Abrogation of transforming growth factor-beta type II receptor stimulates embryonic mouse lung branching morphogenesis in culture

Developmental Biology
J ZhaoD Warburton

Abstract

TGF-beta1 is a known inhibitor of branching morphogenesis when added exogenously to mouse embryonic lungs in culture. However, the issue of whether endogenous TGF-beta signaling has a function in the process of lung organogenesis is not completely resolved. We utilized immunoperturbation and antisense oligodeoxynucleotide inhibitory strategies to abrogate TGF-beta type II receptor function in embryonic mouse lungs undergoing branching morphogenesis in serumless explant culture. Antisera directed against a TGF-beta type II receptor N-terminal peptide that perturbs TGF-beta ligand-receptor binding increased branching by 70%. Similarly, antisense TGF-beta type II receptor oligodeoxynucleotides (40 microM) resulted in a 58% increase in branching, compared to scrambled and mismatched sequence controls, while TGF-beta, type II receptor mRNA and its protein expression levels were suppressed by 95 and 84%, respectively. Addition of exogenous TGF-beta1 did not overcome the stimulatory effects either of TGF-beta type II receptor immunoperturbation or of antisense oligodeoxynucleotide treatment on lung branching morphogenesis. Using in situ hybridization and immunohistochemistry, both TGF-beta type II receptor mRNA and protein were locali...Continue Reading

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