Summary
In vitro growth and differentiation of granulocyte-macrophage progenitor cells (GM-CFU-C) requires colony-stimulating factors (CSF), and an in vivo role for CSF has also been proposed. Prostaglandins of the E series (PGE) have been reported to serve as negative feedback regulators of myelopoiesis. Here, we report evidence of augmented CSF secretion by mouse peritoneal Mo (macrophages) and bone marrow cells in vitro upon stimulation with various biological response modifiers (BRMs). Optimal induction of CSF secretion occurred after in vitro treatment of peritoneal Mo and mononuclear bone marrow cells with 50 μg/ml poly ICLC (polyriboinosinic-polycytidylic acid poly-L-lysine), 5 μg/ml lipopolysaccharide (LPS), or 500 U/ml interferon (IFNα,β) for 2 days. The in vitro stimulation of CSF secretion was paralleled by an increase in PGE secretion by Mo and bone marrow cells. The PGE secretion could, however, be selectively blocked by preincubating the cells for 3 h with indomethacin (10−7 Mol) leaving CFS production intact. In vivo treatment of mice with either maleic anhydride divinyl ether copolymer (MVE-2; 25 mg/kg) or poly ICLC (2 mg/kg) significantly increased levels of CSF in serum, as well as in culture supernatants of in vivo-treated peritoneal Mo and bone marrow cells. The increase in serum CSF levels and in secretion of CSF by peritoneal Mo and bone marrow cells was followed by a dose-dependent increase in GM-CFU-C, in nucleated bone marrow cells, and in peripheral blood leukocytes. The same BRMs also stimulated the secretion of PGE by in vivo-activated peritoneal Mo, but not by bone marrow cells. Pretreatment of the mice with indomethacin (4 mg/kg) almost completely suppressed PGE secretion by peritoneal Mo, but did not change the CSF secretion by peritoneal Mo or bone marrow cells and had no significant effect on bone marrow cellularity. Therefore, MVE-2 and poly ICLC, in addition to their immunomodulatory activity, can also have stimulatory effects on myelopoiesis, presumably mediated through secretion of CSFs. Protection and/or restoration of bone marrow function could thus either provide the opportunity for more extensive chemotherapy or could increase the number of Mo effector cells available for activation against tumor targets.
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Schlick, E., Hartung, K. & Chirigos, M.A. Comparison of in vitro and in vivo modulation of myelopoiesis by biological response modifiers. Cancer Immunol Immunother 18, 226–232 (1984). https://doi.org/10.1007/BF00205516
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DOI: https://doi.org/10.1007/BF00205516