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Mezquita, J. et al.

Mezquita, Mezquita, Pau, Mezquita,

Characterization of a novel form of angiopoietin-2 (Ang-2B) and expression of VEGF and angiopoietin-2 during chicken testicular development and regression.

The complex process of angiogenesis is controlled by the vascular endothelial growth factor (VEGF) and its receptors and by the recently isolated angiopoietin-1 (Ang-1) and angiopoietin-2 (Ang-2) that signal through the transmembrane endothelial receptor tyrosine kinase Tie2. We report here the characterization of a novel form of Ang-2 (Ang-2B) with a truncated amino-terminal domain resulting from an alternative splicing of the gene. While previous reports have found the expression of Ang-2 limited to the embryo, female reproductive organs, and tumor tissues, we have observed striking changes in Ang-2 expression during chicken testicular development and regression. The expression of Ang-2 and VEGF is abundant in prepuberal testis and low in quiescent adult testis. Testicular regression is accompanied by high expression of Ang-2 and very low expression of VEGF. These observations are in accordance with the proposal that Ang-2 induces angiogenesis in the presence of VEGF and vascular regression in its absence.[1]

References

Characterization of a novel form of angiopoietin-2 (Ang-2B) and expression of VEGF and angiopoietin-2 during chicken testicular development and regression. Mezquita, J., Mezquita, B., Pau, M., Mezquita, C. Biochem. Biophys. Res. Commun. (1999) [Pubmed]

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