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Int. J. Mol. Sci. 2016, 17(7), 1113; doi:10.3390/ijms17071113

Cellular Stress and p53-Associated Apoptosis by Juniperus communis L. Berry Extract Treatment in the Human SH-SY5Y Neuroblastoma Cells

1
Division of Pharmaceutical Biosciences, Faculty of Pharmacy, University of Helsinki, Post Office Box 56 (Viikinkaari 5E), Helsinki 00014, Finland
2
Department of Pathophysiology, Institute of Biomedicine and Translational Medicine, University of Tartu, 19 Ravila Street, Tartu 50411, Estonia
3
Division of Pharmacology & Pharmacotherapy, Faculty of Pharmacy, University of Helsinki, Post Office Box 56 (Viikinkaari 5E), Helsinki 00014, Finland
4
Department of Physiology, Institute of Biomedicine and Translational Medicine, University of Tartu, 19 Ravila Street, Tartu 50411, Estonia
Deceased.
*
Author to whom correspondence should be addressed.
Academic Editor: Anthony Lemarié
Received: 28 April 2016 / Revised: 27 June 2016 / Accepted: 28 June 2016 / Published: 13 July 2016
(This article belongs to the Collection Programmed Cell Death and Apoptosis)
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Abstract

Plant phenolics have shown to activate apoptotic cell death in different tumourigenic cell lines. In this study, we evaluated the effects of juniper berry extract (Juniperus communis L.) on p53 protein, gene expression and DNA fragmentation in human neuroblastoma SH-SY5Y cells. In addition, we analyzed the phenolic composition of the extract. We found that juniper berry extract activated cellular relocalization of p53 and DNA fragmentation-dependent cell death. Differentially expressed genes between treated and non-treated cells were evaluated with the cDNA-RDA (representational difference analysis) method at the early time point of apoptotic process when p53 started to be activated and no caspase activity was detected. Twenty one overexpressed genes related to cellular stress, protein synthesis, cell survival and death were detected. Interestingly, they included endoplasmic reticulum (ER) stress inducer and sensor HSPA5 and other ER stress-related genes CALM2 and YKT6 indicating that ER stress response was involved in juniper berry extract mediated cell death. In composition analysis, we identified and quantified low concentrations of fifteen phenolic compounds. The main groups of them were flavones, flavonols, phenolic acids, flavanol and biflavonoid including glycosides of quercetin, apigenin, isoscutellarein and hypolaetin. It is suggested that juniper berry extract induced the p53-associated apoptosis through the potentiation and synergism by several phenolic compounds. View Full-Text
Keywords: apoptosis; Juniperus communis L.; plant extract; ER stress; p53; SH-SY5Y neuroblastoma cells apoptosis; Juniperus communis L.; plant extract; ER stress; p53; SH-SY5Y neuroblastoma cells
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MDPI and ACS Style

Lantto, T.A.; Laakso, I.; Dorman, H.J.D.; Mauriala, T.; Hiltunen, R.; Kõks, S.; Raasmaja, A. Cellular Stress and p53-Associated Apoptosis by Juniperus communis L. Berry Extract Treatment in the Human SH-SY5Y Neuroblastoma Cells. Int. J. Mol. Sci. 2016, 17, 1113.

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