Complement C3 overexpression activates JAK2/STAT3 pathway and correlates with gastric cancer progression.

Abstract:

BACKGROUND:Localized C3 deposition is a well-known factor of inflammation. However, its role in oncoprogression of gastric cancer (GC) remains obscured. This study aims to explore the prognostic value of C3 deposition and to elucidate the mechanism of C3-related oncoprogression for GC. METHODS:From August to December 2013, 106 GC patients were prospectively included. The regional expression of C3 and other effectors in gastric tissues were detected by WB, IHC, qRT-PCR and other tests. The correlation of localized C3 deposition and oncologic outcomes was determined by 5-year survival significance. Human GC and normal epithelial cell lines were employed to detect a relationship between C3 and STAT3 signaling pathway in vitro experiments. RESULTS:C3 and C3a expression were markedly enhanced in GC tissues at both mRNA and protein levels compared with those in paired nontumorous tissues. According to IHC C3 score, 65 (61.3%) and 41 (38.7%) patients had high and low C3 deposition, respectively. C3 deposition was negatively correlated with plasma levels of C3 and C3a (both P < 0.001) and positively correlated with pathological T and TNM stages (both P < 0.001). High C3 deposition was identified as an independent prognostic factor of poor 5-year overall survival (P = 0.045). In vitro C3 administration remarkably enhanced p-JAK2/p-STAT3 expression in GC cell lines but caused a reduction of such activation when pre-incubated with a C3 blocker. Importantly, C3 failed to activate such signaling in cells pre-treated with a JAK2 inhibitor. CONCLUSIONS:Localized C3 deposition in the tumor microenvironment is a relevant immune signature for predicting prognosis of GC. It may aberrantly activate JAK2/STAT3 pathway allowing oncoprogression. TRIAL REGISTRATION:ClinicalTrials.gov, NCT02425930, Registered 1st August 2013.

journal_name

J Exp Clin Cancer Res

authors

Yuan K,Ye J,Liu Z,Ren Y,He W,Xu J,He Y,Yuan Y

doi

10.1186/s13046-019-1514-3

subject

Has Abstract

pub_date

2020-01-13 00:00:00

pages

9

issue

1

eissn

0392-9078

issn

1756-9966

pii

10.1186/s13046-019-1514-3

journal_volume

39

pub_type

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