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J. Cell Biol.,
Volume 145, Number 3, May 3, 1999 579-588

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* Department of Cell Biology, Members of the newly identified claudin
gene family constitute tight junction (TJ) strands, which
play a pivotal role in compartmentalization in multicellular organisms. We identified oligodendrocyte-specific protein (OSP) as claudin-11, a new claudin family
member, due to its sequence similarity to claudins as
well as its ability to form TJ strands in transfected fibroblasts. Claudin-11/OSP mRNA was expressed in the
brain and testis. Immunofluorescence microscopy with
anti-claudin-11/OSP polyclonal antibody (pAb) and
anti-neurofilament mAb revealed that in the brain claudin-11/OSP-positive linear structures run in a gentle
spiral around neurofilament-positive axons. At the electron microscopic level, these linear structures were
identified as the so-called interlamellar strands in myelin sheaths of oligodendrocytes. In testis, well-developed TJ strands of Sertoli cells were specifically labeled
with anti-claudin-11/OSP pAb both at immunofluorescence and electron microscopic levels. These findings
indicated that the interlamellar strands of oligodendrocyte myelin sheaths can be regarded as a variant of TJ
strands found in many other epithelial cells, and that
these strands share a specific claudin species, claudin-11/OSP, with those in Sertoli cells to create and maintain the repeated compartments around axons by oligodendrocytes.
Department of Dermatology, and § Department of Anatomy, Faculty of Medicine, Kyoto
University, Sakyo-ku, Kyoto 606, Japan;
Laboratory of Cell Biology, KAN Research Institute Inc., Minami-Kaneda, Suita,
Osaka 564, Japan; and ¶ Department of Molecular Cell Biology, Institute of DNA Medicine, Jikei University School of Medicine,
Nishi-Shinbashi, Minato-ku, Tokyo 105, Japan
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