Upregulation of RASSF1A in Colon Cancer by Suppression of Angiogenesis Signaling and Akt Activation

被引:28
作者
Blanchard, Thomas G. [1 ]
Lapidus, Rena [2 ]
Banerjee, Vivekjyoti [1 ]
Bafford, Andrea C. [3 ]
Czinn, Steven J. [1 ]
Ahmed, Hafiz [4 ]
Banerjee, Aditi [1 ]
机构
[1] Univ Maryland, Sch Med, Dept Pediat, Bressler Res Bldg,13-043,655 W Baltimore St, Baltimore, MD 21201 USA
[2] Univ Maryland, Sch Med, Dept Med, Baltimore, MD 21201 USA
[3] Univ Maryland, Sch Med, Dept Surg, Baltimore, MD 21201 USA
[4] GlycoMantra Inc, Baltimore, MD USA
关键词
Andrographolide (AGP); RASSF1A; PTEN; ER stress; Angiogenesis; Colon Cancer; CELL-CYCLE PROGRESSION; TUMOR-SUPPRESSOR; IN-VIVO; ANDROGRAPHOLIDE SENSITIZES; COLORECTAL-CANCER; INDUCED APOPTOSIS; GROWTH-FACTOR; LUNG-CANCER; GENE; EXPRESSION;
D O I
10.1159/000492012
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Background/Aims: Silencing of tumor suppressor genes (TSGs) and promotion of angiogenesis are associated with tumor development and metastasis. However, little is known if angiogenic molecules directly control TSGs and vice versa. Methods: A regulatory link between angiogenesis and down regulation of TSGs was evaluated using an anti-cancer agent, andrographolide (AGP) in cancer cells, mouse xenograft tissues and patient derived organoids through gene/protein expression, gene silencing, and immunohistochemical analyses. Results: AGP treatment demonstrated significant expression of RASSF1A and PTEN TSGs in colon cancer and other cancer cells, mouse tissues and organoids. Depletion of RASSF1A with siRNA limited cyclin D1 and BAX expression. SiRNA depletion of PTEN, upstream regulator of RASSF1A resulted in a 50% reduction in RASSF1A expression. Histopathological analysis of the AGP treated tumor sections showed significant reduction in vessel size, microvascular density and tumor mitotic index suggesting suppression of angiogenesis. This was corroborated by protein analysis demonstrating significant reductions in angiogenesis signaling pathway molecules VEGF,65, FOXM1, and pAkt, but significant elevation of the endogenous angiogenesis inhibitor Tsp-2. Treatment of cells with exogenous VEGF prevented the suppression of angiogenesis signaling by AGR resulting in sustained expression of pAkt, an upstream down-regulator of RASSF1A. RASSF1A expression remained low in VEGF treated cells despite the addition of AGP. Conclusion: Our results demonstrate for the first time that AGP induces RASSF1A expression in colon cancer cells and is dependent on angiogenesis signaling events. Therefore, our research may facilitate novel therapeutic options for advanced colon cancer therapy. (C) 2018 The Author(s) Published by S. Karger AG, Basel
引用
收藏
页码:1259 / 1273
页数:15
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