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Rittenhouse KJ, Vwalika B, Sebastiao Y, Pokaprakarn T, Sindano N, Shah H, Stringer EM, Kasaro MP, Cole SR, Stringer JSA, Price JT. Accuracy of portable ultrasound for obstetric biometry. Ultrasound Obstet Gynecol 2023. [PMID: 38011589 DOI: 10.1002/uog.27541] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 11/07/2023] [Accepted: 11/15/2023] [Indexed: 11/29/2023]
Abstract
OBJECTIVE We assessed the accuracy of two portable ultrasound machines (PUM) in obtaining fetal biometry and estimating gestational age. METHODS We analyzed data from the Fetal Age Machine Learning Initiative, an observational study of pregnant women in the United States and Zambia. Each participant underwent assessment by an experienced sonographer using both a high-specification ultrasound machine (HSUM) and a PUM (either Butterfly iQ or Clarius C3) to measure fetal biometry and calculate estimated gestational age (EGA) at each visit. Through comparison of paired PUM-HSUM scans, we estimated agreement between individual biometry measurements and aggregate gestational age estimates by reporting mean difference, along with intraclass correlation coefficient (ICC) and Bland-Altman plots, adjusting for trend. RESULTS 881 participants contributed 1386 paired PUM-HSUM ultrasound studies between April and December 2021. PUM studies included 991 Butterfly and 395 Clarius. Gestational age at scan ranged from 7 to 38 weeks. Compared to HSUM, the Butterfly PUM had a mean difference of -0.20 days (95%CI±0.40) in the 1st trimester and -0.68 days (95%CI±0.68) in the 2nd/3rd trimesters. Also compared to HSUM, the Clarius PUM had a mean difference of 0.47 days (95%CI±0.64) in the 1st trimester and -1.67 days (95%CI±0.43) in the 2nd/3rd trimesters. ICCs were 0.989 or greater throughout. Increasing gestational age was associated with increasing error and absolute error. Both PUM devices demonstrated a modest trend toward underestimation of EGA at advancing gestational ages in 2nd/3rd trimester scans, compared to HSUM. CONCLUSION Both the Butterfly iQ and Clarius C3 PUM devices were highly accurate in performing fetal biometry in a diverse population from the US and Zambia. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- K J Rittenhouse
- Department of Obstetrics and Gynecology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
| | - B Vwalika
- Department of Obstetrics and Gynecology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
- Department of Obstetrics and Gynaecology, University of Zambia School of Medicine, Lusaka, Zambia
| | - Y Sebastiao
- Department of Obstetrics and Gynecology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
| | - T Pokaprakarn
- Department of Biostatistics, University of North Carolina Gillings School of Global Public Health, Chapel Hill, NC, USA
| | - N Sindano
- UNC Global Projects - Zambia, LLC, Lusaka, Zambia
| | - H Shah
- Department of Psychiatry, University of North Carolina School of Medicine, Chapel Hill, NC, USA
| | - E M Stringer
- Department of Obstetrics and Gynecology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
| | - M P Kasaro
- Department of Obstetrics and Gynaecology, University of Zambia School of Medicine, Lusaka, Zambia
- UNC Global Projects - Zambia, LLC, Lusaka, Zambia
| | - S R Cole
- Department of Epidemiology, University of North Carolina Gillings School of Global Public Health, Chapel Hill, NC, USA
| | - J S A Stringer
- Department of Obstetrics and Gynecology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
- UNC Global Projects - Zambia, LLC, Lusaka, Zambia
| | - J T Price
- Department of Obstetrics and Gynecology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
- UNC Global Projects - Zambia, LLC, Lusaka, Zambia
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Price JT, Asgary R. Implementation and feasibility of an adapted two-stage visual inspection with acetic acid/cryotherapy-based cervical cancer screening programme for HIV-infected women in Addis Ababa, Ethiopia. Eur J Cancer Care (Engl) 2017; 25:526-7. [PMID: 27121898 DOI: 10.1111/ecc.12480] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/27/2016] [Indexed: 12/01/2022]
Affiliation(s)
- J T Price
- Division of Global Women's Health, Department of Obstetrics and Gynecology, University of North Carolina-Chapel Hill, Chapel Hill, NC, USA
| | - R Asgary
- Department of Medicine, New York University School of Medicine, New York, NY, USA.
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3
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Li MSM, Chu K, Price JT, Jones ND, Ding Z. Analyzing Electrochemiluminescence Mechanisms of Thiophene-Triazole-Thiophene Luminophores with In Situ Spectroscopy. ChemElectroChem 2016. [DOI: 10.1002/celc.201600237] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Michelle S. M. Li
- Department of Chemistry; University of Western Ontario; 1151 Richmond Street London Ontario N6A 5B7 Canada
| | - Kenneth Chu
- Department of Chemistry; University of Western Ontario; 1151 Richmond Street London Ontario N6A 5B7 Canada
| | - Jacquelyn T. Price
- Department of Chemistry; University of Western Ontario; 1151 Richmond Street London Ontario N6A 5B7 Canada
| | - Nathan D. Jones
- Department of Chemistry; University of Western Ontario; 1151 Richmond Street London Ontario N6A 5B7 Canada
| | - Zhifeng Ding
- Department of Chemistry; University of Western Ontario; 1151 Richmond Street London Ontario N6A 5B7 Canada
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4
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Barbon SM, Price JT, Yogarajah U, Gilroy JB. Synthesis and characterization of conjugated/cross-conjugated benzene-bridged boron difluoride formazanate dimers. RSC Adv 2015. [DOI: 10.1039/c5ra09505k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
A study designed to probe the effect of electronic conjugation and cross-conjugation on the optical and electrochemical properties of benzene-bridged boron difluoride formazanate dimers is presented.
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Affiliation(s)
- Stephanie M. Barbon
- Department of Chemistry
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - Jacquelyn T. Price
- Department of Chemistry
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - Umesh Yogarajah
- Department of Chemistry
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - Joe B. Gilroy
- Department of Chemistry
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
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Gobbo P, Romagnoli T, Barbon SM, Price JT, Keir J, Gilroy JB, Workentin MS. Expanding the scope of strained-alkyne chemistry: a protection–deprotection strategy via the formation of a dicobalt–hexacarbonyl complex. Chem Commun (Camb) 2015; 51:6647-50. [DOI: 10.1039/c5cc01522g] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A protection–deprotection strategy for strained alkynes is reported. A strained alkyne can be protected with dicobalt–octacarbonyl and we demonstrate for the first time that the a strained alkyne can be re-formed and isolated under mild conditions for further bioorthogonal reactivity.
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Affiliation(s)
- Pierangelo Gobbo
- Department of Chemistry and the Centre for Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - Tommaso Romagnoli
- Department of Chemistry and the Centre for Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - Stephanie M. Barbon
- Department of Chemistry and the Centre for Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - Jacquelyn T. Price
- Department of Chemistry and the Centre for Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - Jennifer Keir
- Department of Chemistry and the Centre for Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - Joe B. Gilroy
- Department of Chemistry and the Centre for Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
| | - Mark S. Workentin
- Department of Chemistry and the Centre for Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada
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Barbon SM, Price JT, Reinkeluers PA, Gilroy JB. Substituent-Dependent Optical and Electrochemical Properties of Triarylformazanate Boron Difluoride Complexes. Inorg Chem 2014; 53:10585-93. [DOI: 10.1021/ic5016912] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Stephanie M. Barbon
- Department
of Chemistry and the Centre for Advanced Materials and Biomaterials
Research (CAMBR), The University of Western Ontario, 1151 Richmond
St. N., London, Ontario Canada, N6A 5B7
| | - Jacquelyn T. Price
- Department
of Chemistry and the Centre for Advanced Materials and Biomaterials
Research (CAMBR), The University of Western Ontario, 1151 Richmond
St. N., London, Ontario Canada, N6A 5B7
| | - Pauline A. Reinkeluers
- Department
of Chemistry and the Centre for Advanced Materials and Biomaterials
Research (CAMBR), The University of Western Ontario, 1151 Richmond
St. N., London, Ontario Canada, N6A 5B7
| | - Joe B. Gilroy
- Department
of Chemistry and the Centre for Advanced Materials and Biomaterials
Research (CAMBR), The University of Western Ontario, 1151 Richmond
St. N., London, Ontario Canada, N6A 5B7
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7
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Barbon SM, Reinkeluers PA, Price JT, Staroverov VN, Gilroy JB. Structurally Tunable 3-Cyanoformazanate Boron Difluoride Dyes. Chemistry 2014; 20:11340-4. [DOI: 10.1002/chem.201404297] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Indexed: 01/01/2023]
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Abstract
6-Oxoverdazyl radical polymers were synthesized and their tunable redox properties studied in solution and the solid-state.
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Affiliation(s)
- Jacquelyn T. Price
- Department of Chemistry
- The University of Western Ontario
- London N6A 5B7, Canada
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
| | - Joseph A. Paquette
- Department of Chemistry
- The University of Western Ontario
- London N6A 5B7, Canada
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
| | - Christopher S. Harrison
- Department of Chemistry
- The University of Western Ontario
- London N6A 5B7, Canada
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
| | - Reg Bauld
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London N6A 5B7, Canada
- Department of Physics and Astronomy
- The University of Western Ontario
| | - Giovanni Fanchini
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London N6A 5B7, Canada
- Department of Physics and Astronomy
- The University of Western Ontario
| | - Joe B. Gilroy
- Department of Chemistry
- The University of Western Ontario
- London N6A 5B7, Canada
- The Centre for Advanced Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
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9
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Abstract
A novel diamine ligand containing a simple thiophene ring in the backbone has been synthesized. Substitution at the nitrogen atoms with either 2,4,6-trimethylphenyl (Mes) or 2,6-diisopropylphenyl (Dipp) was varied via a condensation reaction between the corresponding aniline and 3,4-diformylthiophene, giving two different ligand derivatives. In onwards chemistry that targeted the cyclic diaminochlorophosphines, the substitution at phosphorus was dependent on the ligand used. For example, when a stoichiometric reaction between PCl3 and thiophene-3,4 diyldimethaneamine (R = Mes) was carried out, the synthesis of a bis-substituted diphosphino- product was isolated. If the R = Dipp ligand derivative was employed, both a 2:1 and 1:1 stoichiometric reaction between PCl3 and the diamine was observed. Nevertheless, the cyclic diaminochlorophosphine (i.e., 1:1 stoichiometry) for R = Dipp was isolated in high yields and the synthesis of the corresponding phosphenium cation was achieved and structurally characterized.
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Affiliation(s)
- Jacquelyn T. Price
- Department of Chemistry and Center for Advanced Materials and Biomaterials Research (CAMBR), The University of Western University, London, ON N6A 3K7, Canada
| | - Nathan D. Jones
- Department of Chemistry and Center for Advanced Materials and Biomaterials Research (CAMBR), The University of Western University, London, ON N6A 3K7, Canada
| | - Paul J. Ragogna
- Department of Chemistry and Center for Advanced Materials and Biomaterials Research (CAMBR), The University of Western University, London, ON N6A 3K7, Canada
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Price JT, Ragogna PJ. A Versatile Dithienylethene-Functionalized Ph-Diazabutadiene (DAB) Ligand: From Photoswitchable Main-Group Molecules to Photochromic Polymers. Chemistry 2013; 19:8473-7. [PMID: 23670938 DOI: 10.1002/chem.201301086] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Jacquelyn T Price
- Department of Chemistry, University of Western Ontario, The Centre for Materials and Biomaterials Research (CAMBR), 1151 Richmond St, London, Ontario, N6 A 3 K7, Canada
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11
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Swanick KN, Price JT, Jones ND, Ding Z. Synthesis, Structure, Electrochemistry, and Electrochemiluminescence of Thienyltriazoles. J Org Chem 2012; 77:5646-55. [DOI: 10.1021/jo300802h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Kalen N. Swanick
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario,
Canada N6A 5B7
| | - Jacquelyn T. Price
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario,
Canada N6A 5B7
| | - Nathan D. Jones
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario,
Canada N6A 5B7
| | - Zhifeng Ding
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario,
Canada N6A 5B7
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12
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Price JT, Jones ND, Ragogna PJ. An N-Heterocyclic Carbene Containing a Bithiophene Backbone: Synthesis and Coordination Chemistry. Inorg Chem 2012; 51:6776-83. [DOI: 10.1021/ic300494g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jacquelyn T. Price
- Department of Chemistry, Western University, 1151 Richmond Street,
London, Ontario N6A 5B7, Canada
| | - Nathan D. Jones
- Department of Chemistry, Western University, 1151 Richmond Street,
London, Ontario N6A 5B7, Canada
| | - Paul J. Ragogna
- Department of Chemistry, Western University, 1151 Richmond Street,
London, Ontario N6A 5B7, Canada
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13
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Affiliation(s)
- Jacquelyn T. Price
- Department
of Chemistry, The University of London Ontario, 1151 Richmond St., London, Ontario
N6A 5B7, Canada
| | - Melanie Lui
- Department
of Chemistry, The University of London Ontario, 1151 Richmond St., London, Ontario
N6A 5B7, Canada
| | - Nathan D. Jones
- Department
of Chemistry, The University of London Ontario, 1151 Richmond St., London, Ontario
N6A 5B7, Canada
| | - Paul J. Ragogna
- Department
of Chemistry, The University of London Ontario, 1151 Richmond St., London, Ontario
N6A 5B7, Canada
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14
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Swanick KN, Dodd DW, Price JT, Brazeau AL, Jones ND, Hudson RHE, Ding Z. Electrogenerated chemiluminescence of triazole-modified deoxycytidine analogues in N,N-dimethylformamide. Phys Chem Chem Phys 2011; 13:17405-12. [DOI: 10.1039/c1cp22116g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Dodd DW, Swanick KN, Price JT, Brazeau AL, Ferguson MJ, Jones ND, Hudson RHE. Blue fluorescent deoxycytidine analogues: convergent synthesis, solid-state and electronic structure, and solvatochromism. Org Biomol Chem 2010; 8:663-6. [DOI: 10.1039/b919921g] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Caputo CA, Brazeau AL, Hynes Z, Price JT, Tuononen HM, Jones ND. A Cation-Captured Palladium(0) Anion: Synthesis, Structure, and Bonding of [PdBr(PPh3)2]− Ligated by an N-Heterocyclic Phosphenium Cation. Organometallics 2009. [DOI: 10.1021/om9006278] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christine A. Caputo
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
| | - Allison L. Brazeau
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
| | - Zachery Hynes
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
| | - Jacquelyn T. Price
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
| | - Heikki M. Tuononen
- Department of Chemistry, University of Jyväskylä, P.O. Box 35, Fl-40014, Jyväskylä, Finland
| | - Nathan D. Jones
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
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Cornacchio ALP, Price JT, Jennings MC, McDonald R, Staroverov VN, Jones ND. Meta-Substituted Thienyl Benzenes: A Comparative Synthetic, Structural and Computational Study. J Org Chem 2008; 74:530-44. [DOI: 10.1021/jo801771d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Jacquelyn T. Price
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Michael C. Jennings
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Robert McDonald
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Viktor N. Staroverov
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Nathan D. Jones
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
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Caputo CA, Price JT, Jennings MC, McDonald R, Jones ND. N-Heterocyclic phosphenium cations: syntheses and cycloaddition reactions. Dalton Trans 2008:3461-9. [DOI: 10.1039/b801684d] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Suter CM, Hogg PJ, Price JT, Chong BH, Ward RL. Identification and characterisation of a platelet GPIb/V/IX-like complex on human breast cancers: implications for the metastatic process. Jpn J Cancer Res 2001; 92:1082-92. [PMID: 11676859 PMCID: PMC5926614 DOI: 10.1111/j.1349-7006.2001.tb01063.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The glycoprotein (GP) Ib /V/IX receptor complex is an important adhesion molecule, originally thought to be unique to the megakaryocytic lineage. Recent evidence now indicates that GPIb /V/IX may be more widely expressed. In this study we report the presence of all subunits of the complex on four breast cancer cell lines, and 51 / 80 primary breast tumours. The surface expression of GPIb /V/IX was confirmed by flow cytometry, and by immunoprecipitation of biotin surface-labelled tumour cells. Western blotting of cell lysates under reducing conditions revealed that tumour cell-GPIb alpha had a relative molecular weight of 95 kDa as compared to 135 kDa on platelets. Despite the discrepant protein size, molecular analyses on the tumour cell-GPIb alpha subunit using RT-PCR and DNA sequencing revealed 100% sequence homology to platelet GPIb alpha. Tumour cell-GPIb /V/IX was capable of binding human von Willebrand factor (vWf), and this binding caused aggregation of tumour cells in suspension. Tumour cells bound to immobilised vWf in the presence of EDTA and demonstrated prominent filapodial extensions indicative of cytoskeletal reorganisation. Furthermore, in a modified Boyden chamber assay, prior exposure to vWf or a GPIb alpha monoclonal antibody, AK2, enhanced cell migration. The presence of a functional GPIb /V/IX-like complex in tumour cells suggests that this complex may participate in the process of haematogenous breast cancer metastasis.
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Affiliation(s)
- C M Suter
- Department of Medical Oncology, St. Vincent fs Hospital, Victoria St, Darlinghurst, NSW 2010, Australia
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Price JT, Tiganis T, Agarwal A, Djakiew D, Thompson EW. Epidermal growth factor promotes MDA-MB-231 breast cancer cell migration through a phosphatidylinositol 3'-kinase and phospholipase C-dependent mechanism. Cancer Res 1999; 59:5475-8. [PMID: 10554021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Epidermal growth factor receptor (EGFR) levels predict a poor outcome in human breast cancer and are most commonly associated with proliferative effects of epidermal growth factor (EGF), with little emphasis placed on motogenic responses to EGF. We found that MDA-MB-231 human breast cancer cells elicited a potent chemotactic response despite their complete lack of a proliferative response to EGF. Antagonists of EGFR ligation, the EGFR kinase, phosphatidylinositol 3'-kinase, and phospholipase C, but not the mitogen-activated protein kinases (extracellular signal-regulated protein kinase 1 and 2), blocked MDA-MB-231 chemotaxis. These findings suggest that EGF may influence human breast cancer progression via migratory pathways, the signaling for which appears to be dissociated, at least in part, from the proliferative pathways.
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Affiliation(s)
- J T Price
- Victorian Breast Cancer Research Consortium Invasion and Metastasis Unit, St. Vincent's Institute of Medical Research, Fitzroy, Australia
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Affiliation(s)
- J T Price
- Invasion and Metastasis Unit, Victorian Breast Cancer Research Consortium, St. Vincent's Institute of Medical Research, Melbourne, Australia
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Abstract
The progression of a tumor cell from one of benign delimited proliferation to invasive and metastatic growth is the major cause of poor clinical outcome of cancer patients. Recent research has revealed that this complex process requires many components for successful dissemination and growth of the tumor cell at secondary sites. These include angiogenesis, enhanced extracellular matrix degradation via tumor and host-secreted proteases, tumor cell migration, and modulation of tumor cell adhesion. Each individual component is multifaceted and is discussed within this review with respect to historical and recent findings. The identification of components and their interrelationship have yielded new therapeutic targets leading to the development of agents that may prove effective in the treatment of cancer and its metastatic progression.
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Affiliation(s)
- J T Price
- Molecular Signaling Section, National Cancer Institute, Bethesda, Maryland, USA
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Price JT, Wilson HM, Haites NE. Epidermal growth factor (EGF) increases the in vitro invasion, motility and adhesion interactions of the primary renal carcinoma cell line, A704. Eur J Cancer 1996; 32A:1977-82. [PMID: 8943684 DOI: 10.1016/0959-8049(96)00207-9] [Citation(s) in RCA: 81] [Impact Index Per Article: 2.9] [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: 02/03/2023]
Abstract
Metastasis is a multistep process that involves alterations in a tumour cell's invasion, motility and adhesive capabilities. This study examined the effect of EGF on the in vitro invasion, motility and adhesion of the primary renal adenocarcinoma cell line, A704. Stimulation of the tumour cells by EGF (40 ng/ml) for a period of 24 h increased the in vitro invasion (P = 0.040) and motility (P = 0.039). Cell adhesion was examined on fibronectin, laminin, collagen IV and a 1:1:1 mix of the three extracellular matrix components. After EGF (40 ng/ml) stimulation, adhesion was significantly decreased on fibronectin (P = 0.022) and collagen type IV (P = 0.026), but increased on the 1:1:1 mix of extracellular matrix components (P = 0.022). The 92 kDa matrix metalloproteinase (MMP-9) present in the cell-conditioned medium was also increased after a 24 h stimulation with EGF (40 ng/ml) when measured. Hence, EGF can modulate the in vitro invasion, motility, adhesiveness and matrix metalloproteinase production in the A704 cell line, and subsequently may have a role in the metastatic potential of some renal carcinomas.
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Affiliation(s)
- J T Price
- Department of Medicine and Therapeutics, University of Aberdeen, U.K
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26
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Abstract
A human isolate of Cryptococcus neoformans strain CIA, which was originally obtained in 1963, produced fatal disease in mice. Postmortem examinations showed extensive central nervous system disease. After using this yeast for research for 7 years, we found that it began to produce large tumors after intraperitoneal inoculation in mice. The present study showed that the tumors consisted of large agglomerates of yeast cells, capillaries, and reticular stroma. In concomitant experiments, the same C. neoformans strain, introduced into the lungs of mice in an aerosol, produced asymptomatic infections. A definition for the term "cryptococcoma" is proposed.
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