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Baicalein induces ubiquitylation of Snail and Slug via CYR61 signaling pathway in human breast cancer cells

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Abstract
Epithelial-mesenchymal transition (EMT), a critical step in the acquisition of metastatic state, is an attractive target for therapeutic interventions directed against tumor metastasis. Baicalein is a widely used herbal medicine that has been used historically in anti-inflammatory and anti-cancer therapy. The purpose of this study was to determine a molecular mechanism of Baicalein anti-metastatic activity which remains poorly understood and warrants further investigations. Cysteine-rich protein 61 (CCN1/CYR61) has been implicated as an important mediator in proliferation and metastasis of breast cancer, which indicated that blockage of CYR61 might be a potent target for breast cancer treatment. Here we showed the novel mechanism in which Baicalein inhibits EMT by targeting CYR61 and then Akt/GSK3β signaling pathway. Subsequently, Baicalein induced the degradation and ubiquytilation of Snail and Slug through GSK3β activation. Interestingly, Baicalein inhibited the direct interaction of LOXL-2 with Snail and Slug that attenuate GSK3β-dependent Snail and Slug degradation. Our findings provide new insights into the anti-metastasis of Baicalein and may contribute to beneficial use of Baicalein in breast cancer therapies.
Epithelial-mesenchymal transition (EMT)는 전이상태를 획득하기 위해 중요한 단계이며, 암 전이를 치료하기 위한 표적이 된다. Baicalein은 항염증과 항암치료에 있어서 예로부터 널리 사용된 천연 의약품이다. 본 연구는 아직 연구가 미흡한 Baicalein의 항전이 활성의 분자적 메커니즘을 구명하고자 하였다. Cysteine-rich protein 61 (CCN1/CYR61)은 유방암의 증식과 전이에 관련된 중요한 매개 단백질이므로, 유방암 치료에 있어서 CYR61을 억제하는 것은 중요한 표적이 될 수 있다. 본 연구에서는 Baicalein이 CYR61과 Akt/GSK3β pathway를 표적함으로써 EMT를 억제하는 메커니즘을 밝혔다. Baicalein은 GSK3β의 활성을 통해 Snail과 Slug 분해와 유비퀴틴화를 유도하였다. 또한, Baicalein은 GSK3β에 의한 Snail과 Slug의 분해를 억제하는 LOXL-2와 Snail, Slug의 상호작용을 직접적으로 저해하는 것으로 나타났다. 따라서 이러한 결과들은 Baicalein의 항전이 활성에 대한 새로운 이해를 제공함으로써 유방암 치료에 있어서 Baicalein의 유용한 사용에 기여할 수 있을 것으로 생각된다.
Author(s)
Nguyen Thi Thao Linh
Issued Date
2014
Awarded Date
2015. 2
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000007006
Department
대학원 응용생명공학과
Table Of Contents
1. Introduction 1
2. Materials and Methods 6
2.1 Cell culture and reagents 6
2.2 Cytotoxicity 6
2.3 Wound healing assay 7
2.4 Invasion assay 7
2.5 Reverse transcription-polymerase chain reaction (RT-PCR) 8
2.6 Western Blotting 9
2.7 Immunoprecipitation 9
2.8 Transient transfection 10
2.9 Statistical analysis 10
3. Results 11
3.1 MDA-MB231 is more metastatic than MCF-7 11
3.2 Effect of Phytochemicals on MDA-MB231 human breast cancer cells 13
3.3 Baicalein suppresses migration of MDA-MB231 by post-transcriptional regulation of Snail and Slug 19
3.4 Baicalein induced ubiquitylation of Snail and Slug by inhibiting the association of Snail and Slug with LOXL-2 23
3.5 Baicalein mediates Snail and Slug degradation via Akt/GSK3β signaling pathway 27
3.6 Baicalein induced ubiquitylation of Snail and Slug by stimulate the interaction of GSK3β with Snail and Slug 29
3.7 CYR61 regulates Baicalein-mediated Akt/GSK3β signaling in human breast cancer MDA-MB231 cells.34
4. Discussion 37
REFERENCES 40
ACKNOWLEDGEMENT 44
Degree
Master
Publisher
제주대학교 대학원
Citation
Nguyen Thi Thao Linh. (2014). Baicalein induces ubiquitylation of Snail and Slug via CYR61 signaling pathway in human breast cancer cells
Appears in Collections:
General Graduate School > Biomaterials Science and Technology
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