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2017 ; 7
(1
): 2046
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Cancer cachexia associates with a systemic autophagy-inducing activity mimicked
by cancer cell-derived IL-6 trans-signaling
#MMPMID28515477
Pettersen K
; Andersen S
; Degen S
; Tadini V
; Grosjean J
; Hatakeyama S
; Tesfahun AN
; Moestue S
; Kim J
; Nonstad U
; Romundstad PR
; Skorpen F
; Sørhaug S
; Amundsen T
; Grønberg BH
; Strasser F
; Stephens N
; Hoem D
; Molven A
; Kaasa S
; Fearon K
; Jacobi C
; Bjørkøy G
Sci Rep
2017[May]; 7
(1
): 2046
PMID28515477
show ga
The majority of cancer patients with advanced disease experience weight loss,
including loss of lean body mass. Severe weight loss is characteristic for cancer
cachexia, a condition that significantly impairs functional status and survival.
The underlying causes of cachexia are incompletely understood, and currently no
therapeutic approach can completely reverse the condition. Autophagy coordinates
lysosomal destruction of cytosolic constituents and is systemically induced by
starvation. We hypothesized that starvation-mimicking signaling compounds
secreted from tumor cells may cause a systemic acceleration of autophagy during
cachexia. We found that IL-6 secreted by tumor cells accelerates autophagy in
myotubes when complexed with soluble IL-6 receptor (trans-signaling). In lung
cancer patients, were cachexia is prevalent, there was a significant correlation
between elevated IL-6 expression in the tumor and poor prognosis of the patients.
We found evidence for an autophagy-inducing bioactivity in serum from cancer
patients and that this is clearly associated with weight loss. Importantly, the
autophagy-inducing bioactivity was reduced by interference with IL-6
trans-signaling. Together, our findings suggest that IL-6 trans-signaling may be
targeted in cancer cachexia.