Cell-associated IL-8 in human blood monocytes: Analysis by flow cytometry

Seitaro Fujishima, Hidetoshi Nakamura, Yasuhiro Waki, Kenzo Soejima, Yuji Takeuchi, Motoyuki Ogawa, Masahide Shiozawa, Yoshiki Hiraoka, Takeo Kawashiro, Sadakazu Aiso, Minoru Kanazawa

研究成果: Article査読

8 被引用数 (Scopus)


Several cell-associated cytokines, such as interleukin-1 (IL-1) and tumor necrosis factor, exist on the cell surface and are biologically active. Although extracellular IL-8, a potent chemotactic factor for primarily neutrophils, has been studied extensively, cell-associated IL-8 has barely been studied. In this study, we analyzed the intracellular and cell-surface IL-8 in human blood monocytes in vitro by using flow cytometry and predicted the biological activity of the cell-associated IL-8 in vivo. After fixation with paraformaldehyde, mononuclear cells were divided into two subgroups. One subgroup was left untreated to study cell-associated antigens, and the other subgroup was permeabilized with saponin to detect intracellular antigens. In lipopolysaccharide (LPS)-stimulated monocytes, IL-8 was detected solely intracellularly, whereas both the intracellular and cell-surface IL-1β was detectable. In a time-course study, the intracellular IL-8 increased in response to LPS stimulation, but the cell-surface IL-8 was undetectable throughout he course. In an LPS-stimulated monocytic cell line, both ELISA and flow cytometry detected the quantitative change of the intracellular IL-8. The dissmilar localization between IL-8 and IL-1β within cells was confirmed by the immunohistochemical analysis. In summary, LPS stimulation induced a time-dependent increase in intracellular but not cell-surface IL-8 in monocytes. Thus, it is unlikely that the cell-associated IL-8 is functioning physiologically. The semiquantitative flow cytometric procedure may be useful for simultaneous examination for cell-surface and intracellular cytokines.

出版ステータスPublished - 1996 8月 1

ASJC Scopus subject areas

  • 病理学および法医学
  • 生物理学
  • 血液学
  • 内分泌学
  • 細胞生物学


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