The salivary scavenger and agglutinin binds MBL and regulates the lectin pathway of complement in solution and on surfaces.

Abstract:

:The salivary scavenger and agglutinin (SALSA), also known as gp340, salivary agglutinin and deleted in malignant brain tumor 1, is a 340-kDa glycoprotein expressed on mucosal surfaces and secreted into several body fluids. SALSA binds to a broad variety of microbes and endogenous ligands, such as complement factor C1q, surfactant proteins D and A, and IgA. Our search for novel ligands of SALSA by direct protein-interaction studies led to the identification of mannan-binding lectin (MBL) as a new binding partner. We observed that surface-associated SALSA activates complement via binding of MBL. On the other hand, soluble SALSA was found to inhibit Candida albicans-induced complement activation. Thus, SALSA has a dual complement activation modifying function. It activates the lectin pathway when bound to a surface and inhibits it when free in the fluid phase. These activities are mediated via a direct interaction with MBL. This suggests that SALSA could target the innate immune responses to certain microorganisms and simultaneously limit complement activation in the fluid phase.

journal_name

Front Immunol

journal_title

Frontiers in immunology

authors

Reichhardt MP,Loimaranta V,Thiel S,Finne J,Meri S,Jarva H

doi

10.3389/fimmu.2012.00205

subject

Has Abstract

pub_date

2012-07-16 00:00:00

pages

205

issn

1664-3224

journal_volume

3

pub_type

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