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. 1993 Jan;142(1):49–58.

Expression of transforming growth factor-beta isoforms in small round cell tumors of childhood. An immunohistochemical study.

B K McCune 1, K Patterson 1, R S Chandra 1, S Kapur 1, M B Sporn 1, M Tsokos 1
PMCID: PMC1886834  PMID: 8380955

Abstract

The transforming growth factor (TGF)-betas are a highly conserved group of potent multifunctional cell regulatory proteins with variable effects on cell growth and differentiation. Most of the small round cell group of childhood tumors are thought to arise from either primitive mesenchyme or neuroectoderm and show evidence of skeletal muscle or neural differentiation, and rarely both. To investigate the possibility that the TGF-betas have a role in the growth or differentiation of these neoplasms, we used antibodies specific for peptide sequences of the three known mammalian TGF-beta isoforms (TGF-betas 1, 2, and 3) to probe for TGF-beta protein expression in a total of 49 cases. TGF-beta 1 immunoreactivity was present in 16/17 (94%) of rhabdomyosarcomas, and the staining intensity was usually strong. TGF-beta 1 was also present in three of three ectomesenchymomas. In contrast, TGF-beta 1 was absent in all but one out of nine poorly differentiated neuroblastomas. Differentiating neuronal cells of ganglioneuroblastomas, however, were strongly positive for TGF-beta 1. Ewing's sarcomas and peripheral primitive neuroectodermal tumors had a less consistent, but usually positive, staining pattern. TGF-beta 3 staining patterns were very similar to those of TGF-beta 1. TGF-beta 2 immunoreactivity was only rarely detected in this group of tumors. The results suggest different roles for TGF-betas 1 and 3 in neuroblastoma and rhabdomyosarcoma. Expression of TGF-betas 1 and 3 is associated with neuronal differentiation of neuroblastoma. In contrast, these proteins may promote the growth of rhabdomyosarcoma by suppressing differentiation.

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Selected References

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