Resveratrol Protects SH-SY5Y Neuroblastoma Cells from Apoptosis Induced by Dopamine
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EXPERIMENTAL and MOLECULAR MEDICINE, Vol. 39, No. 3, 376-384, June 2007 Resveratrol protects SH-SY5Y neuroblastoma cells from apoptosis induced by dopamine 1 2 Mi Kyung Lee , Soon Ja Kang , increase in the Bcl-2 protein, and activation of cas- 3 4 Mortimer Poncz , Ki-Joon Song pase-3. These results suggest that DA may be a 4,5 and Kwang Sook Park potential oxidant of neuronal cells at biologically relevant concentrations. Resveratrol may protect 1 Department of Genetics, College of Life Science SH-SY5Y cells against this cytotoxicity, reducing 2 Department of Science Education intracellular oxidative stress through canonical College of Education signal pathways of apoptosis and may be of bio - Ewha Womans University logical importance in the prevention of a dopami- Seoul 120-750, Korea nergic neurodegenerative disorder such as Parkin - 3 Division of Hematology, Children’s Hospital of Philadelphia son disease. PA 19104, USA 4 Keywords: Department of Microbiology and antioxidant; apoptosis; dopamine; neuro- Bank for Pathogenic Viruses blastoma; neurodegenerative diseases; resveratrol Division of Brain Korea 21 Program for Biomedical Science College of Medicine, Korea University Introduction Seoul 136-705, Korea 5 Corresponding author: Tel: 82-2-920-6164; Parkinson’s disease (PD) is a common neurode- Fax: 82-2-923-3645; E-mail: [email protected] generative disease, characterized by a selective loss of dopaminergic neurons in the substantia nigra. Accepted 11 April 2007 Many factors are speculated to operate in the me- chanism of cell death of nigrostriatal dopaminergic Abbreviations: DA, dopamine; MMP, mitochondrial membrane neurons in PD, including oxidative stress and cyto- potential; PI, propidium iodide; PS, phosphatidyl serine toxicity of reactive oxygen species (ROS), distur- bances of intracellular calcium homeostasis, exoge- Abstract nous and endogenous toxins, and mitochondrial dys- function. An endogenous neurotransmitter dopamine Dopamine (DA) is an oxidant that may contribute to (DA) is thought to be a major source of oxidative stress to these neural cells (Olanow, 1993; Offen et the degeneration of dopaminergic neurons. The al present study demonstrates that DA-induced ., 1997). DA contains an unstable catechol moiety, and it can oxidize spontaneously to form ROS, free cytotoxicity in human-derived neurotypic cells, radicals, and quinones (Cohen and Heikkila, 1974; SH-SY5Y, is prevented by resveratrol, one of the Graham, 1978; Hastings, 1995). In the human subs- major antioxidative constituents found in the skin of tantia nigra, the DA oxidation products may further grapes. SH-SY5Y cells, a neuroblastoma cell line, polymerize to form another neurotoxin, neurome- µ treated with DA at 300 and 500 M for 24 h underwent lanin (Jellinger et al., 1993). These oxidation products apoptotic death as determined by characteristic can damage cellular components such as lipids, morphological features, including nuclear conden - proteins, and DNA (Halliwell, 1992). sation, and loss of mitochondrial membrane poten - One of the plausible ways to prevent the cell tial (MMP). Flow cytometric analysis using Annexin V death induced by oxidative stress is dietary or showed that DA can induce significant and severe pharmacological intake of antioxidants. Lai and Yu apoptosis. Exposure to resveratrol (5 µM) for 1 h prior (1997) showed that DA-induced apoptosis is protec- to the DA treatment attenuated DA-induced cyto - ted by some antioxidants such as glutathione and toxicity, and rescued the loss of MMP. To investigate N-acetyl-L-cysteine. One family of naturally occurring the apoptotic signaling pathways relevant to the compounds possessing free radical scavenging pro- restoration of DA-induced apoptosis by resveratrol, perties is the polyphenols. It is found in fruit, vegeta- we carried out quantitative analysis of Bcl-2, cas- bles and plant-derived beverages and may have pase-3, and cleaved poly ADP-ribose polymerase important roles as dietary components via cytopro- (PARP) by immunoblot analysis. Resveratrol pre- tective actions in many organs (Youdim and Joseph, trans- treatment led to a decrease in cleavage of PARP, an 2001). Resveratrol (3,5,4'-tihydroxy- stilbene), a Resveratrol inhibits dopamine-induced apoptosis 377 polyphenolic phytoalexin found in the skin of grapes, and incubated in the CO2 incubator for 3 h. Plates has been reported to possess a wide range of bio- were read with a microplate reader at a wavelength logical and pharmacological activities including anti- of 490 nm. Results were expressed as the per- oxidant, anti-inflammatory, antimutagenic, and anti- centage of MTS reduction, assuming that the ab- carcinogenic effects (Jang et al., 1997; Soleas et al., sorbance of control cells was 100%. For each ex- 1997; Surh, 1999). In previous studies, antioxidant periment, all treatments were performed in triplicate properties of resveratrol attenuated hippocampal cell wells. death and intracellular ROS formation (Bastianetto et al., 2000). Neuroprotective activities against exci- totoxic brain damage (Virgili and Contestabile, 2000) Nuclear staining for assessment of apoptosis and anti-apoptotic effects by caspase activation SH-SY5Y cells were stained with the chromatin- (Nicolini et al., 2001) suggest a putative neuropro- specific dye Hoechst 33324 (Molecular Probes, tective action for resveratrol. Eugene, OR). The SH-SY5Y cells on the chamber In the present study, we have examined the po- culture slide were incubated for 2 days, and then ssible protective effect of resveratrol against apop- treated with or without the resveratrol and DA at tosis induced by DA in human derived neurotypic different concentrations. SH-SY5Y cells were fixed cell, SH-SY5Y. Our results indicate that DA indeed for 10 min with 3.5% paraformaldehyde in PBS at triggers apoptosis and this deleterious effect can be room temperature. After twice rinses with PBS, the attenuated by resveratrol. cells were stained with 10 g/ml Hoechst 33324 in o PBS for 10 min at 37 C. Mounted slides were analyzed under a fluorescence microscope (Axiovert Materials and Methods 135, ZEISS, Germany) using a mercury lamp through a 360-370 nm bandpass filter. Light emitted Materials from Hoechst dye was collected through a 420 nm MEM, FBS and penicillin and streptomycin were longpass filter. obtained from Gibco BRL (Grand Island, NY). Re- sveratrol, dopamine, DMSO, Hoechst 33254, pro- Measurement of mitochondrial membrane potential pidium iodide (PI) were obtained from Sigma (St. Louis, MO). DA and resveratrol were dissolved in The level of mitochondrial membrane potential (MMP) sterilized H2O and in DMSO, respectively. Annexin V was determined by flow cytometry and the fluore- was from BD Biosciences (Palo Alto, CA). Mono- scent dye rhodamine 123. The rhodamine 123 data clonal antibodies against caspase-3, Bcl-2, cleavage were recorded using an FL-1 photomultiplier. Sample form of PARP were obtained from Cell Signaling data (10,000 cells) were used to prepare histograms Technology (Danvers, MA). Bicinchoninic acid pro- of the Cell Quest data analysis program (Becton tein assay kit and ECL chemiluminescence system Dickinson). were obtained from Pierce (Rockford, IL). Flow cytometric analysis using Annexin V and PI Cell culture SH-SY5Y cells were centrifuged to remove the me- Catecholaminergic neuroblastoma SH-SYSY cells dium, washed with PBS and stained with Annexin were grown in MEM supplemented with 10% FBS, V-FITC and PI in binding buffer (10 mM Hepes, 140 100 U/ml penicillin, and 100 g/ml streptomycin. mM NaCl, 2.5 mM CaCl2). Ten thousand events Cells were maintained in a humidified atmosphere of were collected on each sample. Stained cells were o 5% CO2, at 37 C. The cells were plated at an appro- analyzed using a FACScalibur (Becton Dickinson, priate density according to each experimental scale. Mountain View, CA) in the FL1-H and FL2-H channels. Cell viability assay Immunoblot analysis Cell viability was determined using Cell Titer 96 Aqu- Blotting was performed essentially as described eous Non-Radioactive Cell Proliferation Assay, availa- previously (Schulz et al., 1999). The cells treated ble from Promega Corp (Madison, WI). MTS (3-(4,5- with or without resveratrol and DA, were washed dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2- once with ice-cold PBS and then lysed using ice- (4-sulfophenyl)-2H-tetrazo-lium inner salt) conversion cold RIPA buffer and protease inhibitor cocktail o assay was performed according to the protocol sup- (Sigma) at 4 C for 30 min. Cell lysates were cen- plied by the manufacturer. In brief, a mixture of MTS trifuged at 13,000 rpm for 25 min, and the protein and PMS (phenazine methosulfate) was added to concentrations were determined by the bicinchoninic the treated SH-SY5Y cells cultured in 96-well plates acid method (Pierce, Rockford, IL) using BSA as 378 Exp. Mol. Med. Vol. 39(3), 376-384, 2007 standard. The protein lysates were separated by resveratrol slightly but significantly increased cell 12% SDS-PAGE and transferred to nitrocellulose proliferation and DA-induced apoptotic effects were membrane (Bio-Rad, CA). Protein expression was markedly attenuated by the co-presence of 3 or 5 M detected using primary antibodies and secondary resveratrol (Figure 1C). antibodies conjugated with HRP. Resveratrol attenuated DA-induced apoptotic cell Ressults death SH-SY5Y cells treated for 24 h with DA at con- Resveratrol protected SH-SY5Y cells against centrations of 300 and 500 M exhibited morpho- DA-induced cytotoxicity logical alterations such as cell shrinkage and mem- DA concentrations from 0 to 500 M were tested brane blebbing that are normally associated with the and demonstrated that DA is capable of induce occurrence of apoptotic cell death. Compared to the metabolic interruption in SH-SY5Y cells in a dose normal SH-SY5Y cells (Figure 2A), cells treated with range of 300-500 M (Figure 1A). DA decreased cell DA round up, detached from the bottom, and ag- viability concentration over time (Figure 1B). Prior gregated as assessed by phase-contrast microscopy studies have shown that resveratrol at up to 10 M (Figure 2B and D).