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Acrylamide alters CREB and retinoic acid signaling pathways during differentiation of the human neuroblastoma SH-SY5Y cell line
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.ORCID iD: 0000-0002-6611-0785
Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute.ORCID iD: 0000-0001-9225-3264
Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Acrylamide is a known neurotoxic compound that we get exposed to through food and through the environment. It can cross the placental barrier as well as the blood-brain barrier resulting in exposure of the fetus and the infant child. We used the human neuroblastoma cell line SH-SY5Y to study the effects of non-cytotoxic acrylamide exposure during 9 days of differentiation on two differentially important signaling pathways, i.e. the retinoic acid receptor (RAR) and cAMP response element-binding protein (CREB) signaling in neurons. Our results showed that exposure of non-cytotoxic concentrations of acrylamide during 9 days of differentiation induced altered expression of multiple genes that are part of the CREB and RAR activation pathways, e.g. cellular retinoic acid binding protein 1, retinol binding protein 7, CREB5 and fibroblast growth factor receptor 2. Other well-established neuronal markers such as brain-derived neurotrophic factor, syntaxin binding protein 2, transforming growth factor beta 1, the dopaminergic markers monoamine oxidase A and dopamine receptor D2 as wells as the cholinergic marker choline O-acetyltransferase were also significantly altered by acrylamide. Our results reveal that acrylamide interferes with crucial pathways involved in neuronal differentiation in vitro and raise concerns over the potential toxic outcomes in humans.

National Category
Biochemistry and Molecular Biology
Research subject
Neurochemistry with Molecular Neurobiology
Identifiers
URN: urn:nbn:se:su:diva-168195OAI: oai:DiVA.org:su-168195DiVA, id: diva2:1306697
Available from: 2019-04-24 Created: 2019-04-24 Last updated: 2019-05-02Bibliographically approved
In thesis
1. Cell models for evaluation of adult and developmental neurotoxicity: Focus on acrylamide
Open this publication in new window or tab >>Cell models for evaluation of adult and developmental neurotoxicity: Focus on acrylamide
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is aimed at summarizing some of the alternative in vitro methods and models that have been used to study both adult and developmental neurotoxicity (DNT), and also to pinpoint some of the important aspects of using alternative in vitro methods. The aim of the papers included in this thesis was to challenge the hypothesis that neurotoxicity and DNT of chemicals can be studied using robust endpoints for proliferation and neural differentiation, such as neurite outgrowth, mRNA expression and protein expression, in two different cell lines. The aim was also to characterize the two cell lines and identify marker genes important for differentiation and to evaluate if these markers could be used as indicators for DNT. The hypothesis being that any chemical that change the expression of important genes for the developmental process could possibly result in DNT for the cells. The current developmental neurotoxicity testing guidelines, using animal models, are time consuming, expensive, ethically questionable and have relatively low sensitivity. Because of this, there has been a paradigm shift towards developing and using alternative methods capable of testing and screening large number of substances. The next generation of developmental neurotoxicity testing is predicted to consist of both in silico and in vitro testing that have to be used in a combined fashion so that it will generate a more rapid and efficient toxicity testing. The idea is to use a battery of refined endpoint studies that identify the specific toxicity of a compound, discriminate between different neural subpopulations and the different stages of neural differentiation. The use of transcriptomic approaches has been suggested as an example of such an endpoint. In this thesis we have evaluated the human neuroblastoma cell line SH-SY5Y and the murine neural progenitor cell line C17.2 in their ability to detect neurotoxic and developmental neurotoxic compounds. We have evaluated this by using functional endpoints, such as neurite outgrowth, cell membrane potential and phenotype ratios. We have also studied the effect of selected chemicals on the levels of mRNA markers specific for different neural cell populations or for neural differentiation in general. We have performed whole genome gene expression on the two cell lines during differentiation and identified and selected a limited number of genes that have been evaluated for their ability to detect developmental neurotoxicity. Both cell lines showed that they have the capability to identify neurotoxic and developmental neurotoxic compounds and could possibly serve as an addition to the testing battery of neurotoxicity in the future. Some of the focus of this thesis has been directed towards the neurodevelopmental effects of the neurotoxic compound acrylamide. Most people get exposed to acrylamide through food consumption and from environmental pollution. Since acrylamide crosses the placental barrier, it creates a risk for developmental consequences. We found that acrylamide affected both cell proliferation and differentiation in both cell lines. Acrylamide affected both neuronal and the glial phenotypes in the C17.2 cell line. We also revealed that acrylamide attenuated neural differentiation at concentrations that were seven orders of magnitude lower than the estimated plasma concentration of free acrylamide in the fetus. Low concentrations of acrylamide altered the gene expression of several genes involved in the retinoic acid signaling as well as the CREB signaling pathways during retinoic acid driven differentiation in the SH-SY5Y cells. Since sub-micromolar concentrations seem to inhibit the differentiation process in both cell lines, developmental neurotoxicity induced by daily intake of acrylamide is a matter of concern. We found that the C17.2 cell line could function as a good model for detecting acute neurotoxicity by evaluating the cell membrane potential of the cells in combination with gene expression of neural and stress marker genes.

Place, publisher, year, edition, pages
Stockholm: Department of Biochemistry and Biophysics, Stockholm University, 2019. p. 77
National Category
Biochemistry and Molecular Biology
Research subject
Neurochemistry with Molecular Neurobiology
Identifiers
urn:nbn:se:su:diva-168196 (URN)978-91-7797-642-4 (ISBN)978-91-7797-643-1 (ISBN)
Public defence
2019-06-14, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 10:00 (English)
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Supervisors
Note

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 3: Manuscript.

Available from: 2019-05-22 Created: 2019-04-24 Last updated: 2019-06-17Bibliographically approved

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Attoff, KristinaÖstlund Farrants, Ann-KristinJohansson, YlvaLundqvist, JessicaForsby, Anna
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