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Yan T, Nian T, Wu B, Xiao F, He B, Bi K, Jia Y. Okra polysaccharides can reverse the metabolic disorder induced by high-fat diet and cognitive function injury in Aβ 1-42 mice. Exp Gerontol 2019; 130:110802. [PMID: 31794852 DOI: 10.1016/j.exger.2019.110802] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 11/12/2019] [Accepted: 11/28/2019] [Indexed: 01/04/2023]
Abstract
Epidemiological studies showed that a high-fat diet threatened human health seriously. It can induce various diseases, such as obesity, metabolic disturbance and cognitive dysfunction which also related to insulin signaling. In the present study, Aβ1-42 induced AD model mice and normal mice were given a standard diet and high-fat diet, respectively. Meanwhile, Okra polysaccharides were used to treat AD mice to explore the possible mechanism between Alzheimer's disease and insulin signals. Weight and blood glucose of mice were measured weekly. Through the Morris water maze and the novel object recognition test, the Okra polysaccharides could improve the cognitive impairment of the AD mice. In addition, we also performed the serum chemistry analysis of mice, studied the histopathological changes in the hippocampal CA1 region by HE staining and detected the expressions of AKT, PI3K, ERK1/2, and GSK3β in the hippocampus by western blot. These results suggested that a high-fat diet can aggravate the metabolic disorder in AD mice and Okra polysaccharides can significantly reverse the metabolic disorder induced by high-fat diet and cognitive function injury in AD mice.
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Affiliation(s)
- Tingxu Yan
- School of Functional Food and Wine, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang 110016, China
| | - Tingting Nian
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang 110016, China
| | - Bo Wu
- School of Functional Food and Wine, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang 110016, China
| | - Feng Xiao
- School of Functional Food and Wine, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang 110016, China
| | - Bosai He
- School of Functional Food and Wine, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang 110016, China
| | - Kaishun Bi
- School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang 110016, China
| | - Ying Jia
- School of Functional Food and Wine, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang 110016, China.
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Tuya N, Wang Y, Tong L, Gao W, Yu R, Xue L. Trichosanthin enhances the antitumor effect of gemcitabine in non-small cell lung cancer via inhibition of the PI3K/AKT pathway. Exp Ther Med 2017; 14:5767-5772. [PMID: 29285119 PMCID: PMC5740788 DOI: 10.3892/etm.2017.5286] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 07/14/2017] [Indexed: 12/30/2022] Open
Abstract
Gemcitabine (GEMZ) is the first-line therapy used against non-small cell lung cancer (NSCLC), and studies have focused on investigating the potential effects of agents combined with GEMZ to enhance the anticancer efficacy in NSCLC. Previous studies have reported that trichosanthin (TCS) has various physiological and pharmacological effects, including anti-human influenza virus enzymes, inhibition of protein synthesis and antitumor activity. The purpose of the present study was to investigate if TCS enhanced the antitumor effects of GEMZ in NSCLC. MTT assay demonstrated that TCS significantly enhanced the cytotoxic effect of GEMZ (P>0.05). Furthermore, a propidium iodide/Αnnexin V staining assay revealed that TCS exerted its pharmacological effect by increasing the apoptotic population. In addition, western blot analysis demonstrated that the combination treatment of TCS with GEMZ further decreased the expression level of phosphoinositide 3-kinase (PI3K) and AKT via regulating the expression of insulin growth factor. The results of the present study demonstrated that TCS enhanced the cytotoxic and apoptotic effects of GEMZ in A549 cells via regulating the PI3K/AKT pathway. In conclusion, these observations may provide a potential rational basis for a combination strategy for chemotherapy treatment of NSCLC.
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Affiliation(s)
- Naren Tuya
- Department of Biology, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China.,Department of Radiation Oncology, General Hospital of Beijing Military Region, Beijing 100700, P.R. China.,Department of Chemotherapy Oncology, Inner Mongolia People's Hospital, Hohhot, Inner Mongolia 010020, P.R. China
| | - Yadi Wang
- Department of Biology, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China.,Department of Radiation Oncology, General Hospital of Beijing Military Region, Beijing 100700, P.R. China
| | - Lanmei Tong
- Department of Chemotherapy Oncology, Inner Mongolia People's Hospital, Hohhot, Inner Mongolia 010020, P.R. China
| | - Weishi Gao
- Department of Chemotherapy Oncology, Inner Mongolia People's Hospital, Hohhot, Inner Mongolia 010020, P.R. China
| | - Rong Yu
- Department of Radiation Oncology, Inner Mongolia Cancer Hospital, Hohhot, Inner Mongolia 010020, P.R. China
| | - Liying Xue
- Department of Chemotherapy Oncology, Inner Mongolia People's Hospital, Hohhot, Inner Mongolia 010020, P.R. China
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Ramalingam M, Cheng MH, Kim SJ. Insulin suppresses MPP+-induced neurotoxicity by targeting integrins and syndecans in C6 astrocytes. J Recept Signal Transduct Res 2017; 37:550-559. [DOI: 10.1080/10799893.2017.1369119] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Mahesh Ramalingam
- Department of Pharmacology and Toxicology, Metabolic Diseases Research Laboratory, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Mi Hyun Cheng
- Department of Pharmacology and Toxicology, Metabolic Diseases Research Laboratory, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Sung-Jin Kim
- Department of Pharmacology and Toxicology, Metabolic Diseases Research Laboratory, School of Dentistry, Kyung Hee University, Seoul, South Korea
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Ramalingam M, Kwon YD, Kim SJ. Insulin as a Potent Stimulator of Akt, ERK and Inhibin-βE Signaling in Osteoblast-Like UMR-106 Cells. Biomol Ther (Seoul) 2016; 24:589-594. [PMID: 27302964 PMCID: PMC5098537 DOI: 10.4062/biomolther.2016.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Revised: 03/23/2016] [Accepted: 03/29/2016] [Indexed: 12/31/2022] Open
Abstract
Insulin is a peptide hormone of the endocrine pancreas and exerts a wide variety of physiological actions in insulin sensitive tissues, such as regulation of glucose homeostasis, cell growth, differentiation, learning and memory. However, the role of insulin in osteoblast cells remains to be fully characterized. In this study, we demonstrated that the insulin (100 nM) has the ability to stimulate the phosphorylation of protein kinase B (Akt/PKB) and extracellular signal-regulated kinase (ERK) and the levels of inhibin-βE in the osteoblast-like UMR-106 cells. This insulin-stimulated activities were abolished by the PI3K and MEK1 inhibitors LY294002 and PD98059, respectively. This is the first report proving that insulin is a potential candidate that enables the actions of inhibin-βE subunit of the TGF-β family. The current investigation provides a foundation for the realization of insulin as a potential stimulator in survival signaling pathways in osteoblast-like UMR-106 cells.
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Affiliation(s)
- Mahesh Ramalingam
- Department of Pharmacology and Toxicology, Metabolic Diseases Research Laboratory, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Yong-Dae Kwon
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Sung-Jin Kim
- Department of Pharmacology and Toxicology, Metabolic Diseases Research Laboratory, Kyung Hee University, Seoul 02447, Republic of Korea
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Ramalingam M, Kim SJ. Insulin on activation of autophagy with integrins and syndecans against MPP +-induced α-synuclein neurotoxicity. Neurosci Lett 2016; 633:94-100. [PMID: 27646116 DOI: 10.1016/j.neulet.2016.09.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Revised: 07/18/2016] [Accepted: 09/15/2016] [Indexed: 01/14/2023]
Abstract
Parkinson's disease (PD) is the second most common neurodegenerative disease in the elderly caused by dopaminergic neuronal cell death. Human neuroblastoma SH-SY5Y cells differentiated by retinoic acid have been used to study the in vitro PD model induced by 1-methyl-4-phenyl pyridinium (MPP+). In this study, pretreatment of insulin inhibited MPP+-induced cell membrane damages, which also inhibited the Cox-2 and α-synuclein levels. In addition, MPP+ and/or insulin enhanced the autophagy LC3. Furthermore, MPP+-induced neurotoxicity diminished the integrins β3, αV and induced the syndecan-1 and -3. Insulin pretreatment enhanced the phosphorylation of integrin-linked kinase and further induced the integrin and syndecan molecules. These findings suggest that insulin prevents MPP+-induced α-synuclein apoptosis through the activation of integrin and syndecan pathways in SH-SY5Y+RA cells.
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Affiliation(s)
- Mahesh Ramalingam
- Department of Pharmacology and Toxicology, Metabolic Diseases Research Laboratory, School of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Sung-Jin Kim
- Department of Pharmacology and Toxicology, Metabolic Diseases Research Laboratory, School of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea.
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Song H, Liang W, Xu S, Li Z, Chen Z, Cui W, Zhou J, Wang Q, Liu F, Fan W. A novel role for integrin-linked kinase in periodic mechanical stress-mediated ERK1/2 mitogenic signaling in rat chondrocytes. Cell Biol Int 2016; 40:832-9. [PMID: 27154044 DOI: 10.1002/cbin.10622] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Accepted: 05/03/2016] [Indexed: 12/14/2022]
Abstract
In recent years, a variety of studies have been performed to investigate the cellular responses of periodic mechanical stress on chondrocytes. Integrin β1-mediated ERK1/2 activation was proven to be indispensable in periodic mechanical stress-induced chondrocyte proliferation and matrix synthesis. However, other signal proteins responsible for the mitogenesis of chondrocytes under periodic mechanical stress remain incompletely understood. In the current investigation, we probed the roles of integrin-linked kinase (ILK) signaling in periodic mechanical stress-induced chondrocyte proliferation and matrix synthesis. We found that upon periodic mechanical stress induction, ILK activity increased significantly. Depletion of ILK with targeted shRNA strongly inhibited periodic mechanical stress-induced chondrocyte proliferation and matrix synthesis. In addition, pretreatment with a blocking antibody against integrin β1 resulted in a remarkable decrease in ILK activity in cells exposed to periodic mechanical stress. Furthermore, inhibition of ILK with its target shRNA significantly suppressed ERK1/2 activation in relation to periodic mechanical stress. Based on the above results, we identified ILK as a crucial regulator involved in the integrin β1-ERK1/2 signal cascade responsible for periodic mechanical stress-induced chondrocyte proliferation and matrix synthesis.
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Affiliation(s)
- Huanghe Song
- Department of Orthopedics, The First Affiliated Hospital of Nanjing Medical University, 300 Guang Zhou Road, Nanjing, 210029, China
| | - Wenwei Liang
- Department of Orthopedics, The First Affiliated Hospital of Nanjing Medical University, 300 Guang Zhou Road, Nanjing, 210029, China
| | - Shun Xu
- Department of Orthopedics, The First Affiliated Hospital of Nanjing Medical University, 300 Guang Zhou Road, Nanjing, 210029, China
| | - Zeng Li
- Department of Orthopedics, The First Affiliated Hospital of Nanjing Medical University, 300 Guang Zhou Road, Nanjing, 210029, China
| | - Zhefeng Chen
- Department of Orthopedics, The First Affiliated Hospital of Nanjing Medical University, 300 Guang Zhou Road, Nanjing, 210029, China
| | - Weiding Cui
- Department of Orthopedics, The First Affiliated Hospital of Nanjing Medical University, 300 Guang Zhou Road, Nanjing, 210029, China
| | - Jinchun Zhou
- Department of Orthopedics, The First Affiliated Hospital of Nanjing Medical University, 300 Guang Zhou Road, Nanjing, 210029, China
| | - Qing Wang
- Department of Orthopedics, The First Affiliated Hospital of Nanjing Medical University, 300 Guang Zhou Road, Nanjing, 210029, China
| | - Feng Liu
- Department of Orthopedics, The First Affiliated Hospital of Nanjing Medical University, 300 Guang Zhou Road, Nanjing, 210029, China
| | - Weimin Fan
- Department of Orthopedics, The First Affiliated Hospital of Nanjing Medical University, 300 Guang Zhou Road, Nanjing, 210029, China
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