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Production of transforming growth factor beta by human T lymphocytes and its potential role in the regulation of T cell growth.

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TLDR
TGF-beta may be an important antigen-nonspecific regulator of human T cell proliferation, and important in T cell interaction with other cell types whose cellular functions are modulated by TGF- beta.
Abstract
This study examines the potential role of transforming growth factor beta (TGF-beta) in the regulation of human T lymphocyte proliferation, and proposes that TGF-beta is an important autoregulatory lymphokine that limits T lymphocyte clonal expansion, and that TGF-beta production by T lymphocytes is important in T cell interactions with other cell types. TGF-beta was shown to inhibit IL-2-dependent T cell proliferation. The addition of picograms amounts of TGF-beta to cultures of IL-2-stimulated human T lymphocytes suppressed DNA synthesis by 60-80%. A potential mechanism of this inhibition was found. TGF-beta inhibited IL-2-induced upregulation of the IL-2 and transferrin receptors. Specific high-affinity receptors for TGF-beta were found both on resting and activated T cells. Cellular activation was shown to result in a five- to sixfold increase in the number of TGF-beta receptors on a per cell basis, without a change in the affinity of the receptor. Finally, the observations that activated T cells produce TGF-beta mRNA and that TGF-beta biologic activity is present in supernatants conditioned by activated T cells is strong evidence that T cells themselves are a source of TGF-beta. Resting T cells were found to have low to undetectable levels of TGF-beta mRNA, while PHA activation resulted in a rapid increase in TGF-beta mRNA levels (within 2 h). Both T4 and T8 lymphocytes were found to make mRNA for TGF-beta upon activation. Using both a soft agar assay and a competitive binding assay, TGF-beta biologic activity was found in supernatants conditioned by T cells; T cell activation resulted in a 10-50-fold increase in TGF-beta production. Thus, TGF-beta may be an important antigen-nonspecific regulator of human T cell proliferation, and important in T cell interaction with other cell types whose cellular functions are modulated by TGF-beta.

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References
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Journal ArticleDOI

Transforming growth factor type beta: rapid induction of fibrosis and angiogenesis in vivo and stimulation of collagen formation in vitro.

TL;DR: Further data are obtained to support a role for TGF-beta as an intrinsic mediator of collagen formation: conditioned media obtained from activated human tonsillar T lymphocytes contain greatly elevated levels of T GF-beta compared tomedia obtained from unactivated lymphocytes.
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Human transforming growth factor-beta complementary DNA sequence and expression in normal and transformed cells.

TL;DR: The cDNA sequence indicates that the 112-amino acid monomeric form of the natural TGF-β homodimer is derived proteolytically from a much longer precursor polypeptide which may be secreted.
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Transforming growth factor-beta in human platelets. Identification of a major storage site, purification, and characterization.

TL;DR: The results show that platelets contain a type beta transforming growth factor, which is distinct from platelet-derived growth factor and elicits 50% of its maximal biological response at concentrations less than 5 x 10(-12) M.
Journal ArticleDOI

Type beta transforming growth factor: a bifunctional regulator of cellular growth.

TL;DR: The data indicate that the effects of TGF-beta on cells are not a function of the peptide itself, but rather of the total set of growth factors and their receptors that is operant in the cell at a given time.
Journal ArticleDOI

T cell growth factor receptors. Quantitation, specificity, and biological relevance

TL;DR: The results indicate that TCGF interacts with activated T cells via a receptor through which it initiates the T cell proliferative response, and the relative magnitude of T cell proliferation induced by a given concentration of TCGF closely paralleled the fraction of occupied receptor sites.
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