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Luehr TC, Koide EM, Wang X, Han J, Borchers CH, Helbing CC. Metabolomic insights into the effects of thyroid hormone on Rana [Lithobates] catesbeiana metamorphosis using whole-body Matrix Assisted Laser Desorption/Ionization-Mass Spectrometry Imaging (MALDI-MSI). Gen Comp Endocrinol 2018; 265:237-245. [PMID: 29470956 DOI: 10.1016/j.ygcen.2018.02.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 02/14/2018] [Accepted: 02/14/2018] [Indexed: 02/07/2023]
Abstract
Anuran metamorphosis involves the transformation of an aquatic tadpole into a juvenile frog. This process is completely dependent upon thyroid hormones (THs). Although much research has been focused on changes in gene expression programs during this postembryonic developmental period, transitions in the metabolic profiles are relatively poorly understood. Matrix Assisted Laser Desorption/Ionization-Mass Spectrometry Imaging (MALDI-MSI) is a technique that generates highly multiplexed mass spectra while retaining spatial location information on a thin tissue section. Reconstructed ion heat maps are correlated with morphology of the tissue section for biological interpretation. The present study is the first to use whole-body MALDI-MSI on tadpoles to gain insights into anuran metamorphosis. Approximately 1000 features were detected in each of five tissues examined (brain, eye, liver, notochord, and tail muscle) from premetamorphic North American bullfrog (Rana [Lithobates] catesbeiana) tadpoles. Of these detected metabolites, 1700 were unique and 136 were significantly affected by exposure to 50 nM thyroxine for 48 h. Of the significantly-affected metabolites, 64 features were tentatively identified using the MassTRIX annotation tool. All tissues revealed changes in lipophilic compounds including phosphatidylcholines, phosphatidylinositols, phosphatidylglycerols, phosphatidylethanolamines, and phosphatidylserines. These lipophilic compounds made up the largest portion of significantly-affected metabolites indicating that lipid signaling is a major target of TH action in frog tadpoles.
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Affiliation(s)
- Teesha C Luehr
- Department of Biochemistry & Microbiology, University of Victoria, Victoria, BC V8P 5C2, Canada; University of Victoria - Genome British Columbia Proteomics Centre, Vancouver Island Technology Park, Victoria, BC V8Z 7X8, BC, Canada
| | - Emily M Koide
- Department of Biochemistry & Microbiology, University of Victoria, Victoria, BC V8P 5C2, Canada
| | - Xiaodong Wang
- University of Victoria - Genome British Columbia Proteomics Centre, Vancouver Island Technology Park, Victoria, BC V8Z 7X8, BC, Canada
| | - Jun Han
- University of Victoria - Genome British Columbia Proteomics Centre, Vancouver Island Technology Park, Victoria, BC V8Z 7X8, BC, Canada
| | - Christoph H Borchers
- Department of Biochemistry & Microbiology, University of Victoria, Victoria, BC V8P 5C2, Canada; University of Victoria - Genome British Columbia Proteomics Centre, Vancouver Island Technology Park, Victoria, BC V8Z 7X8, BC, Canada; Proteomics Centre, Segal Cancer Centre, Lady Davis Institute, Jewish General Hospital, McGill University, Montreal, Quebec H3T 1E2, Canada; Gerald Bronfman Department of Oncology, Jewish General Hospital, McGill University, Montreal, Quebec H3T 1E2, Canada
| | - Caren C Helbing
- Department of Biochemistry & Microbiology, University of Victoria, Victoria, BC V8P 5C2, Canada.
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Takahashi T, Shimizu H, Akagi R, Morita K, Sassa S. Heme oxygenase-1: a new drug target in oxidative tissue injuries in critically ill conditions. Drug Dev Res 2006. [DOI: 10.1002/ddr.20073] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Yamauchi T, Lin Y, Sharp FR, Noble-Haeusslein LJ. Hemin induces heme oxygenase-1 in spinal cord vasculature and attenuates barrier disruption and neutrophil infiltration in the injured murine spinal cord. J Neurotrauma 2004; 21:1017-30. [PMID: 15319001 DOI: 10.1089/0897715041651042] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Heme oxygenase-1 (HO-1) has been shown to alter vascular function in part by attenuating inflammation. We induced HO-1 in blood vessels in the spinal cord by systemic administration of hemin. Twenty-four hours later, immediately prior to euthanasia, fluorescence conjugated Lycopersicon esculentum (tomato) lectin was given intravenously to label the vasculature. HO-1 was induced in blood vessels, particularly in the white matter, as evidenced by the immunolocalization of HO-1 in lectin positive vessels. Western blots confirmed the hemin-mediated induction of HO-1 in the uninjured spinal cord. We next examined the extent to which treatment with hemin or vehicle, 24 h prior to a moderate contusion injury, influenced early vascular dysfunction in the injured cord. All animals were euthanized 24 h after injury. Luciferase, a marker of barrier integrity, was given intravenously 30 min prior to euthanasia. The spinal cord was either prepared for quantification of luciferase activity or fixed by vascular perfusion and prepared for the immunolocalization of neutrophils. There was a significant attenuation of barrier permeability to luciferase and a significant reduction in the number of neutrophils in hemin treated animals as compared to the vehicle treated group. Together, these findings demonstrate that vascular induction of HO-1 modulates barrier function and neutrophil infiltration and suggest that this protein may be useful for limiting the early vascular dysfunction and inflammation that occurs in the acutely injured spinal cord.
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Affiliation(s)
- Toshihiro Yamauchi
- Department of Neurological Surgery, University of California at San Francisco, San Francisco, California, USA
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