International Immunology, Vol 10, 1289-1298, Copyright © 1998 by Oxford University Press
J Borvak, J Richardson, C Medesan, F Antohe, C Radu, M Simionescu, V Ghetie and ES Ward
Our recent data indicate that the MHC class I-related receptor, FcRn, plays
a role in regulating serum IgG levels, in addition to its known role in
transferring IgG from mother to young. In the current study, the
distribution of FcRn in adult mice has been investigated using several
approaches. First, tissue distribution of anti-FcRn F(ab')2, murine IgG1
and recombinant, IgG1-derived Fc-hinge fragments has been analyzed, and
these FcRn binding proteins localize predominantly in skin and muscle with
lesser amounts in liver and adipose tissue. Second, histochemical analyses
of muscle and liver with anti-FcRn F(ab')2 indicate that FcRn is expressed
in the endothelium of small arterioles and capillaries, but not in larger
vessels such as the central vein and portal vasculature. Third,
immunoprecipitation and immunofluorescence studies of cultured murine
endothelial cells show that functional FcRn is expressed in these cells,
and is located within vesicular structures in the cytosol and not on the
membrane. Taken together the data demonstrate that FcRn is expressed in
functionally active form in endothelial cells, indicating that these cells
are a possible site at which serum IgG homeostasis is maintained.
ARTICLES
Functional expression of the MHC class I-related receptor, FcRn, in endothelial cells of mice
Department of Microbiology and Cancer Immunobiology Center, University of Texas Southwestern Medical Center, Dallas 75235-8576, USA.
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