Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Baughman, R.P. et al.

Baughman, Lower, Miller, Bejarano, Heffelfinger,

Overexpression of transforming growth factor-alpha and epidermal growth factor-receptor in idiopathic pulmonary fibrosis.

BACKGROUND AND AIM: A recent transgenic mouse model overexpressing transforming growth factor alpha ( TGF-alpha) led to a phenotype of pulmonary fibrosis. In order to validate this mouse as a model for idiopathic pulmonary fibrosis in humans, we studied the expression of TGF-alpha in lung tissue of patients with idiopathic pulmonary fibrosis compared to control lung tissue. METHODS: Tissue from both groups was obtained from operative specimens and immediately formalin-fixed and paraffin embedded. Contiguous four micron sections were prepared for conventional histochemical staining and staining with antibodies to either TGF-alpha or the epidermal growth factor-receptor ( EGF-R). Immunostaining was performed using the Ventana ES automated immunohistochemistry system. Four cell types were examined (vascular endothelium, bronchial epithelium, type 2 pneumocytes, and fibroblasts) and stain activity was scored on a six point scale. RESULTS: Eleven patients with IPF were compared to seven control subjects. TGF-alpha immunoreactivity was significantly higher in the IPF patients than in controls in the vascular endothelium, type 2 pneumocytes, and fibroblasts (P < 0.005). [IPF (4(2-4) Median (Range)) than the controls (0.5(0-2), p < 0.0005).] The differences in EGF-R, one of the receptors for TGF-alpha, between these two patient populations were not as striking. There was a small but significantly greater expression of EGF-R in the bronchial epithelium and type 2 pneumocytes of the IPF patients. CONCLUSIONS: TGF-alpha is overexpressed in patients with IPF, especially in the vascular endothelial cells.[1]

References

Overexpression of transforming growth factor-alpha and epidermal growth factor-receptor in idiopathic pulmonary fibrosis. Baughman, R.P., Lower, E.E., Miller, M.A., Bejarano, P.A., Heffelfinger, S.C. Sarcoidosis, vasculitis, and diffuse lung diseases : official journal of WASOG / World Association of Sarcoidosis and Other Granulomatous Disorders. (1999) [Pubmed]

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