HIF-1α is expressed by osteoclasts in RA.

<p>(A) HIF-1α expression by osteoclasts in the RA synovium (arrows). Representative image from n = 3 cases. (B) HIF-1α (green) and ANGPTL4 (red) expression co-localises in 2 bone-apposing osteoclasts (arrows). All scale bars represent 100 µM. (C) ANGPTL4 (solid lines) and SLC2A1 (Glut-1; dashed lines) mRNA expression in monocyte-derived osteoclasts from RA patients following 24 h exposure to normoxia or hypoxia (2% O₂). Hypoxic fold-change in mRNA expression; *, p<0.05.