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Journal of Molecular Medicine

, Volume 94, Issue 2, pp 183–194 | Cite as

Inhibition of AMPK through Lyn-Syk-Akt enhances FcεRI signal pathways for allergic response

  • Kai-Chun Lin
  • Duen-Yi Huang
  • De-Wei Huang
  • Shiang-Jong Tzeng
  • Wan-Wan Lin
Original Article

Abstract

AMPK was shown to negatively regulate FcεRI activation, and FcεR-mediated Fyn activation can counteract the LKB1/AMPK axis in mast cells. However, the relationship between the major Src family kinase Lyn and AMPK remains poorly defined. Here, we investigate the molecular mechanism for AMPK inhibition by FcεRI-Lyn signaling in rat RBL-2H3 cells. We found that FcεRI activation could rapidly inhibit AMPK activation through increased AMPK phosphorylation at the inhibitory Ser485/491 residues without a change at the activating Th172 residue, and this was accompanied by a reduction of ACC phosphorylation. Using specific inhibitors and gene silencing, we found that such AMPK inhibition involved a signaling cascade through Lyn-Syk-Akt. When AMPK was activated by AICAR, A769662 and metformin, FcεRI-mediated Syk, ERK, JNK and p38 activation, and TNFα release were all inhibited. Consistently, AMPK inhibition by compound C increased FcεRI-mediated Lyn activation. Moreover, AMPK activation dominantly impaired IgE-induced recruitment of signal proteins to the FcεRI by blocking the formation of FcεRIβ-Lyn-Syk, FcεRIγ-Lyn-Syk, and AMPK-FcεRIβ complexes. In vitro kinase assay further revealed the ability of AMPKα2 to phosphorylate FcεRIβ in the complex. In vivo, AMPK activation by metformin could readily reduce vascular permeability and ear swelling in a mouse model of passive cutaneous anaphylaxis mediated by IgE. In summary, our findings demonstrate that IgE-mediated FcεRI activation results in AMPK inhibition through activation of Lyn-Syk-Akt pathway, and as such FcεRI receptor can efficiently propagate Lyn-mediated allergic signaling and response. These results provide important insights into the use of AMPK activators for the treatment of allergic diseases.

Key messages

  • AMPK is inhibited by FcεRI via Lyn-Syk-Akt signaling in RBL-2H3 cells.

  • AMPK inhibition supports FcεRI-mediated Lyn signaling and allergic response.

  • Metformin has inhibitory effect on passive cutaneous anaphylaxis.

Keywords

AMPK FcεRI Syk Akt Basophils Anaphylaxis 

Abbreviations

Ag

Antigen

AICAR

5-Aminoimidazole-4-carboxamide-ribonucleotide

AMPK

AMP-activated protein kinase

BMMC

Bone marrow-derived mast cells

DNP-BSA

2,4-Dinitrophenylated bovine serum albumin

FcεRI

Fcepsilon receptor I

GST

Glutathione S-transferase

HSA

Human serum albumin

IgE

Immunoglobulin E

ITAM

Immunoreceptor tyrosine-based activation motif

LAT

Linker for activation of T cell

LKB1

Liver kinase B1

MAPK

Mitogen-activated protein kinase

PCA

Passive cutaneous anaphylaxis

PLCγ

Phospholipase Cγ

PTK

Protein tyrosine kinase

SFK

Src family kinase

siRNA

Small interfering RNA

Syk

Spleen tyrosine kinase

Notes

Acknowledgments

This work was supported by a grant from the Ministry of Science and Technology (MOST 103-2320-B-002-069 -MY3).

Conflict of interest

The authors declare that they have no competing interests.

Supplementary material

109_2015_1339_MOESM1_ESM.pdf (264 kb)
ESM 1 (PDF 264 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Kai-Chun Lin
    • 1
  • Duen-Yi Huang
    • 1
  • De-Wei Huang
    • 1
  • Shiang-Jong Tzeng
    • 1
  • Wan-Wan Lin
    • 1
    • 2
  1. 1.Department of Pharmacology, College of MedicineNational Taiwan UniversityTaipeiTaiwan
  2. 2.Graduate Institute of Medical SciencesTaipei Medical UniversityTaipeiTaiwan

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