Enhanced expression of transforming growth factor-beta isoforms in the neural tube of embryos derived from diabetic mice exposed to cyclophosphamide

Abstract

We analyzed the expression pattern of transforming growth factor-β isoforms (TGF-β1, TGF-β2 and TGF-β3) in the developing brain of embryos derived from the normal and diabetic mice exposed to cyclophosphamide (CP), a cytotoxic teratogen. The CP-treated diabetic embryos showed significantly more TGF-β1 and TGF-β2 immunoreactive cells in the regions of telencephalon and diencephalon in comparison to that of CP-treated non-diabetic embryos. Moreover, no cells expressing TGF-β isoforms were detectable in the developing brain of normal and diabetic embryos. The mRNA expression levels of TGF-β isoforms were found to be significantly increased in the developing brain of CP-treated diabetic embryos compared to that of CP-treated non-diabetic embryos as measured by quantitative real time reverse transcription-polymerase chain reaction. The enhanced expression levels of TGF-β isoforms appear to be associated with the increased frequency of neural tube defects observed in the diabetic embryos exposed to CP. © 2003 Elsevier Ireland Ltd. All rights reserved.