Elevated levels of transforming growth factor beta messenger RNA and its polypeptide in human hepatocellular carcinoma - PubMed (original) (raw)

. 1991 Aug 1;51(15):4080-3.

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• PMID: 1649698

Elevated levels of transforming growth factor beta messenger RNA and its polypeptide in human hepatocellular carcinoma

N Ito et al. Cancer Res. 1991.

Abstract

Malignant cells in culture express elevated levels of transforming growth factor beta 1 (TGF-beta 1) mRNA and secrete an abundant amount of TGF-beta protein, but little is known about the production of TGF-beta in human malignant tissues in vivo. We estimated the levels of TGF-beta 1 mRNA expression by Northern hybridization and measured TGF-beta protein using a radioreceptor assay in tumor tissues surgically obtained from six patients with hepatocellular carcinoma (HCC). TGF-beta 1 mRNA was expressed at much higher levels in HCC tissues from all the cases compared with normal human liver, suggesting an association of the activated TGF-beta 1 gene transcription with hepatocarcinogenesis. The content of TGF-beta was 207 +/- 121 ng/g wet tissue in the HCC tissue, and it showed correlation with the level of TGF-beta 1 mRNA in the tissue (r = 0.69; P less than 0.05). An immunohistochemical study demonstrated that TGF-beta 1 staining could be observed in HCC cells. These observations suggest that human HCC strongly expresses TGF-beta 1 mRNA in vivo, leading to a high content of TGF-beta protein.

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