Published online before print May 9, 2006

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(Journal of Leukocyte Biology. 2006;80:196-203.)
© 2006 by Society for Leukocyte Biology

All-trans retinoic acid-induced expression of bactericidal/permeability-increasing protein (BPI) in human myeloid cells correlates to binding of C/EBPß and C/EBP to the BPI promoter

Andreas Lennartsson^*, Karina Vidovic^*, Malene Bjerregaard Pass, Jack B. Cowland and Urban Gullberg^*,1

^* Division of Hematology and Transfusion Medicine, Lund University, Sweden; and
Granulocyte Research Laboratory, Rigshospitalet, Copenhagen, Denmark

¹ Correspondence: Department of Hematology, BMC, C14, S-221 84 Lund, Sweden. E-mail: urban.gullberg{at}med.lu.se

Bactericidal/permeability-increasing protein (BPI) neutralizes the proinflammatory effects of lipopolysaccharide and is of potential clinical use in the treatment of fulminant Gram-negative infections. BPI is a cationic protein with antibacterial activity stored in azurophil (primary) granules of neutrophil granulocytes. However, the absence of BPI in patients with specific granule deficiency indicates a transcriptional control of BPI, which is distinct from that of other azurophil granule proteins. Accordingly, we demonstrate in vivo that the BPI mRNA level peaks, together with mRNA for specific granule proteins, during the myelocytic and metamyelocytic stage of granulocytic maturation. The human promyelocytic cell line NB4 expresses several azurophil granule proteins, but expression of BPI is undetectable. We show that treatment of NB4 cells with all-trans retinoic acid (ATRA) induces BPI expression at mRNA and at protein level. The induction is dependent on de novo protein synthesis, as judged by sensitivity to cycloheximide. Previous investigations have indicated a potential role of CCAAT/enhancer-binding protein (C/EBP) transcription factors in the regulation of BPI expression. Here, we show that induction of NB4 cells with ATRA correlates to direct binding of C/EBPß and C/EBP to the proximal BPI promoter, as determined by electrophoretic mobility shift analysis and chromatin immunoprecipitation. The dependency on C/EBPß and C/EBP provides an explanation for delayed BPI mRNA expression, as compared with mRNA of other azurophil granule proteins.

Key Words: transcriptional regulation • granulocyte • azurophil granule protein • innate immunity