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2015 ; 106
(1
): 18-24
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gab.com Text
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English Wikipedia
Heat shock protein 90 targets a chaperoned peptide to the static early endosome
for efficient cross-presentation by human dendritic cells
#MMPMID25414129
Tanaka T
; Okuya K
; Kutomi G
; Takaya A
; Kajiwara T
; Kanaseki T
; Tsukahara T
; Hirohashi Y
; Torigoe T
; Hirata K
; Okamoto Y
; Sato N
; Tamura Y
Cancer Sci
2015[Jan]; 106
(1
): 18-24
PMID25414129
show ga
The presentation of an exogenous antigen in a major histocompatibility complex
class-I- restricted fashion to CD8(+) T cells is called cross-presentation. Heat
shock proteins (HSPs) such as Hsp70, gp96, and Hsp90 have been shown to elicit
efficient CTL responses by cross-presentation through an as-yet entirely unknown
mechanism. Hsp90 is the most abundant cytosolic HSP and is known to act as a
molecular chaperone. We have shown that a tumor antigen peptide complexed with
Hsp90 could be cross-presented by dendritic cells (DCs) through an endosomal
pathway in a murine system. However, it has not been determined whether human DCs
also cross-present an Hsp90-peptide complex and induce peptide-specific CTLs. In
this study, we found that an Hsp90-cancer antigen peptide complex was efficiently
cross-presented by human monocyte-derived DCs and induced peptide-specific CTLs.
Furthermore, we observed that the internalized Hsp90-peptide complex was strictly
sorted to the Rab5(+), EEA1(+) static early endosome and the Hsp90-chaperoned
peptide was processed and bound to MHC class I molecules through an
endosome-recycling pathway. Our data indicate that targeting of the antigen to a
"static" early endosome by Hsp90 is essential for efficient cross-presentation.
|*Cross-Priming
[MESH]
|CD8-Positive T-Lymphocytes/immunology
[MESH]
|Cells, Cultured
[MESH]
|Dendritic Cells/*immunology
[MESH]
|Endosomes/*metabolism
[MESH]
|HSP90 Heat-Shock Proteins/*physiology
[MESH]
|Humans
[MESH]
|Inhibitor of Apoptosis Proteins/immunology
[MESH]