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- W2019916971 abstract "Platelet basic protein (PBP) and several of its derivatives are known for their broad range of functions as signaling molecules and cationic antimicrobial peptides and were considered hitherto megakaryocyte- and platelet-specific. In search of glucocorticoid-regulated antimicrobial systems of monocytes, we found a 15-fold down-regulation of PBP mRNA by differential display. Regulation was confirmed in vivo even at low prednisone doses. Quantitative mRNA analyses confirmed down-regulation also for platelets. Western blotting and immunostains showed down-regulation at the protein level. Pro-PBP derivatives were in the size range of 7.5-14 kD and in immunostains, gave granular cytoplasmatic patterns. Interleukin (IL)-4 and IL-10 induced a similar down-regulation. Phagocytosis resulted in an increase of smaller derivatives in the range of 7.5 kD. Stimulation with interferon-gamma and lipopolysaccharide did decrease expression of PBP and affected derivatization. Expression of PBP and its derivatives is not restricted to the megakaryocytic cell lineage. PBP and some of its derivatives might contribute to the antimicrobial armamentarium of mononuclear phagocytes or have monokine functions. Our studies define PBPs as one among the many immunosuppressive targets of glucocorticoids." @default.
- W2019916971 created "2016-06-24" @default.
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- W2019916971 date "2003-12-12" @default.
- W2019916971 modified "2023-09-29" @default.
- W2019916971 title "Constitutive and regulated expression of platelet basic protein in human monocytes" @default.
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- W2019916971 doi "https://doi.org/10.1189/jlb.0603288" @default.
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