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Bethlehem C, Jongsma M, Korporaal-Heijman J, Yska JP. Cardiac arrest following chloroquine overdose treated with bicarbonate and lipid emulsion. Neth J Med 2019; 77:186-188. [PMID: 31264584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We describe a 27-year-old female with repeated episodes of pulseless electrical activity due to intoxication with a substance that was unidentified at presentation. Severe QRS widening was observed and empiric treatment with sodium bicarbonate and intravenous lipid emulsion was administered. In this case, intraosseous administration of lipid emulsion failed to improve haemodynamic parameters, suggesting that this dose remained in the bone marrow compartment. We recommend that physicians become aware of this possibility and to avoid intraosseous administration of lipid emulsion.
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Affiliation(s)
- C Bethlehem
- Department of Intensive Care, ZGT Hospital, Almelo, the Netherlands
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Jongsma M, Sangen A, Baas C, Aarts P, van der Lubbe R, Meulenbroek R, Steenbergen B. P557: Event-related potentials elicited in a motor imagery task in children with unilateral CP reveal motor imagery capacity with respect to the unaffected, but not the affected hand. Clin Neurophysiol 2014. [DOI: 10.1016/s1388-2457(14)50651-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Jongsma M, Matas-Rico E, Rzadkowski A, Jalink K, Moolenaar WH. LPA is a chemorepellent for B16 melanoma cells: action through the cAMP-elevating LPA5 receptor. PLoS One 2011; 6:e29260. [PMID: 22195035 PMCID: PMC3237609 DOI: 10.1371/journal.pone.0029260] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2011] [Accepted: 11/23/2011] [Indexed: 01/08/2023] Open
Abstract
Lysophosphatidic acid (LPA), a lipid mediator enriched in serum, stimulates cell migration, proliferation and other functions in many cell types. LPA acts on six known G protein-coupled receptors, termed LPA1–6, showing both overlapping and distinct signaling properties. Here we show that, unexpectedly, LPA and serum almost completely inhibit the transwell migration of B16 melanoma cells, with alkyl-LPA(18∶1) being 10-fold more potent than acyl-LPA(18∶1). The anti-migratory response to LPA is highly polarized and dependent on protein kinase A (PKA) but not Rho kinase activity; it is associated with a rapid increase in intracellular cAMP levels and PIP3 depletion from the plasma membrane. B16 cells express LPA2, LPA5 and LPA6 receptors. We show that LPA-induced chemorepulsion is mediated specifically by the alkyl-LPA-preferring LPA5 receptor (GPR92), which raises intracellular cAMP via a noncanonical pathway. Our results define LPA5 as an anti-migratory receptor and they implicate the cAMP-PKA pathway, along with reduced PIP3 signaling, as an effector of chemorepulsion in B16 melanoma cells.
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Affiliation(s)
- Maikel Jongsma
- Division of Cell Biology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Elisa Matas-Rico
- Division of Cell Biology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Adrian Rzadkowski
- Division of Cell Biology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Kees Jalink
- Division of Cell Biology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Wouter H. Moolenaar
- Division of Cell Biology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
- * E-mail:
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Jongsma M, van Unen J, van Loenen PB, Michel MC, Peters SLM, Alewijnse AE. Different response patterns of several ligands at the sphingosine-1-phosphate receptor subtype 3 (S1P(3)). Br J Pharmacol 2009; 156:1305-11. [PMID: 19309361 DOI: 10.1111/j.1476-5381.2009.00134.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
BACKGROUND AND PURPOSE Recently, some ligands targeting the sphingosine-1-phosphate receptor subtype 3 (S1P(3)) have become available. The characterization of these compounds was mainly based on one functional read-out system, although S1P(3) receptors are known to activate different signal transduction pathways. Therefore, this study pharmacologically characterizes these compounds using different assays. EXPERIMENTAL APPROACH Using CHO-FlpIn cells expressing the human S1P(3) receptor the potencies and maximal effects of S1P, FTY720-P, VPC23019, VPC23153 and VPC24191 were determined in three different assays [inhibition of cAMP accumulation, elevation of intracellular calcium concentrations ([Ca(2+)](i)) and S1P(3) receptor internalization]. KEY RESULTS All compounds tested inhibited forskolin-induced cAMP accumulation, increased [Ca(2+)](i) and induced S1P(3) receptor internalization but with different potencies and maximal effects. S1P was the most potent compound in all assays followed by FTY720-P. The VPC compounds were generally less potent than S1P and FTY720-P. Regarding the maximal effects, all compounds except VPC23153, behaved as full agonists in the cAMP accumulation assay. In the calcium assay, FTY720-P, VPC23019 and VPC24191 displayed partial and VPC23153 weak partial agonist activity, relative to S1P. Interestingly, treatment with the G(i) inactivator Pertussis toxin, did not affect S1P-induced [Ca(2+)](i) elevations but inhibited those in response to the other compounds, by about 50%. CONCLUSIONS AND IMPLICATIONS This study demonstrated differential response patterns at the S1P(3) receptor for a range of ligands. These differences could indicate the presence of functional selectivity at this receptor as FTY720-P and the VPC compounds seemed to signal predominantly via G(i)- whereas S1P activated G(i) and G(q)-coupled pathways.
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Affiliation(s)
- M Jongsma
- Department of Pharmacology & Pharmacotherapy, Academic Medical Center, Amsterdam, The Netherlands
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Affiliation(s)
- Astrid E Alewijnse
- Pharmacology & PharmacotherapyAcademic Medical CenterAmsterdamNetherlands
| | - Maikel Jongsma
- Pharmacology & PharmacotherapyAcademic Medical CenterAmsterdamNetherlands
| | - Marie‐Jeanne Mathy
- Pharmacology & PharmacotherapyAcademic Medical CenterAmsterdamNetherlands
| | - Pieter B Loenen
- Pharmacology & PharmacotherapyAcademic Medical CenterAmsterdamNetherlands
| | - Najat Hajji
- Pharmacology & PharmacotherapyAcademic Medical CenterAmsterdamNetherlands
| | - Martin C Michel
- Pharmacology & PharmacotherapyAcademic Medical CenterAmsterdamNetherlands
| | - Stephan L Peters
- Pharmacology & PharmacotherapyAcademic Medical CenterAmsterdamNetherlands
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Jongsma M, Florczyk UM, Hendriks-Balk MC, Michel MC, Peters SLM, Alewijnse AE. Validation of a rapid, non-radioactive method to quantify internalisation of G-protein coupled receptors. Naunyn Schmiedebergs Arch Pharmacol 2007; 375:329-36. [PMID: 17497135 PMCID: PMC1915601 DOI: 10.1007/s00210-007-0164-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2007] [Accepted: 04/13/2007] [Indexed: 11/18/2022]
Abstract
Agonist exposure can cause internalisation of G-protein coupled receptors (GPCRs), which may be a part of desensitisation but also of cellular signaling. Previous methods to study internalisation have been tedious or only poorly quantitative. Therefore, we have developed and validated a quantitative method using a sphingosine-1-phosphate (S1P) receptor as a model. Because of a lack of suitable binding studies, it has been difficult to study S1P receptor internalisation. Using a N-terminal HisG-tag, S1P1 receptors on the cell membrane can be visualised via immunocytochemistry with a specific anti-HisG antibody. S1P-induced internalisation was concentration dependent and was quantified using a microplate reader, detecting either absorbance, a fluorescent or luminescent signal, depending on the antibodies used. Among those, the fluorescence detection method was the most convenient to use. The relative ease of this method makes it suitable to measure a large number of data points, e.g. to compare the potency and efficacy of receptor ligands.
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Affiliation(s)
- Maikel Jongsma
- Department of Pharmacology and Pharmacotherapy, Academic Medical Center, Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands
| | - Urszula M. Florczyk
- Department of Pharmacology and Pharmacotherapy, Academic Medical Center, Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands
| | - Mariëlle C. Hendriks-Balk
- Department of Pharmacology and Pharmacotherapy, Academic Medical Center, Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands
| | - Martin C. Michel
- Department of Pharmacology and Pharmacotherapy, Academic Medical Center, Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands
| | - Stephan L. M. Peters
- Department of Pharmacology and Pharmacotherapy, Academic Medical Center, Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands
| | - Astrid E. Alewijnse
- Department of Pharmacology and Pharmacotherapy, Academic Medical Center, Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands
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Abstract
UNLABELLED The sphingomyelin metabolites ceramide, sphingosine 1-phosphate (S1P) and sphingosylphosphorylcholine (SPC) are emerging modulators of vascular tone. While ceramide appears to act primarily intracellularly, S1P and SPC appear to mainly work via specific receptors, although those for SPC have not yet been defined unequivocally. Each of the sphingomyelin metabolites can induce both vasoconstriction and vasodilatation and, in some cases--ceramide on the one hand, and S1P and SPC on the other hand--have opposite effects on vascular tone. The differences in effects between vessels may relate to the relative roles of endothelial and smooth muscle cells in mediating them, as well as to the distinct expression patterns of S1P receptors among vascular beds and among endothelial and smooth muscle cells. Recent evidence suggests that vascular tone is not only modulated by sphingomyelin metabolites which are exogenously added or reach the vessel wall via the bloodstream but also by those formed locally by cells in the vessel wall. Such local formation can be induced by known vasoactive agents such as angiotensin II and may serve a signalling function. CONCLUSION We conclude that sphingomyelin metabolites are important endogenous modulators of vascular function, which may contribute to the pathophysiology of some diseases and be targets for therapeutic interventions.
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Affiliation(s)
- Martin C Michel
- Department of Pharmacology & Pharmacotherapy, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
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Jongsma M, Hendriks-Balk MC, Michel MC, Peters SLM, Alewijnse AE. BML-241 fails to display selective antagonism at the sphingosine-1-phosphate receptor, S1P(3). Br J Pharmacol 2006; 149:277-82. [PMID: 16940990 PMCID: PMC2014271 DOI: 10.1038/sj.bjp.0706872] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND AND PURPOSE The thiazolidine carboxylic acid, BML-241, has been proposed as a lead compound in development of selective antagonists at the sphingosine-1-phosphate receptor (S1P3), based on its inhibition of the rise in intracellular calcium concentrations ([Ca2+]i) in HeLa cells overexpressing S1P receptors. We have studied the antagonistic properties of BML-241 for the S1P(3) receptor in more detail. EXPERIMENTAL APPROACH Chinese hamster ovary (CHO) cells stably transfected with the S1P3, S1P2 or alpha(1A)-adrenoceptors were used to investigate the effect of BML-241 on increases in [Ca2+]i mediated via different receptors. CHO-K1 cells were used to study ATP-induced [Ca2+]i elevations. Effects on S1P3 -mediated inhibition of forskolin-induced cAMP accumulation and on binding to alpha(1A)-adrenoceptors were also investigated. In addition, the effect of BML-241 on contractions of rat mesenteric artery induced by phenylephrine was studied in an organ bath. KEY RESULTS High concentrations of BML-241 (10 microM) inhibited the rise in [Ca2+]i induced by S1P3 and S1P2 receptor stimulation; lower concentrations were ineffective. This high concentration of BML-241 also inhibited [Ca2+]i increases via P2 (nucleotide) receptor or alpha(1A)-adrenoceptor stimulation. Moreover, BML-241 (10 microM) inhibited alpha(1)-adrenoceptor-mediated contraction of rat mesenteric artery but did not displace [3H]-prazosin from alpha(1A)-adrenoceptors in concentrations up to 100 microM. BML-241 (10 microM) did not affect the S1P3 -mediated decrease of forskolin-induced cAMP accumulation. CONCLUSIONS AND IMPLICATIONS We conclude that BML-241 is a low potency, non-selective inhibitor of increases in [Ca2+]i, rather than a specific antagonist at the S1P3 receptor.
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Affiliation(s)
- M Jongsma
- Department of Pharmacology & Pharmacotherapy, Academic Medical Center, University of Amsterdam Amsterdam, The Netherlands
| | - M C Hendriks-Balk
- Department of Pharmacology & Pharmacotherapy, Academic Medical Center, University of Amsterdam Amsterdam, The Netherlands
| | - M C Michel
- Department of Pharmacology & Pharmacotherapy, Academic Medical Center, University of Amsterdam Amsterdam, The Netherlands
| | - S L M Peters
- Department of Pharmacology & Pharmacotherapy, Academic Medical Center, University of Amsterdam Amsterdam, The Netherlands
| | - A E Alewijnse
- Department of Pharmacology & Pharmacotherapy, Academic Medical Center, University of Amsterdam Amsterdam, The Netherlands
- Author for correspondence:
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Abstract
Potato proteinase inhibitor II (PI-2) is composed of two sequence repeats. It contains two reactive site domains. We developed an improved protocol for the production of PI-2 using the yeast Pichia pastoris as the expression host. We then assessed the role of its two reactive sites in the inhibition of trypsin and chymotrypsin by mutating each of the two reactive sites in various ways. From these studies it appears that the second reactive site strongly inhibits both trypsin (Ki = 0.4 nM) and chymotrypsin (Ki = 0.9 nM), and is quite robust towards mutations at positions P2 or P1'. In contrast, the first reactive site inhibits only chymotrypsin (Ki = 2 nM), and this activity is very sensitive to mutations. Remarkably, replacing the reactive site amino acids of domain I with those of domain II did not result in inhibitory activities similar to domain II. The fitness for protein engineering of each domain is discussed.
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Affiliation(s)
- J Beekwilder
- Department of Molecular Biology, Center for Plant Breeding and Reproduction Research (CPRO), Wageningen, the Netherlands.
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Abstract
Phage display is a powerful tool with which to adapt the specificity of protease inhibitors. To this end, a library of variants of the potato protease inhibitor PI2 was introduced in a canonical phagemid vector. Although PI2 is a natural trypsin inhibitor, we were unable to select trypsin-binding variants from the library. Instead, only mutants carrying deletions or amber stop codons were found. Bacteria carrying these mutations had a much faster growth rate than those carrying the wt PI2-encoding gene, even when the promoter was repressed. To overcome these problems, two new phagemid vectors for g3-mediated phage display were constructed. The first vector has a lower plasmid copy number, as compared to the canonical vector. Bacteria harboring this new vector are much less affected by the presence of the PI2-g3 fusion gene, which appears from a markedly reduced growth retardation. A second vector was equipped with the promoter of the Escherichia coli psp operon, instead of the lac promoter, to control the PI2-g3 gene fusion expression. The psp promoter is induced upon helper phage infection. A phagemid vector with this promoter controlling a PI2-g3 gene fusion did not affect the viability of the host. Furthermore, both new vectors were shown to produce phage particles that display the inhibitor protein and were therefore considered suitable for phage display. The inhibitor library was introduced in both new vectors. Trypsin-binding phages with inhibitory sequences were selected, instead of sequences with stop codons or deletions. This demonstrates the usefulness of these new vectors for phage display of proteins that affect the viability of E. coli.
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Affiliation(s)
- J Beekwilder
- Centre for Plant Breeding and Reproduction, Wageningen, The Netherlands. /nl
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Jongsma M, Koornneef M, Zabel P, Hille J. Tomato protoplast DNA transformation: physical linkage and recombination of exogenous DNA sequences. Plant Mol Biol 1987; 8:383-394. [PMID: 24301260 DOI: 10.1007/bf00015816] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/1986] [Revised: 01/20/1987] [Accepted: 01/27/1987] [Indexed: 06/02/2023]
Abstract
Tomato protoplasts have been transformed with plasmid DNA's, containing a chimeric kanamycin resistance gene and putative tomato origins of replication. A calcium phosphate-DNA mediated transformation procedure was employed in combination with either polyethylene glycol or polyvinyl alcohol. There were no indications that the tomato DNA inserts conferred autonomous replication on the plasmids. Instead, Southern blot hybridization analysis of seven kanamycin resistant calli revealed the presence of at least one kanamycin resistance locus per transformant integrated in the tomato nuclear DNA. Generally one to three truncated plasmid copies were found integrated into the tomato nuclear DNA, often physically linked to each other. For one transformant we have been able to use the bacterial ampicillin resistance marker of the vector plasmid pUC9 to 'rescue' a recombinant plasmid from the tomato genome. Analysis of the foreign sequences included in the rescued plasmid showed that integration had occurred in a non-repetitive DNA region. Calf-thymus DNA, used as a carrier in transformation procedure, was found to be covalently linked to plasmid DNA sequences in the genomic DNA of one transformant. A model is presented describing the fate of exogenously added DNA during the transformation of a plant cell. The results are discussed in reference to the possibility of isolating DNA sequences responsible for autonomous replication in tomato.
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Affiliation(s)
- M Jongsma
- Agricultural University, De Dreijen 11, 6703 BC, Wageningen
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