| Locally synthesized phosphatidylcholine, but not protein, undergoes rapid retrograde axonal transport in the rat sciatic nerve. | |
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MedLine Citation:
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PMID: 8473904 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Retrograde axonal transport of phosphatidylcholine in the sciatic nerve has been demonstrated only after injection of lipid precursors into the cell body region. We now report, however, that after microinjection (1 microliter) of [methyl-3H]choline chloride into the rat sciatic nerve (35-40 mm distal to the L4 and L5 dorsal root ganglia), time-dependent accumulation of 3H-labeled material occurred in dorsal root ganglia ipsilateral, but not contralateral, to the injection site. The level of radioactivity in the ipsilateral dorsal root ganglia was minimal at 2 h after isotope injection but was significantly increased at 7, 24, 48, and 72 h after intraneural isotope injection (n = 3-8 per time point); at these time points, all of the radiolabel in the chloroform/methanol extract of the ipsilateral dorsal root ganglia was present in phosphatidylcholine. The radioactivity in the water-soluble fraction did not show a time-dependent accumulation in the ipsilateral dorsal root ganglia as compared with the contralateral DRGs, ruling out transport or diffusion of precursor molecules. In addition, colchicine injection into the sciatic nerve proximal to the isotope injection site prevented the accumulation of radiolabel in the ipsilateral dorsal root ganglia. Therefore, this time-dependent accumulation of radiolabeled phosphatidylcholine in the ipsilateral dorsal root ganglia is most likely due to retrograde axonal transport of locally synthesized phospholipid material. Moreover, 24 h after injection of both [3H]choline and [35S]-methionine into the sciatic nerve, the ipsilateral/contralateral ratio of radiolabel was 11.7 for 3H but only 1.1 for 35S, indicating that only locally synthesized choline phospholipids, but not protein, were retrogradely transported. |
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Authors:
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S Padilla; E B Freeman; P Tandon; V Z Wilson |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Journal of neurochemistry Volume: 60 ISSN: 0022-3042 ISO Abbreviation: J. Neurochem. Publication Date: 1993 May |
Date Detail:
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Created Date: 1993-05-18 Completed Date: 1993-05-18 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 2985190R Medline TA: J Neurochem Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1900-5 Citation Subset: IM |
Affiliation:
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Cellular and Molecular Toxicology Branch, U.S. Environmental Protection Agency, Chapel Hill, North Carolina 27711. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Axons / metabolism* Biological Transport Choline / metabolism Ganglia, Spinal / metabolism Male Methionine / metabolism Phosphatidylcholines / metabolism* Rats Rats, Inbred Strains Sciatic Nerve / metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Phosphatidylcholines; 62-49-7/Choline; 63-68-3/Methionine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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