The anti-cancer effects and mechanisms of Scutellaria barbata D. Don on CL1-5 lung cancer cells

// Chin-Chuan Chen 1, 2 , Chun-Pin Kao 3 , Mei-Miao Chiu 4 and Shu-Huei Wang 5 1 Graduate Institute of Natural Products, Chang Gung University, Taoyuan, Taiwan, Chinese Herbal Medicine Research Team, Healthy Aging Research Center, Chang Gung University, Taoyuan, Taiwan 2 Tissue Bank, Chang Gung Memorial Hospital, Taoyuan, Taiwan 3 Department of Nursing, Hsin Sheng Junior College of Medical Care and Management, Taoyuan, Taiwan 4 Department of Medicine, Mackay Medical College, New Taipei, Taiwan, Republic of China 5 Department of Anatomy and Cell Biology, College of Medicine, National Taiwan University, Taipei, Taiwan Correspondence to: Shu-Huei Wang, email: shwang@ntu.edu.tw Keywords: Scutellaria barbata D. Don; apoptosis; ER-stress; P38/MAPK; G2/M phase arrest Received: August 24, 2017 Accepted: October 29, 2017 Published: November 27, 2017 ABSTRACT Lung cancer, with a poor prognosis and resistance to chemotherapy, is the most common malignant tumor and has the highest mortality rate worldwide. Scutellaria barbata D. Don (SB), which is derived from the dried whole plant of Labiatae, is a well-known anti-inflammatory and anti-cancer herb. The aim of this study was to examine the anti-cancer effects and precise regulatory mechanisms of SB in CL1-5 lung cancer cells. In an in vitro assay, we found that the anti-tumor mechanism of SB was due to P38/SIRT1-regulated cell apoptosis through G2/M phase arrest and ER stress-, intrinsic mitochondrial-, and extrinsic FAS/FASL-mediated pathways. Autophagy also plays a key role in SB-induced CL1-5 cell cytotoxicity. In addition, SB exerts additive effects with etoposide or cisplatin in lung cancer cells. In an in vivo assay, we found that SB significantly reduces tumor size with decreased proliferation and angiogenesis, as well as increased apoptosis and autophagy in CL1-5 tumor-bearing mice. These findings provided experimental evidence for the application of SB in the treatment of lung cancer.