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in Hematopoietic Stem Cell Development and B Lymphocyte Maturation in the Male Mouse1
Department of Environmental Medicine, University of Rochester (T.S.T., F.G.M., T.A.G.), Rochester, New York 14642; Department of Microbiology and Immunology, State University of New York Health Science Center (J.E.S., A.E.S.), Syracuse, New York 13210; and National Institute of Environmental and Health Sciences (K.S.K.), Research Triangle Park, North Carolina 27709
Address all correspondence and requests for reprints to: Dr. Tom Gasiewicz, Department of Environmental Medicine, University of Rochester, 575 Elmwood Avenue, Box EHSC, Rochester, New York 14642. E-mail: Tom_Gasiewicz{at}urmc.rochester.edu
Although estrogens and estrogen receptors (ERs) are known to function
in the male brain and reproductive tract, few studies have evaluated
their involvement in the male hematopoietic and immune systems. This
study was undertaken to determine the role of ER
in hematopoietic
progenitor and B lymphocyte maturation. ER
knockout
(ER-/-), wild-type (ER+/+), and
radiation chimeric (ER
positive or negative in either
nonhematopoietic or hematopoietic elements, or both) male mice were
used to determine target tissues. ER-/- and
ER+/+ animals showed similar hematopoietic progenitor
profiles, but the ER-/- animals had fewer
cells in all bone marrow B lymphocyte subpopulations. Animals receiving
a pharmacological dose (5 mg/kg BW) of 17ß-estradiol (E2)
with both elements, ER+/+, had decreased early
hematopoietic progenitors and a shift toward a mature B cell
subpopulation, whereas animals with both elements,
ER-/-, showed changes only in early
hematopoietic progenitors. Hematopoietic element ER+/+
animals exhibited greater E2-induced hematopoietic
progenitor and B lymphocyte alterations than those having only
nonhematopoietic ER
. These data indicate that 1) ER
is not
necessary for regulating male mouse normal hematopoietic progenitor
cell proportions, but is involved in B cell regulation; and 2) ER
in
hematopoietic elements is predominantly responsible for mediating
E2-induced hematopoietic and B cell changes.
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