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Roy R, York E, Pacchini E, Rawling T. Effects of cationic head group structure on cytotoxicity and mitochondrial actions of amphiphilic ionic liquids. Food Chem Toxicol 2024; 183:114202. [PMID: 38007213 DOI: 10.1016/j.fct.2023.114202] [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: 08/08/2023] [Revised: 10/24/2023] [Accepted: 11/17/2023] [Indexed: 11/27/2023]
Abstract
Ionic liquids (ILs) are a class of low melting point salts with physicochemical properties that make them suitable for a range of industrial applications. Accumulating evidence suggests that certain ILs are cytotoxic and potential environmental pollutants, thus understanding the structural features that promote IL cytotoxicity is important. Amphiphilic ionic liquids (AmILs), a class of ILs with lipophilic N-alkyl chains, containing aromatic head groups are generally more cytotoxic than their aliphatic counterparts, however the impact of other head group properties are less clear. This study therefore sought to provide new structure activity relationship (SAR) insights regarding the role of the cationic head group on AmIL cytotoxicity. A series of AmILs bearing a range of structurally diverse aromatic cations varying in size, charge, and lipophilicity was synthesised and screened against human MDA-MB-231 breast cancer cells. It was found that larger and more lipophilic head groups increased cytotoxicity, although the magnitude of the changes were modest. The mitochondrial effects of representative ILs were assessed. The AmILs induced mitochondrial dysfunction in MDA-MB-231 cells at cytotoxic concentrations, suggesting that they target mitochondria. The new SAR information from this study may assist in the design of AmILs with controlled cytotoxicity.
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Affiliation(s)
- Ritik Roy
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Edward York
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Ethan Pacchini
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Tristan Rawling
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
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York E, McNaughton DA, Duman MN, Gale PA, Rawling T. Fatty Acid-Activated Proton Transport by Bisaryl Anion Transporters Depolarises Mitochondria and Reduces the Viability of MDA-MB-231 Breast Cancer Cells. Biomolecules 2023; 13:1202. [PMID: 37627266 PMCID: PMC10452527 DOI: 10.3390/biom13081202] [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: 06/08/2023] [Revised: 07/21/2023] [Accepted: 07/26/2023] [Indexed: 08/27/2023] Open
Abstract
In respiring mitochondria, the proton gradient across the inner mitochondrial membrane is used to drive ATP production. Mitochondrial uncouplers, which are typically weak acid protonophores, can disrupt this process to induce mitochondrial dysfunction and apoptosis in cancer cells. We have shown that bisaryl urea-based anion transporters can also mediate mitochondrial uncoupling through a novel fatty acid-activated proton transport mechanism, where the bisaryl urea promotes the transbilayer movement of deprotonated fatty acids and proton transport. In this paper, we investigated the impact of replacing the urea group with squaramide, amide and diurea anion binding motifs. Bisaryl squaramides were found to depolarise mitochondria and reduce MDA-MB-231 breast cancer cell viability to similar extents as their urea counterpart. Bisaryl amides and diureas were less active and required higher concentrations to produce these effects. For all scaffolds, the substitution of the bisaryl rings with lipophilic electron-withdrawing groups was required for activity. An investigation of the proton transport mechanism in vesicles showed that active compounds participate in fatty acid-activated proton transport, except for a squaramide analogue, which was sufficiently acidic to act as a classical protonophore and transport protons in the absence of free fatty acids.
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Affiliation(s)
- Edward York
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia; (E.Y.)
| | - Daniel A. McNaughton
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia; (E.Y.)
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Meryem-Nur Duman
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia; (E.Y.)
| | - Philip A. Gale
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia; (E.Y.)
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
- The University of Sydney Nano Institute (SydneyNano), The University of Sydney, Sydney, NSW 2006, Australia
| | - Tristan Rawling
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia; (E.Y.)
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MacDermott-Opeskin H, Clarke C, Wu X, Roseblade A, York E, Pacchini E, Roy R, Cranfield C, Gale PA, O'Mara ML, Murray M, Rawling T. Protonophoric and mitochondrial uncoupling activity of aryl-carbamate substituted fatty acids. Org Biomol Chem 2022; 21:132-139. [PMID: 36453203 DOI: 10.1039/d2ob02049a] [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: 12/05/2022]
Abstract
Aryl-urea substituted fatty acids are protonophores and mitochondrial uncouplers that utilise a urea-based synthetic anion transport moiety to carry out the protonophoric cycle. Herein we show that replacement of the urea group with carbamate, a functional group not previously reported to possess anion transport activity, produces analogues that retain the activity of their urea counterparts. Thus, the aryl-carbamate substituted fatty acids uncouple oxidative phosphorylation and inhibit ATP production by collapsing the mitochondrial proton gradient. Proton transport proceeds via self-assembly of the deprotonated aryl-carbamates into membrane permeable dimeric species, formed by intermolecular binding of the carboxylate group to the carbamate moiety. These results highlight the anion transport capacity of the carbamate functional group.
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Affiliation(s)
- Hugo MacDermott-Opeskin
- Research School of Chemistry, College of Science, The Australian National University, Canberra, ACT, 0200, Australia
| | - Callum Clarke
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
| | - Xin Wu
- School of Chemistry, The University of Sydney, NSW, 2006, Australia.,School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, QLD 4072, Australia
| | - Ariane Roseblade
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
| | - Edward York
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
| | - Ethan Pacchini
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
| | - Ritik Roy
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
| | - Charles Cranfield
- School of Life Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Philip A Gale
- School of Chemistry, The University of Sydney, NSW, 2006, Australia.,The University of Sydney Nano Institute (SydneyNano), The University of Sydney, NSW, 2006, Australia
| | - Megan L O'Mara
- Research School of Chemistry, College of Science, The Australian National University, Canberra, ACT, 0200, Australia.,Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD 4072, Australia
| | - Michael Murray
- Discipline of Pharmacology, School of Medical Sciences, The University of Sydney, NSW 2006, Australia
| | - Tristan Rawling
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW, 2007, Australia.
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York E, Guevara J, Gómez J, Corripio R, Zapata C, Recarte M, Sánchez J, Larrañaga I, Fondevila C. Fluorescence guided fully endoscopic axillary dissection for locally advanced breast cancer. A feasible novel technique. Eur J Cancer 2022. [DOI: 10.1016/s0959-8049(22)01421-6] [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: 11/19/2022]
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York E, McNaughton DA, Roseblade A, Cranfield CG, Gale PA, Rawling T. Structure-Activity Relationship and Mechanistic Studies of Bisaryl Urea Anticancer Agents Indicate Mitochondrial Uncoupling by a Fatty Acid-Activated Mechanism. ACS Chem Biol 2022; 17:2065-2073. [PMID: 35854216 DOI: 10.1021/acschembio.1c00807] [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: 11/29/2022]
Abstract
Targeting the cancer cell mitochondrion is a promising approach for developing novel anticancer agents. The experimental anticancer agent N,N'-bis(3,5-dichlorophenyl)urea (SR4) induces apoptotic cell death in several cancer cell lines by uncoupling mitochondrial oxidative phosphorylation (OxPhos) using a protein-free mechanism. However, the precise mechanism by which SR4 depolarizes mitochondria is unclear because SR4 lacks an acidic functional group typically found in protein-independent uncouplers. Recently, it was shown that structurally related thioureas can facilitate proton transport across lipid bilayers by a fatty acid-activated mechanism, in which the fatty acid acts as the site of protonation/deprotonation and the thiourea acts as an anion transporter that shuttles deprotonated fatty acids across the phospholipid bilayer to enable proton leak. In this paper, we show that SR4-mediated proton transport is enhanced by the presence of free fatty acids in the lipid bilayer, indicating that SR4 uncouples mitochondria through the fatty acid-activated mechanism. This mechanistic insight was used to develop a library of substituted bisaryl ureas for structure-activity relationship studies and subsequent cell testing. It was found that lipophilic electron-withdrawing groups on bisaryl ureas enhanced electrogenic proton transport via the fatty acid-activated mechanism and had the capacity to depolarize mitochondria and reduce the viability of MDA-MB-231 breast cancer cells. The most active compound in the series reduced cell viability with greater potency than SR4 and was more effective at inhibiting adenosine triphosphate production.
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Affiliation(s)
- Edward York
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia
| | | | - Ariane Roseblade
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia
| | - Charles G Cranfield
- School of Life Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia
| | - Philip A Gale
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia.,The University of Sydney Nano Institute (SydneyNano), The University of Sydney, Sydney, NSW 2006, Australia
| | - Tristan Rawling
- School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia
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Oliver-Goldaracena J, Sanchez Mendez J, Martí C, York E, Zamora P, Cordoba Chicote V, Roca Navarro M, Garrido Alonso D, Navarro Monforte Y. Ultrasound-guided cryoablation as substitute for surgery in elderly patients with non resected breast cancer: pilot study with medium-term outcomes. Breast 2021. [DOI: 10.1016/s0960-9776(21)00258-7] [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: 11/29/2022] Open
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York E, S. R, Zapata C. C, Escabias C, Osorio S. I, Sánchez M J, Diez S J, Quadros B P, Diaz D. J. How I do it: Lymphatic mapping and sentinel lymph node biopsy with Indocianine Green in Breast Cancer patients, a prospective trial experience. Eur J Cancer 2020. [DOI: 10.1016/s0959-8049(20)30593-1] [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: 11/24/2022]
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Osorio-Silla I, Gómez Valdazo A, Sánchez Méndez JI, York E, Díaz-Almirón M, Gómez Ramírez J, Rivas Fidalgo S, Oliver JM, Álvarez CM, Hardisson D, Díaz Miguel M, Lobo F, Díaz Domínguez J. Is it always necessary to perform an axillary lymph node dissection after neoadjuvant chemotherapy for breast cancer? Ann R Coll Surg Engl 2019; 101:186-192. [PMID: 30421628 PMCID: PMC6400929 DOI: 10.1308/rcsann.2018.0196] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [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] [Accepted: 09/10/2018] [Indexed: 12/28/2022] Open
Abstract
INTRODUCTION Recent prospective studies support the feasibility of performing sentinel lymph node biopsy following neoadjuvant chemotherapy in initially fine-needle aspiration cytology or ultrasound-guided biopsy-proven node-positive breast cancer. The main aid is to identify preoperative features that help us predict a complete axillary response to neoadjuvant chemotherapy in these patients and thus select the candidates for sentinel lymph node biopsy post-neoadjuvant chemotherapy to avoid unnecessary axillary lymphadenectomy. MATERIALS AND METHODS A retrospective observational study with a total of 150 patients, biopsy-proven node-positive breast cancer who underwent neoadjuvant chemotherapy followed by breast surgery and axillary lymphadenectomy were included and retrospectively analysed. A predictive model was generated by a multivariate logistic regression analysis for pathological complete response-dependent variable. RESULTS The response of the primary lesion to neoadjuvant chemotherapy according to post-treatment magnetic resonance imaging, Her2/neu overexpression and a low estrogen receptor expression are associated with a higher rate of nodal pathologically complete response. The multivariant model generated a receiver operating characteristic curve with an area under the curve of 0.79 and a confidence interval of 0.72-0.87 at a 95% level of significance. CONCLUSIONS This model could be a helpful tool for the surgeon to help in predicting which cases have a higher likelihood of achieving a pathologically complete response and therefore selecting those who may benefit from a post-neoadjuvant chemotherapy sentinel lymph node biopsy and avoid unnecessary axillary lymphadenectomy.
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Affiliation(s)
- I Osorio-Silla
- Department of Surgery, Hospital Universitario La Pa , Madrid , Spain
| | - A Gómez Valdazo
- Department of Surgery, Hospital Universitario Fundación Jiménez Díaz , Madrid , Spain
| | - J I Sánchez Méndez
- Department of Gynaecology and Obstetrics, Hospital Universitario La Paz , Madrid , Spain
| | - E York
- Department of Surgery, Hospital Universitario La Pa , Madrid , Spain
| | - M Díaz-Almirón
- Department of Surgery, Hospital Universitario La Pa , Madrid , Spain
| | - J Gómez Ramírez
- Department of Surgery, Hospital Universitario Fundación Jiménez Díaz , Madrid , Spain
| | - S Rivas Fidalgo
- Department of Surgery, Hospital Universitario Fundación Jiménez Díaz , Madrid , Spain
| | - J M Oliver
- Department of Radiology, Hospital Universitario La Paz , Madrid , Spain
| | - C M Álvarez
- Department of Gynaecology and Obstetrics, Hospital Universitario La Paz , Madrid , Spain
| | - D Hardisson
- Department of Pathology, Hospital Universitario La Paz , Madrid , Spain
| | - M Díaz Miguel
- Department of Surgery, Hospital Universitario Fundación Jiménez Díaz , Madrid , Spain
| | - F Lobo
- Department of Oncology, Hospital Universitario Fundación Jiménez Díaz , Madrid , Spain
| | - J Díaz Domínguez
- Department of Surgery, Hospital Universitario La Pa , Madrid , Spain
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Ng T, Yu H, York E, Leedy S, Gao D, Heasley L, Hirsch F, Camidge D. P2.02-011 Clinical and Molecular Features of Lung Cancers with Increased FGFR1 mRNA and/or Gene Copy Number. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1188] [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: 10/18/2022]
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Abstract
BACKGROUND Energy or calorie restriction (CR) has consistently been shown to produce weight loss and have beneficial health effects in numerous species, including primates and humans. Most individuals, however, are unable to sustain weight losses induced through reductions in energy intake, potentially due to increased hunger levels. The effects that prolonged CR has on subjective aspects of appetite have not been well studied. Thus, the present study tested the effect of 6 months of caloric restriction on appetite in healthy, overweight men and women. METHODS Forty-eight overweight men and women with a body mass index (BMI; kg m(-2)) between 25-29.9 took part in a 6-month study and were randomised into one of four groups: healthy diet (control); 25% CR; 12.5% CR plus exercise (12.5% increased energy expenditure; CR + EX); low-calorie diet [LCD; 3724 kJ day(-1) (890 kcal day(-1)) until 15% of initial body weight was lost, then maintenance]. Appetite markers (i.e. hunger, fullness, desire to eat, etc.) were assessed weekly during a fasting state. RESULTS Body weight was significantly reduced in all three energy-restricted groups (CR = -10.4 +/- 0.9%; CR + EX = -10.0 +/- 0.8%; and LCD = -13.9 +/-0.7%), indicating that participants were adherent to their energy restriction regimen, whereas the healthy diet control group remained weight stable (control = -1.0 +/- 1.1%). Despite these significant weight losses, appetite ratings of participants in the three energy-restricted groups at month 6 were similar to the weight stable control group. CONCLUSIONS CR regimens with low fat diets producing significant weight losses have similar effects on appetite markers over a 6-month time period compared to a weight stable control group.
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Affiliation(s)
- S D Anton
- Pennington Biomedical Research Center, Baton Rouge, LA, USA.
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York E. A Comprehensive Guide to Music Therapy. J Music Ther 2003. [DOI: 10.1093/jmt/40.2.171] [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: 11/14/2022]
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Yamamoto H, Sejbal J, York E, Stewart JM, Possani LD, Kotovych G. An nmr conformational analysis of a synthetic peptide Cn2(1-15)NH2-S-S-acetyl-Cn2(52-66)NH2 from the New World Centruroides noxius 2 (Cn2) scorpion toxin: comparison of the structure with those of the Centruroides scorpion toxins. Biopolymers 1999; 49:277-86. [PMID: 10079767 DOI: 10.1002/(sici)1097-0282(19990405)49:4<277::aid-bip2>3.0.co;2-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 11/09/2022]
Abstract
The solution structure of a synthetic peptide, Cn2(1-15)NH2-S-S-acetyl-Cn2(52-66)NH2 from toxin 2 (Cn2) of the New World scorpion Centruroides noxius was determined using nmr and molecular dynamics calculations. The peptide has no significant secondary structure such as an alpha-helix or a beta-sheet, yet it has a fixed conformation for the first chain. The backbone secondary structure involving residues 6-12 in this peptide shows an excellent overlap with the structures of natural neurotoxins from Centruroides sculpturatus Ewing. Residues 6-9 form a distorted type I beta-turn and residues 10-12 form a gamma-turn. As residues 7-10 in the Centruroides toxins correspond to one of the regions of highest sequence variability, it may account for the species specificity and/or selectivity of toxic action. The conformation of this region evidently plays an important role in receptor recognition and in binding to the neutralizing monoclonal antibody BCF2 raised against the intact toxin.
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Affiliation(s)
- H Yamamoto
- Department of Chemistry, University of Alberta, Edmonton, Canada
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York E, Hodgson MJ, Cooper BW, McKay CA. Noxious fumes in a medical center: chemical and psychological aspects. Conn Med 1998; 62:71-4. [PMID: 9542287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A group of operating room personnel at a medical center in Connecticut reported severe respiratory irritation manifested by either proxysmal cough or throat irritation suggestive of a noxious fume exposure, 13 April 1994. However, persistent complaints on 14 April 1994 were significantly different and more suggestive of a psychological reaction. By careful interviewing, physical examination, toxicological assays, and epidemiological investigation, the true nature of a mixed physiological and psychological episode was delineated. Enlightened management policy enabled rapid restoration of return to work with minimal economic loss.
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Affiliation(s)
- E York
- Health Service, Hartford Hospital, USA
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York E. Occupational medicine and the medical center. Conn Med 1994; 58:587-9. [PMID: 7995037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Eisenfeld L, Perl L, Burke G, Blackington S, York E, Regan H, Siddell E, Holman M. Lack of compliance with influenza immunization for caretakers of neonatal intensive care unit patients. Am J Infect Control 1994; 22:307-11. [PMID: 7847638 DOI: 10.1016/0196-6553(94)90018-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [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: 01/27/2023]
Abstract
BACKGROUND Both the Centers for Disease Control and Prevention and the American Academy of Pediatrics have recommended influenza immunizations for neonatal intensive care unit staff. Compliance rates for influenza immunization among neonatal intensive care unit staff have not yet been reported. METHODS To determine both the rates and the associated factors for compliance between 1990 and 1993 among neonatal intensive care unit nursing staff, interviews were conducted at three Hartford area hospitals by means of a structured questionnaire. RESULTS Compliance rates at the three hospitals were 15% in 1990 to 1991, 20% in 1991 to 1992, and 17% in 1992 to 1993 (89% sampling of all nurses with direct patient care). Sixty-three percent were not immunized between 1991 and 1993, 26% were vaccinated once, 9% were vaccinated twice, and 2% were vaccinated three times within the 3-year period. Convictions regarding vaccine safety and effectiveness, concern about getting influenza, and awareness of national recommendations for annual influenza immunization were shown to be associated with vaccination compliance. Concern over exposing neonates, peer influence, pain from injection, and previous adverse reaction were not statistically significant factors differentiating compliers from noncompliers. CONCLUSIONS There is a poor acceptance of the influenza vaccine among our neonatal intensive care unit nursing staff. Educational and research efforts directed toward influenza risks among neonates and vaccine safety and effectiveness, along with incentives to comply, may improve compliance rates.
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Affiliation(s)
- L Eisenfeld
- Department of Pediatrics, Hartford Hospital, CT 06115
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York E. Age 60 rule. Aviat Space Environ Med 1994; 65:274. [PMID: 8185562] [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: 05/22/2023]
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York E. A survey of blood lipid levels of airline pilot applicants. Aviat Space Environ Med 1993; 64:346. [PMID: 8476376] [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: 01/31/2023]
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York E. Exercise in controlling serum lipid levels. Arch Intern Med 1989; 149:223. [PMID: 2912411] [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: 01/03/2023]
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York E. Fiber/fat/carbohydrates in weight loss. Am J Public Health 1987; 77:514-5. [PMID: 3826476 PMCID: PMC1646946 DOI: 10.2105/ajph.77.4.514-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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York E. Cholesterol and exercise. JAMA 1987; 257:1601. [PMID: 3820475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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York E. Diet, exercise, and bone mineral content. Ann Intern Med 1985; 102:418. [PMID: 3970494 DOI: 10.7326/0003-4819-102-3-418_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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Abstract
Regional cerebral blood flow measurements and neuropsychological testing were conducted before and after venesection on 6 patients with polycythemia secondary to chronic obstructive pulmonary disease. Venesection resulted in lowered viscosity and hematocrit, and an accompanying improvement in cerebral perfusion and mental function. Blood flow was significantly increased in the left cerebral hemisphere following phlebotomy, and there was significant improvement in sensory/mental function. Cerebral function would appear to be related to blood flow alterations influenced by the viscosity of the blood.
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York E. Beards and bacteria. J Maine Med Assoc 1972; 63:67 passim. [PMID: 5018380] [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: 01/13/2023]
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York E, Brierre JT. How diligently should the diagnosis of sickle cell trait be pursued? Clinical case report with military implication. Mil Med 1971; 136:27-9. [PMID: 5005365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
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York E, Oleynik RJ, Patton RM. Human acceleration experience at the Aerospace Medical Research Department, U.S. Naval Air Development Center, Johnsville, 1 January 1961-30 December 1965. Aerosp Med 1968; 39:68-71. [PMID: 5635258] [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: 01/16/2023]
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York E, Oleynik RJ, Patton RM. Human acceleration experience at the Aerospace Medical Research Department, U.S. Naval Air Development Center-Johnsville. 1 January 1961-30 December 1965. NADC-MR-6711. NADC-MR Rep 1967:1-8. [PMID: 5300767] [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: 01/14/2023]
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York E. Post-flight discomfort in aviators: aero atelectasis. Aerosp Med 1967; 38:192-4. [PMID: 6040345] [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: 01/18/2023]
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