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Wang D, Jin MF, Li L, Liu Y, Sun Y, Ni H. PRG5 Knockout Precipitates Late-Onset Hypersusceptibility to Pilocarpine-Induced Juvenile Seizures by Exacerbating Hippocampal Zinc Signaling-Mediated Mitochondrial Damage. Front Neurosci 2021; 15:715555. [PMID: 34512249 PMCID: PMC8430038 DOI: 10.3389/fnins.2021.715555] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 07/30/2021] [Indexed: 11/13/2022] Open
Abstract
Introduction Epileptogenesis is understood as the plastic process that produces a persistent reorganization of the brain’s neural network after a precipitating injury (recurrent neonatal seizures, for instance) with a latent period, finally leading to neuronal hyperexcitability. Plasticity-related genes (PRGs), also known as lipid phosphate phosphatase-related proteins (PLPPRs), are regulators of mitochondrial membrane integrity and energy metabolism. This study was undertaken to determine whether PRG5 gene knockout contributes to the delayed hypersensitivity induced by developmental seizures and the aberrant sprouting of hippocampal mossy fibers, and to determine whether it is achieved through the mitochondrial pathway. Here, we developed a “twist” seizure model by coupling pilocarpine-induced juvenile seizures with later exposure to penicillin to test the long-term effects of PRG5 knockout on seizure latency through comparison with wild-type (WT) mice. Hippocampal mossy fiber sprouting (MFS) was detected by Timm staining. In order to clarify the mechanism of the adverse reactions triggered by PRG5 knockout, hippocampal HT22 neuronal cultures were exposed to glutamate, with or without PRG5 interference. Mitochondrial function, oxidative stress indicators and zinc ion content were detected. Results PRG5 gene knockout significantly reduced the seizure latency, and aggravated the lowered seizure threshold induced by developmental seizures. Besides, knockout of the PRG5 gene reduced the MFS scores to a certain extent. Furthermore, PRG5 gene silencing significantly increases the zinc ion content in hippocampal neurons, impairs neuronal activity and mitochondrial function, and exacerbates glutamate-induced oxidative stress damage. Conclusion In summary, PRG5 KO is associated with significantly greater hypersusceptibility to juvenile seizures in PRG5(–/–) mice compared with WT mice. These effects may be related to the hippocampal zinc signaling. The effects do not appear to be related to changes in MFS because KO mice with juvenile seizures had the shortest seizure latencies but exhibited less MFS than WT mice with juvenile seizures.
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Affiliation(s)
- Dandan Wang
- Division of Brain Science, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China.,Department of Pediatrics, First Affiliated Hospital of University of Science and Technology of China, Hefei, China
| | - Mei-Fang Jin
- Division of Brain Science, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
| | - Lili Li
- Division of Brain Science, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
| | - Yueying Liu
- Department of Pediatrics, North Branch, Affiliated Hospital of Jiangnan University, Wuxi, China
| | - Yuxiao Sun
- Division of Brain Science, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
| | - Hong Ni
- Division of Brain Science, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
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Zheng YQ, Jin MF, Suo GH, Wu YJ, Sun YX, Ni H. Proteomics for Studying the Effects of Ketogenic Diet Against Lithium Chloride/Pilocarpine Induced Epilepsy in Rats. Front Neurosci 2020; 14:562853. [PMID: 33132826 PMCID: PMC7550537 DOI: 10.3389/fnins.2020.562853] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 09/02/2020] [Indexed: 12/12/2022] Open
Abstract
The ketogenic diet (KD) demonstrates antiepileptogenic and neuroprotective efficacy, but the precise mechanisms are unclear. Here we explored the mechanism through systematic proteomics analysis of the lithium chloride-pilocarpine rat model. Sprague-Dawley rats (postnatal day 21, P21) were randomly divided into control (Ctr), seizure (SE), and KD treatment after seizure (SE + KD) groups. Tandem mass tag (TMT) labeling and liquid chromatography-tandem mass spectroscopy (LC-MS/MS) were utilized to assess changes in protein abundance in the hippocampus. A total of 5,564 proteins were identified, of which 110 showed a significant change in abundance between the SE and Ctr groups (18 upregulated and 92 downregulated), 278 between SE + KD and SE groups (218 upregulated and 60 downregulated), and 180 between Ctr and SE + KD groups (121 upregulated and 59 downregulated) (all p < 0.05). Seventy-nine proteins showing a significant change in abundance between SE and Ctr groups were reciprocally regulated in the SD + KD group compared to the SE group (i.e., the seizure-induced change was reversed by KD). Of these, five (dystrobrevin, centromere protein V, oxysterol-binding protein, tetraspanin-2, and progesterone receptor membrane component 2) were verified by parallel reaction monitoring. Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis indicated that proteins of the synaptic vesicle cycle pathway were enriched both among proteins differing in abundance between SE and Ctr groups as well as between SE + KD and SE groups. This comprehensive proteomics analyze of KD-treated epilepsy by quantitative proteomics revealed novel molecular mechanisms of KD antiepileptogenic efficacy and potential treatment targets.
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Affiliation(s)
- Yu-Qin Zheng
- Division of Brain Science, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China.,Department of Pediatrics, Affiliated Hospital of Nantong University, Nantong, China
| | - Mei-Fang Jin
- Division of Brain Science, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
| | - Gui-Hai Suo
- Department of Pediatrics, Affiliated Hospital of Nantong University, Nantong, China
| | - You-Jia Wu
- Department of Pediatrics, Affiliated Hospital of Nantong University, Nantong, China
| | - Yu-Xiao Sun
- Division of Brain Science, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
| | - Hong Ni
- Division of Brain Science, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
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Ni H, Chen SH, Li LL, Jin MF. Alterations in the Neurobehavioral Phenotype and ZnT3/CB-D28k Expression in the Cerebral Cortex Following Lithium-Pilocarpine-Induced Status Epilepticus: the Ameliorative Effect of Leptin. Biol Trace Elem Res 2019; 187:100-106. [PMID: 29687372 DOI: 10.1007/s12011-018-1343-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Accepted: 04/10/2018] [Indexed: 12/31/2022]
Abstract
Zinc transporter 3 (ZnT3)-dependent "zincergic" vesicular zinc accounts for approximately 20% of the total zinc content of the mammalian telencephalon. Elevated hippocampal ZnT3 expression is acknowledged to be associated with mossy fiber sprouting and cognitive deficits. However, no studies have compared the long-term neurobehavioral phenotype with the expression of ZnT3 in the cerebral cortex following status epilepticus (SE). The aim of this study was to investigate changes in the long-term neurobehavioral phenotype as well as the expression of ZnT3 and calcium homeostasis-related CB-D28k in the cerebral cortex of rats subjected to neonatal SE and to determine the effects of leptin treatment immediately after neonatal SE. Fifty Sprague-Dawley rats (postnatal day 6, P6) were randomly assigned to two groups: the pilocarpine hydrochloride-induced status epilepticus group (RS, n = 30) and control group (n = 20). Rats were further divided into the control group without leptin (Control), control-plus-leptin treatment group (Leptin), RS group without leptin treatment (RS), and RS-plus-leptin treatment group (RS + Leptin). On P6, all rats in the RS group and RS + Leptin group were injected intraperitoneally (i.p.) with lithium chloride (5 mEq/kg). Pilocarpine (320 mg/kg, i.p.) was administered 30 min after the scopolamine methyl chloride (1 mg/kg) injection on P7. From P8 to P14, animals of the Leptin group and RS + Leptin group were given leptin (4 mg/kg/day, i.p.). The neurological behavioral parameters (negative geotaxis reaction reflex, righting reflex, cliff avoidance reflex, forelimb suspension reflex, and open field test) were observed from P23 to P30. The protein levels of ZnT3 and CB-D28k in the cerebral cortex were detected subsequently by the western blot method. Pilocarpine-treated neonatal rats showed long-term abnormal neurobehavioral parameters. In parallel, there was a significantly downregulated protein level of CB-D28k and upregulated protein level of ZnT3 in the cerebral cortex of the RS group. Leptin treatment soon after epilepticus for 7 consecutive days counteracted these abnormal changes. Taken together with the results from our previous reports on another neonatal seizure model, which showed a significant positive inter-relationship between ZnT3 and calcium/calmodulin-dependent protein kinase IIα (CaMKIIα), the data here suggest that ZnT3/CB-D28k-associated Zn (2+)/Ca(2+) signaling might be involved in neonatal SE-induced long-term brain damage in the aspects of neurobehavioral impairment. Moreover, consecutive leptin treatment is effect at counteracting these hyperexcitability-related changes, suggesting a potential clinical significance.
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Affiliation(s)
- Hong Ni
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, No.303, Jingde Road, 215003, Suzhou, People's Republic of China.
| | - Su-Hong Chen
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, No.303, Jingde Road, 215003, Suzhou, People's Republic of China
| | - Li-Li Li
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, No.303, Jingde Road, 215003, Suzhou, People's Republic of China
| | - Mei-Fang Jin
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, No.303, Jingde Road, 215003, Suzhou, People's Republic of China
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Li LL, Jin MF, Ni H. Zinc/CaMK II Associated-Mitophagy Signaling Contributed to Hippocampal Mossy Fiber Sprouting and Cognitive Deficits Following Neonatal Seizures and Its Regulation by Chronic Leptin Treatment. Front Neurol 2018; 9:802. [PMID: 30319532 PMCID: PMC6168633 DOI: 10.3389/fneur.2018.00802] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 09/06/2018] [Indexed: 01/23/2023] Open
Abstract
The role of leptin in the pathogenesis of epilepsy is getting more and more attention in clinical and basic research. Although there are data indicating neuroprotective effects of elevated serum/brain leptin levels following acute seizures, no study to date has dealt with the impact of chronic leptin treatment on long-term brain injury following developmental seizures. The aim of this study was to evaluate whether chronic leptin treatment may have neuroprotective effects on cognitive and hippocampal mossy fiber sprouting following flurothyl-induced recurrent neonatal seizures and whether these effects are mediated by the zinc/CaMKII-associated mitophagy signaling pathway. Forty Sprague-Dawley rats (postnatal day 6, P6) were randomly assigned into two groups: neonatal seizure group and control group. At P13, they were further divided into control group, seizure group (RS), control + leptin (leptin, i.p., 2 mg/kg/day for 10 days), seizure+leptin group (RS+Leptin, 2mg/kg/day, i.p., for 10 consecutive days). Morris water maze test was performed during P27-P32. Subsequently, Timm staining and Western blotting were used to detect the mossy fiber sprouting and protein levels in hippocampus. Flurothyl-induced seizures (RS group) significantly down-regulated mitophagy markers PINK, Drp1, PHB, and memory marker CaMK II alpha while up-regulating zinc transporters ZnT3, ZnT4, ZIP7, and autophagy execution molecular cathepsin-E, which were paralleled with hippocampal aberrant mossy fiber sprouting and cognitive dysfunction. However, these changes were restored by chronic leptin treatment (RS+Leptin group). The results showed that leptin had neuroprotective effect on hippocampal pathological damage and cognitive deficits induced by neonatal seizures and suggested that Zinc/CaMK II associated-mitophagy signaling pathway in hippocampus may be a new target of leptin's neuroprotection, with potential value of translational medicine.
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Affiliation(s)
- Li-Li Li
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
| | - Mei-Fang Jin
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
| | - Hong Ni
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
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Jin MF, Ni H, Li LL. Leptin Maintained Zinc Homeostasis Against Glutamate-Induced Excitotoxicity by Preventing Mitophagy-Mediated Mitochondrial Activation in HT22 Hippocampal Neuronal Cells. Front Neurol 2018; 9:322. [PMID: 29867731 PMCID: PMC5954240 DOI: 10.3389/fneur.2018.00322] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Accepted: 04/24/2018] [Indexed: 12/22/2022] Open
Abstract
Developmental seizure-induced long-term neuronal hyperexcitation is partially mediated by regenerative mossy fiber sprouting in hippocampus. Yet, there are no effective drugs available to block this pathological process. Recently, leptin has been shown to prevent the sprouting of hippocampal mossy fibers and abnormalities in the neurobehavioral parameters. However, their underlying molecular mechanisms are largely unknown. The purpose of this study was to determine the effect of glutamate on the parameters of zinc homeostasis, mitochondrial functions, and mitophagy regulating factors, as well as to investigate the protective effects of leptin against cytotoxicity of glutamate in murine HT22 hippocampal neuronal cells. Cells were assigned to one of the four groups as follows: control group, leptin alone group, glutamate injury group, and leptin pretreatment group. Our results demonstrated that glutamate induced a decrease in superoxide dismutase, GSH (glutathione), and mitochondrial membrane potential and an increase in GSSG (oxidized glutathione), mitochondrial reactive oxygen species, and supplementation of leptin blocked the toxic effect of glutamate on cell survival. The glutamate-induced cytotoxicity was associated with an increase in mitophagy and intracellular zinc ion levels. Furthermore, glutamate activated the mitophagy markers PINK1, Parkin, and the ratio of LC3-II/LC3-I, as well as increased the expression of zinc transporter 3 (ZnT3). Leptin corrected these glutamate-caused alterations. Finally, the mitophagy inhibitor, CsA, significantly reduced intracellular zinc ion content and ZnT3 expression. These results suggest that mitophagy-mediated zinc dyshomeostasis and mitochondrial activation contributed to glutamate-induced HT22 neuronal cell injury and that leptin treatment could counteract these detrimental effects, thus highlighting mitophagy-mediated zinc homeostasis via mitochondrial activation as a potential strategy to counteract neuroexcitotoxicity.
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Affiliation(s)
- Mei-Fang Jin
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
| | - Hong Ni
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
| | - Li-Li Li
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
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Ni H, Chen SH, Li LL, Jin MF. Leptin treatment prevents long-term abnormalities in cognition, seizure threshold, hippocampal mossy fiber sprouting and ZnT3/CB-D28k expression in a rat developmental "twist" seizure model. Epilepsy Res 2017; 139:164-170. [PMID: 29287786 DOI: 10.1016/j.eplepsyres.2017.12.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2017] [Revised: 11/30/2017] [Accepted: 12/08/2017] [Indexed: 12/24/2022]
Abstract
The mechanism of linking neonatal seizures with long-term brain damage is unclear, and there is no effective drug to block this long-term pathological process. Recently, the fat-derived hormone leptin has been appreciated for its neuroprotective function in neurodegenerative processes, although less is known about the effects of leptin on neonatal seizure-induced brain damage. Here, we developed a "twist" seizure model by coupling pilocarpine-induced neonatal status epilepticus (SE) with later exposure to penicillin to test whether leptin treatment immediately after neonatal SE would exert neuroprotective effects on cognition, seizure threshold and hippocampal mossy fiber sprouting, as well if leptin had any influence on the expression of zinc transporter 3 (ZnT3) and calcium homeostasis-related CB-D28k in the hippocampus. Fifty Sprague-Dawley rats (postnatal day 6, P6) were randomly assigned to four groups: control (n = 10), control with intraperitoneal (i.p.) injection of leptin (Leptin, n = 10), pilocarpine-induced neonatal SE (RS), and RS i.p. leptin injection (RS+Leptin). At P6, all the rats in the RS group and RS+Leptin group were injected with lithium chloride i.p. (5 mEq/kg). Pilocarpine (320 mg/kg, i.p.) was administered 30 min after scopolamine methyl chloride (1 mg/kg) injection at P7 to block the peripheral effect of pilocarpine. From P8 to P14, the animals in the Leptin group and RS+Leptin group were given leptin (4 mg/kg, i.p.). The Morris water maze test was performed during P28-P33. Following routine seizure threshold detection and Timm staining procedures, Western blot analysis was performed for each group. Pilocarpine-induced neonatal SE severely impaired learning and memory abilities, reduced seizure threshold, and induced aberrant hippocampal CA3 mossy fiber sprouting. In parallel, there was a significantly down-regulated protein level of CB-D28k and an up-regulated protein level of ZnT3 in the hippocampus of the RS group. Furthermore, leptin treatment soon after neonatal SE for seven consecutive days counteracted these hyperexcitability-related alterations. These novel findings established that leptin has a neuroprotective role in the model of cholinergic neonatal SE and highlights ZnT3/CB-D28k associated-Zn (2+)/Ca (2+) signaling as a promising therapeutic target.
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Affiliation(s)
- Hong Ni
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, No. 303, Jingde Road, 215003, Suzhou, PR China.
| | - Su-Hong Chen
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, No. 303, Jingde Road, 215003, Suzhou, PR China
| | - Li-Li Li
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, No. 303, Jingde Road, 215003, Suzhou, PR China
| | - Mei-Fang Jin
- Neurology Laboratory, Institute of Pediatric Research, Children's Hospital of Soochow University, No. 303, Jingde Road, 215003, Suzhou, PR China
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Li ZH, Li LL, Jin MF, Chen XQ, Sun Q, Ni H. Dysregulation of zinc/lipid metabolism‑associated genes in the rat hippocampus and cerebral cortex in early adulthood following recurrent neonatal seizures. Mol Med Rep 2017; 16:4701-4709. [PMID: 28791347 PMCID: PMC5647039 DOI: 10.3892/mmr.2017.7160] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 06/06/2017] [Indexed: 01/10/2023] Open
Abstract
Although it has been established that recurrent or prolonged clinical seizures during infancy may cause lifelong brain damage, the underlying molecular mechanism is still not well elucidated. The present study, to the best of our knowledge, is the first to investigate the expression of twenty zinc (Zn)/lipid metabolism-associated genes in the hippocampus and cerebral cortex of rats following recurrent neonatal seizures. In the current study, 6-day-old Sprague-Dawley rats were randomly divided into control (CONT) and recurrent neonatal seizure (RS) groups. On postnatal day 35 (P35), mossy fiber sprouting and gene expression were assessed by Timm staining and reverse transcription-quantitative polymerase chain reaction, respectively. Of the twenty genes investigated, seven were significantly downregulated, while four were significantly upregulated in the RS group compared with CONT rats, which was observed in the hippocampus but not in the cerebral cortex. Meanwhile, aberrant mossy fiber sprouting was observed in the supragranular region of the dentate gyrus and Cornu Ammonis 3 subfield of the hippocampus in the RS group. In addition, linear correlation analysis identified significant associations between the expression of certain genes in the hippocampus, which accounted for 40% of the total fifty-five gene pairs among the eleven regulated genes. However, only eight gene pairs in the cerebral cortex exhibited significant positive associations, which accounted for 14.5% of the total. The results of the present study indicated the importance of hippocampal Zn/lipid metabolism-associated genes in recurrent neonatal seizure-induced aberrant mossy fiber sprouting, which may aid the identification of novel potential targets during epileptogenesis.
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Affiliation(s)
- Zhen-Hong Li
- Neurology Laboratory, Institute of Pediatrics, Children's Hospital of Soochow University, Suzhou, Jiangsu 215003, P.R. China
| | - Li-Li Li
- Neurology Laboratory, Institute of Pediatrics, Children's Hospital of Soochow University, Suzhou, Jiangsu 215003, P.R. China
| | - Mei-Fang Jin
- Neurology Laboratory, Institute of Pediatrics, Children's Hospital of Soochow University, Suzhou, Jiangsu 215003, P.R. China
| | - Xu-Qin Chen
- Neurology Laboratory, Institute of Pediatrics, Children's Hospital of Soochow University, Suzhou, Jiangsu 215003, P.R. China
| | - Qi Sun
- Neurology Laboratory, Institute of Pediatrics, Children's Hospital of Soochow University, Suzhou, Jiangsu 215003, P.R. China
| | - Hong Ni
- Neurology Laboratory, Institute of Pediatrics, Children's Hospital of Soochow University, Suzhou, Jiangsu 215003, P.R. China
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Bao L, Li RH, Li M, Jin MF, Li G, Han X, Yang YY, Sun B, Xu LX, Feng X. Autophagy-regulated AMPAR subunit upregulation in in vitro oxygen glucose deprivation/reoxygenation-induced hippocampal injury. Brain Res 2017; 1668:65-71. [PMID: 28549968 DOI: 10.1016/j.brainres.2017.05.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 05/17/2017] [Accepted: 05/18/2017] [Indexed: 01/11/2023]
Abstract
Autophagy has been implicated to mediate experimental cerebral ischemia/reperfusion-induced neuronal death; the underlying molecular mechanisms, though, are poorly understood. In this study, we investigated the role of autophagy in regulating the expression of AMPAR subunits (GluR1, GluR2, and GluR3) in oxygen glucose deprivation/reperfusion (OGD/R)-mediated injury of hippocampal neurons. Our results showed that, OGD/R-induced hippocampal neuron injury was accompanied by accumulation of autophagosomes and autolysosomes in cytoplasm alongside a dramatic increase in expression of autophagy-related genes, LC3 and Beclin 1 and increased intracellular Ca2+ levels. Pre-treatment with autophagy inhibitor 3-methyladenine (3-MA) significantly reduced this effect. Moreover, the OGD/R-induced upregulation of mRNA and protein expressions of GluR1, GluR2, and GluR3 were also effectively reversed in cells pretreated with 3-MA. Our findings indicate that OGD/R induced the expression of GluRs by activating autophagy in in vitro cultured hippocampal neurons, which could be effectively reversed by the administration of 3-MA.
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Affiliation(s)
- Li Bao
- Department of Neonatology, People's Hospital of Yixing City, Jiangsu, China
| | - Rong-Hu Li
- Department of Neonatology, Children's Hospital of Jinan City, Jinan, China
| | - Mei Li
- Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
| | - Mei-Fang Jin
- Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
| | - Gang Li
- Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China
| | - Xing Han
- Department of Neonatology, Children's Hospital of Soochow University, Suzhou, China
| | - Yuan-Yuan Yang
- Department of Neonatology, Children's Hospital of Soochow University, Suzhou, China
| | - Bin Sun
- Department of Neonatology, Children's Hospital of Soochow University, Suzhou, China
| | - Li-Xiao Xu
- Institute of Pediatric Research, Children's Hospital of Soochow University, Suzhou, China.
| | - Xing Feng
- Department of Neonatology, Children's Hospital of Soochow University, Suzhou, China.
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Xu LX, Tang XJ, Yang YY, Li M, Jin MF, Miao P, Ding X, Wang Y, Li YH, Sun B, Feng X. Neuroprotective effects of autophagy inhibition on hippocampal glutamate receptor subunits after hypoxia-ischemia-induced brain damage in newborn rats. Neural Regen Res 2017; 12:417-424. [PMID: 28469656 PMCID: PMC5399719 DOI: 10.4103/1673-5374.202945] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Autophagy has been suggested to participate in the pathology of hypoxic-ischemic brain damage (HIBD). However, its regulatory role in HIBD remains unclear and was thus examined here using a rat model. To induce HIBD, the left common carotid artery was ligated in neonatal rats, and the rats were subjected to hypoxia for 2 hours. Some of these rats were intraperitoneally pretreated with the autophagy inhibitor 3-methyladenine (10 mM in 10 μL) or the autophagy stimulator rapamycin (1 g/kg) 1 hour before artery ligation. Our findings demonstrated that hypoxia-ischemia-induced hippocampal injury in neonatal rats was accompanied by increased expression levels of the autophagy-related proteins light chain 3 and Beclin-1 as well as of the AMPA receptor subunit GluR1, but by reduced expression of GluR2. Pretreatment with the autophagy inhibitor 3-methyladenine blocked hypoxia-ischemia-induced hippocampal injury, whereas pretreatment with the autophagy stimulator rapamycin significantly augmented hippocampal injury. Additionally, 3-methyladenine pretreatment blocked the hypoxia-ischemia-induced upregulation of GluR1 and downregulation of GluR2 in the hippocampus. By contrast, rapamycin further elevated hippocampal GluR1 levels and exacerbated decreased GluR2 expression levels in neonates with HIBD. Our results indicate that autophagy inhibition favors the prevention of HIBD in neonatal rats, at least in part, through normalizing GluR1 and GluR2 expression.
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Affiliation(s)
- Li-Xiao Xu
- Institute of Pediatric Research, Affiliated Children's Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Xiao-Juan Tang
- Department of Neonatology, Affiliated Children's Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Yuan-Yuan Yang
- Department of Neonatology, Affiliated Children's Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Mei Li
- Institute of Pediatric Research, Affiliated Children's Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Mei-Fang Jin
- Institute of Pediatric Research, Affiliated Children's Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Po Miao
- Department of Neonatology, Affiliated Children's Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Xin Ding
- Department of Neonatology, Affiliated Children's Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Ying Wang
- Department of Neonatology, Affiliated Children's Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Yan-Hong Li
- Department of Neonatology, Affiliated Children's Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Bin Sun
- Department of Neonatology, Affiliated Children's Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Xing Feng
- Department of Neonatology, Affiliated Children's Hospital of Soochow University, Suzhou, Jiangsu Province, China
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Li YF, Ma YL, Nie L, Chen S, Jin MF, Wang SL. [Establishment and validation of a neonatal pig model of hemolytic jaundice]. Zhongguo Dang Dai Er Ke Za Zhi 2016; 18:431-434. [PMID: 27165593 PMCID: PMC7390372 DOI: 10.7499/j.issn.1008-8830.2016.05.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 03/28/2016] [Indexed: 06/05/2023]
Abstract
OBJECTIVE To establish a neonatal pig model of hemolytic jaundice. METHODS Twelve seven-day-old purebred Yorkshire pigs were randomly divided into an experimental group and a control group (n=6 each). Immunization of New Zealand white rabbits was used to prepare rabbit anti-porcine red blood cell antibodies, and rabbit anti-porcine red blood cell serum was separated. The neonatal pigs in the experimental group were given an intravenous injection of rabbit anti-porcine red blood cell serum (5 mL), and those in the control group were given an intravenous injection of normal saline (5 mL). Venous blood samples were collected every 6 hours for routine blood test and liver function evaluation. RESULTS The experimental group had a significantly higher serum bilirubin level than the control group at 18 hours after the injection of rabbit anti-porcine red blood cell serum (64±30 μmol/L vs 20±4 μmol/L; P<0.05). In the experimental group, the serum bilirubin level reached the peak at 48 hours (275±31 μmol/L), and decreased significantly at 96 hours after the injection (95±17 μmol/L), but all significantly higher than that in the control group (P<0.05). At 18 hours after the injection, the experimental group had a significantly lower red blood cell (RBC) count than the control group [(4.58±0.32)×10(12)/L vs (5.09±0.44)×10(12)/L; P<0.05]; at 24 hours, the experimental group showed further reductions in RBC count and hemoglobin level and had significantly lower RBC count and hemoglobin level than the control group [RBC: (4.21±0.24)×10(12)/L vs (5.11±0.39)×10(12)/L, P<0.05; hemoglobin: 87±3 g vs 97±6 g, P<0.05]. The differences in RBC count and hemoglobin level between the two groups were largest at 36-48 hours. CONCLUSIONS The neonatal pig model of hemolytic jaundice simulates the pathological process of human hemolytic jaundice well and provides good biological and material bases for further investigation of neonatal hemolysis.
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Affiliation(s)
- Yong-Fu Li
- Department of Neonatology, Suzhou Municipal Hospital, Suzhou, Jiangsu 215002, China.
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11
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Tao YF, Xu LX, Lu J, Hu SY, Fang F, Cao L, Xiao PF, Du XJ, Sun LC, Li ZH, Wang NN, Su GH, Li YH, Li G, Zhao H, Li YP, Xu YY, Zhou HT, Wu Y, Jin MF, Liu L, Zhu XM, Ni J, Wang J, Xing F, Zhao WL, Pan J. Early B-cell factor 3 (EBF3) is a novel tumor suppressor gene with promoter hypermethylation in pediatric acute myeloid leukemia. J Exp Clin Cancer Res 2015; 34:4. [PMID: 25609158 PMCID: PMC4311429 DOI: 10.1186/s13046-014-0118-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 11/27/2014] [Indexed: 12/21/2022]
Abstract
Background Pediatric acute myeloid leukemia (AML) comprises up to 20% of all childhood leukemia. Recent research shows that aberrant DNA methylation patterning may play a role in leukemogenesis. The epigenetic silencing of the EBF3 locus is very frequent in glioblastoma. However, the expression profiles and molecular function of EBF3 in pediatric AML is still unclear. Methods Twelve human acute leukemia cell lines, 105 pediatric AML samples and 30 normal bone marrow/idiopathic thrombocytopenic purpura (NBM/ITP) control samples were analyzed. Transcriptional level of EBF3 was evaluated by semi-quantitative and real-time PCR. EBF3 methylation status was determined by methylation specific PCR (MSP) and bisulfite genomic sequencing (BGS). The molecular mechanism of EBF3 was investigated by apoptosis assays and PCR array analysis. Results EBF3 promoter was hypermethylated in 10/12 leukemia cell lines. Aberrant EBF3 methylation was observed in 42.9% (45/105) of the pediatric AML samples using MSP analysis, and the BGS results confirmed promoter methylation. EBF3 expression was decreased in the AML samples compared with control. Methylated samples revealed similar survival outcomes by Kaplan-Meier survival analysis. EBF3 overexpression significantly inhibited cell proliferation and increased apoptosis. Real-time PCR array analysis revealed 93 dysregulated genes possibly implicated in the apoptosis of EBF3-induced AML cells. Conclusion In this study, we firstly identified epigenetic inactivation of EBF3 in both AML cell lines and pediatric AML samples for the first time. Our findings also showed for the first time that transcriptional overexpression of EBF3 could inhibit proliferation and induce apoptosis in AML cells. We identified 93 dysregulated apoptosis-related genes in EBF3-overexpressing, including DCC, AIFM2 and DAPK1. Most of these genes have never been related with EBF3 over expression. These results may provide new insights into the molecular mechanism of EBF3-induced apoptosis; however, further research will be required to determine the underlying details. Our findings suggest that EBF3 may act as a putative tumor suppressor gene in pediatric AML.
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Affiliation(s)
- Yan-Fang Tao
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Li-Xiao Xu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Jun Lu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Shao-Yan Hu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Fang Fang
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Lan Cao
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Pei-Fang Xiao
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Xiao-Juan Du
- Department of Gastroenterology, the 5th Hospital of Chinese PLA, Yin chuan, China.
| | - Li-Chao Sun
- Department of Cell and Molecular Biology, Cancer Institute (Hospital), Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China.
| | - Zhi-Heng Li
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Na-Na Wang
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Guang-Hao Su
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Yan-Hong Li
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Gang Li
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - He Zhao
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Yi-Ping Li
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Yun-Yun Xu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Hui-Ting Zhou
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Yi Wu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Mei-Fang Jin
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Lin Liu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Xue-Ming Zhu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Jian Ni
- Translational Research Center, Second Hospital, The Second Clinical School, Nanjing Medical University, Nanjing, China.
| | - Jian Wang
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Feng Xing
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Wen-Li Zhao
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
| | - Jian Pan
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou, China.
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12
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Wang NN, Li ZH, Zhao H, Tao YF, Xu LX, Lu J, Cao L, Du XJ, Sun LC, Zhao WL, Xiao PF, Fang F, Su GH, Li YH, Li G, Li YP, Xu YY, Zhou HT, Wu Y, Jin MF, Liu L, Ni J, Wang J, Hu SY, Zhu XM, Feng X, Pan J. Molecular targeting of the oncoprotein PLK1 in pediatric acute myeloid leukemia: RO3280, a novel PLK1 inhibitor, induces apoptosis in leukemia cells. Int J Mol Sci 2015; 16:1266-92. [PMID: 25574601 PMCID: PMC4307303 DOI: 10.3390/ijms16011266] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 12/29/2014] [Indexed: 01/03/2023] Open
Abstract
Polo-like kinase 1 (PLK1) is highly expressed in many cancers and therefore a biomarker of transformation and potential target for the development of cancer-specific small molecule drugs. RO3280 was recently identified as a novel PLK1 inhibitor; however its therapeutic effects in leukemia treatment are still unknown. We found that the PLK1 protein was highly expressed in leukemia cell lines as well as 73.3% (11/15) of pediatric acute myeloid leukemia (AML) samples. PLK1 mRNA expression was significantly higher in AML samples compared with control samples (82.95 ± 110.28 vs. 6.36 ± 6.35; p < 0.001). Kaplan-Meier survival analysis revealed that shorter survival time correlated with high tumor PLK1 expression (p = 0.002). The 50% inhibitory concentration (IC50) of RO3280 for acute leukemia cells was between 74 and 797 nM. The IC50 of RO3280 in primary acute lymphocytic leukemia (ALL) and AML cells was between 35.49 and 110.76 nM and 52.80 and 147.50 nM, respectively. RO3280 induced apoptosis and cell cycle disorder in leukemia cells. RO3280 treatment regulated several apoptosis-associated genes. The regulation of DCC, CDKN1A, BTK, and SOCS2 was verified by western blot. These results provide insights into the potential use of RO3280 for AML therapy; however, the underlying mechanisms remain to be determined.
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Affiliation(s)
- Na-Na Wang
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Zhi-Heng Li
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - He Zhao
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Yan-Fang Tao
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Li-Xiao Xu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Jun Lu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Lan Cao
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Xiao-Juan Du
- Department of Gastroenterology, the 5th Hospital of Chinese People's Liberation Army (PLA), Yinchuan 750000, China.
| | - Li-Chao Sun
- Department of Cell and Molecular Biology, Cancer Institute (Hospital), Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100021, China.
| | - Wen-Li Zhao
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Pei-Fang Xiao
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Fang Fang
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Guang-Hao Su
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Yan-Hong Li
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Gang Li
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Yi-Ping Li
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Yun-Yun Xu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Hui-Ting Zhou
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Yi Wu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Mei-Fang Jin
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Lin Liu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Jian Ni
- Translational Research Center, Second Hospital, The Second Clinical School, Nanjing Medical University, Nanjing 210000, China.
| | - Jian Wang
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Shao-Yan Hu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Xue-Ming Zhu
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Xing Feng
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
| | - Jian Pan
- Department of Hematology and Oncology, Children's Hospital of Soochow University, Suzhou 215003, China.
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Yang F, Chen LQ, Jin MF, Zhou WW, Wu HY. [Impact of neonatal exposure to different doses of bisphenol A on puberty in female rats]. Zhongguo Dang Dai Er Ke Za Zhi 2014. [PMID: 25008887 DOI: 10.7499/j.issn.1008-8830.2014.07.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/22/2023]
Abstract
OBJECTIVE To evaluate the effects of neonatal exposure to different doses of bisphenol A (BPA) on the vaginal opening day (VOD), hypothalamic Kiss-1 mRNA expression, and ovarian estrogen receptor (ER) mRNA expression in female rats. METHODS Neonatal female Sprague-Dawley (SD) rats were randomly divided into six groups: blank control, vehicle, 17β-estradiol (17β-estradiol, E2, 10 μg/d), low-dose BPA [25 μg(kg·d)], medium-dose BPA [50 μg(kg·d)], and high-dose BPA groups [250 μg(kg·d)]. The rats were subcutaneously injected with respective agents on postnatal days 0-6. The VOD was recorded, and each rat was sacrificed on the same day. The hypothalamus and ovary were taken and weighed, and the organ coefficients of hypothalamus and ovary were calculated. The hypothalamic Kiss-1 mRNA expression and ovarian ERα and ERβ mRNA expression were measured by real-time PCR. RESULTS Compared with the control group, the E2 and medium- and high-dose BPA groups had advanced VOD, and the E2 group had significantly reduced hypothalamic Kiss-1 mRNA expression and ovarian ERβ mRNA expression (P<0.05). CONCLUSIONS Neonatal exposure to medium- and high-dose BPA[50 and 250 μg/(kg·d)] can induce precocious puberty in rats, but it may not result from the change in hypothalamic Kiss-1 mRNA expression. Neonatal exposure to low-dose BPA [25 μg/(kg·d)] does not induce precocious puberty in rats.
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Affiliation(s)
- Fan Yang
- Department of Endocrinology, Children's Hospital of Soochow University, Suzhou, Jiangsu 215003, China.
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14
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Zhang LY, Li Y, Jin MF. [Diagnostic values of neopterin and S100b for central nervous system infections in children]. Zhongguo Dang Dai Er Ke Za Zhi 2014; 16:380-383. [PMID: 24750834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
OBJECTIVE To study the diagnostic values of cerebrospinal concentrations of neopterin (NPT) and S100b for central nervous system infections in children. METHODS Enzyme-linked immunosorbent assay was used to determinate the cerebrospinal concentrations of NPT and S100b in children with central nervous system infections and control children. The two groups of children were compared in terms of the two indicators, and the diagnostic values of the two indicators were evaluated by ROC curve analysis. RESULTS Children with viral encephalitis had significantly increased cerebrospinal concentrations of NPT and S100b compared with the control group and children with purulent meningitis (P<0.01); there was no difference in the cerebrospinal concentration of NPT between children with purulent meningitis and the control group, while the concentration of S100b in the purulent meningitis group was significantly higher than in the control group (P<0.01). According to the ROC curves, S100b was more valuable than NPT in the diagnosis of viral encephalitis; when cerebrospinal concentration was more than 0.384 ng/mL, S100b had a sensitivity of 93.3% and a specificity of 97.9%; a combination of the two indicators had a higher diagnostic value for viral encephalitis, with a sensitivity of 96.7% and a specificity of 97.9%. CONCLUSIONS Both NPT and S100b have certain values in the diagnosis of central nervous system infections in children, and S100b is better than NPT.
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Affiliation(s)
- Li-Ya Zhang
- Children's Hospital Affiliated to Soochow University, Suzhou, Jiangsu 215003, China.
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15
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Li YF, Jin MF, Sun B, Feng X. [Changes of biological clock protein in neonatal rats with hypoxic-ischemic brain damage]. Zhongguo Dang Dai Er Ke Za Zhi 2013; 15:62-66. [PMID: 23336172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
OBJECTIVE To study the effects of biological clock protein on circadian disorders in hypoxic-ischemic brain damage (HIBD) by examining levels of CLOCK and BMAL1 proteins in the pineal gland of neonatal rats. METHODS Seventy-two 7-day-old Sprague-Dawley (SD) rats were randomly divided into sham-operated and HIBD groups. HIBD model was prepared according to the modified Levine method. Western blot analysis was used to measure the levels of CLOCK and BMAL1 in the pineal gland at 0, 2, 12, 24, 36 and 48 hours after operation. RESULTS Both CLOCK and BMAL levels in the pineal gland increased significantly 48 hours after HIBD compared with the sham-operated group (P<0.05). There were no significant differences in levels of CLOCK and BMAL proteins between the two groups at 0, 2, 12, 24 and 36 hours after operation (P>0.05). CONCLUSIONS Levels of CLOCK and BMAL1 proteins in the pineal gland of rats increase significantly 48 hours after HIBD, suggesting that both CLOCK and BMAL1 may be involved the regulatory mechanism of circadian disorders in rats with HIBD.
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Affiliation(s)
- Yong-Fu Li
- Department of Neonatology, Children's Hospital of Soochow University, Suzhou, Jiangsu, China
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16
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Jin MF, Zhu XM, Gu HY, Wang XD, Liu L, Zhang M, Li XW. Significance of expression of E-cadherin and β-catenin in juvenile colorectal polyps in children. Shijie Huaren Xiaohua Zazhi 2012; 20:3051-3056. [DOI: 10.11569/wcjd.v20.i31.3051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To detect the expression of E-cadherin and β-catenin mRNAs and proteins in human colorectal juvenile polyps (JP) in children.
METHODS: The expression of E-cadherin and β-catenin mRNAs and proteins in 22 juvenile colorectal polyp specimens and 8 normal colorectal specimens was assayed by real-time PCR and Western blot, respectively. Immunohistochemistry was used to determine the expression and localization of E-cadherin and β-catenin in 30 juvenile colorectal polyp specimens and 10 normal colorectal specimens.
RESULTS: Real-time PCR and Western blot analyses showed that the expression levels of E-cadherin mRNA and protein were significantly lower in juvenile colorectal polyps than in normal colorectal specimens (1.1526 ± 0.3801 vs 0.4094 ± 0.2305, P < 0.05; 0.6028 ± 0.1778 vs 0.3257 ± 0.1168, P < 0.05). Although there was no significant difference in the expression level of β-catenin mRNA between the two groups, the expression of β-catenin was significantly higher in juvenile colorectal polyps than in normal colorectal specimens (0.8010 ± 0.1380 vs 1.2064 ± 0.3587, P < 0.05). Immunohistochemistry indicates that E-cadherin expression was down-regulated in juvenile polyps compared with controls (102.5155 ± 25.2988 vs 53.5772 ± 15.3205, P < 0.05). Positive staining for E-cadherin was predominantly localized on the epithelial cell membrane. The expression of β-catenin was increased in juvenile polyp specimens (112.0805 ± 24 9572 vs 260.3554 ± 86.6987, P < 0.05), and the positive rates of membrane, cytoplasmic and nuclear staining in juvenile polyp tissue was significantly higher than those in normal control tissues.
CONCLUSION: Dysregulation of E-cadherin and β-catenin expression may be an important feature of juvenile colorectal polyps.
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Hou SG, Jin MF. Poly[(2,2'-bipyridine-κN,N')(μ(3)-2,4,6-trimethyl-isophthalato-κO,O:O:O,O)cadmium]. Acta Crystallogr Sect E Struct Rep Online 2012; 68:m84-5. [PMID: 22259378 PMCID: PMC3254344 DOI: 10.1107/s1600536811054183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Accepted: 12/16/2011] [Indexed: 11/10/2022]
Abstract
In the crystal structure of the polymeric title complex, [Cd(C11H10O4)(C10H8N2)]n, the CdII cation is chelated by one 2,2-bipyridine ligand and two carboxyl groups from two trimethylisophthalate (TMIPA) anions, and is further coordinated by one carboxylate O atom from a third TMIPA anion, forming a distorted pentagonal–bipyramidal geometry. Each TMIPA anion bridges three CdII cations, forming polymeric complex sheets parallel to (001). Weak C—H⋯O hydrogen bonding occurs between adjacent sheets.
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Affiliation(s)
- Shao-Gang Hou
- College of Chemical and Environmental Engineering, Anyang Institute of Technology, Anyang 455000, People's Republic of China
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18
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Zhou WF, Chen Q, Jin MF, Ji ZH, Zhang MZ, Li HM, Liu FJ, Ji W. The diagnostic accuracy of high-mobility group box 1 protein and twelve other markers in discriminating bacterial, viral and co-infected bronchial pneumonia in Han children. Microbiol Immunol 2011; 55:279-88. [PMID: 21223368 DOI: 10.1111/j.1348-0421.2011.00306.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Pneumonia in children is common and can lead to grave consequences if not addressed in a proper and timely manner. In the management of pneumonia, early identification of the causative infective agent is of obvious importance for treatment, as it allows selection of the appropriate antibiotics. However, such identification requires laboratory test results, which may not be immediately available. The aim of this study was to evaluate the accuracy and usefulness of 13 markers in differentiating between viral and bacterial pneumonia in Han children (34 healthy controls and 78 patients). It was found that WBC counts were more accurate in diagnosis of the type of agent responsible for infection than was the degree of expression of HMGB1. Among the 13 markers investigated, HMGB1 was the best at discriminating between co-infected (bacterium and virus) and single-infected (bacterium or virus) children with bronchial pneumonia. HMGB1 expression of less than 1.0256, excluded most co-infections (the negative predictive value was greater than 89.7%). Diagnosed sole viral pneumonia clinically overlapped with bacterial pneumonia, but bacterial pneumonia was more often associated with higher white blood cell (WBC) counts (WBC ≥ 13,000 cells/mm(3)). When the two marker readouts--HMGB1 < 1.0256 and WBC ≥ 13,000 cells/mm(3)--were combined, the positive predictive value for bacterial pneumonia alone was 92.3%. These findings can help clinicians discriminate between bronchial pneumonia caused by virus, bacterium or both with a high specificity.
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Affiliation(s)
- W F Zhou
- School of Radiology and Public Health, Soochow University, Suzhou 215123, China
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19
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Guo Z, Chen ZA, Yu XJ, Jin MF, Li W, Zhang W. [Subcellular localization and identification of hydrogenase isolated from the marine green alga Platymonas subcordiformis using immunoprecipitation and MALDI-TOF MS]. Sheng Wu Gong Cheng Xue Bao 2010; 23:297-302. [PMID: 17460905 DOI: 10.1016/s1872-2075(07)60027-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A marine unicellular green alga, Platymonas subcordiformis, was demonstrated to photobiologically produce hydrogen gas from seawater. The objective of this study was to localize and identify the hydrogenase isolated from P. subcordiformis. Adaptation in the presence of inhibitors of protein biosynthesis indicated that the hydrogenase was much more inhibited by cycloheximide than that by chloramphenicol. The result suggested that the hydrogenase isolated from P. subcordiformis is probably synthesized in cytoplasmic ribosomes. Both Western blot analysis and immunogold electron microscopy demonstrate that the P. subcordiformis hydrogenase is mainly located in the chloroplast stroma. The proteins that reacted specifically with the antibodies against the iron hydrogenase isolated from Chlamydomonas reinhardtii were concentrated by immunoprecipitation. The separated protein bands were cut out of the SDS-PAGE gel, in-gel digested by trypsin, and analyzed by Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS). Mascot was employed for analysis of the MALDI data using the public databases NCBInr. The hydrogenase isolated from P. subcordiformis was identified to be the Fe-hydrogenase.
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Affiliation(s)
- Zhen Guo
- Marine Bioproducts Engineering Group, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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20
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Zhu XM, Jin MF, Wang XD, Li Y, Li XZ. [Familial hemophagocytic lymphohistiocytosis complicated by thymic dysplasia: a case report]. Zhongguo Dang Dai Er Ke Za Zhi 2009; 11:939-940. [PMID: 20113668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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21
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Jin MF, Zhu BY. Ethyl 3-[2-( p-toluenesulfonamido)phenyl]acrylate. Acta Crystallogr Sect E Struct Rep Online 2009; 65:o2312. [PMID: 21577783 PMCID: PMC2970429 DOI: 10.1107/s1600536809034163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2009] [Accepted: 08/26/2009] [Indexed: 11/10/2022]
Abstract
In the title compound, C18H19NO4S, the two benzene rings form a dihedral angle of 52.2 (7)°. The crystal struture is stabilized by N—H⋯O hydrogen bonds, which link the molecules into dimers.
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Abstract
The commercial application of plant cell cultures is often hindered by the instability of secondary metabolite biosynthesis, where the metabolite yield fluctuates and decline dramatically over subcultures. This study proposed that such instability is due to the fluctuations of culture variables. To validate this hypothesis, the effects of the fluctuations of two culture variables (subculture cycle and inoculum size) on the biomass, anthocyanin biosynthesig, intracellular carbon, nitrogen and phosphate during continuous 10 subculture cycles were investigated. The subculture cycle was fluctuated for 12h in a 7 day cycle (6.5, 7 and 7.5 d), and the inoculum size was fluctuated by 20% on basis of 2.00 g (1.60, 2.00 and 2.40 g). It was found that all the measured culture parameters fluctuated over the 10 subculture cycles. The fluctuation in terms of inoculum sizes had a greater effect on the stability of anthocyanin biosynthesis in suspension cultures of V. vinifera. Among all the subculture conditions investigated, 7d-subculture cycle and 1.60 g-inoculum size was the best one to hold the relatively stable anthocyanin production. The anthocyanin yield presented a negative correlation with intracellular sucrose content or intracellular total phosphate content.
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Affiliation(s)
- Jun-Ge Qu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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23
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Qiu H, Guo XH, Mo JH, Jin MF, Wu SL, Chen HL. Expressions of polypeptide: N-acetylgalactosaminyltransferase in leukemia cell lines during 1,25-dihydroxyvitamin D3 induced differentiation. Glycoconj J 2006; 23:575-84. [PMID: 17006648 DOI: 10.1007/s10719-006-8095-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2005] [Revised: 02/28/2006] [Accepted: 03/01/2006] [Indexed: 10/24/2022]
Abstract
The effect of 1,25-dihydroxyvitamin D3 [1,25(OH)(2)D3] on two leukemia cell lines, K562 and SHI-1, and its relation to the expression of different subtypes of polypeptide: N-acetylgalactosaminyltransferase (pp-GalNAc-T) was studied. With morphological and cell flow-cytometric method, it was found that 1,25(OH)(2)D3 induced the differentiation of both leukemia cell lines toward monocytic lineage, but not affected the cell growth and apoptosis. The expressions of different subtypes of pp-GalNAc-T, the initial glycosyltransferase in O-glycan synthesis, were studied with RT-PCR before and after the treatment of different concentrations of 1,25(OH)(2)D3. Among fourteen subtypes of pp-GalNAc-T (T1 approximately T14), K562 cells obviously expressed pp-GalNAc-T2, T4, T5, T7 (T2 was the highest) and SHI-1 cells apparently expressed pp-GalNAcT1, T2, T3 and T4 (T4 was the highest) only. After K562 cells were treated 1, 25(OH)(2)D3 for 72 h, pp-GalNAc-T2, T4, T5, T7 were increased in a dose dependent manner. In contrast, pp-GalNAc-T1 and T2, especially T1, were up-regulated in SHI-1 cells by 1,25(OH)(2)D3, but T3 was unchanged and T4 was down-regulated. The different alterations of pp-GalNAc-Ts in these two cell lines were probably related to the different structural changes of O-glycans during 1,25(OH)(2)D3 induced differentiation.
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Affiliation(s)
- Hao Qiu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Institute of Bioengineering, Suzhou University, Suzhou, China
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24
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Abstract
The instability of secondary metabolite production is a ubiquitous problem in plant cell culture. To understand the instability, the investigation of anthocyanin accumulation in suspension cultures of Vitis vinifera, as a model system, has been initiated in our laboratory. Suspension culture of a relatively homogeneous cell line E of V. vinifera, was established by long-term cell line selection by anthocyanin content differentiation. The aggregate size of E was smaller than that of other cell lines obtained by routine screening method. The variation coefficients of anthocyanin content in suspension cultures of E were 8.7% in long-term subcultures and 5% in repeated flasks, respectively. The effects of elicitor, precursor feeding and light irridiation on biomass and anthocyanin accumulation in suspension cultures of E had been investigated and the results showed that all the variation coefficients were lower than 12% and this indicated the importance of homogeneity on stable production in plant cell culture. With the combination treatment of 30micromol/L phenylalanine and 218micromol/L methyl jasmonate in the dark in suspension cultures of E, the anthocyanin content and production in suspension culture of E was 5.89-fold and 4.30-fold of the controls, respectively, and all the variation coefficients of biomass and anthocyanin accumulation were lower than those of the controls in 5 successive subcultures.
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Affiliation(s)
- Jun-Ge Qu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, China
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25
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Qu JG, Yu XJ, Zhang W, Jin MF. [Significant improved anthocyanins biosynthesis in suspension cultures of Vitis vinifera by process intensification]. Sheng Wu Gong Cheng Xue Bao 2006; 22:299-305. [PMID: 16607960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The low-production is a ubiquitous problem and has prevented the commercialization of secondary metabolite production in plant cell culture. In order to examine the effective approaches to improvement of secondary metabolite production in plant cell culture, the investigation of anthocyanins accumulation in suspension cultures of Vitis vinifera, as a model system, had been initiated in our laboratory. In this present research, various elicitors and the precursor of phenylalanine were used in combination to enhance the anthocyanins production in suspension cultures of Vitis vinifera. And an integrated process with the combination of elicitation, precursor feeding and light irradiation was reported for rational bioprocess design. Among the combination treatment of phenylalanine feeding and several elicitors (methyl-beta-cyclodextrin, dextran T-40, methyl jasmonate, extracts of Aspergillus niger and Fusarium orthoceras), the combination with methyl jasmonate gave the highest anthocyanins production in suspension cultures of Vitis vinifera. When compared to the controls, the anthocyanins content (CV/g, FCW) and production (CV/L) increased by 2.7-fold and 3.4-fold, respectively. The optimum time for the addition of phenylalanine and methyl jasmonate was 4 days after inoculation. Two cell lines with different anthocyanins-producing capacity responded differently to the optimum combination treatment of 30 micromol/L phenylalanine feeding, 218 micromol/L methyl jasmonate elicitation and 3000 to approximately 4000 1x light illumination. The high-and low-anthocyanins-producing cell lines of VV05 and VV06 produced the maximum of 2975 and 4090 CV/L of anthocyanins that were 2.5- and 5.2-fold of the controls, respectively.
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Affiliation(s)
- Jun-Ge Qu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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26
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Abstract
Repeated-batch cultures of strawberry cells (Fragaria ananassa cv. Shikinari) subjected to four medium-shift procedures (constant LS medium, constant B5 medium, alternation between LS and B5 starting from LS and alternation between LS and B5 starting from B5) were investigated for the enhanced anthocyanin productivity. To determine the optimum period for repeated batch cultures, two medium-shift periods of 9 and 14 days were studied, which represent the end of the exponential growth phase and the stationary phase. By comparison with the corresponding batch cultures, higher anthocyanin productivity was achieved for all the repeated-batch cultures at a 9-day medium-shift period. The average anthocyanin productivity was enhanced 1.7- and 1.76-fold by repeated-batch cultures in constant LS and constant B5 medium at a 9-day shift period for 45 days, respectively. No further improvement was observed when the medium was alternated between LS (the growth medium) and B5 (the production medium). Anthocyanin production was unstable at a 14-day shift period regardless of the medium-shift procedures. The results show that it is feasible to improve anthocyanin production by a repeated-batch culture of strawberry cells.
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Affiliation(s)
- W Zhang
- Department of Biochemical Engineering, Dalian Institute of Chemical Physics, Chinese Academy of Sciences.
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27
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Xu KC, Yang DM, Jin MF. [Diagnostic value of a low-calorie test for Gilbert's disease]. Zhonghua Nei Ke Za Zhi 1986; 25:536-8, 575-6. [PMID: 3803070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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28
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Xu Z, Jin MF. Experimental and clinical experiences with peritoneo-venous shunt (locally made Z-CI device) in the treatment of intractable ascites. Acta Acad Med Wuhan 1983; 3:193-8. [PMID: 6646551 DOI: 10.1007/bf02856877] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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