1
|
Sheng L, Leshchyns'ka I, Sytnyk V. Neural Cell Adhesion Molecule 2 (NCAM2)-Induced c-Src-Dependent Propagation of Submembrane Ca2+ Spikes Along Dendrites Inhibits Synapse Maturation. Cereb Cortex 2020. [PMID: 29522129 DOI: 10.1093/cercor/bhy041] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The neural cell adhesion molecule 2 (NCAM2) is encoded by a gene on chromosome 21 in humans. NCAM2 accumulates in synapses, but its role in regulation of synapse formation remains poorly understood. We demonstrate that an increase in NCAM2 levels results in increased instability of dendritic protrusions and reduced conversion of protrusions to dendritic spines in mouse cortical neurons. NCAM2 overexpression induces an increase in the frequency of submembrane Ca2+ spikes localized in individual dendritic protrusions and promotes propagation of submembrane Ca2+ spikes over segments of dendrites or the whole dendritic tree. NCAM2-dependent submembrane Ca2+ spikes are L-type voltage-gated Ca2+ channel-dependent, and their propagation but not initiation depends on the c-Src protein tyrosine kinase. Inhibition of initiation or propagation of NCAM2-dependent submembrane Ca2+ spikes reduces the NCAM2-dependent instability of dendritic protrusions. Synaptic boutons formed on dendrites of neurons with elevated NCAM2 expression are enriched in the protein marker of immature synapses GAP43, and the number of boutons with mature activity-dependent synaptic vesicle recycling is reduced. Our results indicate that synapse maturation is inhibited in NCAM2-overexpressing neurons and suggest that changes in NCAM2 levels and altered submembrane Ca2+ dynamics can cause defects in synapse maturation in Down syndrome and other brain disorders associated with abnormal NCAM2 expression.
Collapse
Affiliation(s)
- Lifu Sheng
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, New South Wales, Australia
| | - Iryna Leshchyns'ka
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, New South Wales, Australia
| | - Vladimir Sytnyk
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, New South Wales, Australia
| |
Collapse
|
2
|
Balion Z, Cėpla V, Svirskiene N, Svirskis G, Druceikaitė K, Inokaitis H, Rusteikaitė J, Masilionis I, Stankevičienė G, Jelinskas T, Ulčinas A, Samanta A, Valiokas R, Jekabsone A. Cerebellar Cells Self-Assemble into Functional Organoids on Synthetic, Chemically Crosslinked ECM-Mimicking Peptide Hydrogels. Biomolecules 2020; 10:E754. [PMID: 32408703 PMCID: PMC7277677 DOI: 10.3390/biom10050754] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 04/28/2020] [Accepted: 05/02/2020] [Indexed: 12/12/2022] Open
Abstract
Hydrogel-supported neural cell cultures are more in vivo-relevant compared to monolayers formed on glass or plastic substrates. However, there is a lack of synthetic microenvironment available for obtaining standardized and easily reproducible cultures characterized by tissue-mimicking cell composition, cell-cell interactions, and functional networks. Synthetic peptides representing the biological properties of the extracellular matrix (ECM) proteins have been reported to promote the adhesion-driven differentiation and functional maturation of neural cells. Thus, such peptides can serve as building blocks for engineering a standardized, all-synthetic environment. In this study, we have compared the effect of two chemically crosslinked hydrogel compositions on primary cerebellar cells: collagen-like peptide (CLP), and CLP with an integrin-binding motif arginine-glycine-aspartate (CLP-RGD), both conjugated to polyethylene glycol molecular templates (PEG-CLP and PEG-CLP-RGD, respectively) and fabricated as self-supporting membranes. Both compositions promoted a spontaneous organization of primary cerebellar cells into tissue-like clusters with fast-rising Ca2+ signals in soma, reflecting action potential generation. Notably, neurons on PEG-CLP-RGD had more neurites and better synaptic efficiency compared to PEG-CLP. For comparison, poly-L-lysine-coated glass and plastic surfaces did not induce formation of such spontaneously active networks. Additionally, contrary to the hydrogel membranes, glass substrates functionalized with PEG-CLP and PEG-CLP-RGD did not sufficiently support cell attachment and, subsequently, did not promote functional cluster formation. These results indicate that not only chemical composition but also the hydrogel structure and viscoelasticity are essential for bioactive signaling. The synthetic strategy based on ECM-mimicking, multifunctional blocks in registry with chemical crosslinking for obtaining tissue-like mechanical properties is promising for the development of fast and well standardized functional in vitro neural models and new regenerative therapies.
Collapse
Affiliation(s)
- Zbigniev Balion
- Institute of Pharmaceutical Technologies, Lithuanian University of Health Sciences, Sukilėlių ave. 13, LT-50162 Kaunas, Lithuania; (Z.B.); (J.R.)
- Neuroscience Institute, Lithuanian University of Health Sciences, Eivenių str. 4, LT-50161 Kaunas, Lithuania; (N.S.); (G.S.)
| | - Vytautas Cėpla
- Ferentis UAB, Savanorių 231, LT-02300 Vilnius, Lithuania; (V.C.); (K.D.); (I.M.); (G.S.); (T.J.); (R.V.)
- Department of Nanoengineering, Center for Physical Sciences and Technology, Savanorių 231, LT-02300 Vilnius, Lithuania;
| | - Nataša Svirskiene
- Neuroscience Institute, Lithuanian University of Health Sciences, Eivenių str. 4, LT-50161 Kaunas, Lithuania; (N.S.); (G.S.)
| | - Gytis Svirskis
- Neuroscience Institute, Lithuanian University of Health Sciences, Eivenių str. 4, LT-50161 Kaunas, Lithuania; (N.S.); (G.S.)
| | - Kristina Druceikaitė
- Ferentis UAB, Savanorių 231, LT-02300 Vilnius, Lithuania; (V.C.); (K.D.); (I.M.); (G.S.); (T.J.); (R.V.)
| | - Hermanas Inokaitis
- Institute of Anatomy, Lithuanian University of Health Sciences, Mickeviciaus 9, LT-43074 Kaunas, Lithuania;
| | - Justina Rusteikaitė
- Institute of Pharmaceutical Technologies, Lithuanian University of Health Sciences, Sukilėlių ave. 13, LT-50162 Kaunas, Lithuania; (Z.B.); (J.R.)
| | - Ignas Masilionis
- Ferentis UAB, Savanorių 231, LT-02300 Vilnius, Lithuania; (V.C.); (K.D.); (I.M.); (G.S.); (T.J.); (R.V.)
| | - Gintarė Stankevičienė
- Ferentis UAB, Savanorių 231, LT-02300 Vilnius, Lithuania; (V.C.); (K.D.); (I.M.); (G.S.); (T.J.); (R.V.)
- Department of Nanoengineering, Center for Physical Sciences and Technology, Savanorių 231, LT-02300 Vilnius, Lithuania;
| | - Tadas Jelinskas
- Ferentis UAB, Savanorių 231, LT-02300 Vilnius, Lithuania; (V.C.); (K.D.); (I.M.); (G.S.); (T.J.); (R.V.)
| | - Artūras Ulčinas
- Department of Nanoengineering, Center for Physical Sciences and Technology, Savanorių 231, LT-02300 Vilnius, Lithuania;
| | - Ayan Samanta
- Polymer Chemistry, Department of Chemistry - Ångström Laboratory, Uppsala University, Box 538, 75121 Uppsala, Sweden;
| | - Ramūnas Valiokas
- Ferentis UAB, Savanorių 231, LT-02300 Vilnius, Lithuania; (V.C.); (K.D.); (I.M.); (G.S.); (T.J.); (R.V.)
- Department of Nanoengineering, Center for Physical Sciences and Technology, Savanorių 231, LT-02300 Vilnius, Lithuania;
| | - Aistė Jekabsone
- Institute of Pharmaceutical Technologies, Lithuanian University of Health Sciences, Sukilėlių ave. 13, LT-50162 Kaunas, Lithuania; (Z.B.); (J.R.)
- Neuroscience Institute, Lithuanian University of Health Sciences, Eivenių str. 4, LT-50161 Kaunas, Lithuania; (N.S.); (G.S.)
| |
Collapse
|