| Development of synapsin I and synapsin II in intraocular hippocampal transplants. | |
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MedLine Citation:
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PMID: 1308193 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Previous studies have indicated that the appearance of synaptic vesicle-associated proteins known as the synapsins is one indicator of synapse formation. In this study, the levels and morphological distribution of synapsin I and synapsin IIa and IIb were studied in intraocular hippocampal transplants and in situ in the intact hippocampus. No detectable levels of either synapsin I or synapsin II were found in the fetal brain. The in situ levels of the synapsins exhibited parallel increases rapidly after birth, reaching peak levels at 8 weeks, after which a slight decline was noted in synapsin I and synapsin IIb. In hippocampal transplants, a comparable increase in the synapsins was seen during the first 8 weeks in oculo. It is likely that the synapse formation in the hippocampal transplants represents synapses from neurons within the transplant, as well as from various peripheral ganglia that send collaterals into the graft. Peripheral and central synapses express different synapsin I: synapsin IIa and IIb ratios. When the ratios of the synapsin proteins in hippocampal transplants were examined ratios essentially identical to those seen in the normal hippocampus were found, despite the numerous peripheral neurites innervating the grafts. Immunohistochemical studies supported the immunoblot data, showing no detectable immunofluorescence with synapsin antibodies in fetal or newborn hippocampal formation. The density of immunoreactive profiles increased substantially both in transplants and in the hippocampal formation in situ during the first 2 postnatal months. In conclusion, the present data demonstrate that hippocampal transplants in oculo can develop significant levels of the synapsins and that there is no time lag in development in these levels compared to the hippocampal formation in situ. |
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Authors:
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H Bergman; M Browning; A C Granholm |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Hippocampus Volume: 2 ISSN: 1050-9631 ISO Abbreviation: Hippocampus Publication Date: 1992 Oct |
Date Detail:
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Created Date: 1993-09-24 Completed Date: 1993-09-24 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9108167 Medline TA: Hippocampus Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 339-47 Citation Subset: IM |
Affiliation:
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Department of Cell Biology, University of Linköping Faculty of Health Sciences, Sweden. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Brain Tissue Transplantation / physiology* Electrophoresis, Polyacrylamide Gel Embryo, Mammalian Eye Fetal Tissue Transplantation / physiology Ganglia, Sympathetic / metabolism Hippocampus / metabolism*, transplantation* Immunoblotting Immunohistochemistry Iris / metabolism Kinetics Molecular Weight Pyramidal Tracts / metabolism Rats Synapsins / biosynthesis*, isolation & purification Time Factors Transplantation, Heterotopic / physiology Trigeminal Ganglion / metabolism |
| Grant Support | |
ID/Acronym/Agency:
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DK40483/DK/NIDDK NIH HHS; NS26377/NS/NINDS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Synapsins |
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