Autoantibodies inhibit interleukin-7-mediated proliferation and are associated with the age-dependent loss of pre-B cells in autoimmune New Zealand Black mice

Melinda S. Merchant, Beth A. Garvy, Richard L Riley

Research output: Contribution to journalArticle

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Abstract

Surface IgM+B220+ B cell precursors can be categorized as either leukosialin (CD43/S7) negative (late stage pre-B cells) or positive (pro- B/early pre-B cells). In autoimmune New Zealand Black (NZB) mice, bone marrow small pre-B cells (IgM-CD43-B220+) and pro-B/early pre-B cells (IgM- CD43+B220+) declined significantly with age. In particular, subpopulations of pro-B/early pre-B cells expressing the heat stable antigen (HSA) were found in lower proportions with age. Significant decreases in interleukin-7 (IL-7) colony forming units (CFU) were also seen in NZB mice by 6 to 8 months of age and accompanied alterations in the numbers of pro-B and pre-B cells in bone marrow. Concomitant with reduced numbers of B lineage precursor cells and IL-7 CFU in viva, NZB mice produced serum IgM antibodies that strongly inhibited IL-7 CFU responses in vitro. Two monoclonal IgM antibodies (5G9, 2F5) derived from LPS stimulated 10-month-old NZB splenocytes recognized pre- B cell surface antigens on both pre-B cell lines and on IL-7 stimulated bone marrow pro-B/pre-B cells. However, these monoclonal antibodies (MoAb) failed to significantly stain ex viva bone marrow cells. The 5G9 and 2F5 MoAbs also partially inhibited IL-7 CFU in vitro. These results suggest that NZB bone marrow becomes increasingly deficient in B cell precursors and especially in IL-7 responsive pre-B cells with age. IgM serum antibodies and monoclonal IgM antibodies derived from older NZB mice inhibit pre-B cell growth to IL-7. The production of such autoantibodies may interfere with B cell development in aging NZB mice by preventing IL-7-mediated proliferation.

Original languageEnglish
Pages (from-to)3289-3296
Number of pages8
JournalBlood
Volume87
Issue number8
StatePublished - Apr 15 1996

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Interleukin-7
B-Lymphoid Precursor Cells
New Zealand
Autoantibodies
Cells
Immunoglobulin M
Bone
Stem Cells
Bone Marrow
Monoclonal antibodies
Monoclonal Antibodies
CD43 Antigens
ethyl-2-methylthio-4-methyl-5-pyrimidine carboxylate
Cell growth
Antibodies
Surface Antigens
Serum
Bone Marrow Cells

ASJC Scopus subject areas

  • Hematology

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Autoantibodies inhibit interleukin-7-mediated proliferation and are associated with the age-dependent loss of pre-B cells in autoimmune New Zealand Black mice. / Merchant, Melinda S.; Garvy, Beth A.; Riley, Richard L.

In: Blood, Vol. 87, No. 8, 15.04.1996, p. 3289-3296.

Research output: Contribution to journalArticle

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