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Lee HR, Lee J, Kim HJ. Differential effects of MEK inhibitors on rat neural stem cell differentiation: Repressive roles of MEK2 in neurogenesis and induction of astrocytogenesis by PD98059. Pharmacol Res 2019; 149:104466. [PMID: 31562895 DOI: 10.1016/j.phrs.2019.104466] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 09/19/2019] [Accepted: 09/24/2019] [Indexed: 01/14/2023]
Abstract
Neural stem cells (NSCs) proliferate and differentiate into neurons and glia depending on the culture environment. However, the underlying mechanisms determining the fate of NSCs are not fully understood. Growth factors facilitate NSC proliferation through mitogen-activated protein kinase (MAPK)/extracellular signal-regulated kinase (ERK) kinase (MEK) and MAPK activation, and NSCs differentiate into neurons, astrocytes, or oligodendrocytes when mitogens are withdrawn from the culture media. Here, we aimed to identify the effects and roles of MEK signaling on the determination of NSC fate. MEK inhibitors, U0126, SL327, and PD98059, had differential effects on NSC differentiation. U0126 and SL327, which are known to inhibit MEK1 and MEK2, induced neuronal differentiation, whereas PD98059, which is reported to preferentially inhibit MEK1 at higher concentrations, increased astrocytogenesis. Knockdown of MEK2 using small interfering RNA increased neurogenesis and over-expression of wild type (WT) MEK2 inhibited neurogenesis, suggesting a repressive role of MEK2 in neuronal differentiation. The chemical structure of PD98059 appears to be important for induction of astrocytogenesis because not only PD98059 (2'-amino-3'-methoxyflavone) but also its chemical structural mimetic, 3'-methoxyflavone, enhanced astrocytogenesis. Therefore, in our study, we suggest that MEK inhibitors have distinct functions in determining NSC fate. Inhibition of MEK2 is important for induction of neurogenesis in NSCs. U0126 and SL327 increase neurogenesis through MEK2 inhibition, whereas PD98059 induced astrocytogenesis in NSCs, which is mediated by the chemical structure, particularly the 3'-methoxy group rather than its renowned MEK1 inhibition.
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Affiliation(s)
- Ha-Rim Lee
- College of Pharmacy, Chung-Ang University, Seoul, Republic of Korea
| | - Jeewoo Lee
- College of Pharmacy, Seoul National University, Seoul, Republic of Korea
| | - Hyun-Jung Kim
- College of Pharmacy, Chung-Ang University, Seoul, Republic of Korea.
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Li Q, Chen Y, Zhao D, Yang S, Zhang S, Wei Z, Wang Y, Qian K, Zhao B, Zhu Y, Chen Y, Duan Y, Han J, Yang X. LongShengZhi Capsule reduces carrageenan-induced thrombosis by reducing activation of platelets and endothelial cells. Pharmacol Res 2019; 144:167-180. [PMID: 30986544 DOI: 10.1016/j.phrs.2019.04.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 03/31/2019] [Accepted: 04/11/2019] [Indexed: 12/17/2022]
Abstract
Formation of thrombosis is associated with activation of platelets and endothelial cells. The effect of LongShengZhi Capsule (LSZ), a traditional Chinese medicine used for treatment of vascular diseases, on thrombosis was investigated in this study. BALB/c mice were induced thrombosis by injection of carrageenan while receiving pre or simultaneous LSZ treatment. We also compared the therapeutic effects of LSZ and clopidogrel on formed thrombi. LSZ inhibited carrageenan-induced thrombi in mouse tissue vessels. In addition, LSZ but not clopidogrel reduced formed thrombi with a short time window. The reduction of thrombi by LSZ was associated with reduced serum P-selectin, reduced expression of TNF-α and P-selectin and activated matrix metalloproteinase 2 expression in tissues. In vitro, LSZ decreased thrombin-induced human platelet clot retraction which was associated with inactivation of AKT and ERK1/2. LSZ also reduced adhesion of platelets or THP-1 monocytes to human umbilical vein endothelial cells (HUVECs) induced by oxidized low-density lipoprotein or lipopolysaccharide. The anti-adherent actions of LSZ was attributed to reduction of oxidative stress, expression of platelet receptors (P2Y12, PAR4 and CD36) and AKT activity in platelets. LSZ also reduced adhesion molecules or tissue factor but activated tissue factor pathway inhibitor expression in HUVECs. Taken together, our study demonstrates the antithrombotic properties of LSZ by reducing activation of platelets and endothelial cells, and suggests its potential application in clinics.
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Affiliation(s)
- Qi Li
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials of Ministry of Education, Nankai University, Tianjin, China; Department of Pharmacological Sciences, Key Laboratory of Major Metabolic Diseases and Nutritional Regulation of Anhui Department of Education, Hefei University of Technology, Hefei, China
| | - Yi Chen
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials of Ministry of Education, Nankai University, Tianjin, China; Department of Pharmacological Sciences, Key Laboratory of Major Metabolic Diseases and Nutritional Regulation of Anhui Department of Education, Hefei University of Technology, Hefei, China
| | - Dan Zhao
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials of Ministry of Education, Nankai University, Tianjin, China
| | - Shu Yang
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials of Ministry of Education, Nankai University, Tianjin, China
| | - Shuang Zhang
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials of Ministry of Education, Nankai University, Tianjin, China
| | - Zhuo Wei
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials of Ministry of Education, Nankai University, Tianjin, China
| | - Yong Wang
- Buchang Pharmaceutical Co. Ltd., Xi'an, China
| | - Ke Qian
- Buchang Pharmaceutical Co. Ltd., Xi'an, China
| | | | - Yan Zhu
- Tianjin University of Traditional Chinese Medicine, Tianjin, China
| | - Yuanli Chen
- Department of Pharmacological Sciences, Key Laboratory of Major Metabolic Diseases and Nutritional Regulation of Anhui Department of Education, Hefei University of Technology, Hefei, China
| | - Yajun Duan
- Department of Pharmacological Sciences, Key Laboratory of Major Metabolic Diseases and Nutritional Regulation of Anhui Department of Education, Hefei University of Technology, Hefei, China
| | - Jihong Han
- Department of Biochemistry and Molecular Biology, State Key Laboratory of Medicinal Chemical Biology, Key Laboratory of Bioactive Materials of Ministry of Education, Nankai University, Tianjin, China; Department of Pharmacological Sciences, Key Laboratory of Major Metabolic Diseases and Nutritional Regulation of Anhui Department of Education, Hefei University of Technology, Hefei, China.
| | - Xiaoxiao Yang
- Department of Pharmacological Sciences, Key Laboratory of Major Metabolic Diseases and Nutritional Regulation of Anhui Department of Education, Hefei University of Technology, Hefei, China.
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Jung HJ, Kang JH, Choi S, Son YK, Lee KR, Seong JK, Kim SY, Oh SH. Pharbitis Nil (PN) induces apoptosis and autophagy in lung cancer cells and autophagy inhibition enhances PN-induced apoptosis. J Ethnopharmacol 2017; 208:253-263. [PMID: 28729229 DOI: 10.1016/j.jep.2017.07.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 07/10/2017] [Accepted: 07/15/2017] [Indexed: 06/07/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Pharbitis Nil (PN) is used as a main component of the existing drug, DA-9701, which was developed to treat functional dyspepsia (FD) in Korea. PN extracts isolated from its seeds have been reported to have anticancer effects. AIM OF THE STUDY The purpose of this study was to investigate the underlying mechanism of the chemotherapeutic effects of PN in lung cancer cells. MATERIALS AND METHODS We performed MTT assays, colony formation assays, flow cytometry assays, Western blot analysis, reverse transcription-polymerase chain reaction (RT-PCR), immunofluorescence analysis, and cell counting assays to study the molecular mechanism of chemotherapeutic effects of PN in lung cancer cells. RESULTS Our results indicate that PN induced autophagy as well as apoptosis. PN inhibited cell proliferation and survival by inducing apoptosis in several lung cancer cell lines. PN-treated cells also exhibited induction of autophagy, as evidenced by increased protein expression levels and punctuate patterns of LC3 II. Moreover, activation of extracellular signal-regulated kinases 1 and 2 (ERK1/2), which plays an important role in autophagy activation, was shown to be related with PN-induced autophagy. Interestingly, pharmacological blockade of autophagy activation with wortmannin and inhibition of ERK1/2 phosphorylation by U0126 markedly enhanced PN-induced apoptosis and reduced cell viability, suggesting that autophagy induced by PN may have a cytoprotective effect by suppressing apoptosis. PN- induced apoptosis was regulated by signal transducer and activator of transcription 3 (STAT3) deactivation. Moreover, decrease of STAT3 activation in PN-treated cells was associated with reduced survivin expression, further demonstrating that PN-induced apoptosis was regulated by STAT3 deactivation. CONCLUSION We believe that PN, which is already proven to treat human patients with FD, might be a potential anticancer drug for human lung cancer. In addition, our data suggest that the combination of PN treatment with an autophagy inhibitor or traditional anticancer agents may be an effective anticancer therapy.
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Affiliation(s)
- Hyun Jin Jung
- Korea Mouse Phenotyping Center, College of Veterinary Medicine, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Ju-Hee Kang
- College of Pharmacy, Gachon University, 191, Hambangmoe-ro, Yeonsu-gu, Incheon 21936, Republic of Korea
| | - Seungho Choi
- College of Veterinary Medicine, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Youn Kyoung Son
- Biological and Genetic Resources Assessment Division, National Institute of Biological Resources, Incheon 22689, Republic of Korea
| | - Kang Ro Lee
- Natural Products Laboratory, School of Pharmacy, Sungkyunkwan University, Suwon 16419-16, Republic of Korea
| | - Je Kyung Seong
- Korea Mouse Phenotyping Center, College of Veterinary Medicine, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Sun Yeou Kim
- College of Pharmacy, Gachon University, 191, Hambangmoe-ro, Yeonsu-gu, Incheon 21936, Republic of Korea
| | - Seung Hyun Oh
- College of Pharmacy, Gachon University, 191, Hambangmoe-ro, Yeonsu-gu, Incheon 21936, Republic of Korea.
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Yamahara K, Nakagawa T, Ito J, Kinoshita K, Omori K, Yamamoto N. Netrin 1 mediates protective effects exerted by insulin-like growth factor 1 on cochlear hair cells. Neuropharmacology 2017; 119:26-39. [PMID: 28373074 DOI: 10.1016/j.neuropharm.2017.03.032] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Revised: 03/15/2017] [Accepted: 03/29/2017] [Indexed: 01/17/2023]
Abstract
Sensorineural hearing loss (SNHL) is mainly caused by the damage of cochlear hair cells (HCs). As HCs and supporting cells (SCs) do not proliferate in postnatal mammals, the loss of HCs and SCs is irreversible, emphasizing the importance of preserving their numbers to prevent SNHL. It is known that insulin-like growth factor 1 (IGF1) is instrumental in the treatment of SNHL. Our previous study indicates that IGF1 protects HCs against aminoglycoside by activating IGF1 receptor and its two major downstream pathways, PI3K/AKT and MEK/ERK, in SCs, which results in the upregulation of the expression of the Netrin1-encoding gene (Ntn1). However, the mechanisms underlying IGF1-induced protection of HCs via SC activation as well as the role of NTN1 in this process have not been elucidated. Here, we demonstrated that NTN1, similar to IGF1, promoted HC survival. NTN1 blocking antibody attenuated IGF1-induced HC protection from aminoglycoside, indicating that NTN1 is the effector molecule of IGF1 signaling during HC protection. In situ hybridization demonstrated that IGF1 potently induced Ntn1 expression in SCs. NTN1 receptors were abundantly expressed in the cochlea; among them, UNC5B mediated IGF1 protective effects on HCs, as NTN1 binding to UNC5B inhibited HC apoptosis. These results provide new insights into the mechanisms underlying IGF1 protection of cochlear HCs, suggesting a possibility of using NTN1 as a new treatment for SNHL.
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Affiliation(s)
- Kohei Yamahara
- Department of Otolaryngology, Head and Neck Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Kyoto 606-8507, Japan
| | - Takayuki Nakagawa
- Department of Otolaryngology, Head and Neck Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Kyoto 606-8507, Japan
| | - Juichi Ito
- Shiga Medical Center Research Institute, Moriyama, Shiga 524-8523, Japan
| | - Kazuo Kinoshita
- Shiga Medical Center Research Institute, Moriyama, Shiga 524-8523, Japan
| | - Koichi Omori
- Department of Otolaryngology, Head and Neck Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Kyoto 606-8507, Japan
| | - Norio Yamamoto
- Department of Otolaryngology, Head and Neck Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Kyoto 606-8507, Japan.
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Ko JC, Wang TJ, Chang PY, Syu JJ, Chen JC, Chen CY, Jian YT, Jian YJ, Zheng HY, Chen WC, Lin YW. Minocycline enhances mitomycin C-induced cytotoxicity through down-regulating ERK1/2-mediated Rad51 expression in human non-small cell lung cancer cells. Biochem Pharmacol 2015. [PMID: 26212550 DOI: 10.1016/j.bcp.2015.07.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Minocycline is a semisynthetic tetracycline derivative; it has anti-inflammatory and anti-cancer effects distinct from its antimicrobial function. However, the molecular mechanism of minocycline-induced cytotoxicity in non-small cell lung cancer (NSCLC) cells has not been identified. Rad51 plays a central role in homologous recombination and high levels of Rad51 expression are observed in chemo- or radioresistant carcinomas. Our previous studies have shown that the MKK1/2-ERK1/2 signal pathway maintains the expression of Rad51 in NSCLC cells. In this study, minocycline treatment inhibited cell viability and proliferation of two NSCLC cells, A549 and H1975. Treatment with minocycline decreased Rad51 mRNA and protein levels through MKK1/2-ERK1/2 inactivation. Furthermore, expression of constitutively active MKK1 (MKK1-CA) vectors significantly rescued the decreased Rad51 protein and mRNA levels in minocycline-treated NSCLC cells. However, combined treatment with MKK1/2 inhibitor U0126 and minocycline further decreased the Rad51 expression and cell viability of NSCLC cells. Knocking down Rad51 expression by transfection with small interfering RNA of Rad51 enhanced the cytotoxicity and cell growth inhibition of minocycline. Mitomycin C (MMC) is typically used as a first or second line regimen to treat NSCLC. Compared to a single agent alone, MMC combined with minocycline resulted in cytotoxicity and cell growth inhibition synergistically in NSCLC cells, accompanied with reduced activation of phospho-ERK1/2, and reduced Rad51 protein levels. Overexpression of MKK1-CA or Flag-tagged Rad51 could reverse the minocycline and MMC-induced synergistic cytotoxicity. These findings may have implications for the rational design of future drug regimens incorporating minocycline and MMC for the treatment of NSCLC.
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Affiliation(s)
- Jen-Chung Ko
- Department of Internal Medicine, National Taiwan University Hospital, Hsin-Chu Branch, Taiwan, Department of Nursing, Yuanpei University, Hsinchu, Taiwan
| | - Tai-Jing Wang
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan
| | - Po-Yuan Chang
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan
| | - Jhan-Jhang Syu
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan
| | - Jyh-Cheng Chen
- Department of Food Science, National Chiayi University, Chiayi, Taiwan
| | - Chien-Yu Chen
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan
| | - Yun-Ting Jian
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan
| | - Yi-Jun Jian
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan
| | - Hao-Yu Zheng
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan
| | - Wen-Ching Chen
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan
| | - Yun-Wei Lin
- Department of Biochemical Science and Technology, National Chiayi University, Chiayi, Taiwan.
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Talman V, Gateva G, Ahti M, Ekokoski E, Lappalainen P, Tuominen RK. Evidence for a role of MRCK in mediating HeLa cell elongation induced by the C1 domain ligand HMI-1a3. Eur J Pharm Sci 2014; 55:46-57. [PMID: 24486483 DOI: 10.1016/j.ejps.2014.01.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 01/03/2014] [Accepted: 01/12/2014] [Indexed: 12/13/2022]
Abstract
Diacylglycerol (DAG) is a central mediator of signaling pathways that regulate cell proliferation, survival and apoptosis. Therefore, C1 domain, the DAG binding site within protein kinase C (PKC) and other DAG effector proteins, is considered a potential cancer drug target. Derivatives of 5-(hydroxymethyl)isophthalic acid are a novel group of C1 domain ligands with antiproliferative and differentiation-inducing effects. Our previous work showed that these isophthalate derivatives exhibit antiproliferative and elongation-inducing effects in HeLa human cervical cancer cells. In this study we further characterized the effects of bis(3-trifluoromethylbenzyl) 5-(hydroxymethyl)isophthalate (HMI-1a3) on HeLa cell proliferation and morphology. HMI-1a3-induced cell elongation was accompanied with loss of focal adhesions and actin stress fibers, and exposure to HMI-1a3 induced a prominent relocation of cofilin-1 into the nucleus regardless of cell phenotype. The antiproliferative and morphological responses to HMI-1a3 were not modified by pharmacological inhibition or activation of PKC, or by RNAi knock-down of specific PKC isoforms, suggesting that the effects of HMI-1a3 were not mediated by PKC. Genome-wide gene expression microarray and gene set enrichment analysis suggested that, among others, HMI-1a3 induces changes in small GTPase-mediated signaling pathways. Our experiments revealed that the isophthalates bind also to the C1 domains of β2-chimaerin, protein kinase D (PKD) and myotonic dystrophy kinase-related Cdc42-binding kinase (MRCK), which are potential mediators of small GTPase signaling and cytoskeletal reorganization. Pharmacological inhibition of MRCK, but not that of PKD attenuated HMI-1a3-induced cell elongation, suggesting that MRCK participates in mediating the effects of HMI-1a3 on HeLa cell morphology.
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Affiliation(s)
- Virpi Talman
- Division of Pharmacology and Toxicology, Faculty of Pharmacy, University of Helsinki, FI-00014 Helsinki, Finland.
| | - Gergana Gateva
- Institute of Biotechnology, University of Helsinki, FI-00014 Helsinki, Finland
| | - Marja Ahti
- Division of Pharmacology and Toxicology, Faculty of Pharmacy, University of Helsinki, FI-00014 Helsinki, Finland
| | - Elina Ekokoski
- Division of Pharmacology and Toxicology, Faculty of Pharmacy, University of Helsinki, FI-00014 Helsinki, Finland
| | - Pekka Lappalainen
- Institute of Biotechnology, University of Helsinki, FI-00014 Helsinki, Finland
| | - Raimo K Tuominen
- Division of Pharmacology and Toxicology, Faculty of Pharmacy, University of Helsinki, FI-00014 Helsinki, Finland
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