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• W224069907 abstract "Abstract Bone marrow-derived stromal cell monolayers pretreated with recombinant interleukin-4 (IL-4) inhibit the growth of hematopoietic cells. This was demonstrated by inhibition of fresh bone marrow-derived, IL-3- induced soft agar colonies as well as by inhibition of proliferation of IL-3-dependent cell lines and of a Friend virus-transformed erythroleukemic cell line. Pretreatment of stromal cells with IL-4 for five to seven days induced the inhibitory activity. IL-4 could then be removed before “plating” the bone marrow cells in soft agar, indicating that the inhibitory activity did not depend on the action of IL-4 on the precursors of the soft agar colonies. The inhibitory activity appears to be mediated by a soluble factor since inhibition was achieved even if the stromal cell layer was separated from the colony forming cells by an “empty” agar layer. However, supernatants of IL-4- induced stromal cell layers had no detectable inhibitory activity. The inhibitory action of the IL-4-pretreated stromal cell lines was not the result of killing of the precursor cells since it could be reversed if the agar layer containing the colony-forming cells was removed from the stromal cell layer and cultured with IL-3. Hydrocortisone (HC) blocked the inhibitory effect if added either in the IL-4 preincubation phase or during the colony formation stage, implying that HC blocked both induction of the inhibitory activity and its release or its effector function. A homogenous long-term stromal cell line could not be induced to exert the inhibitory activity; partial inhibition could be achieved with pure macrophages stimulated with IL-4 and CSF-1, suggesting that the inhibitory activity induced by IL-4 in mixed stromal cell layers may depend on a complex mechanism involving more than one cell type. Northern analysis of RNA from IL-4-induced and uninduced stromal cells indicated that IL-4 did not upregulate expression of CSF-1 or transforming growth factor-beta (TGF-beta) and only modestly increased expression of tumor necrosis factor, suggesting that these cytokines were not responsible for the inhibitory activity. The capacity of IL-4 to induce inhibitory activity in stromal cell layers suggests that IL-4 may play a role in the regulation of hematopoiesis." @default.
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• W224069907 date "1989-04-01" @default.
• W224069907 modified "2023-09-29" @default.
• W224069907 title "Interleukin-4 induces a substance in bone marrow stromal cells that reversibly inhibits factor-dependent and factor-independent cell proliferation" @default.
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• W224069907 doi "https://doi.org/10.1182/blood.v73.5.1130.1130" @default.
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