Cytokines Regulate Cysteine Cathepsins During TLR Responses

Overview

Journal Cell Immunol

Publisher Elsevier

Specialties Allergy & Immunology
Cell Biology

Date 2010 Dec 15

PMID 21145045

Citations 25

Authors

Blaine M Creasy

Kathleen L McCoy

Affiliations

Soon will be listed here.

Abstract

TLR activation is an important component of innate immunity but also contributes to the severity of inflammatory diseases. Cysteine cathepsins (Cat) B, L and S, which are endosomal and lysosomal proteases, participate in numerous physiological systems and are upregulated during various inflammatory disorders and cancers. Macrophages have the highest cathepsin expression and are major contributors to inflammation and tissue damage during chronic inflammatory diseases. We investigated the impact of TLR activation on macrophage Cat B, L and S activities using live-cell enzymatic assays. TLR2, TLR3 and TLR4 ligands increased intracellular activities of these cathepsins in a differential manner. TLR4-induced cytokines increased proteolytic activities without changing mRNA expression of cathepsins or their endogenous inhibitors. Neutralizing antibodies recognizing TNF-α, IL-1β and IFN-β differentially eliminated cathepsin upregulation. These findings indicate cytokines induced by MyD88-dependent and -independent signaling cascades regulate cathepsin activities during macrophage responses to TLR stimulation.

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