title: Interleukin-1 beta-mediated glucose uptake by chondrocytes. Inhibition by cortisol.
abstract: The aim of this study was to investigate the in vitro effects of interleukin-1 beta (IL-1 beta) on cultured human articular chondrocytes from patients with osteoarthritis, by the evaluation of glucose uptake. We also investigated the inhibitory effect of cortisol on IL-1 beta-mediated glucose uptake. Experiments were performed by using 2-deoxy-D-[1-3H]glucose (2-DOG) and confluent monolayer cells at first passage. Confluent cells were also treated for 24 h with different concentrations of cortisol (10(-5), 10(-6) and 10(-7) mol/l). IL-1 beta (100 pg/ml) was added 6 h before glucose uptake studies. Glucose uptake stimulation was observed 3 h after the addition of 100 pg/ml IL-1 beta (+70%) and increased up to 24 h (+145%). The sensitivity and responsiveness of chondrocytes to IL-1 beta, studied after a 6 h association time, appeared to be dose-dependent from 0.1 pg/ml IL-1 beta (+50%) to 100 pg/ml (+130%) over basal values. The effect of the cytokine was protein synthesis-dependent, as demonstrated by using cycloheximide. Cortisol inhibited the action of IL-1 beta on glucose uptake because it reduced stimulating effects by 28% at concentrations as weak as 10(-6) mol/l. Results appeared similar when IL-1 beta and cortisol were added simultaneously 6 h before 2-DOG uptake. The rapid effect of cortisol was protein-synthesis dependent, as indicated by inhibition by cycloheximide. These results suggest that IL-1 beta stimulates chondrocyte metabolic activity. The inhibition of IL-1 beta-mediated glucose uptake is suggested for studying the anti-IL-1 effect of other anti-rheumatic drugs.
authors.affiliation: Laboratoire de Biochimie A, Hôpital Cochin, Paris, France.
authors.forename: A
authors.initials: A
authors.lastname: Hernvann
authors.forename: P
authors.initials: P
authors.lastname: Jaffray
authors.forename: P
authors.initials: P
authors.lastname: Hilliquin
authors.forename: C
authors.initials: C
authors.lastname: Cazalet
authors.forename: C J
authors.initials: CJ
authors.lastname: Menkes
authors.forename: O G
authors.initials: OG
authors.lastname: Ekindjian
mesh_terms: D002358:Cartilage, Articular / Q000166:cytology / Q000378:metabolism*; D002478:Cells, Cultured; D003847:Deoxyglucose / Q000037:antagonists & inhibitors* / Q000493:pharmacokinetics*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D006854:Hydrocortisone / Q000494:pharmacology*; D007375:Interleukin-1 / Q000502:physiology*; D011994:Recombinant Proteins
chemical_list: D007375:Interleukin-1; D011994:Recombinant Proteins; D003847:Deoxyglucose; D006854:Hydrocortisone