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Volume 144, Issue 5, Pages e4 (May 2013)

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Presentation on theme: "Volume 144, Issue 5, Pages e4 (May 2013)"— Presentation transcript:

1 Volume 144, Issue 5, Pages 956-966.e4 (May 2013)
Hypomethylation of Noncoding DNA Regions and Overexpression of the Long Noncoding RNA, AFAP1-AS1, in Barrett's Esophagus and Esophageal Adenocarcinoma  Wenjing Wu, Tushar D. Bhagat, Xue Yang, Jee Hoon Song, Yulan Cheng, Rachana Agarwal, John M. Abraham, Sariat Ibrahim, Matthias Bartenstein, Zulfiqar Hussain, Masako Suzuki, Yiting Yu, Wei Chen, Charis Eng, John Greally, Amit Verma, Stephen J. Meltzer  Gastroenterology  Volume 144, Issue 5, Pages e4 (May 2013) DOI: /j.gastro Copyright © 2013 AGA Institute Terms and Conditions

2 Figure 1 Genome-wide hypomethylation in BE. (A) Three sets of endoscopic biopsy specimens representing NE and BE were examined using HELP tagging. Hypomethylation was seen in BE (t test, **P < .005; *P < .05). Hierarchical clustering was based on CpG methylation for all (B) probes, (C) coding regions, and (D) noncoding regions. Correlation plots were created based on methylation of (E) coding and (F) noncoding regions. Gastroenterology  , e4DOI: ( /j.gastro ) Copyright © 2013 AGA Institute Terms and Conditions

3 Figure 2 Hypomethylation affects noncoding regions. (A and B) Volcano plots display differences in mean methylation between NE and BE samples (x-axis) and logs of P values between means (y-axis). Differentially methylated loci (red) reveal hypomethylation in both large and small noncoding regions. (C) Heat map displaying differential CpG methylation at all noncoding regions shows predominant hypomethylation. (D) Bar graph illustrating distribution of CpG densities according to differential methylation. Gastroenterology  , e4DOI: ( /j.gastro ) Copyright © 2013 AGA Institute Terms and Conditions

4 Figure 3 Aberrant methylation and expression of AFAP1-AS1 in human EAC. (A) HELP-tagging results for matched BE and NE samples. Upward vertical bars (proportional to percent hypomethylation) are taller and more numerous in BE1 than in NE1, showing relative hypomethylation at the AFAP1-AS1 locus in BE. (B) Expression of AFAP1-AS1 (upper panel) and AFAP1 (lower panel) in tissues studied for methylation. AFAP1-AS1 expression was significantly higher in BE than NE in 2 of the 3 tissue pairs. AFAP1 expression was lower than AFAP1-AS1 expression but not significantly different between BE and NE. (C) Bisulfite MassArray analysis of methylation of the AFAP1-AS1 locus reveals hypomethylation in sample B1 (BE) relative to its matched N1 (NE) sample. Normal stomach (NS) is methylated similarly to NE. Sample B3 is not hypomethylated compared with N3, in agreement with expression levels for this paired set. (D) AFAP1-AS1 expression was elevated in all EAC cell lines tested (OE33, SKGT4, FLO-1). HEEpic, nonimmortalized normal primary esophageal epithelial cells. * P<.05 compared with HEEpic. (E) In 20 EAC cases, AFAP1-AS1 expression was elevated in 75% of EACs (15/20) versus NE tissues. AFAP1-AS1 expression was elevated in 91% of BEs (11/12) relative to NE tissues. (F) Expression levels of AFAP1 in NE and EAC tissues from 20 patients. There was no significant difference between NE and EAC. Gastroenterology  , e4DOI: ( /j.gastro ) Copyright © 2013 AGA Institute Terms and Conditions

5 Figure 4 Knockdown efficiency of AFAP1-AS1–specific siRNAs in EAC cells. (A and B) Two siRNA molecules were tested. Both siRNAs at 20 nmol/L and 60 nmol/L yielded ≥60% reduced expression of AFAP1-AS1 in OE33 and SKGT4 EAC cells (vs scrambled siRNAs). * P<.05. Gastroenterology  , e4DOI: ( /j.gastro ) Copyright © 2013 AGA Institute Terms and Conditions

6 Figure 5 Inhibition of AFAP1-AS1 significantly reduces proliferation and colony formation in EAC cells. (A) WST-1 cell proliferation assays in OE33 and SKGT4 cells. Both the 20 nmol/L and 60 nmol/L concentrations induced significantly lower growth rates *(P < .01 and *P < .01, respectively). (B) Colony formation assays. (Left panel) AFAP1-AS1–specific siRNA-treated cells (2 wells at right) versus scrambled control siRNA-treated cells (leftmost well) (original magnification 10×). (Right panel) Mean ± standard deviation of 3 independent experiments. **P < .05. (C) Relative to treatment with a scrambled siRNA, transfection with a specific AFAP1-AS1 siRNA induced significant apoptosis (lower right quadrant, 23.76% ± 1.50% vs 7.63% ± 2.62%; *P < .05) in OE33 cells. (D) Western blotting revealed cleaved caspase-3 only in AFAP1-AS1 siRNA-treated cells. (E) Cell cycle results in OE33 EAC cells. Relative to treatment with a scrambled siRNA, transfection with a specific AFAP1-AS1 siRNA induced significant G2/M-phase cell cycle arrest. *P<.05. NSC, nonspecific control siRNA. Gastroenterology  , e4DOI: ( /j.gastro ) Copyright © 2013 AGA Institute Terms and Conditions

7 Figure 6 AFAP1-AS1 suppression inhibits cell motility. (A) Wound healing assays. AFAP1-AS1 suppression by siRNA decreased SKGT4 cell motility (original magnification 10×). (B) In vitro migration and invasion assays. *P < .05. NSC, nonspecific control siRNA. Gastroenterology  , e4DOI: ( /j.gastro ) Copyright © 2013 AGA Institute Terms and Conditions

8 Supplementary Figure 2 Expression levels of AFAP1-AS1 and AFAP1 are compared in matching normal esophagus, BE, and EAC from the same 3 patients. (A) Two of these patients exhibit higher RNA levels of both AFAP1-AS1 and AFAP1 in BE and EAC versus NE, while the third patient shows no significant change in either of these RNAs. (B) AFAP1 protein levels in tissues from patient 1 (N, normal esophagus; B, Barrett's; T, EAC). Gastroenterology  , e4DOI: ( /j.gastro ) Copyright © 2013 AGA Institute Terms and Conditions

9 Supplementary Figure 3 HELP tagging results for matched BE and NE samples. Upward vertical bars, indicating percent hypomethylation, are taller and more numerous in BE at the AFAP1-AS1 locus (red box), thus showing relative hypomethylation at this noncoding locus. The methylation profile at the start site of the AFAP1 gene is very similar between NE and BE (blue box). Gastroenterology  , e4DOI: ( /j.gastro ) Copyright © 2013 AGA Institute Terms and Conditions

10 Supplementary Figure 4 AFAP1 expression does not change significantly after AFAP1-AS1–specific siRNA transfection. (A and B) AFAP1 expression measured by quantitative reverse-transcription polymerase chain reaction 48 hours (left panel) and Western blot 72 hours (right panel) after AFAP1-AS1–specific siRNA treatment in SKGT4 and OE33 EAC cell lines, respectively. Although siRNA-1 affected AFAP1 expression, the magnitude of this effect was not significant. NSC, nonspecific control siRNA. Gastroenterology  , e4DOI: ( /j.gastro ) Copyright © 2013 AGA Institute Terms and Conditions

11 Supplementary Figure 5 Wound healing assays show that suppression of AFAP1-AS1 expression by siRNA results in decreased motility of OE33 cells. Moreover, when OE33 cells were treated with AFAP1-AS1-specific siRNA, cell death increased markedly within 24 hours. Images are representative of 3 independent experiments (magnification 10x). Gastroenterology  , e4DOI: ( /j.gastro ) Copyright © 2013 AGA Institute Terms and Conditions

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