Mechanisms of resveratrol-induced changes in cytosolic free calcium ion concentrations and cell viability in OC2 human oral cancer cells

Author:

Chang H-J1,Chou C-T23,Chang H-T45,Liang W-Z6,Hung T-Y7,Li Y-D7,Fang Y-C7,Kuo C-C8,Kuo D-H9,Shieh P9,Jan C-R6

Affiliation:

1. Department of Dentistry, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan

2. Department of Nursing, Division of Basic Medical Sciences, Chang Gung University of Science and Technology, Chia-Yi, Taiwan

3. Chronic Diseases and Health Promotion Research Center, Chang Gung University of Science and Technology, Chia-Yi, Taiwan

4. Department of Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan

5. College of Management, National Sun Yat-sen University, Kaohsiung, Taiwan

6. Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan

7. Department of Laboratory Medicine, Zuoying Armed Forces General Hospital, Kaohsiung, Taiwan

8. Department of Nursing, Tzu Hui Institute of Technology, Pingtung, Taiwan

9. Department of Pharmacy, Tajen University, Pingtung, Taiwan

Abstract

Resveratrol is a natural compound that affects cellular calcium (Ca2+) homeostasis and viability in different cells. This study examined the effect of resveratrol on cytosolic free Ca2+ concentrations ([Ca2+]i) and viability in OC2 human oral cancer cells. The Ca2+-sensitive fluorescent dye fura-2 was used to measure [Ca2+]i, and water-soluble tetrazolium-1 was used to measure viability. Resveratrol evoked concentration-dependent increase in [Ca2+]i. The response was reduced by removing extracellular Ca2+. Resveratrol also caused manganese-induced fura-2 fluorescence quench. Resveratrol-evoked Ca2+ entry was inhibited by nifedipine and the protein kinase C (PKC) inhibitor GF109203X but was not altered by econazole, SKF96365, and the PKC activator phorbol 12-myristate 13 acetate. In Ca2+-free medium, treatment with the endoplasmic reticulum Ca2+ pump inhibitor 2,5-di- tert-butylhydroquinone (BHQ) abolished resveratrol-evoked [Ca2+]i rise. Conversely, treatment with resveratrol inhibited BHQ-evoked [Ca2+]i rise. Inhibition of phospholipase C (PLC) with U73122 abolished resveratrol-evoked [Ca2+]i rise. At 20–100 μM, resveratrol decreased cell viability, which was not affected by chelating cytosolic Ca2+with 1,2-bis(2-aminophenoxy)ethane- N, N, N′, N′-tetraacetic acid-acetoxymethyl ester. Annexin V-fluorescein isothiocyanate staining data suggest that resveratrol at 20–40 μM induced apoptosis in a concentration-dependent manner. Collectively, in OC2 cells, resveratrol induced [Ca2+]i rise by evoking PLC-dependent Ca2+ release from the endoplasmic reticulum and by causing Ca2+ entry via nifedipine-sensitive, PKC-regulated mechanisms. Resveratrol also caused Ca2+-independent apoptosis.

Publisher

SAGE Publications

Subject

Health, Toxicology and Mutagenesis,Toxicology,General Medicine

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