The CD19 signal transduction molecule is a response regulator of B-lymphocyte differentiation.

Journal Article (Journal Article)

The phenotypes of CD19-deficient (CD19-/-) mice, and human CD19-transgenic (hCD19TG) mice that overexpress CD19 indicate that CD19 is a response regulator of B-lymphocyte surface receptor signaling. To further characterize the function of CD19 during B-cell differentiation, humoral immune responses to a T-cell-independent type 1 [trinitrophenyl-lipopolysaccharide (TNP-LPS)], a T-cell-independent type 2 [dinitrophenyl (DNP)-Ficoll], and a T-cell-dependent [DNP-keyhole limpet hemocyanin (KLH)] antigen were assessed in CD19-/- and hCD19TG mice. B cells from CD19-/- mice differentiated and underwent immunoglobulin isotype switching in vitro in response to mitogens and cytokines. In vivo, CD19-/- mice generated humoral responses to TNP-LPS and DNP-KLH that were dramatically lower than those of wild-type littermates. Surprisingly, the humoral response to DNP-Ficoll was significantly greater in CD19-/- mice. In contrast, hCD19TG mice were hyperresponsive to TNP-LPS and DNP-KLH immunization but were hyporesponsive to DNP-Ficoll. These results demonstrate that CD19 is not required for B-cell differentiation and isotype switching but serves as a response regulator which modulates B-cell differentiation. Since humoral responses to both T-cell-dependent and T-cell-independent antigens were similarly affected by alterations in CD19 expression, these differences are most likely to result from intrinsic changes in B-cell function rather than from the selective disruption of B-cell interactions with T cells.

Full Text

Duke Authors

Cited Authors

  • Sato, S; Steeber, DA; Tedder, TF

Published Date

  • December 5, 1995

Published In

Volume / Issue

  • 92 / 25

Start / End Page

  • 11558 - 11562

PubMed ID

  • 8524803

Pubmed Central ID

  • PMC40441

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.92.25.11558


  • eng

Conference Location

  • United States