AKT serine/threonine protein kinase modulates baicalin-triggered autophagy in human bladder cancer T24 cells

Lin,Chingju; Tsai,Shih-Chang; Tseng,Michael  T.; Peng,Shu-Fen; Kuo,Sheng-Chu; Lin,Meng-Wei; Hsu,Yuan-Man; Lee,Miau-Rong; Amagaya,Sakae; Huang,Wen-Wen; Wu,Tian-Shung; Yang,Jai-Sing

doi:10.3892/ijo.2013.1791

AKT serine/threonine protein kinase modulates baicalin-triggered autophagy in human bladder cancer T24 cells

Authors:
- Chingju Lin
- Shih-Chang Tsai
- Michael T. Tseng
- Shu-Fen Peng
- Sheng-Chu Kuo
- Meng-Wei Lin
- Yuan-Man Hsu
- Miau-Rong Lee
- Sakae Amagaya
- Wen-Wen Huang
- Tian-Shung Wu
- Jai-Sing Yang
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Affiliations: Department of Physiology, China Medical University, Taichung 404, Taiwan, R.O.C., Department of Biological Science and Technology, China Medical University, Taichung 404, Taiwan, R.O.C., Department of Anatomical Sciences and Neurobiology, School of Medicine, University of Louisville, KY 40202, USA, Graduate Institute of Pharmaceutical Chemistry, China Medical University, Taichung 404, Taiwan, R.O.C., Department of Nursing, Cardinal Tien College of Healthcare and Management, Taipei 23143, Taiwan, R.O.C., Department of Biochemistry, China Medical University, Taichung 404, Taiwan, R.O.C., Department of Kampo Pharmaceutical Sciences, Nihon Pharmaceutical University, Saitama 362-0806, Japan, Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan, R.O.C., Department of Pharmacology, China Medical University, Taichung 404, Taiwan, R.O.C.
Published online on: January 23, 2013 https://doi.org/10.3892/ijo.2013.1791
Pages: 993-1000

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Abstract

Baicalin is one of the major compounds in the traditional Chinese medicinal herb from Scutellaria baicalensis Georgi. We investigated the molecular mechanisms of cell autophagy induced by baicalin in human bladder cancer T24 cells. Baicalin inhibited cell survival as shown by MTT assay and increased cell death by trypan blue exclusion assay in a concentration-dependent manner. Baicalin did not induce apoptotic cell death in T24 cells by TUNEL and caspase-3 activity assay. Baicalin induced the acidic vesicular organelle cell autophagy marker, manifested by acridine orange (AO) and monodansylcadaverine (MDC) staining and cleavage of microtubule-associated protein 1 light chain 3 (LC3). The protein expression levels of the Atg 5, Atg 7, Atg 12, Beclin-1 and LC3-II were upregulated in T24 cells after baicalin treatment. Inhibition of autophagy by 3-methyl-adenine (an inhibitor of class III phosphatidylinositol-3 kinase; 3-MA) reduced the cleavage of LC3 in T24 cells after baicalin treatment. Furthermore, protein expression levels of phospho-AKT (Ser473) and enzyme activity of AKT were downregulated in T24 cells after baicalin treatment. In conclusion, baicalin triggered cell autophagy through the AKT signaling pathway in T24 cells.

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