Journal article
Proteolipid protein mRNA stability is regulated by axonal contact in the rodent peripheral nervous system
Journal of neurobiology, Vol.44(1), pp.7-19
07/2000
DOI: 10.1002/1097-4695(200007)44:1<7::AID-NEU2>3.0.CO;2-A
PMID: 10880128
Abstract
Proteolipid protein (PLP) and its alternatively spliced isoform, DM20, are the main intrinsic membrane proteins of compact myelin in the CNS. PLP and DM20 are also expressed by Schwann cells, the myelin‐forming cells in the PNS, and are necessary for normal PNS function in humans. We have investigated the expression of PLP in the PNS by examining transgenic mice expressing a LacZ transgene under the control of the PLP promoter. In these animals, myelinating Schwann cells expressed β‐galactosidase more prominently than nonmyelinating Schwann cells. PLP/DM20 mRNA levels, but not those of LacZ mRNA, increased during sciatic nerve development and decreased after axotomy, with resultant Wallerian degeneration. PLP/DM20 transcription rates, in nuclear run off experiments, however, did not increase in developing rat sciatic nerve despite robust increases in PLP/DM20 mRNA levels during the same period. In RNAse protection studies, PLP mRNA levels fell to undetectable levels following nerve transection whereas levels of DM20 were essentially unchanged despite both being transcribed from the same promoter. Finally, cotransfection studies demonstrated that PLP‐GFP, but not DM20‐GFP mRNA is down‐regulated in Schwann cells cultured in the absence of forskolin. Taken together these data demonstrate that steady state levels of PLP mRNA are regulated at a posttranscriptional level in Schwann cells, and that this regulation is mediated by Schwann cell‐axonal contact. Since the difference between these two mRNAs is a 105‐bp sequence in PLP and not in DM20, this sequence is likely to play a role in the regulation of PLP mRNA. © 2000 John Wiley & Sons, Inc. J Neurobiol 44: 7–19, 2000
Details
- Title: Subtitle
- Proteolipid protein mRNA stability is regulated by axonal contact in the rodent peripheral nervous system
- Creators
- Huiyuan JiangCynthia S DuchalaRaj AwatramaniSusan ShumasLeon CarlockJohn KamholzJames GarbernSteven S SchererMichael E ShyWendy B Macklin
- Resource Type
- Journal article
- Publication Details
- Journal of neurobiology, Vol.44(1), pp.7-19
- DOI
- 10.1002/1097-4695(200007)44:1<7::AID-NEU2>3.0.CO;2-A
- PMID
- 10880128
- NLM abbreviation
- J Neurobiol
- ISSN
- 0022-3034
- eISSN
- 1097-4695
- Publisher
- John Wiley & Sons, Inc; New York
- Number of pages
- 13
- Grant note
- National Institutes of Health Muscular Dystrophy Association
- Language
- English
- Date published
- 07/2000
- Academic Unit
- Neurology; Molecular Physiology and Biophysics; Psychiatry; Stead Family Department of Pediatrics; Iowa Neuroscience Institute
- Record Identifier
- 9984020743102771
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