| First Author | Taubenheim N | Year | 2012 |
| Journal | J Immunol | Volume | 189 |
| Issue | 7 | Pages | 3328-38 |
| PubMed ID | 22925926 | Mgi Jnum | J:190359 |
| Mgi Id | MGI:5448633 | Doi | 10.4049/jimmunol.1201042 |
| Citation | Taubenheim N, et al. (2012) High rate of antibody secretion is not integral to plasma cell differentiation as revealed by XBP-1 deficiency. J Immunol 189(7):3328-38 |
| abstractText | During B cell terminal differentiation, a complex set of transcription factors interact to drive the phenotypic and functional changes leading to the development of Ab-secreting cells (ASCs). The transcription factor X-box binding protein 1 (XBP-1) is an essential part of one of the branches of the unfolded protein response (UPR). The UPR is induced when a cell has to handle large amounts of proteins, as is the case in ASCs. Although XBP-1 was initially also ascribed an indispensable function in plasma cell development, later studies of B cell-specific deletion reported a much milder consequence of XBP-1 deficiency. Our interest was to determine whether XBP-1 was integral for the differentiation of plasma cells. Using both in vitro and in vivo assays, we found efficient generation of ASCs in the absence of XBP-1. ASCs were present at normal frequencies in resting and immunized mice and displayed a pattern of surface markers typical for plasma cells. The absence of XBP-1 resulted in a reduction but not ablation of Ab secretion and the failure to develop the cellular morphology characteristic of ASCs. Thus, XBP-1 deficiency demonstrates that the gene regulatory program controlling plasma cell differentiation can proceed relatively normally in the absence of high rates of Ig secretion. |
