Expression of protein-tyrosine phosphatases in the major insulin target tissues

Research output: Contribution to journalJournal articleResearchpeer-review

K Norris, F Norris, D H Kono, H Vestergaard, O Pedersen, A N Theofilopoulos, N P Møller

Protein-tyrosine phosphatases (PTPs) are key regulators of the insulin receptor signal transduction pathway. We have performed a detailed analysis of PTP expression in the major human insulin target tissues or cells (liver, adipose tissue, skeletal muscle and endothelial cells). To obtain a representative picture, all tissues were analyzed by PCR using three different primer sets corresponding to conserved regions of known PTPs. A total of 24 different PTPs were identified. A multiprobe RNase protection assay was developed to obtain a semiquantitative measure of the expression levels of selected PTPs. Surprisingly, PTP-LAR, previously suggested to be a major regulator of the insulin receptor tyrosine kinase, was expressed in extremely low levels in skeletal muscle, whereas the related receptor-type PTP-sigma and PTP-alpha were expressed in relatively high levels in all four tissues. The low levels of LAR PTP mRNA in skeletal muscle were further confirmed by Northern blot analysis.
Original languageEnglish
JournalFEBS letters
Volume415
Issue number3
Pages (from-to)243-8
Number of pages6
ISSN0014-5793
Publication statusPublished - 6 Oct 1997

    Research areas

  • Adipose Tissue, Blotting, Northern, DNA Primers, Endothelium, Vascular, Gene Expression Regulation, Enzymologic, Humans, Isoenzymes, Muscle, Skeletal, Placenta, Polymerase Chain Reaction, Protein Tyrosine Phosphatases, RNA Probes, RNA, Messenger, Receptor, Insulin, Receptor-Like Protein Tyrosine Phosphatases, Class 4, Receptors, Cell Surface, Ribonucleases, Signal Transduction

ID: 92192661