Evidence for the involvement of galectin-3 in mesenchymal stem cell suppression of allogeneic T-cell proliferation.

Abstract:

:Human bone marrow-derived mesenchymal stem cells (MSC) are multipotent non-hematopoietic progenitors that have regulatory activity on immune cells. NOD- and Toll-like receptors (NLR, TLR) have several roles in immunity, including those relevant to pathogen recognition and shaping the course of immune responses by controlling gene expression. We have shown that these innate immune receptors are expressed by hematopoietic CD34+ progenitors and MSC. To uncover genes critical in MSC function, first we have used microarray to screen for potential transcripts whose levels are altered in response to NOD-1 and TLR-2 activation, and second we validated some candidate genes using real-time RT-PCR, Western blots and cellular assays. Amongst the altered genes, galectin-3 was upregulated at both mRNA and protein levels in response to TLR-2 activation. Interestingly, MSC secreted galectin-3, a protein known to modulate T-cell proliferation, gene expression, cell adhesion and migration. Knockdown of galectin-3 in MSC using small interfering RNA (siRNA) reduced the immunosuppressive effect of MSC on mixed lymphocyte cultures when compared to cells treated with an irrelevant siRNA (P < 0.05). Collectively, the data emphasize a new role of galectin-3 in the immunomodulatory function of MSC and indicate that NOD signalling pathway is also functional in these cells.

journal_name

Scand J Immunol

authors

Sioud M,Mobergslien A,Boudabous A,Fløisand Y

doi

10.1111/j.1365-3083.2010.02378.x

subject

Has Abstract

pub_date

2010-04-01 00:00:00

pages

267-74

issue

4

eissn

0300-9475

issn

1365-3083

pii

SJI2378

journal_volume

71

pub_type

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