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Maas DA, Manot-Saillet B, Bun P, Habermacher C, Poilbout C, Rusconi F, Angulo MC. Correction: Versatile and automated workflow for the analysis of oligodendroglial calcium signals. Cell Mol Life Sci 2024; 81:109. [PMID: 38429363 PMCID: PMC10907438 DOI: 10.1007/s00018-024-05171-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2024]
Affiliation(s)
- Dorien A Maas
- Université Paris Cité, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, "Team: Interactions Between Neurons and Oligodendroglia in Myelination and Myelin Repair", 75014, Paris, France
| | - Blandine Manot-Saillet
- Université Paris Cité, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, "Team: Interactions Between Neurons and Oligodendroglia in Myelination and Myelin Repair", 75014, Paris, France
| | - Philippe Bun
- Université Paris Cité, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, "NeurImag Platform", 75014, Paris, France
| | - Chloé Habermacher
- Université Paris Cité, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, "Team: Interactions Between Neurons and Oligodendroglia in Myelination and Myelin Repair", 75014, Paris, France
- SynapCell, Bâtiment Synergy Zac Isiparc, 38330, Saint Ismier, France
| | - Corinne Poilbout
- Université Paris Cité, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, "Team: Interactions Between Neurons and Oligodendroglia in Myelination and Myelin Repair", 75014, Paris, France
| | - Filippo Rusconi
- IDEEV, GQE, Université Paris-Saclay, CNRS, INRAE, AgroParisTech, 12, Route 128, 91272, Gif-sur-Yvette, France
- Centre de Recherche des Cordeliers, Sorbonne Université, INSERM, Université Paris Cité, 75006, Paris, France
| | - Maria Cecilia Angulo
- Université Paris Cité, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, "Team: Interactions Between Neurons and Oligodendroglia in Myelination and Myelin Repair", 75014, Paris, France.
- GHU PARIS Psychiatrie and Neurosciences, 75014, Paris, France.
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Maas DA, Manot-Saillet B, Bun P, Habermacher C, Poilbout C, Rusconi F, Angulo MC. Versatile and automated workflow for the analysis of oligodendroglial calcium signals. Cell Mol Life Sci 2024; 81:15. [PMID: 38194116 DOI: 10.1007/s00018-023-05065-3] [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: 02/02/2023] [Revised: 11/20/2023] [Accepted: 11/27/2023] [Indexed: 01/10/2024]
Abstract
Although intracellular Ca2+ signals of oligodendroglia, the myelin-forming cells of the central nervous system, regulate vital cellular processes including myelination, few studies on oligodendroglia Ca2+ signal dynamics have been carried out and existing software solutions are not adapted to the analysis of the complex Ca2+ signal characteristics of these cells. Here, we provide a comprehensive solution to analyze oligodendroglia Ca2+ imaging data at the population and single-cell levels. We describe a new analytical pipeline containing two free, open source and cross-platform software programs, Occam and post-prOccam, that enable the fully automated analysis of one- and two-photon Ca2+ imaging datasets from oligodendroglia obtained by either ex vivo or in vivo Ca2+ imaging techniques. Easily configurable, our software solution is optimized to obtain unbiased results from large datasets acquired with different imaging techniques. Compared to other recent software, our solution proved to be fast, low memory demanding and faithful in the analysis of oligodendroglial Ca2+ signals in all tested imaging conditions. Our versatile and accessible Ca2+ imaging data analysis tool will facilitate the elucidation of Ca2+-mediated mechanisms in oligodendroglia. Its configurability should also ensure its suitability with new use cases such as other glial cell types or even cells outside the CNS.
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Affiliation(s)
- Dorien A Maas
- Université Paris Cité, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, "Team: Interactions Between Neurons and Oligodendroglia in Myelination and Myelin Repair", 75014, Paris, France
| | - Blandine Manot-Saillet
- Université Paris Cité, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, "Team: Interactions Between Neurons and Oligodendroglia in Myelination and Myelin Repair", 75014, Paris, France
| | - Philippe Bun
- Université Paris Cité, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, "NeurImag Platform", 75014, Paris, France
| | - Chloé Habermacher
- Université Paris Cité, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, "Team: Interactions Between Neurons and Oligodendroglia in Myelination and Myelin Repair", 75014, Paris, France
- SynapCell, Bâtiment Synergy Zac Isiparc, 38330, Saint Ismier, France
| | - Corinne Poilbout
- Université Paris Cité, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, "Team: Interactions Between Neurons and Oligodendroglia in Myelination and Myelin Repair", 75014, Paris, France
| | - Filippo Rusconi
- IDEEV, GQE, Université Paris-Saclay, CNRS, INRAE, AgroParisTech, 12, Route 128, 91272, Gif-sur-Yvette, France
- Centre de Recherche des Cordeliers, Sorbonne Université, INSERM, Université Paris Cité, 75006, Paris, France
| | - Maria Cecilia Angulo
- Université Paris Cité, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, "Team: Interactions Between Neurons and Oligodendroglia in Myelination and Myelin Repair", 75014, Paris, France.
- GHU PARIS Psychiatrie and Neurosciences, 75014, Paris, France.
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Bright Y, Maas DA, Verheij MM, Paladini MS, Amatdjais-Groenen HI, Molteni R, Riva MA, Martens GJ, Homberg JR. The Natural Protoalkaloid Methyl-2-Amino-3-Methoxybenzoate (MAM) Alleviates Positive as well as Cognitive Symptoms in Rat and Mouse Schizophrenia Models. Curr Neuropharmacol 2024; 22:323-338. [PMID: 37475559 PMCID: PMC10788887 DOI: 10.2174/1570159x21666230720122354] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 01/19/2023] [Accepted: 01/19/2023] [Indexed: 07/22/2023] Open
Abstract
The development of new antipsychotics with pro-cognitive properties and less side effects represents a priority in schizophrenia drug research. In this study, we present for the first time a preclinical exploration of the effects of the promising natural atypical antipsychotic Methyl-2-Amino-3- Methoxybenzoate (MAM), a brain-penetrable protoalkaloid from the seed of the plant Nigella damascena. Using animal models related to hyperdopaminergic activity, namely the pharmacogenetic apomorphine (D2/D1 receptor agonist)-susceptible (APO-SUS) rat model and pharmacologically induced mouse and rat models of schizophrenia, we found that MAM reduced gnawing stereotypy and climbing behaviours induced by dopaminergic agents. This predicts antipsychotic activity. In line, MAM antagonized apomorphine-induced c-Fos and NPAS4 mRNA levels in post-mortem brain nucleus accumbens and dorsolateral striatum of APO-SUS rats. Furthermore, phencyclidine (PCP, an NMDA receptor antagonist) and 2,5-Dimethoxy-4-iodoamphetamine (DOI, a 5HT2A/2C receptor agonist) induced prepulse inhibition deficits, reflecting the positive symptoms of schizophrenia, which were rescued by treatment with MAM and atypical antipsychotics alike. Post-mortem brain immunostaining revealed that MAM blocked the strong activation of both PCP- and DOI-induced c-Fos immunoreactivity in a number of cortical areas. Finally, during a 28-day subchronic treatment regime, MAM did not induce weight gain, hyperglycemia, hyperlipidemia or hepato- and nephrotoxic effects, side effects known to be induced by atypical antipsychotics. MAM also did not show any cataleptic effects. In conclusion, its brain penetrability, the apparent absence of preclinical side effects, and its ability to antagonize positive and cognitive symptoms associated with schizophrenia make MAM an exciting new antipsychotic drug that deserves clinical testing.
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Affiliation(s)
- Yami Bright
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Dorien A. Maas
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Centre, Nijmegen, The Netherlands
- Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Faculty of Science, Nijmegen, The Netherlands
- Department of Anatomy and Neurosciences, Amsterdam Neuroscience, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Michel M.M. Verheij
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Maria S. Paladini
- Department of Pharmacological and Biomolecular Sciences, Universita’ degli Studi di Milano, Milan, Italy
- Altos Labs Bay Area Institute of Science, Altos Labs, Inc., Redwood City, CA, USA
| | | | - Raffaella Molteni
- Department of Medical Biotechnology and Translational Medicine, Universita’ degli Studi di Milano, Milan, Italy
| | - Marco A. Riva
- Department of Pharmacological and Biomolecular Sciences, Universita’ degli Studi di Milano, Milan, Italy
- Biological Psychiatry Unit, IRCCS Istituto Centro San Giovanni di Dio Fatebenefratelli, Brescia, Italy
| | - Gerard J.M. Martens
- Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Faculty of Science, Nijmegen, The Netherlands
| | - Judith R. Homberg
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Centre, Nijmegen, The Netherlands
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Maas DA, Douw L. Multiscale network neuroscience in neuro-oncology: How tumors, brain networks, and behavior connect across scales. Neurooncol Pract 2023; 10:506-517. [PMID: 38026586 PMCID: PMC10666814 DOI: 10.1093/nop/npad044] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2023] Open
Abstract
Network neuroscience refers to the investigation of brain networks across different spatial and temporal scales, and has become a leading framework to understand the biology and functioning of the brain. In neuro-oncology, the study of brain networks has revealed many insights into the structure and function of cells, circuits, and the entire brain, and their association with both functional status (e.g., cognition) and survival. This review connects network findings from different scales of investigation, with the combined aim of informing neuro-oncological healthcare professionals on this exciting new field and also delineating the promising avenues for future translational and clinical research that may allow for application of network methods in neuro-oncological care.
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Affiliation(s)
- Dorien A Maas
- Amsterdam UMC location Vrije Universiteit Amsterdam, Department of Anatomy and Neurosciences, Amsterdam, The Netherlands
- Cancer Center Amsterdam, Amsterdam, The Netherlands
- Amsterdam Neuroscience, Amsterdam, The Netherlands
| | - Linda Douw
- Amsterdam UMC location Vrije Universiteit Amsterdam, Department of Anatomy and Neurosciences, Amsterdam, The Netherlands
- Cancer Center Amsterdam, Amsterdam, The Netherlands
- Amsterdam Neuroscience, Amsterdam, The Netherlands
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Adraoui FW, Douw L, Martens GJM, Maas DA. Connecting Neurobiological Features with Interregional Dysconnectivity in Social-Cognitive Impairments of Schizophrenia. Int J Mol Sci 2023; 24:ijms24097680. [PMID: 37175387 PMCID: PMC10177877 DOI: 10.3390/ijms24097680] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 04/18/2023] [Accepted: 04/19/2023] [Indexed: 05/15/2023] Open
Abstract
Schizophrenia (SZ) is a devastating psychiatric disorder affecting about 1% of the world's population. Social-cognitive impairments in SZ prevent positive social interactions and lead to progressive social withdrawal. The neurobiological underpinnings of social-cognitive symptoms remain poorly understood, which hinders the development of novel treatments. At the whole-brain level, an abnormal activation of social brain regions and interregional dysconnectivity within social-cognitive brain networks have been identified as major contributors to these symptoms. At the cellular and subcellular levels, an interplay between oxidative stress, neuroinflammation and N-methyl-D-aspartate receptor hypofunction is thought to underly SZ pathology. However, it is not clear how these molecular processes are linked with interregional dysconnectivity in the genesis of social-cognitive symptoms. Here, we aim to bridge the gap between macroscale (connectivity analyses) and microscale (molecular and cellular mechanistic) knowledge by proposing impaired myelination and the disinhibition of local microcircuits as possible causative biological pathways leading to dysconnectivity and abnormal activity of the social brain. Furthermore, we recommend electroencephalography as a promising translational technique that can foster pre-clinical drug development and discuss attractive drug targets for the treatment of social-cognitive symptoms in SZ.
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Affiliation(s)
- Florian W Adraoui
- Biotrial, Preclinical Pharmacology Department, 7-9 rue Jean-Louis Bertrand, 35000 Rennes, France
| | - Linda Douw
- Anatomy and Neurosciences, Amsterdam UMC Location Vrije Universiteit Amsterdam, Boelelaan, 1081 HZ Amsterdam, The Netherlands
| | - Gerard J M Martens
- Donders Centre for Neuroscience (DCN), Department of Molecular Animal Physiology, Faculty of Science, Donders Institute for Brain, Cognition and Behavior, Radboud University, 6525 GA Nijmegen, The Netherlands
- NeuroDrug Research Ltd., 6525 ED Nijmegen, The Netherlands
| | - Dorien A Maas
- Anatomy and Neurosciences, Amsterdam UMC Location Vrije Universiteit Amsterdam, Boelelaan, 1081 HZ Amsterdam, The Netherlands
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Abstract
Enhanced neuronal activity in the healthy brain can induce de novo myelination and behavioral changes. As neuronal activity can be achieved using non-invasive measures, it may be of interest to utilize the innate ability of neuronal activity to instruct myelination as a novel strategy for myelin repair in demyelinating disorders such as multiple sclerosis (MS). Preclinical studies indicate that stimulation of neuronal activity in demyelinated lesions indeed has the potential to improve remyelination and that the stimulation paradigm is an important determinant of success. However, future studies will need to reveal the most efficient stimulation protocols as well as the biological mechanisms implicated. Nonetheless, clinical studies have already explored non-invasive brain stimulation as an attractive therapeutic approach that ameliorates MS symptomatology. However, whether symptom improvement is due to improved myelin repair remains unclear. In this mini-review, we discuss the neurobiological basis and potential of enhancing neuronal activity as a novel therapeutic approach in MS.
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Affiliation(s)
- Dorien A Maas
- Université de Paris, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, Paris, France
| | - María Cecilia Angulo
- Université de Paris, Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, Paris, France.,GHU PARIS Psychiatrie et Neurosciences, Paris, France
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Maas DA, Martens MB, Priovoulos N, Zuure WA, Homberg JR, Nait-Oumesmar B, Martens GJM. Key role for lipids in cognitive symptoms of schizophrenia. Transl Psychiatry 2020; 10:399. [PMID: 33184259 PMCID: PMC7665187 DOI: 10.1038/s41398-020-01084-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 10/02/2020] [Accepted: 10/26/2020] [Indexed: 12/19/2022] Open
Abstract
Schizophrenia (SZ) is a psychiatric disorder with a convoluted etiology that includes cognitive symptoms, which arise from among others a dysfunctional dorsolateral prefrontal cortex (dlPFC). In our search for the molecular underpinnings of the cognitive deficits in SZ, we here performed RNA sequencing of gray matter from the dlPFC of SZ patients and controls. We found that the differentially expressed RNAs were enriched for mRNAs involved in the Liver X Receptor/Retinoid X Receptor (LXR/RXR) lipid metabolism pathway. Components of the LXR/RXR pathway were upregulated in gray matter but not in white matter of SZ dlPFC. Intriguingly, an analysis for shared genetic etiology, using two SZ genome-wide association studies (GWASs) and GWAS data for 514 metabolites, revealed genetic overlap between SZ and acylcarnitines, VLDL lipids, and fatty acid metabolites, which are all linked to the LXR/RXR signaling pathway. Furthermore, analysis of structural T1-weighted magnetic resonance imaging in combination with cognitive behavioral data showed that the lipid content of dlPFC gray matter is lower in SZ patients than in controls and correlates with a tendency towards reduced accuracy in the dlPFC-dependent task-switching test. We conclude that aberrations in LXR/RXR-regulated lipid metabolism lead to a decreased lipid content in SZ dlPFC that correlates with reduced cognitive performance.
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Affiliation(s)
- Dorien A. Maas
- grid.5590.90000000122931605Faculty of Science, Centre for Neuroscience, Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen, Geert Grooteplein Zuid 26-28, 6525 GA Nijmegen, The Netherlands ,Sorbonne Université, Paris Brain Institute – ICM, Inserm U1127, CNRS UMR 7225, Hôpital Pitié-Salpêtrière, Paris, France ,Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behavior, Donders Centre for Medical Neuroscience, Radboud University Medical Center, Kapittelweg 29, 6525 EN Nijmegen, The Netherlands
| | - Marijn B. Martens
- NeuroDrug Research Ltd, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
| | - Nikos Priovoulos
- grid.458380.20000 0004 0368 8664Spinoza Centre for Neuroimaging, Meibergdreef 75, Amsterdam-Zuidoost, 1105 BK Amsterdam, The Netherlands
| | - Wieteke A. Zuure
- grid.5590.90000000122931605Faculty of Science, Centre for Neuroscience, Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen, Geert Grooteplein Zuid 26-28, 6525 GA Nijmegen, The Netherlands
| | - Judith R. Homberg
- Department of Cognitive Neuroscience, Donders Institute for Brain, Cognition and Behavior, Donders Centre for Medical Neuroscience, Radboud University Medical Center, Kapittelweg 29, 6525 EN Nijmegen, The Netherlands
| | - Brahim Nait-Oumesmar
- Sorbonne Université, Paris Brain Institute – ICM, Inserm U1127, CNRS UMR 7225, Hôpital Pitié-Salpêtrière, Paris, France
| | - Gerard J. M. Martens
- grid.5590.90000000122931605Faculty of Science, Centre for Neuroscience, Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen, Geert Grooteplein Zuid 26-28, 6525 GA Nijmegen, The Netherlands ,NeuroDrug Research Ltd, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
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Jager A, Maas DA, Fricke K, de Vries RB, Poelmans G, Glennon JC. Aggressive behavior in transgenic animal models: A systematic review. Neurosci Biobehav Rev 2018; 91:198-217. [DOI: 10.1016/j.neubiorev.2017.09.028] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 08/10/2017] [Accepted: 09/19/2017] [Indexed: 11/25/2022]
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Selten MM, Meyer F, Ba W, Vallès A, Maas DA, Negwer M, Eijsink VD, van Vugt RWM, van Hulten JA, van Bakel NHM, Roosen J, van der Linden RJ, Schubert D, Verheij MMM, Kasri NN, Martens GJM. Increased GABA B receptor signaling in a rat model for schizophrenia. Sci Rep 2016; 6:34240. [PMID: 27687783 PMCID: PMC5043235 DOI: 10.1038/srep34240] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Accepted: 09/05/2016] [Indexed: 02/04/2023] Open
Abstract
Schizophrenia is a complex disorder that affects cognitive function and has been linked, both in patients and animal models, to dysfunction of the GABAergic system. However, the pathophysiological consequences of this dysfunction are not well understood. Here, we examined the GABAergic system in an animal model displaying schizophrenia-relevant features, the apomorphine-susceptible (APO-SUS) rat and its phenotypic counterpart, the apomorphine-unsusceptible (APO-UNSUS) rat at postnatal day 20-22. We found changes in the expression of the GABA-synthesizing enzyme GAD67 specifically in the prelimbic- but not the infralimbic region of the medial prefrontal cortex (mPFC), indicative of reduced inhibitory function in this region in APO-SUS rats. While we did not observe changes in basal synaptic transmission onto LII/III pyramidal cells in the mPFC of APO-SUS compared to APO-UNSUS rats, we report reduced paired-pulse ratios at longer inter-stimulus intervals. The GABAB receptor antagonist CGP 55845 abolished this reduction, indicating that the decreased paired-pulse ratio was caused by increased GABAB signaling. Consistently, we find an increased expression of the GABAB1 receptor subunit in APO-SUS rats. Our data provide physiological evidence for increased presynaptic GABAB signaling in the mPFC of APO-SUS rats, further supporting an important role for the GABAergic system in the pathophysiology of schizophrenia.
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Affiliation(s)
- Martijn M. Selten
- Department of Cognitive Neuroscience, Radboud University Medical Center, Donders Institute for Brain, Cognition, and Behaviour, Nijmegen, the Netherlands
| | - Francisca Meyer
- Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Centre for Neuroscience, Radboud University, Nijmegen, the Netherlands
| | - Wei Ba
- Department of Cognitive Neuroscience, Radboud University Medical Center, Donders Institute for Brain, Cognition, and Behaviour, Nijmegen, the Netherlands
- Department of Human Genetics, Radboud University Medical Center, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, the Netherlands
| | - Astrid Vallès
- Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Centre for Neuroscience, Radboud University, Nijmegen, the Netherlands
- Department of Cognitive Neuroscience, Faculty of Psychology and Neurosciences, Maastricht University, Maastricht, the Netherlands
| | - Dorien A. Maas
- Department of Cognitive Neuroscience, Radboud University Medical Center, Donders Institute for Brain, Cognition, and Behaviour, Nijmegen, the Netherlands
- Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Centre for Neuroscience, Radboud University, Nijmegen, the Netherlands
| | - Moritz Negwer
- Department of Language and Genetics, Max Planck Institute for Psycholinguistics, Nijmegen, the Netherlands
| | - Vivian D. Eijsink
- Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Centre for Neuroscience, Radboud University, Nijmegen, the Netherlands
| | - Ruben W. M. van Vugt
- Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Centre for Neuroscience, Radboud University, Nijmegen, the Netherlands
| | - Josephus A. van Hulten
- Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Centre for Neuroscience, Radboud University, Nijmegen, the Netherlands
| | - Nick H. M. van Bakel
- Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Centre for Neuroscience, Radboud University, Nijmegen, the Netherlands
| | - Joey Roosen
- Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Centre for Neuroscience, Radboud University, Nijmegen, the Netherlands
| | - Robert J. van der Linden
- Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Centre for Neuroscience, Radboud University, Nijmegen, the Netherlands
| | - Dirk Schubert
- Department of Cognitive Neuroscience, Radboud University Medical Center, Donders Institute for Brain, Cognition, and Behaviour, Nijmegen, the Netherlands
| | - Michel M. M. Verheij
- Department of Cognitive Neuroscience, Radboud University Medical Center, Donders Institute for Brain, Cognition, and Behaviour, Nijmegen, the Netherlands
| | - Nael Nadif Kasri
- Department of Cognitive Neuroscience, Radboud University Medical Center, Donders Institute for Brain, Cognition, and Behaviour, Nijmegen, the Netherlands
- Department of Human Genetics, Radboud University Medical Center, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, the Netherlands
| | - Gerard J. M. Martens
- Department of Molecular Animal Physiology, Donders Institute for Brain, Cognition and Behaviour, Centre for Neuroscience, Radboud University, Nijmegen, the Netherlands
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Franken DR, Slabber CF, Maas DA, Giesteira MV. Forward progression of spermatozoa. Standardization of results. S Afr Med J 1978; 54:438-40. [PMID: 734562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The principal aim of this study was to determine whether subjective estimations of sperm velocity in our laboratory could readily be translated into objective figures. The technique for measuring the progression of human spermatozoa in seminal plasma in objective fashion was the one used by Janick and MacLeod in 1970. We therefore compared our objective figures with those of these authors and found a remarkable correlation between their values and ours. However, we went a step further and standardized the different objective values found in the study. Three simple equations were determined, by means of which each laboratory will be able to standardize their subject scale for forward progression of the spermatozoa.
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Maas DA, Slabber CF. Diagnosis and treatment of advanced extra-uterine pregnancy. S Afr Med J 1975; 49:2007-10. [PMID: 1198234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Eighteen cases of advanced extra-uterine pregnancy are reported. The difficulty of diagnosis is discussed; the only symptoms of any help were amenorrhoea, lower abdominal pain, postmaturity and failed induction of labour. The physical findings were variable and none were absolutely reliable. In 17 cases the fetus was dead on admission and early laparotomy was performed, and in 17 patients it was possible to remove the placenta completely.
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