Differential expression of tenascin in the skin during hapten-induced dermatitis |
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Authors: | Yoh-ichi Koyama Keiko Norose Masashi Kusubata Shinkichi Irie Moriaki Kusakabe |
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Institution: | (1) Division of Experimental Animal Research, Tsukuba Life Science Center, The Institute of Physical and Chemical Research, 3-1-1 Koyadai, Tsukuba, Ibaraki, 305, Japan Tel. +810298-36-5264; Fax +810298-36-9010, JP;(2) Nippi Research Institute of Biomatrix, Nippi Inc., 1-1 Senju-Midoricho, Adachi-ku, Tokyo, 120, Japan Tel. +8103-3888-5111; Fax +8103-3870-9631, JP |
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Abstract: | Tenascin is a large extracellular matrix glycoprotein which is found in limited regions of normal adult tissues including
the skin. We investigated the induction of tenascin expression in mouse skin during hapten-induced dermatitis. In the dorsal
skin, hapten application first induced a transient expression of tenascin in deeper regions of the skin. Its distribution
then spread over the whole dermis corresponding to the infiltration of Mac-2-positive macrophages. In the ear, tenascin was
consistently found in the subcutaneous tissue on the inner side, but very little was seen on the outer side. Tenascin did
appear transiently, however, on both sides under hapten treatment. In the early phase of allergic contact dermatitis, no apparent
induction of tenascin expression was observed in the swollen ear. However, there was an abundant tenascin expression on both
sides during healing. Tenascin expressed under normal conditions was mostly the 180-kDa isoform, while the 230-kDa isoform
was markedly induced during healing of the dermatitis. These results suggest that tenascin, particularly the larger 230-kDa
isoform, may play important roles in the pathogenesis and healing of hapten-induced dermatitis.
Accepted: 1 April 1996 |
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