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Kim W, Venkatakrishnan K, Kim T, Lin CC, Thye L, Chng W, Ma B, Chen MH, Liu H, Benaim E. Phase 1 Study of MLN8237 (Alisertib) in Adult East Asian Patients (PTS) with Advanced Solid Tumors or Lymphomas. Ann Oncol 2013. [DOI: 10.1093/annonc/mdt459.76] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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102
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Ren S, Xia P, Ma B, He YF, Yang Y, Tang MY, Ma SL. Synthesis and magnetic properties of a new binuclear copper(II) complex with naphthalato-bridged ligand. RUSS J COORD CHEM+ 2013. [DOI: 10.1134/s1070328413070105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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103
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Ma B, Brotman RM, Gajer P, Fadrosh D, Mahurkar A, White O, Terplan M, Bavoil P, Forney LJ, Ravel J. O05.4 Association Between Chlamydia Trachomatis Genital Infection and the Vaginal Microbiome. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.0110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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104
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Wang J, Yang Y, Ma J, Xing D, Zhu S, Ma B, Chen Y, Ma X. Open reduction and internal fixation versus external fixation for unstable distal radial fractures: a meta-analysis. Orthop Traumatol Surg Res 2013; 99:321-31. [PMID: 23523527 DOI: 10.1016/j.otsr.2012.11.018] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Accepted: 11/19/2012] [Indexed: 02/02/2023]
Abstract
PURPOSE To compare the clinical outcomes of open reduction and internal fixation (ORIF) versus the ones of closed reduction and external fixation (EF) in the treatment of distal radial fractures. METHODS We performed a meta-analysis of randomized controlled trials that compared the clinical results of ORIF to EF in the treatment of distal radial fractures. A systemic retrieve from PubMed, EMBASE, OVID and Cochrane Collaboration CENTRAL database resulted in 11 studies with 824 patients. We thus performed data synthesis using RevMan (version 5.1). RESULTS Superior statistical differences were observed for DASH scores (at 3, 6 and 12 months follow-up) grip strength (at 3 months follow-up), volar tilt (at 12 months follow-up), flexion and supination (at 3 months follow-up), and extension (at 3 and 6 months follow-up) in ORIF patients group, compared with those in EF group. We also found a significantly higher risk of infection associated with EF. There was no significant difference in the incidence of malunion and median nerve dysfunction. CONCLUSION Regarding surgical fixation of unstable distal radius fractures, ORIF yields significantly better subjective outcome (DASH scores) the first year after operation, restoration of anatomic volar tilt, and forearm flexion and extension at the end of the follow-up period. However, EF results in higher incidence of infection compared to ORIF. ORIF is equal to EF for either grip strength, or range of motion of the injured wrist, or incidence of malunion or median nerve dysfunction at the end of the follow-up period. LEVEL OF EVIDENCE Level II. Therapeutic study.
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Ma B, Zhou PY, Ni W, Wei W, Ben DF, Lu W, Xia ZF. Inhibition of activin receptor-like kinase 5 induces matrix metallopeptidase 9 expression and aggravates lipopolysaccharide-induced pulmonary injury in mice. EUROPEAN REVIEW FOR MEDICAL AND PHARMACOLOGICAL SCIENCES 2013; 17:1051-1059. [PMID: 23661518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
BACKGROUND TGF-β (Transforming Growth Factor-β) mediates its biological effects through members of activin receptor-like kinase (ALK) family and TGF-β/Smad3 signaling link inflammation to pulmonary fibrosis. AIM The aim of this study was to evaluate the role of SB431542 as a specific inhibitor of Activin receptor-Like Kinase 5 (ALK5) in pneumonic injury. MATERIALS AND METHODS Anesthetized and endo-tracheally intubated C57BL/6 mice were randomized to three groups: the control group with intra-tracheal instillation of 1.5 mg/kg normal saline (NS); LPS stimulation group with intra-tracheal instillation of 3 mg/kg LPS (lipopolysaccharide); and LPS+SB431542 group with intra-peritoneal (i.p.) injection of 4.2 mg/kg SB431542 1 h before intra-tracheal instillation of 3 mg/kg LPS. The lung tissue was obtained 6 h after injury, and the degree of pulmonary injury was evaluated by pathologic scoring. The lung wet/dry weight ratio was measured. TNF-α, IL-1β, and MMP-9 (matrix metallopeptidase-9) mRNA expression levels were assayed by real time PCR (polymerase chain reaction). The content of MMP-9 total protein was measured by Western blotting. The content of active MMP-9 was detected by gelatin zymography. Location of MMP-9 in mouse lung tissue was monitored by immunohistochemistry. RESULTS The results showed that (1) pathologic changes including interstitial pulmonary edema, neutrophil infiltration, alveolar edema and hemorrhage were observed 6 h after LPS instillation. The lung wet/dry weight rate and pathologic scores confirmed that SB431542 administration aggravated LPS injury to the mouse lung; (2) the amount of TNF-α and IL-1β mRNA expression in LPS groups was significantly higher than that in the control group, and the highest in LPS+SB431542 group; (3) the amount of MMP-9 mRNA and MMP-9 protein expression and active MMP-9 in the lung tissue of LPS groups was significantly higher than that in the control group 6 h after injury, and the highest in LPS+SB431542 group; and (4) MMP-9 expression was mainly observed in the airway epithelial cells, vascular smooth muscle cells and cytoplasm of inflammatory cells as shown by immunohistochemistry, and brownish yellow uniformed stained areas were also seen in the exudate from part of the alveoli. CONCLUSIONS These results indicate that blocking the activity of TGF-β/Smad pathway by specific inhibitor SB431542 of ALK5 promoted the releaser of large amounts of TNF-α, IL-1β and other pro-inflammatory cytokines from the lung tissue of mice sustaining acute lung injury (ALI). At the same time, the amount and activity of MMP-9 expression in the lung were increased, and MMP-9 expression was mainly located in the airway epithelial cells, vascular smooth muscle cells and inflammatory cells, causing increased permeability of the pulmonary blood vessels, degradation of the extracellular matrix and destruction of the normal lung tissue structures, which directly or indirectly promotes the progression of pulmonary inflammatory responses and aggravates ALI.
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Ma B, Leijten JCH, Wu L, Kip M, van Blitterswijk CA, Post JN, Karperien M. Gene expression profiling of dedifferentiated human articular chondrocytes in monolayer culture. Osteoarthritis Cartilage 2013; 21:599-603. [PMID: 23376013 DOI: 10.1016/j.joca.2013.01.014] [Citation(s) in RCA: 128] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2012] [Revised: 01/08/2013] [Accepted: 01/12/2013] [Indexed: 02/02/2023]
Abstract
OBJECTIVE When primary chondrocytes are cultured in monolayer, they undergo dedifferentiation during which they lose their phenotype and their capacity to form cartilage. Dedifferentiation is an obstacle for cell therapy for cartilage degeneration. In this study, we aimed to systemically evaluate the changes in gene expression during dedifferentiation of human articular chondrocytes to identify underlying mechanisms. METHODS RNA was isolated from monolayer-cultured primary human articular chondrocytes at serial passages. Gene expression was analyzed by microarray. Based on the microarray analysis, relevant genes and pathways were identified. Their functions in chondrocyte dedifferentiation were further investigated. RESULTS In vitro expanded human chondrocytes showed progressive changes in gene expression. Strikingly, an overall decrease in total gene expression was detected, which was both gradual and cumulative. DNA methylation was in part responsible for the expression downregulation of a number of genes. Genes involved in many pathways such as the extracellular-signal-regulated kinase (ERK) and Bone morphogenetic protein (BMP) pathways exhibited significant changes in expression. Inhibition of ERK pathway did not show dramatic effects in counteracting dedifferentiation process. BMP-2 was able to decelerate the dedifferentiation and reinforce the maintenance of chondrocyte phenotype in monolayer culture. CONCLUSION Our study not only improves our knowledge of the intricate signaling network regulating maintenance of chondrocyte phenotype, but also contributes to improved chondrocyte expansion and chondrogenic performance for cell therapy.
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Ma B, Hang L, Chen G, Du Y. Effect of clopidogrel with or without omeprazole in patients with carotid artery stenting. W INDIAN MED J 2013; 62:135-139. [PMID: 24564063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
BACKGROUND Recent concerns have been raised about the potential for proton pump inhibitors (PPIs) to blunt the efficacy of clopidogrel. We observed the effect of clopidogrel plus aspirin with or without omeprazole in patients with carotid stenoses after they received placement of carotid stents. METHODS Sixty-four consecutive patients treated with percutaneous carotid artery stenting (CAS) comprised the sample. All enrolled patients underwent the C13 urea breath test (C13 UBT) before CAS. Patients with Helicobacter pylori infection and a history of peptic ulcer were assigned dual antiplatelet combination with omeprazole. Others received dual antiplatelet without omeprazole. Transcranial Doppler and ultrasonography were performed to assess the middle cerebral artery and carotid artery in follow-up at three months and six months. RESULTS Eight patients had gastrointestinal bleeding; the event rate was 22.6% without omeprazole and 3.8% with omeprazole. The rate of gastrointestinal bleeding was reduced with omeprazole as compared without omeprazole (p = 0.026, p < 0.05). The two groups did not differ significantly in the rate of in-stent restenosis and thrombus through transcranial Doppler and ultrasonography. CONCLUSION Among patients receiving dual antiplatelet therapy, prophylactic use of omeprazole reduced the rate of upper gastrointestinal bleeding. There was no apparent interaction between clopidogrel and omeprazole in patients with carotid artery stenting.
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Ma B, Sen T, Asnaghi L, Valapala M, Yang F, Hose S, McLeod DS, Lu Y, Eberhart C, Zigler JS, Sinha D. βA3/A1-Crystallin controls anoikis-mediated cell death in astrocytes by modulating PI3K/AKT/mTOR and ERK survival pathways through the PKD/Bit1-signaling axis. Cell Death Dis 2011; 2:e217. [PMID: 21993393 PMCID: PMC3219085 DOI: 10.1038/cddis.2011.100] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
During eye development, apoptosis is vital to the maturation of highly specialized structures such as the lens and retina. Several forms of apoptosis have been described, including anoikis, a form of apoptosis triggered by inadequate or inappropriate cell–matrix contacts. The anoikis regulators, Bit1 (Bcl-2 inhibitor of transcription-1) and protein kinase-D (PKD), are expressed in developing lens when the organelles are present in lens fibers, but are downregulated as active denucleation is initiated. We have previously shown that in rats with a spontaneous mutation in the Cryba1 gene, coding for βA3/A1-crystallin, normal denucleation of lens fibers is inhibited. In rats with this mutation (Nuc1), both Bit1 and PKD remain abnormally high in lens fiber cells. To determine whether βA3/A1-crystallin has a role in anoikis, we induced anoikis in vitro and conducted mechanistic studies on astrocytes, cells known to express βA3/A1-crystallin. The expression pattern of Bit1 in retina correlates temporally with the development of astrocytes. Our data also indicate that loss of βA3/A1-crystallin in astrocytes results in a failure of Bit1 to be trafficked to the Golgi, thereby suppressing anoikis. This loss of βA3/A1-crystallin also induces insulin-like growth factor-II, which increases cell survival and growth by modulating the phosphatidylinositol-3-kinase (PI3K)/AKT/mTOR and extracellular signal-regulated kinase pathways. We propose that βA3/A1-crystallin is a novel regulator of both life and death decisions in ocular astrocytes.
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Zhu H, Li Z, Mao S, Ma B, Zhou S, Deng L, Liu T, Cui D, Zhao Y, He J, Yi C, Huang Y. Antitumor effect of sFlt-1 gene therapy system mediated by Bifidobacterium Infantis on Lewis lung cancer in mice. Cancer Gene Ther 2011; 18:884-96. [PMID: 21921942 PMCID: PMC3215997 DOI: 10.1038/cgt.2011.57] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Soluble fms-like tyrosine kinase receptor (sFlt-1) is a soluble form of extramembrane part of vascular endothelial growth factor receptor-1 (VEGFR-1) that has antitumor effects. Bifidobacterium Infantis is a kind of non-pathogenic and anaerobic bacteria that may have specific targeting property of hypoxic environment inside of solid tumors. The aim of this study was to construct Bifidobacterium Infantis-mediated sFlt-1 gene transferring system and investigate its antitumor effect on Lewis lung cancer (LLC) in mice. Our results demonstrated that the Bifidobacterium Infantis-mediated sFlt-1 gene transferring system was constructed successfully and the system could express sFlt-1 at the levels of gene and protein. This system could not only significantly inhibit growth of human umbilical vein endothelial cells induced by VEGF in vitro, but also inhibit the tumor growth and prolong survival time of LLC C57BL/6 mice safely. These data suggest that Bifidobacterium Infantis-mediated sFlt-1 gene transferring system presents a promising therapeutic approach for the treatment of cancer.
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Zheng B, Ma B, Yang K, Mi D. Meta-analysis of randomized controlled trials comparing D2 and D4 lymphadenectomy for gastric cancer. Eur Surg 2011. [DOI: 10.1007/s10353-011-0614-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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111
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Wang J, Cai D, Ma B, Wu G, Wu J. Skewing the Balance of Regulatory T-Cells and T-Helper 17 Cells in Breast Cancer Patients. J Int Med Res 2011; 39:691-701. [PMID: 21819700 DOI: 10.1177/147323001103900301] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
This study investigated the distribution of interleukin (IL)-17-producing CD4+ T-cells (T-helper [Th17] cells) in relation to CD4+CD25+CD127− cells (regulatory T-cells [Treg]) in tumour-infiltrating lymphocytes (TILs) and peripheral blood mononuclear cells (PBMCs) from breast cancer patients. The Th17 and Treg cells were evaluated by flow cytometry and reported as a percentage of total CD4+ cells. In TILs from early breast cancer patients ( n = 12), the frequency of Th17 cells was significantly higher than in PBMCs (14.5 ± 7.2% versus 6.9 ± 2.1%). In TILs from patients with advanced breast cancer ( n = 15), the frequency of Th17 cells was also significantly higher than that in PBMCs (9.1 ± 5.7% versus 3.2 ± 2.3%) but lower compared with early disease. The Th17/Treg ratio in TILs was markedly increased in early versus advanced disease. In conclusion, Th17 and Treg cell accumulation in the tumour microenvironment of breast cancer occurred in early disease; Th17 cell infiltration gradually decreased and Treg cells accumulated with disease progression.
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Hui EP, Taylor GS, Ma B, Chan SL, Ho R, Wong W, Jia H, Edwards C, Rickinson AB, Chan ATC, Steven NM. A phase I trial of recombinant modified vaccinia ankara (MVA) vaccine encoding Epstein-Barr virus (EBV) antigens. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.2592] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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113
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Carlino MS, Saunders CA, Gebski V, Menzies AM, Ma B, Lebowitz PF, Kefford R, Long GV. Heterogeneity of FDG-PET response to GSK2118436, an inhibitor of oncogenic mutant BRAF-kinase in BRAF-mutant metastatic melanoma. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.8539] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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114
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Nathanson KL, Martin A, Letrero R, D'Andrea KP, O'Day S, Infante JR, Falchook GS, Millward M, Curtis CM, Ma B, Gagnon RC, Lebowitz PF, Long GV, Kefford RF. Tumor genetic analyses of patients with metastatic melanoma treated with the BRAF inhibitor GSK2118436 (GSK436). J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.8501] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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115
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Chan SL, Chan AK, Hui EP, Yu S, Leung L, Loong HHF, Ma B, Mok T, Chan ATC, Yeo W. Quantitation of circulating methylated RASSF1A in prognostication and monitoring of treatment response in unresectable hepatocellular carcinoma (HCC). J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.4058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Loong HHF, Ma B, Mo F, Leung SF, Hui EP, Kam MK, Chan SL, Chan ATC. The effect of cisplatin dose administered during concurrent chemoradiotherapy in patients with locoregionally advanced nasopharyngeal carcinoma. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.5532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Jia WQ, Tian JH, Yang KH, Ma B, Liu YL, Zhang P, Li RJ, Jia RH. Open versus laparoscopic pyloromyotomy for pyloric stenosis: a meta-analysis of randomized controlled trials. Eur J Pediatr Surg 2011; 21:77-81. [PMID: 20957601 DOI: 10.1055/s-0030-1261926] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVE Aim of the study was to compare the outcomes after laparoscopic pyloromyotomy (LP) with those of open pyloromyotomy (OP) for infantile pyloric stenosis. METHOD We conducted searches until February 2009 in multiple databases and identified randomized controlled trials comparing LP with OP for pyloric stenosis. Results were expressed using the odds ratio (OR) for categorical variables and standard weighted mean differences (SMD) for continuous outcomes. Study quality was assessed using the Cochrane Handbook 5.0.1 guidelines and statistical analysis was performed using RevMan 5.0.8 software. RESULTS 3 studies totaling 492 infants were included. The results showed no significant differences in complications between the groups with regard to wound infection (OR: 1.77, 95% CI 0.58-5.35), mucosal perforations (OR: 0.96, 95% CI: 0.22-4.26), incisional hernia or granuloma (OR: 1.39, 95% CI: 0.41-4.73), incomplete pyloromyotomy (OR: 0.13, 95% CI: 0.02-1.07), substantial vomiting (OR: 0.67, 95% CI: 0.30-1.52) and total complications (OR: 0.91, 95% CI: 0.54-1.53). Although the combined result of 2 studies also indicated an insignificant discrepancy in time-related outcomes for full time to feeds, length of stay after surgery and operating time (SMD: 0.78, 95% CI: -0.50-2.06; SMD: 1.27, 95% CI: -1.56-4.10; SMD: -0.46, 95% CI: -1.11-0.20, respectively), another study indicated shorter times for LP procedures (p=0.002, 0.027, and 0.008, respectively). CONCLUSIONS Only a few trials were available for analysis. Heterogeneity was seen between studies, but the available trials were of high quality. The present study shows that both OP and LP are equally safe and effective procedures for the management of pyloric stenosis in children. However, there was a trend in LP toward shorter time time-related outcomes.
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Mitchell B, Richardson J, Ma B, Hodges J. In-Situ Neutron Diffraction Studies of Mixed Conducting Sr-Fe-Co-O Materials. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-547-345] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractSrFeCo0.5Oy has been identified as a potential dense ceramic membrane material used for gas separation at elevated temperatures. Neutrons play an important role in the study of such materials, particularly due to the favorable scattering lengths of Fe, Co and O. In-situ neutron diffraction experiments allow these materials to be studied under a wide range of temperatures and oxygen partial pressures. Results indicate very complex behavior of individual phases during synthesis and under operational membrane conditions.
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He W, Wong SC, Ma B, NG SS, Lam MY, Chan CM, Au TC, Chan JK, Chan AT. The expression of frizzled-3 receptor in colorectal cancer and colorectal adenoma. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.4_suppl.444] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
444 Background: Wnt signaling is well known for its role in colorectal cancer (CRC) formation through transcriptional activities of nuclear β-catenin. Although activation of Wnt signaling depends on specific Wnt/Frizzled receptors (FZD) combinations, the specificity of the interaction and the role of FZD in that particular interaction are still unknown. Among the 10 Wnt receptors of the FZD protein family, FZD-3 is involved in neurodevelopmental abnormalities and gastric cancer carcinogenesis. However, the expression of FZD-3 in CRC is not clear. Therefore in this study, we examined the expression of FZD-3 in CRC cell lines and CRC patient tissues with various pathological stages. The information obtained will be important for us to understand the role of FZD-3 in the development of CRC. Methods: FZD-3 mRNA expression was studied in CRC metastatic SW620, primary SW480 and normal CCD18co cell lines using quantitative real-time polymerase chain reaction with primers and a Taqman minor grove binder probe (Applied Biosystems, Foster City, USA). Moreover, paraffin-embedded specimens of 40 CRC patient tissues, 25 colorectal adenoma (CA) tissues were retrieved from the Department of Pathology, Queen Elizabeth Hospital, Hong Kong Special Administrative Region for FZD-3 immunostaining using an anti-FZD-3 antibody (Catalog no: MAB1001, R&D systems Inc., Minneapolis, USA) in an automatic Ventana Benchmark XT immunostainer (Ventana Medical Systems Inc., Tucson, USA). Results: FZD-3 mRNA was up-regulated in metastatic SW620 cell line (fold-change: 622) and in primary SW480 cell line (fold-change: 820) when compared to that in normal CCD18co cell line. Furthermore, immunostaining showed that FZD-3 protein was expressed in 100% (40/40) of CRC specimens and 84% (21/25) of CA specimens. Detailed analysis showed that FZD-3 protein was significantly up-regulated in CRC, CA when compared to their adjacent normal colorectal epithelial tissues (p < 0.0005, Wilcoxon matched pairs test). Conclusions: This study provided evidence that FZD-3 is involved in CRC carcinogenesis and it is a potential therapeutic target in CRC. No significant financial relationships to disclose.
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Perilli E, Le V, Ma B, Salmon P, Reynolds K, Fazzalari NL. Detecting early bone changes using in vivo micro-CT in ovariectomized, zoledronic acid-treated, and sham-operated rats. Osteoporos Int 2010; 21:1371-82. [PMID: 19809776 DOI: 10.1007/s00198-009-1082-z] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2009] [Accepted: 09/09/2009] [Indexed: 10/20/2022]
Abstract
SUMMARY This study monitored in vivo the effect on bone microarchitecture of initiating antiresorptive treatment with zoledronic acid in rats at 2 weeks following ovariectomy, an early phase at which major degenerative bone changes have been found to occur. The treatment still facilitated the full reversal of cancellous bone loss in rat tibia, highlighting the importance of the time point of initiation of antiresorptive treatment. INTRODUCTION Injection of zoledronic acid in rats at time of ovariectomy has been found to fully preserve tibial bone microarchitecture over time, whereas injection at 8 weeks after ovariectomy has shown partial bone recovery. This study investigated the effect on microarchitecture of initiating antiresorptive treatment in the early phase following ovariectomy, at 2 weeks, a time point at which major degenerative changes in the bone have been found to occur. METHODS Female Sprague-Dawley rats were divided into ovariectomized group, ovariectomized group treated with zoledronic acid, and sham-operated group. In vivo micro-CT scanning of rat tibiae and morphometric analysis were performed at 0, 2, 4, 8, and 12 weeks after ovariectomy, with zoledronic acid treatment beginning 2 weeks after ovariectomy. Data were first analyzed with repeated measures analysis of variance (longitudinal study design) and then without repeated measures (cross-sectional study design). RESULTS The ovariectomized group demonstrated dramatic bone loss, first detected at week 2. Conversely, at week 4, the zoledronic acid-treated group returned microstructural parameters to baseline values. Remarkable increases in bone parameters were found after 6 weeks of treatment and maintained similar to sham group until the end. The longitudinal study design provided earlier detection of bone changes compared to the cross-sectional study design. CONCLUSIONS Treatment with zoledronic acid as late as 2 weeks after ovariectomy still facilitates the full reversal of cancellous bone loss in the rat tibia.
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Zhao G, Gao P, Yang KH, Tian JH, Ma B. Capecitabine/oxaliplatin as first-line treatment for metastatic colorectal cancer: a meta-analysis. Colorectal Dis 2010; 12:615-23. [PMID: 19486086 DOI: 10.1111/j.1463-1318.2009.01879.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
OBJECTIVE A meta-analysis of randomized controlled trials (RCT) was carried out to determine the efficacy and safety of capecitabine plus oxaliplatin (CAPOX) or fluorouracil plus oxaliplatin (FUOX) as first-line treatment for metastatic colorectal cancer (MCRC). METHOD A literature search was conducted of the Cochrane Controlled Trials Register Databases, Medline, Embase, ISI databases and Chinese Biomedical Literature Database without exclusion of material published in any language. RCTs conducted between 1998 and 2008 of CAPOX compared with FUOX regimens were considered for inclusion. Statistical analyses were carried out using RevMan software. RESULTS Ten RCTs were included, involving 3208 patients. The meta-analysis showed that there were no statistically significant differences in tumour response rate (RR, 0.93; 95% CI, 0.87-1.01; P = 0.09), progression-free survival (PFS) (RR, 0.98; 95% CI, 0.94-1.01; P = 0.19), and overall survival (OS) (RR, 1.02; 95% CI, 0.97-1.07; P = 0.47) between CAPOX and FUOX regimen. However, symptoms of thrombocytopenia and hand-foot syndrome (HFS) were increased in the CAPOX regimen (RR, 1.89; 95% CI, 1.33-2.69; P = 0.0004 and RR, 3.40; 95% CI, 2.25-5.15; P < 0.00001 respectively), while neutropenia and leucopenia occurred more frequently in the FUOX regimen (RR, 0.29; 95% CI, 0.15-0.55; P = 0.0002 and RR, 0.41; 95% CI, 0.18-0.95; P = 0.04 respectively). CONCLUSION CAPOX was equivalent to FUOX in terms of tumour response rate, progression-free survival (PFS), and OS in first-line treatment for patients with MCRC, which may be considered as standard first-line treatment in patients with MCRC.
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Kam MK, Leung S, Yu K, King AD, Chau RM, Cheung K, Ma B, Hui EP, Ahuja AT, Chan AT. Long-term treatment outcome of nasopharyngeal carcinoma (NPC) using intensity-modulated radiotherapy (IMRT). J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.5582] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Teng YJ, Li YP, Wang JW, Yang KH, Zhang YC, Wang YJ, Tian JH, Ma B, Wang JM, Yan X. Bioengineered skin in diabetic foot ulcers. Diabetes Obes Metab 2010; 12:307-15. [PMID: 20380651 DOI: 10.1111/j.1463-1326.2009.01164.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
OBJECTIVE Bioengineered skin (BS) has been shown to play an important role in the treatment of diabetic foot ulcers (DFUs). Whether BS in the therapy of DFU can improve the outcomes still remains uncertain. We performed a quantitative meta-analysis of available randomized controlled trials to determine the effectiveness and safety of BS in the treatment of patients with DFUs. DESIGN AND METHODS Comprehensive search strategies of various electronic databases were used for this study to evaluate the effectiveness and safety between BS and conventional treatment (CT) in patients with DFU, and only randomized controlled trials were adopted in our review. Search terms included 'bioengineered skin', 'tissue-engineering skin', 'human-tissue graft', 'human-skin device', 'living-skin equivalent' and 'diabetic foot', 'diabetic ulcer', 'diabetic wound'. Analysis outcomes included complete wound closure, complications, ulcer recurrence and adverse severe events (ASEs). RESULTS Seven randomized controlled trials on BS vs. CT were included, and 880 participants met inclusion criteria. Pooled analysis showed a significant effectiveness and safety advantages for BS treatment compared to CT for patients with DFUs. In analysis of complications, only statistically significant difference of infection was noted. And no included trials reported ASEs related to these treatments. CONCLUSIONS Based on the meta-analysis, patients with DFUs may benefit from the BS because of its high effectiveness and safety and reduced risk for infections in comparison to CT.
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Drymiotis F, Drye T, Rhodes D, Zhang Q, Lashey JC, Wang Y, Cawthorne S, Ma B, Lindsey S, Tritt T. Glassy thermal conductivity in the two-phase Cu(x)Ag(3-x)SbSeTe(2) alloy and high temperature thermoelectric behavior. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:035801. [PMID: 21386296 DOI: 10.1088/0953-8984/22/3/035801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We have measured the thermal transport properties over the temperature range 1.8 K<T<700 K of a two-phase alloy synthesized by reacting AgSbTe(2) and Ag(2)Se in a 1:1 molar ratio. Typical electrical resistivity values at 700 K are in the range ∼4 mΩ cm≤ρ≤20 mΩ cm, while low thermal conductivity values (κ<1 W m(-1) K(-1)) were obtained. We find that the thermal conductivity of this crystalline alloy has a temperature dependence strikingly similar to those of amorphous solids. In addition the thermal conductivity, thermopower, and electrical resistivity decouple. This result makes it possible to optimize thermoelectric performance by minimizing the electrical resistivity. It is therefore envisaged that this system has potential as a high performance bulk thermoelectric.
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Ma B, Uddin W. Fitness and Competitive Ability of an Azoxystrobin-Resistant G143A Mutant of Magnaporthe oryzae from Perennial Ryegrass. PLANT DISEASE 2009; 93:1044-1049. [PMID: 30754372 DOI: 10.1094/pdis-93-10-1044] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Development of azoxystrobin resistance in Magnaporthe oryzae from perennial ryegrass has been reported in certain locations in the United States, and possible development of resistance in additional areas is a major concern in the golf course industry. The study was undertaken to evaluate the relative fitness and competitive ability of a field-collected azoxystrobin-resistant G143A mutant by comparing it with a wild-type strain using detached perennial ryegrass blades. A fitness comparison experiment indicated that the disease severity of the wild-type strain was significantly higher than that of the mutant; however, the mutant produced greater secondary inoculum. When inoculated with three mixed populations of resistant and wild-type strains at different ratios, the production of conidia by the wild-type strain increased and that of the mutant decreased after infection occurred in all three populations tested. In an experiment on the effect of various fungicides on the population initially containing 5% of the mutant, preventive application of azoxystrobin allowed 5% of the mutant to dominate the population after the infection. However, other non-quinone outside inhibitor fungicides and mixtures of azoxystrobin with contact fungicides eliminated the entire mutant. This study demonstrates that the wild-type strain of M. oryzae has a competitive advantage over the mutant within the environment tested. Mixtures and alternations of fungicides with different modes of actions may prevent rapid build-up of resistance in the gray leaf spot pathosystem.
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Li Y, Ma B, Hu J, Zhao K. Numerical Simulation of the Hydrodynamics of Gas/Solid Two-Phase Flow in a Circulating Fluidized Bed with Different Inlet Configurations. Chem Eng Technol 2009. [DOI: 10.1002/ceat.200800455] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Frentzas SN, Groves MD, Barriuso J, Harris D, Reardon D, Curtis MC, Suttle AB, Ma B, Lager JJ, de Bono JS. Pazopanib and lapatinib in patients with relapsed malignant glioma: Results of a phase I/II study. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.2040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
2040 Background: Pazopanib (paz) is an oral angiogenesis inhibitor targeting VEGFR, PDGFR, and c-kit; and lapatinib (lap) is an oral tyrosine kinase inhibitor of EGFR (ErbB1) and HER-2 (ErbB2). Combination of VEGFR, PDGFR, and ErbB1 inhibitors may provide synergistic antitumor activity in malignant glioma. Phase I determined the optimally tolerated regimen (OTR) of paz and lap when given with enzyme-inducing anticonvulsants (EIACs). Phase II, which evaluated the efficacy of daily paz/lap (400 mg/1000mg) in relapsed grade 4 glioma without EIACs, was previously reported. Methods: Patients (pts) with grade 3 or 4 glioma, on EIACs, and with adequate organ function were eligible. Doses of paz and lap were escalated in a 3 + 3 design. OTR was defined as the highest dose of paz/lap at which no more than 1 of 6 pts had dose limiting toxicity (DLT) and target concentrations were achieved. Results: 32 pts have been enrolled at doses of paz/lap (mg, daily unless specified) of 200/1500 (N = 4), 800/1500 (N = 6), 800/500 bid (N = 5), 800/750 bid (N = 7), 800/1000 bid (N = 6), and 600 bid/1000 bid (N = 4). Data on 28 pts: the most common adverse events (AEs) were: fatigue (25%); diarrhea (25%); headache (21%); ALT increase (18%); nausea (18%); and insomnia (14%). Hepatobiliary lab abnormalities were reversible, uncomplicated, and included: AST elevation (11%), hyperbilirubinemia (7%), ALT elevation (36%; 7% Gr 3), and Alk phos elevation (14%). DLTs were elevated liver enzymes (800/1500; 1 pt), elevated lipase (800/750 bid; 1 pt) and thrombocytopenia, fatigue, diarrhea, confusion (800/1000 bid; 1 pt). 2 pts dose reduced and 3 pts had a dose interruption. At 600 bid/1000 bid, the target paz Cmin of 17.5 μg/mL was achieved; median lap Cmin of 0.447 μg/mL approached the target of 0.5 μg/mL. Phase I best response (MacDonald criteria) was PR in 3 pts (11%) and SD ≥ 8 weeks in 5 pts (18%). Two pts remain on the phase II, at 21 months (PR) and 23 months (CR) of therapy. Conclusions: The paz/lap combination has a manageable safety profile with a preliminary OTR with EIACs of paz 600 mg bid/ lap 1000 mg bid. EIACs decreased plasma paz and lap concentrations. Responses and lengthy periods without disease progression were seen in some pts in phase I and II. [Table: see text]
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Yeo W, Mo FK, Hui EP, Lam KC, Ho WM, Koh J, Ma B, Mok T, Chan A, Chan SL. Does severity of underlying chronic liver disease (CLD) affect treatment outcome of hepatocellular carcinoma (HCC) patients undergoing systemic chemotherapy (CT)? J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.e15513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e15513 Background: HCC is a common cause of morbidity and mortality. CT has been one of the treatments offered to patients (pts) who are not candidate of curative surgery. Treatment of HCC could be complicated by underlying CLD. In this study, we aimed to assess pre-CT severity of CLD on treatment outcome of HCC pts who were entered into our previously reported phase III prospective randomized CT study (J Natl Cancer Inst 2005). Methods: The severity of CLD for each pt was arbitrary assessed by adopting the Child-Pugh's classification. Patients’ characteristics were compared. Treatment outcomes in terms of responses, survival and treatment-related toxicities (NCI CTC) were compared. Results: 160 were Child's A; 28 were Child's B. Proportion of pts with cirrhosis (45% vs 71%, P=0.01) and pre-CT bilirubin level (11 vs. 15 umol/l, p=0.02) were significantly higher, while age (52 vs 45 yrs, p=0.05) and albumin level (35 vs 30 g/l, p<0.0001) were significantly lower among Child's B pts. For Child's A and B pts: the median no. of CT cycles received were 4.0 vs 2.5 (p=0.01), the response rates were 17% vs 8.3% (p=0.28), the median survival were 21 vs 10.7 months (p= 0.002). When toxicity during CT were compared, Child's B pts had significantly higher rate of grade 3/4 neutropenia (0.6% vs. 7.1%, p=0.05), hyperbilirubinaemia (11.9% vs. 28.6%, p=0.02), hyponatremia (3.1% vs. 3.6%, p=0.001) and gastrointestinal bleeding (3.1% vs. 17.9%, p=0.001). Conclusions: Child's B HCC pts experienced increased treatment-related toxicities during CT. This has probably led to a shorter duration of CT and a lower response rate to CT. Their shorter survival could also be attributed to the severity of underlying CLD. Future trials on systemic therapy in HCC patients may need to consider stratifying patients according to severity of CLD. No significant financial relationships to disclose.
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Zhang GY, Yi CG, Li X, Ma B, Li ZJ, Chen XL, Guo SZ, Gao WY. Troglitazone suppresses transforming growth factor-beta1-induced collagen type I expression in keloid fibroblasts. Br J Dermatol 2008; 160:762-70. [PMID: 19120328 DOI: 10.1111/j.1365-2133.2008.08989.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND Peroxisome proliferator-activated receptor (PPAR)-gamma agonists are increasingly used in patients with diabetes and some studies have suggested a beneficial effect on organ fibrosis. However their effects on dermal fibrosis in keloids are unknown. OBJECTIVE To investigate the effect of the PPAR-gamma agonist troglitazone on transforming growth factor (TGF)-beta1-induced collagen type I expression in keloid fibroblasts. METHODS Keloid fibroblasts were cultured and exposed to different concentrations of troglitazone in the presence of TGF-beta1. The mRNA expression of PPAR-gamma was determined by semiquantitative reverse transcriptase-polymerase chain reaction. The protein of PPAR-gamma, Smad2, Smad3, phoshpo-Smad2/3 and collagen type I was determined by Western blotting and collagen synthesis was evaluated by measuring (3)H-proline incorporation. The effect of troglitazone on cell viability was evaluated by the colorimetric conversion of 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide. RESULTS PPAR-gamma was expressed at a moderate level in keloid fibroblasts. Troglitazone depressed TGF-beta1-stimulated collagen type I expression and collagen synthesis in keloid fibroblasts in a concentration-dependent manner. Moreover, troglitazone inhibited expression and phosphorylation of TGF-beta1-induced Smad2/3. Cell viability was unaffected. These inhibitory effects of troglitazone were reversed by the PPAR-gamma-specific antagonist GW9662. CONCLUSIONS Our data suggest that PPAR-gamma is present in keloid fibroblasts and PPAR-gamma activation inhibits TGF-beta1-induced collagen type I expression at least in part by decreasing collagen synthesis. PPAR-gamma may be a promising therapeutic target for keloids.
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Glasner JD, Marquez-Villavicencio M, Kim HS, Jahn CE, Ma B, Biehl BS, Rissman AI, Mole B, Yi X, Yang CH, Dangl JL, Grant SR, Perna NT, Charkowski AO. Niche-specificity and the variable fraction of the Pectobacterium pan-genome. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2008; 21:1549-1560. [PMID: 18986251 DOI: 10.1094/mpmi-21-12-1549] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We compare genome sequences of three closely related soft-rot pathogens that vary in host range and geographical distribution to identify genetic differences that could account for lifestyle differences. The isolates compared, Pectobacterium atrosepticum SCRI1043, P. carotovorum WPP14, and P. brasiliensis 1692, represent diverse lineages of the genus. P. carotovorum and P. brasiliensis genome contigs, generated by 454 pyrosequencing ordered by reference to the previously published complete circular chromosome of P. atrosepticum genome and each other, account for 96% of the predicted genome size. Orthologous proteins encoded by P. carotovorum and P. brasiliensis are approximately 95% identical to each other and 92% identical to P. atrosepticum. Multiple alignment using Mauve identified a core genome of 3.9 Mb conserved among these Pectobacterium spp. Each core genome is interrupted at many points by species-specific insertions or deletions (indels) that account for approximately 0.9 to 1.1 Mb. We demonstrate that the presence of a hrpK-like type III secretion system-dependent effector protein in P. carotovorum and P. brasiliensis and its absence from P. atrosepticum is insufficient to explain variability in their response to infection in a plant. Additional genes that vary among these species include those encoding peptide toxin production, enzyme production, secretion proteins, and antibiotic production, as well as differences in more general aspects of gene regulation and metabolism that may be relevant to pathogenicity.
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Solvignon P, Liyanage N, Chen JP, Choi S, Aniol K, Averett T, Boeglin W, Camsonne A, Cates GD, Chang CC, Chudakov E, Craver B, Cusanno F, Deur A, Dutta D, Ent R, Feuerbach R, Frullani S, Gao H, Garibaldi F, Gilman R, Glashausser C, Gorbenko V, Hansen O, Higinbotham DW, Ibrahim H, Jiang X, Jones M, Kelleher A, Kelly J, Keppel C, Kim W, Korsch W, Kramer K, Kumbartzki G, Lerose JJ, Lindgren R, Ma B, Margaziotis DJ, Markowitz P, McCormick K, Meziani ZE, Michaels R, Moffit B, Monaghan P, Munoz Camacho C, Paschke K, Reitz B, Saha A, Sheyor R, Singh J, Slifer K, Sulkosky V, Tobias A, Urciuoli GM, Wang K, Wijesooriya K, Wojtsekhowski B, Woo S, Yang JC, Zheng X, Zhu L. Quark-hadron duality in neutron (3He) spin structure. PHYSICAL REVIEW LETTERS 2008; 101:182502. [PMID: 18999823 DOI: 10.1103/physrevlett.101.182502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2008] [Indexed: 05/27/2023]
Abstract
We present experimental results of the first high-precision test of quark-hadron duality in the spin-structure function g_{1} of the neutron and 3He using a polarized 3He target in the four-momentum-transfer-squared range from 0.7 to 4.0 (GeV/c);{2}. Global duality is observed for the spin-structure function g_{1} down to at least Q;{2}=1.8 (GeV/c);{2} in both targets. We have also formed the photon-nucleon asymmetry A1 in the resonance region for 3He and found no strong Q2 dependence above 2.2 (GeV/c);{2}.
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Simpson AL, Ma B, Slagel B, Borschneck DP, Ellis RE. Computer-assisted distraction osteogenesis by Ilizarov's method. Int J Med Robot 2008; 4:310-20. [DOI: 10.1002/rcs.211] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Prueksaritanont T, Hochman JH, Meng Y, Pudvah NT, Barrish A, Ma B, Yamazaki M, Fernandez-Metzler C, Lin JH. Renal elimination of a novel and potent αvβ3integrin antagonist in animals. Xenobiotica 2008; 34:1059-74. [PMID: 15801548 DOI: 10.1080/00498250400015277] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Compound A (3-{2-oxo-3-[3-(5,6,7,8-tetrahydro-[1,8]napthyridin-2-yl)propyl]-imidazolidin-1-yl}-3(S)-(6-methoxy-pyridin-3-yl)propionic acid), a hydrophilic zwitter-ion, is a potent and selective alphavbeta3 integrin antagonist currently under clinical development for the treatment of osteoporosis. The mechanism of renal excretion of compound A was investigated using a combination of in vivo and in vitro approaches. In rats, renal excretion of compound A involved tubular secretion; ratios between renal clearance, corrected for unbound fraction in plasma (CLr,u) and glomerular filtration rate (GFR) were greater than unity (2-5). The tubular secretion of compound A was saturable at high plasma levels (> 26 microM), and was inhibited significantly, although modestly (about twofold) by relatively high plasma concentrations of the organic anion PAH (160 microM) and the cation cimetidine (about 400 microM), but not by the P-gp inhibitor quinidine (about 50 microM). However, compound A (about 100 microM) had a minimal effect on CLr/GFRs for cimetidine and PAH. In rhesus monkeys, renal elimination of compound A also involved tubular secretion, with a CLr,u/GFR ratio of about 30. The renal secretion of compound A was not affected by either cimetidine (about 120 microM) or PAH (about 80 microM). Similarly, compound A (about 40 microM) had a minimal effect on the renal tubular secretion of both cimetidine and PAH. At the doses studied, neither rat nor monkey plasma protein binding of compound A, cimetidine or PAH was affected in the presence of each other. In vitro transport studies showed that compound A was not a substrate for P-gp in the Caco-2, human MDR1 and mouse mdr1a transfected LLC-PK1 cell lines. In an uptake study using rOAT1 and rOAT3 transfected HEK cell lines, compound A was shown to be a substrate for rat OAT3 (Km= 15 microM), but not rat OAT1. The results suggest that the tubular secretion of compound A is not mediated by P-gp, but rather is mediated, at least in part, via the organic anion transporter OAT3, the renal transporter shown to be capable of transporting both the organic anion PAH and the organic cation cimetidine. Although there is a possibility for pharmacokinetic interactions between compound A and substrates or inhibitors of OAT3, at the renal excretion level, the magnitude of interaction would likely be modest in humans at clinically relevant doses.
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Tang J, Zeng W, Wang W, Ma B, Liu Y, Li H, Xia H, Li P, Zhu L. Genetic analysis and gene mapping of a rice few-tillering mutant in early backcross populations (Oryza sativa L.). SCIENCE IN CHINA. SERIES C, LIFE SCIENCES 2008; 44:570-5. [PMID: 18763097 DOI: 10.1007/bf02879350] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2001] [Indexed: 11/28/2022]
Abstract
A rice mutant, G069, characteristic of few tiller numbers, was found in anther culture progeny from the F(1) hybrid between an indica-japonica cross, Gui630x02428. The mutant has another two major features: delayed tillering development and yellowing apex and margin on the mature leaves. As a donor parent, G069 was further backcrossed with the recurrent parent,02428, for two turns to develop aBC (2)F(2) population. Genetic analysis in the BC (2)F(2) population showed that the traits of few-tillering and yellowing apex and margin on the mature leaves were controlled by one recessive gene. A pool of equally mixed genomic DNA, from few-tillering individual plants in BC (2)F(2), was constructed to screen polymorphism with simple sequence repeat (SSR) markers in comparison with the 02428 genome. One SSR marker and three restriction fragment length polymorphism (RFLP) markers were found possibly linked with the recessive gene. By using these markers, the gene of few-tillering was mapped on chromosome 2 between RFLP marker C424 and S13984 with a genetic distance of 2.4 cM and 0.6 cM, respectively. The gene is designated ft1.
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Guan J, Chan M, Ma B, Grenier C, Wilkie DC, Pasick J, Brooks BW, Spencer JL. Development of methods for detection and quantification of avian influenza and Newcastle disease viruses in compost by real-time reverse transcription polymerase chain reaction and virus isolation. Poult Sci 2008; 87:838-43. [PMID: 18420973 DOI: 10.3382/ps.2007-00195] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Composting has been used for disposal of poultry carcasses and manure following outbreaks caused by avian influenza virus (AIV) and Newcastle disease virus (NDV), but methods are needed to test for survival of the viruses in compost to ensure biosecurity. Methods developed in the present study include extracting viruses from compost and purifying viral RNA. The extracted viruses were detected by virus isolation using embryonated chicken eggs, and the purified RNA was detected by real-time reverse transcription PCR (RRT-PCR). The virus isolation and the RRT-PCR methods were evaluated with 3 compost preparations that were produced from chicken manure mixed with corn silage, wood shavings, or wheat straw. The detection limits of both methods were 1,700 and 1,000 embryo lethal doses of AIV and NDV per gram of compost, respectively. The copy number of viral RNA quantified by RRT-PCR was highly correlated with the amount of virus in compost. The results suggested that the RRT-PCR method may be used as an alternative to the virus isolation method for rapid detection and accurate quantification of AIV and NDV in compost.
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Yang S, Yang K, Li Y, Zhang Y, He X, Song A, Tian J, Jiang L, Bai Z, He L, Liu Y, Ma B. Breast conservation therapy for stage I or stage II breast cancer: a meta-analysis of randomized controlled trials. Ann Oncol 2008; 19:1039-44. [DOI: 10.1093/annonc/mdm573] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
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Costacou T, Ma B, King IB, Mayer-Davis EJ. Plasma and dietary vitamin E in relation to insulin secretion and sensitivity. Diabetes Obes Metab 2008; 10:223-8. [PMID: 18269637 DOI: 10.1111/j.1463-1326.2006.00683.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIM In the Insulin Resistance and Atherosclerosis Study (IRAS), we have previously shown a protective effect of plasma alpha-tocopherol concentration against diabetes incidence among persons not taking vitamin E supplements. The biologic mechanism for such a protective effect could involve improvement in either insulin sensitivity (S(I)), insulin secretion or both. Thus, we examined vitamin E in relation to insulin secretion and S(I) among persons not taking vitamin E supplements. METHODS This analysis included 457 adults aged 40-69 years without a previous diabetes diagnosis or vitamin E supplement use at baseline and seen at the 5-year follow-up examination. Baseline nutrient intake was estimated from a validated 1-year food frequency questionnaire; plasma levels of alpha-tocopherol were also assessed. At follow up, a frequently sampled intravenous glucose tolerance test determined S(I), acute insulin response to glucose (AIR), and the disposition index (DI) was calculated as the sum of the log-transformed AIR and S(I) to reflect pancreatic compensation for insulin resistance. RESULTS In multivariable regression analyses, no relationship was observed for vitamin E intake and either S(I), AIR or DI. However, plasma alpha-tocopherol concentration was positively associated with log-transformed S(I) (beta= 0.27 +/- 0.09, p < 0.01) and DI (beta= 0.41 +/- 0.14, p < 0.01), but not with log-transformed AIR. CONCLUSIONS Plasma concentration of alpha-tocopherol may improve S(I) and pancreatic compensation for insulin resistance, although it does not seem to be related to acute insulin response.
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Xiao S, Zhu S, Ma B, Xia ZF, Yang J, Wang G. A New System for Cultivation of Human Keratinocytes on Acellular Dermal Matrix Substitute with the Use of Human Fibroblast Feeder Layer. Cells Tissues Organs 2008; 187:123-30. [DOI: 10.1159/000109947] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/27/2007] [Indexed: 01/08/2023] Open
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Kam M, Leung S, Kwan W, Chau R, Cheung K, Yu K, Chiu S, Ma B, Hui E, Chan A. Patterns of Local Failure Following Intensity-Modulated Radiotherapy for Nasopharyngeal Carcinoma: Predominance of Within-Field Failure. Int J Radiat Oncol Biol Phys 2007. [DOI: 10.1016/j.ijrobp.2007.07.1552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Yang K, Li J, Liu Y, Ma B, Roberts H, Tan J, Tian J, Wu T, Zhang P. Microwave therapy for cervical ectropion. Cochrane Database Syst Rev 2007; 2007:CD006227. [PMID: 17943899 PMCID: PMC8922973 DOI: 10.1002/14651858.cd006227.pub2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Cervical ectropion is considered as one of the most common types of chronic cervicitis in China. Topical treatments for cervical ectropion including microwave tissue coagulation, are widely used in many hospitals in China. Nowadays, the necessary intervention for inflammatory cervical ectopy is controversial. OBJECTIVES To compare the efficacy and potential side effects of microwave tissue coagulation with other interventions or no intervention in the treatment of cervical ectropion. SEARCH STRATEGY We searched the Cochrane Menstrual Disorders and Subfertility Group Trials Register, Cochrane Central Register of Controlled Trials (CENTRAL, The Cochrane Library 2006, Issue 1), MEDLINE (1966 to 2005), EMBASE (1974 to 2005); The Chinese Biomedical Database (CBM, 1978 to 2005), The Chinese Medical Current Contents (CMCC, 1994 to 2005), CAJ Full-text Database (1994 to 2005) and Chinese Scientific Journals Database (1989 to 2005). We also searched related literature on the Internet with search engines such as Google, searched the reference lists of articles and hand searched relevant Chinese journals. SELECTION CRITERIA Only authentic randomized controlled trials (RCTs) were included. DATA COLLECTION AND ANALYSIS Two authors independently interviewed the original authors of claimed RCTs published in China and then assessed the quality of the three included RCTs and extracted data. MAIN RESULTS No studies were found that met the participant inclusion criteria of the protocol. Although three studies were identified as authentic RCTs from 92 potential RCTs, it was not possible to confirm that the participants were symptomatic prior to treatment. Of these three studies two trials compared microwave therapy with laser and one compared microwave therapy with interferon-alpha suppository therapy. Microwave therapy showed a better effect on cervical appearance over laser therapy in the women with grade II and III and also improved cervical appearance over interferon-alpha suppository therapy. There was no difference in grade I women. Microwave therapy showed less adverse bleeding than laser therapy during the treatment. However, the methodological quality of the three RCTs was generally low. No trial compared treatment to no intervention and most trials didn't assess relief of symptoms or quality of life and satisfaction, which are very important to women. AUTHORS' CONCLUSIONS There are no RCTs comparing microwave therapy with other treatments or no treatment in symptomatic women with cervical ectropion. Although microwave therapy improved the appearance of the cervix over both laser therapy and interferon-alpha suppository therapy it is not clear if there is any other benefit for women.
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Ma B, von Wasielewski R, Lindenmaier W, Dittmar KEJ. Immmunohistochemical study of the blood and lymphatic vasculature and the innervation of mouse gut and gut-associated lymphoid tissue. Anat Histol Embryol 2007; 36:62-74. [PMID: 17266671 DOI: 10.1111/j.1439-0264.2006.00741.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The blood and lymphatic vascular system of the gut plays an important role in tissue fluid homeostasis, nutrient absorption and immune surveillance. To obtain a better understanding of the anatomic basis of these functions, the blood and lymphatic vasculature of the lower segment of mouse gut and several constituents of gut-associated lymphoid tissue (GALT) including Peyer's patch, specialized lymphoid nodules in the caecum, small lymphoid aggregates and lymphoid nodules in the colon were studied by using confocal microscopy. Additionally, the innervation and nerve/immune cell interactions in the gut and Peyer's patch were investigated by using cell surface marker PGP9.5 and Glial fibrillary acidic protein (GFAP). In the gut and Peyer's patch, the nerves have contact with B cell, T cell and B220CD3 double-positive cells. Dendritic cells, the most important antigen-presenting cells, were closely apposed to some nerves. Some dendritic cells formed membrane-membrane contact with nerve terminals and neuron cell body. Many fine nerve fibres, which are indirectly detected by GFAP, have contact with dendritic cells and other immune cells in the Peyer's patch. Furthermore, the expression of Muscarinic Acetylcholine receptor (subtype M2) was characterized on dendritic cells and other cell population. These findings are expected to provide a route to understand the anatomic basis of neuron-immune regulation/cross-talk and probably neuroinvasion of prion pathogens in the gut and GALT.
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Ma B, Tan EH, Mok T, Lam KC, Soo R, Leong SS, Wang LZ, Mo F, Chan AT, Goh BC. High incidence of symptomatic methemoglobinemia (metHb) in Asian patients (pts) treated with 3-Aminopyridine-2-carboxaldehyde thiosemicarbazone (3-AP, triapine) and gemcitabine (GEM) in a second-line phase II trial of metastatic non-small cell lung cancer. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.18207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
18207 Background: Triapine (Vion Pharmaceuticals) is an inhibitor of ribonucleotide reductase that can enhance GEM uptake in GEM- resistant cell lines. Clinically significant metHb has been rarely reported with triapine & G6PD-deficient pts maybe more susceptible. This multicenter study evaluated the activity & safety of combined triapine-GEM in pts with metastatic NSCLC who had progressed despite prior response or disease stabilization to 1st line platinum-GEM regimen. Methods: Eligible pts were treated with triapine (105mg/m2) as 4-hr IV infusion, followed by GEM (1g/m2) over 30-min on days 1, 8 & 15, repeating every 28 days for 6 cycles. G6PD-deficient pts were excluded. Results: 6 males & 6 female Asian pts (median age: 65 yrs) received a median no. of 2 cycles (range 1–6 cycles). At a median follow-up of 4.6 mos, no response was seen. 4 pts had stable disease. Median time to progression was 3 mos (95% CI: 1.7–9.1 mos). Gr 3–4 toxicities included neutropenia (gr 3, 2 pts), hypoxia (gr 3, 3 pts) & dyspnea (gr 3, 1 pt). There were no treatment-related deaths & all pts remained alive at analysis. 4 pts developed symptomatic metHb during, or ≤ 4 hrs of stopping triapine. This was manifested as dyspnea &/or hypoxia, associated with an oxygen saturation of ≤90% at room air. Arterial metHb assay performed during the hypoxic episode showed a metHb level of up to 15% of total concentration of hemoglobin ([Hb]), which fell to < 5% of [Hb] within 4–6 hrs of stopping triapine. All pts recovered with conservative treatment & none required reversal with methylene blue. 3 out of the 4 pts were able to continue treatment after dose-reduction of triapine. Conclusions: The cause of the relatively high incidence of triapine-related symptomatic metHb was unclear in this Asian cohort. This study was terminated prematurely due to lack of response. No significant financial relationships to disclose.
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Chan AT, Ma B, Tung S, Hui EP, Yuen KK, King A, Leung SF, Chan I, Chan M, Zee B. Biweekly gemcitabine and oxaliplatin (GEMOX) in first-line metastatic or recurrent nasopharyngeal carcinoma (NPC)—An early report. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.6071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
6071 Background: This multicenter phase II study evaluated the activity & safety of oxaliplatin (Ox), a 3rd generation platinum, in combination with gemcitabine (GEM) for the first time in the palliative setting for patients (pts) with undifferentiated/ poorly differentiated NPC. Methods: Pts with untreated metastatic (M1) or locoregionally recurrent (LR) NPC were treated with a biweekly ‘GEMOX’ regimen (D1: GEM, 1,000 mg/m2 at 10 mg/m2/min; D2: Ox, 100 mg/m2 over 2 hrs) for a max. of 12 cycles. Intrapatient dose escalation of GEM to 1,250 mg/m2 was allowed from cycle 2 onwards if no significant toxicity occurred in cycle 1. Response was assessed every 4 cycles (RECIST criteria). Results: 23 pts accrued before 31st July 06 were evaluated for toxicity & response; cut-off date for data analysis was 15th Oct 06. The median age was 53 yrs (range 38–72); 19 were men, all had ECOG status of 0–1. At enrolment, 7 pts (29%) had M1 disease only, 3 (12%) pts had LR only, & the rest both M1 & LR. All 7 pts with only LR received radical radiotherapy (RT) at initial diagnosis. A median of 11 cycles (range 3–13) were administered. Best overall response rate was 52%, with 12 partial responses & 11 stable diseases. The median duration of response was 7 months (range 0.8–15). Grade (gr) 3–4 hematological toxicities (CTCAE ver 3) included neutropenia in 7 pts (30%, only 1 pt had fever), thrombocytopenia in 5 pts (26%, 1 gr 4 case with mild gum bleeding). Gr 3–4 non-hematological toxicities included gr 3 diarrhoea in 2 pts, gr 4 Ox-related hypersensitivity reaction in 1 pt, gr 3 epistaxis in 2 pts. The commonest non-hematological toxicities were gr 1–2 Ox-related sensory neuropathy (22pts). There were no treatment-related deaths & only 1 pt withdrew from study due to drug-related toxicity. Conclusions: GEMOX is a promising regimen among pts with metastatic & recurrent NPC. Accrual is ongoing with a planned total sample of 40 pts. No significant financial relationships to disclose.
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Lu Y, Ma B, Guo R, Wang Y, Zhang J, Wu Y, Pang G, Xin J, Ye W, Zou Y, Wang X, Hitos K, Curtin P, Fletcher J. Deep vein thrombosis in trauma: a prospective study of lower limb orthopedic trauma patients in Tianjin Hospital, China. INT ANGIOL 2007; 26:165-70. [PMID: 17489081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
AIM Pulmonary embolism is a third leading cause of death in trauma patients. The prevalence of deep vein thrombosis (DVT) in Asian countries is considered to be less than in Western countries. Our aim was to establish the rate of DVT in orthopedic trauma patients in Tianjin Hospital, to identify DVT risk factors and to support the use of prophylaxis. METHODS Patients admitted between November 2003 and October 2004 with recent fracture had data collected prospectively to record type of fracture, mechanism of injury, history of DVT, blood transfusion requirements, operation details, extent of postoperative swelling, use of traction, immobilization, bandaging and patient positioning. Each patient had 3 duplex ultrasound examinations, the first within 24 h of admission. Patients requiring surgery had a second ultrasound within 2 days preoperatively, then 7 days postoperatively. Patients not requiring surgery had second and third ultrasound examinations 5 and 14 days after admission. RESULTS There were 547 patients, median age 39.6 years (interquartile range: 28-50 years). DVT developed in 12.4% (95% confidence interval: 9.7-15.2%), most occurring with femoral shaft fractures (30.6%), 15.8% occurred with hip fractures, 14.5% with fractures around the knee and 10.8% with fractured tibia and fibula. Over half of DVTs (56.7%) developed within 3 days following injury. CONCLUSION The incidence of DVT in Chinese orthopedic trauma patients approaches that in Western countries. Guidelines for DVT prophylaxis should be applied in China as in Western countries.
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Keskin O, Gursoy A, Ma B, Nussinov R. Towards Drugs Targeting Multiple Proteins in a Systems Biology Approach. Curr Top Med Chem 2007; 7:943-51. [PMID: 17508925 DOI: 10.2174/156802607780906690] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Protein-protein interactions are increasingly becoming drug targets. This is understandable, since they are crucial at all levels of cellular expression and growth. In practice, targeting specific disease-related interactions has proven difficult, with success varying with specific complexes. Here, we take a Systems Biology approach to targeting protein-protein interactions. Below, we first briefly review drug discovery targeted at protein-protein interactions; we classify protein-protein complexes with respect to their types of interactions and their roles in cellular function and as being targets in drug design; we describe the properties of the interfaces as related to drug design, focusing on hot spots and surface cavities; and finally, in particular, we cast the interactions into the cellular network system, highlighting the challenge of partially targeting multiple interactions in the networks as compared to hitting a specific protein-protein interaction target. The challenge we now face is how to pick the targets and how to improve the efficiency of designed partially-specific multi-target drugs that would block parallel pathways in the network.
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Ma B, Narayanan R, Park H, Hero AO, Bland PH, Meyer CR. Comparing pairwise and simultaneous joint registrations of decorrelating interval exams using entropic graphs. INFORMATION PROCESSING IN MEDICAL IMAGING : PROCEEDINGS OF THE ... CONFERENCE 2007; 20:270-82. [PMID: 17633706 PMCID: PMC2806228 DOI: 10.1007/978-3-540-73273-0_23] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
The interest in registering a set of images has quickly risen in the field of medical image analysis. Mutual information (MI) based methods are well-established for pairwise registration but their extension to higher dimensions (multiple images) has encountered practical implementation difficulties. We extend the use of alpha mutual information (alphaMI) as the similarity measure to simultaneously register multiple images. alphaMI of a set of images can be directly estimated using entropic graphs spanning feature vectors extracted from the images, which is demonstrated to be practically feasible for joint registration. In this paper we are specifically interested in monitoring malignant tumor changes using simultaneous registration of multiple interval MR or CT scans. Tumor scans are typically a decorrelating sequence due to the cycles of heterogeneous cell death and growth. The accuracy of joint and pairwise registration using entropic graph methods is evaluated by registering several sets of interval exams. We show that for the parameters we investigated simultaneous joint registration method yields lower average registration errors compared to pairwise. Different degrees of decorrelation in the serial scans are studied and registration performance suggests that an appropriate scanning interval can be determined for efficiently monitoring lesion changes. Different levels of observation noise are added to the image sequences and the experimental results show that entropic graph based methods are robust and can be used reliably for multiple image registration.
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Si S, Sun Y, Li Z, Ge W, Zhang X, Hu P, Huang Y, Chen G, Song H, Huang Y, Ma B, Li X, Sui Y. Gene therapy by membrane-expressed superantigen for α-fetoprotein-producing hepatocellular carcinoma. Gene Ther 2006; 13:1603-10. [PMID: 16855617 DOI: 10.1038/sj.gt.3302823] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Staphylococcus enterotoxin A (SEA) is a powerful immunostimulant, which can stimulate T cells bearing certain T-cell receptor beta-chain variable regions, when bound to major histocompatibility complex II molecules. In vivo administration of intact superantigen in sufficient therapeutic amounts risks unwanted cytotoxicity against normal cells. In this study, we used SEA fused with CD80 transmembrane region (named as SEAtm) driven by alpha-fetoprotein (AFP) enhancer/promoter to reduce toxicity and to improve safety and efficiency in the application of SEA. We demonstrated that SEAtm by adenovirus from the AFP enhancer/promoter (AdAFPSEA) could be expressed on the surface of AFP-producing cell line Hepa1-6 instead of non-AFP-producing cell lines. Hepa1-6 infected by recombinant adenovirus stimulated proliferation of splenocytes and activated CD4(+) and CD8(+) T cells in vitro. After AdAFPSEA was injected into the subcutaneously established hepatoma in vivo, the expression of SEA was detected in tumor tissues, which subsequently induced tumor-specific cytotoxic T cells in spleen. Moreover, hepatocellular carcinoma (HCC) xenografts were suppressed by treatment with AdAFPSEA and the survival time of treated mice was prolonged. These findings suggest that membrane-expressed SEA by adenovirus from AdAFPSEA can generate stronger local and systemic antitumor responses against HCC.
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Ma B, Forbes W, Venook AP, Bissell DM, Peterson C, Niculae I, Bullough D. A phase I/II study to assess the safety, tolerability and pharmacokinetics (PK) of intravenous (IV) infusion of MB07133 in subjects with unresectable hepatocellular carcinoma (HCC). J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.2054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
2054 Background: MB07133 is a novel cytarabine (araC) prodrug that uses the HepDirect technology to target production of the active form of araC, araC triphosphate (araCTP), to the liver. The study objectives were to determine the maximum tolerated dose, toxicity profile (NCI-CTC 2.0), PK & antitumor activity of MB07133 in patients (pts) with unresectable HCC. MB07133 was given as a continuous IV infusion at escalating doses during the first 7 days of a 28-day cycle until disease progression or unacceptable toxicity occurred. To date, 22 pts with Child-Pugh Class A liver function have been enrolled in 4 cohorts (300, 600, 1200, 1800 mg/m2/d, D1–7), with 3–6 pts/cohort. Enrolled pts had a median age of 57 yrs (range 20–67) & consisted of 21 males, 1 female, 19 Asians & 3 Caucasians. A total of 66 cycles have been administered (maximum 10 cycles in 1 pt) with no dose-limiting toxicities associated with therapy. Most drug-related toxicities (67%) were mild to moderate (gr 1–2 neutropenia, thrombocytopenia & increased ALT). There was 1 gr 3 ascites unrelated to study drug and no gr 4 toxicity. Six pts experienced 10 serious adverse events, all unrelated or unlikely related to study drug. The very low araC concentrations in the plasma (see table ) were consistent with previous animal studies, which demonstrated MB07133 to target araCTP production in the liver. 36% of pts who had ≥ 2 cycles of MB07133 had disease stabilization. Conclusions: MB07133 is well tolerated at doses up to 1800 mg/m2/d in pts with unresectable HCC. Enrollment of a 2400 mg/m2 cohort is ongoing. The disease stabilization observed in this study, although preliminary, warrants further investigation in Phase 2. [Table: see text] [Table: see text]
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Chan AT, Ma B, Hui EP, King A, Kam M, Kwan WH, Mok T, Leung SF. Phase II study of gefitinib in metastatic or locoregionally recurrent nasopharyngeal carcinoma (NPC). J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.15509] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
15509 Background: Our preclinical work has shown that epidermal growth factor receptor (EGFR) is expressed in ∼ 80% of undifferentiated NPC & gefitinib is a small molecule inhibitor against EGFR with anti-proliferative activity in NPC in vitro. Methods: We report the preliminary result of a phase II study of gefitinib in patients (pts) who progressed after 1–2 lines of chemotherapy (at least 1 line had to contain platinum) for metastatic or locoregionally recurrent NPC. Fourteen Chinese pts were accrued, of whom the median age was 48 years (range 34–64 years), 12 were males, 9 had metastatic & 5 had locoregionally recurrent NPC. All received gefitinib at 500mg/day orally, every 28 days with radiological assessment performed every 2 cycles for a maximum of 8 cycles. Ten pts had 1 line & 5 pts had 2 lines of prior chemotherapy. Results: The median number of administered cycles was 2 (range 1–8). Of the 14 pts evaluable for toxicity, the most commonly reported were acneiform rash (86%, grade 1–2, n = 10; grade 3, n = 4), dry skin (86%, grade 1–2), diarrhea (71%, grade 1–2), fatigue (64%, grade 1–2), anorexia (64%, grade 1–2) & nausea (20%, grade 2). Other grade 3–4 toxicities included fever (n = 2, skin cellulitis, infective pneumonia), hyponatremia (n = 2), near-syncope (n = 2), anemia (n = 1). Dose reduction to 250mg/day was required in 4 pts who encountered grade 3 skin rash. Of the 11 pts evaluable for response, 2 had stable disease (SD) for ≥ 6 months (m) (mean 6.8 m) 9 progressed and no partial responders. Five pts have died mostly of progressive disease & there were no treatment-related deaths. Conclusions: Gefitinib is well tolerated in pts with advanced NPC with some pts experiencing disease stabilization for over 6 months & study accrual is ongoing. No significant financial relationships to disclose.
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