title: Hormone/growth factor interactions mediating epithelial/stromal communication in mammary gland development and carcinogenesis.
abstract: Epithelial/mesenchymal interactions begin during embryonic development of the mammary gland and continue throughout mammary gland development into adult life. Stromal and epithelial growth factors that may mediate interactions between these compartments of the mammary gland are reviewed. Since mammogenic hormones are the primary regulators of mammary gland development, special consideration is given to hormonal regulation of growth factors in order to explore the integration of hormones and growth factors in the regulation of mammary gland growth and neoplasia. Examination of hormonal regulation of the fibroblast growth factor (FGF)-7/FGFR2-IIIb receptor system in the mammary gland reveals that mammogenic hormones differentially regulate the synthesis of stromal growth factors and their epithelial receptors. These effects serve to optimize the action of estrogen and progesterone on mammary gland development and illustrate that the ratio of these two hormones is critical in regulating this growth factor axis. The role of stromal/epithelial mitogenic microenvironments in modulating the genotype and phenotype of preneoplastic and neoplastic lesions by chemical carcinogens is discussed. Finally, changes in growth factor expression during mammary tumor progression are described to illustrate the relative roles that stromally-derived and epithelial-derived growth factors may play during progression to hormone independent tumor growth.
authors.affiliation: Department of Molecular and Integrative Physiology, Kansas Cancer Institute, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160-7417, USA. wimagawa@kumc.edu
authors.forename: Walter
authors.initials: W
authors.lastname: Imagawa
authors.forename: Vadim K
authors.initials: VK
authors.lastname: Pedchenko
authors.forename: Jennifer
authors.initials: J
authors.lastname: Helber
authors.forename: Hongzheng
authors.initials: H
authors.lastname: Zhang
mesh_terms: D000818:Animals; D002450:Cell Communication / Q000502:physiology*; D002471:Cell Transformation, Neoplastic; D004847:Epithelial Cells / Q000502:physiology*; D005260:Female; D006133:Growth Substances / Q000502:physiology*; D006728:Hormones / Q000502:physiology*; D006801:Humans; D008321:Mammary Glands, Animal / Q000166:cytology / Q000502:physiology*; D008325:Mammary Neoplasms, Experimental / Q000473:pathology / Q000503:physiopathology*; D017154:Stromal Cells / Q000502:physiology*
chemical_list: D006133:Growth Substances; D006728:Hormones