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Myelin formation by Schwann cells in the absence of β4 integrin

✍ Scribed by Regula Frei; James Dowling; Stefano Carenini; Elaine Fuchs; Rudolf Martini

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
355 KB
Volume
27
Category
Article
ISSN
0894-1491

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✦ Synopsis

The interaction of the Schwann cell with its basal lamina has been hypothesized to be an important prerequisite for the formation of a myelin sheath in the peripheral nervous system. One possible player in this interaction is ␤4 integrin; it is up-regulated during myelin formation and, in association with ␣6 integrin, can interact with particular components of the Schwann cell basal lamina. In order to characterize the functional roles of ␤4 integrin during myelination, we investigated myelination in the absence of ␤4 integrin, i.e., in peripheral nerve tissue from ␤4 integrin-deficient mice. Because the mutants die within several hours after birth, we cultured dorsal root ganglia from neonatal mutants under conditions that promote myelination, quantified the myelin segments by immunofluorescence, and investigated the ultrastructure of the cultured myelin sheaths. In another approach, we quantified the few myelin sheaths that are detectable in femoral nerves of newborn animals. Based on both approaches, we conclude that myelination by Schwann cells can occur in the absence of ␤4 integrin demonstrating that this Schwann cell component is dispensable for myelin formation in peripheral nerves.

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