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Inhibition of transforming growth factor alpha stimulation of human squamous cell carcinoma of the head and neck with anti-TGF-α antibodies and tyrphostin

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Abstract

Background: Transforming growth factor alpha (TGF-α) and its receptor (EGF-R) may regulate normal and malignant epithelial cell growth by an autocrine mechanism. We investigated the role of TGF-α in regulating head and neck SCC tumor growth.

Methods: TGF-α and EGF-R levels were measured in 7 SCC cell lines and 14 SCC biopsies by RIA, Scatchard, and Western analysis. TGF-α autocrine stimulation of DNA synthesis in SCC cell lines was assessed by incubation with TGF-α neutralizing antibodies and tyrphostin AG 1478, a selective and potent inhibitor of EGF-R kinase.

Results: All SCC cell lines synthesized TGF-α and expressed elevated EGF-R levels compared to normal keratinocytes. Twelve of the 14 SCC biopsies contained TGF-α protein and 8 had specific EGF-R. Exogenous TGF-α or EGF significantly increased DNA synthesis in 4 of 5 SCC cell lines. TGF-α neutralizing antibodies or tyrphostin AG 1478 reduced DNA synthesis in the two SCC cell lines (FaDu and SCC9) tested.

Conclusions: These results indicate that SCC cell lines and tumors usually synthesize TGF-α, have elevated levels of EGF-R, and are mitogenically stimulated by a TGF-α autocrine system. Selective inhibition of the TGF-α system by EGF-R kinase inhibitors or TGF-α neutralizing antibodies may be useful strategies for treating SCC that overexpress TGF-α and its receptor.

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Solorzano, C.C., Jones, S.C., Pettitjean, M. et al. Inhibition of transforming growth factor alpha stimulation of human squamous cell carcinoma of the head and neck with anti-TGF-α antibodies and tyrphostin. Annals of Surgical Oncology 4, 670–684 (1997). https://doi.org/10.1007/BF02303753

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