Abstract
Previous studies suggest that members of the fibroblast growth factor (FGF) family are mitogenic to mammary epithelium. In order to determine expression of acidic and basic FGF (aFGF and bFGF) during mammary development, mice were euthanized as virgins, early pregnant, mid-pregnant, late-pregnant, or during early lactation. Mammary expression of both aFGF and bFGF mRNA increased through pregnancy. Acidic FGF mRNA continued to increase during early lactation, but basic FGF message level decreased drastically during early lactation. Western blots probed with anti-aFGF showed four immunoreactive bands approx 30, 48, 52, and 55-kDa in size. The 30-, 48-, and 55-kDa bands for aFGF were expressed at low levels during virgin and early pregnant stages but were more prominent during the later stages. The 52-kDa band was high during the virgin and early pregnant stages and low in mid-pregnancy through early lactation. Blots probed with anti-bFGF showed two bands approx 30 and 50 kDa in size. Both bands increased through early-pregnancy, but during late-pregnancy there was a decrease in immunoreactive protein levels, which remained low during early lactation. Experiments to determine where FGF mRNAs are produced in the mammary gland suggest that both FGFs may be produced in the stroma, leading to the hypothesis that aFGF and bFGF are stromally produced growth factors and probably act on the epithelial component of the gland in a paracrine fashion.
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Chakravorti, S., Sheffield, L. Acidic and basic fibroblast growth factor mRNA and protein in mouse mammary glands. Endocr 4, 175–182 (1996). https://doi.org/10.1007/BF02782762
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DOI: https://doi.org/10.1007/BF02782762