Tissue distribution of murine hemopoietic growth factor mRNA production

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Abstract
We have studied the tissue distribution of interleukin (IL) and hemopoietic colony-stimulating factor (CSF) transcripts in mice by S1-nuclease protection analysis. Accumulation of several of these mRNAs in response to intravenous injection of lipopolysaccharide (IPS) appears to occur in a tissue-specific fashion. IL-1α transcripts accumulate in spleen and lung; IL-6 transcripts accumulate in kidney, heart, and spleen; granulocyte-macrophage-CSF transcripts accumulate in lung and heart; and granulocyte-CSF transcripts accumulate in heart. Three distinct patterns of in vivo mRNA accumulation were detected: (1) silent—interleukins 2–5 showed no transcripts in either LPS-treated or untreated animals; (2) induced—IL-1α, IL-6, granulocyte-macrophage (GM)-CSF, and G-CSF transcripts were increased in abundance in LPS-injected mice; and (3) constitutive—M-CSF transcripts were found in similar amounts in both untreated and treated mice and were present in all tissues examined.