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Mei N, Liang J, McRae DM, Leonenko Z. Localized surface plasmon resonance and atomic force microscopy study of model lipid membranes and their interactions with amyloid and melatonin. Nanotechnology 2024. [PMID: 38636478 DOI: 10.1088/1361-6528/ad403b] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/20/2024]
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disorder characterized by the accumulation of amyloid plaques in the brain. The toxicity of amyloid to neuronal cell surfaces arises from interactions between small intermediate aggregates, namely amyloid oligomers, and the cell membrane. The nature of these interactions changes with age and disease progression. In our previous work, we demonstrated that both membrane composition and nanoscale structure play crucial roles in amyloid-membrane interactions. In our previous work, we demonstrated that both membrane composition and nanoscale structure play crucial roles in amyloid toxicity, and that membrane models mimicking healthy neuron were less affected by amyloid than model membranes mimicking AD neuronal membranes. This understanding introduces the possibility of modifying membrane properties with membrane-active molecules, such as melatonin, to protect them from amyloid-induced damage. In the present study, we employed atomic force microscopy (AFM) and localized surface plasmon resonance (LSPR) to investigate the protective effects of melatonin. We utilized synthetic lipid membranes that mimic the neuronal cellular membrane at various stages of AD and explored their interactions with amyloid-β (1-42) in the presence of melatonin. Our findings reveal that the early diseased membrane model is particularly vulnerable to amyloid binding and subsequent damage. However, melatonin exerts its most potent protective effect on this early-stage membrane. These results suggest that melatonin could act at the membrane level to alleviate amyloid toxicity, offering the most protection during the initial stages of AD.
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Affiliation(s)
- Nanqin Mei
- Department of Physics and Astronomy, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, CANADA
| | - Jingwen Liang
- Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, CANADA
| | - Danielle M McRae
- Department of Physics & Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, CANADA
| | - Zoya Leonenko
- Department of Physics and Astronomy, Department of Biology, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, N2L 3G1, CANADA
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2
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Kherbouche I, McRae DM, Jourdain TG, Lagugné-Labarthet F, Lamouri A, Biraud AC, Mangeney C, Félidj N. Correction: Extending nanoscale patterning with multipolar surface plasmon resonances. Nanoscale 2021; 13:13905. [PMID: 34477664 DOI: 10.1039/d1nr90167b] [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] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Correction for 'Extending nanoscale patterning with multipolar surface plasmon resonances' by Issam Kherbouche et al., Nanoscale, 2021, 13, 11051-11057, DOI: .
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Affiliation(s)
- Issam Kherbouche
- Université de Paris, ITODYS, CNRS, UMR 7086, 15 rue J-A de Baïf, F-75013 Paris, France.
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Therien DAB, McRae DM, Mangeney C, Félidj N, Lagugné-Labarthet F. Three-color plasmon-mediated reduction of diazonium salts over metasurfaces. Nanoscale Adv 2021; 3:2501-2507. [PMID: 36134146 PMCID: PMC9417294 DOI: 10.1039/d0na00862a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 02/20/2021] [Indexed: 06/14/2023]
Abstract
Surface plasmon-mediated chemical reactions are of great interest for a variety of applications ranging from micro- and nanoscale device fabrication to chemical reactions of societal interest for hydrogen production or carbon reduction. In this work, a crosshair-like nanostructure is investigated due to its ability to induce local enhancement of the local electromagnetic field at three distinct wavelengths corresponding to three plasmon resonances. The structures are irradiated in the presence of a solution containing diazonium salts at wavelengths that match the resonance positions at 532 nm, 632.8 nm, and 800 nm. The resulting grafting shows polarization and wavelength-dependent growth patterns at the nanoscale. The plasmon-mediated reactions over arrays of the crosshair structures are further investigated using scanning electron microscopy and supported by finite domain time domain modelling revealing wavelength and polarization specific reactions. Such an approach enables nanoscale molecular printing using light source opening multiplexing applications where different analytes can be grafted under distinct opto-geometric conditions.
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Affiliation(s)
- Denis A B Therien
- Department of Chemistry, University of Western Ontario 1151 Richmond Street London ON N6A 5B7 Canada
| | - Danielle M McRae
- Department of Chemistry, University of Western Ontario 1151 Richmond Street London ON N6A 5B7 Canada
| | - Claire Mangeney
- Université de Paris, Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, LCBPT, UMR 8601 CNRS 45 rue des Saints Péres F-75006 Paris France
| | - Nordin Félidj
- Université de Paris, ITODYS, UMR 7086 CNRS 15 rue J.-A. de Baïf F-75013 Paris France
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Cooper TT, Sherman SE, Bell GI, Dayarathna T, McRae DM, Ma J, Lagugné-Labarthet F, Pasternak SH, Lajoie GA, Hess DA. Ultrafiltration and Injection of Islet Regenerative Stimuli Secreted by Pancreatic Mesenchymal Stromal Cells. Stem Cells Dev 2021; 30:247-264. [PMID: 33403929 PMCID: PMC10331161 DOI: 10.1089/scd.2020.0206] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 12/11/2020] [Accepted: 01/04/2021] [Indexed: 12/13/2022] Open
Abstract
The secretome of mesenchymal stromal cells (MSCs) is enriched for biotherapeutic effectors contained within and independent of extracellular vesicles (EVs) that may support tissue regeneration as an injectable agent. We have demonstrated that the intrapancreatic injection of concentrated conditioned media (CM) produced by bone marrow MSC supports islet regeneration and restored glycemic control in hyperglycemic mice, ultimately providing a platform to elucidate components of the MSC secretome. Herein, we extend these findings using human pancreas-derived MSC (Panc-MSC) as "biofactories" to enrich for tissue regenerative stimuli housed within distinct compartments of the secretome. Specifically, we utilized 100 kDa ultrafiltration as a simple method to debulk protein mass and to enrich for EVs while concentrating the MSC secretome into an injectable volume for preclinical assessments in murine models of blood vessel and islet regeneration. EV enrichment (EV+) was validated using nanoscale flow cytometry and atomic force microscopy, in addition to the detection of classical EV markers CD9, CD81, and CD63 using label-free mass spectrometry. EV+ CM was predominately enriched with mediators of wound healing and epithelial-to-mesenchymal transition that supported functional regeneration in mesenchymal and nonmesenchymal tissues. For example, EV+ CM supported human microvascular endothelial cell tubule formation in vitro and enhanced the recovery of blood perfusion following intramuscular injection in nonobese diabetic/severe combined immunodeficiency mice with unilateral hind limb ischemia. Furthermore, EV+ CM increased islet number and β cell mass, elevated circulating insulin, and improved glycemic control following intrapancreatic injection in streptozotocin-treated mice. Collectively, this study provides foundational evidence that Panc-MSC, readily propagated from the subculture of human islets, may be utilized for regenerative medicine applications.
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Affiliation(s)
- Tyler T. Cooper
- Department of Physiology and Pharmacology, Western University, London, Canada
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
- Don Rix Protein Identification Facility, Department of Biochemistry and Western University, London, Canada
| | - Stephen E. Sherman
- Department of Physiology and Pharmacology, Western University, London, Canada
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
| | - Gillian I. Bell
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
| | - Thamara Dayarathna
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
| | | | - Jun Ma
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
- Don Rix Protein Identification Facility, Department of Biochemistry and Western University, London, Canada
| | | | - Stephen H. Pasternak
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
| | - Gilles A. Lajoie
- Don Rix Protein Identification Facility, Department of Biochemistry and Western University, London, Canada
| | - David A. Hess
- Department of Physiology and Pharmacology, Western University, London, Canada
- Molecular Medicine Research Laboratories, Robarts Research Institute, London, Canada
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Villamagna IJ, McRae DM, Borecki A, Mei X, Lagugné-Labarthet F, Beier F, Gillies ER. GSK3787-Loaded Poly(Ester Amide) Particles for Intra-Articular Drug Delivery. Polymers (Basel) 2020; 12:E736. [PMID: 32224867 PMCID: PMC7240550 DOI: 10.3390/polym12040736] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 02/16/2020] [Accepted: 03/16/2020] [Indexed: 01/04/2023] Open
Abstract
Osteoarthritis (OA) is a debilitating joint disorder affecting more than 240 million people. There is no disease modifying therapeutic, and drugs that are used to alleviate OA symptoms result in side effects. Recent research indicates that inhibition of peroxisome proliferator-activated receptor δ (PPARδ) in cartilage may attenuate the development or progression of OA. PPARδ antagonists such as GSK3787 exist, but would benefit from delivery to joints to avoid side effects. Described here is the loading of GSK3787 into poly(ester amide) (PEA) particles. The particles contained 8 wt.% drug and had mean diameters of about 600 nm. Differential scanning calorimetry indicated the drug was in crystalline domains in the particles. Atomic force microscopy was used to measure the Young's moduli of individual particles as 2.8 MPa. In vitro drug release studies showed 11% GSK3787 was released over 30 days. Studies in immature murine articular cartilage (IMAC) cells indicated low toxicity from the drug, empty particles, and drug-loaded particles and that the particles were not taken up by the cells. Ex vivo studies on murine joints showed that the particles could be injected into the joint space and resided there for at least 7 days. Overall, these results indicate that GSK3787-loaded PEA particles warrant further investigation as a delivery system for potential OA therapy.
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Affiliation(s)
- Ian J. Villamagna
- School of Biomedical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada;
- Bone and Joint Institute, The University of Western Ontario, London, ON N6A 5B9, Canada; (F.L.-L.); (F.B.)
| | - Danielle M. McRae
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
| | - Aneta Borecki
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
| | - Xueli Mei
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
| | - François Lagugné-Labarthet
- Bone and Joint Institute, The University of Western Ontario, London, ON N6A 5B9, Canada; (F.L.-L.); (F.B.)
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
| | - Frank Beier
- Bone and Joint Institute, The University of Western Ontario, London, ON N6A 5B9, Canada; (F.L.-L.); (F.B.)
- Department of Physiology and Pharmacology, The University of Western Ontario, London, ON N6A 3B7, Canada
| | - Elizabeth R. Gillies
- School of Biomedical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada;
- Bone and Joint Institute, The University of Western Ontario, London, ON N6A 5B9, Canada; (F.L.-L.); (F.B.)
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada
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6
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Affiliation(s)
- Danielle M McRae
- Department of Chemistry, The University of Western Ontario (Western University), London, Ontario, Canada
| | - François Lagugné-Labarthet
- Department of Chemistry, The University of Western Ontario (Western University), London, Ontario, Canada.
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7
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Wallace GQ, McRae DM, Lagugné-Labarthet F. Probing mid-infrared plasmon resonances in extended radial fractal structures. Opt Lett 2019; 44:3865-3868. [PMID: 31368988 DOI: 10.1364/ol.44.003865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 06/30/2019] [Indexed: 06/10/2023]
Abstract
Infrared (IR) antennas made of metallic nanostructures are widely tunable from the near- to the far-IR range. They can be utilized for a variety of applications such as light harvesting and photonic filters, and their structural linear or circular anisotropy can be exploited to further enhance the sensitivity of spectroscopic measurements. Here gold dendritic fractal structures that were optimized to exhibit multiple resonances in the mid-IR range were characterized using a scattering-type scanning near-field optical IR microscope. The spatially resolved IR maps associated with the individual modes serve as a basis to understand the mode evolution between each fractal generation.
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8
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Marshall WS, Bird MD, Larbalestier DC, McRae DM, Noyes PD, Voran AJ, Walsh RP. Fabrication and Testing of a Bi-2223 Test Coil for High Field NMR Magnets. IEEE Trans Appl Supercond 2018; 28:4301204. [PMID: 30122885 PMCID: PMC6095665 DOI: 10.1109/tasc.2018.2801296] [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] [Indexed: 05/06/2023]
Abstract
In 2005 the Committee on Opportunities in High Magnetic Fields (COHMAG) issued a challenge to develop a 30 T high-resolution NMR magnet. In response, the National High Magnetic Field Laboratory (NHMFL) is investigating all three commercially available high-temperature superconductors (HTS) including REBCO, Bi-2212 and most recently, a reinforced Bi-2223 conductor supplied by Sumitomo Electric, designated Type HT-NX. Recent investigations of Type HT-NX conductor at the NHMFL and by others suggest that operation at hoop stress above 400 MPa, and total strain above 0.7% may be feasible. We have fabricated a test coil from a single 240 m length of HT-NX. The coil was successfully operated to 19.5 T in a 14 T background field, with a total applied strain of 0.8% and coil current density of 243 A/mm2. The coil was cycled 20 times from half the design current to full current without observed degradation.
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Affiliation(s)
- W S Marshall
- National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
| | - M D Bird
- National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
| | - D C Larbalestier
- National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
| | - D M McRae
- National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
| | - P D Noyes
- National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
| | - A J Voran
- National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
| | - R P Walsh
- National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
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Godeke A, Abraimov DV, Arroyo E, Barret N, Bird MD, Francis A, Jaroszynski J, Kurteva DV, Markiewicz WD, Marks EL, Marshall WS, McRae DM, Noyes PD, Pereira RCP, Viouchkov YL, Walsh RP, White JM. A Feasibility Study of High-Strength Bi-2223 Conductor for High-Field Solenoids. Supercond Sci Technol 2017; 30:035011. [PMID: 28360455 PMCID: PMC5367628 DOI: 10.1088/1361-6668/aa5582] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We performed a feasibility study on a high-strength Bi2-x Pb x Sr2Ca2Cu3O10-x (Bi-2223) tape conductor for high-field solenoid applications. The investigated conductor, DI-BSCCO Type HT-XX, is a pre-production version of Type HT-NX, which has recently become available from Sumitomo Electric Industries (SEI). It is based on their DI-BSCCO Type H tape, but laminated with a high-strength Ni-alloy. We used stress-strain characterizations, single- and double-bend tests, easy- and hard-way bent coil-turns at various radii, straight and helical samples in up to 31.2 T background field, and small 20-turn coils in up to 17 T background field to systematically determine the electro-mechanical limits in magnet-relevant conditions. In longitudinal tensile tests at 77 K, we found critical stress- and strain-levels of 516 MPa and 0.57%, respectively. In three decidedly different experiments we detected an amplification of the allowable strain with a combination of pure bending and Lorentz loading to ≥ 0.92% (calculated elastically at the outer tape edge). This significant strain level, and the fact that it is multi-filamentary conductor and available in the reacted and insulated state, makes DI-BSCCO HT-NX highly suitable for very high-field solenoids, for which high current densities and therefore high loads are required to retain manageable magnet dimensions.
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Affiliation(s)
- A Godeke
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - D V Abraimov
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - E Arroyo
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - N Barret
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - M D Bird
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - A Francis
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - J Jaroszynski
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - D V Kurteva
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - W D Markiewicz
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - E L Marks
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - W S Marshall
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - D M McRae
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - P D Noyes
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - R C P Pereira
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - Y L Viouchkov
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - R P Walsh
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
| | - J M White
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 31310, USA,
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Berman SM, Shah B, Wyle FA, Dacosta-Iyer M, McRae DM. Disseminated Pneumocystis carinii in a patient receiving aerosolized pentamidine prophylaxis. West J Med 1990; 153:82-6. [PMID: 2202161 PMCID: PMC1002484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- S M Berman
- Medical Service, VA Medical Center, Long Beach, CA 90822
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Dearden LC, Fairshter RD, McRae DM, Smith WR, Glauser FL, Wilson AF. Pulmonary ultrastructure of the late aspects of human paraquat poisoning. Am J Pathol 1978; 93:667-80. [PMID: 213978 PMCID: PMC2018348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The pulmonary ultrastructure of the late aspects of a case of human paraquat poisoning is investigated and compared with normal human pulmonary ultrastructure. Alveoli in the paraquat patient are numerically reduced in comparison to the control. They are filled with edematous proteinaceous plasma-like fluid containing erythrocytes, macrophages, leukocytes, fibroblast-like cells, platelets, and fibrin. These alveoli are lined by granular pneumocytes. Interstitial areas in the paraquat patient are greatly expanded and there are no alveolar septums. Interstitial areas contain proteinaceous plasma-like material, collagen, fibrin, platelets, mature fibroblasts, plasma cells, many leukocytes, numerous erythrocytes, and capillaries. Capillary permeability seems to be enhanced in the paraquat patient either by vesicles forming transendothelial channels or pores or by disruption of endothelial cells.
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Smith WR, Glauser FL, Dearden LC, Wells ID, Novey HS, McRae DM, Reid JS, Newcomb KA. Deposits of immunoglobulin and complement in the pulmonary tissue of patients with "heroin lung". Chest 1978; 73:471-6. [PMID: 344011 DOI: 10.1378/chest.73.4.471] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Pulmonary tissues from six patients who died with a clinical diagnosis of "heroin lung" (heroin-induced pulmonary edema) were examined with the light microscope and electron microscope. Immunofluorescent microscopic analysis revealed multifocal granular alveolar septal deposits of IgM in all patients, C3 complement in five patients, IgG in four patients, fibrinogen in three patients, and IgA in two patients. IgM, IgG, IgA, and C3 complement were eluted from the lungs of these addicts with citrate buffer with a low pH. No deposition of albumin was found in any of the specimens. These findings are believed to represent the first report of immune complexes in the alveolar capillary membrane in patients with heroin-induced pulmonary edema. Electron-microscopic studies revealed a proteinaceous plasma-like fluid in the alveolar spaces, thereby confirming the heroin induced pulmonary edema. Mechanisms of transport of edematous fluids from alveolar capillaries to alveolar spaces in lungs from heroin addicts are considered.
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Nissen ED, Kent DR, Nissen SE, McRae DM. Association of liver tumors with oral contraceptives. Obstet Gynecol 1976; 48:49-55. [PMID: 180466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Benign hepatocellular neoplasia occurring in 22 women receiving oral contraceptive steroids but no other known hepatotoxins is reported for the first time from a registry for liver tumors associated with oral contraceptives. A review of recent literature has yielded 45 cases including 3 previously reported by the authors. This striking increase in what were formerly rare primary liver tumors in young women strongly suggests a cause and effect of relationship. Eighteen patients presented with intrahepatic or extrahepatic rupture and hemoperitoneum with hemorrhagic shock due to vascular changes within their liver tumors. Five died as a direct or indirect result of preoperative or postoperative blood loss. The predominant lesions were focal nodular hyperplasia, hepatic adenoma, and hamartoma. Multiple synonymous nomenclature used to describe the histopathology of these tumors is disquieting and requires clarification. For diagnosis, enzyme determinations are not helpful. However, radionucleide liver scans, sonography, and celiac arteriography may be of value. Clinical surveillance must be the primary means for identification of this potentially lethal adverse phenomenon among 50,000,000 oral contraceptive users.
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Gazzaniga AB, Elliott MP, Sperling DR, Dietrick WR, Eiseman JT, McRae DM, Bartlett RH. Microporous expanded polytetrafluoroethylene arterial prosthesis for construction of aortopulmonary shunts: experimental and clinical results. Ann Thorac Surg 1976; 21:322-7. [PMID: 1267515 DOI: 10.1016/s0003-4975(10)64320-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A new microporous, expanded polytetrafluoroethylene arterial prosthesis was evaluated in dogs. The material appears to produce an adequate prosthesis for aortopulmonary anastomosis in animals and can conduct a high rate of blood flow. The graft has been used in 3 patients with pulmonary atresia aged 2 days, 2 months, and 6 months. Thus far all patients are well, growing, and have a loud shunt murmur. The desirable features of this type of anastomosis are presented.
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