Nat Prod Sci.  2018 Dec;24(4):219-224. 10.20307/nps.2018.24.4.219.

The Cytotoxic Constituents of Betula platyphylla and their Effects on Human Lung A549 Cancer Cells

Affiliations
  • 1Research Institute of Pharmaceutical Sciences, College of Pharmacy, Kyungpook National University, Daegu 41566, Republic of Korea. kssong@knu.ac.kr
  • 2Biological and Genetic Resources Assessment Division, National Institute of Biological Resources, Incheon 22689, Republic of Korea.

Abstract

During the screening for cytotoxic compounds from plants grown in Korea, Betula platyphylla (BP) showed potent activity against the adenocarcinomic human alveolar basal epithelial A549 cell line. To identify the cytotoxic components from BP, the CHâ‚‚Clâ‚‚ fraction with the most significant cytotoxic effect was applied to the column chromatographies. Seven compounds were isolated: lupeol (1), betulinic acid (2), (−)-rhododendrol (3), platyphyllenone (4), platyphyllone (5), (−)-centrolobol (6), and oleanolic acid (7). Among them, three diarylheptanoids (4 - 6) exhibited cytotoxicity toward A549 cells. Especially, 50 µM of 4 reduced A549 cell viability to 18.93 ± 0.82% compared to control (100.00 ± 21.48%). Lactate dehydrogenase (LDH) leakage and intracellular reactive oxygen species (ROS) production were also induced by 50 µM 4. This is the first report on the cytotoxic effect of BP-derived diarylheptanoids 4-6 against A549 cells. The compound 4 may be useful for the development of early hit compounds for non-small cell lung carcinoma, but the consideration about selectivity of 4 is required since 4 also showed the cytotoxicity in the human normal lung epithelial BEAS-2B cell line.

Keyword

Betula platyphylla; diarylheptanoids; platyphyllenone; A549; cytotoxicity

MeSH Terms

Betula*
Cell Line
Cell Survival
Chromatography
Diarylheptanoids
Humans*
Korea
L-Lactate Dehydrogenase
Lung*
Mass Screening
Oleanolic Acid
Reactive Oxygen Species
Diarylheptanoids
L-Lactate Dehydrogenase
Oleanolic Acid
Reactive Oxygen Species

Figure

  • Fig. 1 The cytotoxic effects of Betula platyphylla (BP) extract (200 µg/mL) on A549 cells. Doxorubicin (DOX; 5 µM; A549 cell viability, 19.69 ± 2.84%) was used as a positive control. *, p < 0.05 compared with the control group (CNT).

  • Fig. 2 The cytotoxic effects of the partitioned fractions from BP on A549 cells. DOX (5 µM; A549 cell viability, 20.57 ± 2.62%) was used as a positive control. *, p < 0.05 compared with CNT.

  • Fig. 3 The isolated compounds from the CH2Cl2 fraction of BP.

  • Fig. 4 The cytotoxic effects of isolated compounds 1 – 7 from BP on A549 cells. DOX (5 µM; A549 cell viability, 28.39 ± 6.21%) was used as a positive control. *, p < 0.05 compared with CNT.

  • Fig. 5 The lactate dehydrogenase (LDH) leakage induced by platyphyllenone (4) in A549 cells. DOX (5 µM; LDH leakage, 10.46 ± 0.90-fold) was used as a positive control. *, p < 0.05 compared with CNT.

  • Fig. 6 The effect of platyphyllenone (4) on the production of intracellular reactive oxygen species (ROS) in A549 cells. DOX (5 µM; intracellular ROS, 4.99 ± 0.20-fold) was used as a positive control. *, p < 0.05 compared with CNT.

  • Fig. 7 The effects of isolated compounds 1 – 7 on BEAS-2B cell viability. DOX (5 µM) reduced cell viability to 27.04 ± 2.11%. *, p < 0.05 compared with the CNT.


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