Demonstration by in situ hybridization of dissimilar IL-1 beta gene expression in human alveolar macrophages and blood monocytes in response to lipopolysaccharide. Academic Article uri icon

Overview

MeSH

  • Genes
  • Humans
  • Pulmonary Alveoli
  • RNA Processing, Post-Transcriptional
  • RNA, Messenger

MeSH Major

  • Gene Expression Regulation
  • Interleukin-1
  • Lipopolysaccharides
  • Macrophages
  • Monocytes
  • Nucleic Acid Hybridization

abstract

  • IL-1 beta is the major form of IL-1 produced by mononuclear phagocytes. To evaluate the possible mechanisms underlying the observation that mature populations of human mononuclear phagocytes as alveolar macrophages are relatively poor IL-1 producers compared with blood monocytes, the expression of the IL-1 beta gene mRNA transcripts was evaluated in LPS-stimulated normal autologous blood monocytes and alveolar macrophages by using a IL-1 beta cDNA probe. Although Northern analysis demonstrated that stimulated monocytes and alveolar macrophages both express 1.8-kb IL-1 beta mRNA transcripts, cytoplasmic dot blot analysis showed that the total IL-1 beta mRNA content in alveolar macrophages was only 38 +/- 5% of that in blood monocytes. In situ hybridization with antisense and sense IL-1 beta RNA probes demonstrated that whereas most of stimulated blood monocytes contained IL-1 beta mRNA transcripts, a significant proportion of autologous alveolar macrophages stimulated in an identical fashion did not express the IL-1 beta gene. Within 4 h after LPS stimulation, IL-1 beta mRNA transcripts were detected in 81 +/- 6% monocytes, whereas only 16 +/- 9% of alveolar macrophages were positive, and by 18 h this had increased only to 43 +/- 15%. Quantification of the size distribution of the IL-1 beta mRNA expressing mononuclear phagocytes demonstrated that, among the population of alveolar macrophages, the cells expressing this gene were not confined to those that were "monocyte-like." These observations demonstrate that there is a heterogeneity among population of mononuclear phagocytes in their ability to express the gene for IL-1 beta, which could explain the differences observed in IL-1 production.

publication date

  • June 1, 1988

has subject area

  • Gene Expression Regulation
  • Genes
  • Humans
  • Interleukin-1
  • Lipopolysaccharides
  • Macrophages
  • Monocytes
  • Nucleic Acid Hybridization
  • Pulmonary Alveoli
  • RNA Processing, Post-Transcriptional
  • RNA, Messenger

Research

keywords

  • Journal Article

Identity

Language

  • eng

PubMed ID

  • 3259599

Additional Document Info

start page

  • 3822

end page

  • 3829

volume

  • 140

number

  • 11