Crosslinking of the cell surface immunoglobulin (mu-surrogate light chains complex) on pre-B cells induces activation of V gene rearrangements at the immunoglobulin kappa locus. |
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Authors: | T Tsubata R Tsubata M Reth |
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Institution: | Max-Planck-Institut für Immunbiologie, Freiburg, Germany. |
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Abstract: | We constructed an expression vector encoding a truncated Ig mu chain that lacks both VH and CH1 domains (mu delta m chain) and introduced the mu delta m vector into the Ig negative Abelson pre-B cell line P17-27. The transfectants expressed a large amount of the mu delta m chain on their surface, which was not complexed with the lambda 5 and VpreB surrogate light chain molecules. While P17-27 transfected with a vector for the intact micron chain (P17-27 micron) shows V kappa rearrangements in culture, V kappa rearrangements were not detected in P17-27 mu delta m cells. When the mu delta m chains on the cell surface were crosslinked by anti-mu antibodies, V kappa gene rearrangements were induced in P17-27 mu delta m. These results strongly suggest that crosslinking of the micron-lambda 5-VpreB complex on the pre-B cell surface generates a signal that activates V kappa gene rearrangement, and that the lambda 5 and VpreB molecules are necessary for the spontaneous crosslinking of surface Ig on pre-B cells. |
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Keywords: | signaling 5" target="_blank">gif" ALT="{lambda}" BORDER="0">5 VpreB B cell development truncated µ chain |
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