Zusammenfassung
Studienziel: Chondroblastome und
Chondromyxoidfibrome zählen zu den seltenen benignen Skelettneoplasien,
die teilweise überlappende histomorphologische Charakteristika zeigen. In
der vorliegenden Arbeit wird die Matrixzusammensetzung von
Chondromyxoidfibromen und Chondroblastomen untersucht, um anhand typischer
zellbiologischer Marker den zellulären Phänotyp dieser
Tumorentitäten näher charakterisieren und differenzieren zu
können. Methodik: Die Matrixzusammensetzung von
Chondroblastomen und Chondromyxoidfibromen wurden histologisch, histochemisch
und immunhistochemisch charakterisiert. Zelluläre Expressionsmuster wurden
mittels mRNA In-situ-Hybridisierung ermittelt. Ergebnisse: Chondroblastome zeichneten sich durch einen
prominenten Nachweis von Typ-I-Kollagen und einer fokal osteoidartigen
Tumormatrix aus. Kollagen Typ II als typischer chondrozytärer
Differenzierungsmarker konnte dagegen nicht nachgewiesen werden. In
Chondromyxoidfibromen konnten hingegen fokal chondroidartige Tumorareale mit
Expression von Typ-II-Kollagen beobachtet werden. Schlussfolgerung: Die vorliegende Untersuchung
charakterisiert Chondroblastome und Chondromyxoidfibrome als Skelettneoplasien,
die sich zellbiologisch anhand charakteristischer Matrixproteine unterscheiden
lassen: Kollagen Typ II als typischer Marker chondroblastischer Differenzierung
konnte in Chondromyxoidfibromen, nicht aber in Chondroblastomen nachgewiesen
werden. Damit sind beide Tumoren zellbiologisch klar abgrenzbare
Neoplasien.
Abstract
Aim: Chondroblastomas and
chondromyxoidfibromas are rare benign skeletal neoplasms with reported
overlapping histology. Aim of this study was to analyse the biochemical
composition of the matrix of these tumour entities in order to further
characterise the cellular phenotpyes of these neoplasms using typical cell
biological marker genes. Methods: The matrix
compositions of chondroblastomas and chondromyxoidfibromas were analyzed by
HE-histology, histochemistry, and immunolocalization techniques. Cellular gene
expression patterns were detected by mRNA in situ
hybridization. Results: Chondroblastomas are rich in
collagen type I and show foci of an osteoid-like matrix, whereas collagen type
II as a typical marker of chondrocytic differentiation was not detected in any
of the specimens. Chondromyxoidfibromas had foci of chondroid appearance with
chondroblastic cellular differentiation characterised by collagen type II
expression. Conclusion: These results characterise
chondroblastomas and chondromyxoidfibromas as skeletal neoplasms that have a
different biology and which can be distinguished by matrix protein expression
products: collagen type II, the typical marker of chondroblast differentiation,
could only be detected in chondromyxoidfibromas, but not in chondroblastomas.
Thus, both neoplasms are clearly different on the cell biological level.
Schlüsselwörter
Chondroblastome - Chondromyxoidfibrome - Zelldifferenzierung - Kollagen
Key words
Chondroblastoma - chondromyxoidfibroma - cell differentiation - collagen
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Dr. C. Schörle
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