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The Journal of Immunology, 2005, 174: 4034-4042.
Copyright © 2005 by The American Association of Immunologists

Increased Expression of CD27 on Activated Human Memory B Cells Correlates with Their Commitment to the Plasma Cell Lineage1

Danielle T. Avery*, Julia I. Ellyard*,{dagger}, Fabienne Mackay{ddagger}, Lynn M. Corcoran§, Philip D. Hodgkin§ and Stuart G. Tangye2,*

* Centenary Institute of Cancer Medicine and Cell Biology, and {dagger} University of Sydney, Sydney, New South Wales, Australia; {ddagger} Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia; and § Walter and Eliza Hall Institute of Medical Research, Royal Melbourne Hospital, Victoria, Australia

Plasma cells (PC) or Ig-secreting cells (ISC) are terminally differentiated B cells responsible for the production of protective Ig. ISC can be generated in vitro by culturing human B cells with the T cell-derived stimuli CD40L, IL-2, and IL-10. ISC have traditionally been identified by the increased expression of CD38, analogous to primary human PC, and the acquired ability to secrete Ig. By tracking the proliferation history of activated B cells, we previously reported that the differentiation of memory B cells into CD38+ B cells is IL-10 dependent, and increases in frequency with cell division. However, <50% of CD38+ cells secreted Ig, and there was a population of CD38 ISC. Thus, the PC phenotype of CD38+ cells generated in vitro did not correlate with PC function. To address this, we have examined cultures of activated memory B cells to accurately identify the phenotype of ISC generated in vitro. We found that CD27 is also up-regulated on memory B cells in an IL-10-dependent and division-dependent manner, and that ISC segregated into the CD27high subset of activated memory B cells irrespective of the acquired expression of CD38. The ISC generated in these cultures expressed elevated levels of the transcription factors Blimp-1 and X box-binding protein-1 and reduced levels of Pax-5, and exhibited selective migration toward CXCL12, similar to primary PC. We propose that the differentiation of memory B cells into PC involves a transitional stage characterized by a CD27highCD38 phenotype with the acquired ability to secrete high levels of Ig.




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