E-cadherin expression in postnatal Schwann cells is regulated by the cAMP-dependent protein kinase a pathway
Expression of E‐cadherin in the peripheral nervous system is a highly regulated process that appears postnatally in concert with the development of myelinating Schwann cell lineage. As a major component of autotypic junctions, E‐cadherin plays an important role in maintaining the structural integrit...
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Published in | Glia Vol. 56; no. 15; pp. 1637 - 1647 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Hoboken
Wiley Subscription Services, Inc., A Wiley Company
15.11.2008
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Subjects | |
Online Access | Get full text |
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Summary: | Expression of E‐cadherin in the peripheral nervous system is a highly regulated process that appears postnatally in concert with the development of myelinating Schwann cell lineage. As a major component of autotypic junctions, E‐cadherin plays an important role in maintaining the structural integrity of noncompact myelin regions. In vivo, the appearance of E‐cadherin in postnatal Schwann cell is accompanied by the disappearance of N‐cadherin, suggesting reciprocal regulation of the two cadherins during Schwann cell development. The molecular signal that regulates the cadherin switch in Schwann cell is unclear. Using a neuron‐Schwann cell co‐culture system, here we show that E‐cadherin expression is induced by components on the axonal membrane. We also show that the axonal effect is mediated through cAMP‐dependent protein kinase A (cAMP‐PKA) activation in the Schwann cell: (1) inhibition of cAMP‐PKA blocks axon‐induced E‐cadherin expression and (2) cAMP elevation in the Schwann cell is sufficient to induce E‐cadherin expression. In addition, cAMP‐dependent E‐cadherin expression is promoted by contact between adjacent Schwann cell membranes, suggesting its role in autotypic junction formation during myelination. Furthermore, cAMP‐induced E‐cadherin expression is accompanied by suppression of N‐cadherin expression. Therefore, we propose that axon‐dependent activation of cAMP‐PKA serves as a signal that promotes cadherin switch during postnatal development of Schwann cells. © 2008 Wiley‐Liss, Inc. |
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Bibliography: | istex:04CDC768C84FCC0CCCDF134B783D0D5186631207 New Jersey Commission on Brain Injury Research ark:/67375/WNG-70TRPC9G-6 ArticleID:GLIA20716 NIH - No. RO1-NS45939-01 New Jersey Commission on Spinal Cord Research Audrita T. Crawford and Darshan Desai contributed equally to this work. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 A.T.C and D.D contributed equally to this work Present address: Department of Neurological Surgery, Neurological Institute of New Jersey, The University of Medicine & Dentistry of New Jersey, Newark, NJ 07103 |
ISSN: | 0894-1491 1098-1136 |
DOI: | 10.1002/glia.20716 |