Heterogeneous nuclear ribonucleoproteins F and H/H' show differential expression in normal and selected cancer tissues

Exp Cell Res. 2004 Mar 10;294(1):199-209. doi: 10.1016/j.yexcr.2003.11.011.

Abstract

The heterogeneous nuclear ribonucleoproteins (hnRNPs) F and H/H', containing the quasi-RNA recognition motif (qRRM) domains, are implicated in several steps of pre-mRNA processing and in cellular differentiation. We have compared a set of tissues and found striking differences in their levels of expression as well as in the nuclear versus the cytoplasmic distribution. Generally, hnRNP F is broadly expressed in many tissues with extremely strong expression in the prostate gland while hnRNP H/H' shows a more restricted degree of expression with low expression in some tissues, for example, liver, exocrine acini of the pancreas, thyroid gland and heart. At the cellular level, hnRNP F is, with few exceptions, predominantly expressed in the cytoplasm while hnRNP H/H' is more abundant in the nuclei. A quite pronounced heterogeneous expression pattern is seen in the proximal tubules of the kidney where hnRNP F is present at moderate cytoplasmic levels while hnRNP H/H' is undetectable, whereas both proteins are more evenly expressed in distal tubules and collecting ducts. Generally, tumor tissues reveal a broad expression of hnRNP F in the nuclei as well as in the cytoplasm while hnRNP H/H' is expressed at higher levels in the nuclei than in the cytoplasm. Up-regulation of hnRNP H/H' is found in a few tissues that normally express low cytoplasmic levels of hnRNP H/H', for example, adenocarcinoma of the pancreas, hepatocellular carcinoma and gastric carcinoma. hnRNP F is down-regulated in hepatocellular carcinoma and up-regulated in gastric carcinoma. The present study indicates the important potential role of this subset of hnRNPs on the gene expression in many tissues.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenocarcinoma / metabolism
  • Adenocarcinoma / pathology
  • Carcinoma, Hepatocellular / metabolism
  • Carcinoma, Hepatocellular / pathology
  • Heterogeneous-Nuclear Ribonucleoprotein Group F-H / immunology
  • Heterogeneous-Nuclear Ribonucleoprotein Group F-H / metabolism*
  • Humans
  • Immunohistochemistry
  • Liver Neoplasms / metabolism
  • Liver Neoplasms / pathology
  • Neoplasms / metabolism*
  • Neoplasms / pathology
  • Pancreatic Neoplasms / metabolism
  • Pancreatic Neoplasms / pathology
  • Tissue Distribution
  • Tumor Cells, Cultured

Substances

  • Heterogeneous-Nuclear Ribonucleoprotein Group F-H