51
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Peng J, Yang Q, Li AF, Li RQ, Wang Z, Liu LS, Ren Z, Zheng XL, Tang XQ, Li GH, Tang ZH, Jiang ZS, Wei DH. Tet methylcytosine dioxygenase 2 inhibits atherosclerosis via upregulation of autophagy in ApoE-/- mice. Oncotarget 2018; 7:76423-76436. [PMID: 27821816 PMCID: PMC5363520 DOI: 10.18632/oncotarget.13121] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 10/21/2016] [Indexed: 12/23/2022] Open
Abstract
Tet methylcytosine dioxygenase 2 (TET2) mediates the conversion of 5-methylcytosine (5mC) to 5-hydroxymethylcytosine (5hmC). The loss of TET2 is associated with advanced atherosclerotic lesions. Our previous study showed that TET2 improves endothelial cell function by enhancing endothelial cell autophagy. Accordingly, this study determined the role of TET2 in atherosclerosis and potential mechanisms. In ApoE-/- mice fed high-fat diet, TET2 overexpression markedly decreased atherosclerotic lesions with uniformly increased level of 5hmC and decreased level of 5mC in genomic DNA. TET2 overexpression also promoted autophagy and downregulated inflammation factors, such as vascular cell adhesion molecule 1, intercellular adhesion molecule 1, monocyte chemotactic protein 1, and interleukin-1. Consistently, TET2 knockdown with small hairpin RNA (shRNA) in ApoE-/- mice decreased 5hmC and increased 5mC levels in atherosclerotic lesions. Meanwhile, autophagy was inhibited and atherosclerotic lesions progressed with an unstable lesion phenotype characterized by large lipid core, macrophage accumulation, and upregulated inflammation factor expression. Experiments with the cultured endothelial cells revealed that oxidized low-density lipoprotein (ox-LDL) inhibited endothelial cell autophagy. TET2 shRNA strengthened impaired autophagy and autophagic flux in the ox-LDL-treated endothelial cells. TET2 overexpression reversed these effects by decreasing the methylation level of the Beclin 1 promoter, which contributed to the downregulation of inflammation factors. Overall, we identified that TET2 was downregulated during the pathogenesis of atherosclerosis. The downregulation of TET2 promotes the methylation of the Beclin 1 promoter, leading to endothelial cell autophagy, impaired autophagic flux, and inflammatory factor upregulation. Upregulation of TET2 may be a novel therapeutic strategy for treating atherosclerosis.
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Li TT, Li TH, Peng J, He B, Liu LS, Wei DH, Jiang ZS, Zheng XL, Tang ZH. TM6SF2: A novel target for plasma lipid regulation. Atherosclerosis 2018; 268:170-176. [PMID: 29232562 DOI: 10.1016/j.atherosclerosis.2017.11.033] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 11/07/2017] [Accepted: 11/30/2017] [Indexed: 02/08/2023]
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Zeng JF, Zeng ZL, Zhang K, Zhao Y, Liu YM, Chen JJ, Tong H, Wei DH, Jiang ZS, Wang Z. miR-23b-3p and miR-125b-5p downregulate apo(a) expression by targeting Ets1 in HepG2 cells. Cell Biol Int 2017; 42:313-323. [PMID: 29064597 DOI: 10.1002/cbin.10896] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Accepted: 10/22/2017] [Indexed: 12/24/2022]
Abstract
High concentrations of plasma lipoprotein(a) [Lp(a)] have been inferred to be an independent risk factor for cardiovascular and cerebrovascular diseases, such as coronary artery diseases, restenosis, and stroke. Apolipoprotein(a) [apo(a)] is one of the most important components of Lp(a) and contributes greatly to the increased concentration of plasma Lp(a). As a critical positive transacting factor of apo(a) gene, Ets1 has been proven as a target gene of several miRNAs, such as miR-193b, miR-125b-5p, miR-200b, miR-1, and miR-499. In this study, a series of experiments on miRNAs and relative miRNAs inhibitor delivered HepG2 cells were conducted, and two miRNAs that downregulate the apo(a) by targeting the 3'-UTR of Ets1 were identified. Results showed that apo(a) and Ets1 were differentially expressed in SMMC7721 and HepG2 cell lines. Meanwhile, apo(a) and Ets1 were inversely correlated with several hepatic endogenous miRNAs, such as miR-125b-5p, miR-23b-3p, miR-26a-5p, and miR-423-5p, which were predicted to bind to Ets1. Results show that miR-125b-5p and miR-23b-3p mimics could inhibit the synthesis of apo(a) by directly targeting Ets1 in HepG2, thereby reducing the plasma Lp (a) concentration.
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Yu K, Doherty AH, Genik PC, Gookin SE, Roteliuk DM, Wojda SJ, Jiang ZS, McGee-Lawrence ME, Weil MM, Donahue SW. Mimicking the effects of spaceflight on bone: Combined effects of disuse and chronic low-dose rate radiation exposure on bone mass in mice. LIFE SCIENCES IN SPACE RESEARCH 2017; 15:62-68. [PMID: 29198315 DOI: 10.1016/j.lssr.2017.08.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Revised: 07/31/2017] [Accepted: 08/11/2017] [Indexed: 06/07/2023]
Abstract
During spaceflight, crewmembers are subjected to biomechanical and biological challenges including microgravity and radiation. In the skeleton, spaceflight leads to bone loss, increasing the risk of fracture. Studies utilizing hindlimb suspension (HLS) as a ground-based model of spaceflight often neglect the concomitant effects of radiation exposure, and even when radiation is accounted for, it is often delivered at a high-dose rate over a very short period of time, which does not faithfully mimic spaceflight conditions. This study was designed to investigate the skeletal effects of low-dose rate gamma irradiation (8.5 cGy gamma radiation per day for 20 days, amounting to a total dose of 1.7 Gy) when administered simultaneously to disuse from HLS. The goal was to determine whether continuous, low-dose rate radiation administered during disuse would exacerbate bone loss in a murine HLS model. Four groups of 16 week old female C57BL/6 mice were studied: weight bearing + no radiation (WB+NR), HLS + NR, WB + radiation exposure (WB+RAD), and HLS+RAD. Surprisingly, although HLS led to cortical and trabecular bone loss, concurrent radiation exposure did not exacerbate these effects. Our results raise the possibility that mechanical unloading has larger effects on the bone loss that occurs during spaceflight than low-dose rate radiation.
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Peng J, Tang ZH, Ren Z, He B, Zeng Y, Liu LS, Wang Z, Wei DH, Zheng XL, Jiang ZS. TET2 Protects against oxLDL-Induced HUVEC Dysfunction by Upregulating the CSE/H 2S System. Front Pharmacol 2017; 8:486. [PMID: 28798687 PMCID: PMC5526911 DOI: 10.3389/fphar.2017.00486] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 07/07/2017] [Indexed: 12/16/2022] Open
Abstract
Ten-eleven translocation-2 (TET2) protein is a DNA demethylase that regulates gene expression through DNA demethylation and also plays important roles in various diseases including atherosclerosis. Endothelial dysfunction represents an early key event in atherosclerotic disease. The cystathionine-γ-lyase (CSE)/hydrogen sulfide (H2S) is a key endogenous system with protective effects on endothelial functions. In this study, we examined how TET2 regulates oxidized low-density lipoprotein (oxLDL)-induced dysfunction of human umbilical vein endothelial cells (HUVECs) and determined the role of the CSE/H2S system. Treatment with oxLDL resulted in downregulation of both TET2 expression and CSE/H2S system in HUVECs. TET2 was found to have protective effects on oxLDL-induced HUVEC dysfunction, which was confirmed with TET2 overexpression plasmid or TET2 shRNA plasmid. Moreover, TET2 was found to upregulate the CSE/H2S system and inhibit NF-κB activation, leading to decreased expression of ICAM-1 and VCAM-1 and attenuated adhesion of THP-1 cells to oxLDL-activated HUVECs. The protective effect of TET2 was reduced by treatment with CSE siRNA. Further studies revealed that CSE promoter region contains a well-defined CpG island. We also showed that TET2 enhanced 5-hydroxymethylcytosine (5hmC) level and promoted DNA demethylation of CSE gene promoter, leading to an increase in CSE expression. In conclusion, TET2 has protective effects on oxLDL-induced HUVEC dysfunction, likely through upregulating the CSE/H2S system by DNA demethylation of CSE gene promoter. TET2 may become a novel therapeutic target for endothelial dysfunction-associated vascular diseases.
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Wang CY, Zou W, Liang XY, Jiang ZS, Li X, Wei HJ, Tang YY, Zhang P, Tang XQ. Hydrogen sulfide prevents homocysteine‑induced endoplasmic reticulum stress in PC12 cells by upregulating SIRT‑1. Mol Med Rep 2017; 16:3587-3593. [PMID: 28713986 DOI: 10.3892/mmr.2017.7004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Accepted: 05/15/2017] [Indexed: 11/06/2022] Open
Abstract
It was previously confirmed that hydrogen sulfide (H2S) has a neuroprotective effect, preventing homocysteine‑induced neurotoxicity. However, the exact molecular mechanisms underlying this protective effect remain to be fully elucidated. Endoplasmic reticulum (ER) stress contributes to homocysteine‑induced neurotoxicity. Silent mating type information regulator 2 homolog 1 (SIRT‑1) can attenuate ER stress, exerting its neuroprotective effect. Therefore, the present study aimed to investigate whether H2S protects PC12 cells against homocysteine‑induced ER stress and whether SIRT‑1 mediates this protective effect of H2S. Western blotting was used to detect the expression of SIRT‑1, glucose‑regulated protein 78 (GRP78), and cleaved caspase‑12 in PC12 cells. It was observed that sodium hydrosulfide (NaHS), an exogenous H2S donor, significantly attenuated the homocysteine‑induced ER stress responses, including increases in the protein expression levels of GRP78 and cleaved caspase‑12. Simultaneously, NaHS upregulated the expression of SIRT‑1 and reversed the homocysteine‑induced downregulation of SIRT‑1 in PC12 cells. Sirtinol, a specific inhibitor of SIRT‑1, eliminated the protective effects of H2S in homocysteine‑induced ER stress. These data indicated that H2S prevented homocysteine‑induced ER stress via enhancing the expression of SIRT‑1. These findings offer novel insight into the protective mechanisms of H2S against homocysteine‑induced neurotoxicity.
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Tang ZH, Peng J, Ren Z, Yang J, Li TT, Li TH, Wang Z, Wei DH, Liu LS, Zheng XL, Jiang ZS. New role of PCSK9 in atherosclerotic inflammation promotion involving the TLR4/NF-κB pathway. Atherosclerosis 2017; 262:113-122. [DOI: 10.1016/j.atherosclerosis.2017.04.023] [Citation(s) in RCA: 109] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 04/13/2017] [Accepted: 04/28/2017] [Indexed: 01/13/2023]
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Hu HJ, Jiang ZS, Qiu J, Zhou SH, Liu QM. Protective effects of hydrogen sulfide against angiotensin II-induced endoplasmic reticulum stress in HUVECs. Mol Med Rep 2017; 15:2213-2222. [DOI: 10.3892/mmr.2017.6238] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 10/05/2016] [Indexed: 11/05/2022] Open
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Zhao XS, Wu Q, Peng J, Pan LH, Ren Z, Liu HT, Jiang ZS, Wang GX, Tang ZH, Liu LS. Hyperlipidemia-induced apoptosis of hippocampal neurons in apoE(-/-) mice may be associated with increased PCSK9 expression. Mol Med Rep 2016; 15:712-718. [PMID: 28000893 PMCID: PMC5364825 DOI: 10.3892/mmr.2016.6055] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 09/27/2016] [Indexed: 02/02/2023] Open
Abstract
Hyperlipidemia is a risk factor for Alzheimer's disease (AD) and other neurodegenerative diseases. Proprotein convertase subtilisin/kexin type 9 (PCSK9) is a lipid regulatory gene involved in cell apoptosis. However, the function and mechanism of PCSK9 in neuronal apoptosis following hyperlipidemia remains to be elucidated. The present study established a hyperlipidemic mouse model by feeding a high-fat diet (HFD) to 6-week-old apoE(−/−) mice. Plasma lipid levels, hippocampal lipid accumulation, hippocampal histology, and hippocampal neuronal apoptosis were all monitored for changes. The expression levels of PCSK9, β-secretase 1 (BACE1), B-cell lymphoma 2 (Bcl-2), Bcl-2-associated X protein (Bax), and caspase-3 in hippocampal CA3 and CA1 neurons were also measured. Results demonstrated that a HFD increased the lipid accumulation in the CA3 hippocampus and the levels of plasma lipids, including triglycerides, total cholesterol, low-density lipoprotein, and high-density lipoprotein. In addition, CA3 neurons in the HFD group indicated apparent injuries and increased neuronal apoptosis, which are associated with the expression of Bcl-2, Bax, and caspase-3. A HFD also increased the expression levels of PCSK9 and BACE1. BACE1 promotes cleavage of amyloid precursor proteins to generate β-amyloid peptide (Aβ), which induces neuronal apoptosis. Protein levels of Aβ are associated with the observation of amyloid plaques in the hippocampus of the HFD group. The results suggest that hyperlipidemia regulates neuronal apoptosis by increasing PCSK9 and BACE1 expression. Overall, the current study may elucidate the role of lipid metabolism disorder in AD pathogenesis.
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Hu HJ, Jiang ZS, Zhou SH, Liu QM. Hydrogen sulfide suppresses angiotensin II-stimulated endothelin-1 generation and subsequent cytotoxicity-induced endoplasmic reticulum stress in endothelial cells via NF-κB. Mol Med Rep 2016; 14:4729-4740. [DOI: 10.3892/mmr.2016.5827] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2015] [Accepted: 08/09/2016] [Indexed: 11/06/2022] Open
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Zhong QQ, Wang X, Li YF, Peng LJ, Jiang ZS. Secretory leukocyte protease inhibitor promising protective roles in obesity-associated atherosclerosis. Exp Biol Med (Maywood) 2016; 242:250-257. [PMID: 27698252 DOI: 10.1177/1535370216672747] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Secretory leukocyte protease inhibitor (SLPI), a serine protease inhibitor, which was most commonly examined in mucosal fluids such as saliva, is a versatile molecule and plays non-redundant roles. In addition to its anti-protease activity, SLPI has been shown to express anti-bacterial, anti-viral, anti-fungal, and anti-inflammatory properties as well as participating in innate and adaptive immune responses, most of which has been well documented. Recently, it is reported that SLPI is expressed in adipocytes and adipose tissue where it could play an important feedback role in the resolution of inflammation. Furthermore, circulating SLPI has been shown to correlate with progressive metabolic dysfunction. Moreover, adenoviral gene delivery of elafin and SLPI attenuates nuclear factor-κB-dependent inflammatory responses of human endothelial cells and macrophages to atherogenic stimuli. This review contributes to unraveling the protective role of SLPI in obesity-related atherosclerosis development, and the potential role in preventing arterial plaque rupture.
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Guo F, Peng LJ, Fu MG, Jiang ZS. [Genome editing and gene transcriptional regulation mediated by CRISPR-Cas system]. SHENG LI KE XUE JIN ZHAN [PROGRESS IN PHYSIOLOGY] 2016; 47:331-334. [PMID: 29893534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
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63
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Li XP, Hao CL, Wang Q, Yi XM, Jiang ZS. H19 gene methylation status is associated with male infertility. Exp Ther Med 2016; 12:451-456. [PMID: 27347077 DOI: 10.3892/etm.2016.3314] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2014] [Accepted: 02/11/2016] [Indexed: 12/24/2022] Open
Abstract
The present study investigated the H19 gene methylation status in male infertility. Between March 2013 and June 2014, semen samples were collected from 15 normal fertile males and 15 males experiencing infertility, and routine analysis and sperm morphological assessment were performed. The semen samples were subjected to density gradient centrifugation to separate the sperm fraction, and genomic DNA from the sperms was extracted and treated for bisulfite modification. Following in vitro amplification by polymerase chain reaction (PCR), the purified PCR products were cloned into pMD®18-T vectors and successful cloning was confirmed by restriction enzyme digestion. Positive clones were sequenced and the DNA methylation status was analyzed. The overall methylation rate in the normal fertile group was 100% (270/270), whereas in the infertile group the methylation rate was lower at 94.1% (525/558), revealing a statistically significant decrease in overall methylation rate in the infertile patients compared with the control group (χ2=15.12; P<0.001). The average methylation rates of CpG 1, 3 and 6 in the infertile group were statistically different from those in the normal control group (all P<0.05). The abnormal methylation of imprinted gene H19 is associated with male infertility, suggesting that H19 may serve as a biomarker for the detection of defects in human spermiogenesis.
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Tan X, Gao J, Shi Z, Tai S, Chan LL, Yang Y, Peng DQ, Liao DF, Jiang ZS, Chang YZ, Gui Y, Zheng XL. MG132 Induces Expression of Monocyte Chemotactic Protein-Induced Protein 1 in Vascular Smooth Muscle Cells. J Cell Physiol 2016; 232:122-8. [PMID: 27035356 DOI: 10.1002/jcp.25396] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 03/29/2016] [Indexed: 11/07/2022]
Abstract
Monocyte chemoattractant protein-1 (MCP-1) has been reported to induce the expression of monocyte chemotactic protein-induced protein 1 (MCPIP1), which undergoes ubiquitination degradation. Therefore, we predict that in vascular smooth muscle (VSMCs), MCPIP1 may be induced by MCP-1 and undergo degradation, which can be inhibited by the proteasome inhibitor, MG132. Our results showed that treatment of human VSMCs with MCP-1 did not increase the expression of MCPIP1. Treatment with MG132, however, elevated MCPIP1 protein levels through stimulation of the gene transcription, but not through increasing protein stability. MCPIP1 expression induced by MG132 was inhibited by α-amanitin inhibition of gene transcription or cycloheximide inhibition of protein synthesis. Our further studies showed that MCPIP1 expression induced by MG132 was inhibited by the inhibitors of AKT and p38 kinase, suggesting a role of the AKT-p38 pathway in MG132 effects. We also found that treatment with MG132 induces apoptosis, but overexpression of MCPIP1 inhibited bromodeoxyuridine (BrdU) incorporation of human VSMCs without induction of significant apoptosis. In summary, MCPIP1 expression is induced by MG132 likely through activation of the AKT-p38 pathway. MCPIP1 inhibits SMC proliferation without induction of apoptosis. J. Cell. Physiol. 232: 122-128, 2017. © 2016 Wiley Periodicals, Inc.
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Liu MH, Zhang Y, He J, Tan TP, Wu SJ, Guo DM, He H, Peng J, Tang ZH, Jiang ZS. Hydrogen sulfide protects H9c2 cardiac cells against doxorubicin-induced cytotoxicity through the PI3K/Akt/FoxO3a pathway. Int J Mol Med 2016; 37:1661-8. [PMID: 27081862 DOI: 10.3892/ijmm.2016.2563] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Accepted: 03/30/2016] [Indexed: 11/06/2022] Open
Abstract
Doxorubicin (DOX) is an efficient drug used in cancer therapy that also produces reactive oxygen species (ROS) that induces severe cytotoxicity, which limits its clinical application. Hydrogen sulfide (H2S), a novel gasotransmitter, has been shown to exert cardioprotective effects. The present study aimed to determine whether exogenous H2S protects H9c2 cardiac cells against DOX-induced cytotoxicity and whether these protective effects are mediated through the PI3K/Akt/FoxO3a pathway. The H9c2 cardiac cells were exposed to 5 µM DOX for 24 h to establish a model of DOX-induced cardiotoxicity. The results showed that the treatment of H9c2 cardiac cells with sodium hydrosulfide (NaHS) for 30 min prior to DOX exposure markedly attenuated the phosphorylation of Akt and FoxO3a. Notably, pre-treatment of the H9c2 cells with NaHS significantly attenuated the nuclear localization of FoxO3a as well as the apoptosis of H9c2 cells induced by DOX. The treatment of H9c2 cells with N-acetyl-L-cysteine (NAC), a scavenger of ROS, prior to DOX exposure, also markedly increased the phosphorylation of Akt and FoxO3a which was inhibited by DOX alone. Furthermore, pre-treatment with LY294002, a selective inhibitor of PI3K/Akt, reversed the protective effect of H2S against DOX-induced injury of cardiomyocytes, as demonstrated by an increased number of apoptotic cells, a decrease in cell viability and the reduced phosphorylation of Akt and FoxO3a. These findings suggested that exogenous H2S attenuates DOX-induced cytotoxic effects in H9c2 cardiac cells through the PI3K/Akt/FoxO3a pathway.
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Han JL, Wang W, Jiang ZS, Kong DL, Shen H, Qin Z, Wang L, Huang H, Jiang DD, Kang J. [The expression of serum endoplasmic reticulum stress protein-78 in obstructive sleep apnea patients]. ZHONGHUA NEI KE ZA ZHI 2016; 55:298-301. [PMID: 27030619 DOI: 10.3760/cma.j.issn.0578-1426.2016.04.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
OBJECTIVE This study aimed to detect serum level of glucose regulated protein 78(GRP78) in patients with obstructive sleep apnea(OSA) and explore the relationship between endoplasmic reticulum stress and the pathophysiology of OSA. METHODS A total of 91 patients with OSA were enrolled in this study, including 30 mild, 28 moderate and 33 severe. The other 27 obese subjects were of age, gender and BMI matched group. Eleven moderate or severe OSA patients were administrated with continuous positive airway pressure (CPAP) treatment for 24 hours. Polysomnography, apnea hypopnea index (AHI), lowest arterial oxygen saturation(SaO2) and percentage of time spent at SaO2 below 90% (SIT90) were measured before and after sleep. Serum GRP78 was measured by ELISA. RESULTS The expression of GRP78 in mild(3.42±0.97)μg/L, moderate(2.67±1.14)μg/L and severe(2.62±1.11)μg/L OSA groups was significantly higher than in control group(1.75±0.41)μg/L (P<0.05). The GRP78 level in mild OSA group was significantly higher than either moderate or severe OSA group (P<0.05). After 24 h treatment of CPAP, serum GRP78 level decreased significantly [(1.77±0.39)μg/L vs(2.84±0.39)μg/L; P<0.05]. CONCLUSIONS Endoplasmic reticulum stress involves in the pathophysiology of patients with OSA. Higher GRP78 level in mild OSA patients suggests that endoplasmic reticulum related protein GRP 78 might rise then fall during exacerbation of OSA.
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Wang C, Wang WJ, Yan YG, Xiang YX, Zhang J, Tang ZH, Jiang ZS. MicroRNAs: New players in intervertebral disc degeneration. Clin Chim Acta 2015; 450:333-41. [DOI: 10.1016/j.cca.2015.09.011] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 08/29/2015] [Accepted: 09/10/2015] [Indexed: 12/20/2022]
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Qu SL, Fan WJ, Zhang C, Guo F, Pan WJ, Han D, Li W, Zhu YN, Jiang ZS. Mipu1 Inhibits Lipid Accumulation Through Down-Regulation of CD36 in RAW264.7 Cells. Cell Physiol Biochem 2015; 37:879-89. [DOI: 10.1159/000430215] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/28/2015] [Indexed: 11/19/2022] Open
Abstract
Background/Aims: Our recent data indicated that Mipu1 overexpression reduces lipid intake and CD36 expression of macrophages in the presence of oxLDL. However, the mechanism of Mipu1 inhibiting lipid accumulation in macrophages is not elucidated. Methods: Real-time quantitative polymerase chain reaction (PCR) and western blot analysis were used to detect expression of Mipu1 and CD36. The promoter activity of CD36 was studied using luciferase assays. Chromatin immunoprecipitation (ChIP) was used to show the recruitment of Mipu1 onto the CD36 promoter. High-performance liquid chromatography and Dil-labeled lipoprotein were used to detect cholesterol accumulation. Results: Here, we show that CD36 overexpression rescues oxLDL-induced cholesterol accumulation in RAW264.7-Mipu1 cells. Analysis of the mouse CD36 promoter revealed two potential Mipu1-response elements (MRE), one of which (from -237bp to -244bp, ACTTAC) was shown, using mutagenesis and deletion analysis, to be functional. Mipu1 was demonstrated to bind to CD36 promoter, and oxLDL treatment resulted in increases in their interaction as assessed by ChIP. Conclusions: It was demonstrated that Mipu1 inhibited the lipid accumulation of macrophages and it down-regulated CD36 expression in the presence of oxLDL.
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Pan ZY, Jiang ZS, Ouyang HQ. Study of the methylation patterns of the EGFR gene promoter in non-small cell lung cancer. GENETICS AND MOLECULAR RESEARCH 2015; 14:9813-20. [PMID: 26345914 DOI: 10.4238/2015.august.19.14] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
We investigated the methylation state of the epidermal growth factor receptor (EGFR) gene promoter in non-small cell lung cancer (NSCLC) and analyzed its effect on tumor biology. We enrolled 120 patients with NSCLC who had been confirmed by pathologic diagnosis and had been operated on. The methylation states of the EGFR gene promoter were detected and analyzed and a prognosis was given. NSCLC cell lines and nude mice were used to study the treatment reactivity of gefitinib (an EGFR inhibitor) with or without 5-aza-2'-deoxycytidine (5-aza-CdR) intervention. EGFR expression was high when the methylation degree was lower in patients with adenocarcinoma and poor pathological differentiation of tumor than in patients with squamous cell carcinoma and good pathological differentiation. NSCLC cells with low expression of EGFR and high methylation in the promoter region were insensitive to EGFR-targeted therapy. However, apoptosis and proliferation inhibition of cancer cells were even more pronounced when 5-aza-CdR was used to inhibit methylation. An in vivo study confirmed that methylation adjuvant therapy can improve the sensitivity of cancer to EGFR-targeted therapy. Application of a demethylating agent could be an important supplement for improving EGFR inhibition in the treatment of NSCLC, especially in those who are insensitive to the use of an EGFR inhibitor alone.
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Zhang Y, Qu SL, Tang ZH, Ren Z, Liu MH, Luo XY, Liu LS, Gui Y, Zheng XL, Jiang ZS. Hydrogen sulfide prevents doxorubicin-induced apoptosis of H9c2 cardiomyocytes through activation of AMPK. Nitric Oxide 2015. [DOI: 10.1016/j.niox.2015.02.137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Luo XY, Tang ZH, Qu SL, Peng J, Tang H, Ren Z, Ren XQ, Xiao WJ, Gui Y, Zheng XL, Jiang ZS. Hydrogen sulfide inhibits hydrogen peroxide-induced senescence of human umbilical vascular endothelial cells through activation of the SIRT1/FoxO1 pathway. Nitric Oxide 2015. [DOI: 10.1016/j.niox.2015.02.114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Qu SL, Fan WJ, Zhang C, Guo F, Han D, Pan WJ, Li W, Feng DM, Jiang ZS. Mipu1 overexpression protects macrophages from oxLDL-induced foam cell formation and cell apoptosis. DNA Cell Biol 2015; 33:839-46. [PMID: 25141035 DOI: 10.1089/dna.2014.2501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Mipu1 (myocardial ischemic preconditioning upregulated protein 1) is a novel N-terminal Kruppel-associated box (KRAB)/C2H2 zinc finger superfamily protein, that displays a powerful effect in protecting H9c2 cells from oxidative stress-induced cell apoptosis. The present study aims to investigate the effect of Mipu1 overexpression on oxidized low-density lipoprotein (oxLDL)-induced foam cell formation, cell apoptosis, and its possible mechanisms. New Zealand healthy rabbits were used to establish atherosclerosis model, and serum levels of triglycerides, total cholesterol, high-density lipoprotein cholesterol, and low-density lipoprotein cholesterol were detected by an automatic biochemical analyzer. Sudan IV staining was used to detect atherosclerotic lesions. The RAW264.7 macrophage cell line was selected as the experimental material. Oil red O staining, high-performance liquid chromatography, and Dil-labeled lipoprotein were used to detect cholesterol accumulation qualitatively and quantitatively, respectively. Flow cytometry was used to determine cell apoptosis. Real-time quantitative polymerase chain reaction (PCR) was used to detect the mRNA expression of the main proteins that are associated with the transport of cholesterol, such as ABCA1, ABCG1, SR-BI, and CD36. Western blot analysis was used to detect the protein expression of Mipu1. There were atherosclerotic lesions in the high-fat diet group with Sudan IV staining. High-fat diet decreased Mipu1 expression and increased CD36 expression significantly at the 10th week compared with standard-diet rabbits. Mipu1 overexpression decreased oxLDL-induced cholesterol accumulation, oxLDL uptake, cell apoptosis, and cleaved caspase-3. Mipu1 overexpression inhibited the oxLDL-induced CD36 mRNA and protein expression, but it did not significantly inhibit the mRNA expression of ABCA1, ABCG1, and SR-BI. Mipu1 overexpression inhibits oxLDL-induced foam cell formation and cell apoptosis. Mipu1 overexpression reduces the lipid intake of macrophages and might be associated with the downregulation of CD36 expression in the presence of oxLDL.
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Han D, Zhang C, Fan WJ, Pan WJ, Feng DM, Qu SL, Jiang ZS. Myocardial ischemic preconditioning upregulated protein 1(Mipu1):zinc finger protein 667 - a multifunctional KRAB/C2H2 zinc finger protein. ACTA ACUST UNITED AC 2014; 48:1-5. [PMID: 25493376 PMCID: PMC4288486 DOI: 10.1590/1414-431x20144029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Accepted: 07/23/2014] [Indexed: 11/22/2022]
Abstract
Myocardial ischemic preconditioning upregulated protein 1 (Mipu1) is a newly discovered upregulated gene produced in rats during the myocardial ischemic preconditioning process. Mipu1 cDNA contains a 1824-base pair open reading frame and encodes a 608 amino acid protein with an N-terminal Krüppel-associated box (KRAB) domain and classical zinc finger C2H2 motifs in the C-terminus. Mipu1 protein is located in the cell nucleus. Recent studies found that Mipu1 has a protective effect on the ischemia-reperfusion injury of heart, brain, and other organs. As a nuclear factor, Mipu1 may perform its protective function through directly transcribing and repressing the expression of proapoptotic genes to repress cell apoptosis. In addition, Mipu1 also plays an important role in regulating the gene expression of downstream inflammatory mediators by inhibiting the activation of activator protein-1 and serum response element.
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Jiang ZS, Jia HX, Xing WJ, Han CD, Wang J, Zhang ZJ, Qu W. Investigation of several biomarkers associated with diabetic nephropathy. Exp Clin Endocrinol Diabetes 2014; 123:1-6. [PMID: 25314649 DOI: 10.1055/s-0034-1385875] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
OBJECTIVE The aim of this study was to facilitate the systematic discovery of diagnostic biomarkers of diabetic nephropathy (DN). METHODS 3 publicly available independent cohorts were got from Gene Expression Omnibus database. Gene expression array were used to screen for genome-wide relative significance (GWRS) and genome-wide global significance (GWGS). The most significant up- and down-regulated top 100 gene signatures were identified using a fold change based model. Then the protein-protein interaction (PPI) network was constructed, while the hub genes in this PPI network were identified by centrality analysis. Modules detection was performed to explore the functions of the modules. Meanwhile, gene enrichment analysis was performed to illuminate the biological pathways and processes associated with DN. RESULTS The most significant up- and down-regulated top 100 gene signatures were identified and a PPI network was established. Several hub genes (VEGFA, IL8, MYC, CD14, ALB) were discovered. Several functional modules were revealed. Biological pathways including cytokine-cytokine receptor interaction and p53 signaling pathway, and processes including inflammatory response, response to wounding and enzyme linked receptor protein signaling pathway were identified. CONCLUSION Our study displayed underlying biomarkers including biological pathways and several hub genes of DN.
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Luo XY, Qu SL, Tang ZH, Zhang Y, Liu MH, Peng J, Tang H, Yu KL, Zhang C, Ren Z, Jiang ZS. SIRT1 in cardiovascular aging. Clin Chim Acta 2014; 437:106-14. [PMID: 25063737 DOI: 10.1016/j.cca.2014.07.019] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2014] [Revised: 07/14/2014] [Accepted: 07/15/2014] [Indexed: 12/21/2022]
Abstract
Cardiovascular disease (CVD) is the leading cause of death worldwide, with aging as the key independent risk factor. Effective interventions are necessary to delay aging. Sirtuin1 (SIRT1), a NAD(+)-dependent histone deacetylase, is closely related to lifespan extension. SIRT1 exerts beneficial effects on aging and age-related diseases, such as atherosclerosis. In this review, we summarize the current knowledge on the functions of SIRT1 in cardiovascular aging, focusing on the underlying molecular mechanisms, including inhibition of oxidative stress and inflammation, and induction of autophagy. We also demonstrate that moderate up-regulation or activation of SIRT1 in cardiovascular aging and age-related CVD may confer important application values.
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