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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Eur+J+Immunol
2016 ; 46
(6
): 1415-26
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Cardiomyocytes display low mitochondrial priming and are highly resistant toward
cytotoxic T-cell killing
#MMPMID26970349
Zheng X
; Halle S
; Yu K
; Mishra P
; Scherr M
; Pietzsch S
; Willenzon S
; Janssen A
; Boelter J
; Hilfiker-Kleiner D
; Eder M
; Förster R
Eur J Immunol
2016[Jun]; 46
(6
): 1415-26
PMID26970349
show ga
Following heart transplantation, alloimmune responses can cause graft rejection
by damaging donor vascular and parenchymal cells. However, it remains unclear
whether cardiomyocytes are also directly killed by immune cells. Here, we used
two-photon microscopy to investigate how graft-specific effector CD8(+) T cells
interact with cardiomyocytes in a mouse heart transplantation model.
Surprisingly, we observed that CD8(+) T cells are completely impaired in killing
cardiomyocytes. Even after virus-mediated preactivation, antigen-specific CD8(+)
T cells largely fail to lyse these cells although both cell types engage in
dynamic interactions. Furthermore, we established a two-photon microscopy-based
assay using intact myocardium to determine the susceptibility of cardiomyocytes
to undergo apoptosis. This feature, also known as mitochondrial priming reveals
an unexpected weak predisposition of cardiomyocytes to undergo apoptosis in situ.
These observations together with the early exhaustion phenotype of
graft-infiltrating specific T cells provide an explanation why cardiomyocytes are
largely protected from direct CD8(+) T-cell-mediated killing.