1
|
Lee C, Tseng T, Chang R, Yen H, Chen Y, Chen Y, Wu C, Hu M, Yen M, Bongers M, Groot OQ, Lai C, Lin W. Psoas muscle area is an independent survival prognosticator in patients undergoing surgery for long-bone metastases. Cancer Med 2024; 13:e7072. [PMID: 38457220 PMCID: PMC10922028 DOI: 10.1002/cam4.7072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 02/02/2024] [Accepted: 02/20/2024] [Indexed: 03/09/2024] Open
Abstract
BACKGROUND Predictive analytics is gaining popularity as an aid to treatment planning for patients with bone metastases, whose expected survival should be considered. Decreased psoas muscle area (PMA), a morphometric indicator of suboptimal nutritional status, has been associated with mortality in various cancers, but never been integrated into current survival prediction algorithms (SPA) for patients with skeletal metastases. This study investigates whether decreased PMA predicts worse survival in patients with extremity metastases and whether incorporating PMA into three modern SPAs (PATHFx, SORG-NG, and SORG-MLA) improves their performance. METHODS One hundred eighty-five patients surgically treated for long-bone metastases between 2014 and 2019 were divided into three PMA tertiles (small, medium, and large) based on their psoas size on CT. Kaplan-Meier, multivariable regression, and Cox proportional hazards analyses were employed to compare survival between tertiles and examine factors associated with mortality. Logistic regression analysis was used to assess whether incorporating adjusted PMA values enhanced the three SPAs' discriminatory abilities. The clinical utility of incorporating PMA into these SPAs was evaluated by decision curve analysis (DCA). RESULTS Patients with small PMA had worse 90-day and 1-year survival after surgery (log-rank test p < 0.001). Patients in the large PMA group had a higher chance of surviving 90 days (odds ratio, OR, 3.72, p = 0.02) and 1 year than those in the small PMA group (OR 3.28, p = 0.004). All three SPAs had increased AUC after incorporation of adjusted PMA. DCA indicated increased net benefits at threshold probabilities >0.5 after the addition of adjusted PMA to these SPAs. CONCLUSIONS Decreased PMA on CT is associated with worse survival in surgically treated patients with extremity metastases, even after controlling for three contemporary SPAs. Physicians should consider the additional prognostic value of PMA on survival in patients undergoing consideration for operative management due to extremity metastases.
Collapse
Affiliation(s)
- Chia‐Che Lee
- Graduate Institute of Biomedical Electronics and BioinformaticsNational Taiwan UniversityTaipeiTaiwan
- Department of Orthopaedic SurgeryNational Taiwan University HospitalTaipeiTaiwan
| | - Ting‐En Tseng
- Department of Orthopaedic SurgeryNational Taiwan University HospitalTaipeiTaiwan
| | - Ruey‐Feng Chang
- Graduate Institute of Biomedical Electronics and BioinformaticsNational Taiwan UniversityTaipeiTaiwan
| | - Hung‐Kuan Yen
- Department of Orthopaedic SurgeryNational Taiwan University HospitalTaipeiTaiwan
- Department of Orthopaedic SurgeryNational Taiwan University HospitalHsinchuTaiwan
- Department of Medical EducationNational Taiwan University HospitalHsinchuTaiwan
| | - Yu‐An Chen
- Department of Medical EducationNational Taiwan University HospitalTaipeiTaiwan
| | - Yu‐Yung Chen
- Department of Medical EducationNational Taiwan University HospitalTaipeiTaiwan
| | - Chih‐Horng Wu
- Department of Medical ImagingNational Taiwan University HospitalTaipeiTaiwan
| | - Ming‐Hsiao Hu
- Department of Orthopaedic SurgeryNational Taiwan University HospitalTaipeiTaiwan
| | - Mao‐Hsu Yen
- Department of Computer Science and EngineeringNational Taiwan Ocean UniversityKeelungTaiwan
| | - Michiel Bongers
- Department of Orthopaedic SurgeryMassachusetts General HospitalBostonMassachusettsUSA
| | - Olivier Q. Groot
- Department of Orthopaedic SurgeryMassachusetts General HospitalBostonMassachusettsUSA
- Department of OrthopaedicsUniversity Medical Center UtrechtUtrechtThe Netherlands
| | - Cheng‐Yo Lai
- Department of Orthopaedic SurgeryNational Taiwan University HospitalHsinchuTaiwan
| | - Wei‐Hsin Lin
- Department of Orthopaedic SurgeryNational Taiwan University HospitalTaipeiTaiwan
| |
Collapse
|
2
|
Hsieh H, Yen H, Tseng T, Pan Y, Liao M, Fu S, Yen M, Jaw F, Lin W, Hu M, Yang S, Groot OQ, Schoenfeld AJ. Determining patients with spinal metastases suitable for surgical intervention: A cost-effective analysis. Cancer Med 2023; 12:20059-20069. [PMID: 37749979 PMCID: PMC10587930 DOI: 10.1002/cam4.6576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2023] [Revised: 09/04/2023] [Accepted: 09/12/2023] [Indexed: 09/27/2023] Open
Abstract
BACKGROUND Both nonoperative and operative treatments for spinal metastasis are expensive interventions. Patients' expected 3-month survival is believed to be a key factor to determine the most suitable treatment. However, to the best of our knowledge, no previous study lends support to the hypothesis. We sought to determine the cost-effectiveness of operative and nonoperative interventions, stratified by patients' predicted probability of 3-month survival. METHODS A Markov model with four defined health states was used to estimate the quality-adjusted life years (QALYs) and costs for operative intervention with postoperative radiotherapy and radiotherapy alone (palliative low-dose external beam radiotherapy) of spine metastases. Transition probabilities for the model, including the risks of mortality and functional deterioration, were obtained from secondary and our institutional data. Willingness to pay thresholds were prespecified at $100,000 and $150,000. The analyses were censored after 5-year simulation from a health system perspective and discounted outcomes at 3% per year. Sensitivity analyses were conducted to test the robustness of the study design. RESULTS The incremental cost-effectiveness ratios were $140,907 per QALY for patients with a 3-month survival probability >50%, $3,178,510 per QALY for patients with a 3-month survival probability <50%, and $168,385 per QALY for patients with independent ambulatory and 3-month survival probability >50%. CONCLUSIONS This study emphasizes the need to choose patients carefully and estimate preoperative survival for those with spinal metastases. In addition to reaffirming previous research regarding the influence of ambulatory status on cost-effectiveness, our study goes a step further by highlighting that operative intervention with postoperative radiotherapy could be more cost-effective than radiotherapy alone for patients with a better survival outlook. Accurate survival prediction tools and larger future studies could offer more detailed insights for clinical decisions.
Collapse
Affiliation(s)
- Hsiang‐Chieh Hsieh
- Institute of Biomedical Engineering, National Taiwan UniversityTaipeiTaiwan
- Department of Orthopaedic SurgeryNational Taiwan University HospitalTaipeiTaiwan
- Department of Orthopaedic SurgeryNational Taiwan University HospitalHsinchuTaiwan
| | - Hung‐Kuan Yen
- Department of Orthopaedic SurgeryNational Taiwan University HospitalTaipeiTaiwan
- Department of Orthopaedic SurgeryNational Taiwan University HospitalHsinchuTaiwan
- Department of Medical EducationNational Taiwan University HospitalHsinchuTaiwan
| | - Ting‐En Tseng
- Department of Orthopaedic SurgeryNational Taiwan University HospitalTaipeiTaiwan
| | - Yu‐Ting Pan
- Department of Medical EducationNational Taiwan University HospitalTaipeiTaiwan
| | - Min‐Tsun Liao
- Division of Cardiology, Department of Internal MedicineNational Taiwan University HospitalHsinchuTaiwan
| | - Shau‐Huai Fu
- Department of Orthopaedic SurgeryNational Taiwan University HospitalDouliuTaiwan
| | - Mao‐Hsu Yen
- Department of Computer Science and EngineeringNational Taiwan Ocean UniversityKeelungTaiwan
| | - Fu‐Shan Jaw
- Institute of Biomedical Engineering, National Taiwan UniversityTaipeiTaiwan
| | - Wei‐Hsin Lin
- Department of Orthopaedic SurgeryNational Taiwan University HospitalTaipeiTaiwan
| | - Ming‐Hsiao Hu
- Department of Orthopaedic SurgeryNational Taiwan University HospitalTaipeiTaiwan
- Department of Orthopaedics, College of medicine, National Taiwan UniversityTaipeiTaiwan
| | - Shu‐Hua Yang
- Department of Orthopaedic SurgeryNational Taiwan University HospitalTaipeiTaiwan
- Department of Orthopaedics, College of medicine, National Taiwan UniversityTaipeiTaiwan
| | - Olivier Q. Groot
- Department of Orthopaedic SurgeryMassachusetts General Hospital, Harvard Medical SchoolBostonMassachusettsUSA
- Department of OrthopaedicsUniversity Medical Center UtrechtUtrechtNetherlands
| | - Andrew J. Schoenfeld
- Department of Orthopaedic SurgeryBrigham and Women's Hospital, Harvard Medical SchoolBostonMassachusettsUSA
| |
Collapse
|
3
|
Samaranayake CB, Keir G, Slader SAA, Tseng T, Tran K, Anderson J, McCann A, McCabe C, Upham JW. Use of direct oral anticoagulants for acute pulmonary embolisms in obesity: a propensity-matched, multicentre case-control study. ERJ Open Res 2021; 7:00379-2021. [PMID: 34476251 PMCID: PMC8405875 DOI: 10.1183/23120541.00379-2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 06/27/2021] [Indexed: 11/05/2022] Open
Abstract
Direct oral anticoagulants (DOACs) are widely used as first-line treatment for pulmonary embolism (PE) in patients without contraindications [1]; however, limited data exists on the efficacy and safety in obesity. The most recent International Society of Thrombosis and Haemostasis guidelines recommend avoiding DOACs in individuals with body mass index (BMI) >40 kg·m−2 or body weight >120 kg, due to lack of robust clinical efficacy data. Obtaining serum drug levels for therapeutic monitoring in this population has been suggested; however, testing of DOAC levels is neither widely available nor well validated in real-world clinical settings [2]. Given the ongoing uncertainty regarding the clinical outcomes with DOACs in treating acute PE in obese patients, this study aimed to evaluate the efficacy and safety of DOACs compared to warfarin in this population. Assessment of efficacy and safety of DOACs in treatment of pulmonary embolisms in obese patients provides reassurance that treatment with DOACs carries similar rates of recurrent VTE and bleeding complications to warfarinhttps://bit.ly/2VdrSXX
Collapse
Affiliation(s)
| | - Gregory Keir
- Faculty of Medicine, University of Queensland, Brisbane, Australia.,Princess Alexandra Hospital, Brisbane, Australia
| | | | - T Tseng
- Princess Alexandra Hospital, Brisbane, Australia
| | - Khoa Tran
- Faculty of Medicine, University of Queensland, Brisbane, Australia.,Logan Hospital, Brisbane, Australia
| | - James Anderson
- Sunshine Coast University Hospital, Birtinya, Australia.,School of Medicine, Griffith University, Southport, Australia
| | | | - Colm McCabe
- Royal Brompton and Harefield National Health Service Trust, London, UK.,National Heart and Lung Institute, Imperial College, London, UK
| | - John W Upham
- Faculty of Medicine, University of Queensland, Brisbane, Australia.,Princess Alexandra Hospital, Brisbane, Australia
| |
Collapse
|
4
|
Tseng T, Green S, Sheu R, Lo Y. SU-E-T-438: Frameless Cranial Stereotactic Radiosurgery Immobilization Effectiveness Evaluation. Med Phys 2015. [DOI: 10.1118/1.4924799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
5
|
Sheu R, Tseng T, Powers A, Lo Y. SU-E-T-71: Commissioning and Acceptance Testing of a Commercial Monte Carlo Electron Dose Calculation Model (eMC) for TrueBeam. Med Phys 2014. [DOI: 10.1118/1.4888401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
6
|
Tseng T, Sheu R, Todorov B, Green S, Blacksburg S, Lo Y. TH-A-9A-05: Initial Setup Accuracy Comparison Between Frame-Based and Frameless Stereotactic Radiosurgery. Med Phys 2014. [DOI: 10.1118/1.4889575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
7
|
Tseng T, Sheu R, Lo Y. SU-E-T-184: Feasibility of Superabsorbent Polymers as a Buildup Material. Med Phys 2014. [DOI: 10.1118/1.4888514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
8
|
Kim S, Tseng T. SU-E-T-300: Spatial Variations of Multiple Off-Axial Targets for a Single Isocenter SRS Treatment Plan in ExacTrac 6D Robotic Couch System. Med Phys 2014. [DOI: 10.1118/1.4888632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
9
|
Tseng T, Palaniswaamy G, Deb N, Mutyala S, Rangaraj D. SU-E-T-233: Application of Failure Modes and Effects Analysis to COMS Eye Plaque Brachytherapy. Med Phys 2013. [DOI: 10.1118/1.4814668] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
10
|
Boddu S, Neba N, Palaniswaamy G, Massingill B, Tseng T, Morrow A, Deb N, Mutyala S, Rangaraj D. SU-E-T-229: Adopting Toyota Production System Principles & Tools to Improve Radiation Therapy Processes. Med Phys 2013. [DOI: 10.1118/1.4814664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
11
|
Tseng T, Chang Z, Yin F, Wang Z. SU-E-J-32: Evaluation of the Dosimetric Accuracy of Stereotactic Radiosurgery with Cone-Beam Computed Tomography Localization. Med Phys 2012; 39:3659. [DOI: 10.1118/1.4734865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
12
|
Jin HD, Garrison A, Tseng T, Paul BK, Chang CH. High-rate synthesis of phosphine-stabilized undecagold nanoclusters using a multilayered micromixer. Nanotechnology 2010; 21:445604. [PMID: 20935355 DOI: 10.1088/0957-4484/21/44/445604] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Growth in the potential applications of nanomaterials has led to a focus on the development of new manufacturing approaches for these materials. In particular, an increased demand due to the unique properties of nanomaterials requires a substantial yield of high-performance materials and a simultaneous reduction in the environmental impact of these processes. In this paper, a high-rate production of phosphine-stabilized undecagold nanoclusters was achieved using a layer-up strategy which involves the use of microlamination architectures; the patterning and bonding of thin layers of material (laminae) to create a multilayered micromixer in the range of 25-250 µm thick was used to step up the production of phosphine-stabilized undecagold nanoclusters. The continuous production of highly monodispersed phosphine-stabilized undecagold nanoclusters at a rate of about 11.8 (mg s(-1)) was achieved using a microreactor with a size of 1.687 cm(3). This result is about 500 times over conventional batch syntheses based on the production rate per reactor volume.
Collapse
Affiliation(s)
- Hyung Dae Jin
- School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, OR 97331, USA
| | | | | | | | | |
Collapse
|
13
|
Baccarelli A, Calista D, Minghetti P, Marinelli B, Albetti B, Tseng T, Hedayati M, Grossman L, Landi G, Struewing JP, Landi MT. XPD gene polymorphism and host characteristics in the association with cutaneous malignant melanoma risk. Br J Cancer 2004; 90:497-502. [PMID: 14735199 PMCID: PMC2409542 DOI: 10.1038/sj.bjc.6601385] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
We recently reported an association between low DNA repair capacity, measured through the host-cell reactivation assay, and melanoma risk in subjects with dysplastic naevi or low tanning ability. We investigated the genetic basis for these findings by analysing the Asp312Asn and Lys751Gln polymorphisms of the XPD (ERCC2) DNA repair gene in the same subjects. Similar to our previous report, no significant association between XPD polymorphisms and melanoma risk was found in 176 melanoma cases and 177 controls (odds ratio (OR)=1.5, 95% confidence interval (CI)=0.9–2.5 for 312Asn; OR=1.3, 95% CI=0.8–2.1 for 751Gln, adjusted for age, gender, dysplastic naevi and pigmentation characteristics). However, XPD variants were associated with increased risk in older (>50 years) subjects (OR=3.4, 95% CI=1.6–7.3 for 312Asn; OR=2.3, 95% CI=1.1–4.9 for 751Gln). The 751Gln allele was associated with elevated melanoma risk among subjects without dysplastic naevi (OR=2.6, 95% CI=1.1–6.4). Subjects with low tanning ability and XPD variants exhibited a nonsignificant increase of melanoma risk (OR=2.3, 95% CI=0.7–7.0 for 312Asn; OR=3.0, 95% CI=1.0–8.8 for 751Gln). DNA repair capacity was slightly decreased in subjects carrying 751Gln alleles. XPD variants may modify melanoma risk in subjects with specific host characteristics, such as older age, lack of dysplastic naevi or low tanning ability.
Collapse
Affiliation(s)
- A Baccarelli
- Genetic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, NCI, NIH, DHHS, 6120 Executive Blvd., Bethesda, MD 20892-7236, USA
| | - D Calista
- Dermatology Unit, Bufalini Hospital, Viale Ghirotti 286, 47023 Cesena, Italy
| | - P Minghetti
- Dermatology Unit, Bufalini Hospital, Viale Ghirotti 286, 47023 Cesena, Italy
| | - B Marinelli
- EPOCA, Epidemiology Research Centre, University of Milan, Via S. Barnaba, 8, Milan 20122, Italy
| | - B Albetti
- EPOCA, Epidemiology Research Centre, University of Milan, Via S. Barnaba, 8, Milan 20122, Italy
| | - T Tseng
- Laboratory of Population Genetics, Centre for Cancer Research, NCI, NIH, DHHS, 41 Library Drive, Bethesda, MD 20892-5060, USA
| | - M Hedayati
- Department of Biochemistry, Bloomberg School of Public Health, The Johns Hopkins University, 615 North Wolfe Street, Baltimore, MD 21205, USA
| | - L Grossman
- Department of Biochemistry, Bloomberg School of Public Health, The Johns Hopkins University, 615 North Wolfe Street, Baltimore, MD 21205, USA
| | - G Landi
- Dermatology Unit, Bufalini Hospital, Viale Ghirotti 286, 47023 Cesena, Italy
| | - J P Struewing
- Laboratory of Population Genetics, Centre for Cancer Research, NCI, NIH, DHHS, 41 Library Drive, Bethesda, MD 20892-5060, USA
| | - M T Landi
- Genetic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, NCI, NIH, DHHS, 6120 Executive Blvd., Bethesda, MD 20892-7236, USA
- Genetic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, NCI, NIH, DHHS, 6120 Executive Blvd., Bethesda, MD 20892-7236, USA. E-mail:
| |
Collapse
|
14
|
Wilcox RE, Tseng T, Brusniak MY, Ginsburg B, Pearlman RS, Teeter M, DuRand C, Starr S, Neve KA. CoMFA-based prediction of agonist affinities at recombinant D1 vs D2 dopamine receptors. J Med Chem 1998; 41:4385-99. [PMID: 9784114 DOI: 10.1021/jm9800292] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have previously shown that using agonist affinity at recombinant receptors selectively expressed in clonal cells as the dependent variable in three-dimensional quantitative structure-activity relationship studies (3D-QSAR) presents a unique opportunity for accuracy and precision in measurement. Thus, a comparison of affinity's structural determinants for a set of compounds at two different recombinant dopamine receptors represents an attainable goal for 3D-QSAR. A molecular database of bound conformations of 16 structurally diverse agonists was established by alignment with a high-affinity template compound for the D1 receptor, 3-allyl-6-bromo-7,8-dihydroxy-1-phenyl-2,3,4, 5-tetrahydro-1H-benzazepin. A second molecular database of the bound conformations of the same compounds was established against a second template for the D2 receptor, bromocriptine. These aligned structures suggested three-point pharmacophore maps (one cationic nitrogen and two electronegative centers) for the two dopamine receptors, which differed primarily in the height of the nitrogen above the plane of the catechol ring and in the nature of the hydrogen-bonding region. The ln(1/KL) values for the low-affinity agonist binding conformation at recombinant D1 and D2 dopamine receptors stably expressed in C6 glioma cells were used as the target property for the CoMFA (comparative molecular field analysis) of the 16 aligned structures. The resulting CoMFA models yielded cross-validated R2 (q2) values (standard error of prediction) of 0. 879 (1.471, with five principal components) and 0.834 (1.652, with five principal components) for D1 and D2 affinity, respectively. The simple R2 values (standard error of the estimate) were 0.994 (0.323) and 0.999 (0.116), respectively, for D1 and D2 receptor. F values were 341 and 2465 for D1 and D2 models, respectively, with 5 and 10 df. The predictive utility of the CoMFA model was evaluated at both receptors using the dopamine agonists, apomorphine and 7-OH-DPAT. Predictions of KL were accurate at both receptors. Flexible 3D searches of several chemical databases (NCI, MDDR, CMC, ACD, and Maybridge) were done using basic pharmacophore models at each receptor to determine the similarity of hit lists between the two models. The D1 and D2 models yielded different lists of lead compounds. Several of the lead compounds closely resembled high-affinity training set compounds. Finally, homology modeling of agonist binding to the D2 receptor revealed some consistencies and inconsistencies with the CoMFA-derived D2 model and provided a possible rationale for features of the D2 CoMFA contour map. Together these results suggest that CoMFA-homology based models may provide useful insights concerning differential agonist-receptor interactions at related receptors. The results also suggest that comparisons of CoMFA models for two structurally related receptors may be a fruitful approach for differential QSAR.
Collapse
MESH Headings
- Animals
- Binding Sites
- Databases, Factual
- Dopamine Agonists/chemistry
- Dopamine Agonists/metabolism
- Dopamine Agonists/pharmacology
- Humans
- Ligands
- Macaca mulatta
- Models, Molecular
- Molecular Conformation
- Protein Structure, Secondary
- Rats
- Receptors, Dopamine D1/agonists
- Receptors, Dopamine D1/biosynthesis
- Receptors, Dopamine D1/chemistry
- Receptors, Dopamine D1/metabolism
- Receptors, Dopamine D2/agonists
- Receptors, Dopamine D2/biosynthesis
- Receptors, Dopamine D2/chemistry
- Receptors, Dopamine D2/metabolism
- Recombinant Proteins/agonists
- Recombinant Proteins/chemistry
- Recombinant Proteins/metabolism
- Structure-Activity Relationship
- Tumor Cells, Cultured
Collapse
Affiliation(s)
- R E Wilcox
- Molecular Pharmacology Laboratory, College of Pharmacy, University of Texas at Austin, Austin, Texas 78712-1074, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Deora R, Tseng T, Misra TK. Alternative transcription factor sigmaSB of Staphylococcus aureus: characterization and role in transcription of the global regulatory locus sar. J Bacteriol 1997; 179:6355-9. [PMID: 9335283 PMCID: PMC179550 DOI: 10.1128/jb.179.20.6355-6359.1997] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
A homolog of the multiple-stress-responsive transcription factor sigmaB of Bacillus subtilis was predicted from the DNA sequence analysis of a region of the Staphylococcus aureus chromosome. A hybrid between the coding sequence of the first 11 amino acids of the gene 10 leader peptide of phage T7 (T7.Tag) and the putative sigB gene of S. aureus was constructed and cloned into Escherichia coli BL21(DE3)pLysS for overexpression from a T7 promoter. A homogeneous preparation of the overproduced protein was obtained by affinity chromatography with a T7.Tag monoclonal antibody coupled to agarose. The amino-terminal amino acid sequence of the first 22 residues of the purified protein matched that deduced from the nucleotide sequence. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of the purified protein, designated sigmaSB, indicated that it migrated as an approximately 39-kDa polypeptide. Promoter-specific transcription from the B. subtilis sigmaB-dependent PB promoter of the sigB operon was stimulated by sigmaSB in a concentration-dependent fashion when reconstituted with the S. aureus core RNA polymerase (RNAP). Specific transcript from the predicted sigmaB-dependent PB promoter of the sigB operon of S. aureus was obtained by the reconstituted RNAP in a runoff transcription reaction. The sar operon of S. aureus contains three promoter elements (P1, P2, and P3) and is known to partly control the synthesis of a number of extracellular toxins and several cell wall proteins. Our in vitro studies revealed that transcription from the P1 promoter is dependent on the primary sigma factor sigmaSA, while that of the P3 promoter is dependent on sigmaSB. As determined by primer extension studies, the 5' end of the sigmaSB-initiated mRNA synthesized in vitro from the sar P3 promoter is in agreement with the 5' end of the cellular RNA.
Collapse
Affiliation(s)
- R Deora
- Department of Microbiology and Immunology, University of Illinois College of Medicine, Chicago 60612, USA
| | | | | |
Collapse
|
16
|
Tseng T, Chu C, Wang C. Comparison of geniposide and its acetylated derivative for the inhibition of aflatoxin b1-induced DNA-repair synthesis in rat primary hepatocyte. Oncol Rep 1994; 1:165-8. [PMID: 21607329 DOI: 10.3892/or.1.1.165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Our previous studies showed that geniposide (GP) inhibits aflatoxin B1 (AFB1)-induced hepatoxicity in rats, and that DNA repair synthesis in vitro and penta-acetyl geniposide ((Ac)5-GP) inhibits AFB1-induced genotoxicity in C3H10T1/2 cells. One possible mechanism for GP is the enhancement of the enzyme activity of glutathione S-transferase (GST) and GSH-peroxidase (GSH-Px) in AFB1-treated hepatocyte culture. But the mechanism is unknown for (Ac)5-GP. The present study demonstrated that (Ac)5-GP was more potent in inhibiting AFB1-induced unscheduled DNA synthesis in rat primary hepatocyte. The action of GP and (Ac)S-GP may be related to their ability to induce the activity of phase II enzymes.
Collapse
Affiliation(s)
- T Tseng
- CHUNG SHAN MED & DENT COLL,INST BIOCHEM,TAICHUNG 402,TAIWAN
| | | | | |
Collapse
|
17
|
Bhaskar G, Muralidhara R, Tseng T. Unilateral pulmonary edema in Swyer-James syndrome. J Kans Med Soc 1980; 81:467-8. [PMID: 7229497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|