Matches in SemOpenAlex for { <https://semopenalex.org/work/W2005445045> ?p ?o ?g. }
- W2005445045 endingPage "894" @default.
- W2005445045 startingPage "883" @default.
- W2005445045 abstract "We found that transgenic (tg) mice stably expressing a bacterial artificial chromosome (BAC)-derived human complement receptor type 2 (CR2/CD21) gene demonstrate B cell specific hCR2 protein expression, normal B cell development and no changes in B cell subpopulations. To determine whether this BAC-encoded human CR2 (hCR2) can replace mouse CR2/CR1 in Cr2−/− mice and restore humoral immune responses to model foreign antigens (Ags), we generated hCR2+/−Cr2−/− tg mice and immunized them with sheep red blood cells (SRBC). We found that hCR2+/−Cr2−/− mice demonstrated anti-SRBC antibody (Ab) levels that were initially comparable to Cr2−/− mice after a single injection of the Ag, but then showed marked increases in anti-SRBC IgM and IgG1 levels after a second immunization. Identical results were found with a second model Ag, NP-Ficoll. To further confirm that this improvement in Ag-specific Ab production over Cr2−/− mice was indeed due to hCR2 expression, as well as to examine the effects of treating hCR2+/−Cr2−/− mice with an inhibitory anti-hCR2 monoclonal Ab (mAb) in vivo, we used mAb 171, an anti-hCR2 mAb that we have shown directly recognizes the C3d ligand binding site on hCR2. We first found that mAb 171 completely blocked hCR2-dependent co-activation of hCR2-tg B cells by anti-BCR/C3d complexes as measured in vitro by intracellular calcium influx. The i.p. injection of 1 mg of mAb 171 was then found to induce for at least three weeks only partial loss of hCR2 surface expression, without modifying B and T cell numbers or the apparent activation status of the cells. Treatment of hCR2+/−Cr2−/− mice with mAb 171 also substantially suppressed the development of anti-SRBC and anti-NP Abs following immunization with Ags. The development of this model system should allow the study of the effects of manipulating hCR2 function in vivo with potential therapeutic compounds." @default.
- W2005445045 created "2016-06-24" @default.
- W2005445045 creator A5002831713 @default.
- W2005445045 creator A5005296833 @default.
- W2005445045 creator A5040063597 @default.
- W2005445045 creator A5079260336 @default.
- W2005445045 date "2011-03-01" @default.
- W2005445045 modified "2023-10-16" @default.
- W2005445045 title "Human complement receptor type 2 (CR2/CD21) transgenic mice provide an in vivo model to study immunoregulatory effects of receptor antagonists" @default.
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