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Cellular interactions in hemopoiesis.

S J Liu1, J L Ascensão, E Podack

  • 1Department of Medicine, New York Medical College, Valhalla 10595.

Blood Cells
|January 1, 1987
PubMed
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Activated immune cells (LAK) and IL-2 therapy impact blood cell production (hemopoiesis). While erythroid progenitors decreased, LAK cells produced burst-promoting activity, suggesting complex effects on anemia and eosinophilia in cancer patients.

Area of Science:

  • Immunology
  • Hematology
  • Cell Biology

Background:

  • The role of immune cells in blood formation (hemopoiesis) is debated.
  • Cancer immunotherapies like LAK/IL-2 involve activated immune cells and cytokines.
  • Understanding therapy-induced hematological changes is crucial for patient management.

Purpose of the Study:

  • To investigate the effects of LAK/IL-2 therapy on hemopoiesis in cancer patients.
  • To determine if LAK cells influence erythroid progenitor activity.
  • To identify potential mediators of hematological changes during LAK/IL-2 treatment.

Main Methods:

  • Utilized an autologous system with activated peripheral blood mononuclear cells (LAK) and interleukin-2 (IL-2).
  • Assessed circulating erythroid progenitors and burst-forming units-erythroid (BFU-E) in culture.

Related Experiment Videos

  • Measured burst-promoting activity (BPA) and colony-stimulating factor (CSF) in LAK cell supernatants.
  • Monitored for circulating eosinophil progenitors (CFU-Eo) and gamma interferon (IF).

    • Main Results:

    • Circulating erythroid progenitors showed minimal changes.
    • LAK cells and supernatants reduced detectable BFU-E in cocultures.
    • LAK cells produced BPA, a hemopoietin, but circulating IF levels were undetectable.
    • Evidence of CSF production by LAK cells led to increased eosinophil colonies from bone marrow.

    Conclusions:

    • LAK/IL-2 administration significantly impacts hemopoiesis.
    • LAK-cell-derived factors may contribute to anemia and eosinophilia observed in patients.
    • Further research is needed to elucidate the precise mechanisms of LAK/IL-2-mediated hematological effects.