TY - JOUR
T1 - Cell surface localization of a 72 kilodalton heat shock protein in retroocular fibroblasts from patients with graves' ophthalmopathy
AU - Heufelder, Armin E.
AU - Wenzel, Bjoern E.
AU - Bahn, Rebecca S.
N1 - Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 1992/4
Y1 - 1992/4
N2 - Heat shock proteins (HSPs) have been implicated in autoimmune disease, although they are generally considered to be intracellular in location. We demonstrate that, under certain circumstances, the inducible intracellular 72 kilodalton HSP can also be detected on the surface of cells. We used cultured retroocular fibroblasts derived from patients with severe Graves' ophthalmopathy (GO) and normal individuals in our studies. Sodium dodecylsulfate polyacrylamide-gel electrophoresis of immunoprecipitated cell lysates, derived from surface-radioiodinated GO cell monolayers, resulted in a single band of appropriate molecular weight on the autoradiogram. Further, a bright cell surface staining pattern was observed when indirect immunofluorescence was performed using the same anti-HSP 72 monoclonal antibody on parallel cell cultures. No cell-surface HSP 72 reactivity was detected in normal retroocular fibroblast monolayers by either method. These results are the first demonstration, by immunoprecipitation of surface-labeled proteins, of HSP expression on the surface of cells. This localization of HSP 72 on the surface of affected cells obtained from patients with an autoimmune disease may have implications concerning the role of this molecule in autoimmunity in general, and particularly in the immune process of GO.
AB - Heat shock proteins (HSPs) have been implicated in autoimmune disease, although they are generally considered to be intracellular in location. We demonstrate that, under certain circumstances, the inducible intracellular 72 kilodalton HSP can also be detected on the surface of cells. We used cultured retroocular fibroblasts derived from patients with severe Graves' ophthalmopathy (GO) and normal individuals in our studies. Sodium dodecylsulfate polyacrylamide-gel electrophoresis of immunoprecipitated cell lysates, derived from surface-radioiodinated GO cell monolayers, resulted in a single band of appropriate molecular weight on the autoradiogram. Further, a bright cell surface staining pattern was observed when indirect immunofluorescence was performed using the same anti-HSP 72 monoclonal antibody on parallel cell cultures. No cell-surface HSP 72 reactivity was detected in normal retroocular fibroblast monolayers by either method. These results are the first demonstration, by immunoprecipitation of surface-labeled proteins, of HSP expression on the surface of cells. This localization of HSP 72 on the surface of affected cells obtained from patients with an autoimmune disease may have implications concerning the role of this molecule in autoimmunity in general, and particularly in the immune process of GO.
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M3 - Article
C2 - 1548335
AN - SCOPUS:0026535812
SN - 0021-972X
VL - 74
SP - 732
EP - 736
JO - Journal of Clinical Endocrinology and Metabolism
JF - Journal of Clinical Endocrinology and Metabolism
IS - 4
ER -