Preparations of human interferon (HulFN) immune (γ) (2 x 107 units/mg protein), HulFN leukocyte (α) (1.4 x 108 units/mg protein) and HulFN fibroblasts (β) (106 U/mg protein) were assessed for their influence on colony formation of human hematopoietic progenitor cells: colony forming unit-granulocyte, erythroid, macrophage, megakaryocyte (CFU-GEMM), burst forming unit-erythroid (BFU-E), day 7 colony forming unit granulocyte-macrophage (CFU-GM) and day 14 CFU-GM. Colony formation by CFU-GEMM and BFU-E was suppressed equally by the three preparations of HulFN, but colony formation by CFU-GM was suppressed differentially. CFU-GM were, on the whole, more responsive to HulFNγ than HulFNα, and HulFNβ was least effective. HulFNα, but not HulFNγ or HulFNβ, suppressed colony formation from CFU-GM without also suppressing the total number of colonies plus clusters. This was due to an increase in the numbers of clusters formed in the presence of HulFNα. The suppressive influence on colonies from CFU-GM by the preoparations of HulFN and the enhancement of clusters by HulFNα was apparently equal for colonies and clusters of neutrophils, eosinophils, macrophages and neutrophils plus macrophages. The suppressive effects of HulFNγ were inactivated by a monoclonal antibody to HulFNγ and the suppressive and enhancing effects of HulFNα were inactivated with a heteroantiserum to HulFNα. Depletion of monocytes, T lymphocytes and B lymphocytes from the target bone marrow cells had no influence on the effects of the preparations of HulFN. These results demonstrate that the effects of HulFNγ and HulFNα are due to the HulFN themselves and that these actions on the hematopoietic progenitor cells are probably not mediated through monocytes and/or lymphocytes.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of Immunology|
|State||Published - Oct 13 1983|
ASJC Scopus subject areas
- Immunology and Allergy