Insulin potentiates FcεRI-mediated signaling in mouse bone marrow-derived mast cells

Alexander Kettner, Mario Di Matteo, Angela Santoni

Research output: Contribution to journalArticlepeer-review

Abstract

Factors contained in physiological microenvironments in tissues where mast cells differentiate and reside may influence mast cell responsiveness and modify antigen-dependent activation. A possible direct or indirect role of mast cell responses in diabetes mellitus prompted us to study the impact of insulin treatment on antigen triggered signaling pathways downstream of FcεRI in bone marrow-derived mouse mast cells (BMMCs). We found that insulin alone stimulates tyrosine phosphorylation of tyrosine kinases Lyn, Syk, Fyn, the adapter protein Gab2 (Grb2-associated binding protein 2), Akt and activates ERK, JNK and p38 kinase. Effect of insulin on FcεRI signaling pathways was marked by enhanced phosphorylation of Lyn, Fyn, Gab2 and Akt. Furthermore, BMMC stimulated with antigen in the presence of insulin responded with enhanced protein kinase θ (PKCθ) activity and increased JNK phosphorylation when compared to BMMC triggered with antigen alone. Functional studies reveal enhanced degranulation and altered cytoskeletal rearrangement when BMMCs were treated simultaneously with insulin and antigen. Our results suggest that insulin tunes antigen-mediated responses of mast cells.

Original languageEnglish
Pages (from-to)1039-1046
Number of pages8
JournalMolecular Immunology
Volume47
Issue number5
DOIs
Publication statusPublished - Feb 2010

Keywords

  • Cell activation
  • Co-stimulation
  • Fc receptors
  • IgE
  • Insulin
  • Mast cell
  • Signal transduction

ASJC Scopus subject areas

  • Molecular Biology
  • Immunology

Fingerprint

Dive into the research topics of 'Insulin potentiates FcεRI-mediated signaling in mouse bone marrow-derived mast cells'. Together they form a unique fingerprint.

Cite this