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Titolo:
INCREASED EXPRESSION OF CD44 IN BOVINE ARTICULAR CHONDROCYTES BY CATABOLIC CELLULAR MEDIATORS
Autore:
CHOW G; KNUDSON CB; HOMANDBERG G; KNUDSON W;
Indirizzi:
RUSH PRESBYTERIAN ST LUKES MED CTR,RUSH ARTHRITIS & ORTHOPED INST,DEPT PATHOL CHICAGO IL 60612 RUSH PRESBYTERIAN ST LUKES MED CTR,RUSH ARTHRITIS & ORTHOPED INST,DEPT BIOCHEM CHICAGO IL 60612 RUSH PRESBYTERIAN ST LUKES MED CTR,RUSH ARTHRITIS & ORTHOPED INST,DEPT PATHOL CHICAGO IL 60612
Titolo Testata:
The Journal of biological chemistry
fascicolo: 46, volume: 270, anno: 1995,
pagine: 27734 - 27741
SICI:
0021-9258(1995)270:46<27734:IEOCIB>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
LYMPHOCYTE-HOMING RECEPTOR; FIBRONECTIN FRAGMENTS; CARTILAGE PROTEOGLYCANS; SULFATE PROTEOGLYCAN; ADHESION MOLECULE; HYALURONIC-ACID; CARCINOMA-CELLS; CORE PROTEIN; LINK-PROTEIN; MATRIX;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
57
Recensione:
Indirizzi per estratti:
Citazione:
G. Chow et al., "INCREASED EXPRESSION OF CD44 IN BOVINE ARTICULAR CHONDROCYTES BY CATABOLIC CELLULAR MEDIATORS", The Journal of biological chemistry, 270(46), 1995, pp. 27734-27741

Abstract

Bovine articular chondrocytes cultured in alginate beads were used tostudy the effect of catabolic cellular mediators on CD44 expression. Treatment with either the 29-kDa fragment of fibronectin or interleukin-1 alpha results in a time- and dose-dependent inhibition of proteoglycan synthesis as well as a stimulation in the expression of CD44 mRNAlevel as determined by semiquantitative polymerase chain reaction following reverse transcription, No noticeable effect at 6 h was observed, By 24 h, the major CD44 product (CD44H) from fibronectin fragment-treated cultures showed an 8-fold increase; CD44H from interleukin-1 alpha-treated cultures showed a B-fold increase as compared to control cultures, In addition, a minor band, determined to be an isoform of CD44, was also shown to be up-regulated by both mediators. Stimulation of CD44 mRNA via interleukin-1 was also evident by in situ hybridization studies of bovine as well as human articular cartilage in organ culture, The increased in CD44 mRNA is matched by an increase at the proteinlevel as determined by Western blot analysis, The Western blot reveals a doublet protein band at 80-90 kDa that corresponds to the molecular mass of CD44H, Cultures incubated with fibronectin fragments for 24 h had an 8.0-fold increase in CD44, while a 6.6-fold was observed for interleukin-1 alpha. Fluorescein conjugated hyaluronan binding and internalization studies indicate that the increase in CD44 protein, induced by interleukin-1 alpha, closely correlates with an increase in functional hyaluronan receptors present at the chondrocyte cell surface, Taken together these results indicate that conditions that up-regulate chondrocyte catabolism also up-regulate the expression of CD44, a cellsurface hyaluronan receptor involved in hyaluronan endocytosis.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 07:03:15