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van Buel EM, Bosker FJ, van Drunen J, Strijker J, Douwenga W, Klein HC, Eisel ULM. Electroconvulsive seizures (ECS) do not prevent LPS-induced behavioral alterations and microglial activation. J Neuroinflammation 2015; 12:232. [PMID: 26654099 PMCID: PMC4676811 DOI: 10.1186/s12974-015-0454-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [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: 09/23/2015] [Accepted: 11/26/2015] [Indexed: 12/19/2022] Open
Abstract
Background Long-term neuroimmune activation is a common finding in major depressive disorder (MDD). Literature suggests a dual effect of electroconvulsive therapy (ECT), a highly effective treatment strategy for MDD, on neuroimmune parameters: while ECT acutely increases inflammatory parameters, such as serum levels of pro-inflammatory cytokines, there is evidence to suggest that repeated ECT sessions eventually result in downregulation of the inflammatory response. We hypothesized that this might be due to ECT-induced attenuation of microglial activity upon inflammatory stimuli in the brain. Methods Adult male C57Bl/6J mice received a series of ten electroconvulsive seizures (ECS) or sham shocks, followed by an intracerebroventricular (i.c.v.) lipopolysaccharide (LPS) or phosphate-buffered saline (PBS) injection. Brains were extracted and immunohistochemically stained for the microglial marker ionized calcium-binding adaptor molecule 1 (Iba1). In addition, a sucrose preference test and an open-field test were performed to quantify behavioral alterations. Results LPS induced a short-term reduction in sucrose preference, which normalized within 3 days. In addition, LPS reduced the distance walked in the open field and induced alterations in grooming and rearing behavior. ECS did not affect any of these parameters. Phenotypical analysis of microglia demonstrated an LPS-induced increase in microglial activity ranging from 84 to 213 % in different hippocampal regions (CA3 213 %; CA1 84 %; dentate gyrus 131 %; and hilus 123 %). ECS-induced alterations in microglial activity were insignificant, ranging from −2.6 to 14.3 % in PBS-injected mice and from −20.2 to 6.6 % in LPS-injected mice. Conclusions We were unable to demonstrate an effect of ECS on LPS-induced microglial activity or behavioral alterations. Electronic supplementary material The online version of this article (doi:10.1186/s12974-015-0454-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- E M van Buel
- Department of Molecular Neurobiology, Groningen Institute of Evolutionary Life Sciences, University of Groningen, Nijenborgh 7, 9747 AG, Groningen, Netherlands. .,Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen, University of Groningen, Groningen, Netherlands.
| | - F J Bosker
- Department of Psychiatry, University Medical Center Groningen, University of Groningen, Groningen, Netherlands.
| | - J van Drunen
- Department of Molecular Neurobiology, Groningen Institute of Evolutionary Life Sciences, University of Groningen, Nijenborgh 7, 9747 AG, Groningen, Netherlands.
| | - J Strijker
- Department of Molecular Neurobiology, Groningen Institute of Evolutionary Life Sciences, University of Groningen, Nijenborgh 7, 9747 AG, Groningen, Netherlands.
| | - W Douwenga
- Department of Molecular Neurobiology, Groningen Institute of Evolutionary Life Sciences, University of Groningen, Nijenborgh 7, 9747 AG, Groningen, Netherlands.
| | - H C Klein
- Department of Psychiatry, University Medical Center Groningen, University of Groningen, Groningen, Netherlands. .,Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen, University of Groningen, Groningen, Netherlands.
| | - U L M Eisel
- Department of Molecular Neurobiology, Groningen Institute of Evolutionary Life Sciences, University of Groningen, Nijenborgh 7, 9747 AG, Groningen, Netherlands. .,Department of Psychiatry, University Medical Center Groningen, University of Groningen, Groningen, Netherlands.
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Staal FJT, van der Luijt RB, Baert MRM, van Drunen J, van Bakel H, Peters E, de Valk I, van Amstel HKP, Taphoorn MJB, Jansen GH, van Veelen CWM, Burgering B, Staal GEJ. A novel germline mutation of PTEN associated with brain tumours of multiple lineages. Br J Cancer 2002; 86:1586-91. [PMID: 12085208 PMCID: PMC2746590 DOI: 10.1038/sj.bjc.6600206] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2001] [Revised: 01/07/2002] [Accepted: 01/24/2002] [Indexed: 11/30/2022] Open
Abstract
We have identified a novel germline mutation in the PTEN tumour suppressor gene. The mutation was identified in a patient with a glioma, and turned out to be a heterozygous germline mutation of PTEN (Arg234Gln), without loss of heterozygosity in tumour DNA. The biological consequences of this germline mutation were investigated by means of transfection studies of the mutant PTEN molecule compared to wild-type PTEN. In contrast to the wild-type molecule, the mutant PTEN protein is not capable of inducing apoptosis, induces increased cell proliferation and leads to high constitutive PKB/Akt activation, which cannot be increased anymore by stimulation with insulin. The reported patient, in addition to glioma, had suffered from benign meningioma in the past but did not show any clinical signs of Cowden disease or other hereditary diseases typically associated with PTEN germline mutations. The functional consequences of the mutation in transfection studies are consistent with high proliferative activity. Together, these findings suggest that the Arg234Gln missense mutation in PTEN has oncogenic properties and predisposes to brain tumours of multiple lineages.
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Affiliation(s)
- F J T Staal
- Department of Immunology, Erasmus University Rotterdam, Rotterdam, The Netherlands.
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Sprong H, Degroote S, Claessens T, van Drunen J, Oorschot V, Westerink BH, Hirabayashi Y, Klumperman J, van der Sluijs P, van Meer G. Glycosphingolipids are required for sorting melanosomal proteins in the Golgi complex. J Cell Biol 2001; 155:369-80. [PMID: 11673476 PMCID: PMC2150844 DOI: 10.1083/jcb.200106104] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Although glycosphingolipids are ubiquitously expressed and essential for multicellular organisms, surprisingly little is known about their intracellular functions. To explore the role of glycosphingolipids in membrane transport, we used the glycosphingolipid-deficient GM95 mouse melanoma cell line. We found that GM95 cells do not make melanin pigment because tyrosinase, the first and rate-limiting enzyme in melanin synthesis, was not targeted to melanosomes but accumulated in the Golgi complex. However, tyrosinase-related protein 1 still reached melanosomal structures via the plasma membrane instead of the direct pathway from the Golgi. Delivery of lysosomal enzymes from the Golgi complex to endosomes was normal, suggesting that this pathway is not affected by the absence of glycosphingolipids. Loss of pigmentation was due to tyrosinase mislocalization, since transfection of tyrosinase with an extended transmembrane domain, which bypassed the transport block, restored pigmentation. Transfection of ceramide glucosyltransferase or addition of glucosylsphingosine restored tyrosinase transport and pigmentation. We conclude that protein transport from Golgi to melanosomes via the direct pathway requires glycosphingolipids.
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Affiliation(s)
- H Sprong
- Department of Cell Biology and Histology, Academic Medical Center, University of Amsterdam, 1100 DE, Amsterdam, Netherlands
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