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TRPM3 is expressed in sphingosine-responsive myelinating oligodendrocytes

Item Type:Article
Title:TRPM3 is expressed in sphingosine-responsive myelinating oligodendrocytes
Creators Name:Hoffmann, A. and Grimm, C. and Kraft, R. and Goldbaum, O. and Wrede, A. and Nolte, C. and Hanisch, U.K. and Richter-Landsberg, C. and Brueck, W. and Kettenmann, H. and Harteneck, C.
Abstract:Oligodendrocytes are the myelin-forming cells of the CNS and guarantee proper nerve conduction. Sphingosine, one major component of myelin, has recently been identified to activate TRPM3, a member of the melastatin-related subfamily of TRP (transient receptor potential) channels. TRPM3 has been demonstrated to be expressed in brain with unknown cellular distribution. Here, we show for the first time that TRPM3 is expressed in oligodendrocytes in vitro and in vivo. TRPM3 is present during oligodendrocyte differentiation. Immunohistochemistry of adult rat brain slices revealed staining of white matter areas, which co-localized with oligodendrocyte markers. Analysis of the developmental distribution revealed that, prior to myelination, TRPM3 channels are localized on neurons. On oligodendrocytes they are found after the onset of myelination. RT-PCR studies showed that the transcription of TRPM3 splice variants is also developmentally regulated in vitro. Ca(2+) imaging approaches revealed the presence of a sphingosine-induced Ca(2+) entry mechanism in oligodendrocytes - with a pharmacologic profile similar to the profile published for heterologously expressed TRPM3. These findings indicate that TRPM3 participates as a Ca(2+)-permeable and sphingosine-activated channel in oligodendrocyte differentiation and CNS myelination.
Keywords:Oligodendrocytes, Transient Receptor Potential, Calcium Homeostasis, TRPM3, Animals, Rats
Source:Journal of Neurochemistry
Page Range:654-665
Date:1 August 2010
Official Publication:https://doi.org/10.1111/j.1471-4159.2010.06644.x
PubMed:View item in PubMed

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