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Expression and secretion of synaptic proteins during stem cell differentiation to cortical neurons.

Journal article
Authors Faisal Hayat Nazir
Bruno Becker
Ann Brinkmalm
Kina Höglund
Åsa P Sandelius
Petra Bergström
Tugce Munise Satir
Annika Öhrfelt
Kaj Blennow
Lotta Agholme
Henrik Zetterberg
Published in Neurochemistry international
Volume 121
Pages 38-49
ISSN 1872-9754
Publication year 2018
Published at Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry
Pages 38-49
Language en
Links dx.doi.org/10.1016/j.neuint.2018.10...
www.ncbi.nlm.nih.gov/entrez/query.f...
Subject categories Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy), Neurobiology, Neuroscience, Neurochemistry, Medical cell biology

Abstract

Synaptic function and neurotransmitter release are regulated by specific proteins. Cortical neuronal differentiation of human induced pluripotent stem cells (hiPSC) provides an experimental model to obtain more information about synaptic development and physiology in vitro. In this study, expression and secretion of the synaptic proteins, neurogranin (NRGN), growth-associated protein-43 (GAP-43), synaptosomal-associated protein-25 (SNAP-25) and synaptotagmin-1 (SYT-1) were analyzed during cortical neuronal differentiation. Protein levels were measured in cells, modeling fetal cortical development and in cell-conditioned media which was used as a model of cerebrospinal fluid (CSF), respectively. Human iPSC-derived cortical neurons were maintained over a period of at least 150 days, which encompasses the different stages of neuronal development. The differentiation was divided into the following stages: hiPSC, neuro-progenitors, immature and mature cortical neurons. We show that NRGN was first expressed and secreted by neuro-progenitors while the maximum was reached in mature cortical neurons. GAP-43 was expressed and secreted first by neuro-progenitors and its expression increased markedly in immature cortical neurons. SYT-1 was expressed and secreted already by hiPSC but its expression and secretion peaked in mature neurons. SNAP-25 was first detected in neuro-progenitors and the expression and secretion increased gradually during neuronal stages reaching a maximum in mature neurons. The sensitive analytical techniques used to monitor the secretion of these synaptic proteins during cortical development make these data unique, since the secretion of these synaptic proteins has not been investigated before in such experimental models. The secretory profile of synaptic proteins, together with low release of intracellular content, implies that mature neurons actively secrete these synaptic proteins that previously have been associated with neurodegenerative disorders, including Alzheimer's disease. These data support further studies of human neuronal and synaptic development in vitro, and would potentially shed light on the mechanisms underlying altered concentrations of the proteins in bio-fluids in neurodegenerative diseases.

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