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Infect. Immun., 01 1995, 224-228, Vol 63, No. 1
Z Toossi, TG Young, LE Averill, BD Hamilton, H Shiratsuchi and JJ Ellner
We examined the ability of purified protein derivative (PPD) of
Mycobacterium tuberculosis to induce transforming growth factor beta 1
(TGF-beta 1), a potent immunosuppressive and macrophage-deactivating
molecule, in blood monocytes from healthy individuals. TBF-beta 1 activity
in PPD-induced monocyte supernatants was identified by Western immunoblot
analysis and was not inhibited by polymyxin B, an inhibitor of bacterial
lipopolysaccharide (LPS). Furthermore, PPD at equivalent amounts in weight
to LPS was as potent in stimulation of monocyte production of TGF-beta 1 at
24 h of culture, as quantified by enzyme- linked immunosorbent assay. The
inducing effect of PPD, in contrast to that of LPS, was sustained at later
time points of culture (72 h). PPD enhanced the constitutive expression of
TGF-beta 1 steady-state mRNA in monocytes at 24 and 48 h of culture. In
contrast, neither mycobacterial heat shock protein (64-kDa protein of
M.bovis) nor LPS induced TGF-beta 1 mRNA. Decay studies suggested a
transcriptional rather than a posttranscriptional effect of PPD on TGF-beta
1 gene expression.
Copyright © 1995, American Society for Microbiology
Induction of transforming growth factor beta 1 by purified protein derivative of Mycobacterium tuberculosis
Department of Medicine, Case Western Reserve University, Cleveland, Ohio 44106.
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