Expression of interleukin-10 in isolated CD8+ T cells and monocytes from growth factor-mobilized peripheral blood stem cell products: A mechanism of immune dysfunction

Michelle L. Varney, Kazuhiko Ino, Ana G. Ageitos, Dean G. Heimann, James E. Talmadge, Rakesh K. Singh

Research output: Contribution to journalArticle

16 Scopus citations


Previous reports showed the abnormal activation of immune cells in growth factor-mobilized peripheral blood stem cell (PBSC) products, which might be responsible for depressed T cell responsiveness to mitogens compared with normal peripheral blood mononuclear cells (PBMC). In the present study, the mRNA expression levels of interleukin (IL)-2, IL-4, IL-10, and interferon-γ (IFN-γ) were significantly higher in CD4+ and CD8+ T cells from mobilized PBSC products compared with CD4+ and CD8+ cells from normal peripheral blood (PB). The mRNA expression levels of IL-4 and IL-10 were significantly higher in CD8+ compared with CD4+ cells from PBSC products. However, the expression of IL-2 and IFN-γ mRNA transcripts was similar in the CD4+ and CD8+ T cells from PBSC products. The levels of IL-10, IL-8, and tumor necrosis factor (TNF)-α mRNA were also significantly higher in monocytes isolated from PBSC products compared with monocytes isolated from normal PB. Expression of IL-10-specific mRNA in monocytes also was significantly higher than the levels observed in CD8+ cells from PBSC products. We suggest that both CD4+ and CD8+ cells in the PBSC products are highly activated. However, their response to phytohemagglutinin (PHA) mitogenesis is depressed in part because of IL-10 expression by CD8+ cells and monocytes in addition to the higher levels of monocyte-dependent T cell inhibitory activity. These data demonstrate that aberrant IL-10 expression in the CD8+ T cells and monocytes present in PBSC products may represent a possible mechanism of immune dysfunction in patients after high-dose chemotherapy (HDT) and peripheral blood stem cell transplantation (PBSCT).

Original languageEnglish (US)
Pages (from-to)351-360
Number of pages10
JournalJournal of Interferon and Cytokine Research
Issue number4
StatePublished - 1999

ASJC Scopus subject areas

  • Immunology
  • Cell Biology
  • Virology

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