The Effect of Hispidulin, a Flavonoid from Salvia Plebeia, on Human Nasopharyngeal Carcinoma CNE-2Z Cell Proliferation, Migration, Invasion, and Apoptosis
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molecules Article The Effect of Hispidulin, a Flavonoid from Salvia plebeia, on Human Nasopharyngeal Carcinoma CNE-2Z Cell Proliferation, Migration, Invasion, and Apoptosis Yiqun Dai 1,2, Xiaolong Sun 1, Bohan Li 1, Hui Ma 1, Pingping Wu 1, Yingping Zhang 1, Meilin Zhu 1, Hong-Mei Li 1, Minjian Qin 2,* and Cheng-Zhu Wu 1,* 1 School of Pharmacy, Bengbu Medical College, 2600 Donghai Road, Bengbu 233030, China; [email protected] (Y.D.); [email protected] (X.S.); [email protected] (B.L.); [email protected] (H.M.); [email protected] (P.W.); [email protected] (Y.Z.); [email protected] (M.Z.); [email protected] (H.-M.L.) 2 Department of Resources Science of Traditional Chinese Medicines, School of Traditional Chinese Pharmacy and State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing 210009, China * Correspondence: [email protected] (M.Q.); [email protected] (C.-Z.W.); Tel.: +86-25-8618-5130 (M.Q.); +86-55-2317-5232 (C.-Z.W.) Abstract: Nasopharyngeal carcinoma (NPC) is a common malignant head and neck tumor. Drug resistance and distant metastasis are the predominant cause of treatment failure in NPC patients. Citation: Dai, Y.; Sun, X.; Li, B.; Ma, Hispidulin is a flavonoid extracted from the bioassay-guided separation of the EtOH extract of Salvia H.; Wu, P.; Zhang, Y.; Zhu, M.; Li, plebeia with strong anti-proliferative activity in nasopharyngeal carcinoma cells (CNE-2Z). In this H.-M.; Qin, M.; Wu, C.-Z. The Effect study, the effects of hispidulin on proliferation, invasion, migration, and apoptosis were investigated of Hispidulin, a Flavonoid from Salvia in CNE-2Z cells. The [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] (MTT) assay plebeia, on Human Nasopharyngeal and the colony formation assay revealed that hispidulin could inhibit CNE-2Z cell proliferation. Carcinoma CNE-2Z Cell Proliferation, µ Migration, Invasion, and Apoptosis. Hispidulin (25, 50, 100 M) also induced apoptosis in a dose-dependent manner in CNE-2Z cells. Molecules 2021, 26, 1604. https:// The expression of Akt was reduced, and the expression of the ratio of Bax/Bcl-2 was increased. doi.org/10.3390/molecules26061604 In addition, scratch wound and transwell assays proved that hispidulin (6.25, 12.5, 25 µM) could inhibited the migration and invasion in CNE-2Z cells. The expressions of HIF-1α, MMP-9, and Academic Editors: Yasuyoshi Miyata, MMP-2 were decreased, while the MMPs inhibitor TIMP1 was enhanced by hispidulin. Moreover, Won Sup Lee, Dehai Li, hispidulin exhibited potent suppression tumor growth and low toxicity in CNE-2Z cancer-bearing Natthida Weerapreeyakul and mice at a dosage of 20 mg/kg/day. Thus, hispidulin appears to be a potentially effective agent for Kittisak Likhitwitayawuid NPC treatment. Received: 16 February 2021 Keywords: hispidulin; nasopharyngeal carcinoma; apoptosis; invasion; migration Accepted: 11 March 2021 Published: 14 March 2021 Publisher’s Note: MDPI stays neutral 1. Introduction with regard to jurisdictional claims in published maps and institutional affil- Nasopharyngeal carcinoma (NPC) is one of the most common head and neck ma- iations. lignant tumor. It has a very unique distribution pattern and is much more prevalent in southeast Asia [1,2]. The conventional treatment for patients with NPC is chemotherapy and radiotherapy. Although the treatments have revealed good efficacy, high recurrence and metastasis become the major cause of treatment failure and have a poor prognosis [3]. Therefore, it is necessary to look for more effective therapeutic drugs for treating NPC. Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. Traditional Chinese herbal medicine has become an important source of antitumor This article is an open access article drugs and tumor adjuvant therapy with unique biological activities and few side effects. distributed under the terms and Salvia plebeia R. Brown is a traditional Chinese folk herb that belongs to the family Lamiaceae conditions of the Creative Commons and is abundant in many countries, especially in China and India. It has been used as Attribution (CC BY) license (https:// a folk herbal medicine for treating inflammatory diseases such as nephritis, pharyngitis, creativecommons.org/licenses/by/ bronchitis, colds, and coughs, etc. [4–6]. In addition, there are also reports suggesting 4.0/). that S. plebeia has antitumor activity [7,8]. Although clinical treatment of tumors and the Molecules 2021, 26, 1604. https://doi.org/10.3390/molecules26061604 https://www.mdpi.com/journal/molecules Molecules 2021, 26, x FOR PEER REVIEW 2 of 11 Molecules 2021, 26, 1604 2 of 11 that S. plebeia has antitumor activity [7,8]. Although clinical treatment of tumors and the antitumor poperties of S. plebeia extracts have been reported, no study has reported the bioassay-guided isolation of the active principle responsible for the antitumor activity. antitumorFlavonoids poperties are of theS. plebeiamain chemicalextracts haveconstituents been reported, of S. plebeia no study, which has has reported multiple the phar- bioassay-guidedmacological effects isolation and of low the toxicities. active principle Hispidulin responsible (4′,5,7-trihydroxy for the antitumor-6-methoxyflavone) activity. is a Flavonoidsflavonoid obtained are the main from chemical S. plebeia constituents and has several of S. plebeiapharmacological, which has multipleactivities phar-such as 0 macologicalantioxidative, effects anti and-inflammatory, low toxicities. anti Hispidulin-epileptic, (4hepatoprotective,5,7-trihydroxy-6-methoxyflavone) activities [9–12]. Note- is aworthy, flavonoid accumulating obtained from studiesS. plebeia have anddemonstrated has several the pharmacological anti-cancer activity activities of hispidulin such as in antioxidative,renal cell carcinoma, anti-inflammatory, gallbladder anti-epileptic, cancer, acute hepatoprotective myeloid leukemia, activities hepatocellular [9–12]. Note- carci- worthy,noma, accumulating and colorectal studies cancer have by causing demonstrated growth theinhibition, anti-cancer cell activitycycle arres of hispidulint, apoptotic in acti- renalvation, cell carcinoma, and metastasis gallbladder suppression cancer, [13]. acute However, myeloid leukemia,its anti-cancer hepatocellular activity on carcinoma, NPC remain andpoorly colorectal understood. cancer by Therefore, causing growthour study inhibition, aimed to cell explore cycle whether arrest, apoptotic hispidulin activation, is the main andeff metastasisective anti suppression-cancer component [13]. However, in S. plebeia its anti-cancerand investigate activityd the on anti NPC-cancer remain effects poorly of his- understood.pidulin on Therefore, NPC. our study aimed to explore whether hispidulin is the main effective anti-cancer component in S. plebeia and investigated the anti-cancer effects of hispidulin on2. NPC. Results 2. Results2.1. Isolation of Hispidulin from the Bioassay-Guided Fractionation of the EtOH Extract of S. 2.1.plebeia Isolation of Hispidulin from the Bioassay-Guided Fractionation of the EtOH Extract of S. plebeiaFirstly, we measured the cytotoxic effect of EtOH extract of S. plebeia on CNE-2Z cells. TheFirstly, crude we extract measured significantly the cytotoxic decreased effect ofCNE EtOH-2Z extract cell viability of S. plebeia (Figureon CNE-2Z1a). To look cells. for Thewhat crude components extract significantly are related decreased to the anti CNE-2Z-cancer celleffects viability of crude (Figure extract1a). of To S. look plebeia for, the whatcrude components extract was are suspended related to in the water anti-cancer and sequentially effects of partitioned crude extract with of petroleumS. plebeia, the ether, crudeCH extract2Cl2, ethyl was acetate suspended, and inn-butanol, water and respectively. sequentially The partitioned fractions withwere petroleum subjected ether,to a cell CHproliferation2Cl2, ethyl acetate, assay. andThe n-butanol,results showed respectively. that CH2 TheCl2 fraction fractions has were stronger subjected growth to a cellinhibi- proliferationtion on CNE assay.-2Z Thecells results than other showed fractions that CH (Figure2Cl2 fraction 1b). Based has on stronger this result, growth CH inhibition2Cl2 fraction onwas CNE-2Z chosen cells for than further other purification fractions to (Figure find the1b). active Based compound. on this result, High CH-performance2Cl2 fraction liquid waschromatography chosen for further (HPLC) purification analysis to findrevealed the active a major compound. peak in High-performancethe CH2Cl2 fraction liquid (Figure chromatography1c). The CH2Cl (HPLC)2 fraction analysis was chromatogr revealed aaphed major peakon a silica in the gel CH column2Cl2 fraction and Sephadex (Figure1c). LH- The20, CH and2Cl the2 fraction major compound was chromatographed was gained. The on a structure silica gel of column the compound and Sephadex was determined LH-20, andas the hispidulin major compound (Figure 1c) was by comparing gained. The the structure nuclear ofmagnetic the compound resonance was (NMR) determined data with as hispidulinprevious literature (Figure1 c)[14] by. The comparing purity of the hispidulin nuclear magnetic was higher resonance than 98% (NMR) by HPLC data analysis. with previous literature [14]. The purity of hispidulin was higher than 98% by HPLC analysis. Figure 1. Effects of EtOH extract and fractions from S. plebeia on cell viability in CNE-2Z cells. (a) CNE-2Z cells were Figure 1. Effects of EtOH extract and fractions from S. plebeia on cell viability