Loss of receptors for transforming growth factor beta in human T-cell malignancies
- PMID: 8016105
- PMCID: PMC44125
- DOI: 10.1073/pnas.91.13.6002
Loss of receptors for transforming growth factor beta in human T-cell malignancies
Abstract
Ki-1 (CD30)+ cutaneous T-cell lymphomas CTCLs) are slowly progressive lymphomas in which initial spontaneous regression is often observed. To better understand the mechanisms of spontaneous regression and eventual tumor progression in Ki-1+ CTCLs, type beta transforming growth factor (TGF-beta)-mediated growth inhibition of clonally related cell lines derived from two time points, before and after tumor progression, was studied. TGF-beta 1 inhibited colony-forming efficiency (CFE) of a cell line (Mac-1) derived from clinically indolent Ki-1+ CTCLs but failed to inhibit CFE of Mac-2A and -2B cell lines from advanced CTCLs. To determine the basis for TGF-beta 1 resistance in advanced CTCL cells, we looked for possible defects in the expression of cell surface TGF-beta receptors. Mac-1 cells were found to express TGF-beta receptors I and II, which mediate growth inhibition, and the TGF-beta-binding proteoglycan betaglycan. In contrast, receptors I and II were not detected in CTCL lines Mac-2A and -2B even though these cell lines did express betaglycan. Various treatments that unmask or induce TGF-beta receptors in other cells failed to show evidence for these receptors in advanced CTCL cells. Loss of TGF-beta receptor expression in these cells correlated with a marked decrease in TGF-beta receptor II mRNA levels. Loss of cell surface TGF-beta receptors was also found in two of five other patients with T-cell lymphomas including the Sezary syndrome and a noncutaneous T-cell lymphoma, suggesting that loss of TGF-beta receptor expression may be a recurrent feature of human T-cell malignancies.
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