The bactericidal permeability increasing protein (BPI) is an antibacterial and endotoxin-neutralizing molecule that is abundant in the granules of polymorphonuclear leukocytes (neutrophil granules). The 31.5-kb-long human BPI gene maps to chromosome 20q11.23-q12, contains 15 exons, and encodes a 456 amino acid protein. Epithelial cells which line mucosal surfaces are the first line of defense against bacterial invasion and infection. BPI localizes to the cell surface of epithelial cells and blocks endotoxin-mediated signaling, thereby protecting mucosal surfaces against gram-negative bacteria and their endotoxin. BPI, lipopolysaccharide binding protein (LBP), phospholipid transfer protein (PLTP), and cholesteryl ester transfer protein (CETP) constitutes a family of functionally related proteins.
Background References
1. Hu, N. et al. 2014. Differential expression of granulopoiesis related genes in neutrophil subsets distinguished by membrane expression of CD177. PloS one. 9: e99671.
2. Ota T., et al. 2004. Complete sequencing and characterization of 21,243 full-length human cDNAs. Nat. Genet. 36:40-45.
Sequence Similarity
Belongs to the BPI/LBP/Plunc superfamily. BPI/LBP family.
Bactericidal permeability-increasing protein antibody
bactericidal/permeability-increasing protein antibody
BPI antibody
BPI fold containing family D, member 1 antibody
BPIFD1 antibody
CAP 57 antibody
rBPI antibody
recombinant BPI holoprotein, rBPI antibody
Images
Western blot analysis of BPI on different lysates with Rabbit anti-BPI antibody (ET1611-6) at 1/2,000 dilution.
Lane 1: THP-1 cell lysate (20 µg/Lane) Lane 2: Jurkat cell lysate (20 µg/Lane) Lane 3: HL-60 cell lysate (20 µg/Lane) Lane 4: Mouse thymus tissue lysate (40 µg/Lane)
Predicted band size: 54 kDa Observed band size: 60 kDa
Exposure time: 3 minutes; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (ET1611-6) at 1/2,000 dilution was used in 5% NFDM/TBST at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature.
Immunocytochemistry analysis of THP-1 cells labeling BPI with Rabbit anti-BPI antibody (ET1611-6) at 1/100 dilution.
Cells were fixed in 4% paraformaldehyde for 15 minutes at room temperature, permeabilized with 0.1% Triton X-100 in PBS for 15 minutes at room temperature, then blocked with 1% BSA in 10% negative goat serum for 1 hour at room temperature. Cells were then incubated with Rabbit anti-BPI antibody (ET1611-6) at 1/100 dilution in 1% BSA in PBST overnight at 4 ℃. Goat Anti-Rabbit IgG H&L (iFluor™ 488, HA1121) was used as the secondary antibody at 1/1,000 dilution. PBS instead of the primary antibody was used as the secondary antibody only control. Nuclear DNA was labelled in blue with DAPI.
Beta tubulin (HA601187, red) was stained at 1/100 dilution overnight at +4℃. Goat Anti-Mouse IgG H&L (iFluor™ 594, HA1126) was used as the secondary antibody at 1/1,000 dilution.
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