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Grabiec M, Hříbková H, Vařecha M, Střítecká D, Hampl A, Dvořák P, Sun YM. Stage-specific roles of FGF2 signaling in human neural development. Stem Cell Res 2016; 17:330-341. [PMID: 27608170 DOI: 10.1016/j.scr.2016.08.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 07/13/2016] [Accepted: 08/22/2016] [Indexed: 12/14/2022] Open
Abstract
This study elucidated the stage-specific roles of FGF2 signaling during neural development using in-vitro human embryonic stem cell-based developmental modeling. We found that the dysregulation of FGF2 signaling prior to the onset of neural induction resulted in the malformation of neural rosettes (a neural tube-like structure), despite cells having undergone neural induction. The aberrant neural rosette formation may be attributed to the misplacement of ZO-1, which is a polarized tight junction protein and shown co-localized with FGF2/FGFR1 in the apical region of neural rosettes, subsequently led to abnormal neurogenesis. Moreover, the FGF2 signaling inhibition at the stage of neural rosettes caused a reduction in cell proliferation, an increase in numbers of cells with cell-cycle exit, and premature neurogenesis. These effects may be mediated by NUMB, to which expression was observed enriched in the apical region of neural rosettes after FGF2 signaling inhibition coinciding with the disappearance of PAX6+/Ki67+ neural stem cells and the emergence of MAP2+ neurons. Moreover, our results suggested that the hESC-based developmental system reserved a similar neural stem cell niche in vivo.
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Affiliation(s)
- Marta Grabiec
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Hana Hříbková
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Miroslav Vařecha
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Dana Střítecká
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Aleš Hampl
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Petr Dvořák
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Yuh-Man Sun
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic.
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Yu WQ, Eom YS, Shin JA, Nair D, Grzywacz SXZ, Grzywacz NM, Craft CM, Lee EJ. Reshaping the Cone-Mosaic in a Rat Model of Retinitis Pigmentosa: Modulatory Role of ZO-1 Expression in DL-Alpha-Aminoadipic Acid Reshaping. PLoS One 2016; 11:e0151668. [PMID: 26977812 PMCID: PMC4792433 DOI: 10.1371/journal.pone.0151668] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 03/02/2016] [Indexed: 01/21/2023] Open
Abstract
In S334ter-line-3 rat model of Retinitis Pigmentosa (RP), rod cell death induces the rearrangement of cones into mosaics of rings while the fibrotic processes of Müller cells remodel to fill the center of the rings. In contrast, previous work established that DL-alpha-aminoadipic-acid (AAA), a compound that transiently blocks Müller cell metabolism, abolishes these highly structured cone rings. Simultaneously, adherens-junction associated protein, Zonula occludens-1 (ZO-1) expression forms in a network between the photoreceptor segments and Müller cells processes. Thus, we hypothesized that AAA treatment alters the cone mosaic rings by disrupting the distal sealing formed by these fibrotic processes, either directly or indirectly, by down regulating the expression of ZO-1. Therefore, we examined these processes and ZO-1 expression at the outer retina after intravitreal injection of AAA and observed that AAA treatment transiently disrupts the distal glial sealing in RP retina, plus induces cones in rings to become more homogeneous. Moreover, ZO-1 expression is actively suppressed after 3 days of AAA treatment, which coincided with cone ring disruption. Similar modifications of glial sealing and cone distribution were observed after injection of siRNA to inhibit ZO-1 expression. These findings support our hypothesis and provide additional information about the critical role played by ZO-1 in glial sealing and shaping the ring mosaic in RP retina. These studies represent important advancements in the understanding of retinal degeneration's etiology and pathophysiology.
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Affiliation(s)
- Wan-Qing Yu
- Neuroscience Graduate Program, University of Southern California, Los Angeles, California, United States of America
- Department of Biological Structure, University of Washington, Seattle, United States of America
| | - Yun Sung Eom
- Mary D. Allen Laboratory for Vision Research, USC Eye Institute, University of Southern California, Los Angeles, California, United States of America
| | - Jung-A Shin
- Mary D. Allen Laboratory for Vision Research, USC Eye Institute, University of Southern California, Los Angeles, California, United States of America
- Department of Anatomy, School of Medicine, Ewha Womans University, Seoul, Korea
| | - Divya Nair
- Department of Biomedical Engineering, Viterbi School of Engineering, University of Southern California, Los Angeles, California, United States of America
| | - Sara X. Z. Grzywacz
- Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, California, United States of America
| | - Norberto M. Grzywacz
- Neuroscience Graduate Program, University of Southern California, Los Angeles, California, United States of America
- Department of Biomedical Engineering, Viterbi School of Engineering, University of Southern California, Los Angeles, California, United States of America
- Department of Neuroscience, Georgetown University, Washington D.C., United States of America
- Department of Physics, Georgetown University, Washington D.C., United States of America
| | - Cheryl Mae Craft
- Neuroscience Graduate Program, University of Southern California, Los Angeles, California, United States of America
- Mary D. Allen Laboratory for Vision Research, USC Eye Institute, University of Southern California, Los Angeles, California, United States of America
- Department of Ophthalmology, Keck School of Medicine, University of Southern California, Los Angeles, California, United States of America
- Department of Cell & Neurobiology, Keck School of Medicine, University of Southern California, Los Angeles, California, United States of America
| | - Eun-Jin Lee
- Mary D. Allen Laboratory for Vision Research, USC Eye Institute, University of Southern California, Los Angeles, California, United States of America
- Department of Biomedical Engineering, Viterbi School of Engineering, University of Southern California, Los Angeles, California, United States of America
- Department of Ophthalmology, Keck School of Medicine, University of Southern California, Los Angeles, California, United States of America
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Carrasco-Pozo C, Morales P, Gotteland M. Polyphenols protect the epithelial barrier function of Caco-2 cells exposed to indomethacin through the modulation of occludin and zonula occludens-1 expression. J Agric Food Chem 2013; 61:5291-5297. [PMID: 23668856 DOI: 10.1021/jf400150p] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The aim of this study was to determine the protective effect of quercetin, epigallocatechingallate, resveratrol, and rutin against the disruption of epithelial integrity induced by indomethacin in Caco-2 cell monolayers. Indomethacin decreased the transepithelial electrical resistance and increased the permeability of the monolayers to fluorescein-dextran. These alterations were abolished by all the tested polyphenols but rutin, with quercetin being the most efficient. The protective effect of quercetin was associated with its capacity to inhibit the redistribution of ZO-1 protein induced in the tight junction by indomethacin or rotenone, a mitochondrial complex-I inhibitor, and to prevent the decrease of ZO-1 and occludin expression induced by indomethacin. The fact that the antioxidant polyphenols assayed in this study differ in their protective capacity against the epithelial damage induced by indomethacin suggests that this damage is due to the ability of this agent to induce not only oxidative stress but also mitochondrial dysfunction.
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Affiliation(s)
- Catalina Carrasco-Pozo
- Laboratory of Microbiology and Probiotics, Institute of Nutrition and Food Technology (INTA) , Av. Macul 5540, Santiago, P.O. Box 138-11, Chile
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