method for elemental mapping studies, drastically alters hippocampal Zn distribution. Based on the results of this study, in combination with a comparison against the strong body of published literature that has used either rapid plunge freezing of brain tissue, or sucrose cryo-protection, we strongly urge investigators in the future to cease using sucrose cryoprotection as a method of sample preparation for elemental mapping, especially if Zn is an analyte of interest.
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Affiliation(s)
- M.J. Pushie
- Department of Surgery, Division of Neurosurgery, College of Medicine, University of Saskatchewan, 107 Wiggins Road, Saskatoon, Saskatchewan S7N 5E5, Canada
| | - A. Hollings
- Curtin Health Innovation Research Institute, Curtin University, Perth, WA 6102, AUS
- School of Molecular and Life Sciences, Curtin University, Perth, WA 6845, AUS
| | - J. Reinhardt
- Australian Nuclear Science and Technology Organisation, 800 Blackburn Road, Clayton, VIC, AUS 3168
| | - S.M. Webb
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California, USA 94025
| | - V. Lam
- Curtin Health Innovation Research Institute, Curtin University, Perth, WA 6102, AUS
- School of Public Health, Faculty of Health Sciences, Curtin University, WA, Australia
| | - R Takechi
- Curtin Health Innovation Research Institute, Curtin University, Perth, WA 6102, AUS
- School of Public Health, Faculty of Health Sciences, Curtin University, WA, Australia
| | - J.C. Mamo
- Curtin Health Innovation Research Institute, Curtin University, Perth, WA 6102, AUS
- School of Public Health, Faculty of Health Sciences, Curtin University, WA, Australia
| | - P.G. Paterson
- College of Pharmacy and Nutrition, University of Saskatchewan, 107 Wiggins Rd, Saskatoon, Saskatchewan, S7N 5E5, Canada
| | - M.E. Kelly
- Department of Surgery, Division of Neurosurgery, College of Medicine, University of Saskatchewan, 107 Wiggins Road, Saskatoon, Saskatchewan S7N 5E5, Canada
| | - G.N. George
- School Molecular and Environmental Sciences Group, Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
| | - I.J. Pickering
- School Molecular and Environmental Sciences Group, Geological Sciences, University of Saskatchewan, 114 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
| | - M.J. Hackett
- Curtin Health Innovation Research Institute, Curtin University, Perth, WA 6102, AUS
- School of Molecular and Life Sciences, Curtin University, Perth, WA 6845, AUS
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12
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Nano-imaging trace elements at organelle levels in substantia nigra overexpressing α-synuclein to model Parkinson's disease. Commun Biol 2020; 3:364. [PMID: 32647232 PMCID: PMC7347932 DOI: 10.1038/s42003-020-1084-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Accepted: 06/18/2020] [Indexed: 12/17/2022] Open
Abstract
Sub-cellular trace element quantifications of nano-heterogeneities in brain tissues offer unprecedented ways to explore at elemental level the interplay between cellular compartments in neurodegenerative pathologies. We designed a quasi-correlative method for analytical nanoimaging of the substantia nigra, based on transmission electron microscopy and synchrotron X-ray fluorescence. It combines ultrastructural identifications of cellular compartments and trace element nanoimaging near detection limits, for increased signal-to-noise ratios. Elemental composition of different organelles is compared to cytoplasmic and nuclear compartments in dopaminergic neurons of rat substantia nigra. They exhibit 150–460 ppm of Fe, with P/Zn/Fe-rich nucleoli in a P/S-depleted nuclear matrix and Ca-rich rough endoplasmic reticula. Cytoplasm analysis displays sub-micron Fe/S-rich granules, including lipofuscin. Following AAV-mediated overexpression of α-synuclein protein associated with Parkinson’s disease, these granules shift towards higher Fe concentrations. This effect advocates for metal (Fe) dyshomeostasis in discrete cytoplasmic regions, illustrating the use of this method to explore neuronal dysfunction in brain diseases. Lemelle et al. describe the use of TEM and synchrotron X-ray fluorescence for quasi-correlative nanoimaging and sub-cellular trace element quantification of rat brain tissue. They further observe elemental (iron and sulfur) dyshomeostasis in cytoplasmic granules when overexpressing α-synuclein protein associated with Parkinson’s disease, demonstrating the usefulness of this method to further explore dysfunctions at organelle levels in brain diseases.
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Jones MWM, Kopittke PM, Casey L, Reinhardt J, Blamey FPC, van der Ent A. Assessing radiation dose limits for X-ray fluorescence microscopy analysis of plant specimens. ANNALS OF BOTANY 2020; 125:599-610. [PMID: 31777920 PMCID: PMC7102987 DOI: 10.1093/aob/mcz195] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 11/27/2019] [Indexed: 05/05/2023]
Abstract
BACKGROUND AND AIMS X-ray fluorescence microscopy (XFM) is a powerful technique to elucidate the distribution of elements within plants. However, accumulated radiation exposure during analysis can lead to structural damage and experimental artefacts including elemental redistribution. To date, acceptable dose limits have not been systematically established for hydrated plant specimens. METHODS Here we systematically explore acceptable dose rate limits for investigating fresh sunflower (Helianthus annuus) leaf and root samples and investigate the time-dose damage in leaves attached to live plants. KEY RESULTS We find that dose limits in fresh roots and leaves are comparatively low (4.1 kGy), based on localized disintegration of structures and element-specific redistribution. In contrast, frozen-hydrated samples did not incur any apparent damage even at doses as high as 587 kGy. Furthermore, we find that for living plants subjected to XFM measurement in vivo and grown for a further 9 d before being reimaged with XFM, the leaves display elemental redistribution at doses as low as 0.9 kGy and they continue to develop bleaching and necrosis in the days after exposure. CONCLUSIONS The suggested radiation dose limits for studies using XFM to examine plants are important for the increasing number of plant scientists undertaking multidimensional measurements such as tomography and repeated imaging using XFM.
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Affiliation(s)
- Michael W M Jones
- Central Analytical Research Facility, Institute for Future Environments, Queensland University of Technology, Australia
- For correspondence. E-mail
| | - Peter M Kopittke
- School of Agriculture and Food Sciences, The University of Queensland, Australia
| | - Lachlan Casey
- Centre for Microscopy and Microanalysis, The University of Queensland, Australia
| | | | - F Pax C Blamey
- School of Agriculture and Food Sciences, The University of Queensland, Australia
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Subcellular Chemical Imaging: New Avenues in Cell Biology. Trends Cell Biol 2020; 30:173-188. [DOI: 10.1016/j.tcb.2019.12.007] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 12/10/2019] [Accepted: 12/17/2019] [Indexed: 12/31/2022]
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Hartnell D, Gillespie-Jones K, Ciornei C, Hollings A, Thomas A, Harrild E, Reinhardt J, Paterson DJ, Alwis D, Rajan R, Hackett MJ. Characterization of Ionic and Lipid Gradients within Corpus Callosum White Matter after Diffuse Traumatic Brain Injury in the Rat. ACS Chem Neurosci 2020; 11:248-257. [PMID: 31850738 DOI: 10.1021/acschemneuro.9b00257] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
There is increased recognition of the effects of diffuse traumatic brain injury (dTBI), which can initiate yet unknown biochemical cascades, resulting in delayed secondary brain degeneration and long-term neurological sequela. There is limited availability of therapies that minimize the effect of secondary brain damage on the quality of life of people who have suffered TBI, many of which were otherwise healthy adults. Understanding the cascade of biochemical events initiated in specific brain regions in the acute phase of dTBI and how this spreads into adjacent brain structures may provide the necessary insight into drive development of improved therapies. In this study, we have used direct biochemical imaging techniques (Fourier transform infrared spectroscopic imaging) and elemental mapping (X-ray fluorescence microscopy) to characterize biochemical and elemental alterations that occur in corpus callosum white matter in the acute phase of dTBI. The results provide direct visualization of differential biochemical and ionic changes that occur in the highly vulnerable medial corpus callosum white matter relative to the less vulnerable lateral regions of the corpus callosum. Specifically, the results suggest that altered ionic gradients manifest within mechanically damaged medial corpus callosum, potentially spreading to and inducing lipid alterations to white matter structures in lateral brain regions.
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Affiliation(s)
- David Hartnell
- Curtin Institute for Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, Perth, Western Australia, Australia 6845
- Curtin Health Innovation Research Institute, Curtin University, Perth, AUS 6102
| | - Kate Gillespie-Jones
- Neuroscience Program, Biomedicine Discovery Institute and Department of Physiology, Monash University, Clayton, Victoria, Australia 3168
| | - Cristina Ciornei
- Neuroscience Program, Biomedicine Discovery Institute and Department of Physiology, Monash University, Clayton, Victoria, Australia 3168
| | - Ashley Hollings
- Curtin Institute for Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, Perth, Western Australia, Australia 6845
- Curtin Health Innovation Research Institute, Curtin University, Perth, AUS 6102
| | - Alexander Thomas
- Curtin Institute for Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, Perth, Western Australia, Australia 6845
- Curtin Health Innovation Research Institute, Curtin University, Perth, AUS 6102
| | - Elizabeth Harrild
- Curtin Institute for Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, Perth, Western Australia, Australia 6845
- Curtin Health Innovation Research Institute, Curtin University, Perth, AUS 6102
| | - Juliane Reinhardt
- Australian Nuclear Science and Technology Organisation, 800 Blackburn Road, Clayton, Victoria, Australia 3168
- Department of Chemistry and Physics, ARC Centre of Excellence for Advanced Molecular Imaging, Institute for Molecular Sciences, La Trobe University, Melbourne, Victoria, Australia 3086
| | - David J. Paterson
- Australian Nuclear Science and Technology Organisation, 800 Blackburn Road, Clayton, Victoria, Australia 3168
| | - Dasuni Alwis
- Neuroscience Program, Biomedicine Discovery Institute and Department of Physiology, Monash University, Clayton, Victoria, Australia 3168
| | - Ramesh Rajan
- Neuroscience Program, Biomedicine Discovery Institute and Department of Physiology, Monash University, Clayton, Victoria, Australia 3168
| | - Mark J. Hackett
- Curtin Institute for Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, Perth, Western Australia, Australia 6845
- Curtin Health Innovation Research Institute, Curtin University, Perth, AUS 6102
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Carmona A, Roudeau S, Perrin L, Carcenac C, Vantelon D, Savasta M, Ortega R. Mapping Chemical Elements and Iron Oxidation States in the Substantia Nigra of 6-Hydroxydopamine Lesioned Rats Using Correlative Immunohistochemistry With Proton and Synchrotron Micro-Analysis. Front Neurosci 2019; 13:1014. [PMID: 31680798 PMCID: PMC6798047 DOI: 10.3389/fnins.2019.01014] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Accepted: 09/06/2019] [Indexed: 11/13/2022] Open
Abstract
Brain metal homeostasis is altered in neurodegenerative diseases and the concentration, the localization and/or the chemical speciation of the elements can be modified compared to healthy individuals. These changes are often specific to the brain region affected by the neurodegenerative process. For example, iron concentration is increased in the substantia nigra (SN) of Parkinson's disease patients and iron redox reactions might be involved in the pathogenesis. The identification of the molecular basis behind metal dyshomeostasis in specific brain regions is the subject of intensive research and chemical element imaging methods are particularly useful to address this issue. Among the imaging modalities available, Synchrotron X-ray fluorescence (SXRF) and particle induced X-ray emission (PIXE) using focused micro-beams can inform about the quantitative distribution of metals in specific brain regions. Micro-X-ray absorption near edge spectroscopy (XANES) can in addition identify the chemical species of the elements, in particular their oxidation state. However, in order to bring accurate information about metal changes in specific brain areas, these chemical imaging methods must be correlated to brain tissue histology. We present a methodology to perform chemical element quantitative mapping and speciation on well-identified brain regions using correlative immunohistochemistry. We applied this methodology to the study of an animal model of Parkinson's disease, the 6-hydroxydopamine (6-OHDA) lesioned rat. Tyrosine hydroxylase immunohistochemical staining enabled to identify the SN pars compacta (SNpc) and pars reticulata (SNpr) as well as the ventral tegmental area (VTA). Using PIXE we found that iron content was higher respectively in the SNpr > SNpc > VTA, but was not statistically significantly modified by 6-OHDA treatment. In addition, micro-SXRF revealed the higher manganese content in the SNpc compared to the SNpr. Using micro-XANES we identified Fe oxidation states in the SNpr and SNpc showing a spectral similarity comparable to ferritin for all brain regions and exposure conditions. This study illustrates the capability to correlate immunohistochemistry and chemical element imaging at the brain region level and this protocol can now be widely applied to other studies of metal dyshomeostasis in neurology.
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Affiliation(s)
- Asuncion Carmona
- UMR 5797, Chemical Imaging and Speciation, CENBG, University of Bordeaux, Gradignan, France.,UMR 5797, CNRS, IN2P3, CENBG, Gradignan, France
| | - Stéphane Roudeau
- UMR 5797, Chemical Imaging and Speciation, CENBG, University of Bordeaux, Gradignan, France.,UMR 5797, CNRS, IN2P3, CENBG, Gradignan, France
| | - Laura Perrin
- UMR 5797, Chemical Imaging and Speciation, CENBG, University of Bordeaux, Gradignan, France.,UMR 5797, CNRS, IN2P3, CENBG, Gradignan, France
| | - Carole Carcenac
- INSERM U1216, Physiopathologie de la Motivation, Grenoble, France.,Grenoble Institute of Neuroscience, Université Grenoble Alpes, Grenoble, France
| | | | - Marc Savasta
- INSERM U1216, Physiopathologie de la Motivation, Grenoble, France.,Grenoble Institute of Neuroscience, Université Grenoble Alpes, Grenoble, France.,Centre Hospitalier Universitaire de Grenoble, Grenoble, France
| | - Richard Ortega
- UMR 5797, Chemical Imaging and Speciation, CENBG, University of Bordeaux, Gradignan, France.,UMR 5797, CNRS, IN2P3, CENBG, Gradignan, France
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Hackett MJ, Hollings A, Majimbi M, Brook E, Cochran B, Giles C, Lam V, Nesbit M, Rye KA, Mamo JCL, Takechi R. Multimodal Imaging Analyses of Brain Hippocampal Formation Reveal Reduced Cu and Lipid Content and Increased Lactate Content in Non-Insulin-Dependent Diabetic Mice. ACS Chem Neurosci 2019; 10:2533-2540. [PMID: 30855947 DOI: 10.1021/acschemneuro.9b00039] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Non-insulin-dependent diabetes mellitus (NIDDM) is reported to increase the risk of cognitive impairment and dementia. However, the underlying mechanisms are not fully understood. While the brain homeostasis of metals and lipids is pivotal to maintaining energy metabolism and redox homeostasis for healthy brain function, no studies have reported hippocampal metal and biochemical changes in NIDDM. Therefore, we here utilized direct spectroscopic imaging to reveal the elemental distribution within the hippocampal subregions of an established murine model of NIDDM, db/db mice. In 26-week-old insulin resistant db/db mice, X-ray fluorescence microscopy revealed that the Cu content within the dentate gyrus and CA3 was significantly greater than that of the age-matched nondiabetic control mice. In addition, Fourier transform infrared (FTIR) spectroscopy analysis indicated a significant increase in the abundance of lactate within the corpus callosum (CC), dentate gyrus, CA1, and CA3 regions of diabetic db/db mice compared to that of the control, indicating altered energy metabolism. FTIR analysis also showed a significant decrease in the level of lipid methylene and ester within the CC of db/db mice. Furthermore, immunomicroscopy analyses demonstrated the increase in the level of glial fibrillary acidic protein expression and peri-vascular extravasation of IgG, indicating astrogliosis and blood-brain barrier dysfunction, respectively. These data suggest that astrogliosis-induced alterations in the supply of Cu, lipids, and energy substrates may be involved in the mechanisms of NIDDM-associated cognitive decline.
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Affiliation(s)
- Mark J. Hackett
- Curtin Health Innovation Research Institute, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
- Curtin Institute for Functional Molecules and Interfaces, School of Molecular and Life Science, Faculty of Science and Engineering, Curtin University, Bentley, WA 6102, Australia
| | - Ashley Hollings
- Curtin Health Innovation Research Institute, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
- Curtin Institute for Functional Molecules and Interfaces, School of Molecular and Life Science, Faculty of Science and Engineering, Curtin University, Bentley, WA 6102, Australia
| | - Maimuna Majimbi
- Curtin Health Innovation Research Institute, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
- School of Pharmacy and Biomedical Sciences, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Emily Brook
- Curtin Health Innovation Research Institute, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
- School of Pharmacy and Biomedical Sciences, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Blake Cochran
- School of Medical Sciences, Faculty of Medicine, UNSW, Sydney, NSW 2052, Australia
| | - Corey Giles
- Baker Heart and Diabetes Institute, Melbourne, VIC 3004, Australia
| | - Virginie Lam
- Curtin Health Innovation Research Institute, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
- School of Public Health, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Michael Nesbit
- Curtin Health Innovation Research Institute, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
- School of Public Health, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Kerry-Anne Rye
- School of Medical Sciences, Faculty of Medicine, UNSW, Sydney, NSW 2052, Australia
| | - John C. L. Mamo
- Curtin Health Innovation Research Institute, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
- School of Public Health, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Ryusuke Takechi
- Curtin Health Innovation Research Institute, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
- School of Public Health, Faculty of Health Sciences, Curtin University, Bentley, WA 6102, Australia
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