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Li A, Xiong S, Li J, Mallik S, Liu Y, Fei R, Zhou H, Liu G. AngClust: Angle Feature-Based Clustering for Short Time Series Gene Expression Profiles. IEEE/ACM Trans Comput Biol Bioinform 2023; 20:1574-1580. [PMID: 35853049 DOI: 10.1109/tcbb.2022.3192306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
When clustering gene expression, it is expected that correlation coefficients of genes in the same clusters are high, and that gene ontology (GO) enrichment analysis of most clusters will be significant. However, existing short-term gene expression clustering algorithms have limitations. To address this problem, we proposed a novel clustering process based on angular features for short-term gene expression. Our method (named AngClust) uses angular features to indicate the change of trend in gene expression levels at two neighboring time points. The changes of angles at multiple time points reflects the change of trend of the overall expression levels. Such changes are used to measure whether the expression trends of different genes are similar. To obtain functionally significant clusters from the clustering results, we evaluated numbers of genes in clusters, average correlation coefficient, fluctuation, and their correlation with GO term enrichment. The efficacy of AngClust outperform two other measures, Euclidean distance (ED) and dynamic time warping of correlation (DTW), on a dataset of yeast gene expression. The ratios of GO and pathway term-enriched of clusters of AngClust is higher than or equal to that of STEM and TMixClust on human, mouse, and yeast time series of gene expression.
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Li A, Jia P, Mallik S, Fei R, Yoshioka H, Suzuki A, Iwata J, Zhao Z. Critical microRNAs and regulatory motifs in cleft palate identified by a conserved miRNA-TF-gene network approach in humans and mice. Brief Bioinform 2021; 21:1465-1478. [PMID: 31589286 DOI: 10.1093/bib/bbz082] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [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: 04/12/2019] [Revised: 06/03/2019] [Accepted: 06/12/2019] [Indexed: 12/12/2022] Open
Abstract
Cleft palate (CP) is the second most common congenital birth defect. The etiology of CP is complicated, with involvement of various genetic and environmental factors. To investigate the gene regulatory mechanisms, we designed a powerful regulatory analytical approach to identify the conserved regulatory networks in humans and mice, from which we identified critical microRNAs (miRNAs), target genes and regulatory motifs (miRNA-TF-gene) related to CP. Using our manually curated genes and miRNAs with evidence in CP in humans and mice, we constructed miRNA and transcription factor (TF) co-regulation networks for both humans and mice. A consensus regulatory loop (miR17/miR20a-FOXE1-PDGFRA) and eight miRNAs (miR-140, miR-17, miR-18a, miR-19a, miR-19b, miR-20a, miR-451a and miR-92a) were discovered in both humans and mice. The role of miR-140, which had the strongest association with CP, was investigated in both human and mouse palate cells. The overexpression of miR-140-5p, but not miR-140-3p, significantly inhibited cell proliferation. We further examined whether miR-140 overexpression could suppress the expression of its predicted target genes (BMP2, FGF9, PAX9 and PDGFRA). Our results indicated that miR-140-5p overexpression suppressed the expression of BMP2 and FGF9 in cultured human palate cells and Fgf9 and Pdgfra in cultured mouse palate cells. In summary, our conserved miRNA-TF-gene regulatory network approach is effective in detecting consensus miRNAs, motifs, and regulatory mechanisms in human and mouse CP.
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Affiliation(s)
- Aimin Li
- Center for Precision Health, School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA.,Shaanxi Key Laboratory for Network Computing and Security Technology, School of Computer Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi, 710048, China
| | - Peilin Jia
- Center for Precision Health, School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Saurav Mallik
- Center for Precision Health, School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA
| | - Rong Fei
- Shaanxi Key Laboratory for Network Computing and Security Technology, School of Computer Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi, 710048, China
| | - Hiroki Yoshioka
- Department of Diagnostic and Biomedical Sciences, School of Dentistry, The University of Texas Health Science Center at Houston, Houston, TX 77054, USA.,Center for Craniofacial Research, University of Texas Health Science Center at Houston, Houston, TX 77054, USA
| | - Akiko Suzuki
- Department of Diagnostic and Biomedical Sciences, School of Dentistry, The University of Texas Health Science Center at Houston, Houston, TX 77054, USA.,Center for Craniofacial Research, University of Texas Health Science Center at Houston, Houston, TX 77054, USA
| | - Junichi Iwata
- Department of Diagnostic and Biomedical Sciences, School of Dentistry, The University of Texas Health Science Center at Houston, Houston, TX 77054, USA.,Center for Craniofacial Research, University of Texas Health Science Center at Houston, Houston, TX 77054, USA.,MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, TX 77030, USA
| | - Zhongming Zhao
- Center for Precision Health, School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, TX 77030, USA.,MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, TX 77030, USA.,Department of Biomedical Informatics, Vanderbilt University Medical Center, Nashville, TN 37203, USA
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Affiliation(s)
- Rong Fei
- Xi’an University of Technology, Xi’an City, Shan Xi Province, China
| | - Shasha Li
- Xi’an University of Technology, Xi’an City, Shan Xi Province, China
| | - Xinhong Hei
- Xi’an University of Technology, Xi’an City, Shan Xi Province, China
| | - Qingzheng Xu
- College of Information and Communication, National University of Defense, China
| | - Jiayu Zhao
- Xi’an University of Technology, Xi’an City, Shan Xi Province, China
| | - Yuling Guo
- Xi’an University of Technology, Xi’an City, Shan Xi Province, China
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Wang N, Xu Q, Fei R, Yang J, Wang L. Rigorous Analysis of Multi-Factorial Evolutionary Algorithm as Multi-Population Evolution Model. INT J COMPUT INT SYS 2019. [DOI: 10.2991/ijcis.d.191004.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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Rao H, Wu E, Fu S, Yang M, Feng B, Lin A, Fei R, Fontana RJ, Lok AS, Wei L. The higher prevalence of truncal obesity and diabetes in American than Chinese patients with chronic hepatitis C might contribute to more rapid progression to advanced liver disease. Aliment Pharmacol Ther 2017; 46:731-740. [PMID: 28833342 DOI: 10.1111/apt.14273] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 05/03/2017] [Accepted: 07/27/2017] [Indexed: 12/12/2022]
Abstract
BACKGROUND Chronic hepatitis C virus (HCV) infection is the leading cause of cirrhosis and hepatocellular carcinoma (HCC) in the United States (US) and an emerging cause in China. AIM To compare the clinical characteristics of hepatitis C patients in the US and China, and factors influencing disease stage. METHODS Prospective study of 2 cohorts of HCV patients recruited at 1 site in the US and 3 sites in China. Standardised questionnaire on risk factors and medical history were used and diagnosis of cirrhosis and HCC was based on pre-defined criteria. RESULTS One thousand nine hundred and fifty seven patients (1000 US and 957 China) were enrolled. US patients were more likely to be men (61.4% vs 48.5%), older (median age 57 vs 53 years), obese (38.4% vs 16.8%) and diabetic (21.8% vs 10.8%). A significantly higher per cent of US patients had cirrhosis (38.2% vs 16.0%) and HCC (14.1% vs 2.7%). Investigator estimated time at infection in US was 10 years earlier than in Chinese patients but US patients were more likely to have advanced disease even after stratifying for duration of infection. Study site in the US, older age, truncal obesity, diabetes and prior HCV treatment were significant predictors of advanced disease on multivariate analysis. CONCLUSIONS HCV patients in the US had more advanced liver disease than those in China. We speculate that underlying fatty liver disease may be a major contributor to this difference, and management of glycometabolic abnormalities should occur in parallel with anti-viral therapy to achieve optimal outcomes.
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Affiliation(s)
- H Rao
- Peking University Hepatology Institute, Peking University People's Hospital, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Diseases, Beijing, China
| | - E Wu
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of Michigan Health System, Ann Arbor, MI, USA
| | - S Fu
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of Michigan Health System, Ann Arbor, MI, USA
| | - M Yang
- Peking University Hepatology Institute, Peking University People's Hospital, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Diseases, Beijing, China
| | - B Feng
- Peking University Hepatology Institute, Peking University People's Hospital, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Diseases, Beijing, China
| | - A Lin
- The Molecular and Behavioral Neuroscience Institute, University of Michigan, Ann Arbor, MI, USA
| | - R Fei
- Peking University Hepatology Institute, Peking University People's Hospital, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Diseases, Beijing, China
| | - R J Fontana
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of Michigan Health System, Ann Arbor, MI, USA
| | - A S Lok
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, University of Michigan Health System, Ann Arbor, MI, USA
| | - L Wei
- Peking University Hepatology Institute, Peking University People's Hospital, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Diseases, Beijing, China
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Wang JH, Wang XY, Fei R, Zhang HY, Wei L. [Tetracycline-inducible replications of wild-type and an adefovir-dipivoxil-resistant hepatitis B virus in human liver cells]. Zhonghua Yu Fang Yi Xue Za Zhi 2017; 50:351-6. [PMID: 27029368 DOI: 10.3760/cma.j.issn.0253-9624.2016.04.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVE To establish cell lines with inducible replications of wild-type or rtE218G, an adefovir-dipivoxil-resistant HBV mutant. METHODS Tetracycline transactivator (tTA) was stably transfected into human liver cell line HepG2.1.2 folds of full-length of wild-type or rtE218G-mutated HBV genomes were cloned into the pTRE vector and cotransfected into the tTA-expressing cells with a linear selection marker for hygromycin, respectively. After hygromycin screening, clones with the highest levels of tetracycline-inducible HBV replications were selected. The obtained cell lines were further used to evaluate the in vitro sensitivity of rtE218G mutant to adefovir-dipivoxil. RESULTS HepG2-off23, a HepG2-derived cell line with stable tTA expression was established. PTRE-based plasmids carrying wild-type HBV (pTRE-HBV-WT) or rtE218G mutant (pTRE-HBV-E218GHBV) were constructed. After stable transfection of the HBV constructs into HepG2-off23 cells, cell lines with robust and tetracycline-inducible replications of wild-type HBV (HepG2-tetHBV-WT) and rtE218G-mutated HBV (HepG2-tetHBV-E218G) were selected. In the two cell lines, high levels of viral core protein and DNA replication could be detected after 144 hours of culture, which could be potently inhibited when tetracycline was added into the medium. At the presence of 1 000 ng/ml of tetracycline, HBV replication intermediates were hardly detected by Southern blotting experiments. HBV mutant with rtE218G could independently confer resistance to adefovir in vitro. IC50 for HBV rtE218G mutant of adefovir was (6.49±0.09) μmol/L, which was significantly higher than that for wild type virus (2.49±0.05) μmol/L. CONCLUSION Wild-type and the rtE218G HBV mutant could be expressed and efficiently regulated by tetracycline in the established new cell lines. These cell lines could be useful tools for the HBV virology and anti-HBV drug screening studies.
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Affiliation(s)
- J H Wang
- Peking University People's Hospital, Peking University Hepatology Institute, Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Diseases, Beijing 100044, China
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Yang D, Fei R, Yao J, Gong M. Two-stage SAR image segmentation framework with an efficient union filter and multi-objective kernel clustering. Appl Soft Comput 2016. [DOI: 10.1016/j.asoc.2016.01.055] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Fei R, Chen W, Xiang T, Sheng Q, Wang J, Liu F. A modified two-stage perineal rectosigmoidectomy for incarcerated rectal prolapse. Tech Coloproctol 2013; 18:513-4. [PMID: 23525965 DOI: 10.1007/s10151-013-0996-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Accepted: 02/25/2013] [Indexed: 10/27/2022]
Affiliation(s)
- R Fei
- Department of Anorectal Surgery, The First Affiliated Hospital of Medical School of Zhejiang University, 79, Qingchun Road, Hangzhou, Zhejiang, China
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Du J, Ma M, Zhao Q, Fang L, Chang J, Wang Y, Fei R, Song X. Mitochondrial bioenergetic deficits in the hippocampi of rats with chronic ischemia-induced vascular dementia. Neuroscience 2012; 231:345-52. [PMID: 23232258 DOI: 10.1016/j.neuroscience.2012.11.062] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Revised: 11/18/2012] [Accepted: 11/29/2012] [Indexed: 12/01/2022]
Abstract
Vascular dementia (VD), defined as a loss of memory and cognitive function resulting from vascular lesions in the brain, is the second-most-common cause of dementia in the elderly, after Alzheimer's disease. In recent years, research has focused on the pathogenesis of VD, and mitochondrial bioenergetic deficits have been suggested to contribute to VD onset. To further investigate the role of mitochondria in VD, we used a rat model of VD, which involved permanent bilateral occlusion of the common carotid arteries (with a 1-week interval between artery occlusion to avoid an abrupt reduction in cerebral blood flow) leading to chronic cerebral hypoperfusion. Prior to occlusion, male Wistar rats underwent 7 days of Morris water maze training. Only animals that could swim and passed the Morris water maze test were chosen for the study. After 5 days of Morris water maze training, mitochondria from the hippocampi of rats, which were randomly selected from animals that could complete the Morris water maze test, were isolated for functional assessment. Mitochondria isolated from the hippocampi of rats from the ischemia group had decreased pyruvate dehydrogenase protein levels, and increased oxidative stress, as manifested by increased hydrogen peroxide production. The ischemia group mitochondria also exhibited decreased respiration coupled to decreased expression and activity of the electron transport chain complex IV (cytochrome c oxidase). These results indicate that the mitochondrial oxidative metabolism is inhibited in the hippocampi of rats following chronic ischemia-induced VD. As the mitochondrial oxidative metabolism deficits, namely mitochondrial bioenergetic deficits directly affect the functions of neurons, it may contribute to VD onset.
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Affiliation(s)
- J Du
- Department of Vascular Surgery, China-Japan Union Hospital, No. 829 Xinmin Street, ChaoYang District, Jilin University, Changchun 130021, Jilin Province, People's Republic of China.
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Shen Y, Li L, Lu Q, Ji J, Fei R, Zhang J, Abdel-Halim ES, Zhu JJ. Microwave-assisted synthesis of highly luminescent CdSeTe@ZnS–SiO2 quantum dots and their application in the detection of Cu(ii). Chem Commun (Camb) 2012; 48:2222-4. [DOI: 10.1039/c2cc16329b] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Zhang HH, Mei MH, Fei R, Liu F, Wang JH, Liao WJ, Qin LL, Wei L, Chen HS. Regulatory T cells in chronic hepatitis B patients affect the immunopathogenesis of hepatocellular carcinoma by suppressing the anti-tumour immune responses. J Viral Hepat 2010; 17 Suppl 1:34-43. [PMID: 20586932 DOI: 10.1111/j.1365-2893.2010.01269.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Chronic hepatitis B (CHB) virus hepatitis B virus (HBV) infection is the key cause of hepatocellular carcinoma (HCC) in Asians. Recent studies have shown that levels of CD4(+)CD25(+) regulatory T cells (Tregs) were increased and were linked to an impaired immune response in patients with CHB. Evaluating whether Tregs are involved in the progression of CHB to HCC will provide insight into the immunopathogenesis of HCC. In the present study, we showed that circulating and liver-residing Tregs increased in CHB (n = 15) and HCC (n = 49) patients, particularly in the peripheral blood of HCC patients with HBV infection (n = 29). The increased Tregs in CHB patients suppressed the specific immune response induced by not only HBV antigen, but also by HCC tumour antigen. When peripheral blood mononuclear cells (PBMC) were co-cultured with human hepatoma cell lines that are stably transfected with HBV (HepG2.2.15), CD4(+)CD25(+) Treg populations increased and upregulated the expression of forkhead box P3 transcriptional regulator (FoxP3), cytotoxic T lymphocyte-associated antigen-4 (CTLA-4) and glucocorticoid-induced tumour necrosis factor (TNF) receptor family gene (GITR). In contrast, PBMCs co-cultured with HepG2 cells (the parental cell line of HepG2.2.15) did not. CD4(+)CD25(+) Tregs isolated from PBMCs that were co-cultured with HepG2.2.15 cells also had a greater suppressive ability with respect to the tumour antigen-specific immune response induced by NY-ESO-1 or MAGE-A3 compared with CD4(+)CD25(+) Tregs isolated from PBMCs co-cultured with HepG2 cells. The results offer evidence that the expansion of CD4(+)CD25(+) Tregs and the enhancement of the suppressor function of CD4(+)CD25(+) Tregs induced by HBV infection-related factors could suppress the anti-tumour immune response to HCC tumour antigen and inhibit tumour immuno-surveillance against HCC, which may be involved in the immunopathogenesis from CHB to HCC.
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Affiliation(s)
- H H Zhang
- Peking University People's Hospital, Peking University Hepatology Institute, Beijing, China
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Zhan Y, Wang Y, Wei L, Chen H, Cong X, Fei R, Gao Y, Liu F. Differentiation of hematopoietic stem cells into hepatocytes in liver fibrosis in rats. Transplant Proc 2007; 38:3082-5. [PMID: 17112904 DOI: 10.1016/j.transproceed.2006.08.132] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [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: 03/08/2006] [Indexed: 12/12/2022]
Abstract
It has been reported that hematopoietic stem cells (HSC) can differentiate into hepatocytes in the normal liver and in some pathologic environments. The aim of this study was to investigate whether HSC can differentiate into hepatocytes in cases of established liver fibrosis. Rat liver fibrosis was induced by subcutaneous injection of tetrachloride (CCl4). Thy+ CD3- CD45RA- HSC in bone marrow cells, which had been enriched by fluorescence-activated cell sorting (FACS), were labeled with PKH26-GL, and autologously transplanted into CCl4-treated rats. The expressions of albumin (Alb), cytokeratin 8 (CK8), and alpha-smooth muscle actin (SMA) were determined by immunofluorescence methods. The PKH26-GL labeled Thy+ CD3- CD45RA- HSC expressed the hepatocyte-specific markers Alb and CK8, but did not express alpha-SMA in liver fibrosis. Thy+ CD3- CD45RA- HSC differentiated into hepatocytes, but not into hepatic stellate cells. In conclusion, autologous stem cell transplantation may be helpful to treat hepatic fibrosis.
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Affiliation(s)
- Y Zhan
- Peking University Hepatology Institute, Peking University People's Hospital, Beijing, China
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Liu F, Pan XB, Chen GD, Jiang D, Cong X, Fei R, Chen HS, Wei L. Hematopoietic stem cell mobilization after rat partial orthotopic liver transplantation. Transplant Proc 2006; 38:1603-9. [PMID: 16797365 DOI: 10.1016/j.transproceed.2006.02.121] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2005] [Indexed: 02/07/2023]
Abstract
BACKGROUND On the basis of the recently recognized potential of hematopoietic stem cells (HSC) to give rise to hepatocytes, we investigated the possibility that HSC could be mobilized and home to the injured liver promoting tissue repair after 50% partial orthotopic liver transplantation (PLTx) in the rat. METHODS Using sex-mismatched (female to male) syngeneic SD rats, we performed 50% PLTx or whole orthotopic liver transplantation (WLTx) versus 50% partial hepatectomy (PHx) and sham operation (O). Elements with stem cell markers were detected in peripheral blood (PB) and in the liver. Liver injury and regeneration were estimated. The sex-determining region for Y chromosome gene (SRY) was used to define cell origin by in situ hybridization in liver sections. RESULTS Comparison of WLTx and PHx groups showed a lower survival rate (50%), in the PLTx group were (P<.05). Further, the liver injury was more serious and the levels of serum biochemical parameters were higher. Compared with PHx groups, on days 3 and 5 postoperatively, the mitosis index and the expression of PCNA were lower among the PLTx groups. Compared with WLTx and sham operation groups, beta2m-/Thy-1.1+, CD34+ cells in PB in PLTx groups and PHx were increased on day 1 postoperatively and decreased on the following days. Compared with PHx groups, beta2m-/Thy-1.1+, CD34+ cells were higher in PLTx. The CD34-, c-kit-, and Thy-1.1-positive cells detected in portal tract areas peaked during 3 to 5 days postoperatively in PLTx. Few SRY+ cells were detected in PLTx liver grafts. CONCLUSIONS beta2m-/Thy-1.1+ and CD34+ stem cells mobilized after PLTx and PHx may be related to the reduced-size liver. Few HSC are involved in liver regeneration in PLTx.
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Affiliation(s)
- F Liu
- Hepatology Institute, Department of Gastroenterology, Peking University People's Hospital, Beijing, People's Republic of China
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Xue S, Liu Y, Zhang S, Ma W, Wang X, Fei R, Du Q, Zhang Z, Zhang J, Chen K, Zhou J, Ma J, Han D. [Erythroid differentiation denucleation factor: a family of erythroid regulators for mammalian erythroid terminal differentiation/tumor suppression and the cloning of their related genes]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 2000; 22:371-5. [PMID: 12903454] [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: 03/04/2023]
Abstract
The role of regulation of erythroid differentiation denucleation factor(EDDF) on mammalian erythroid differentiation and myeloma cell malignancy as well as cloning of their stage related genes were serially studied. Through a series of cybrid and hybridization experiments between mammalian erythroid cells and erythroleukemia or non-erythroid myeloma cells, we have demonstrated a novel family of erythroid regulators(EDDFs) in the mammalian differentiating erythroblasts which with an active peak occurred concomitantly with marked decreases in DNA, RNA and the nuclear anchoring vimentin-IF, but increased in hemoglobin synthesis in cytoplasm prior to the denucleation process during terminal differentiation. The results of cell fusion experiments verified that the supplement of regulators(EDDFs) was critical to the recovery of the originally lost features of terminal differentiation and the reversion of malignant phenotype of tumor cells. Here we showed that the erythroid regulator family EDDFs were essential regulators for the sequential expression of stage related genes of erythroid terminal differentiation, and for the redifferentiation of tumor cells to express the originally inactive globe genes, repressed the oncogenes, and vimentin-IF system, thus initiated nuclear condensation and denucleation. The EDDF gene family consisted of MEDDF, HEDDF-1, HEDRF-1, HEDRF-2 and HCNBP-1 were cloned. All were novel cDNA sequences that have been searched and registered in GenBank. They expressed varying in a stage specific manner, and acted on corresponding genes of terminal differentiation.
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Affiliation(s)
- S Xue
- Department of Cell Biology, Institute of Basic Medical Sciences, CAMS, PUMC, Beijing 100005, China.
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Abstract
These experiments explored the interactions remaining between the cerebral hemispheres in two split-brain macaques. The 'split' was earlier confirmed by showing that one hemisphere was incapable of identifying visual images seen by the other. The critical tests for residual interactions were intermingled with control trials in a continuous recognition task. These tests were of two kinds: 'parallel processing', to determine how simultaneous viewing by both hemispheres affected subsequent recognition by one of them alone; and 'conflict', where opposite responses were demanded from the two hemispheres, thus assessing the issue of metacontrol. Two types of stimuli were also employed: ART, in which each hemisphere saw essentially the same image; and BIPARTITE, in which images were entirely different for each hemisphere. Since, with either type of stimulus, performance was best when viewed by both hemispheres at both encoding and retrieval, 'parallel processing' was highly efficient. However, when both hemispheres viewed initially and only one was subsequently queried, performance was significantly worse than when each hemisphere acted alone on each occasion. It is thus reasoned that when both hemisphere view together, the resultant memory trace somehow reflects the bilaterality, a conclusion concordant with observations of Marcel on blindsight. Processing different images (BIPARTITE) was somewhat more disruptive in this regard than if the same image was viewed by each hemisphere. This was particularly true in the conflict situation, where for one hemisphere the item seen was NEW and for the other it was OLD. A response of 'OLD' was, at first, consistently rewarded. When this well-established protocol was changed, the hemispheres in each animal were gradually able to revise their joint behavior. This, together with the effect of disparate images, and the deficiency evoked when the animals were forced to recognize unilaterally an image first viewed under bilateral conditions, all manifest considerable, and complex, interaction between the hemispheres despite absence of the forebrain commissures. The superior colliculus seems a likely focal point for such interhemispheric effects.
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Affiliation(s)
- V Kavcic
- Department of Neurobiology and Anatomy, University of Rochester School of Medicine and Dentistry, Box 603, Rochester, NY 14642, USA
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Cao J, Fei R, Zhao Y, Chen H, Jin W, Chen S. [Effect of low dose gossypol treatment on male sperm nuclear basic protein]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 2000; 22:220-2. [PMID: 12903463] [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: 03/04/2023]
Abstract
OBJECTIVE Study on human sperm nuclear basic proteins after low dose of gossypol treatment. METHODS Twenty-three men with normal fertility were divided into two groups. The experimental group included 15 men which were treated daily with gossypol (15 mg/d for 12 weeks and treated with 10 mg/d for 32 weeks continuously), 8 men were used in the control group. Semen was collected at 1, 4, 8, 12, 16, 24, 36 and 44 weeks after gossypol treatment and 10 weeks after stopping treatment. Total nuclear basic protein (TNBP) was extracted and TH/TP, HP1/(HP2+HP3) ratios were determined by scanning microdensitometry following electrophoresis of TNBP in polyacrylamide gels. RESULTS The TH/TP ratio of control and the gossypol treated group were 0.17 +/- 0.07 and 0.63 +/- 0.79(P < 0.05); The HP1/(HP2+HP3) ratio of control and gossypol treated group were 1.05 +/- 0.21 and 1.47 +/- 0.18 (P < 0.01). These two parameters were returned to normal after 10 weeks of stopping gossypol treatment. CONCLUSIONS The interruption of histone-to-protamine replacement reaction (HPRR) and alteration of nuclear basic proteins induced by low dose gossypol treatment might lead to infertility. Changes of HPRR and nuclear basic protein were reversible after stopping gossypol treatment.
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Affiliation(s)
- J Cao
- Department of Urology, PUMC Hospital, CAMS, PUMC, Beijing 100730, China
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18
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Abstract
Accuracy of response and pattern of ocular fixations in three split-brain macaques were used to evaluate performance of each hemisphere in a continuous visual recognition task. The animal indicated by ocular fixation upon response points whether a displayed image or face was 'NEW' or 'OLD'. An inadvertent lesion of cingulate gyrus severely reduced contralateral fixations and impaired performance of the affected hemisphere in one animal, confirming the inferred relation between hemisphere and laterality of fixations. The hemispheres in the other two animals were initially remarkably similar in accuracy with human faces and with images; but the right hemisphere was significantly superior to the left for macaque faces. Parallel to this, in the one animal tested while simultaneously using both eyes/hemispheres, fixations were made primarily on the left half of human and macaque faces (right hemispheric control), whereas for images the ocular fixations were predominantly focused on the right half. However, after further, extensive training the left hemisphere performed with significantly greater accuracy than the right on all material and this shift was accompanied and further corroborated by a reversal of the fixational pattern to favor the right half of faces, as continued to be the case with images. Thus, over the long term both the pattern of ocular fixations and the accuracy of performance demonstrate a migration from right to left hemispheric dominance as familiarity with the task increased. Performance of the initially superior hemisphere actually diminished with this shift, presenting a uniquely puzzling question of hemispheric balance in the absence of the forebrain commissures.
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Affiliation(s)
- R W Doty
- Department of Neurobiology and Anatomy, University of Rochester School of Medicine and Dentistry, NY 14642, USA.
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19
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Tong W, Gao W, Fei R, Feng B, Tao Q. Development of a universal immunoenzyme quantitative assay for detecting amplified products of nucleic acid and its preliminary application in hepatitis C virus. Chin Med J (Engl) 1999; 112:392-5. [PMID: 11593505] [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: 02/21/2023] Open
Abstract
OBJECTIVE To develop a universal quantitative immunoenzyme assay (EIA) for detecting amplified products of nucleic acid and its application in hepatitis C virus (HCV). METHODS The appropriate cycle number of amplification was selected to stop polymerase chain reaction (PCR) before the "plateau stage". At the same time, primers HCV (3) of the second PCR were modified with biotin so that the amplified products were labeled. The products were diluted and subsequently added to the streptavidin-coated wells, and the biotinylated products were captured, followed by denaturation of NaOH, and non-biotinylated strands were removed. Hybridization was performed by adding the specific probe labeled with fluorescein. Finally antifluorescein horse radish peroxidase (HRP) conjugates were added, after washing, 3, 3', 5, 5',-tetramethylbenzidine (TMB) was added to the wells and then measured on a microplate reader. RESULTS EIA detection of amplified products of HCV showed that this assay was rapid, sensitive, specific and accurate. Correlation between the initial number of viral template and the EIA of amplified products was good. We also prospectively investigated the response to interferon in five patients with HCV coinfection. Results showed that this assay could be used as a guidance to the clinical therapy in directing the use of antiviral drugs. CONCLUSIONS This assay could be widely used as a universal technique for the quantitative detection of amplified products of all nucleic acid (such as virus, bacterium) and other human genes (such as HLA B27), it has vast vistas.
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Affiliation(s)
- W Tong
- Hepatology Institute, People's Hospital, Beijing Medical University, Beijing 100044, China
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20
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Reisman M, Shuman BJ, Dillard D, Fei R, Misser KH, Gordon LS, Harms V. Analysis of low-speed rotational atherectomy for the reduction of platelet aggregation. Cathet Cardiovasc Diagn 1998; 45:208-14. [PMID: 9786404 DOI: 10.1002/(sici)1097-0304(199810)45:2<208::aid-ccd21>3.0.co;2-f] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Platelet activation is an important determinant of acute outcomes of percutaneous intervention. The objective of this study was to assess the effect of rotational atherectomy on platelet activation in an in vitro model. Freshly collected heparinized porcine blood was exposed to a 2.0-mm Rotablator burr rotating at one of three speeds: 180,000, 140,000, or 0 rpm. The specimens were analyzed immediately for concentration and size of platelet aggregates and plasma-free hemoglobin. There were significantly more platelet aggregates of >20-microm diameter at higher speeds (7,434+/-2,193 at 180,000, vs. 2,269+/-627 at 140,000, vs. 633+/-258 aggregates/ml at 0 rpm; P < 0.001). Plasma-free hemoglobin, a simple measure of cell damage, decreased with decreasing rotational speed (429+/-168 mg/dl at 180,000, vs. 88+/-44 mg/dl at 140,000, vs. 9+/-9 mg/dl at 0 rpm; P < 0.0001). In vitro, platelet activation decreases with decreasing burr speed, suggesting that the use of the Rotablator system at its minimum approved speed (140,000 rpm) could prove clinically beneficial.
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Affiliation(s)
- M Reisman
- Swedish Medical Center, Seattle, Washington, USA.
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21
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Abstract
Cultured cells from Micropolyspora faeni-sensitized donors can adoptively transfer murine experimental hypersensitivity pneumonitis (EHP). We sought to determine the location of transferred cells in recipient animals, the influence of the origin of the cultured cells, and the effect of specific intratracheal challenge. We labeled cultured sensitized spleen or lung-associated lymph node (LALN) cells with CFDA-SE, a cytoplasmic stain, before transfer to naive recipients, which were sacrificed 1 h, 1 day, or 4 days thereafter. We also transferred labeled cultured spleen cells to recipients that were challenged with intratracheal M. faeni and sacrificed 4 days later (MF). Controls were recipients of M. faeni-sensitized and cultured cells challenged with intratracheal normal saline (NS) and recipients of ovalbumin (OVA)-sensitized cells cultured with M. faeni and challenged with intratracheal M. faeni (OVA). The number and proportion of cells that were stained were determined in dispersed spleen, peripheral and lung-associated lymph nodes, and lung parenchyma. The extent of the pulmonary inflammatory response was measured by determining the proportion of microscopic fields that were abnormal and the total number of dispersed pulmonary cells. CFDA-SE stained cells uniformly, and stained cells could be detected in recipients for up to 7 days after transfer. CFDA-SE treatment (0.5 microM) did not affect the ability of cells to transfer EHP adoptively. Transferred cells could be detected easily in lung, lung-associated and peripheral lymph nodes, blood, and spleen. Transferred cells localized to the lung at 1 h but then rapidly decreased with no difference between labeled cells from spleen and LALN. After intratracheal M. faeni challenge, there was no difference in the proportion of labeled cells in the lung among any of the groups (MF, NS, or OVA). There was an increase in the number of lung cells in the MF group compared with the control (NS and OVA) groups. We conclude that cells capable of transfer are transiently (1 h) trapped in the lung but are much decreased in the lung by four days after transfer. After intratracheal antigen challenge of recipients, there is a substantial increase in the number of pulmonary cells in animals exhibiting adoptive EHP but not in the control groups. Transferred cells responsible for EHP are increased in the lungs of animals with adoptive EHP.
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Affiliation(s)
- M Schuyler
- Department of Medicine, Albuquerque Veterans Administration Medical Center, NM 87108, USA
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22
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Abstract
The observation of the C-Cl stretching fundamental of HC35 Cl in its ground X ; 1 A ' state is reported. HCCl was formed in a continuous flow system by the excimer laser photolysis of CHBr2 Cl at 193 nm and the transient absorption recorded by infrared diode laser spectroscopy. The band has a -type character and the fundamental vibrational frequency is found to be 811.5963 cm-1 . No evidence was found for perturbations in either the ground or vibrationally excited states, implying that the excited triplet a 3 A " states lies above the C-Cl stretching level in HCCl. The observed rotation-vibration transitions were well fit by a standard asymmetric rotor Hamiltonian. There is a decrease in the A rotational constant on vibrational excitation, suggesting that some bend-C-Cl stretch coupling is present.
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Affiliation(s)
- BC Chang
- Department of Chemistry, National Central University, Chung-Li, 32054, Taiwan
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23
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Fei R, Gott K, Edwards B, Schuyler M. Experimental hypersensitivity pneumonitis: in vitro effects of interleukin-2 and interferon-gamma. J Lab Clin Med 1995; 126:485-494. [PMID: 7595034] [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] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Cultured CD4+ cells are responsible for transfer of adoptive murine experimental hypersensitivity pneumonitis (EHP) (ARRD 1992; 146:1582-8). To characterize interactions that occur in vitro that result in cells able to transfer EHP, we added either antibody to IFN-gamma, antibody to IL-2, or 30 or 300 micrograms/ml IFN-gamma at the onset of 72-hour culture of C3H/HeJ spleen cells from either M. faeni or ovalbumin (control) sensitized donors with 30 micrograms/ml Micropolyspora faeni. We determined the phenotype of cells after culture and the amount of IL-2 or IFN-gamma in the culture supernatants, transferred cells to naive recipients, challenged the recipients intratracheally with M. faeni, and determined the extent of pulmonary inflammatory changes 4 days thereafter. Substantial amounts of IL-2 and IFN-gamma were detected in supernatants of cultures from M. faeni-sensitized animals, and lesser amounts were detected in culture supernatants from ovalbumin-sensitized donors. Treatment of cultures of M. faeni-sensitized cells with antibody to IL-2 or IFN-gamma blocked or reduced measurable IL-2 or IFN-gamma for the duration of culture. Treatment with IFN-gamma blocked increased levels of IL-2 at 48 and 72 hours of culture. Cultured M. faeni-sensitized cells adoptively transfer EHP. Cells from cultures depleted of either IL-2 or IFN-gamma or supplemented with IFN-gamma could transfer EHP equally well. We conclude that in vitro maturation of cells capable of adoptive EHP is not dependent on soluble IL-2 or IFN-gamma and is not altered by exogenous IFN-gamma.
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Affiliation(s)
- R Fei
- Department of Medicine, Albuquerque Veterans Administration Medical Center, NM 87108, USA
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24
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Fei R, Adelman D, Carrington T, Dugan C, Filseth S. Rotational energy transfer in collisions between CN (X, ν = 2) and argon. Comparison with results for helium. Chem Phys Lett 1995. [DOI: 10.1016/0009-2614(94)01356-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Sassoon CS, Del Rosario N, Fei R, Rheeman CH, Gruer SE, Mahutte CK. Influence of pressure- and flow-triggered synchronous intermittent mandatory ventilation on inspiratory muscle work. Crit Care Med 1994; 22:1933-41. [PMID: 7988129] [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: 01/28/2023]
Abstract
OBJECTIVE To determine the effect of pressure- and flow-triggered synchronous intermittent mandatory ventilation on inspiratory muscle work. DESIGN Consecutive clinical, prospective, randomized trial. SETTING Medical intensive care unit (ICU) of a U.S. Veterans Affairs Medical Center. PATIENTS Eight patients recovering from acute respiratory failure of various etiologies. INTERVENTIONS Assist control, followed by randomized application of pressure- and flow-triggered synchronous intermittent mandatory ventilation at 60%, 40%, 20% of the assist-control rate, and flow-triggered continuous positive airway pressure. A total of eight settings were maintained for 10 mins each. MEASUREMENTS AND MAIN RESULTS Total work rate (joules/min), inspiratory muscle work (joules/L), and pressure time-product per breath (cm H2O-sec) were measured. During pressure- or flow-triggered synchronous intermittent mandatory ventilation, total work rate increased as the mandatory rate was decreased. The method of ventilator triggering had a significant effect on the total work rate. With pressure-triggered synchronous intermittent mandatory ventilation, the total work rate at 60% of the assist-control rate was similar to that with assist-control; whereas with flow-triggered synchronous intermittent mandatory ventilation, this result was achieved at 40% of the assist-control rate. At a machine support level of 20%, total work rate with pressure-triggered synchronous intermittent mandatory ventilation was significantly greater than with flow-triggered synchronous intermittent mandatory ventilation. The method of ventilator triggering had no significant effect on the inspiratory muscle work of the mandatory breaths. This finding was in contrast to the effect on inspiratory muscle work of spontaneous breaths. With pressure-triggered synchronous intermittent mandatory ventilation, inspiratory muscle work of the spontaneous breaths was greater than with the flow-triggered at machine support of 40% and 20%. With either pressure- or flow-triggered synchronous intermittent mandatory ventilation, inspiratory muscle work of the mandatory breaths was not significantly different from that of the corresponding spontaneous breaths, except at the lower machine support levels with the pressure-triggered synchronous intermittent mandatory ventilation. Pressure-time product followed a trend similar to that of inspiratory muscle work. CONCLUSIONS During synchronous intermittent mandatory ventilation, the method of ventilator triggering has a significant effect on the total work rate and inspiratory muscle work of the spontaneous breaths, particularly at lower machine support levels. Conversely, the method of ventilator triggering has no significant effect on inspiratory muscle work of the mandatory breaths.
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Affiliation(s)
- C S Sassoon
- Department of Medicine, Veterans Affairs Medical Center, Long Beach, CA 90822
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26
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Fei R, Lambert HM, Carrington T, Filseth SV, Sadowski CM, Dugan CH. Direct measurement of thermal rate constants for state‐to‐state rotational energy transfer in collisions of CN(X 2Σ+, v=2, N) with He. J Chem Phys 1994. [DOI: 10.1063/1.466649] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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27
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Wu Z, Fei R, Zhou S, Shi F, Li C, Wang B. Kinetic studies of haemopoietic progenitor cells (CFU-C) and T-lymphocytes in the liver of human foetus. Sci Sin B 1982; 25:168-75. [PMID: 6980464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
In the development of human foetus, liver is an important haemopoietic organ. We have determined the liver weight and total hepatic nucleated cells from 24 foetuses on the one hand, and CFU-C yield, total number of CFU-C and T-lymphocytes in liver from 22 foetuses of different ages on the other. From the kinetic observations through the early developmental period of the foetuses, the maximum yield of CFU-C or the total number of CFU-C in the liver occurs at 4-5 months of gestation; during the first 5 months of gestation the percentage of T-lymphocytes in the liver is about 1-2%.
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