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ORIGINAL ARTICLE
Year : 2022  |  Volume : 65  |  Issue : 1  |  Page : 30-36

Hydroxytyrosol [2-(3,4-dihydroxyphenyl)-ethanol], a natural phenolic compound found in the olive, alters Ca2+ signaling and viability in human HepG2 hepatoma cells


1 Department of Medicine, Chang Bing Show Chwan Memorial Hospital, Changhua, Taiwan
2 Department of Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
3 Department of Pharmacy, Kaohsiung Veterans General Hospital Tainan Branch; Department of Pharmaceutical Science and Technology, Chung Hwa University of Medical Technology, Tainan, Taiwan
4 Departmentnt of Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
5 Department of Rehabilitation, Kaohsiung Veterans General Hospital, Kaohsiung, Kaohsiung, Taiwan
6 Department of Pediatrics, Ping Tung Christian Hospital, Pingtung, Taiwan
7 Department of Nursing, Tzu Hui Institute of Technology, Pingtung, Taiwan
8 Department of Endocrinology and Metabolism, Kaohsiung Veteran General Hospital Tainan Branch; Department of Nursery, Chung Hwa University of Medical Technology, Tainan, Taiwan
9 Department of Nursery, Chung Hwa University of Medical Technology, Tainan; Department of Nursing, Division of Basic Medical Sciences, Chang Gung University of Science and Technology, Chiayi Campus, Chiayi, Taiwan
10 Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan

Correspondence Address:
Dr. Chiang-Ting Chou
Department of Nursery, Chung Hwa University of Medical Technology, Tainan; Department of Nursing, Division of Basic Medical Sciences, Chang Gung University of Science and Technology, Chiayi Campus, Chiayi
Taiwan
Prof. Chung-Ren Jan
Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung
Taiwan
Dr. Lyh-Jyh Hao
Department of Endocrinology and Metabolism, Kaohsiung Veteran General Hospital Tainan Branch; Department of Nursery, Chung Hwa University of Medical and Technology, Tainan
Taiwan
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/cjp.cjp_74_21

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Hepatotoma is the leading type of primary liver cancer in adults and third cause of death in the world. Hydroxytyrosol is a natural phenol existing in olive (Olea europaea L.). Hydroxytyrosol is the chief ingredient of olive oil, which was early deemed to be the most robust antioxidant in olive oil. Hydroxytyrosol is known to inhibit various types of cancer by different methods. This study was aimed to delineate the action of hydroxytyrosol on viability and [Ca2+]i in HepG2 hepatoma cells. Fura-2 was used to detect [Ca2+]i, and WST-1 assays were applied to explore cell cytotoxicity. Hydroxytyrosol elicited [Ca2+]i raises. Eliminating external Ca2+ diminished the Ca2+ signal by 30%. Hydroxytyrosol-evoked Ca2+ influx was diminished by 20% by three inhibitors of store-operated Ca2+ channels and by a protein kinase C activator and an inhibitor. In the absence of Ca2+, thapsigargin eradicated hydroxytyrosol-provoked [Ca2+]i raises. Suppression of phospholipase C (PLC) with U73122, a PLC inhibitor, did not inhibit hydroxytyrosol-elicited [Ca2+]i raises. Hydroxytyrosol reduced cell viability. This cytotoxic action was not reversed by preincubation with BAPTA/AM, a cytosolic Ca2+ binder. In sum, in HepG2 hepatoma cells, hydroxytyrosol elicited [Ca2+]i raises by provoking PLC-unrelated discharge of Ca2+ from ER and Ca2+ influx through PKC-sensitive store-operated Ca2+ entry. In addition, hydroxytyrosol elicited Ca2+-dissociated cytotoxicity.


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