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Peerboom C, de Kater S, Jonker N, Rieter MPJM, Wijne T, Wierenga CJ. Delaying the GABA Shift Indirectly Affects Membrane Properties in the Developing Hippocampus. J Neurosci 2023; 43:5483-5500. [PMID: 37438107 PMCID: PMC10376938 DOI: 10.1523/jneurosci.0251-23.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 06/28/2023] [Accepted: 06/30/2023] [Indexed: 07/14/2023] Open
Abstract
During the first two postnatal weeks, intraneuronal chloride concentrations in rodents gradually decrease, causing a shift from depolarizing to hyperpolarizing GABA responses. The postnatal GABA shift is delayed in rodent models for neurodevelopmental disorders and in human patients, but the impact of a delayed GABA shift on the developing brain remains obscure. Here we examine the direct and indirect consequences of a delayed postnatal GABA shift on network development in organotypic hippocampal cultures made from 6- to 7-d-old mice by treating the cultures for 1 week with VU0463271, a specific inhibitor of the chloride exporter KCC2. We verified that VU treatment delayed the GABA shift and kept GABA signaling depolarizing until DIV9. We found that the structural and functional development of excitatory and inhibitory synapses at DIV9 was not affected after VU treatment. In line with previous studies, we observed that GABA signaling was already inhibitory in control and VU-treated postnatal slices. Surprisingly, 14 d after the VU treatment had ended (DIV21), we observed an increased frequency of spontaneous inhibitory postsynaptic currents in CA1 pyramidal cells, while excitatory currents were not changed. Synapse numbers and release probability were unaffected. We found that dendrite-targeting interneurons in the stratum radiatum had an elevated resting membrane potential, while pyramidal cells were less excitable compared with control slices. Our results show that depolarizing GABA signaling does not promote synapse formation after P7, and suggest that postnatal intracellular chloride levels indirectly affect membrane properties in a cell-specific manner.SIGNIFICANCE STATEMENT During brain development, the action of neurotransmitter GABA shifts from depolarizing to hyperpolarizing. This shift is a thought to play a critical role in synapse formation. A delayed shift is common in rodent models for neurodevelopmental disorders and in human patients, but its consequences for synaptic development remain obscure. Here, we delayed the GABA shift by 1 week in organotypic hippocampal cultures and carefully examined the consequences for circuit development. We find that delaying the shift has no direct effects on synaptic development, but instead leads to indirect, cell type-specific changes in membrane properties. Our data call for careful assessment of alterations in cellular excitability in neurodevelopmental disorders.
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Affiliation(s)
- Carlijn Peerboom
- Cell Biology, Neurobiology and Biophysics, Biology Department, Utrecht University, Utrecht, 3584 CH, The Netherlands
| | - Sam de Kater
- Cell Biology, Neurobiology and Biophysics, Biology Department, Utrecht University, Utrecht, 3584 CH, The Netherlands
| | - Nikki Jonker
- Cell Biology, Neurobiology and Biophysics, Biology Department, Utrecht University, Utrecht, 3584 CH, The Netherlands
| | - Marijn P J M Rieter
- Cell Biology, Neurobiology and Biophysics, Biology Department, Utrecht University, Utrecht, 3584 CH, The Netherlands
| | - Tessel Wijne
- Cell Biology, Neurobiology and Biophysics, Biology Department, Utrecht University, Utrecht, 3584 CH, The Netherlands
| | - Corette J Wierenga
- Cell Biology, Neurobiology and Biophysics, Biology Department, Utrecht University, Utrecht, 3584 CH, The Netherlands
- Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, 6525 AJ, The Netherlands
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González-Lao E, Corte Z, Simón M, Ricós C, Coskun A, Braga F, Aarsand AK, Carobene A, Bartlett WA, Boned B, Asland B, Díaz-Garzón J, Marqués-García F, Minchinela J, Perich C, Fernández-Calle P, Roraas T, Fernández-Fernández P, Jonker N, Sandberg S. Systematic review of the biological variation data for diabetes related analytes. Clin Chim Acta 2018; 488:61-67. [PMID: 30389455 DOI: 10.1016/j.cca.2018.10.031] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 10/19/2018] [Accepted: 10/24/2018] [Indexed: 10/28/2022]
Abstract
BACKGROUND Objective interpretation of laboratory test results used to diagnose and monitor diabetes mellitus in part requires the application of biological variation data (BVD). The quality of published BVD has been questioned. The aim of this study was to quality assess publications reporting BVD for diabetes-related analytes using the Biological Variation Data Critical Appraisal Checklist (BIVAC); to assess whether published BVD are fit for purpose and whether the study design and population attributes influence BVD estimates and to undertake a meta-analysis of the BVD from BIVAC-assessed publications. METHODS Publications reporting data for glucose, HbA1c, adiponectin, C-peptide, fructosamine, insulin like growth factor 1 (IGF-1), insulin like growth factor binding protein 3 (IGFBP-3), insulin, lactate and pyruvate were identified using a systematic literature search. These publications were assessed using the BIVAC, receiving grades A, B, C or D, where A is of highest quality. A meta-analysis of the BVD from the assessed studies utilised weightings based upon BIVAC grades and the width of the data confidence intervals to generate global BVD estimates. RESULTS BIVAC assessment of 47 publications delivered 1 A, 3 B, 39C and 4 D gradings. Publications relating to adiponectin, C-peptide, IGF-1, IGFBP-3, lactate and pyruvate were all assessed as grade C. Meta-analysis enabled global BV estimates for all analytes except pyruvate, lactate and fructosamine. CONCLUSIONS This study delivers updated and evidence-based BV estimates for diabetes-related analytes. There remains a need for delivery of new high-quality BV studies for several clinically important analytes.
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Affiliation(s)
- E González-Lao
- Spanish Society of Laboratory Medicine (SEQCML), Analytical Quality Commission, Spain; Quality Healthcare, Grupo ACMS, Madrid, Spain.
| | - Z Corte
- Spanish Society of Laboratory Medicine (SEQCML), Analytical Quality Commission, Spain; San Agustin University Hospital, Aviles, Asturias, Spain
| | - M Simón
- Spanish Society of Laboratory Medicine (SEQCML), Analytical Quality Commission, Spain; Intercomarcal laboratory consortiums of Alt Penedès, Anoia and Garraf, Barcelona, Spain
| | - C Ricós
- Spanish Society of Laboratory Medicine (SEQCML), Analytical Quality Commission, Spain
| | - A Coskun
- Acibadem University, School of Medicine, Atasehir, Istanbul, Turkey
| | - F Braga
- Research Centre for Metrological Traceability in Laboratory Medicine (CIRME), University of Milan, Milan, Italy
| | - A K Aarsand
- Norwegian Porphyria Centre, Laboratory of Clinical Biochemistry, Haukeland University Hospital, Bergen, Norway; Norwegian Quality Improvement of Laboratory Examinations (NOKLUS), Haraldsplass Deaconess Hospital, Bergen, Norway
| | - A Carobene
- Servizio Medicina di Laboratorio, Ospedale San Raffaele, Milan, Italy
| | - W A Bartlett
- Blood Sciences, Ninewells Hospital and Medical School, Scotland, UK
| | - B Boned
- Spanish Society of Laboratory Medicine (SEQCML), Analytical Quality Commission, Spain; Royo Villanova Hospital, Zaragoza, Spain
| | - B Asland
- Institute for Quality Management in Healthcare (IQMH), Centre for Proficiency Testing, Toronto, ON, Canada
| | - J Díaz-Garzón
- Spanish Society of Laboratory Medicine (SEQCML), Analytical Quality Commission, Spain; La Paz University Hospital, Madrid, Spain
| | - F Marqués-García
- Spanish Society of Laboratory Medicine (SEQCML), Analytical Quality Commission, Spain; Department of Clinical Biochemistry, University Hospital of Salamanca, Spain
| | - J Minchinela
- Spanish Society of Laboratory Medicine (SEQCML), Analytical Quality Commission, Spain; Metropolitana Nord Unified Laboratory (LUMN), Germans Trias I Pujol University Hospital, Badalona, Spain
| | - C Perich
- Spanish Society of Laboratory Medicine (SEQCML), Analytical Quality Commission, Spain; Laboratory of Hospital Vall d'Hebron, Barcelona, Spain
| | - P Fernández-Calle
- Spanish Society of Laboratory Medicine (SEQCML), Analytical Quality Commission, Spain; La Paz University Hospital, Madrid, Spain
| | - T Roraas
- Norwegian Quality Improvement of Laboratory Examinations (NOKLUS), Haraldsplass Deaconess Hospital, Bergen, Norway
| | - P Fernández-Fernández
- Spanish Society of Laboratory Medicine (SEQCML), Analytical Quality Commission, Spain
| | - N Jonker
- Certe, Wilhelmina Ziekenhuis Assen, Assen, the Netherlands
| | - S Sandberg
- Norwegian Porphyria Centre, Laboratory of Clinical Biochemistry, Haukeland University Hospital, Bergen, Norway; Norwegian Quality Improvement of Laboratory Examinations (NOKLUS), Haraldsplass Deaconess Hospital, Bergen, Norway; Department of Global Health and Primary Care, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway
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Jonker N, Kretschmer A, Kool J, Fernandez A, Kloos D, Krabbe JG, Lingeman H, Irth H. Online Magnetic Bead Dynamic Protein-Affinity Selection Coupled to LC−MS for the Screening of Pharmacologically Active Compounds. Anal Chem 2009; 81:4263-70. [PMID: 19476387 DOI: 10.1021/ac9000755] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- N. Jonker
- BioMolecular Analysis Group, Department of Chemistry, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - A. Kretschmer
- BioMolecular Analysis Group, Department of Chemistry, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - J. Kool
- BioMolecular Analysis Group, Department of Chemistry, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - A. Fernandez
- BioMolecular Analysis Group, Department of Chemistry, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - D. Kloos
- BioMolecular Analysis Group, Department of Chemistry, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - J. G. Krabbe
- BioMolecular Analysis Group, Department of Chemistry, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - H. Lingeman
- BioMolecular Analysis Group, Department of Chemistry, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - H. Irth
- BioMolecular Analysis Group, Department of Chemistry, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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Garrido P, Laher-Mooncey S, Murphree NL, Jonker N, Levy LF, Makarawo S. Neoplasms involving the spinal cord in Zimbabweans: an analysis of 262 cases. Cent Afr J Med 1994; 40:201-4. [PMID: 7812996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A review of 262 histologically verified spinal cord tumours in Black Zimbabweans who were operated on in Harare Central and Parirenyatwa Hospitals, Harare, Zimbabwe during the period 1st January 1972 to 31st December 1991 is presented. Fifty one pc of the neoplasms were found in the thoracic region, 53.4 pc were found extradurally, and of these the majority were metastatic (52 pc) and malignant tumours (85 pc). Most (96 pc) intradural-extramedullary tumours were benign with Schwannomas as the largest group (54 pc). Malignant astrocytomas presented as 71.4 pc of all intramedullary tumours. Metastatic tumours represented 28.6 pc of all spinal cord tumours. The most common sites of metastasis were from liver, thyroid and prostate.
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