Differential expression of tenascin-C and tenascin-X in human astrocytomas.

Abstract:

:Tenascins (TNs) are a family of extracellular matrix glycoproteins. The first member of this family to be recognized, tenascin-C (TN-C), is known to be expressed in various tumors including human astrocytomas. Tenascin-X (TN-X) is the latest member of the TN family to be reported, and its expression in tumor tissues has not yet been examined. In this study, we found expression of TN-X in glioma cell lines and human astrocytomas by immunoblot analysis using anti-mouse TN-X antibodies. We also examined the expression of TN-C and TN-X immunohistochemically in a series of 32 human astrocytomas and tissue from 5 normal brains. Expression of TN-X was up-regulated to a higher degree in low-grade astrocytomas than in high-grade astrocytomas. TN-X was mainly localized in the perivascular stroma around tumor vessels, and weakly expressed in the intercellular spaces among tumor cells. In contrast, TN-C was more strongly expressed in the intercellular spaces and in tumor vessels in high-grade astrocytomas (anaplastic astrocytomas and glioblastomas) than in low-grade astrocytomas. In the tissues expressing both TNs, the distribution of TN-X was often reciprocal to that of TN-C. These findings indicate that the expression of TN-C and TN-X in astrocytomas is different, and that these glycoproteins could be involved in neovascularization in different manners.

journal_name

Acta Neuropathol

journal_title

Acta neuropathologica

authors

Hasegawa K,Yoshida T,Matsumoto K,Katsuta K,Waga S,Sakakura T

doi

10.1007/s004010050636

subject

Has Abstract

pub_date

1997-05-01 00:00:00

pages

431-7

issue

5

eissn

0001-6322

issn

1432-0533

journal_volume

93

pub_type

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