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. 1985 Feb;82(3):795–799. doi: 10.1073/pnas.82.3.795

Expression of the alpha 1-proteinase inhibitor gene in human monocytes and macrophages.

D H Perlmutter, F S Cole, P Kilbridge, T H Rossing, H R Colten
PMCID: PMC397133  PMID: 3871944

Abstract

Expression of the alpha 1-proteinase inhibitor (alpha 1PI) gene was studied in human mononuclear cells. Using RNA blot and dot hybridization, alpha 1PI mRNA was detected in human peripheral blood monocytes, bronchoalveolar and breast milk macrophages, but not in B or T lymphocytes. Using incorporation of a radiolabeled amino acid precursor, synthesis and secretion of alpha 1PI were demonstrated in human monocytes and macrophages, but not in lymphocytes. In addition, alpha 1PI was secreted in functionally active form as shown by complexing with serine proteases. Biosynthesis of alpha 1PI by mononuclear phagocytes was greatest during the first 24 hr in culture and progressively decreased over the next 10 days. The reduction in alpha 1PI biosynthesis in vitro involved a mechanism acting at the pretranslational level as alpha 1PI mRNA content also progressively declined over 10 days in culture. The ease of sampling human monocytes and macrophages now permits examination of the biochemical defect in homozygous PiZ and PiS alpha 1PI deficiencies and study of the functional significance of locally produced alpha 1PI in normal tissues and sites of injury or inflammation.

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