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2018 ; 9
(ä): 534
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Extracellular Vesicle Subtypes Released From Activated or Apoptotic T-Lymphocytes
Carry a Specific and Stimulus-Dependent Protein Cargo
#MMPMID29599781
Tucher C
; Bode K
; Schiller P
; Claßen L
; Birr C
; Souto-Carneiro MM
; Blank N
; Lorenz HM
; Schiller M
Front Immunol
2018[]; 9
(ä): 534
PMID29599781
show ga
Extracellular vesicles (EVs) are released from nearly all mammalian cells and
different EV populations have been described. Microvesicles represent large EVs
(LEVs) released from the cellular surface, while exosomes are small EVs (SEVs)
released from an intracellular compartment. As it is likely that different
stimuli promote the release of distinct EV populations, we analyzed EVs from
human lymphocytes considering the respective release stimuli (activation Vs.
apoptosis induction). We could clearly separate two EV populations, namely SEVs
(average diameter <200?nm) and LEVs (diameter range between 200 and 1000?nm).
Morphology and size were analyzed by electron microscopy and nanoparticle
tracking analysis. Apoptosis induction caused a massive release of LEVs, while
activated T-cells released SEVs and LEVs in considerably lower amounts. The
release of SEVs from apoptotic T-cells was comparable with LEV release from
activated ones. LEVs contained signaling proteins and proteins of the
actin-myosin cytoskeleton. SEVs carried cytoplasmic/endosomal proteins like the
70-kDa heat shock protein 70 (HSP70) or tumor susceptibility 101 (TSG101),
microtubule-associated proteins, and ubiquitinated proteins. The protein
expression profile of SEVs and LEVs changed substantially after the induction of
apoptosis. After apoptosis induction, HSP70 and TSG101 (often used as exosome
markers) were highly expressed within LEVs. Interestingly, in contrast to HSP70
and TSG101, gelsolin and eps15 homology domain-containing protein 3 (EHD3) turned
out to be specific for SEVs irrespective of the stimulus causing the EV release.
Finally, we detected several subunits of the proteasome (PSMB9, PSMB10) as well
as the danger signal HMGB1 exclusively within apoptotic cell-released LEVs. Thus,
we were able to identify new marker proteins that can be useful to discriminate
between distinct LEV subpopulations. The mass spectrometry proteomics data are
available via ProteomeXchange with identifier PXD009074.