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Vol. 12, Issue 5, 1445-1455, May 2001
B (NF-
B) Regulates Proliferation and
Branching in Mouse Mammary Epithelium







¶** and
The nuclear factor-
Departments of Microbiology and Immunology, *Cell
Biology, § Hematology and Oncology, and
#Cancer Biology, Vanderbilt University School of Medicine
and ¶Vanderbilt Ingram Cancer Center, Nashville, Tennessee
37232-2175;
MD Anderson Cancer Center, Baylor College of
Medicine, Houston, Texas 77030; and **Executive Office of the
President, Office of Science and Technology Policy, Washington, DC
20500
B (NF-
B) family of transcription factors
has been shown to regulate proliferation in several cell types. Although recent studies have demonstrated aberrant expression or
activity of NF-
B in human breast cancer cell lines and tumors, little is known regarding the precise role of NF-
B in normal proliferation and development of the mammary epithelium. We
investigated the function of NF-
B during murine early postnatal
mammary gland development by observing the consequences of increased
NF-
B activity in mouse mammary epithelium lacking the gene encoding
I
B
, a major inhibitor of NF-
B. Mammary tissue containing
epithelium from inhibitor
B
(I
B
)-deficient female donors
was transplanted into the gland-free mammary stroma of wild-type mice,
resulting in an increase in lateral ductal branching and pervasive
intraductal hyperplasia. A two- to threefold increase in epithelial
cell number was observed in I
B
-deficient epithelium compared with
controls. Epithelial cell proliferation was strikingly increased in
I
B
-deficient epithelium, and no alteration in apoptosis was
detected. The extracellular matrix adjacent to I
B
-deficient
epithelium was reduced. Consistent with in vivo data, a fourfold
increase in epithelial branching was also observed in purified
I
B
-deficient primary epithelial cells in three-dimensional
culture. These data demonstrate that NF-
B positively regulates
mammary epithelial proliferation, branching, and functions in
maintenance of normal epithelial architecture during early postnatal development.
These authors contributed equally to this work.
@
Corresponding author. E-mail address:
Lynn.Matrisian{at}mcmail.vanderbilt.edu.
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