Growth regulatory peptide production by human breast carcinoma cells Academic Article Article uri icon


MeSH Major

  • Antineoplastic Combined Chemotherapy Protocols
  • HSP90 Heat-Shock Proteins
  • Neoplasms
  • Proto-Oncogene Proteins


  • The mechanisms by which human breast cancers regulate their own growth have been studied by us in an in vitro model system. We showed that specific growth factors (IGF-I, TGF alpha, PDGF) are secreted by human breast cancer cells. A variety of experiments suggest that they are involved in tumor growth and progression. These activities are induced by estradiol in hormone-dependent breast cancer cells and secreted constitutively by estrogen-independent cells. Concentrates of conditioned medium derived from breast cancer cells can induce the growth of hormone-dependent cells in vivo in athymic nude mice. Hormone-dependent breast cancer cells also secrete TGF beta. TGF beta is growth inhibitory. Growth inhibitors such as antiestrogens or glucocorticoids increase TGF beta secretion. An antiestrogen-resistant mutant of MCF-7 cells does not secrete TGF beta when treated with antiestrogen, but is growth inhibited when treated with exogenous TGF beta. Thus, TGF beta functions as a negative autocrine growth regulator and is probably responsible for some of the growth inhibitory effects of antiestrogens.

publication date

  • January 1988



  • Academic Article


Digital Object Identifier (DOI)

  • 10.1016/0022-4731(88)90076-3

PubMed ID

  • 3290584

Additional Document Info

start page

  • 53

end page

  • 61


  • 30


  • 1-6