Open Access

Quercetin induces tongue squamous cell carcinoma cell apoptosis via the JNK activation‑regulated ERK/GSK‑3α/β‑mediated mitochondria‑dependent apoptotic signaling pathway

  • Authors:
    • Chun-Fa Huang
    • Shing-Hwa Liu
    • Tsung-Jung Ho
    • Kuan-I Lee
    • Kai-Min Fang
    • Wu-Chia Lo
    • Jui-Ming Liu
    • Chin-Ching Wu
    • Chin-Chuan Su
  • View Affiliations

  • Published online on: January 11, 2022     https://doi.org/10.3892/ol.2022.13198
  • Article Number: 78
  • Copyright: © Huang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Tongue squamous cell carcinoma (SCC) is a most common type of oral cancer. Due to its highly invasive nature and poor survival rate, the development of effective pharmacological therapeutic agents is urgently required. Quercetin (3,3',4',5,7‑pentahydroxyflavone) is a polyphenolic flavonoid found in plants and is an active component of Chinese herbal medicine. The present study investigated the pharmacological effects and possible mechanisms of quercetin on apoptosis of the tongue SCC‑derived SAS cell line. Following treatment with quercetin, cell viability was assessed via the MTT assay. Apoptotic and necrotic cells, mitochondrial transmembrane potential and caspase‑3/7 activity were analyzed via flow cytometric analyses. A caspase‑3 activity assay kit was used to detect the expression of caspase‑3 activity. Western blot analysis was performed to examine the expression levels of proteins associated with the MAPKs, AMPKα, GSK3‑α/β and caspase‑related signaling pathways. The results revealed that quercetin induced morphological alterations and decreased the viability of SAS cells. Quercetin also increased apoptosis‑related Annexin V‑FITC fluorescence and caspase‑3 activity, and induced mitochondria‑dependent apoptotic signals, including a decrease in mitochondrial transmembrane potential and Bcl‑2 protein expression, and an increase in cytosolic cytochrome c, Bax, Bak, cleaved caspase‑3, cleaved caspase‑7 and cleaved poly (ADP‑ribose) polymerase protein expression. Furthermore, quercetin significantly increased the protein expression levels of phosphorylated (p)‑ERK, p‑JNK1/2 and p‑GSK3‑α/β, but not p‑p38 or p‑AMPKα in SAS cells. Pretreatment with the pharmacological JNK inhibitor SP600125 effectively reduced the quercetin‑induced apoptosis‑related signals, as well as p‑ERK1/2 and p‑GSK3‑α/β protein expression. Both ERK1/2 and GSK3‑α/β inhibitors, PD98059 and LiCl, respectively, could significantly prevent the quercetin‑induced phosphorylation of ERK1/2 and GSK3‑α/β, but not JNK activation. Taken together, these results suggested that quercetin may induce tongue SCC cell apoptosis via the JNK‑activation‑regulated ERK1/2 and GSK3‑α/β‑mediated mitochondria‑dependent apoptotic signaling pathway.
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March-2022
Volume 23 Issue 3

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Spandidos Publications style
Huang C, Liu S, Ho T, Lee K, Fang K, Lo W, Liu J, Wu C and Su C: Quercetin induces tongue squamous cell carcinoma cell apoptosis via the JNK activation‑regulated ERK/GSK‑3α/β‑mediated mitochondria‑dependent apoptotic signaling pathway. Oncol Lett 23: 78, 2022
APA
Huang, C., Liu, S., Ho, T., Lee, K., Fang, K., Lo, W. ... Su, C. (2022). Quercetin induces tongue squamous cell carcinoma cell apoptosis via the JNK activation‑regulated ERK/GSK‑3α/β‑mediated mitochondria‑dependent apoptotic signaling pathway. Oncology Letters, 23, 78. https://doi.org/10.3892/ol.2022.13198
MLA
Huang, C., Liu, S., Ho, T., Lee, K., Fang, K., Lo, W., Liu, J., Wu, C., Su, C."Quercetin induces tongue squamous cell carcinoma cell apoptosis via the JNK activation‑regulated ERK/GSK‑3α/β‑mediated mitochondria‑dependent apoptotic signaling pathway". Oncology Letters 23.3 (2022): 78.
Chicago
Huang, C., Liu, S., Ho, T., Lee, K., Fang, K., Lo, W., Liu, J., Wu, C., Su, C."Quercetin induces tongue squamous cell carcinoma cell apoptosis via the JNK activation‑regulated ERK/GSK‑3α/β‑mediated mitochondria‑dependent apoptotic signaling pathway". Oncology Letters 23, no. 3 (2022): 78. https://doi.org/10.3892/ol.2022.13198