HGAL, a lymphoma prognostic biomarker, interacts with the cytoskeleton and mediates the effects of IL-6 on cell migration.

Abstract:

:HGAL is a newly identified germinal center (GC)-specific gene whose expression by the tumor cells correlates with a favorable prognosis in patients with diffuse large B-cell and classical Hodgkin lymphomas. The function of HGAL is unknown. Previous studies demonstrated that HGAL is dispensable for GC formation, immunoglobulin gene class-switch recombination, and somatic hypermutation. Herein, we identify a role for HGAL in the regulation of cell motility. We demonstrate that IL-6 induces the phosphorylation of the C-terminal tyrosine residue of the HGAL protein via the Lyn kinase, and promotes its relocalization from the cytoplasm to podosome-like structures. Further, IL-6-induced HGAL phosphorylation increases its interaction with myosin II and is associated with inhibition of cell migration. Knockdown of endogenous HGAL ameliorates IL-6-induced inhibition of cell migration, whereas overexpression of HGAL imparts inhibitory effects of IL-6 on cell migration. Taken together, our results suggest that HGAL is involved in negative regulation of lymphocyte migration, thus constraining lymphocytes to the GC. Inhibition of lymphocyte migration might contribute to the less aggressive clinical behavior of HGAL-expressing lymphomas.

journal_name

Blood

journal_title

Blood

authors

Lu X,Chen J,Malumbres R,Cubedo Gil E,Helfman DM,Lossos IS

doi

10.1182/blood-2007-04-087775

subject

Has Abstract

pub_date

2007-12-15 00:00:00

pages

4268-77

issue

13

eissn

0006-4971

issn

1528-0020

pii

blood-2007-04-087775

journal_volume

110

pub_type

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