Journal article
Deregulation of c-Myc Confers distinct survival requirements for memory B cells, plasma cells, and their progenitors
The Journal of immunology (1950), Vol.181(11), pp.7537-7549
12/01/2008
DOI: 10.4049/jimmunol.181.11.7537
PMCID: PMC2841033
PMID: 19017943
Abstract
Deregulation of the c-Myc oncogene is tightly associated with human and murine plasma cell (PC) neoplasms. Through the analysis of Ag-specific B cell responses in mice where Myc is targeted to the Igh Calpha locus, we show here that c-Myc dramatically impairs the primary and secondary Ab response. This impairment is differentiation stage specific, since germinal center B cell formation, affinity maturation, and class switch recombination were intact. Examination of PC viability revealed that c-Myc triggered apoptosis only upon final maturation when Ab is secreted and is resistant to the survival factor BAFF (B cell-activating factor belonging to the TNF family). In contrast, PC precursors (PC(pre)) that ultimately give rise to mature PCs survived normally and vigorously expanded with BAFF signaling. We further show that c-Myc also facilitates the apoptosis of memory B cells. Thus, Calpha-Myc controls both cellular arms of long-lived B cell immunity than previously anticipated. Only when deregulation of c-Myc was combined with enforced Bcl-x(L) expression were mature PCs able to survive in response to BAFF. These data indicate that the survival requirements for tumor-susceptible PC(pre) and PCs are distinct and that tumor progression likely develops as PC(pre) transition to functional PCs when apoptotic pathways such as members of the Bcl-2 family are disabled.
Details
- Title: Subtitle
- Deregulation of c-Myc Confers distinct survival requirements for memory B cells, plasma cells, and their progenitors
- Creators
- Sefat E Khuda - Department of Microbiology, University of Virginia, Charlottesville, VA 22908, USAWilliam M LooSiegfried JanzBrian Van NessLoren D Erickson
- Resource Type
- Journal article
- Publication Details
- The Journal of immunology (1950), Vol.181(11), pp.7537-7549
- DOI
- 10.4049/jimmunol.181.11.7537
- PMID
- 19017943
- PMCID
- PMC2841033
- NLM abbreviation
- J Immunol
- ISSN
- 0022-1767
- eISSN
- 1550-6606
- Grant note
- P20 RR016437 / NCRR NIH HHS P30 CA086862 / NCI NIH HHS P20 RR016437-040006 / NCRR NIH HHS
- Language
- English
- Date published
- 12/01/2008
- Academic Unit
- Pathology
- Record Identifier
- 9984083211502771
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