1
|
Velásquez ZD, Rojas-Barón L, Larrazabal C, Salierno M, Gärtner U, Pervizaj-Oruqaj L, Herold S, Hermosilla C, Taubert A. Corrigendum: Neospora caninum infection triggers S-phase arrest and alters nuclear characteristics in primary bovine endothelial host cells. Front Cell Dev Biol 2022; 10:1025995. [PMID: 36204683 PMCID: PMC9531571 DOI: 10.3389/fcell.2022.1025995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 08/24/2022] [Indexed: 12/02/2022] Open
Affiliation(s)
- Zahady D. Velásquez
- Institute of Parasitology, Biomedical Research Center Seltersberg, Justus Liebig University Giessen, Giessen, Germany
- *Correspondence: Zahady D. Velásquez,
| | - Lisbeth Rojas-Barón
- Institute of Parasitology, Biomedical Research Center Seltersberg, Justus Liebig University Giessen, Giessen, Germany
| | - Camilo Larrazabal
- Institute of Parasitology, Biomedical Research Center Seltersberg, Justus Liebig University Giessen, Giessen, Germany
| | - Marcelo Salierno
- Centre for Developmental Neurobiology, MRC Centre for Neurodevelopmental Disorders, King’s College London, London, United Kingdom
| | - Ulrich Gärtner
- Institute of Anatomy and Cell Biology, Justus Liebig University Giessen, Giessen, Germany
| | - Learta Pervizaj-Oruqaj
- Department of Medicine V Internal Medicine Infectious Diseases and Infection Control Universities of Giessen and Marburg Lung Center (UGMLC) Member of the German Center for Lung Research (DZL) Justus-Liebig University Giessen, Giessen, Germany
- Institute for Lung Health (ILH), Giessen, Germany
- Excellence Cluster Cardipulmonary Institute (CPI), Giessen, Germany
| | - Susanne Herold
- Department of Medicine V Internal Medicine Infectious Diseases and Infection Control Universities of Giessen and Marburg Lung Center (UGMLC) Member of the German Center for Lung Research (DZL) Justus-Liebig University Giessen, Giessen, Germany
- Institute for Lung Health (ILH), Giessen, Germany
- Excellence Cluster Cardipulmonary Institute (CPI), Giessen, Germany
| | - Carlos Hermosilla
- Institute of Parasitology, Biomedical Research Center Seltersberg, Justus Liebig University Giessen, Giessen, Germany
| | - Anja Taubert
- Institute of Parasitology, Biomedical Research Center Seltersberg, Justus Liebig University Giessen, Giessen, Germany
| |
Collapse
|
2
|
Velásquez ZD, Rojas-Barón L, Larrazabal C, Salierno M, Gärtner U, Pervizaj-Oruqaj L, Herold S, Hermosilla C, Taubert A. Neospora caninum Infection Triggers S-phase Arrest and Alters Nuclear Characteristics in Primary Bovine Endothelial Host Cells. Front Cell Dev Biol 2022; 10:946335. [PMID: 36111335 PMCID: PMC9469085 DOI: 10.3389/fcell.2022.946335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 05/17/2022] [Accepted: 06/23/2022] [Indexed: 11/30/2022] Open
Abstract
Neospora caninum represents a major cause of abortive disease in bovines and small ruminants worldwide. As a typical obligate intracellular apicomplexan parasite, N. caninum needs to modulate its host cell for successful replication. In the current study, we focused on parasite-driven interference with host cell cycle progression. By performing DNA content-based cell cycle phase analyses in N. caninum-infected primary bovine umbilical vein endothelial cells (BUVEC), a parasite-driven S-phase arrest was detected at both 24 and 32 h p. i., being paralleled by fewer host cells experiencing the G0/G1 cell cycle phase. When analyzing S-subphases, proliferation cell nuclear antigen (per PCNA)-based experiments showed a reduced population of BUVEC in the late S-phase. Analyses on key molecules of cell cycle regulation documented a significant alteration of cyclin A2 and cyclin B1 abundance in N. caninum-infected host endothelial cells, thereby confirming irregularities in the S-phase and S-to-G2/M-phase transition. In line with cell cycle alterations, general nuclear parameters revealed smaller nuclear sizes and morphological abnormalities of BUVEC nuclei within the N. caninum-infected host cell layer. The latter observations were also confirmed by transmission electron microscopy (TEM) and by analyses of lamin B1 as a marker of nuclear lamina, which illustrated an inhomogeneous nuclear lamin B1 distribution, nuclear foldings, and invaginations, thereby reflecting nuclear misshaping. Interestingly, the latter finding applied to both non-infected and infected host cells within parasitized BUVEC layer. Additionally, actin detection indicated alterations in the perinuclear actin cap formation since typical nucleo-transversal filaments were consistently lacking in N. caninum-infected BUVEC, as also documented by significantly decreased actin-related intensities in the perinuclear region. These data indicate that N. caninum indeed alters host cell cycle progression and severely affects the host cell nuclear phenotype in primary bovine endothelial host cells. In summary, these findings add novel data on the complex N. caninum-specific modulation of host cell and nucleus, thereby demonstrating clear differences in cell cycle progression modulation driven by other closely related apicomplexans like Toxoplasma gondii and Besnotia besnoiti.
Collapse
Affiliation(s)
- Zahady D. Velásquez
- Institute of Parasitology, Biomedical Research Center Seltersberg, Justus Liebig University Giessen, Giessen, Germany
- *Correspondence: Zahady D. Velásquez,
| | - Lisbeth Rojas-Barón
- Institute of Parasitology, Biomedical Research Center Seltersberg, Justus Liebig University Giessen, Giessen, Germany
| | - Camilo Larrazabal
- Institute of Parasitology, Biomedical Research Center Seltersberg, Justus Liebig University Giessen, Giessen, Germany
| | - Marcelo Salierno
- Centre for Developmental Neurobiology, MRC Centre for Neurodevelopmental Disorders, King’s College London, London, United Kingdom
| | - Ulrich Gärtner
- Institute of Anatomy and Cell Biology, Justus Liebig University Giessen, Giessen, Germany
| | - Learta Pervizaj-Oruqaj
- Department of Medicine V Internal Medicine Infectious Diseases and Infection Control Universities of Giessen and Marburg Lung Center (UGMLC) Member of the German Center for Lung Research (DZL) Justus-Liebig University Giessen, Giessen, Germany
- Institute for Lung Health (ILH), Giessen, Germany
- Excellence Cluster Cardipulmonary Institute (CPI), Giessen, Germany
| | - Susanne Herold
- Department of Medicine V Internal Medicine Infectious Diseases and Infection Control Universities of Giessen and Marburg Lung Center (UGMLC) Member of the German Center for Lung Research (DZL) Justus-Liebig University Giessen, Giessen, Germany
- Institute for Lung Health (ILH), Giessen, Germany
- Excellence Cluster Cardipulmonary Institute (CPI), Giessen, Germany
| | - Carlos Hermosilla
- Institute of Parasitology, Biomedical Research Center Seltersberg, Justus Liebig University Giessen, Giessen, Germany
| | - Anja Taubert
- Institute of Parasitology, Biomedical Research Center Seltersberg, Justus Liebig University Giessen, Giessen, Germany
| |
Collapse
|
3
|
Ramos SI, Makeyev EV, Salierno M, Kodama T, Kawakami Y, Sahara S. Tuba8 Drives Differentiation of Cortical Radial Glia into Apical Intermediate Progenitors by Tuning Modifications of Tubulin C Termini. Dev Cell 2020; 52:477-491.e8. [PMID: 32097653 DOI: 10.1016/j.devcel.2020.01.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 09/11/2019] [Accepted: 01/28/2020] [Indexed: 12/20/2022]
Abstract
Most adult neurons and glia originate from radial glial progenitors (RGs), a type of stem cell typically extending from the apical to the basal side of the developing cortex. Precise regulation of the choice between RG self-renewal and differentiation is critical for normal development, but the mechanisms underlying this transition remain elusive. We show that the non-canonical tubulin Tuba8, transiently expressed in cortical progenitors, drives differentiation of RGs into apical intermediate progenitors, a more restricted progenitor type lacking attachment to the basal lamina. This effect depends on the unique C-terminal sequence of Tuba8 that antagonizes tubulin tyrosination and Δ2 cleavage, two post-translational modifications (PTMs) essential for RG fiber maintenance and the switch between direct and indirect neurogenesis and ultimately distinct neuronal lineage outcomes. Our work uncovers an instructive role of a developmentally regulated tubulin isotype in progenitor differentiation and provides new insights into biological functions of the cellular tubulin PTM "code."
Collapse
Affiliation(s)
- Susana I Ramos
- Centre for Developmental Neurobiology, King's College London, New Hunt's House, Guy's Campus, London SE1 1UL, UK
| | - Eugene V Makeyev
- Centre for Developmental Neurobiology, King's College London, New Hunt's House, Guy's Campus, London SE1 1UL, UK
| | - Marcelo Salierno
- Centre for Developmental Neurobiology, King's College London, New Hunt's House, Guy's Campus, London SE1 1UL, UK
| | - Takashi Kodama
- Department of Otolaryngology-Head and Neck Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Yasuhiko Kawakami
- Department of Genetics, Cell Biology and Development, Stem Cell Institute, Developmental Biology Center, University of Minnesota, Minneapolis, MN 55455, USA
| | - Setsuko Sahara
- Centre for Developmental Neurobiology, King's College London, New Hunt's House, Guy's Campus, London SE1 1UL, UK; MRC Centre for Neurodevelopmental Disorders, King's College London, New Hunt's House, Guy's Campus, London SE1 1UL, UK.
| |
Collapse
|
4
|
Spinedi N, Rojas N, Storb R, Cabrera J, Aranda E, Salierno M, Svriz M, Scervino JM. Exploring the response of Marchantia polymorpha: Growth, morphology and chlorophyll content in the presence of anthracene. Plant Physiol Biochem 2019; 135:570-574. [PMID: 30429053 DOI: 10.1016/j.plaphy.2018.11.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 10/25/2018] [Accepted: 11/01/2018] [Indexed: 06/09/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) were identified as hazardous contaminants that are ubiquitous and persistent in aquatic environments, where bryophytes sensu lato (mosses, liverworts and hornworts) are frequently present. Marchantia polymorpha (Class Hepaticae; thalloid liverwort) is known to respond fast to changes in the environment; it accumulates toxic substances in its tissues due to the lack of vascular and radicular systems and a reduced or absent cuticle. The objective of the present study was to quantify the effects of increasing concentrations of anthracene (0, 50 100, 280 μM) on the germination of propagules, plant morphology and chlorophyll content index (CCI) in M. polymorpha under in vitro cultures. The results show that anthracene had no statistical effect on germination or propagula formation. However, plants exposed to anthracene for 30 days showed significantly lowered the content of chlorophyll (measured as CCI), irregular growth patterns and the induction of thalli asexual reproduction as evidenced by the production of multicellular viable propagules in gemmae cups. Results of epifluorescence microscopy also showed concomitant accumulation of anthracene in the cell walls. All of these distinctive morphological and physiological adaptive responses indicators, clearly suggest that M. polymorpha are capable of resisting high (coal tar) anthracene concentrations.
Collapse
Affiliation(s)
- Nahuel Spinedi
- Instituto de Investigaciones en Biodiversidad y Medioambiente (INIBIOMA), CONICET-UNCo, San Carlos de Bariloche, Río Negro 8400, Argentina
| | - Nadia Rojas
- Instituto de Investigaciones en Biodiversidad y Medioambiente (INIBIOMA), CONICET-UNCo, San Carlos de Bariloche, Río Negro 8400, Argentina
| | - Romina Storb
- Instituto de Investigaciones en Biodiversidad y Medioambiente (INIBIOMA), CONICET-UNCo, San Carlos de Bariloche, Río Negro 8400, Argentina
| | - Juan Cabrera
- Instituto de Investigaciones en Biodiversidad y Medioambiente (INIBIOMA), CONICET-UNCo, San Carlos de Bariloche, Río Negro 8400, Argentina
| | - Elisabet Aranda
- Institute of Water Research, University of Granada, Ramón y Cajal, Fray Luís 4, Granada 18071, Spain
| | - Marcelo Salierno
- Instituto de Investigaciones en Biodiversidad y Medioambiente (INIBIOMA), CONICET-UNCo, San Carlos de Bariloche, Río Negro 8400, Argentina
| | - Maya Svriz
- Instituto de Investigaciones en Recursos Naturales, Agroecología y Desarrollo Rural (IRNAD), Universidad Nacional de Río Negro, CONICET, San Carlos de Bariloche, Río Negro 8400, Argentina
| | - José Martín Scervino
- Instituto de Investigaciones en Biodiversidad y Medioambiente (INIBIOMA), CONICET-UNCo, San Carlos de Bariloche, Río Negro 8400, Argentina.
| |
Collapse
|
5
|
Farrukh A, Zhao S, Paez JI, Kavyanifar A, Salierno M, Cavalié A, Del Campo A. In Situ, Light-Guided Axon Growth on Biomaterials via Photoactivatable Laminin Peptidomimetic IK(HANBP)VAV. ACS Appl Mater Interfaces 2018; 10:41129-41137. [PMID: 30387978 DOI: 10.1021/acsami.8b15517] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The ability to guide the growth of neurites is relevant for reconstructing neural networks and for nerve tissue regeneration. Here, a biofunctional hydrogel that allows light-based directional control of axon growth in situ is presented. The gel is covalently modified with a photoactivatable derivative of the short laminin peptidomimetic IKVAV. This adhesive peptide contains the photoremovable group 2-(4'-amino-4-nitro-[1,1'-biphenyl]-3-yl)propan-1-ol (HANBP) on the Lys rest that inhibits its activity. The modified peptide is highly soluble in water and can be simply conjugated to -COOH containing hydrogels via its terminal -NH2 group. Light exposure allows presentation of the IKVAV adhesive motif on a soft hydrogel at desired concentration and at defined position and time point. The photoactivated gel supports neurite outgrowth in embryonic neural progenitor cells culture and allows site-selective guidance of neurites extension. In situ exposure of cell cultures using a scanning laser allows outgrowth of neurites in desired pathways.
Collapse
Affiliation(s)
- Aleeza Farrukh
- INM-Leibniz Institute for New Materials , Campus D2 2 , 66123 Saarbrücken , Germany
- Max Planck Graduate Center , Forum Universitatis 2 , Building 1111, 55122 Mainz , Germany
| | - Shifang Zhao
- INM-Leibniz Institute for New Materials , Campus D2 2 , 66123 Saarbrücken , Germany
- Chemistry Department , Saarland University , 66123 Saarbrücken , Germany
| | - Julieta I Paez
- INM-Leibniz Institute for New Materials , Campus D2 2 , 66123 Saarbrücken , Germany
| | - Atria Kavyanifar
- Institute of Physiological Chemistry , University Medical Center Johannes Gutenberg University , Hanns-Dieter-Hüsch-Weg 19 , D-55128 Mainz , Germany
| | - Marcelo Salierno
- Institute of Physiological Chemistry , University Medical Center Johannes Gutenberg University , Hanns-Dieter-Hüsch-Weg 19 , D-55128 Mainz , Germany
| | - Adolfo Cavalié
- Experimental and Clinical Pharmacology and Toxicology , Saarland University , 66421 Homburg , Germany
| | - Aránzazu Del Campo
- INM-Leibniz Institute for New Materials , Campus D2 2 , 66123 Saarbrücken , Germany
- Chemistry Department , Saarland University , 66123 Saarbrücken , Germany
| |
Collapse
|
6
|
Farrukh A, Fan W, Zhao S, Salierno M, Paez JI, del Campo A. Cover Feature: Photoactivatable Adhesive Ligands for Light-Guided Neuronal Growth (ChemBioChem 12/2018). Chembiochem 2018. [DOI: 10.1002/cbic.201800283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Aleeza Farrukh
- INM-Leibniz Institute for New Materials; Campus D2 2 66123 Saarbrücken Germany
- Max Planck Graduate Center; Forum Universitatis 2; Building 1111 55122 Mainz Germany
| | - Wenqiang Fan
- Institute of Physiological Chemistry; University Medical Center Johannes Gutenberg; Hanns-Dieter-Hüsch-Weg 19 55128 Mainz Germany
| | - Shifang Zhao
- INM-Leibniz Institute for New Materials; Campus D2 2 66123 Saarbrücken Germany
- Saarland University; Chemistry Department; 66123 Saarbrücken Germany
| | - Marcelo Salierno
- Institute of Physiological Chemistry; University Medical Center Johannes Gutenberg; Hanns-Dieter-Hüsch-Weg 19 55128 Mainz Germany
- INIBIOMA; CRUB; Universidad Nacional del Comahue; Quintral 1250 8400 S.C. Bariloche Argentina
| | - Julieta I. Paez
- INM-Leibniz Institute for New Materials; Campus D2 2 66123 Saarbrücken Germany
| | - Aránzazu del Campo
- INM-Leibniz Institute for New Materials; Campus D2 2 66123 Saarbrücken Germany
- Saarland University; Chemistry Department; 66123 Saarbrücken Germany
| |
Collapse
|
7
|
Farrukh A, Fan W, Zhao S, Salierno M, Paez JI, Del Campo A. Photoactivatable Adhesive Ligands for Light-Guided Neuronal Growth. Chembiochem 2018; 19:1271-1279. [PMID: 29633466 DOI: 10.1002/cbic.201800118] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Indexed: 12/21/2022]
Abstract
Neuro-regeneration after trauma requires growth and reconnection of neurons to reestablish information flow in particular directions across the damaged tissue. To support this process, biomaterials for nerve tissue regeneration need to provide spatial information to adhesion receptors on the cell membrane and to provide directionality to growing neurites. Here, photoactivatable adhesive peptides based on the CASIKVAVSADR laminin peptidomimetic are presented and applied to spatiotemporal control of neuronal growth to biomaterials in vitro. The introduction of a photoremovable group [6-nitroveratryl (NVOC), 3-(4,5-dimethoxy-2-nitrophenyl)butan-2-yl (DMNPB), or 2,2'-((3'-(1-hydroxypropan-2-yl)-4'-nitro-[1,1'-biphenyl]-4-yl)azanediyl)bis(ethan-1-ol) (HANBP)] at the amino terminal group of the K residue temporally inhibited the activity of the peptide. The bioactivity was regained through controlled light exposure. When used in neuronal culture substrates, the peptides allowed light-based control of the attachment and differentiation of neuronal cells. Site-selective irradiation activated adhesion and differentiation cues and guided seeded neurons to grow in predefined patterns. This is the first demonstration of ligand-based light-controlled interaction between neuronal cells and biomaterials.
Collapse
Affiliation(s)
- Aleeza Farrukh
- INM-Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany.,Max Planck Graduate Center, Forum Universitatis 2, Building 1111, 55122, Mainz, Germany
| | - Wenqiang Fan
- Institute of Physiological Chemistry, University Medical Center Johannes Gutenberg, Hanns-Dieter-Hüsch-Weg 19, 55128, Mainz, Germany
| | - Shifang Zhao
- INM-Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany.,Saarland University, Chemistry Department, 66123, Saarbrücken, Germany
| | - Marcelo Salierno
- Institute of Physiological Chemistry, University Medical Center Johannes Gutenberg, Hanns-Dieter-Hüsch-Weg 19, 55128, Mainz, Germany.,INIBIOMA, CRUB, Universidad Nacional del Comahue, Quintral 1250, 8400, S.C. Bariloche, Argentina
| | - Julieta I Paez
- INM-Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany
| | - Aránzazu Del Campo
- INM-Leibniz Institute for New Materials, Campus D2 2, 66123, Saarbrücken, Germany.,Saarland University, Chemistry Department, 66123, Saarbrücken, Germany
| |
Collapse
|
8
|
Farrukh A, Paez JI, Salierno M, Fan W, Berninger B, del Campo A. Bifunctional Poly(acrylamide) Hydrogels through Orthogonal Coupling Chemistries. Biomacromolecules 2017; 18:906-913. [DOI: 10.1021/acs.biomac.6b01784] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Aleeza Farrukh
- INM—Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken. Germany
- Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
| | - Julieta I. Paez
- INM—Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken. Germany
- Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
| | - Marcelo Salierno
- Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
- Institute
of Physiological Chemistry, University Medical Center, Johannes Gutenberg University Mainz, Hanns-Dieter-Hüsch-Weg 19, 55128 Mainz, Germany
- Focus
Program Translational Neuroscience, Johannes Gutenberg University Mainz, Langenbeck strasse 1, 55131 Mainz, Germany
| | - Wenqiang Fan
- Institute
of Physiological Chemistry, University Medical Center, Johannes Gutenberg University Mainz, Hanns-Dieter-Hüsch-Weg 19, 55128 Mainz, Germany
- Focus
Program Translational Neuroscience, Johannes Gutenberg University Mainz, Langenbeck strasse 1, 55131 Mainz, Germany
| | - Benedikt Berninger
- Institute
of Physiological Chemistry, University Medical Center, Johannes Gutenberg University Mainz, Hanns-Dieter-Hüsch-Weg 19, 55128 Mainz, Germany
- Focus
Program Translational Neuroscience, Johannes Gutenberg University Mainz, Langenbeck strasse 1, 55131 Mainz, Germany
| | - Aránzazu del Campo
- INM—Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken. Germany
- Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
- Chemistry
Department, Saarland University, 66123 Saarbrücken, Germany
| |
Collapse
|
9
|
Pham JT, Xue L, del Campo A, Salierno M. Guiding cell migration with microscale stiffness patterns and undulated surfaces. Acta Biomater 2016; 38:106-15. [PMID: 27109767 DOI: 10.1016/j.actbio.2016.04.031] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 04/14/2016] [Accepted: 04/18/2016] [Indexed: 01/13/2023]
Abstract
UNLABELLED By placing stiff structures under soft materials, prior studies have demonstrated that cells sense and prefer to position themselves over the stiff structures. However, an understanding of how cells migrate on such surfaces has not been established. Many studies have also shown that cells readily align to surface topography. Here we investigate the influence of these two aspects in directing cell migration on surfaces with 5 and 10μm line stiffness patterns (a cellular to subcellular length scale). A simple approach to create flat, stiffness-patterned surfaces by suspending a thin, low modulus polydimethylsiloxane (PDMS) film over a high modulus PDMS structure is presented, as well as a route to add undulations. We confirm that cells are able to sense through the thin film by observation of focal adhesions being positioned on stiff regions. We examine migration by introducing migration efficiency, a quantitative parameter to determine how strongly cells migrate in a certain direction. We found that cells have a preference to align and migrate along stiffness patterns while the addition of undulations boosts this effect, significantly increasing migration efficiency in either case. Interestingly, we found speed to play little role in the migration efficiency and to be mainly influenced by the top layer modulus. Our results demonstrate that both stiffness patterns and surface undulations are important considerations when investigating the interactions of cells with biomaterial surfaces. STATEMENT OF SIGNIFICANCE Two common physical considerations for cell-surface interactions include patterned stiffness and patterned topography. However, their relative influences on cell migration behavior have not been established, particularly on cellular to subcellular scale patterns. For stiffness patterning, it has been recently shown that cells tend to position themselves over a stiff structure that is placed under a thin soft layer. By quantifying the directional migration efficiency on such surfaces with and without undulations, we show that migration can be manipulated by flat stiffness patterns, although surface undulations also play a strong role. Our results offer insight on the effect of cellular scale stiffness and topographical patterns on cell migration, which is critical for the development of fundamental cell studies and engineered implants.
Collapse
|
10
|
Farrukh A, Paez JI, Salierno M, del Campo A. Bioconjugating Thiols to Poly(acrylamide) Gels for Cell Culture Using Methylsulfonyl Co-monomers. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201509986] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Aleeza Farrukh
- Max-Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Germany
- INM-Leibniz Institute for New Materials.; Campus D2 2; 66123 Saarbrücken Germany
| | - Julieta I. Paez
- Max-Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Germany
- INM-Leibniz Institute for New Materials.; Campus D2 2; 66123 Saarbrücken Germany
| | - Marcelo Salierno
- Max-Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Germany
| | - Aránzazu del Campo
- Max-Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Germany
- INM-Leibniz Institute for New Materials.; Campus D2 2; 66123 Saarbrücken Germany
- Saarland University; Campus Saarbrücken D2 2; 66123 Saarbrücken Germany
| |
Collapse
|
11
|
Farrukh A, Paez JI, Salierno M, del Campo A. Bioconjugating Thiols to Poly(acrylamide) Gels for Cell Culture Using Methylsulfonyl Co-monomers. Angew Chem Int Ed Engl 2016; 55:2092-6. [DOI: 10.1002/anie.201509986] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 12/07/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Aleeza Farrukh
- Max-Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Germany
- INM-Leibniz Institute for New Materials.; Campus D2 2; 66123 Saarbrücken Germany
| | - Julieta I. Paez
- Max-Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Germany
- INM-Leibniz Institute for New Materials.; Campus D2 2; 66123 Saarbrücken Germany
| | - Marcelo Salierno
- Max-Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Germany
| | - Aránzazu del Campo
- Max-Planck-Institut für Polymerforschung; Ackermannweg 10 55128 Mainz Germany
- INM-Leibniz Institute for New Materials.; Campus D2 2; 66123 Saarbrücken Germany
- Saarland University; Campus Saarbrücken D2 2; 66123 Saarbrücken Germany
| |
Collapse
|
12
|
Ortalli AL, Fiore L, Di Napoli J, Rapacioli M, Salierno M, Etchenique R, Flores V, Sanchez V, Carri NG, Scicolone G. EphA3 expressed in the chicken tectum stimulates nasal retinal ganglion cell axon growth and is required for retinotectal topographic map formation. PLoS One 2012; 7:e38566. [PMID: 22685584 PMCID: PMC3369860 DOI: 10.1371/journal.pone.0038566] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [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: 12/07/2011] [Accepted: 05/07/2012] [Indexed: 11/29/2022] Open
Abstract
Background Retinotopic projection onto the tectum/colliculus constitutes the most studied model of topographic mapping and Eph receptors and their ligands, the ephrins, are the best characterized molecular system involved in this process. Ephrin-As, expressed in an increasing rostro-caudal gradient in the tectum/colliculus, repel temporal retinal ganglion cell (RGC) axons from the caudal tectum and inhibit their branching posterior to their termination zones. However, there are conflicting data regarding the nature of the second force that guides nasal axons to invade and branch only in the caudal tectum/colliculus. The predominant model postulates that this second force is produced by a decreasing rostro-caudal gradient of EphA7 which repels nasal optic fibers and prevents their branching in the rostral tectum/colliculus. However, as optic fibers invade the tectum/colliculus growing throughout this gradient, this model cannot explain how the axons grow throughout this repellent molecule. Methodology/Principal Findings By using chicken retinal cultures we showed that EphA3 ectodomain stimulates nasal RGC axon growth in a concentration dependent way. Moreover, we showed that nasal axons choose growing on EphA3-expressing cells and that EphA3 diminishes the density of interstitial filopodia in nasal RGC axons. Accordingly, in vivo EphA3 ectodomain misexpression directs nasal optic fibers toward the caudal tectum preventing their branching in the rostral tectum. Conclusions We demonstrated in vitro and in vivo that EphA3 ectodomain (which is expressed in a decreasing rostro-caudal gradient in the tectum) is necessary for topographic mapping by stimulating the nasal axon growth toward the caudal tectum and inhibiting their branching in the rostral tectum. Furthermore, the ability of EphA3 of stimulating axon growth allows understanding how optic fibers invade the tectum growing throughout this molecular gradient. Therefore, opposing tectal gradients of repellent ephrin-As and of axon growth stimulating EphA3 complement each other to map optic fibers along the rostro-caudal tectal axis.
Collapse
Affiliation(s)
- Ana Laura Ortalli
- Laboratory of Developmental Neurobiology, Institute of Cell Biology and Neurosciences “Prof. E. De Robertis” (UBA-CONICET), School of Medicine, University of Buenos Aires, Buenos Aires, Argentina
| | - Luciano Fiore
- Laboratory of Developmental Neurobiology, Institute of Cell Biology and Neurosciences “Prof. E. De Robertis” (UBA-CONICET), School of Medicine, University of Buenos Aires, Buenos Aires, Argentina
| | - Jennifer Di Napoli
- Laboratory of Developmental Neurobiology, Institute of Cell Biology and Neurosciences “Prof. E. De Robertis” (UBA-CONICET), School of Medicine, University of Buenos Aires, Buenos Aires, Argentina
| | - Melina Rapacioli
- Interdisciplinary Group in Theoretical Biology, Department of Bioestructural Sciences, Favaloro University, Buenos Aires, Argentina
| | - Marcelo Salierno
- Department of Inorganic, Analytical and Physical Chemistry (INQUIMAE), Faculty of Exact and Natural Sciences, University of Buenos Aires, Buenos Aires, Argentina
| | - Roberto Etchenique
- Department of Inorganic, Analytical and Physical Chemistry (INQUIMAE), Faculty of Exact and Natural Sciences, University of Buenos Aires, Buenos Aires, Argentina
| | - Vladimir Flores
- Laboratory of Developmental Neurobiology, Institute of Cell Biology and Neurosciences “Prof. E. De Robertis” (UBA-CONICET), School of Medicine, University of Buenos Aires, Buenos Aires, Argentina
- Interdisciplinary Group in Theoretical Biology, Department of Bioestructural Sciences, Favaloro University, Buenos Aires, Argentina
| | - Viviana Sanchez
- Laboratory of Developmental Neurobiology, Institute of Cell Biology and Neurosciences “Prof. E. De Robertis” (UBA-CONICET), School of Medicine, University of Buenos Aires, Buenos Aires, Argentina
| | | | - Gabriel Scicolone
- Laboratory of Developmental Neurobiology, Institute of Cell Biology and Neurosciences “Prof. E. De Robertis” (UBA-CONICET), School of Medicine, University of Buenos Aires, Buenos Aires, Argentina
- * E-mail:
| |
Collapse
|
13
|
Wirkner M, Weis S, San Miguel V, Álvarez M, Gropeanu RA, Salierno M, Sartoris A, Unger RE, Kirkpatrick CJ, del Campo A. Photoactivatable caged cyclic RGD peptide for triggering integrin binding and cell adhesion to surfaces. Chembiochem 2011; 12:2623-9. [PMID: 22058073 DOI: 10.1002/cbic.201100437] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Indexed: 12/19/2022]
Abstract
We report the synthesis and properties of a photoactivatable caged RGD peptide and its application for phototriggering integrin- and cell-binding to surfaces. We analysed in detail 1) the differences in the integrin-binding affinity of the caged and uncaged forms by quartz crystal microbalance (QCM) studies, 2) the efficiency and yield of the photolytic uncaging reaction, 3) the biocompatibility of the photolysis by-products and irradiation conditions, 4) the possibility of site, temporal and density control of integrin-binding and therefore human cell attachment, and 5) the possibility of in situ generation of cell patterns and cell gradients by controlling the UV exposure. These studies provide a clear picture of the potential and limitations of caged RGD for integrin-mediated cell adhesion and demonstrate the application of this approach to the control and study of cell interactions and responses.
Collapse
Affiliation(s)
- Melanie Wirkner
- Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
| | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Wirkner M, Alonso JM, Maus V, Salierno M, Lee TT, García AJ, del Campo A. Triggered cell release from materials using bioadhesive photocleavable linkers. Adv Mater 2011; 23:3907-3910. [PMID: 21618293 DOI: 10.1002/adma.201100925] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Revised: 04/29/2011] [Indexed: 05/30/2023]
Affiliation(s)
- Melanie Wirkner
- Max-Planck-Institut für Polymerforschung, Ackermannweg 10, Mainz, Germany
| | | | | | | | | | | | | |
Collapse
|
15
|
Bruno L, Salierno M, Wetzler DE, Despósito MA, Levi V. Mechanical properties of organelles driven by microtubule-dependent molecular motors in living cells. PLoS One 2011; 6:e18332. [PMID: 21483765 PMCID: PMC3069964 DOI: 10.1371/journal.pone.0018332] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [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: 12/28/2010] [Accepted: 02/25/2011] [Indexed: 11/18/2022] Open
Abstract
The organization of the cytoplasm is regulated by molecular motors which transport organelles and other cargoes along cytoskeleton tracks. Melanophores have pigment organelles or melanosomes that move along microtubules toward their minus and plus end by the action of cytoplasmic dynein and kinesin-2, respectively. In this work, we used single particle tracking to characterize the mechanical properties of motor-driven organelles during transport along microtubules. We tracked organelles with high temporal and spatial resolutions and characterized their dynamics perpendicular to the cytoskeleton track. The quantitative analysis of these data showed that the dynamics is due to a spring-like interaction between melanosomes and microtubules in a viscoelastic microenvironment. A model based on a generalized Langevin equation explained these observations and predicted that the stiffness measured for the motor complex acting as a linker between organelles and microtubules is ∼ one order smaller than that determined for motor proteins in vitro. This result suggests that other biomolecules involved in the interaction between motors and organelles contribute to the mechanical properties of the motor complex. We hypothesise that the high flexibility observed for the motor linker may be required to improve the efficiency of the transport driven by multiple copies of motor molecules.
Collapse
Affiliation(s)
- Luciana Bruno
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 1, Ciudad Universitaria, Ciudad de Buenos Aires, Argentina
| | - Marcelo Salierno
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Ciudad de Buenos Aires, Argentina
| | - Diana E. Wetzler
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Ciudad de Buenos Aires, Argentina
| | - Marcelo A. Despósito
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 1, Ciudad Universitaria, Ciudad de Buenos Aires, Argentina
| | - Valeria Levi
- Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Ciudad de Buenos Aires, Argentina
- * E-mail:
| |
Collapse
|
16
|
Filevich O, Salierno M, Etchenique R. A caged nicotine with nanosecond range kinetics and visible light sensitivity. J Inorg Biochem 2010; 104:1248-51. [DOI: 10.1016/j.jinorgbio.2010.08.003] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2010] [Revised: 07/20/2010] [Accepted: 08/06/2010] [Indexed: 10/19/2022]
|
17
|
Salierno M, Marceca E, Peterka DS, Yuste R, Etchenique R. A fast ruthenium polypyridine cage complex photoreleases glutamate with visible or IR light in one and two photon regimes. J Inorg Biochem 2009; 104:418-22. [PMID: 20060592 DOI: 10.1016/j.jinorgbio.2009.12.004] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2009] [Revised: 12/02/2009] [Accepted: 12/04/2009] [Indexed: 11/17/2022]
Abstract
We introduce a new caged glutamate, based in a ruthenium bipyridyl core, that undergoes heterolytic cleavage after irradiation with visible light with wavelengths up to 532nm, yielding free glutamate in less than 50ns. Glutamate photorelease occurs also efficiently following two-photon (2P) excitation at 800nm, and has a functional cross section of 0.14GM.
Collapse
Affiliation(s)
- Marcelo Salierno
- Departamento de Química Inorgánica, Analítica y Química Física, INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
| | | | | | | | | |
Collapse
|
18
|
Gueron G, De Siervi A, Ferrando M, Salierno M, De Luca P, Elguero B, Meiss R, Navone N, Vazquez ES. Critical role of endogenous heme oxygenase 1 as a tuner of the invasive potential of prostate cancer cells. Mol Cancer Res 2009; 7:1745-55. [PMID: 19903769 DOI: 10.1158/1541-7786.mcr-08-0325] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Prostate cancer (PCa) is the second leading cause of cancer-associated death in men. Inflammation has been recognized as a risk factor for this disease. Heme oxygenase 1 (HO-1), the inducible isoform of the rate-limiting enzyme in heme degradation, counteracts oxidative and inflammatory damage. Here, we investigated the regulated expression of HO-1 and its functional consequences in PCa. We studied the effect of genetic and pharmacologic disruption of HO-1 in the growth, invasion, and migration in androgen-sensitive (MDA PCa2b and LNCaP) and androgen-insensitive (PC3) PCa cell lines. Our results show that HO-1 levels are markedly decreased in PC3 compared with MDA PCa2b and LNCaP. Hemin treatment increased HO-1 at both protein and mRNA levels in all cell lines and decreased cell proliferation and invasion. Furthermore, overexpression of HO-1 in PC3 resulted in markedly reduced cell proliferation and migration. Accordingly, small interfering RNA-mediated silencing of HO-1 expression in MDA PCa2b cells resulted in increased proliferation and invasion. Using reverse transcription-quantitative PCR-generated gene array, a set of inflammatory and angiogenic genes were upregulated or downregulated in response to HO-1 overexpression identifying matrix metalloprotease 9 (MMP9) as a novel downstream target of HO-1. MMP9 production and activity was downregulated by HO-1 overexpression. Furthermore, PC3 cells stably transfected with HO-1 (PC3HO-1) and controls were injected into nu/nu mice for analysis of in vivo tumor xenograft phenotype. Tumor growth and MMP9 expression was significantly reduced in PC3HO-1 tumors compared with control xenografts. Taken together, these results implicate HO-1 in PCa cell migration and proliferation suggesting its potential role as a therapeutic target in clinical settings.
Collapse
Affiliation(s)
- Geraldine Gueron
- Department of Biological Chemistry, School of Sciences, University of Buenos Aires, Buenos Aires, Argentina
| | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Quaglino A, Salierno M, Pellegrotti J, Rubinstein N, Kordon EC. Mechanical strain induces involution-associated events in mammary epithelial cells. BMC Cell Biol 2009; 10:55. [PMID: 19615079 PMCID: PMC2721828 DOI: 10.1186/1471-2121-10-55] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [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: 01/05/2009] [Accepted: 07/17/2009] [Indexed: 12/04/2022] Open
Abstract
Background Shortly after weaning, a complex multi-step process that leads to massive epithelial apoptosis is triggered by tissue local factors in the mouse mammary gland. Several reports have demonstrated the relevance of mechanical stress to induce adaptive responses in different cell types. Interestingly, these signaling pathways also participate in mammary gland involution. Then, it has been suggested that cell stretching caused by milk accumulation after weaning might be the first stimulus that initiates the complete remodeling of the mammary gland. However, no previous report has demonstrated the impact of mechanical stress on mammary cell physiology. To address this issue, we have designed a new practical device that allowed us to evaluate the effects of radial stretching on mammary epithelial cells in culture. Results We have designed and built a new device to analyze the biological consequences of applying mechanical stress to cells cultured on flexible silicone membranes. Subsequently, a geometrical model that predicted the percentage of radial strain applied to the elastic substrate was developed. By microscopic image analysis, the adjustment of these calculations to the actual strain exerted on the attached cells was verified. The studies described herein were all performed in the HC11 non-tumorigenic mammary epithelial cell line, which was originated from a pregnant BALB/c mouse. In these cells, as previously observed in other tissue types, mechanical stress induced ERK1/2 phosphorylation and c-Fos mRNA and protein expression. In addition, we found that mammary cell stretching triggered involution associated cellular events as Leukemia Inhibitory Factor (LIF) expression induction, STAT3 activation and AKT phosphorylation inhibition. Conclusion Here, we show for the first time, that mechanical strain is able to induce weaning-associated events in cultured mammary epithelial cells. These results were obtained using a new practical and affordable device specifically designed for such a purpose. We believe that our results indicate the relevance of mechanical stress among the early post-lactation events that lead to mammary gland involution.
Collapse
Affiliation(s)
- Ana Quaglino
- Departamento de Química Biológica e Instituto de Fisiología, Biología Molecular y Neurociencias-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina.
| | | | | | | | | |
Collapse
|
20
|
Fino E, Araya R, Peterka DS, Salierno M, Etchenique R, Yuste R. RuBi-Glutamate: Two-Photon and Visible-Light Photoactivation of Neurons and Dendritic spines. Front Neural Circuits 2009; 3:2. [PMID: 19506708 PMCID: PMC2691658 DOI: 10.3389/neuro.04.002.2009] [Citation(s) in RCA: 147] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2009] [Accepted: 04/27/2009] [Indexed: 11/13/2022] Open
Abstract
We describe neurobiological applications of RuBi-Glutamate, a novel caged-glutamate compound based on ruthenium photochemistry. RuBi-Glutamate can be excited with visible wavelengths and releases glutamate after one- or two-photon excitation. It has high quantum efficiency and can be used at low concentrations, partly avoiding the blockade of GABAergic transmission present with other caged compounds. Two-photon uncaging of RuBi-Glutamate has a high spatial resolution and generates excitatory responses in individual dendritic spines with physiological kinetics. With laser beam multiplexing, two-photon RuBi-Glutamate uncaging can also be used to depolarize and fire pyramidal neurons with single-cell resolution. RuBi-Glutamate therefore enables the photoactivation of neuronal dendrites and circuits with visible or two-photon light sources, achieving single cell, or even single spine, precision.
Collapse
Affiliation(s)
- Elodie Fino
- Howard Hughes Medical Institute, Department of Biological Sciences, Columbia UniversityNew York, NY, USA
| | - Roberto Araya
- Howard Hughes Medical Institute, Department of Biological Sciences, Columbia UniversityNew York, NY, USA
| | - Darcy S. Peterka
- Howard Hughes Medical Institute, Department of Biological Sciences, Columbia UniversityNew York, NY, USA
| | - Marcelo Salierno
- Departamento de Química Inorgánica Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos AiresBuenos Aires, Argentina
| | - Roberto Etchenique
- Departamento de Química Inorgánica Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos AiresBuenos Aires, Argentina
| | - Rafael Yuste
- Howard Hughes Medical Institute, Department of Biological Sciences, Columbia UniversityNew York, NY, USA
| |
Collapse
|
21
|
|
22
|
Salierno M, Cabrera R, Filevich O, Etchenique R. Encapsulated Petri dish system for single-cell drug delivery and long-term time lapse microscopy. Anal Biochem 2007; 371:208-14. [PMID: 17884006 DOI: 10.1016/j.ab.2007.08.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2007] [Accepted: 08/06/2007] [Indexed: 11/19/2022]
Abstract
We have developed a system that allows focal drug application for cell culture microscopy. Single-cell drug delivery is achieved through the insertion of a patch-clamp-like micropipette in a microenvironment-controlled chamber mounted on a standard 35-mm Petri dish. The system has precise control of temperature, CO(2) concentration, and humidity, while preventing contamination during experiments. The use of standard Petri dishes allows long-term experiments by alternating in situ microscopy with incubator growth. Modern biological long-term experiments such as the characterization of drug effects on cell movement, axonal guidance, mitosis, apoptosis, differentiation, or volume regulation can be performed. The chamber is compatible with any inverted microscope without significant modifications.
Collapse
Affiliation(s)
- Marcelo Salierno
- Departamento de Química Inorgánica, Analítica y Química Física, INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina
| | | | | | | |
Collapse
|
23
|
Abstract
The synthesis and characterization of a series of ruthenium bis(bipyridine) complexes where the inorganic moiety acts as a photolabile protecting group is described. Complexes of the type [Ru(bpy)2L2]+ where bpy = 2,2'-bipyridine and L = butylamine, gamma-aminobutyric acid, tyramine, tryptamine, and serotonin were studied by nuclear magnetic resonance, cyclic voltammetry, and electronic absorption spectroscopy. In all cases, ligands are coordinated by the amine group. The complexes are stable in water for several days and deliver one molecule of ligand upon irradiation with visible light (450 nm). These properties make them suitable for their use as biological caged compounds.
Collapse
Affiliation(s)
- Leonardo Zayat
- Departamento de Química Inorgánica, Analítica y Química Física, INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pabellón 2, Argentina
| | | | | |
Collapse
|