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Cui Y, Wu J, Zhang D, Li D, Zhang J, Li W, Wang C, Yuan C, Liu Z. Changes in chemical components and hepatoprotective effect of red Panax notoginseng processed by aspartic acid impregnation treatment. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2024; 104:6085-6099. [PMID: 38445528 DOI: 10.1002/jsfa.13440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 02/28/2024] [Accepted: 03/06/2024] [Indexed: 03/07/2024]
Abstract
BACKGROUND Red Panax notoginseng (RPN) is one of the major processed products of P. notoginseng (PN), with more effective biological activities. However, the traditional processing method of RPN has some disadvantages, such as low conversion rate of ginsenosides and long processing time. RESULTS In this work, we developed a green, safe, and efficient approach for RPN processing by aspartic acid impregnation pretreatment. Our results showed that the optimized temperature, steaming time, and concentration of aspartic acid were 120 °C, 1 h, and 3% respectively. The original ginsenosides in PN treated by aspartic acid (Asp-PN) were completely converted to rare saponins at 120 °C within just 1 h. The concentration of the rare ginsenosides in Asp-PN was two times higher than that in untreated RPN. In addition, we examined the protective effect of RPN and Asp-PN on acetaminophen-induced liver injury in a mouse model. The results showed that Asp-PN has significantly more potent hepatoprotective action than the RPN. The hepatoprotection of Asp-PN in acetaminophen-induced hepatotoxicity may be due to its anti-oxidative stress, anti-apoptotic, and anti-inflammatory activities. CONCLUSION These results indicated that aspartic acid impregnation pretreatment may provide an effective method to shorten the steaming time, improve the conversion rate of ginsenosides, and enhance hepatoprotective activity of RPN. © 2024 Society of Chemical Industry.
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Affiliation(s)
- Ying Cui
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, China
| | - Jianfa Wu
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, China
| | - Danli Zhang
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, China
| | - Dan Li
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, China
| | - Jing Zhang
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, China
- Jilin Provincial International Joint Research Center for the Development and Utilization of Authentic Medicinal Materials, Changchun, China
| | - Wei Li
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, China
- Jilin Provincial International Joint Research Center for the Development and Utilization of Authentic Medicinal Materials, Changchun, China
| | - Chongzhi Wang
- Tang Center for Herbal Medicine Research and The Pritzker School of Medicine, University of Chicago, Chicago, IL, USA
| | - Chunsu Yuan
- Tang Center for Herbal Medicine Research and The Pritzker School of Medicine, University of Chicago, Chicago, IL, USA
| | - Zhi Liu
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun, China
- Jilin Provincial International Joint Research Center for the Development and Utilization of Authentic Medicinal Materials, Changchun, China
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Tan X, Cui J, Liu N, Wang X, Li H, Liu Y, Zhang W, Ma W, Lu D, Fan Y. Study on the immune-enhancing and inhabiting transmissible gastroenteritis virus effects of polysaccharides from Cimicifuga rhizoma. Microb Pathog 2024; 192:106719. [PMID: 38810768 DOI: 10.1016/j.micpath.2024.106719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 05/21/2024] [Accepted: 05/25/2024] [Indexed: 05/31/2024]
Abstract
Cimicifugae rhizoma is a traditional Chinese herbal medicine in China, and modern pharmacological research showed that it has obvious antiviral activity. Many polysaccharides have been proved to have immune enhancement and antiviral activity, but there are few studies on the biological activity of Cimicifuga rhizoma polysaccharide (CRP). The aim was to explore the character of CRP and its effects on improving immune activity and inhibiting transmissible gastroenteritis virus (TGEV). The monosaccharide composition, molecular weight, fourier transform infrared spectra and electron microscopy analysis of CRP was measured. The effect of CRP on immune activity in lymphocytes and RAW264.7 cells were studied by colorimetry, FITC-OVA fluorescent staining and ELISA. The effect of CRP on TGEV-infected PK-15 cells was determined using Real-time PCR, Hoechst fluorescence staining, trypan blue staining, acridine orange staining, Annexin V-FITC/PI fluorescent staining, DCFH-DA loading probe, and JC-1 staining. Network pharmacology was used to predict the targets of CRP in enhancing immunity and anti-TGEV, and molecular docking was used to further analyze the binding mode between CPR and core targets. The results showed that CRP was mainly composed of glucose and galactose, and its molecular weight was 64.28 kDa. The content of iNOS and NO in CRP group were significantly higher than the control group. CRP (125 and 62.5 μg/mL) could significantly enhance the phagocytic capacity of RAW264.7 cells, and imprive the content of IL-1β content compared with control group. 250 μg/mL of CRP possessed the significant inhibitory effect on TGEV, which could significantly reduce the apoptosis compared to TGVE group and inhibit the decrease in mitochondrial membrane potential compared to TGVE group. The mRNA expression of TGEV N gene in CRP groups was significantly lower than TGEV group. PPI showed that the core targets of immune-enhancing were AKT1, MMP9, HSP90AA1, etc., and the core targets of TGE were CASP3, MMP9, EGFR, etc. Molecular docking show that CRP has binding potential with target. These results indicated that CRP possessed the better immune enhancement effect and anti-TGEV activity.
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Affiliation(s)
- Xuewen Tan
- College of Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China; Institute of Traditional Chinese Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China
| | - Jing Cui
- College of Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China; Institute of Traditional Chinese Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China
| | - Nishang Liu
- College of Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China; Institute of Traditional Chinese Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China
| | - Xingchen Wang
- College of Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China; Institute of Traditional Chinese Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China
| | - Huicong Li
- College of Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China; Institute of Traditional Chinese Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China
| | - Yingqiu Liu
- College of Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China; Institute of Traditional Chinese Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China
| | - Weimin Zhang
- College of Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China; Institute of Traditional Chinese Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China
| | - Wuren Ma
- College of Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China; Institute of Traditional Chinese Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China
| | - Dezhang Lu
- College of Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China.
| | - Yunpeng Fan
- College of Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China; Institute of Traditional Chinese Veterinary Medicine, Northwest A&F University, 712100, Yangling, PR China.
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Xiang L, Cai X, Zhao X, Liu Y, Xiao Y, Jiang P, Yin L, Song D, Jiang X. Uncovering the mechanism of Qidan Dihuang Granule in the treatment of diabetic kidney disease combined network pharmacology, UHPLC-MS/MS with experimental validation. Heliyon 2023; 9:e21714. [PMID: 37954274 PMCID: PMC10638057 DOI: 10.1016/j.heliyon.2023.e21714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 09/01/2023] [Accepted: 10/26/2023] [Indexed: 11/14/2023] Open
Abstract
Background and aim Diabetic Kidney Disease (DKD) is a common microvascular complication of diabetes mellitus. Multi-center, randomized controlled trials have shown that Qidan Dihuang Granule (QDDHG) reduces the levels of albuminuria of DKD. However, the specific mechanisms of QDDHG on DKD are not clarified. Thus, this study utilized network pharmacology, UHPLC-MS/MS (Ultra-High Performance Liquid Chromatography - Mass Spectrometry) and animal experiments to reveal the mechanisms of QDDHG on DKD. Experimental procedure Screening and retrieving active ingredients and corresponding targets of QDDHG on DKD through the TCMSP, ETCM, Disgenet, GeneCards, Omim and DrugBank databases. The PPI were performed with BioGrid, STRING, OmniPath, InWeb-IM. AutoDock Vina molecular docking module to estimate the validation from the compounds and target proteins. Free energy to estimate the binding affinity for identified compounds and target proteins. The ingredients of QDDHG were analyzed utilizing UHPLC-MS/MS. In vivo experiment with db/db mice were used to verify the targets and pathway predicted by network pharmacology. Results and conclusion The results demonstrated that QDDHG has 18 active compounds and 13 target proteins of QDDHG exerted a crucial role in treatment of DKD. QDDHG affect the multiple biological processes included cellular response to lipid, response to oxidative stress, and various pathways, such as AGE-RAGE, PI3K-Akt, MAPK, TNF, EGFR, STAT3. The results of UHPLC-MS/MS showed that six ingredients predicted by network pharmacology were also verified in experiment. In vivo experiment verified the effects of QDDHG on protecting the renal function mainly through inhibited the expression of EGFR, STAT3 and pERK in the db/db mice.
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Affiliation(s)
- Lei Xiang
- Department of Nephrology Internal Medicine, The First Affiliated Hospital of Jinan University, 510630, Guangzhou, China
- Clinical Laboratory, Guangzhou Cadre Health Management Center, Guangzhou No.11 People's Hospital, Guangzhou, 510530, China
- Department of Nephrology Internal Medicine, University of Chinese Academy of Science-Shenzhen Hospital, 518107, Shenzhen, China
| | - Xiangsheng Cai
- Clinical Laboratory, Guangzhou Cadre Health Management Center, Guangzhou No.11 People's Hospital, Guangzhou, 510530, China
| | - Xiaoshan Zhao
- School of Traditional Chinese Medicine, Southern Medical University, 510515, Guangzhou, China
| | - Yuanling Liu
- Administrative Department, Guangdong Women and Children Hospital, 510010, Guangzhou, China
| | - Ya Xiao
- School of Traditional Chinese Medicine, Jinan University, 510632, Guangzhou, China
| | - Pingping Jiang
- Department of Traditional Chinese Medicine, The First Affiliated Hospital of Guangdong Pharmaceutical University, 510062, Guangzhou, China
| | - Lianghong Yin
- Department of Nephrology Internal Medicine, The First Affiliated Hospital of Jinan University, 510630, Guangzhou, China
| | - Dan Song
- Department of Nephrology Internal Medicine, University of Chinese Academy of Science-Shenzhen Hospital, 518107, Shenzhen, China
| | - Xuefeng Jiang
- School of Traditional Chinese Medicine, Southern Medical University, 510515, Guangzhou, China
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Wang SY, Sun XC, Lv XY, Li JN, Han B, Liu KL, Wang S, Sheng HG, Zhang C, Guo F, Cui YD. Network pharmacology-based approach uncovers the pharmacodynamic components and mechanism of Fructus Tribuli for improving endothelial dysfunction in hypertension. JOURNAL OF ETHNOPHARMACOLOGY 2023:116749. [PMID: 37295575 DOI: 10.1016/j.jep.2023.116749] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 05/10/2023] [Accepted: 06/06/2023] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Fructus Tribuli (FT), a traditional Chinese medicinal herbal, has been used for the clinical treatment of cardiovascular diseases for many years and affects vascular endothelial dysfunction (ED) in patients with hypertension. AIM OF THE STUDY This study aimed to demonstrate the pharmacodynamic basis and mechanisms of FT for the treatment of ED. MATERIALS AND METHODS The present study used ultra-high-performance liquid chromatography coupled with quadruple-time-of-flight mass spectrometry (UHPLC-Q-TOF/MS) to analyze and identify the chemical components of FT. The active components in blood were determined after the oral administration of FT by comparative analysis to blank plasma. Then, based on the active components in vivo, network pharmacology was performed to predict the potential targets of FT in treating ED. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses were also performed, and component-target-pathway networks were constructed. Interactions between the major active components and main targets were verified by molecular docking. Moreover, spontaneously hypertensive rats (SHRs) were divided into the normal, model, valsartan, low-dose FT, medium-dose FT, and high-dose FT experimental groups. In pharmacodynamic verification studies, treatment effects on blood pressure, serum markers (nitric oxide [NO], endothelin-1 [ET-1,], and angiotensin Ⅱ [Ang Ⅱ)]) of ED, and endothelial morphology of the thoracic aorta were evaluated and compared between groups. Finally, the PI3K/AKT/eNOS pathway was analyzed by quantitative real-time polymerase chain reaction (qRT-PCR) and Western blot of the thoracic aorta of rats in each group to detect the mRNA expression of PI3K, AKT, and eNOS and the protein expression of PI3K, AKT, p-AKT, eNOS, and p-eNOS. RESULTS A total of 51 chemical components were identified in FT, and 49 active components were identified in rat plasma. Thirteen major active components, 22 main targets, and the PI3K/AKT signaling pathway were screened by network pharmacology. The animal experiment results showed that FT reduced systolic blood pressure and ET-1 and Ang Ⅱ levels and increased NO levels in SHRs to varying degrees. The therapeutic effects were positively correlated with the oral dose of FT. Hematoxylin-eosin (HE) staining confirmed that FT could alleviate the pathological damage of the vascular endothelium. qRT-PCR and Western blot analysis confirmed that up-regulated expression of the PI3K/AKT/eNOS signaling pathway could improve ED. CONCLUSIONS In this study, the material basis of FT was comprehensively identified, and the protective effect on ED was confirmed. FT had a treatment effect on ED through multi-component, multi-target, and multi-pathways. It also played a role by up-regulating the PI3K/AKT/eNOS signaling pathway.
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Affiliation(s)
- Shu-Yue Wang
- School of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China; Binzhou Hospital of Traditional Chinese Medicine, Binzhou, 256600, China
| | - Xiao-Chen Sun
- School of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China; Zaozhuang Vocational College of Science & Technology, Zaozhuang, 277500, China
| | - Xi-Yu Lv
- School of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China
| | - Jing-Na Li
- School of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China
| | - Bing Han
- School of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China
| | - Kun-Lin Liu
- School of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China
| | - Shuai Wang
- School of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China
| | - Hua-Gang Sheng
- School of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China
| | - Chao Zhang
- School of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China.
| | - Fei Guo
- The Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, 250011, China.
| | - Yi-Dong Cui
- Department of Orthopedics, Qilu Hospital of Shandong University, Jinan, 250012, China.
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Lycium barbarum polysaccharide antagonizes cardiomyocyte apoptosis by inhibiting the upregulation of GRK2 induced by I/R injury, and salvage mitochondrial fission/fusion imbalance and AKT/eNOS signaling. Cell Signal 2022; 92:110252. [DOI: 10.1016/j.cellsig.2022.110252] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 12/20/2021] [Accepted: 01/14/2022] [Indexed: 12/24/2022]
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Lin Y, Ma HY, Wang Y, He J, Liu HJ. Identification of Potential Core Genes for the Rupture of Intracranial Aneurysms by a Bioinformatics Analysis. Front Genet 2022; 13:875007. [PMID: 35432454 PMCID: PMC9006073 DOI: 10.3389/fgene.2022.875007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Accepted: 03/14/2022] [Indexed: 11/13/2022] Open
Abstract
Background: Previous studies, using autopsy and angiography, have shown that 3.6–6% of the population have intracranial aneurysms, and the rupture of aneurysm can lead to brain dysfunction or even death in patients. Methods: To explore potential preventional target genes for the ruptured of aneurysm, we analyze three gene expression datasets (GSE13353, GSE15629 and GSE54083) derived from the GEO database. We confirm DEGs associated with the unrupture of aneurysms by R package. DAVID version provides functional classification and annotation analyses of associated genes, including GO and KEGG pathway. PPI of these DEGs is analyzed based on the string database and visualized by Cytoscape software. DEGs are verified by qRT-PCR using samples isolated from the patients. Results: 249 overlapping DEGs, including 96 up-regulated genes and 153 down-regulated genes are screened using the Venn diagram webtool. The GO term and KEGG pathways analysis results indicate that these DEGs are mainly enriched in protein phosphorylation, apoptotic process and inflammatory response in the BP term and focal adhesion, thyroid hormone signaling pathway, ErbB signaling pathway, cytokine-cytokine receptor interaction and some disease processes in the KEGG pathways. 6 candidates are confirmed by Cytoscape software and qRT-PCR, including APP, JUN, GSK3B, ErbB2, PPBP and THBS1. Conclusions: Our data and previous studies show that ErbB2 and THBS1 are crucial to prevent aneurysm rupture, while APP, JUN, GSK3B and PPBP performs the opposite role, and further experiments are needed to verify these findings.
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Gardin C, Ferroni L, Erdoğan YK, Zanotti F, De Francesco F, Trentini M, Brunello G, Ercan B, Zavan B. Nanostructured Modifications of Titanium Surfaces Improve Vascular Regenerative Properties of Exosomes Derived from Mesenchymal Stem Cells: Preliminary In Vitro Results. NANOMATERIALS 2021; 11:nano11123452. [PMID: 34947800 PMCID: PMC8707709 DOI: 10.3390/nano11123452] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 12/05/2021] [Accepted: 12/09/2021] [Indexed: 01/02/2023]
Abstract
(1) Background: Implantation of metal-based scaffolds is a common procedure for treating several diseases. However, the success of the long-term application is limited by an insufficient endothelialization of the material surface. Nanostructured modifications of metal scaffolds represent a promising approach to faster biomaterial osteointegration through increasing of endothelial commitment of the mesenchymal stem cells (MSC). (2) Methods: Three different nanotubular Ti surfaces (TNs manufactured by electrochemical anodization with diameters of 25, 80, or 140 nm) were seeded with human MSCs (hMSCs) and their exosomes were isolated and tested with human umbilical vein endothelial cells (HUVECs) to assess whether TNs can influence the secretory functions of hMSCs and whether these in turn affect endothelial and osteogenic cell activities in vitro. (3) Results: The hMSCs adhered on all TNs and significantly expressed angiogenic-related factors after 7 days of culture when compared to untreated Ti substrates. Nanomodifications of Ti surfaces significantly improved the release of hMSCs exosomes, having dimensions below 100 nm and expressing CD63 and CD81 surface markers. These hMSC-derived exosomes were efficiently internalized by HUVECs, promoting their migration and differentiation. In addition, they selectively released a panel of miRNAs directly or indirectly related to angiogenesis. (4) Conclusions: Preconditioning of hMSCs on TNs induced elevated exosomes secretion that stimulated in vitro endothelial and cell activity, which might improve in vivo angiogenesis, supporting faster scaffold integration.
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Affiliation(s)
- Chiara Gardin
- Maria Cecilia Hospital, GVM Care & Research, Cotignola, 48033 Ravenna, Italy; (C.G.); (L.F.)
| | - Letizia Ferroni
- Maria Cecilia Hospital, GVM Care & Research, Cotignola, 48033 Ravenna, Italy; (C.G.); (L.F.)
| | - Yaşar Kemal Erdoğan
- Biomedical Engineering Program, Middle East Technical University, Ankara 06800, Turkey; (Y.K.E.); (B.E.)
- Department of Biomedical Engineering, Isparta University of Applied Science, Isparta 32260, Turkey
| | - Federica Zanotti
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy; (F.Z.); (M.T.)
| | - Francesco De Francesco
- Department of Plastic and Reconstructive Surgery-Hand Surgery Unit, Azienda ‘Ospedali Riuniti’, 60126 Ancona, Italy;
| | - Martina Trentini
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy; (F.Z.); (M.T.)
| | - Giulia Brunello
- Department of Neurosciences, Dentistry Section, University of Padova, 35128 Padova, Italy;
- Department of Oral Surgery, University Clinic Düsseldorf, 40225 Dusseldorf, Germany
| | - Batur Ercan
- Biomedical Engineering Program, Middle East Technical University, Ankara 06800, Turkey; (Y.K.E.); (B.E.)
- Department of Metallurgical and Materials Engineering, Middle East Technical University, Ankara 06800, Turkey
- BIOMATEN, METU Center of Excellence in Biomaterials and Tissue Engineering, Ankara 06800, Turkey
| | - Barbara Zavan
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy; (F.Z.); (M.T.)
- Correspondence: ; Tel.: +39-0532455502
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Jiang HY, Bao YN, Lin FM, Jin Y. Triptolide regulates oxidative stress and inflammation leading to hepatotoxicity via inducing CYP2E1. Hum Exp Toxicol 2021; 40:S775-S787. [PMID: 34758665 DOI: 10.1177/09603271211056330] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Triptolide (TP), the main active compound extracted from medicine-tripterygium wilfordii Hook f. (TWHF). It has anti-tumor and immunomodulatory properties. Our study aimed to investigate the mechanisms of hepatotoxicity treated with TP in vivo and in vitro, as well as their relationship with the NF-κB (p65) signal pathway; and to assess TP-induced hepatotoxicity after CYP2E1 modulation by the known inhibitor, clomethiazole, and the known inducer, pyrazole. Mice were given TP to cause liver injury and IHHA-1 cells were given TP to cause hepatocyte injury. The enzyme activity and hepatotoxicity changed dramatically when the CYP2E1 inhibitor and inducer were added. In comparison to the control group, the enzyme inducer increased the activity of CYP2E1, whereas the enzyme inhibitor had the opposite effect. Our findings suggest that TP is an inducer of CYP2E1 via a time-dependent activation mechanism. In addition, TP can promote oxidative stress, inflammatory and involving the NF-κB (p65) signal pathway. Therefore, we used triptolide to stimulate C57 mice and IHHA-1 cells to determine whether TP can promote oxidative stress and inflammation by activating CYP2E1 in response to exacerbated liver damage and participate in NF-κB (p65) signaling pathway.
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Affiliation(s)
- Hai-Yan Jiang
- Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- The Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- Institute for Liver Diseases of Anhui Medical University, Hefei, China
| | - Yan-Ni Bao
- Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- The Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- Institute for Liver Diseases of Anhui Medical University, Hefei, China
| | - Feng-Mei Lin
- Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- The Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- Institute for Liver Diseases of Anhui Medical University, Hefei, China
| | - Yong Jin
- Key Laboratory of Anti-inflammatory and Immune Medicines, Ministry of Education, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- The Key Laboratory of Major Autoimmune Diseases, Anhui Institute of Innovative Drugs, School of Pharmacy, 12485Anhui Medical University, Hefei, China
- Institute for Liver Diseases of Anhui Medical University, Hefei, China
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Li MY, Li MX, Xu N, Li ZH, Zhang YM, Gan YX, Luo HJ, Zhou CL, Liu YH, Su ZR, Huang XQ, Zheng XB. Effects of Huangqin Decoction on ulcerative colitis by targeting estrogen receptor alpha and ameliorating endothelial dysfunction based on system pharmacology. JOURNAL OF ETHNOPHARMACOLOGY 2021; 271:113886. [PMID: 33524513 DOI: 10.1016/j.jep.2021.113886] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 01/26/2021] [Accepted: 01/27/2021] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Huangqin Decoction (HQD), a traditional Chinese medicinal (TCM) formula chronicled in Shang Han Lun, has been used to treat gastrointestinal diseases for nearly 1800 years. OBJECTIVE To investigate the effects and underlying mechanisms of HQD on ulcerative colitis (UC). METHODS The bioactive compounds in HQD were obtained from the traditional Chinese medicine systems pharmacology database. Then, the HQD and UC-related targets were analyzed by establishing HQD-Compounds-Targets (H-C-T) and protein-protein interaction (PPI) networks. Enrichment analysis was used for further study. The candidate targets for the effects of HQD on UC were validated using a dextran sulfate sodium-induced UC mouse experiment. RESULTS The results showed that 51 key targets were gained by matching 284 HQD-related targets and 837 UC-related targets. Combined with H-C-T and PPI network analyses, the key targets were divided into endothelial growth, inflammation and signal transcription-related targets. Further experimental validation showed that HQD targeted estrogen receptor alpha (ESR1) and endothelial growth factor receptors to relieve endothelial dysfunction, thereby improving intestinal barrier function. The expression of inflammatory cytokines and signal transducers was suppressed by HQD treatment and inflammation was inhibited. CONCLUSIONS HQD may acts on UC via the regulation of targets and pathways related to improving the intestinal mucosal barrier and ameliorating endothelial dysfunction. Additionally, ERS1 may be a new target to explore the mechanisms of UC.
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Affiliation(s)
- Min-Yao Li
- School of Pharmaceutical Sciences (Mathematical Engineering Academy of Chinese Medicine), Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Mu-Xia Li
- School of Pharmaceutical Sciences (Mathematical Engineering Academy of Chinese Medicine), Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Nan Xu
- School of Pharmaceutical Sciences (Mathematical Engineering Academy of Chinese Medicine), Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Ze-Hao Li
- School of Pharmaceutical Sciences (Mathematical Engineering Academy of Chinese Medicine), Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Yao-Min Zhang
- School of Pharmaceutical Sciences (Mathematical Engineering Academy of Chinese Medicine), Guangzhou University of Chinese Medicine, Guangzhou, China; Dongguan Songshan Lake Yidao TCM Clinic, Dongguan, China
| | - Yu-Xuan Gan
- School of Pharmaceutical Sciences (Mathematical Engineering Academy of Chinese Medicine), Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Hui-Juan Luo
- School of Pharmaceutical Sciences (Mathematical Engineering Academy of Chinese Medicine), Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Chang-Lin Zhou
- Graduate School, Guangdong Medical University, Dongguan, China
| | - Yu-Hong Liu
- School of Pharmaceutical Sciences (Mathematical Engineering Academy of Chinese Medicine), Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Zi-Ren Su
- School of Pharmaceutical Sciences (Mathematical Engineering Academy of Chinese Medicine), Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Xiao-Qi Huang
- School of Pharmaceutical Sciences (Mathematical Engineering Academy of Chinese Medicine), Guangzhou University of Chinese Medicine, Guangzhou, China.
| | - Xue-Bao Zheng
- School of Pharmaceutical Sciences (Mathematical Engineering Academy of Chinese Medicine), Guangzhou University of Chinese Medicine, Guangzhou, China; Dongguan Songshan Lake Yidao TCM Clinic, Dongguan, China.
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Luo Y, Ma H, Niu S, Li X, Nie L, Li G. Effects of norepinephrine on colonic tight junction protein expression during heat stress. Exp Ther Med 2021; 21:421. [PMID: 33747161 PMCID: PMC7967871 DOI: 10.3892/etm.2021.9865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 01/19/2021] [Indexed: 12/18/2022] Open
Abstract
Stress induced by changes in the internal or external environment in humans and animals leads to intestinal epithelial damage, in a manner that is associated with impaired intestinal barrier function. However, the role of the stress hormone norepinephrine (NE) in impairments in barrier function remains poorly understood. In the present study, a rat heat-exposed model was used to observe changes in the tight junction proteins Occludin and zonula occludens-1 (ZO-1), in addition to those in protease-activated receptor 2 (PAR-2) and transient receptor potential ankyrin 1 channel (TRPA1) in colon. The levels of plasma NE were detected using an ELISA kit. Different concentrations of NE were used to culture the human colon cell line Caco-2 for 6 and 24 h to investigate the cell viability using Cell Counting Kit-8 assay, whilst the expression levels of Occludin, ZO-1, PAR-2 and TRPA1 were examined using western blotting and immunofluorescence in Caco-2 cells and immunohistrochemistry in rat colon tissues. Although there was no clear histological damage to the rat colonic mucosa, there were decreased expression levels of tight junction proteins Occludin and ZO-1 after heat exposure. In addition, PAR-2 expression was increased by heat exposure. It was found that TRPA1 expression was concentrated to the luminal surface of the colon in the heat exposed group compared with that in the control group. After the administration of increasing concentrations of NE for 6 h, treatment did not affect cell viability. Furthermore, after application of NE for 24 h, cell viability gradually increased as the NE concentration was elevated from 10 to 100 µM. However, no significant increase in viability was observed when the cells were treated with 120 and 160 µM NE. Occludin expression was decreased when 10 µM NE was applied for 6 or 24 h. By contrast, 60 µM NE significantly downregulated Occludin expression in the 6 h group, but caused an insignificant decrease in the 24 h group. It was found that ZO-1 expression was upregulated after treatment with 10 µM NE for 6 h, whilst downregulation was observed after treatment with 10 µM NE for 24 h. PAR-2 protein expression was increased after application of NE for both 6 and 24 h, but not after treatment with 60 µM NE. In addition, TRPA1 expression was not affected by the treatment of NE, but increased positive staining was observed on the luminal side of the mucosa, which appeared to be concentrated in the cells of the luminal side in the rat colon after heat exposure. Collectively, the present results suggested that expression of tight junction proteins Occludin and ZO-1, in addition to that of PAR-2, can be regulated by NE, which may contribute to impairments in barrier function observed during heat stress.
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Affiliation(s)
- Yan Luo
- Key Laboratory of Fertility Preservation and Maintenance of Ministry of Education, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R China.,Institute of Basic Medical Sciences, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R China
| | - Huiming Ma
- Key Laboratory of Fertility Preservation and Maintenance of Ministry of Education, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R China
| | - Shibo Niu
- Institute of Basic Medical Sciences, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R China
| | - Xu Li
- Institute of Basic Medical Sciences, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R China.,People's Hospital of Ningxia Hui Autonomous Region, Yinchuan, Ningxia 750021, P.R China
| | - Lihong Nie
- Institute of Basic Medical Sciences, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R China
| | - Guanghua Li
- Institute of Basic Medical Sciences, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R China
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11
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Gu H, Li J, Zhang R. Melatonin upregulates DNA-PKcs to suppress apoptosis of human umbilical vein endothelial cells via inhibiting miR-101 under H 2O 2-induced oxidative stress. Mol Cell Biochem 2020; 476:1283-1292. [PMID: 33226571 DOI: 10.1007/s11010-020-03991-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Accepted: 11/16/2020] [Indexed: 02/07/2023]
Abstract
Melatonin has been implicated in inhibiting oxidative stress-induced apoptosis of endothelial cells. However, the underlying mechanism remains poorly understood. In this study, we examined the effect of melatonin on apoptosis of human umbilical vein endothelial cells (HUVECs) induced by H2O2 and explored the underlying mechanisms. Our results demonstrated that DNA-dependent protein kinase catalytic subunit (DNA-PKcs) upregulation contributed to the protective role of melatonin in HUVECs under oxidative stress with H2O2. Further study showed that melatonin treatment led to a decreased level of miRNA-101, which could be responsible for DNA-PKcs upregulation and DNA-PKcs-mediated apoptosis inhibition in HUVECs under oxidative stress with H2O2. Our results also showed that melatonin increased the activity of PI3K/AKT and DNA-PKcs knockdown in melatonin-treated HUVECs that lead to inactivation of PI3K/AKT signaling under oxidative stress with H2O2. Furthermore, blockade of PI3K/AKT signal with LY294002 significantly reduced melatonin-induced apoptosis inhibition in H2O2-treated HUVECs. Taken together, our findings identify a miR-101/DNA-PKcs/PI3K/AKT signaling pathway in melatonin-induced endothelial cell apoptosis inhibition under oxidative stress with H2O2.
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Affiliation(s)
- Hao Gu
- Department of Pediatrics, The Affiliated Huaian No.1 People's Hospital of Nanjing Medical University, No.1 the Yellow River West Road, Huaiyin District, Huai'an, Jiangsu, 223300, People's Republic of China
| | - Jian Li
- Department of Anesthesiology, The Affiliated Huaian No.1 People's Hospital of Nanjing Medical University, Huai'an, Jiangsu, 223300, People's Republic of China
| | - Rongrong Zhang
- Department of Pediatrics, The Affiliated Huaian No.1 People's Hospital of Nanjing Medical University, No.1 the Yellow River West Road, Huaiyin District, Huai'an, Jiangsu, 223300, People's Republic of China.
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12
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Li W, Wang JQ, Zhou YD, Hou JG, Liu Y, Wang YP, Gong XJ, Lin XH, Jiang S, Wang Z. Rare Ginsenoside 20(R)-Rg3 Inhibits D-Galactose-Induced Liver and Kidney Injury by Regulating Oxidative Stress-Induced Apoptosis. THE AMERICAN JOURNAL OF CHINESE MEDICINE 2020; 48:1141-1157. [PMID: 32668974 DOI: 10.1142/s0192415x20500561] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Oxidative stress is considered as a major factor in aging and exacerbates aging process through a variety of molecular mechanisms. D-galactose, a normal reducing sugar with high dose can cause the accumulation of reactive oxygen species (ROS) or stimulate free radical production indirectly by the formation of advanced glycation end products in tissues, finally resulting in oxidative stress. 20(R)-ginsenoside Rg3 (20(R)-Rg3), a major and representative component isolated from red ginseng (Panax ginseng C.A Meyer), has been shown to observably have an anti-oxidative effect. We thereby investigated the beneficial effects of 20(R)-Rg3 on D-galactose-induced oxidative stress injury and its underlying mechanisms. Our results showed that continuous injection of D-galactose with 800[Formula: see text]mg/kg/day for 8 weeks increased the levels of alanine aminotransferase (ALT) and blood urea nitrogen (BUN). However, such increases were attenuated by the treatment of 20(R)-Rg3 for 4 weeks. Meanwhile, 20(R)-Rg3 markedly inhibited D-galactose-caused oxidative stress in liver and kidney. The anti-oxidants, including catalase (CAT) and superoxide dismutase (SOD), were elevated in the mice from 20(R)-Rg3-treated group compared with that from D-galactose group. In contrast, a significant decrease in levels of cytochrome P450 E1 (CYP2E1) and the lipid peroxidation product malondialdehyde (MDA) and 4-hydroxynonenal (4-HNE) were observed in the 20(R)-Rg3-treated group. These effects were associated with a significant increase of AGEs. More importantly, 20(R)-Rg3 effectively attenuated D-galactose induced apoptosis in liver and kidney via restoring the upstream PI3K/AKT signaling pathway. Taken together, our study suggests that 20(R)-Rg3 may be a novel and promising anti-oxidative therapeutic agent to prevent aging-related injuries in liver and kidney.
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Affiliation(s)
- Wei Li
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun 130118, P. R. China.,National & Local Joint Engineering, Research Center for Ginseng Breeding and Development, Changchun 130118, P. R. China
| | - Jian-Qiang Wang
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun 130118, P. R. China
| | - Yan-Dan Zhou
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun 130118, P. R. China
| | - Jin-Gang Hou
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun 130118, P. R. China.,Intelligent Synthetic Biology Center, Daejeon 34141, Republic of Korea
| | - Ying Liu
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun 130118, P. R. China
| | - Ying-Ping Wang
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun 130118, P. R. China.,National & Local Joint Engineering, Research Center for Ginseng Breeding and Development, Changchun 130118, P. R. China
| | - Xiao-Jie Gong
- College of Medicine, Dalian University, Dalian 116622, P. R. China
| | - Xiang-Hui Lin
- Liaoning Xifeng Pharmaceutical, Group Co., Ltd., Huanren 117200, P. R. China
| | - Shuang Jiang
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun 130118, P. R. China.,National & Local Joint Engineering, Research Center for Ginseng Breeding and Development, Changchun 130118, P. R. China
| | - Zi Wang
- College of Chinese Medicinal Materials, Jilin Agricultural University, Changchun 130118, P. R. China.,National & Local Joint Engineering, Research Center for Ginseng Breeding and Development, Changchun 130118, P. R. China
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13
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Yan B, Zhang X, Wang J, Jia S, Zhou Y, Tian J, Wang H, Tang Y. Inhibitory effect of Lycium barbarum polysaccharide on sperm damage during cryopreservation. Exp Ther Med 2020; 20:3051-3063. [PMID: 32855672 PMCID: PMC7444372 DOI: 10.3892/etm.2020.9060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 05/29/2020] [Indexed: 12/16/2022] Open
Abstract
With the development of cryopreservation technology, marked progress has been made regarding sperm cryopreservation. However, as conventional cryopreservation agents are not effective at freezing weak sperm, improved cryopreservation agents are in demand. In the present study, the addition of Lycium barbarum polysaccharides to glycerol-egg-yolk-citrate sperm cryopreservation agent was determined to improve sperm forward speed, reduce the DNA fragmentation index and improve the mitochondrial membrane potential. Furthermore, during the freezing and thawing of sperm, the improved cryopreservative increased the content of Bcl-2 while reducing the content of Bax, cytochrome C and caspase-3. These results indicated that polysaccharides added as a protective agent preserved the normal function of sperm mitochondria. Transmission electron microscopy also confirmed the protective effect of the polysaccharides on the structure of mitochondria. It was also indicated that improved cryopreservative lowered the levels of reactive oxygen species (ROS) during the freeze-thawing process. Therefore, it is hypothesized that improved cryopreservative agents may be beneficial for maintaining the structure and function of the mitochondria of weak sperm when cryopreserved, which may be facilitated via reducing the production of ROS in the freezing-thawing process, thus avoiding activation of the apoptotic pathway in sperm mitochondria and protecting mitochondrial structure and sperm function.
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Affiliation(s)
- Bei Yan
- Ningxia Human Sperm Bank, General Hospital of Ningxia Medical University, Yinchuan, Ningxia 750001, P.R. China
| | - Xinzong Zhang
- National Health Committee Key Laboratory of Male Reproduction and Genetics, Family Planning Research Institute of Guangdong Province, Guangzhou, Guangdong 510600, P.R. China
| | - Juan Wang
- Department of Pathology, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R. China
| | - Shaotong Jia
- Reproductive Center, General Hospital of Ningxia Medical University, Yinchuan, Ningxia 750001, P.R. China
| | - Yue Zhou
- Ningxia Human Sperm Bank, General Hospital of Ningxia Medical University, Yinchuan, Ningxia 750001, P.R. China
| | - Jia Tian
- Ningxia Human Sperm Bank, General Hospital of Ningxia Medical University, Yinchuan, Ningxia 750001, P.R. China
| | - Hongyan Wang
- Ningxia Human Sperm Bank, General Hospital of Ningxia Medical University, Yinchuan, Ningxia 750001, P.R. China
| | - Yunge Tang
- National Health Committee Key Laboratory of Male Reproduction and Genetics, Family Planning Research Institute of Guangdong Province, Guangzhou, Guangdong 510600, P.R. China
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14
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Zhao N, Mu L, Chang X, Zhu L, Geng Y, Li G. Effects of varying intensities of heat stress on neuropeptide Y and proopiomelanocortin mRNA expression in rats. Biomed Rep 2020; 13:39. [PMID: 32934812 DOI: 10.3892/br.2020.1346] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2013] [Accepted: 07/20/2020] [Indexed: 12/13/2022] Open
Abstract
The aim of the present study was to investigate the effects of varying intensities of heat stress on the mRNA expression levels of neuropeptide Y (NPY), proopiomelanocortin (POMC) and stress hormones in rats. To establish a rat model of heat stress, the temperature and time were adjusted in a specialized heating chamber. Sprague-Dawley (SD) rats were randomly divided into four groups; control (CN; temperature, 24±1˚C); moderate strength 6 h (MS6; temperature, 32±1˚C time, 6 h), moderate strength 24 h (MS24; temperature, 32±1˚C; time, 24 h) and high strength 6 h (HS6; temperature, 38±1˚C; time, 6 h) groups. SD rats were exposed to heat for 14 consecutive days. The levels of heat stress-related factors, including corticotropin-releasing hormone (CRH), cortisol (COR), epinephrine (EPI) and heat shock protein 70 (HSP70), were measured in the rat blood using ELISA. In addition, the weight of the spleen, thymus, hypophysis and hypothalamus were determined. The mRNA expressions levels of NPY and POMC were detected using quantitative PCR. The results showed that the CRH, COR and HSP70 levels were increased in the three heat stress groups compared with the CN group. Notably, the levels of CRH, EPI and HSP70 were increased in the HS6 group compared with the CN and MS6 groups (P<0.05). Furthermore, the weights of the hypophysis and hypothalamus in the HS6 group were significantly lower compared with the CN group (P<0.05). In addition, NPY and POMC expression levels were downregulated in the MS24 group compared with the CN group. The mRNA expression levels of NPY and POMC were altered in response to different intensities of heat stress. Therefore, their levels were downregulated and upregulated following long-time and moderate-time heat exposure, respectively. The results of the present study suggested that the reduced mRNA expression levels of NPY may be partially responsible for the heat-induced injuries in rats following long-time heat exposure.
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Affiliation(s)
- Nan Zhao
- School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R. China.,Institute of Translational Medicine, First Affiliated Hospital of Jinzhou Medical University, Jinzhou, Liaoning 121000, P.R. China
| | - Le Mu
- School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R. China
| | - Xiaoyu Chang
- School of Public Health and Management, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R. China
| | - Lingqing Zhu
- School of Public Health and Management, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R. China
| | - Yao Geng
- School of Nursing, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R. China
| | - Guanghua Li
- School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R. China.,School of Public Health and Management, Ningxia Medical University, Yinchuan, Ningxia 750004, P.R. China
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