CC BY
49
DOI 10.18551/rjoas.2019-06.07
NANOPARTICLES FROM ONION (ALLIUM CEPA.L) EXTRACT SUPPRESS BCL-2 EXPRESSION IN MCF-7 CELLS IN VITRO
Jayanti Shara*, Suseno Dewi Nurmalita, Suseno Dewi Alima Nostalia
Marine Fisheries Polytechnic, Sidoarjo, East Java, Indonesia *E-mail: [email protected]
ABSTRACT
This research aimed to make nanoparticles from Allium cepa. L extract that can inhibit Bcl-2 protein expression in MCF-7 cells in vitro. The particles were broken down to nano with the addition of NaTPP dissolved in distilled water and chitosan dissolved in 1% acetic acid. The particle size based on the SEM and PSA tests had an average size of 336 nm. Nanoparticles from Allium cepa. L extract based on the KLT test contained flavonoids, saponins, and tannins. MCF-7 cells were treated with doses of 40 ^g/ml, 80 ug/ml, 160 ug/ml, and 320 ug/ml. The results showed that nanoparticles from Allium cepa. L extract had cytotoxicity in MCF-7 cells with the IC50 value of 235 ^g/ml and proved to inhibit Bcl-2 protein expression.
KEY WORDS
Allium cepa L, nanoparticles extract, Bcl-2, MCF-7.
Breast cancer refers to cancers originating from the mammary gland, glandular tissue, and breast supportive tissue. Besides, breast cancer has been reported to attack some animals, particularly productive adult female dogs [1, 2]. The high incidence of breast cancer results in various treatment. In this research, a breakdown method for drug particles in cancer therapy was developed to enhance the ability of drug release.
Nanoparticles have higher drug release ability than drugs with general particle size. Nanoparticles from Allium cepa. L have active compounds such as flavonoids, saponins, tannins and other compounds such as vitamins (B1, B2, and C), sodium, potassium, phosphorus, and others [3].
Flavonoids in Allium cepa. L act as antioxidants that can prevent oxidation, stabilize free radicals formed by carcinogenic compounds, and inhibit the production of heat shock proteins causing drug resistance in cancer therapy. Thus, drugs for cancer therapy derived from plant extracts have been used as an alternative therapy to prevent the negative reaction and inhibit anti-apoptotic protein with safe doses [4]. Flavonoids can induce apoptotic cells [5].
In addition to flavonoids, saponins have immunomodulatory activities and ability to inhibit the proliferation of cancer cells. Tannins also have the potential as antioxidants [6,7] Saponins and tannins are coined as effective phytochemical agents. Saponins are composed of one or more hydrophilic glycoside moieties along with a lipophilic and derived aglycone and finally one or more sugar chains. Saponins interfere with the replication of cellular DNA and prevent the proliferation of cancer cells. Tannins are of polyphenolic nature. The features distinguishing tannins from plant-based polyphenols of other types are basically the properties of the binding of the former to proteins, basic compounds, pigments, large-molecular compounds, and metallic ions and also the display of anti-oxidant activities [8]. Saponins have immunomodulatory potential via cytokine interplay [9].
Bcl-2 is anti-apoptotic proteins. Bcl-2 overexpression inhibits TRAIL-induced apoptosis in neuroblastoma, glioblastoma, and breast carcinoma cells [10].
METHODS OF RESEARCH
Allium cepa. L were collected and cut into small pieces. Allium cepa. L slices were dried in the room for 7 days, dried again in the oven at 500C, and then powdered using a mechanical blender. 148 grams of this powder was extracted using the maceration method
with 70% ethanol for 24 h. The obtained extracts were put to vacuum evaporator for evaporation of the excess solvent.
Allium cepa. L's nanoparticles were prepared by ionic gelation method. 1 gram of Allium cepa. L's extract was taken and put into the Duran tube. It was added with 35 ml of ethanol and 15 ml of distilled water. Then, a 1% chitosan solution diluted in 100 ml of 1% acetic acid was added. A 0,001% NaTPP solution diluted in 350 ml of distilled water was added slowly while being rotated with the magnetic stirrer for 2 h. Nanoparticles preparation was conducted in the Clinical Pathology Laboratory, Faculty of Veterinary, Airlangga University.
Nanoparticles were put in vacuum evaporator for evaporation of the excess solvent for 24 h. The obtained extracts were put to vacuum evaporator for evaporation of the excess solvent and finally, these nanoparticles were freeze-dried to maintain the stability.
Flavonoids, saponins, and tannins are phytochemical compounds. The qualitative phytochemical screening of 500 mg of nanoparticles from Allium cepa. L extract diluted in 1 ml of 70% ethanol was performed using TLC. The mobile phase used n-hexane ethyl acetate at 8:2 ratio of 2 ml.
Spray reagents used were ammonia for flavonoids detection, anisaldehyde for saponins detection, and FeCl3 for tannins detection. The results were observed visually under UV light at 366 nm.
Particle size analysis of Allium cepa. L's nanoparticles was conducted by Particle Size Analyzer (PSA) using Malvern Zetasizer Nano series Nano ZS (Malvern Instruments Ltd.)
Scanning electron microscopy of Allium cepa. L nanoparticles was conducted using Carl Zeiss (Evo MA 10) English.
Breast cancer cell line used in this research was the Michigan Cancer Foundation-7 (MCF-7) cell line. Cells were cultured in Dulbecco's Modified Eagle's Medium (DMEM) medium supplemented with 10% FBS, 2% penicillin and streptomycin, and 0,5% fungizone at 370C in the incubator containing 5% CO2.
First, the sample used as a therapy for MCF-7 cells was prepared. One mg of Allium cepa. L's nanoparticles was taken and diluted in 1 ml of dimethyl sulfoxide (DMSO), then diluted again in DMEM medium until the concentrations were 40 ^g/ml, 80 ^g/ml, 160 ^g/ml, and 320 ^g/ml. A positive control was made by diluting 1 mg of cisplatin into 1 ml DMSO in DMEM medium until the concentration was 4 ^g/ml. In this research, 100 ^l DMSO was used as a negative control.
Cells were seeded at the concentration of 5000 cells/100 ^l DMSO in a 96-well plate. After 24 h of incubation, the medium was removed and the doses of the treatment were entered into the well with Allium cepa. L's nanoparticles doses (50 ^g/ml, 100 ^g/ml, 150 ^g/ml, and 200 ^g/ml), cisplatin doses, and negative control doses. Each treatment was repeated three times and incubated at 370C for 24 h. After 24 h of incubation, liquid in the 96-well was removed and MTT was added into all of the wells, then incubated at 370C for 2h. Finally, 1% SDS was added to lyse the life cells so formazan could be read. Optical Density (OD) can be read by ELISA reader at 366 nm.
The growth inhibition was determined using Table 1.
Immunohistochemical analysis was performed to evaluate Bcl-2 gene expression in MCF-7 cells which were treated with nanoparticles of Allium cepa. L extract (Marleen et al., 2011).
Immunohistochemical painting for Bcl-2 protein expression in MCF-7 cells was carried out in 4 treatment groups (cell control for Bcl-2, IC50, 2IC50, and 4IC50). This method used 6-well microplates with coverslips. MCF-7 cells and DMEM complete media of 500 ^l with 5x104 cells/well were incubated in 5% CO2 at 370C for 24 hours. Then, the DMEM medium was removed, nanoparticles extract and Allium cepa. L extracts were added according to
dosage, and incubated in an incubator in 5% CO2 at 370C for 24 hours. After incubation, the media was removed again, fixed with 500 ^L methanol left at 370C for 10 minutes, washed with tap water three times, and finally washed with PBS and left for 5 minutes.
The remaining PBS was removed, added with 30% blocking solution (H2O2) with 10 ml of methanol (1: 9), incubated for 10 minutes, washed with tap water, and the preparations were rinsed with PBS. Then, the preparations were added with 20 ^l of serum blocking and incubated for 10 minutes in a wet tray. 50 ^l of Bcl-2 antibodies were added and incubated for 1 hour in a wet tray. The preparations were washed with 2x PBS and added with 30 ^l of biotin (secondary Ab), and incubated in a wet tray for 20 minutes. Next, 30 ^l of streptavidin was added and incubated in a wet tray for 10 minutes. The preparations were washed again with 2x PBS and added with 30 ^l of substrate (1000 ^l of buffer substrate and 10 ^l of diaminobenzidine), washed with tap water to clean the substrate and H&E color, and left for 3 minutes. The preparations were washed with running water, drained, and pressed with mounting media. The preparations were covered with a coverslip and Bcl-2 protein expressions in the cell cytoplasm were observed using the inverted microscope at 1000x magnification.
RESULTS OF STUDY
The analysis results of TLC proved that Allium cepa. L nanoparticles had active ingredients which can act as antioxidants and inhibit heat shock protein (HSP) in many malignant cancer cells, including breast cancer cells [11].
Table 1 - Phytochemical result of Allium cepa. L nanoparticles
No Media Mode After Spray Observation
1 Flavonoids + With UV 366 nm The color was light blue after being sprayed with ammonia
2 Tannins + : ^ Visual The color was black after being sprayed with FeCl3
3 Saponins + c* Nkvff Visual The color was violet after being sprayed with anisaldehyde
The results of the particle size analysis showed that the size distribution of Allium cepa. L nanoparticles were 84.7% with Z-Average (d.nm) of 336,8 nm.
Figure 1 - Size distribution results of Allium cepa. L nanoparticles
Figure 2 - Scanning electron microscopy (8.000x Figure 3 - Scanning electron microscopy (10.000x
magnification) magnification)
The effective concentration of nanoparticles from Allium cepa. L extract required for 50% inhibition of the cell viability was expressed as IC50. In this research, nanoparticles from Allium cepa. L extract could inhibit MCF cell growth with the IC50 value of 235 pg/ml.
Table 2 - Cytotoxic activity of Allium cepa. L nanoparticles
No Type of treatment Therapy concentration (pg/ml) Cell death % Linear Regression IC50
1 40 pg/ml 44.52%
2 Allium cepa. L 80 pg/ml 47.63% y = 45.30 + 235
3 nanoparticles 160 pg/ml 50.45% 0.020x pg/ml
4 320 pg/ml 51.08%
5 Positive control (cisplatin) 4 pg/ml 15.61%
6 Negative control (DMSO) 100 pl 3.01%
Figure 4 - Bcl-2 expression from MCF-7 cells from the immunohistochemical analysis given therapy with a series
of concentrations of Allium cepa. L nanoparticles with 24-hour incubation time. A) Control of MCF-7 cells, B) therapeutic dose (IC50) of 235 pg/mL, C), therapeutic dose (2IC50) of 470 pg/mL, D), therapeutic dose (4IC50) of
940 pg/mL
The results of the scanning electron microscopy showed the surface visualization and the size of Allium cepa. L nanoparticles. SEM in this research used four magnifications of 8.000x and 10.000x.
Observation on the Bcl-2 expression level was characterized by the brown color of the cell cytoplasm. When there was no Bcl-2 activity, the cytoplasm was purplish-blue in color according to the coloring used. This research used H&E staining [12].
DISCUSSION OF RESULTS
The research results showed that cells treated by Allium cepa. L nanoparticles after 24 h incubation time could suppress Bcl-2 expression and inhibit the proliferation of MCF-7 cells at concentrations of 40 ^g/ml, 80 ^g/ml, 160 ^g/ml and 320 ^g/ml. The higher concentration caused a smaller number of living cells. Based on data about cell death percentages and after being calculated by linear regression statistics, the concentration of 235 ^g/ml could inhibit 50% MCF-7 cell proliferation.
Cytotoxicity of Allium cepa. L was influenced by the particle size because nanoparticles could release the drug 74 times faster [13] and the active ingredients contained in Allium cepa. L. Table 1, especially flavonoids. When flavonoids contained in Allium cepa. L was broken down, many quercetin compounds were found [3].
Quercetin is the aglycone form of a number of glycosides that can react as an anticancer to cell regulation and inhibit DNA topoisomerase enzymes cell cancer [14]. Quercetin is also capable of suppressing mutant p53 expression in breast cancer cells [15].
The results of the particle size analysis in this research showed that the size of the obtained nanoparticles had a Z-average of 336,8 nm. These results are in line with a theory stating that the good size range of a nanoparticle is 336 nm [16].
ACKNOWLEDGMENTS
This work was conducted in Department of Veterinary Clinical Pathology, Faculty of Veterinary Medicine, Airlangga University; Department of Phytochemistry, Faculty of Pharmacy, Airlangga University and Department of Parasitology, Faculty of Medicine, Gadjah Mada University.
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