An advanced culture method for generating large quantities of highly pure dendritic cells from mouse bone marrow.

Several glycoproteins that control blood-cell production and function have been purified and sequenced. The four colony-stimulating factors interact in a complex way to regulate the differentiation and maturation of the granulocyte and macrophage lineages and have potential applications for the clinical manipulation of blood-cell production.

The molecular control of cell division, differentiation commitment and maturation in haemopoietic cells

Neutrophil kinetics in health and disease

Mice homozygous for a disrupted granulocyte/macrophage colony-stimulating factor (GM-CSF) gene develop normally and show no major perturbation of hematopoiesis up to 12 weeks of age. While most GM-CSF-deficient mice are superficially healthy and fertile, all develop abnormal lungs. There is extensive peribronchovascular infiltration with lymphocytes, predominantly B cells. Alveoli contain granular eosinophilic material and lamellar bodies, indicative of surfactant accumulation. There are numerous large intraalveolar phagocytic macrophages. Some mice have subclinical lung infections involving bacterial or fungal organisms, occasionally with focal areas of acute purulent inflammation or lobar pneumonia. Some features of this pathology resemble the human disorder alveolar proteinosis. These observations indicate that GM-CSF is not essential for the maintenance of normal levels of the major types of mature hematopoietic cells and their precursors in blood, marrow, and spleen. However, they implicate GM-CSF as essential for normal pulmonary physiology and resistance to local infection.

https://www.pnas.org/content/pnas/91/12/5592.full.pdf

Granulocyte/macrophage colony-stimulating factor-deficient mice show no major perturbation of hematopoiesis but develop a characteristic pulmonary pathology

The in vivo function of murine granulocyte-macrophage colony-stimulating factor (GM-CSF) was investigated in mice, carrying a null allele of the GM-CSF gene, that were generated by gene targeting techniques in embryonic stem cells. Although steady-state hematopoiesis was unimpaired in homozygous mutant animals, all animals developed the progressive accumulation of surfactant lipids and proteins in the alveolar space, the defining characteristic of the idiopathic human disorder pulmonary alveolar proteinosis. Extensive lymphoid hyperplasia associated with lung airways and blood vessels was also found, yet no infectious agents could be detected. These results demonstrate that GM-CSF is not an essential growth factor for basal hematopoiesis and reveal an unexpected, critical role for GM-CSF in pulmonary homeostasis.

https://science.sciencemag.org/content/sci/264/5159/713.full.pdf

Involvement of granulocyte-macrophage colony-stimulating factor in pulmonary homeostasis

Hemopoietic responses in mice injected with purified recombinant murine GM-CSF.

Purification and properties of bacterially synthesized human granulocyte-macrophage colony stimulating factor

Recombinant murine GM-CSF produced in Escherichia coli was purified to homogeneity and tested in parallel with purified native GM-CSF. Both recombinant and native GM-CSF stimulated granulocyte and/or macrophage colony formation by adult and fetal mouse progenitor cells, and with adult marrow cells the specific activity of the recombinant GM-CSF (25 X 10(8) U/mg) was similar to that of the native form (15 X 10(8) U/mg). At high concentrations (greater than 200 U/ml), both forms of GM-CSF also stimulated eosinophil colony formation by adult marrow cells and, at very high concentrations (greater than 800 U/ml), megakaryocyte and some erythroid and mixed-erythroid colony formation. Recombinant GM-CSF was as effective in stimulating the proliferation of the GM-CSF-dependent cell line FD as the native molecule. Both recombinant and native GM-CSF were able to induce partial differentiation in colonies of WEHI-3B myeloid leukemic cells. Recombinant GM-CSF competed effectively for the binding of 125I-labeled native GM-CSF to hemopoietic cells, and antiserum to recombinant GM-CSF also neutralized the biological activity of native GM-CSF. The bacterially synthesized GM-CSF was a slightly more effective stimulus for megakaryocyte colony formation than the native molecule. The demonstration that purified bacterially synthesized GM-CSF is biologically active in vitro now permits studies to be undertaken on the in vivo effects of this material.

In vitro actions on hemopoietic cells of recombinant murine GM-CSF purified after production in Escherichia coli: comparison with purified native GM-CSF.

J.-J. Mermod

Papers

Hemopoietic responses in mice injected with purified recombinant murine GM-CSF.

Purification and properties of bacterially synthesized human granulocyte-macrophage colony stimulating factor

In vitro actions on hemopoietic cells of recombinant murine GM-CSF purified after production in Escherichia coli: comparison with purified native GM-CSF.