FIG. 5.
Serum-pretreated B. subtilis organisms are phagocytosed by vitamin D3-induced U937 cells in a CD14- and LBP-dependent fashion. (A) Phagocytosis was performed at 37 or 4°C in the presence or absence of 2.5 μg of murine recombinant LBP per ml. Internalization of the labeled bacteria is inhibitable with Fab fragments of the anti-CD14 MAb biG 14 or with a 20-fold excess of unlabeled bacteria (added where indicated). The ratio of cells to labeled bacteria was 1:50. (B) The same experiment as described for panel A was carried out with uninduced U937 cells, which do not express CD14.

