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Development, Vol 113, Issue 3 867-878, Copyright © 1991 by Company of Biologists
JOURNAL ARTICLES |
SD Robinson, GB Silberstein, AB Roberts, KC Flanders and CW Daniel
Department of Biology, Sinsheimer Laboratories, University of California, Santa Cruz 95064.
Transforming Growth Factor-beta 1 (TGF-beta 1) was previously shown to inhibit reversibly the growth of mouse mammary ducts when administered in vivo by miniature slow-release plastic implants. We now report a comparative analysis of three TGF-beta isoforms with respect to gene expression and localization of protein products within the mouse mammary gland. Our studies revealed overlapping expression patterns of TGF-beta 1, TGF-beta 2 and TGF-beta 3 within the epithelium of the actively-growing mammary end buds during branching morphogenesis, as well as within the epithelium of growth-quiescent ducts. However, TGF-beta 3 was the only isoform detected in myoepithelial progenitor cells (cap cells) of the growing end buds and myoepithelial cells of the mature ducts. During pregnancy, TGF-beta 2 and TGF-beta 3 transcripts increased to high levels, in contrast to TGF-beta 1 transcripts which were moderately abundant; TGF-beta 2 was significantly transcribed only during pregnancy. Molecular hybridization in situ revealed overlapping patterns of expression for the three TGF-beta isoforms during alveolar morphogenesis, but showed that, in contrast to the patterns of TGF-beta 1 and TGF-beta 2 expression, TGF-beta 3 is expressed more heavily in ducts than in alveoli during pregnancy. Developing alveolar tissue and its associated ducts displayed striking TGF-beta 3 immunoreactivity which was greatly reduced during lactation. All three isoforms showed dramatically reduced expression in lactating tissue. The biological effects of active, exogenous TGF-beta 2 and TGF-beta 3 were tested with slow-release plastic implants. These isoforms, like TGF-beta 1, inhibited mammary ductal elongation in situ by causing the disappearance of the proliferating stem cell layer (cap cells) and rapid involution of ductal end buds. None of the isoforms were active in inhibiting alveolar morphogenesis. We conclude that under the limited conditions of these tests, the three mammalian isoforms are functionally equivalent. However, striking differences in patterns of gene expression and in the distribution of immunoreactive peptides suggest that TGF-beta isoforms may have distinct roles in mammary growth regulation, morphogenesis and functional differentiation.
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