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Imroatus Sholihah
Cancer Chemoprevention Research Center, Faculty of Pharmacy, Universitas Gadjah Mada
Biochemistry, Genetics & Molecular Biology Medicine & Pharmacology

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Antiproliferative Effect of Secang Heartwood Ethanolic Extract (Caesalpinia sappan L.) on HER2-Positive Breast Cancer Cells Rahmawaty Rachmady; Laely Muntafiah; Fahmi Rosyadi; Imroatus Sholihah; Sri Handayani; Riris Istighfari Jenie
Indonesian Journal of Cancer Chemoprevention Vol 7, No 1 (2016)
Publisher : Indonesian Society for Cancer Chemoprevention

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14499/indonesianjcanchemoprev7iss1pp1-5

Abstract

Human Epidermal Growth Factor Receptor 2 (HER2) plays critical role in the initiation of breast cancer cell proliferation. Inhibition of HER2 overexpression is a promising strategy in the treatment of breast cancer. One of the potential natural substances that possess cytotoxic in cancer cells is Secang (Caesalpinia sappan L.). Ethanolic extract of secang heartwood containing brazilein and brazilin shows cytotoxic effect on various cancer cells. Thus this research aims to determine the proliferative inhibition activity of secang heartwood ethanolic extract (SEE) through HER2 expression on MCF-7/HER2 positive. Cytotoxic activity of SEE on MCF-7/HER2 positive cells was observed by MTT assay, meanwhile the inhibition activity of  HER2 on MCF-7/HER2 cells was determined by immunofluoresence assay. Furthermore, to confirm the possible mechanism of brazilein and brazilin for its cytotoxic activity was studied through molecular docking using PLANTS software. Based on this study, SEE exhibited cytotoxic effect on MCF-7/HER2 positive cells with IC50 value of 25 µg/ml, and EES also inhibited HER2 expression, indicated that the antiproliferative effect of SEE was possible through the inhibition of HER2. Docking score of brazilein, brazilin, and native ligand on HER2 were -77; -73; -120 respectively, showed the affinity of brazilein in HER2 was lower than affinity of native ligand, but they had specific amino acid to interaction. Hence, SEE can be developed as one of promising chemopreventive agent from natural products.Keywords: Caesalpinia sappan L., cytotoxic, immunofluorescence, molecular docking, MCF7/HER2 cells
Jure Leaf Extract (Nerium indium Mill.) Increased 5-Fluorouracil Sensitivity through Inhibition of NF-κB Activation and Transporter Protein in WiDr Colon Cancer Cell Imroatus Sholihah; Meirizky Zulharini S.; Amalia Miranda; Refki Riswansyah; Riris Istighfari Jenie
Indonesian Journal of Cancer Chemoprevention Vol 7, No 3 (2016)
Publisher : Indonesian Society for Cancer Chemoprevention

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14499/indonesianjcanchemoprev7iss3pp87-92

Abstract

5-Fluorouracil (5-FU) is the first line chemotherapeutic agents for colon cancer therapy. Long term used of 5-FU caused cancer cell resistency. Thus, co-chemoteraputics agent should be developed to increase cells sensitivty towards 5-FU. Jure leaf  (Nerium indicum Mill) extract (JLE) contains oleandrin which has cytotoxic effect on colon cancer cell. The ain of this study was to investigated the mechanism of JLE to sensitized colon cancer cell toward 5-FU through NF-κB inhibition and MRP protein repression. JLE was extracted by soxhletation method. Based on molecular docking to MRP protein, docking score of oleandrin (-50,496)  was higher than native ligand ATP (-125,817). Oleandrin could interfere interaction with MRP. JLE increased 5-FU sensitivity a dose of 2 µg/mL JLE dan 12,5 µM 5-FU with the combination index (CI) of  0,594. Combination of JLE and 5-FU also inhibit p65 protein expression on WiDr cell.Keywords: cytotoxic, Nerium indicum Mill., oleandrin, immunofluorescence, molecular docking
Co-Authors Amalia Miranda Fahmi Rosyadi Jenie, Riris Istighfari Laely Muntafiah Meirizky Zulharini S. Rahmawaty Rachmady Refki Riswansyah Sri Handayani