We explore a strategy to substantially increase the half-life of recombinant proteins by genetic fusion to FcIII, a 13-mer IgG-Fc domain binding peptide (IgGBP) originally identified by DeLano and co-workers at Genentech [DeLano WL, et al. (2000) Science 287:1279-1283]. IgGBP fusion increases the in vivo half-life of proteins by enabling the fusion protein to bind serum IgG, a concept originall...

We have designed a novel strategy for the isolation of the rearranged genomic fragments encoding the L-VH-D-JH and L-V kappa/lambda-J kappa/lambda regions of mouse immunoglobulin genes. This strategy is based on the PCR amplification of genomic DNA from mouse hybridomas using multiple specific primers chosen in the 5'-untranslated region and in the intron downstream of the rearranged JH/J kappa...

A study has been made of the production of antiidiotypic antibodies (anti-antibodies) arising during the immunization of 39 rabbits with 19 individual samples of rabbit anti-Proteus vulgaris x 19 antibodies adsorbed onto bacilli. In addition to the regular demonstration of antiidiotypic antibodies attention is drawn to the frequent occurrence of antiallotypic antibodies against molecules of imm...

Induction of germline (GL) epsilon transcripts, an essential step preceding Ig isotype switching to IgE, requires activation of transcription factors by IL-4 and a B cell activator, e.g., CD40 ligand or LPS. We demonstrate that AP-1 (Fos and Jun), induced transiently by CD40 ligand or LPS, binds a DNA element in the mouse GL epsilon promoter. AP-1 synergizes with Stat6 to activate both the inta...

We evaluated the in vitro opsonophagocytic killing activity of monoclonal human immunoglobulin G (IgG), IgM, and IgA specific for Pseudomonas aeruginosa lipopolysaccharide and the in vivo protective capacity in neutropenic mice of both monoclonal and purified polyclonal IgG, IgM, and IgA. Monoclonal IgM was efficacious in mediating opsonophagocytic killing only in conjunction with complement, w...

K/BxN serum-induced passive arthritis was reported to depend on the activation of mast cells, triggered by the activating IgG receptor FcγRIIIA, when engaged by IgG1 autoantibodies present in K/BxN serum. This view is challenged by the fact that FcγRIIIA-deficient mice still develop K/BxN arthritis and because FcγRIIIA is the only activating IgG receptor expressed by mast cells. We investigated...

Abstract Cystic fibrosis (CF) is a genetic disorder that causes severe damage to the lungs and digestive system. CF affects cells produce mucus, sweat, enzymes caused by mutations in Fibrosis Transmembrane Conductance Regulator (CFTR). Expression function of CFTR have been extensively studied on epithelial several recent publications shown also regulates functions myeloid cells. We addressed wh...

Rabbits of the Basilea strain do not produce normal K1b9 light chains but continue to produce immunoglobulins with light chains of the rare K2 isotype and of lambda type. To understand the molecular basis for this unusual expression of kappa light chains in Basilea rabbits, we undertook an analysis of their kappa genes. We isolated and sequenced the mutant kappa 1b9 gene and found a substitutio...

An animal modal has been used to address the question of the biological importance of the known structural difference between the two isotypes of human C4, i.e., C4A and C4B. Guinea pigs deficient in C4 were reconstituted transiently with either human C4A or C4B protein and immunized with the bacteriophage qbX174. Resttlts from this study showed that C4A-reconstituted animals made a secondary r...

IgM ACPA 6 (20) 11 (37) 13 (43) Introduction We and others have previously shown that the development of rheumatoid arthritis (RA) is preceded by IgG anti-citrullinated protein antibody (ACPA) and rheumatoid factor (RF) [1,2]. Furthermore, it was shown that other isotypes of ACPA (IgA and, to a lesser extent, the IgM isotype) also predate the onset of RA [3]. Moreover, smoking has been linked t...