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Updated: Jul 8, 2026

Removal and Replacement of Endogenous Ligands from Lipid-Bound Proteins and Allergens

Removal and Replacement of Endogenous Ligands from Lipid-Bound Proteins and Allergens

Published on: February 24, 2021

Essential role for Gab2 in the allergic response.

H Gu¹, K Saito, L D Klaman

¹Cancer Biology Program, Division of Hematology and Oncology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts 02215, USA hgu@caregroup.harvard.edu.

|July 13, 2001

Summary

Gab2 is crucial for mast cell responses to IgE receptor activation. Mice lacking Gab2 show impaired allergic reactions, highlighting Gab2 as a key activator of PI(3)K signaling in immunity.

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Area of Science:

Immunology
Cell signaling
Molecular biology

Background:

Dos/Gab family proteins act as scaffolds, binding signal relay molecules like Shp-2 and PI(3)K.
These adapters are involved in signal transduction pathways initiated by growth factors, cytokines, and antigen receptors.
While Gab1 knockout mice exhibit embryonic lethality, Gab2 knockout mice are viable.

Purpose of the Study:

To investigate the role of Gab2 in immune responses, specifically in mast cells.
To determine Gab2's function in the signaling cascade initiated by the high-affinity IgE receptor (FcεRI).
To explore the therapeutic potential of targeting Gab2 in allergic diseases.

Main Methods:

Generation and phenotypic analysis of Gab2 knockout (Gab2-/-) mice.
Assessment of mast cell degranulation and cytokine gene expression upon FcεRI stimulation.
Biochemical analysis of PI(3)K signaling pathways in wild-type and Gab2-/- mast cells.

Main Results:

Gab2-/- mice exhibit normal health but show defective mast cell responses to FcεRI activation.
Allergic reactions, including passive cutaneous and systemic anaphylaxis, are significantly impaired in Gab2-/- mice.
FcεRI-dependent PI(3)K signaling pathways are defective in Gab2-/- mast cells, identifying Gab2 as the primary activator of PI(3)K in this context.

Conclusions:

Gab2 is essential for FcεRI-mediated mast cell activation and allergic responses.
Gab2 acts as the principal activator of PI(3)K downstream of FcεRI.
Gab2 and its associated signaling molecules represent potential therapeutic targets for treating allergies.