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2015 ; 112
(46
): E6293-300
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Telomeric repeat-containing RNA (TERRA) constitutes a nucleoprotein component of
extracellular inflammatory exosomes
#MMPMID26578789
Wang Z
; Deng Z
; Dahmane N
; Tsai K
; Wang P
; Williams DR
; Kossenkov AV
; Showe LC
; Zhang R
; Huang Q
; Conejo-Garcia JR
; Lieberman PM
Proc Natl Acad Sci U S A
2015[Nov]; 112
(46
): E6293-300
PMID26578789
show ga
Telomeric repeat-containing RNA (TERRA) has been identified as a
telomere-associated regulator of chromosome end protection. Here, we report that
TERRA can also be found in extracellular fractions that stimulate innate immune
signaling. We identified extracellular forms of TERRA in mouse tumor and
embryonic brain tissue, as well as in human tissue culture cell lines using RNA
in situ hybridization. RNA-seq analyses revealed TERRA to be among the most
highly represented transcripts in extracellular fractions derived from both
normal and cancer patient blood plasma. Cell-free TERRA (cfTERRA) could be
isolated from the exosome fractions derived from human lymphoblastoid cell line
(LCL) culture media. cfTERRA is a shorter form (?200 nt) of cellular TERRA and
copurifies with CD63- and CD83-positive exosome vesicles that could be visualized
by cyro-electron microscopy. These fractions were also enriched for histone
proteins that physically associate with TERRA in extracellular ChIP assays.
Incubation of cfTERRA-containing exosomes with peripheral blood mononuclear cells
stimulated transcription of several inflammatory cytokine genes, including TNF?,
IL6, and C-X-C chemokine 10 (CXCL10) Exosomes engineered with elevated TERRA or
liposomes with synthetic TERRA further stimulated inflammatory cytokines,
suggesting that exosome-associated TERRA augments innate immune signaling. These
findings imply a previously unidentified extrinsic function for TERRA and a
mechanism of communication between telomeres and innate immune signals in tissue
and tumor microenvironments.