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Breast Cancer Research and Treatment

, Volume 53, Issue 3, pp 217–227 | Cite as

Pattern of distribution of cells positive for estrogen receptor α and progesterone receptor in relation to proliferating cells in the mammary gland

  • J. Russo
  • X. Ao
  • C. Grill
  • I.H. Russo
Article

Abstract

Since cell proliferation is indispensable for the growth and development of the breast, and estrogens are considered to play a major role in promoting cell proliferation, while progesterone influences its differentiation, the present work was designed with the purpose of verifying the relationship between cells containing steroid hormone receptors and proliferating cells in the normal human breast. Twelve breast samples were analyzed for their content of lobules type 1 (Lob1), Lob2, Lob3, and Lob4, and the number of cells containing estrogen receptor alpha (ER-α), progesterone receptor (PgR), or expressing Ki67 antibody was determined by double immunocytochemical technique with specific antibodies. The highest percentage of ER-α, PgR, and Ki67 positive cells was found in Lob1, with a progressive reduction in the more differentiated Lob2 and Lob3. ER-α and PgR positive cells were found exclusively in the breast epithelium and were negative for Ki67, while cells positive for Ki67 did not express receptors. These findings were compared with the distribution of ER-α and PgR in the autoradiographs of mammary gland of young virgin rats inoculated with 3H-thymidine for determination of the DNA labeling index (DNA-LI). Both the DNA-LI and the percentage of ER-α and PgR positive cells were maximal in the epithelium of terminal end buds, and these values were reduced in alveolar buds and lobules. ER-α and PgR positive cells did not proliferate, and those cells that had incorporated 3H-thymidine were negative for both receptors. Our results led us to conclude that the content of ER-α and PgR in the normal mammary tissue varies with the degree of lobular development, in parallel with cell proliferation. However, the expression of receptors occurs in cells other than the proliferating cells, indicating that they represent at least two separate cell populations. These findings open new avenues towards the understanding of the mechanisms through which estrogens and progesterone affect the proliferative activity of breast epithelial cells, and their role in the initiation of the cascade of events that leads a normal cell to cancer.

breast epithelium cell proliferation differentiation estrogen receptors progesterone receptors 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • J. Russo
    • 1
  • X. Ao
    • 1
  • C. Grill
    • 1
  • I.H. Russo
    • 1
  1. 1.Breast Cancer Research Laboratory, Fox Chase Cancer CenterPhiladelphia

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