Linked Life Data

15963051

Source:http://linkedlifedata.com/resource/pubmed/id/15963051

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2005-6-20
pubmed:abstractText
Biologically active transforming growth factor beta 1 (TGFbeta1) has been identified at sites of Mycobacterium tuberculosis (MTB) infection in the lung; however, the underlying mechanism(s) for its activation is not clear. Here using an enzyme-linked immunospot assay for TGFbeta1, we show that human blood monocytes (MN) and alveolar macrophages (AM) produce bioactive TGFbeta1 upon stimulation by MTB. However, only MTB-stimulated MN increased TGFbeta1 production on a per cell basis. The frequency of TGFbeta1-producing MN was reduced by an inhibitor of plasmin, bdellin, indicating a role for plasmin pathways in the bioactivation of cytokine. The expression of urokinase plasminogen activator receptor (uPAR) mRNA and both surface and soluble uPAR (CD87) was increased in MTB-activated MN. However, antibody neutralization of uPAR suppressed bioactive TGFbeta1 in MN alone. Thus, the more immature MN, which are continuously recruited to the lung during tuberculosis (TB), have a higher capacity to bioactivate TGFbeta1 by expression of components of the plasmin pathway. Excess production and bioactivation of TGFbeta1 at sites of MTB infection may undermine host immune responses during TB.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0300-9475
pubmed:author
pubmed:issnType
Print
pubmed:volume
61
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
558-65
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
Bioactivation of latent transforming growth factor beta1 by Mycobacterium tuberculosis in human mononuclear phagocytes.
pubmed:affiliation
Division of Infectious Disease, Department of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S., Research Support, N.I.H., Extramural