AIM: To study the effect of interleukin-1β( IL-1β) on the activity of vacuolar proton pump( VATPase) and intracellular pH value in the osteoclasts for exploring the mechanism of IL-1β to promote osteoclastic bone absorption. METHODS: The mature osteoclasts were attained by induction of bone marrow monocytes/macrophages. The osteoclasts were cultured with α-MEM and treated with different concentrations( 0. 1,0. 3 and 0. 5 μg/L) of IL-1β. After cultured for 48 h,the mRNA and protein expression of V-ATPase was...