Abstract:
:GM-CSF transgenic mice were crossed with mice with homozygous inactivation of the gene encoding the common beta chain (beta c) of the GM-CSF receptor to produce mice with constitutively elevated GM-CSF levels but no high-affinity GM-CSF receptors. GM-CSF transgenic beta c -/- mice had exceptionally elevated serum GM-CSF levels but failed to develop the abnormal peritoneal cell population, eye destruction or tissue lesions characteristic of GM-CSF transgenic beta c +/+ mice. The alveolar proteinosis of beta c -/- mice was not altered in GM-CSF transgenic beta c -/- mice. Levels of GM-CSF mRNA in transgenic GM-CSF beta c -/- were elevated but lower than in transgenic beta +/+ mice and the higher serum GM-CSF levels were traced in part to the longer serum half-life of GM-CSF in beta c -/- than in beta c +/+ mice although urinary loss of GM-CSF was higher in beta c -/- than in +/+ mice. The data indicate that the transgenic phenotype was due to stimulation by GM-CSF and not an insertional effect, that low-affinity receptors are not capable of initiating tissue pathology even in the presence of excess GM-CSF levels and that autocrine production of GM-CSF by GM-CSF-responsive cells also fails to induce changes in these cells. The results support current dogma that the action of polypeptide regulators is mediated exclusively by activation of high-affinity membrane receptors.
journal_name
Leukemiajournal_title
Leukemiaauthors
Metcalf D,Mifsud S,Di Rago L,Robb L,Nicola NA,Alexander Wdoi
10.1038/sj.leu.2400926subject
Has Abstractpub_date
1998-03-01 00:00:00pages
353-62issue
3eissn
0887-6924issn
1476-5551journal_volume
12pub_type
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