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Liu FY, Feng XM, Ji XL, Su XL. [Cluster classification and clinical prognostic modeling based on m6A RNA methylation regulators in liver cancer]. Zhonghua Gan Zang Bing Za Zhi 2022; 30:962-969. [PMID: 36299190 DOI: 10.3760/cma.j.cn501113-20200727-00428] [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: 06/16/2023]
Abstract
Objective: Cluster classification based on m6A methylation regulators and construct prognostic evaluation model. Methods: Utilizing consensus cluster to classify the liver cancer samples form TCGA based on the expression of 13 m6A methylation regulators, and verify the function and prognostic significance of the clustered subtypes. Marker genes were further screened to construct a risk prediction model for evaluating the prognosis of liver cancer patients. Results: The two clustered subtypes based on m6A methylation regulators showed significant differences in the prognosis value of liver cancer patients (P=0.048), and 38 prognostic markers related to m6A methylation in liver cancer were screened from the subgroup with poor prognosis. Two m6A regulatory genes, YTHDF1 and YTHDF2, are proved with adverse prognosis by univariate cox analysis (P<0.05, Hazard ratio>1). We used Lasso regression method to build risk assessment model and effectively predicted the prognosis status of liver cancer patients within 4 years (4-year AUC=0.685, 3-year AUC=0.669). Moreover, the assessment model was validated in another dataset of Asia liver cancer patients. Conclusion: The study provided ideas for studying m6A methylation in liver cancer, and the risk prediction model can be used to evaluate the short-term prognosis of liver cancer patients.
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Affiliation(s)
- F Y Liu
- Clinical Medical Research Center, the Affiliated Hospital of Inner Mongolia Medical University, Hohhot 010010, China College of Life Sciences, Inner Mongolia University, Hohhot 010010, China Inner Mongolia Key Laboratory of Medical Cell Biology, Hohhot 010010, China
| | - X M Feng
- Clinical Medical Research Center, the Affiliated Hospital of Inner Mongolia Medical University, Hohhot 010010, China
| | - X L Ji
- Infectious Disease, the Affiliated Hospital of Inner Mongolia Medical University, Hohhot 010010, China
| | - X L Su
- Clinical Medical Research Center, the Affiliated Hospital of Inner Mongolia Medical University, Hohhot 010010, China Inner Mongolia Key Laboratory of Medical Cell Biology, Hohhot 010010, China
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Li XJ, Wang CM, Feng XM, Liu SW, Qiao HX, Chang YL, Sun CH. Planctomonas psychrotolerans sp. nov., isolated from rhizosphere soil of Suaeda salsa. Int J Syst Evol Microbiol 2020; 70:5271-5279. [PMID: 32833615 DOI: 10.1099/ijsem.0.004408] [Citation(s) in RCA: 4] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A psychrotolerant actinobacterium, designated strain J5903T, was isolated from an alkaline soil sample from the rhizosphere of Suaeda salsa collected in desertification land surrounding Jiuliancheng Nur in Hebei Province, PR China. Cells of the isolate were Gram-stain-positive, aerobic, non-motile and non-spore-forming cocci. Strain J5903T grew optimally at 20‒25 °C, at pH 7.0‒7.5 and with <1 % (w/v) NaCl. The cell-wall peptidoglycan type was B2γ with d-2,4-diaminobutyric acid and l-2,4-diaminobutyric acid as diagnostic amino acids. The muramyl residue was acetyl type. The menaquinones were MK-11, MK-12, MK-10 and MK-13. The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol and one unidentified glycolipid. The major whole-cell fatty acids were anteiso-C15 : 0, iso-C16 : 0 and anteiso-C17 : 0. The genomic DNA G+C content was 69.1 mol%. It shared the highest average nucleotide identity and digital DNA-DNA hybridization values with Planctomonas deserti 13S1-3T. Phylogenies based on genome sequence showed that strain J5903T and P. deserti 13S1-3T formed a robust cluster with high bootstrap support. Strain J5903T shared typical chemotaxonomic characteristics with P. deserti 13S1-3T. Combining the polyphasic taxonomic evidence, strain J5903T represents a novel species of the genus Planctomonas, for which the name Planctomonas psychrotolerans sp. nov. is proposed. The type strain is J5903T (=DSM 101894T=CGMCC 1.15523T).
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Affiliation(s)
- Xiao-Jun Li
- College of Lab Medicine, Hebei North University, Zhangjiakou 075000, PR China
| | - Chun-Miao Wang
- College of Lab Medicine, Hebei North University, Zhangjiakou 075000, PR China
| | - Xue-Mei Feng
- College of Lab Medicine, Hebei North University, Zhangjiakou 075000, PR China
| | - Shao-Wei Liu
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, PR China
| | - Hai-Xia Qiao
- College of Lab Medicine, Hebei North University, Zhangjiakou 075000, PR China
| | - Yue-Li Chang
- College of Lab Medicine, Hebei North University, Zhangjiakou 075000, PR China
| | - Cheng-Hang Sun
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, PR China
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Feng XM, Zhai XH, Liu SW, Wang CM, Sun CH, Zhou X, Zhang YJ, Li XJ. Phytoactinopolyspora mesophila sp. nov., isolated from a saline-alkaline soil. Int J Syst Evol Microbiol 2020; 70:4179-4185. [PMID: 32558636 DOI: 10.1099/ijsem.0.004274] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A novel moderately halophilic, filamentous actinobacterium, designated as XMNu-373T, was isolated from a saline-alkaline soil sample collected from the Mongolia Plateau, Dongwu County, Inner Mongolia Autonomous Region, PR China. The isolate grew optimally at 28‒37 °C, pH 7.0‒8.0 and with 2-5 % (w/v) NaCl. The substrate mycelia fragmented into rod-like elements, and the white aerial mycelia formed spore chains at maturity. The predominant menaquinone was MK-9(H4). The polar lipids were diphosphatidylglycerol, three unidentified phosphoglycolipids, an unidentified aminophospholipid, two phosphatidylinositol mannosides, four unidentified phospholipids, phosphatidylglycerol and two unidentified lipids. The major cellular fatty acids were iso-C16 : 0, anteiso-C17 : 0 and anteiso-C15 : 0. The genomic DNA G+C content was 66.2 mol%. It shared high 16S rRNA gene sequence similarities to Phytoactinopolyspora halotolerans YIM 96448T (96.1 %) and Phytoactinopolyspora endophytica EGI 60009T (96.0 %). Phylogenetic trees based on 16S rRNA gene sequences revealed that strain XMNu-373T resided in the clade of family Jiangellaceae, and it formed a monophyletic branch distinct from four other recognized type species in the subclade of the genus Phytoactinopolyspora. On the basis of polyphasic taxonomic evidence, strain XMNu-373T represents a novel species of the genus Phytoactinopolyspora, for which the name Phytoactinopolyspora mesophila sp. nov. is proposed. The type strain is XMNu-373T (=JCM 33740T=CGMCC 4.7654T).
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Affiliation(s)
- Xue-Mei Feng
- College of Lab Medicine, Hebei North University, Zhangjiakou 075000, PR China
| | - Xue-Han Zhai
- College of Lab Medicine, Hebei North University, Zhangjiakou 075000, PR China
| | - Shao-Wei Liu
- College of Lab Medicine, Hebei North University, Zhangjiakou 075000, PR China
| | - Chun-Miao Wang
- College of Lab Medicine, Hebei North University, Zhangjiakou 075000, PR China
| | - Cheng-Hang Sun
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, PR China
| | - Xue Zhou
- College of Lab Medicine, Hebei North University, Zhangjiakou 075000, PR China
| | - Ya-Jie Zhang
- College of Lab Medicine, Hebei North University, Zhangjiakou 075000, PR China
| | - Xiao-Jun Li
- College of Lab Medicine, Hebei North University, Zhangjiakou 075000, PR China
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Tang SZ, Liu YN, Hu SH, Chen H, Zhao H, Feng XM, Pan XJ, Chen P. Mutation analysis of FBN1 gene in two Chinese families with congenital ectopia lentis in northern China. Int J Ophthalmol 2019; 12:1674-1679. [PMID: 31741853 DOI: 10.18240/ijo.2019.11.02] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 06/12/2019] [Indexed: 01/27/2023] Open
Abstract
AIM To summarize the phenotypes and identify the underlying genetic cause of the fibrillin-1 (FBN1) gene responsible for congenital ectopia lentis (EL) in two Chinese families in northern China. METHODS A detailed family history and clinical data from all participants were collected by clinical examination. The candidate genes were captured and sequenced by targeted next-generation sequencing, and the results were confirmed by Sanger sequencing. Haplotyping was used to confirm the mutation sequence. Real-time PCR was used to determine the FBN1 messenger ribonucleic acid (mRNA) levels in patients with EL and in unaffected family members. RESULTS The probands and other patients in the two families were affected with congenital isolated EL. A heterozygous FBN1 mutation in exon 21 (c.2420_IVS20-8 delTCTGAAACAinsCGAAAG) was identified in FAMILY-1. A heterozygous FBN1 mutation in exon 14 (c.1633C>T, p.R545C) was identified in FAMILY-2. Each mutation co-segregated with the affected individuals in the family and did not exist in unaffected family members and 200 unrelated normal controls. CONCLUSION The insertion-deletion mutation (c.2420 IVS20-8delTCTGAAACA insCGAAAG) in the FBN1 gene is first identified in isolated EL. The mutation (c.1633C>T) in the FBN1 gene was a known mutation in EL patient. The variable phenotypes among the patients expand the phenotypic spectrum of EL in a different ethnic background.
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Affiliation(s)
- Su-Zhen Tang
- Department of Human Anatomy, Histology and Embryology, School of Basic Medicine, Qingdao University, Qingdao 266071, Shandong Province, China
| | - Ya-Ning Liu
- Department of Human Anatomy, Histology and Embryology, School of Basic Medicine, Qingdao University, Qingdao 266071, Shandong Province, China
| | - Shao-Hua Hu
- Department of Human Anatomy, Histology and Embryology, School of Basic Medicine, Qingdao University, Qingdao 266071, Shandong Province, China
| | - Hao Chen
- Department of Human Anatomy, Histology and Embryology, School of Basic Medicine, Qingdao University, Qingdao 266071, Shandong Province, China
| | - Hui Zhao
- The 971 Hospital of the Chinese People's Liberation Army Navy, Qingdao 266071, Shandong Province, China
| | - Xue-Mei Feng
- Department of Human Anatomy, Histology and Embryology, School of Basic Medicine, Qingdao University, Qingdao 266071, Shandong Province, China
| | - Xiao-Jing Pan
- Qingdao Eye Hospital, Shandong Eye Institute, Shandong First Medical University & Shandong Academy of Medical Sciences, Qingdao 266071, Shandong Province, China
| | - Peng Chen
- Department of Human Anatomy, Histology and Embryology, School of Basic Medicine, Qingdao University, Qingdao 266071, Shandong Province, China
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Hu HJ, Wang SS, Wang YX, Liu Y, Feng XM, Shen Y, Zhu L, Chen HZ, Song M. Blockade of the forward Na + /Ca 2+ exchanger suppresses the growth of glioblastoma cells through Ca 2+ -mediated cell death. Br J Pharmacol 2019; 176:2691-2707. [PMID: 31034096 PMCID: PMC6609550 DOI: 10.1111/bph.14692] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [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: 11/16/2018] [Revised: 04/16/2019] [Accepted: 04/17/2019] [Indexed: 01/13/2023] Open
Abstract
Background and Purpose The Na+/Ca2+ exchanger (NCX) working in either forward or reverse mode participates in maintaining intracellular Ca2+ ([Ca2+]i) homeostasis, which is essential for determining cell fate. Previously, numerous blockers targeting reverse or forward NCX have been developed and studied in ischaemic tissue injury but barely examined in glioblastoma for the purpose of anti‐tumour therapy. We assessed the effect of NCX blockers on glioblastoma growth and whether NCX can become a therapeutic target. Experimental Approach Patch‐clamp recording, Ca2+ imaging, flow cytometry, and Western blot were used to study the effects of specific and non‐specific NCX blockers on cultured glioblastoma cells. In vivo bioluminescent imaging was used to measure effects on grafted glioblastoma. Key Results Selectively blocking the reverse NCX with SEA0400, SN‐6, and YM‐244769 did not affect tumour cell viability. Blocking the forward NCX with bepridil, CB‐DMB, or KB‐R7943 elevated [Ca2+]i and killed glioblastoma cells. Bepridil and CB‐DMB caused Ca2+‐dependent cell cycle arrest together with apoptosis, which were all attenuated by a Ca2+ chelator BAPTA‐AM. Systemic administration of bepridil inhibited growth of brain‐grafted glioblastoma. Bepridil did not appear to have a cytotoxic effect on human astrocytes, which have higher functional expression of NCX than glioblastoma cells. Conclusions and Implications Low expression of the NCX makes glioblastoma cells sensitive to disturbance of [Ca2+]i. Interventions designed to block the forward NCX can cause Ca2+‐mediated injury to glioblastoma thus having therapeutic potential. Bepridil could be a lead compound for developing new anti‐tumour drugs.
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Affiliation(s)
- Hui-Jie Hu
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Shan-Shan Wang
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yan-Xia Wang
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yan Liu
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xue-Mei Feng
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ying Shen
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Liang Zhu
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Hong-Zhuan Chen
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Mingke Song
- Department of Pharmacology and Chemical Biology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Yang JJ, Gao Y, Wang YH, Wang CH, Wang LK, Tao BB, Guo HF, Ding SG, Wu AH, Zhai GR, Feng XM. The effect of leflunomide on the transplanted endometriosis lesions in SD rats. CLIN EXP OBSTET GYN 2017; 44:129-132. [PMID: 29714881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
OBJECTIVE To investigate the effects of the leflunomide (LEF) on the size of the transplanted endometriosis (EMS) lesions and trans- forming growth factor (TGF) -β1gray level in SD rats. MATERIALS AND METHODS EMS was surgically induced in rats by autologous trans- plantation and the focal volume was also measured. The rats were divided into three groups: group A: normal SD rats, group B: rats irrigated by one ml-kg⁻¹d⁻¹ saline for three weeks, and group C: rats irrigated by 35 mg-kg⁻¹d⁻¹ LEF for three weeks. The rats were then sacrificed and measured their focal volume and TGF-β1 gray value with immunohistochemical method. RESULTS The sizes of the focal volume in group C were significantly reduced compared to the rats before feeding, and the volume in group C was smaller than group B after feeding and so was the TGF-β1. CONCLUSION LEF could be a new therapeutic drug for EMS.
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Feng XM, Wang P, Yang W, Jin GR. High-precision evaluation of Wigner's d matrix by exact diagonalization. Phys Rev E Stat Nonlin Soft Matter Phys 2015; 92:043307. [PMID: 26565364 DOI: 10.1103/physreve.92.043307] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Indexed: 06/05/2023]
Abstract
The precise calculations of Wigner's d matrix are important in various research fields. Due to the presence of large numbers, direct calculations of the matrix using Wigner's formula suffer from a loss of precision. We present a simple method to avoid this problem by expanding the d matrix into a complex Fourier series and calculate the Fourier coefficients by exactly diagonalizing the angular momentum operator J(y) in the eigenbasis of J(z). This method allows us to compute the d matrix and its various derivatives for spins up to a few thousand. The precision of the d matrix from our method is about 10(-14) for spins up to 100.
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Affiliation(s)
- X M Feng
- Department of Physics, Beijing Jiaotong University, Beijing 100044, China
| | - P Wang
- Beijing Computational Science Research Center, Beijing 100084, China
- Department of Modern Physics, Hefei National Laboratory for Physics Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - W Yang
- Beijing Computational Science Research Center, Beijing 100084, China
| | - G R Jin
- Department of Physics, Beijing Jiaotong University, Beijing 100044, China
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Tan PP, Yuan HH, Zhu X, Cui YY, Li H, Feng XM, Qiu Y, Chen HZ, Zhou W. Activation of muscarinic receptors protects against retinal neurons damage and optic nerve degeneration in vitro and in vivo models. CNS Neurosci Ther 2013; 20:227-36. [PMID: 24279639 DOI: 10.1111/cns.12187] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [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: 05/30/2013] [Revised: 09/17/2013] [Accepted: 09/17/2013] [Indexed: 01/09/2023] Open
Abstract
AIMS Muscarinic acetylcholine receptor agonist pilocarpine reduces intraocular pressure (IOP) of glaucoma mainly by stimulating ciliary muscle contraction and then increasing aqueous outflow. It is of our great interest to know whether pilocarpine has the additional properties of retinal neuroprotection independent of IOP lowering in vitro and in vivo models. METHODS In rat primary retinal cultures, cell viability was measured using an MTT assay and the trypan blue exclusion method, respectively. Retinal ganglion cells (RGCs) were identified by immunofluorescence and quantified by flow cytometry. For the in vivo study, the retinal damage after retinal ischemia/reperfusion injury in rats was evaluated by histopathological study using hematoxylin and eosin staining, transmission electron microscopy, and immunohistochemical study on cleaved caspase-3, caspase-3, and ChAT. RESULTS Pretreatment of pilocarpine attenuated glutamate-induced neurotoxicity of primary retinal neurons in a dose-dependent manner. Protection of pilocarpine in both retinal neurons and RGCs was largely abolished by the nonselective muscarinic receptor antagonist atropine and the M1-selective muscarinic receptor antagonist pirenzepine. After ischemia/reperfusion injury in retina, the inner retinal degeneration occurred including ganglion cell layer thinning and neuron lost, and the optic nerve underwent vacuolar changes. These degenerative changes were significantly lessened by topical application of 2% pilocarpine. In addition, the protective effect of pilocarpine on the ischemic rat retina was favorably reflected by downregulating the expression of activated apoptosis marker cleaved caspase-3 and caspase-3 and upregulating the expression of cholinergic cell marker ChAT. CONCLUSIONS Taken together, this highlights pilocarpine through the activation of muscarinic receptors appear to afford significant protection against retinal neurons damage and optic nerve degeneration at clinically relevant concentrations. These data also further support muscarinic receptors as potential therapeutic neuroprotective targets in glaucoma.
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Affiliation(s)
- Pan-Pan Tan
- Department of Pharmacology, Institute of Medical Sciences, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Shi SY, Feng XM, Li Y, Li X, Chen XL. Expression of neuroglobin in ocular hypertension induced acute hypoxic-ischemic retinal injury in rats. Int J Ophthalmol 2011; 4:393-5. [PMID: 22553688 DOI: 10.3980/j.issn.2222-3959.2011.04.14] [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] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Accepted: 06/28/2011] [Indexed: 11/02/2022] Open
Abstract
AIM To investigate the expression of neuroglobin (Ngb) in the retina of rats with ocular hypertension induced acute retinal hypoxic-ischemic injury. METHODS Seventy Wistar rats were divided into 7 groups randomly. The experimental model was induced by elevation of intraocular pressure via anterior chamber canula insertion in the left eyes and the fellow eyes were preserved as normal controls. The retinal tissues were taken at 1, 5, 10, 15, 20, 30 and 60 minutes after hypoxic-ischemia injury. Protein was extracted, and then analyzed by Western-blot method. SPSS was used for statistical analysis. RESULTS The time-depended expressions of Ngb were observed. The level of Ngb increased rapidly at 1 minute after ischemia and reached to the peak at 5 minutes, which had significant difference from that of control group (P<0.05). It kept in high level during 5-15 minutes (P<0.05), then decreased after 20 minutes till 60 minutes. There were no significant differences between experimental and control group in the latter period (P>0.05). CONCLUSION The expression of Ngb in retinal tissue increased rapidly after hypoxic-ischemic injury in rats, suggesting that Ngb may play an important role in the process of acute retinal hypoxic-ischemic injury.
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Affiliation(s)
- Shao-Yang Shi
- Department of Ophthalmology, Shengjing Hospital of China Medical University, Shenyang 11004, Liaoning Province, China
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Fu J, Fang C, Cui YY, Yang LM, Zhu L, Feng XM, Zheng PL, Lu Y, Chen HZ. Quantitative determination of a novel enantiomeric tropane analog, (-)-satropane, in biological fluids using liquid chromatography/tandem mass spectrometry. Biomed Chromatogr 2009; 23:1044-50. [PMID: 19382243 DOI: 10.1002/bmc.1220] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A sensitive, accurate and precise liquid chromatography-tandem mass spectrometry method was developed for the determination of (-)-satropane (3alpha-paramethyl-benzenesulfonyloxy-6beta-acetoxy-tropane) in rabbit aqueous humor. Since (-)-satropane may be absorbed from the aqueous humour with resultant systemic side effects, the LC-MS/MS method was also evaluated for its applicability in analyzing plasma samples containing this compound. (-)-Satropane and phentolamine (the internal standard, represented as IS) were detected by multiple reaction monitoring using the transitions m/z 354-182 and 282-212, respectively. The calibration curve was linear over the ranges 2-500 and 5-1000 ng/mL, and the values of the lower limit of quantification were 2 and 5 ng/mL for the microdialysis dialysate and rat plasma samples, respectively. The intra-day and inter-day precision and accuracy were better than 8.6 and 6.00%, respectively, in both matrices investigated. The absolute recovery of the plasma samples was more than 76.30%. The average matrix effects of (-)-satropane were 91.72 and 83.05% in the microdialysis dialysate and plasma samples, respectively. The validated method was successfully applied to analyze (-)-satropane in microdialysis dialysate and rat plasma samples, and this assay has been used to quantify (-)-satropane in the pharmacokinetic and toxicokinetic studies in our laboratory.
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Affiliation(s)
- Jun Fu
- Institute of Drug Research, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, People's Republic of China
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Abstract
AIMS To develop a fast, accurate, objective and nondestructive method for monitoring barley tempeh fermentation. METHODS AND RESULTS Barley tempeh is a food made from pearled barley grains fermented with Rhizopus oligosporus. Rhizopus oligosporus growth is important for tempeh quality, but quantifying its growth is difficult and laborious. A system was developed for analysing digital images of fermentation stages using two image processing methods. The first employed statistical measures sensitive to image colour and surface structure, and these statistical measures were highly correlated (r=0.92, n=75, P<0.001) with ergosterol content of tempeh fermented with R. oligosporus and lactic acid bacteria (LAB). In the second method, an image-processing algorithm optimized to changes in images of final tempeh products was developed to measure number of visible barley grains. A threshold of 5 visible grains per Petri dish indicated complete tempeh fermentation. When images of tempeh cakes fermented with different inoculation levels of R. oligosporus were analysed the results from the two image processing methods were in good agreement. CONCLUSION Image processing proved suitable for monitoring barley tempeh fermentation. The method avoids sampling, is nonintrusive, and only requires a digital camera with good resolution and image analysis software. SIGNIFICANCE AND IMPACT OF THE STUDY The system provides a rapid visualization of tempeh product maturation and qualities during fermentation. Automated online monitoring of tempeh fermentation by coupling automated image acquisition with image processing software could be further developed for process control.
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Affiliation(s)
- X M Feng
- Department of Microbiology, Swedish University of Agricultural Sciences (SLU), Uppsala, Sweden.
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Abstract
Medical Polyacrylamide Hydrogel (PAMG)has been used in plastic and aesthetic surgery for years. However, its safety is still in doubt in many countries. In the current research, first an approach, using high performance liquid chromatography (HPLC), to determine the amount of residual acrylamide monomer (AM) in the PAMG was presented. Then the cytotoxicity of PAMG was investigated using cell counting and methyl thiazolyl tetrazolium (MTT) assay. To explore the mechanism of this toxicity, normal human fibroblasts cultured in medium extracts were analyzed. Membrane changes and other related parameters were investigated using flow cytometry (FCM). Real time fluorescent polymerase chain reaction (real time PCR) was also introduced to determine the biological response of the fibroblasts. During this process, three representative genes (p53, beta-actin, and c-myc, which are tumor suppressor genes, housekeeping genes, and proto-oncogenes respectively) were selected for examination. Results indicated that a method based on HPLC is practical and simple for determining AM in PAMG. The detection limits can reach the desired ppb level, and so it can fully meet the requirements of the studies of PAMG. Polyacylamide Hydrogel inhibits the growth of human fibroblasts and may cause the apoptosis of human fibroblasts. Moreover, it can alter physical parameters such as the size and the granularity of these cells. Furthermore, these three genes have a relatively typical amplification plot and highly related, wide-range standard curves, and so this reaction system is definitely suitable for the semiquantification of these genes. PAMG induces the increase of the message ribonucleic acid (mRNA) expression of c-myc, while the p53 and beta-actin remain even. This change is not related to the concentration of AM in the gel and may be incited by other components in the extract of PMAG.
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Affiliation(s)
- T F Xi
- Center for Medical Devices, National Institute for the Control of Pharmaceutical and Biological Products, Beijing 100050, People's Republic of China.
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Feng XM, Han XF, Wang XL. [Detection of Cysticercus cellulosae using PCR and DIG-labelled DNA probe]. Zhongguo Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi 2003; 19:54-5. [PMID: 12572027] [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: 02/28/2023]
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Chen RS, Liu CB, Lin XS, Feng XM, Zhu JM, Ye FQ. Supracondylar extension fracture of the humerus in children. Manipulative reduction, immobilisation and fixation using a U-shaped plaster slab with the elbow in full extension. J Bone Joint Surg Br 2001; 83:883-7. [PMID: 11521934 DOI: 10.1302/0301-620x.83b6.11705] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We present a method of manipulative reduction, immobilisation and fixation using a U-shaped plaster with the elbow in extension for extension-type supracondylar fractures of the humerus in children. When the elbow is in full extension, both the extensor and the flexor muscles are neutralised during manipulative reduction and the carrying angle can be easily assessed thus preventing cubitus varus, the most common complication. In order to evaluate the efficiency of this method, we compared the clinical results of the new method with those of conventional treatment. In a group of 95 children who sustained an extension-type supracondylar fracture of the humerus, 49 were treated by the new method and 46 by the conventional method, reduction and immobilisation in a plaster slab with the elbow in flexion. Reduction and immobilisation were easily achieved and reliably maintained by one manipulation for all the children treated by the new method. In 12 children treated by the conventional method, the initial reduction failed and in seven secondary displacement of the distal fragment occurred during the period of immobilisation in plaster. All required a second or third manipulation. Of the 46 children, 28 (60.9%) had developed cubitus varus at a mean follow-up of 4.6 years when treated by the conventional method. None of the children treated by the new method developed cubitus varus. The mean score, according to the Hospital for Special Surgery (HSS) elbow scoring system, was 91 points using the new method and 78 with the conventional method. The results were statistically significant with regard to the incidence of cubitus varus and the elbow score (p < 0.01) suggesting that the new method is reliable and gives a satisfactory outcome.
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Affiliation(s)
- R S Chen
- Department of Orthopaedic Surgery, Baonan District People's Hospital, Shenzhen, People's Republic of China
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15
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Isashiki Y, Feng XM, Ohba N, Ozawa T, Izumo S. A novel AvaI polymorphism within exon 5 of the rhodopsin gene. Jpn J Hum Genet 1996; 41:221-3. [PMID: 8914639 DOI: 10.1007/bf01892631] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We identified a novel AvaI polymorphism within 3' non-coding region within exon 5 of the human rhodopsin gene and determined the allele frequency in a Japanese population. The polymorphism was found to be due to A/G transversion at nucleotide 5510 of the gene.
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Affiliation(s)
- Y Isashiki
- Division of Molecular Pathology and Genetic Epidemiology, Kagoshima University Faculty of Medicine, Japan
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16
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Yao ZQ, Zhou YX, Guo J, Feng ZH, Feng XM, Chen CX, Jiao JZ, Wang SQ. Inhibition of hepatitis B virus in vitro by antisense oligonucleotides. Acta Virol 1996; 40:35-9. [PMID: 8886096] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A series of antisense phosphorothioate oligodeoxynucleotides against hepatitis B virus (HBV) were synthesized and evaluated for their antiviral effect in Hep-G2 cells transfected with HBV genome. The inhibitory effect of the tested antisense oligonucleotides was sequence-specific, dose-and time-dependent, and synergistic for certain combinations. In virus-inhibitory concentrations the oligonucleotides were harmless to 2.2.15 cells. The most effective antisense oligonucleotides were found directed against the HBV mRNA transcribed from the cap site of SP II promoter, the portion of polyadenylation signal and the initiation region of gene S, with an inhibition of the HBsAg and HBeAg production by 85-95% and 50- 60%, respectively. To our surprise, antisense oligonucleotides directed against three key sites of HBV X gene blocked the expression of HBsAg, HBeAg and HBxAg. This fact might be related to the trans-activation of HBV X protein. Using radioisotope labelling, we demonstrated that Lipofectin promoted the cellular uptake and antiviral effect of antisense oligomers in 2.2.15 cells. These results suggest a therapeutic potential of antisense oligonucleotides in the treatment of patients chronically infected with HBV.
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Affiliation(s)
- Z Q Yao
- Department of Infectious Diseases, Tangdu Hospital, Fourth Military Medical University, Xi'an, P.R. of China
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17
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Yao ZQ, Zhou YX, Feng XM, Chen ZX. Specific inhibition of hepatitis b virus gene expression by an antisense oligonucleotide in vitro. Acta Virol 1995; 39:227-230. [PMID: 8825305] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
It was previously shown that a number of antisense oligonucleotides against hepatitis B virus (HBV) mRNAs were highly effective in inhibition of HBV gene expression (Yao et al., 1995). Here, using radioisotope techniques, we report a specific inhibition of HBV surface antigen (HBsAg) production in vitro by 2.2.15 cells (Hep-G2 cells transfected with HBV genome) by the antisense oligonucleotide 15-S-asON, a 15-mer phosphorothioate analogue complementary to the cap site of the SPII promoter of HBV mRNA, at a concentration of 2-5 mumol/l. After 24 and 48 hrs of incubation of cells with 15-S-asON, the intracellular concentration of the latter rose to 69.4 and 75.8 nmol/l, respectively, and the HBsAg level assayed by ELISA was reduced by 50.0% and 70.6%, respectively. These results were checked by use of the radioimmunoprecipitation method: 2.2.15 cells exposed to 15-S-asON and labelled with [35S]-methionine for 48 hrs showed a decrease of the HBsAg level by 81.26% but almost none of the total proteins. No cytotoxicity of the 15-S-asON was observed with regard to the cell morphology and growth. These results indicate that the tested antisense oligonucleotide specifically inhibits the HBV gene expression.
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Affiliation(s)
- Z Q Yao
- Department of Infectious Diseases, Fourth Military Medical University, Xi'an, P.R. of China
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18
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Feng XM. [Treatment of infected wound with oxygen by oxygen tent]. Zhonghua Hu Li Za Zhi 1993; 28:648-50. [PMID: 8124775] [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: 01/28/2023]
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19
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Feng XM, Pu SY, Yang YZ. [Clinical significance of the spontaneous change in serum viral antibody titers in patients with acute Coxsackie B virus myocarditis]. Zhonghua Nei Ke Za Zhi 1988; 27:466-8, 517-8. [PMID: 2851423] [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: 01/02/2023]
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20
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Feng XM. [Incidence of viral carditis in epidemic influenza]. Zhonghua Xin Xue Guan Bing Za Zhi 1984; 12:177-9. [PMID: 6099799] [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: 01/18/2023]
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