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Related Experiment Video

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Author Spotlight: Development of a Method for Identifying Small Molecular Antagonists of β2 Integrin Activation

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Identification of Inhibitors of Integrin Cytoplasmic Domain Interactions With Syk.

Deenadayalan Bakthavatsalam¹, John W Craft^1,2, Anna Kazansky¹

¹Molecular Cardiology Research Laboratories, Texas Heart Institute, Houston, TX, United States.

Frontiers in Immunology

|January 25, 2021

Summary

Novel beta-lactam antibiotics, cefsulodin and ceftazidime, inhibit spleen tyrosine kinase (Syk) and integrin interactions. This approach targets inflammation by blocking specific Syk signaling pathways without affecting other critical immune functions.

Keywords:

cell adhesion high-throughput screening immune response receptor inflammation integrin signaling tyrosine kinase β-lactam antibiotics

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Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes

Published on: June 13, 2014

Area of Science:

Immunology
Molecular Biology
Pharmacology

Background:

Leukocyte inflammatory responses depend on spleen tyrosine kinase (Syk) signaling.
Syk is activated through interactions with integrin cell-adhesion molecules.
Targeting Syk is crucial for managing inflammatory conditions.

Purpose of the Study:

To identify small molecules inhibiting Syk-integrin cytoplasmic domain interactions.
To explore a novel therapeutic strategy for inflammation by modulating Syk signaling.

Main Methods:

Developed a high-throughput screen to identify Syk-integrin inhibitors.
Screened compound libraries, including beta-lactam antibiotics.
Utilized molecular modeling to understand inhibitor binding.
Assessed the impact of inhibitors on integrin signaling and cytokine production.

Main Results:

Identified cefsulodin and ceftazidime as inhibitors of Syk-integrin binding (IC50 range, 1.02-4.9 µM).
Demonstrated that ceftazidime inhibits adhesion-dependent upregulation of IL-1β and MCP-1 via Syk.
Showed that these compounds inhibit Syk without affecting FcγRI-mediated ITAM-dependent phosphorylation.
Confirmed novel binding sites for inhibitors outside the Syk kinase and pITAM domains.

Conclusions:

Ceftsulodin and ceftazidime offer a novel method to target Syk-integrin signaling.
This approach selectively abrogates integrin-mediated Syk signaling while preserving ITAM-dependent pathways.
This represents a promising strategy for developing new anti-inflammatory therapies.