1
|
Zermeño-Acosta M, Sumano H, Villar JLD, Bernad MJ, Gutiérrez L. Pharmacokinetics of doxycycline hyclate in pigs with a new feed premix formulation. J Vet Pharmacol Ther 2024; 47:107-113. [PMID: 38014818 DOI: 10.1111/jvp.13419] [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: 09/20/2023] [Revised: 11/03/2023] [Accepted: 11/10/2023] [Indexed: 11/29/2023]
Abstract
This study aimed to evaluate the administration of doxycycline hyclate in a long-acting pharmaceutical preparation in pigs when administered either ad libitum as a feed medication or an oral bolus dose. In all instances, the studied dose was 20 mg/kg b.w. A total of 48 healthy crossbred, castrated male pigs (Landrace-Yorkshire) weighing 23 ± 4.3 kg were included in this trial. They were randomly assigned to six groups as follows: two groups for the experimental prototype 1 of doxycycline hyclate administering it ad libitum (Fad-lib) or as forced bolus (Fbolus); two groups for the experimental prototype 2 of doxycycline hyclate as for the former groups (FCad-lib and FCbolus), and two control groups receiving the same dose of doxycycline hyclate, but of a commercial premix, also as previously explained (Cbolus and Cad-lib). Statistical analysis of the mean pharmacokinetic values was carried out with Kruskal-Wallis and Dunn's tests. The relative bioavailability (Fr) of the best prototype, when administered ad libitum (FCad-lib), was five times larger than the reference group (Cadlib). These results allow the proposal that the referred differences achieved in the presented prototypes can mark a notable clinical difference, particularly in pathogens with some resistance.
Collapse
Affiliation(s)
- Mónica Zermeño-Acosta
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, México City, Mexico
| | - Héctor Sumano
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, México City, Mexico
| | - Jorge Luna-Del Villar
- Departamento de Cirugía, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, México City, Mexico
| | - Maria Josefa Bernad
- Departamento de Farmacia, Facultad de Química, Universidad Nacional Autónoma de México, México City, Mexico
| | - Lilia Gutiérrez
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, México City, Mexico
| |
Collapse
|
2
|
Córdova-González D, Alfonseca-Silva E, Gutiérrez L, Tapia-Pérez G, Sumano H. Intramammary preparation of enrofloxacin hydrochloride-dihydrate for bovine mastitis (biofilm-forming Staphylococcus aureus). J Vet Sci 2024; 25:e6. [PMID: 38311321 PMCID: PMC10839182 DOI: 10.4142/jvs.23245] [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: 10/05/2023] [Revised: 11/07/2023] [Accepted: 11/14/2023] [Indexed: 02/07/2024] Open
Abstract
BACKGROUND Chronic bovine mastitis is linked to biofilm-producing Staphylococcus aureus (bp-Sa) or Staphylococcus coagulase-negative (bp-Scn). OBJECTIVES Bp-Sa and bp-Scn were treated with intramammary preparations of either enrofloxacin HCl·2H2O-dimethyl-sulfoxide-chitosan (enro-C/DMSO/chitosan) or enro-C alone. Their potential to inhibit and degrade biofilm formation in vitro was also assessed. METHODS Milk samples were obtained from the affected quarters in a herd. Phenotypical and genotypical identifications as biofilm-producing Staphylococcus species were carried out. Enro-C/DMSO/chitosan and enro-C alone were assessed to determine their in vitro efficacy in interfering with biofilm formation and their bactericidal effects. A prolonged eight-day treatment with a twice-daily intramammary insertion of 10 mL of enro-C/DMSO/chitosan or enro-C alone was set to evaluate the clinical and bacteriological cures on day 10 in 15 cows per group and the biofilm-inhibiting ability. RESULTS Fifty-seven percent of the isolates were identified as Staphylococcus spp., of which 50% were bp-Sa, 46% bp-Scn, and 4% Staphylococcus pseudintermedius. One hundred percent of the S. aureus isolated and 77% of Staphylococcus coagulase-negative were biofilm producers. In both groups, the icaA and icaD biofilm-producing genes were identified. The experimental preparation could inhibit biofilm formation, degrade mature biofilms, and have well-defined microbicidal effects on planktonic and biofilm bacteria. The respective clinical and bacteriological cure rates were 100% and 80% for enro-C/DMSO/chitosan and 41.7% and 25% for enro-C alone. CONCLUSIONS Enro-C/DMSO/chitosan eliminates bp-Sa and bp-Scn from cases of chronic bovine mastitis.
Collapse
Affiliation(s)
- Diana Córdova-González
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, México City 04510, México
| | - Edgar Alfonseca-Silva
- Departamento de Microbiología e Inmunología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, México City 04510, México
| | - Lilia Gutiérrez
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, México City 04510, México
| | - Graciela Tapia-Pérez
- Departamento de Genética y Bioestadística, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, México City 04510, México
| | - Héctor Sumano
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, México City 04510, México.
| |
Collapse
|
3
|
Gutiérrez L, Monroy-Barreto M, García-Guzmán P, Sumano H. Pharmaceutical Design of a Formulation of Enrofloxacin-Alginate and its Strategic Dosage to Achieve Mutant Prevention PK/PD Ratios in Broiler Chickens. Curr Pharm Des 2023; 29:1701-1709. [PMID: 37491855 DOI: 10.2174/1381612829666230724145657] [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: 12/07/2022] [Revised: 04/11/2023] [Accepted: 06/16/2023] [Indexed: 07/27/2023]
Abstract
INTRODUCTION The comparative pharmacokinetics (PK) and PK/pharmacodynamics (PD) ratios of a new pharmaceutical design of enrofloxacin-alginate in dried beads (EADBs) and the reference enrofloxacin 10% solution was determined in broiler chickens. Also, the same parameters were determined after administering enrofloxacin with a double dosing scheme (through drinking water and as an in-feed medication of EADBs). 500 Arbor-Acres broiler chickens were randomly divided into five groups (n=100), adjusting in all cases, a dose of 10 mg/kg based on water and feed intake as follows: group EADBsad-lib receiving enrofloxacin through EADBs added to their feed as dressing; group EADBsbolus forcing the beads into the proventriculus using a semi-rigid gavage; group Enroad-lib dosed through their drinking water; group Enrobolus also administered into the proventriculus by gavage; group Enrow&f administering 5 mg/kg as EADBs in their feed, plus 5 mg/kg of enrofloxacin through their drinking water. METHODS The PK parameters and the key PK/PD ratios were determined (Cmax/MIC and AUC0-24/MIC). Only group Enrow&f could achieve the PK/PD ratios regarded as mutant-prevention. RESULTS This trial is the first one in which an in-feed medication of enrofloxacin, combined with water dosing, can result in PK/PD parameters superior to those obtained after administering the drug through drinking water at a dose of 10 mg/kg. CONCLUSION Contrary to expectations, groups Enroad-lib and Enrobolus failed to achieve the desired PK/PD ratios when the breakpoint was established at 0.5 μg/mL but did so when MIC was set at 0.1 μg/mL. In contrast, EADBsbolus and Enrow&f achieved an adequate AUC0-24/MIC ratio for both MIC levels.
Collapse
Affiliation(s)
- Lilia Gutiérrez
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Ciudad de México 04510, México
| | - Minerva Monroy-Barreto
- Departamento de Química Analítica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México 04510, México
| | - Perla García-Guzmán
- Departamento de Sistemas Biológicos, Universidad Autónoma Metropolitana Xochimilco, Ciudad de México 04960, México
| | - Héctor Sumano
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Ciudad de México 04510, México
| |
Collapse
|
4
|
Pérez-Fonseca A, Gutiérrez L, Sumano H, Salem AZ, Ortega-Cerrilla ME, Villa-Mancera A, Alcala-Canto Y. Effect of dehydrated grapefruit peels on intestinal integrity and Eimeria invasion of caprine epithelial cells in vitro and anticoccidial activity in vivo. Small Rumin Res 2022. [DOI: 10.1016/j.smallrumres.2022.106663] [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: 11/16/2022]
|
5
|
Alfonseca-Silva E, Cruz-Villa JC, Gutiérrez L, Sumano H. Successful treatment of recurrent subclinical mastitis in cows caused by enrofloxacin resistant bacteria by means of the sequential intramammary infusion of enrofloxacin HCl-2H 2O and ceftiofur HCl: a clinical trial. J Vet Sci 2021; 22:e78. [PMID: 34697924 PMCID: PMC8636650 DOI: 10.4142/jvs.2021.22.e78] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 08/19/2021] [Accepted: 08/29/2021] [Indexed: 11/28/2022] Open
Abstract
Background Recurrent subclinical mastitis (RScM) due to resistant bacteria has low clinical and bacteriological cure rates, often requiring the culling of cows. The sequential intra-mammary administration of enrofloxacin hydrochloride-dihydrate (enro-C) followed by ceftiofur HCl may be useful for treating these cases. Objectives This study assessed the bacteriological and clinical cure-efficacies of the sequentially intramammary administration of enro-C, followed by ceftiofur HCl to treat RScM in Holstein/Friesian cows. Methods This trial was conducted in a herd with a high prevalence of RScM, and 20 Holstein/Friesian cows were included: 45% suffering subclinical mastitis and 38.9% of the mammary quarters affected. Twenty-nine bacterial isolates in vitro resistant to enro-C were obtained (coagulase-negative Staphylococcus spp, 55.2%; Staphylococcus aureus, 27.6%; Escherichia coli, 6.9%; Streptococcus uberis, 6.9%; Corynebacterium bovis, 3.4%). Polymerase chain reaction-isolated the following genes linked to enro-C resistance: chromosomal (gyrA) and plasmid (aac(6')-lb-cr). The treatments were as follows: twice-daily intramammary infusions of enro-C (300 mg/10 mL) for 5 days. Cows clinically considered treatment failures were also treated with intramammary ceftiofur (125 mg/10 mL, twice daily for 5 days. The clinical and bacteriological cure rates were carried out when completing each treatment phase and at 14 and 21 days, aided by a California mastitis test, somatic cell count, and failure to identify the initially causative bacteria. Results Enro-C achieved 65% clinical and bacteriological cure rates, and 100% cure rates were obtained after the rescue treatment with ceftiofur HCl. Conclusions Outstanding clinical and bacteriological cure rates in cows affected by RScM were achieved with the consecutive intramammary infusions of enro-C, followed by ceftiofur HCl.
Collapse
Affiliation(s)
- Edgar Alfonseca-Silva
- Department of Microbiology and Immunology, School of Veterinary Medicine, National Autonomous University of Mexico, Mexico City 04510, Mexico
| | - Juan Carlos Cruz-Villa
- Department of Microbiology and Immunology, School of Veterinary Medicine, National Autonomous University of Mexico, Mexico City 04510, Mexico
| | - Lilia Gutiérrez
- Department of Physiology and Pharmacology, School of Veterinary Medicine, National Autonomous University of Mexico, Mexico City 04510, Mexico
| | - Hector Sumano
- Department of Physiology and Pharmacology, School of Veterinary Medicine, National Autonomous University of Mexico, Mexico City 04510, Mexico.
| |
Collapse
|
6
|
Bonet M, Vázquez S, García E, Visus M, Jové D, Ripol O, Solé C, Gutiérrez L, Morales-Rull JL, Montero Á, Algara M, Arenas M, Mira M. Saving time in the radiotherapy procedures for COVID-19 pneumonia treatment. A single-institution experience. Clin Transl Oncol 2021; 23:2344-2349. [PMID: 34013493 PMCID: PMC8133050 DOI: 10.1007/s12094-021-02634-5] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 04/29/2021] [Indexed: 12/19/2022]
Abstract
Background The use of low dose radiotherapy (LD-RT) for the treatment of COVID-19 pneumonia is supported by biological rationale for its immunomodulatory effect. Some institutions have started to treat these patients showing encouraging results. To shorten procedure times is crucial for the comfort of symptomatic patients receiving respiratory support and to optimize institutional facilities. Patients and methods At our institution, LD-RT is offered to hospitalized patients with COVID-19 pneumonia and signs of early cytokine-released syndrome on behalf of a multicenter study. We designed a coordinated process flow starting from the patient transfer to the simulation CT-scan (first-step), to the end of the LD-RT treatment (last step). The times spent on each step of the process flow were evaluated. Results Mean age of treated patients was 83 (72–91) years-old. The timing parameters of the first 10 consecutive patients were analyzed. Except for the first (dummy run), patients were managed from the first to the last step in a median of 38 min (25–58, SD 10.67). The most time-consuming sub-process was the contouring of the treatment volumes and dosimetry. Conclusions LD-RT is not only an encouraging option for COVID-19 pneumonia patients, but a convenient and feasible procedure if performed in a coordinated way by reducing procedure times.
Collapse
Affiliation(s)
- M Bonet
- Radiation Oncology Department, Hospital Universitari Arnau de Vilanova, Av. Alcalde Rovira Roure, 80, 25198, Lleida, Spain.
| | - S Vázquez
- Radiation Oncology Department, Hospital Universitari Arnau de Vilanova, Av. Alcalde Rovira Roure, 80, 25198, Lleida, Spain
| | - E García
- Radiation Oncology Department, Hospital Universitari Arnau de Vilanova, Av. Alcalde Rovira Roure, 80, 25198, Lleida, Spain
- IRBLleida (Institut de Recerca Biomèdica de Lleida. Fundació Doctor Pifarré), Lleida, Spain
| | - M Visus
- Radiation Physics and Radioprotection Department, Hospital Universitari Arnau de Vilanova, Lleida, Spain
| | - D Jové
- Radiation Physics and Radioprotection Department, Hospital Universitari Arnau de Vilanova, Lleida, Spain
| | - O Ripol
- Radiation Physics and Radioprotection Department, Hospital Universitari Arnau de Vilanova, Lleida, Spain
| | - C Solé
- Internal Medicine Department, Hospital Universitari Arnau de Vilanova, Lleida, Spain
| | - L Gutiérrez
- Internal Medicine Department, Hospital Universitari Arnau de Vilanova, Lleida, Spain
| | - J L Morales-Rull
- IRBLleida (Institut de Recerca Biomèdica de Lleida. Fundació Doctor Pifarré), Lleida, Spain
- Internal Medicine Department, Hospital Universitari Arnau de Vilanova, Lleida, Spain
| | - Á Montero
- Radiation Oncology Department, Hospital Universitario HM Sanchinarro, Madrid, Spain
| | - M Algara
- Radiation Oncology Department, Parc de Salut Mar, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - M Arenas
- Radiation Oncology Department, Hospital Universitari Sant Joan de Reus, Universitat Rovira I VIrgili, Reus, Spain
| | - M Mira
- Radiation Oncology Department, Hospital Universitari Arnau de Vilanova, Av. Alcalde Rovira Roure, 80, 25198, Lleida, Spain
- IRBLleida (Institut de Recerca Biomèdica de Lleida. Fundació Doctor Pifarré), Lleida, Spain
| |
Collapse
|
7
|
Carrillo L, Bernad MJ, Monroy-Barreto M, Coello CL, Sumano H, Gutiérrez L. Higher Bioavailability of Calcium in Chickens With a Novel In-Feed Pharmaceutical Formulation. Front Vet Sci 2020; 7:343. [PMID: 32626729 PMCID: PMC7311573 DOI: 10.3389/fvets.2020.00343] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 05/18/2020] [Indexed: 01/10/2023] Open
Abstract
Egg production and egg shell quality decrease toward the end of the first laying cycle in hens (approximately by week 80). Even so, farmers often choose to work a second cycle with them. Defective egg shell production has been mainly linked to a decrease in gastrointestinal absorption of calcium. Here we studied pharmaceutically-designed modified-release small pellets (FOLAs) containing calcium to improve calcium bioavailability (F). The influence of FOLA alone or with capsicum-oleoresin was studied in a total of 400 Bovans-White hens randomly divided into four groups of 20 laying hens each and with five replicates per group (n = 100) as follows: (1) control group (GC) receiving a diet containing basal levels of 4.1% of calcium-carbonate; (2) group GF treated as GC but with the same dose of calcium-carbonate in FOLA; (3) group GFc5 was treated as GF but with 6 ppm of capsicum-oleoresin (500,000 Scoville Heat Units [SHU]); and (4) group GFc10 treated as GFc5 but with 1,000,000 SHU capsicum-oleoresin. Plasma concentrations of calcium were determined during 5 days at predetermined times sampling more often on days 1 and 5 for blood plasma kinetics of calcium. Relative bioavailability (Fr) values based on the area under the serum calcium concentration vs. time curve (AUC) were obtained and compared to GC. The AUC was statistically different among all groups (P < 0.5), but the GFc10 had the greatest Fr (194%), with serum calcium concentrations ranging from 25.37 to 31.2 μg/dL. Calcium residence time (RT) between GC and GF showed no statistical differences while GFc5 and GFc10 had statistically superior RT values. Simultaneously, the number of shell-less eggs per group and their thickness was evaluated by utilizing the same groups but with 150 hens per group on 6 days. Shell-less eggs decreased to zero in Group GFc10 and produced eggs with the greatest shell thickness from day 2 onwards. The inclusion of calcium-carbonate in the pharmaceutical form FOLA induced higher serum calcium concentrations (GF, GFc5, and GFc10) particularly during the night-phase of the hen's cycle—this coincides with the time at which egg shell formation occurs.
Collapse
Affiliation(s)
- Lizbeth Carrillo
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - María-José Bernad
- Departamento de Farmacia, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Minerva Monroy-Barreto
- Departamento de Química Analítica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Carlos L Coello
- Departamento de Medicina y Zootecnia de Aves, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Héctor Sumano
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Lilia Gutiérrez
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| |
Collapse
|
8
|
Guala A, Teixido-Tura G, Dux-Santoy L, Granato C, Ruiz-Muñoz A, Valente F, Galian-Gay L, Gutiérrez L, González-Alujas T, Johnson KM, Wieben O, Sao Avilés A, Evangelista A, Rodriguez-Palomares J. Decreased rotational flow and circumferential wall shear stress as early markers of descending aorta dilation in Marfan syndrome: a 4D flow CMR study. J Cardiovasc Magn Reson 2019; 21:63. [PMID: 31607265 PMCID: PMC6791020 DOI: 10.1186/s12968-019-0572-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 08/28/2019] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Diseases of the descending aorta have emerged as a clinical issue in Marfan syndrome following improvements in proximal aorta surgical treatment and the consequent increase in life expectancy. Although a role for hemodynamic alterations in the etiology of descending aorta disease in Marfan patients has been suggested, whether flow characteristics may be useful as early markers remains to be determined. METHODS Seventy-five Marfan patients and 48 healthy subjects were prospectively enrolled. In- and through-plane vortexes were computed by 4D flow cardiovascular magnetic resonance (CMR) in the thoracic aorta through the quantification of in-plane rotational flow and systolic flow reversal ratio, respectively. Regional pulse wave velocity and axial and circumferential wall shear stress maps were also computed. RESULTS In-plane rotational flow and circumferential wall shear stress were reduced in Marfan patients in the distal ascending aorta and in proximal descending aorta, even in the 20 patients free of aortic dilation. Multivariate analysis showed reduced in-plane rotational flow to be independently related to descending aorta pulse wave velocity. Conversely, systolic flow reversal ratio and axial wall shear stress were altered in unselected Marfan patients but not in the subgroup without dilation. In multivariate regression analysis proximal descending aorta axial (p = 0.014) and circumferential (p = 0.034) wall shear stress were independently related to local diameter. CONCLUSIONS Reduced rotational flow is present in the aorta of Marfan patients even in the absence of dilation, is related to aortic stiffness and drives abnormal circumferential wall shear stress. Axial and circumferential wall shear stress are independently related to proximal descending aorta dilation beyond clinical factors. In-plane rotational flow and circumferential wall shear stress may be considered as an early marker of descending aorta dilation in Marfan patients.
Collapse
Affiliation(s)
- A. Guala
- Hospital Universitari Vall d’Hebron, Department of Cardiology. CIBER-CV. Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Paseo Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - G. Teixido-Tura
- Hospital Universitari Vall d’Hebron, Department of Cardiology. CIBER-CV. Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Paseo Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - L. Dux-Santoy
- Hospital Universitari Vall d’Hebron, Department of Cardiology. CIBER-CV. Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Paseo Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - C. Granato
- Hospital Universitari Vall d’Hebron, Department of Cardiology. CIBER-CV. Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Paseo Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - A. Ruiz-Muñoz
- Hospital Universitari Vall d’Hebron, Department of Cardiology. CIBER-CV. Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Paseo Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - F. Valente
- Hospital Universitari Vall d’Hebron, Department of Cardiology. CIBER-CV. Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Paseo Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - L. Galian-Gay
- Hospital Universitari Vall d’Hebron, Department of Cardiology. CIBER-CV. Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Paseo Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - L. Gutiérrez
- Hospital Universitari Vall d’Hebron, Department of Cardiology. CIBER-CV. Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Paseo Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - T. González-Alujas
- Hospital Universitari Vall d’Hebron, Department of Cardiology. CIBER-CV. Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Paseo Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - K. M. Johnson
- Departments of Medical Physics & Radiology, University of Wisconsin – Madison, Madison, WI USA
| | - O. Wieben
- Departments of Medical Physics & Radiology, University of Wisconsin – Madison, Madison, WI USA
| | - A. Sao Avilés
- Hospital Universitari Vall d’Hebron, Department of Cardiology. CIBER-CV. Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Paseo Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - A. Evangelista
- Hospital Universitari Vall d’Hebron, Department of Cardiology. CIBER-CV. Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Paseo Vall d’Hebron 119-129, 08035 Barcelona, Spain
| | - J. Rodriguez-Palomares
- Hospital Universitari Vall d’Hebron, Department of Cardiology. CIBER-CV. Vall d’Hebron Institut de Recerca (VHIR), Universitat Autònoma de Barcelona, Paseo Vall d’Hebron 119-129, 08035 Barcelona, Spain
| |
Collapse
|
9
|
Del Sol-Fernández S, Portilla-Tundidor Y, Gutiérrez L, Odio OF, Reguera E, Barber DF, Morales MP. Flower-like Mn-Doped Magnetic Nanoparticles Functionalized with α vβ 3-Integrin-Ligand to Efficiently Induce Intracellular Heat after Alternating Magnetic Field Exposition, Triggering Glioma Cell Death. ACS Appl Mater Interfaces 2019; 11:26648-26663. [PMID: 31287950 DOI: 10.1021/acsami.9b08318] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Despite the potential of magnetic nanoparticles (NPs) to mediate intracellular hyperthermia when exposed to an alternating magnetic field (AMF), several studies indicate that the intracellular heating capacity of magnetic NPs depends on factors such as cytoplasm viscosity, nanoparticle aggregation within subcellular compartments, and dipolar interactions. In this work, we report the design and synthesis of monodispersed flowerlike superparamagnetic manganese iron oxide NPs with maximized SAR (specific absorption rate) and evaluate their efficacy as intracellular heaters in the human tumor-derived glioblastoma cell line U87MG. Three main strategies to tune the particle anisotropy of the core and the surface to reach the maximum heating efficiency were adopted: (1) varying the crystalline anisotropy by inserting a low amount of Mn2+ in the inverse spinel structure, (2) varying the NP shape to add an additional anisotropy source while keeping the superparamagnetic behavior, and (3) maximizing NP-cell affinity through conjugation with a biological targeting molecule to reach the NP concentration required to increase the temperature within the cell. We investigate possible effects produced by these improved NPs under the AMF (f = 96 kHz, H = 47 kA/m) exposure in the glioblastoma cell line U87MG by monitoring the expression of hsp70 gene and reactive oxygen species (ROS) production, as both effects have been described to be induced by increasing the intracellular temperature. The induced cell responses include cellular membrane permeabilization and rupture with concomitant high ROS appearance and hsp70 expression, followed by cell death. The responses were largely limited to cells that contained the NPs exposed to the AMF. Our results indicate that the developed strategies to optimize particle anisotropy in this work are a promising guidance to improve the heating efficiency of magnetic NPs in the human glioma cell line.
Collapse
Affiliation(s)
- S Del Sol-Fernández
- Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Legaria (CICATA-Legaria) , Calz Legaria 694, Col. Irrigación , 11500 Ciudad de México , Mexico
| | - Y Portilla-Tundidor
- Department of Immunology and Oncology and Nanobiomedicine Initiative , Centro Nacional de Biotecnología (CNB-CSIC) , Darwin 3 , 28049 Madrid , Spain
| | - L Gutiérrez
- Departamento de Química Analítica , Universidad de Zaragoza, Instituto de Nanociencia de Aragón, Instituto de Ciencia de Materiales de Aragón (ICMA-CSIC) and CIBER-BBN , 50009 Zaragoza , Spain
| | - O F Odio
- Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Legaria (CICATA-Legaria) , Calz Legaria 694, Col. Irrigación , 11500 Ciudad de México , Mexico
| | - E Reguera
- Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Unidad Legaria (CICATA-Legaria) , Calz Legaria 694, Col. Irrigación , 11500 Ciudad de México , Mexico
| | - D F Barber
- Department of Immunology and Oncology and Nanobiomedicine Initiative , Centro Nacional de Biotecnología (CNB-CSIC) , Darwin 3 , 28049 Madrid , Spain
| | - M P Morales
- Department of Energy, Environment and Health , Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC) , Sor Juana Ines de la Cruz 3 , 28049 Madrid , Spain
| |
Collapse
|
10
|
Ferri C, Weich N, Gutiérrez L, De Brasi C, Bengió M, Zapata P, Fundia A, Larripa I. Single nucleotide polymorphism in PTEN-Long gene: A risk factor in chronic myeloid leukemia. Gene 2019; 694:71-75. [DOI: 10.1016/j.gene.2019.01.038] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 01/05/2019] [Accepted: 01/22/2019] [Indexed: 02/01/2023]
|
11
|
Ruiz-Casado A, Gutiérrez L, Sánchez A, Manso M. Lengua geográfica inducida por inhibidores de la angiogénesis. Rev Clin Esp 2018; 218:501-502. [DOI: 10.1016/j.rce.2018.07.008] [Citation(s) in RCA: 1] [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] [Received: 07/10/2018] [Revised: 07/18/2018] [Accepted: 07/23/2018] [Indexed: 10/28/2022]
|
12
|
Ledesma C, Rosario C, Gracia-Mora J, Tapia G, Gutiérrez L, Sumano H. Antibacterial activity of amoxicillin in vitro and its oral bioavailability in broiler chickens under the influence of 3 water sanitizers. Poult Sci 2018; 97:2391-2399. [PMID: 29897502 DOI: 10.3382/ps/pey114] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 03/12/2018] [Indexed: 11/20/2022] Open
Abstract
The interaction of 3 water sanitizers (sodium hypochlorite, iodine-polyvinylpyrrolidone, and citrate) utilized in poultry production on antibacterial activity and bioavailability of amoxicillin trihydrate (AMX) were studied. Sanitizers were mixed with AMX in prepared water, the resulting substances were regarded as amoxicillin-sanitizer products (ASP). First, the in vitro antibacterial activity of each ASP was compared to that of AMX. Then, pharmacokinetics (PK) of ASP and AMX diluted in prepared water, were carried out in broiler-chickens. Amoxicillin or ASP (20 mg/kg) from different concentrations of sanitizers was directly placed into the chicken's crop and blood samples were taken. Basic PK parameters were obtained. Serum activity/concentrations of AMX were assessed by agar diffusion and corroborated with high performance liquid chromatography. Results show that ASP of AMX/sodium hypochlorite decrease both, the antimicrobial activity of in vitro AMX and its relative bioavailability (Fr) assessed with the maximum serum concentration (Cmax), the area under the concentration-time curve, and the mean residence time (MRT) (3.80 μg/mL, 2.70 μg/mL·h, and 0.59 h, respectively), compared to the AMX administered alone (12.54 μg/mL, 44.02 μg/mL·h, and MRT 2.78 h). ASP from amoxicillin/ionophore, reduced the Cmax (10.62 μg/mL), Fr (94.67%), and MRT (2.07 h), at the highest tested concentrations. In contrast, the 2 highest concentrations of the citrate sanitizer increased the Cmax (15.07 and 15.47 μg/mL), Fr (119 and 132%), and MRT (3.32 and 4.06 h) and their in vitro antimicrobial activity. Interactions between the tested water sanitizers and AMX modify the Cmax, Fr, MRT of the latter, altering the PK/pharmacodymanic ratios for a time-dependent antibiotic. Results also reveal that the use of amoxicillin trihydrate administered through the drinking water does not meet the required PK/pharmacodymanic ratios. Thus, it is here postulated that this antibiotic should be administered at least twice a day and that its interaction with water sanitizers should be considered.
Collapse
Affiliation(s)
- C Ledesma
- Department of Physiology and Pharmacology, School of Veterinary Medicine, National Autonomous University of Mexico, Av. Universidad 3000, Coyoacán, Mexico City 04510, Mexico
| | - C Rosario
- Department of Avian Medicine, School of Veterinary Medicine, National Autonomous University of Mexico, Av. Universidad 3000, Coyoacán, Mexico City 04510, Mexico
| | - J Gracia-Mora
- Department Nuclear and Inorganic Chemistry, School of Chemistry, National Autonomous University of Mexico, Av. Universidad 3000, Coyoacán, Mexico City 04510, Mexico
| | - G Tapia
- Department of Genetic and Biostatistics, School of Veterinary Medicine, National Autonomous University of Mexico, Av. Universidad 3000, Coyoacán, Mexico City 04510, Mexico
| | - L Gutiérrez
- Department of Physiology and Pharmacology, School of Veterinary Medicine, National Autonomous University of Mexico, Av. Universidad 3000, Coyoacán, Mexico City 04510, Mexico
| | - H Sumano
- Department of Physiology and Pharmacology, School of Veterinary Medicine, National Autonomous University of Mexico, Av. Universidad 3000, Coyoacán, Mexico City 04510, Mexico
| |
Collapse
|
13
|
Ledesma C, Rosario C, Gracia-Mora J, Tapia G, Sumano H, Gutiérrez L. Influence of chlorine, iodine, and citrate-based water sanitizers on the oral bioavailability of enrofloxacin in broiler chickens. J APPL POULTRY RES 2018. [DOI: 10.3382/japr/pfx044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
14
|
Marín-Barba M, Gavilán H, Gutiérrez L, Lozano-Velasco E, Rodríguez-Ramiro I, Wheeler GN, Morris CJ, Morales MP, Ruiz A. Unravelling the mechanisms that determine the uptake and metabolism of magnetic single and multicore nanoparticles in a Xenopus laevis model. Nanoscale 2018; 10:690-704. [PMID: 29242877 DOI: 10.1039/c7nr06020c] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Multicore superparamagnetic nanoparticles have been proposed as ideal tools for some biomedical applications because of their high magnetic moment per particle, high specific surface area and long term colloidal stability. Through controlled aggregation and packing of magnetic cores it is possible to obtain not only single-core but also multicore and hollow spheres with internal voids. In this work, we compare toxicological properties of single and multicore nanoparticles. Both types of particles showed moderate in vitro toxicity (MTT assay) tested in Hep G2 (human hepatocellular carcinoma) and Caco-2 (human colorectal adenocarcinoma) cells. The influence of surface chemistry in their biological behavior was also studied after functionalization with O,O'-bis(2-aminoethyl) PEG (2000 Da). For the first time, these nanoparticles were evaluated in a Xenopus laevis model studying their whole organism toxicity and their impact upon iron metabolism. The degree of activation of the metabolic pathway depends on the size and surface charge of the nanoparticles which determine their uptake. The results also highlight the potential of Xenopus laevis model bridging the gap between in vitro cell-based assays and rodent models for toxicity assessment to develop effective nanoparticles for biomedical applications.
Collapse
Affiliation(s)
- M Marín-Barba
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, Norfolk NR4 7TJ, UK
| | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Otero JA, Monsivais G, Morales A, Gutiérrez L, Díaz-de-Anda A, Flores J. Further understanding of doorway states in elastic systems. J Acoust Soc Am 2017; 142:646. [PMID: 28863612 DOI: 10.1121/1.4996500] [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: 06/07/2023]
Abstract
In a previous work an elastic bar with a groove or notch that presents a doorway state was studied when the system was excited with 20 cycles of harmonic signals. The strength function had a Lorentzian width Γd = 1/πτd, where τd is the decay time of the prompt response. In the present paper, the doorway-state phenomenon is analyzed again for the same harmonic signals but for a very large number of cycles. The strength-function phenomenon is once more obtained, but now with a Lorentzian width Γ' which is larger than Γd. A qualitative and numerical explanation of this fact is given, leading therefore to further understanding of doorway states in elastic systems. The numerical results show a very good agreement with the values measured in the laboratory.
Collapse
Affiliation(s)
- J A Otero
- Tecnológico de Monterrey, Campus Estado de México, Atizapán de Zaragoza, 52926 Estado de México, Mexico
| | - G Monsivais
- Instituto de Física, Universidad Nacional Autónoma de México, P.O. Box 20-364, 01000 Ciudad de México, Mexico
| | - A Morales
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, P.O. Box 48-3, 62251 Cuernavaca, Morelos, Mexico
| | - L Gutiérrez
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, P.O. Box 48-3, 62251 Cuernavaca, Morelos, Mexico
| | - A Díaz-de-Anda
- Instituto de Física, Benemérita Universidad Autónoma de Puebla, P.O. Box J-48, 72570 Puebla, Puebla, Mexico
| | - J Flores
- Instituto de Física, Universidad Nacional Autónoma de México, P.O. Box 20-364, 01000 Ciudad de México, Mexico
| |
Collapse
|
16
|
Gutiérrez L, Zermeño J, Alcalá Y, Sumano H. Higher bioavailability of doxycycline in broiler chickens with a novel in-feed pharmaceutical formulation. Poult Sci 2017; 96:2662-2669. [PMID: 28339766 DOI: 10.3382/ps/pex036] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Accepted: 01/18/2017] [Indexed: 11/20/2022] Open
Abstract
Bioavailability of a new, long-acting (LA) pharmaceutical preparation for administering doxycycline as in-feed medication to broiler chickens was compared to the standard in-feed administration of doxycycline. A commercial poultry house harboring Ross-308 broiler chickens, weighing 450 g, was divided into 7 sections as follows: doxy-FOLA group (n = 6,000 chickens divided into 3 replicates) medicated with 10% doxycyline, long-acting pellets at a dose of 400 g of doxycycline HCl/ton of food, resulting in a calculated dose of 48 mg/kg for 5 d; doxy-ref group (n = 6,000, divided into 3 replicates) medicated as for doxy-FOLA, but using a 20% commercial preparation of doxycycline. A third group of 300 broiler chickens (divided into 3 replicates), received a single IV dose of 48 mg/kg from a 2.4% solution of doxycycline HCl under ketamine anesthesia. Blood samples were obtained at designated times, serum was harvested, and doxycycline concentrations determined by high-performance liquid chromatography (HPLC). Bioavailability values were 156% and 227% on d 1 and 5 for doxy-FOLA and 13% and 23% for doxy-ref, on the same days. Mean residence time (MRT) and elimination half-life (T½β) were statistically different (P < 0.05) in doxy-FOLA group as compared to doxy-ref group (MRT: 26 h and 5.2 h; and T½β: 18 h vs 3 h, on the first day for doxy-FOLA and doxy-ref, respectively). Based on 3 levels of bacterial sensitivity of E. coli derived from a small survey carried out (i.e., 1.0, 2.0, and 4.0 μg/mL) and considering pharmacokinetic/pharmacodynamic (PK/PD) ratios required for this time-dependent antibacterial drug, it is possible to postulate that doxy-FOLA outstrips the reference preparation maintaining higher and more prolonged serum concentrations of doxycycline and consequently complying better with PK/PD ratios regarded as optimal for this drug. The advantages of using doxy-FOLA in poultry medicine include a more comprehensive use of the active principle, which in turn should have a better impact on bacterial diseases. Yet, a longer withdrawal time is anticipated based on an almost 4-fold increment in the MRT value.
Collapse
Affiliation(s)
- Lilia Gutiérrez
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia. Universidad Nacional Autónoma de México, Av. Universidad 3000, Delegación Coyoacán, Ciudad de México C.P. 04510, México
| | - Juan Zermeño
- NF Feed Products Mexico S.A. de C.V. de la Industria 20, Fraccionamiento Industrial La Luz, Cuautitlán, México, C.P. 54830, México
| | - Yazmín Alcalá
- Departamento de Parasitología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Av. Universidad 3000, Delegación Coyoacán, Ciudad de México C.P. 04510, México
| | - Héctor Sumano
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia. Universidad Nacional Autónoma de México, Av. Universidad 3000, Delegación Coyoacán, Ciudad de México C.P. 04510, México
| |
Collapse
|
17
|
Viveros M, Lopez-Ordaz R, Gutiérrez L, Miranda-Calderón JE, Sumano H. Efficacy assessment of an intramammary treatment with a new recrystallized enrofloxacin vs ceftiofur and parenteral enrofloxacin in dairy cows with nonsevere clinical mastitis. J Vet Pharmacol Ther 2017; 41:e1-e9. [PMID: 28752931 DOI: 10.1111/jvp.12441] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 06/21/2017] [Indexed: 11/28/2022]
Abstract
A recrystallized form of enrofloxacin as dehydrate-HCl (enro-C) was assessed for bacteriological and clinical cure efficacies in Holstein-Friesian cows affected of nonsevere clinical mastitis. Treatments were enro-Csusp (n = 81), treated with a pharmaceutical suspension of enro-C/quarter; group enro-Cpd (n = 80) treated as above, but using enro-C powder suspended in water; group CF (n = 65), treated with ceftiofur HCl/quarter; and group enroR (n = 66), treated with standard enrofloxacin solution (5 mg/kg, intramuscular). Cows had a mean milk production of 31 L/day and were 2-3 lactational periods old. Treatments were administered every 24 hr for 3 days. Groups treated with enro-C exhibited statistically significant (p > .05) better clinical cure as compared to groups treated with CF or enroR (95.06%, 96.25%, 67.79%, and 57.55%, for enro-Csusp , enro-Cpd , CF, and enroR , respectively). In contrast, probability of bacteriological cure was not statistically different among treatments. Yet, the outstanding clinical and bacteriological cure rates obtained for enro-C for nonsevere cases of mastitis is superior to previously reported data for parenteral enrofloxacin and other antibacterial-intramammary treatments. Impact of using enro-C on the rate and pattern of bacterial resistance, somatic cell counts and milk electric conductivity, must be studied. Also, the use of enro-C for complicated cases of mastitis should be studied and milk withdrawal times must be accurately established.
Collapse
Affiliation(s)
- M Viveros
- Department of Physiology and Pharmacology, National Autonomous University of Mexico (UNAM), Mexico City, Mexico
| | - R Lopez-Ordaz
- Department of Agricultural and Animal Production, Autonomous Metropolitan University, Mexico City, Mexico
| | - L Gutiérrez
- Department of Physiology and Pharmacology, National Autonomous University of Mexico (UNAM), Mexico City, Mexico
| | - J E Miranda-Calderón
- Unidad Xochimilco Calzada del Hueso 1100, Departamento de Sistemas Biológicos, Universidad Autónoma Metropolitana, Coyoacán, Ciudad de México, México
| | - H Sumano
- Department of Physiology and Pharmacology, National Autonomous University of Mexico (UNAM), Mexico City, Mexico
| |
Collapse
|
18
|
Salas C, Gutiérrez L, Garduño S, Macias M, Ingunza L, Villanego I, Díaz V, Gonzalez E, Díaz L, Ureña A, Quiñones L, Jaén J. EP-1312: Long terms outcome in prostate cancer with image guided and intensity modulated radiation therapy. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31747-4] [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: 12/01/2022]
|
19
|
Mendoza J, Martínez-Cortés I, López-Ordaz R, Gutiérrez L, Sumano H. Concentrations of tilmicosin in mammary gland secretions of dairy cows following subcutaneous administration of one or two doses of an experimental preparation of tilmicosin and its efficacy against intramammary infections caused by Staphylococcus aureus. Am J Vet Res 2017; 77:922-30. [PMID: 27580103 DOI: 10.2460/ajvr.77.9.922] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine the concentration of tilmicosin in mammary gland secretions of dairy cows following administration of an experimental preparation once or twice during the dry period (45-day period immediately prior to calving during which cows are not milked) and to evaluate its efficacy for the treatment of cows with intramammary infections (IMIs) caused by Staphylococcus aureus at dry off (cessation of milking; first day of dry period), compared with that of an intramammary infusion of ceftiofur. ANIMALS 172 cows. PROCEDURES Milk samples were collected for microbiological culture 5 days before dry off and at calving and 15 and 30 days after calving. Cows with Staphylococcus IMIs were randomly assigned to receive an experimental preparation of tilmicosin (20 mg/kg, SC) once at dry off (n = 58) or at dry off and again 20 days later (56) or receive a long-acting intramammary preparation of ceftiofur (500 mg/mammary gland; 56) at dry off. Mammary gland secretions were collected from 5 cows in the tilmicosin-treated groups every 5 days after dry off until calving for determination of tilmicosin concentration. RESULTS Mean maximum concentration of tilmicosin in mammary gland secretions ranged from 14.4 to 20.9 μg/mL after the first dose and was 17.1 μg/mL after the second dose. The bacteriologic cure rate was 100% for all 3 treatments. Tilmicosin was detectable for 0 and 18 days after calving in the milk of cows treated with 1 and 2 doses of tilmicosin, respectively. CONCLUSIONS AND CLINICAL RELEVANCE Administration of an experimental preparation of tilmicosin (20 mg/kg, SC) once to dairy cows at dry off might be useful for the treatment of S aureus IMIs.
Collapse
|
20
|
Carrillo L, Sumano H, Medina-Torres L, Tapia G, Gutiérrez L. Rheological study of healthy chicken's pooled tracheobronchial secretions and its modification by mucolytics drugs. Poult Sci 2016; 95:2667-2672. [PMID: 27418656 DOI: 10.3382/ps/pew209] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/13/2016] [Indexed: 11/20/2022] Open
Abstract
The rheological properties of pooled tracheobronchial secretions (TBS) of chicken, including mucus, have not been characterized. Yet mucolytic drugs are frequently used in poultry medicine. To define such properties, TBS from healthy untreated and from chickens treated with various mucolytic drugs was studied. Three hundred, three-week-old Rhode Island Red chickens were divided into five groups, with three repetitions each (n = 20) as follows: ambroxol (GAmb), ethylene diamine dihydro-iodide (GEddi), carbocysteine (GCs), bromhexine (GBr), and an untreated control group (CG). Under anesthesia, samples of TBS were taken by gently flushing saline solution through the tracheobronchial tree, and rheological evaluations were made to determine viscosity, yield stress, and viscoelasticity by means of a rheometer using controlled efforts with a geometry system of concentric cylinders. It was found that TBS in the CG and in all treatments showed a non-Newtonian behavior (n < 1). TBS from all treatments possess yield stress (necessary force applied for a fluid to flow) and a pseudo-solid type behavior (viscoelastic test) as far as elasticity is concerned. TBS from treated animals revealed that yield stress was higher for the GBr and lowest for GAmb. Statistically significant differences in viscosity were observed among all treatments, including CG (P < 0.05). Considering yield stress, little effort would be required for respiratory cilia to displace TBS in ambroxol medicated chickens, followed by carbocysteine. Contrary to expectation, cilia from healthy chickens medicated with bromhexine or ethylene diamine dihydro-iodide, would require greater force to displace mucus as compared to untreated healthy birds.
Collapse
Affiliation(s)
- Lizbeth Carrillo
- Departamento de Fisiología y Farmacología., Facultad de Medicina Veterinaria y Zootecnia., Universidad Nacional Autónoma de México., Av. Universidad 3000, Delegación Coyoacán, 04360., México
| | - Héctor Sumano
- Departamento de Fisiología y Farmacología., Facultad de Medicina Veterinaria y Zootecnia., Universidad Nacional Autónoma de México., Av. Universidad 3000, Delegación Coyoacán, 04360., México
| | - Luis Medina-Torres
- Facultad de Química., Universidad Nacional Autónoma de México., Av. Universidad 3000, Delegación Coyoacán, 04360., México
| | - Graciela Tapia
- Departamento de Genética y Bioestadística, Facultad de Medicina Veterinaria y Zootecnia., Universidad Nacional Autónoma de México., Av. Universidad 3000, Coyoacán, México City 04510, México
| | - Lilia Gutiérrez
- Departamento de Fisiología y Farmacología., Facultad de Medicina Veterinaria y Zootecnia., Universidad Nacional Autónoma de México., Av. Universidad 3000, Delegación Coyoacán, 04360., México
| |
Collapse
|
21
|
Valenzuela A, Gutiérrez L, Camarena B, Silveira I, García J, Meza M, Aldana L, Bermúdez C, Grajeda P, Robles R, Leal S, Ochoa B, Mariscal D. Levels of organochlorine pesticides in soils of the major agricultural zones in Sonora, Mexico and the implementation of a communication strategy for the risk exposure prevention. Toxicol Lett 2016. [DOI: 10.1016/j.toxlet.2016.07.537] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
22
|
Aquino I, Alcalá Y, Gutiérrez L, Tapia G, Jung H, Sumano H. In vivo anticoccidial activity of quinfamide in broilers: a preliminary report. Italian Journal of Animal Science 2016. [DOI: 10.1080/1828051x.2016.1229585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
23
|
Ortega E, Gutiérrez L, Bernad M, Salmerón F, Juárez I, Vargas D. Evaluation of Different Oral Formulations of Clindamycin Extended Release in Dogs. Drug Res (Stuttg) 2016; 67:32-37. [DOI: 10.1055/s-0042-115637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- E. Ortega
- Department of Physiology and Pharmacology, Facultad de Medicina Veterinaria y Zootecnia of the Universidad Nacional Autónoma de México, Delegación Coyoacán, Ciudad de México C.P. México
| | - L. Gutiérrez
- Department of Physiology and Pharmacology, Facultad de Medicina Veterinaria y Zootecnia of the Universidad Nacional Autónoma de México, Delegación Coyoacán, Ciudad de México C.P. México
| | - M. Bernad
- Department of Pharmaceutical Technology, Facultad de Química of the Universidad Nacional Autónoma de México, Delegación Coyoacán, Ciudad de México C.P., México
| | - F. Salmerón
- Department of Genetics and Biostatistics, Facultad de Medicina Veterinaria y Zootecnia of the Universidad Nacional Autónoma de México, Delegación Coyoacán, Ciudad de México C.P., México
| | - I. Juárez
- Department of Physiology and Pharmacology, Facultad de Medicina Veterinaria y Zootecnia of the Universidad Nacional Autónoma de México, Delegación Coyoacán, Ciudad de México C.P. México
| | - D. Vargas
- Department of Physiology and Pharmacology, Facultad de Medicina Veterinaria y Zootecnia of the Universidad Nacional Autónoma de México, Delegación Coyoacán, Ciudad de México C.P. México
| |
Collapse
|
24
|
Ruiz A, Gutiérrez L, Cáceres-Vélez PR, Santos D, Chaves SB, Fascineli ML, Garcia MP, Azevedo RB, Morales MP. Biotransformation of magnetic nanoparticles as a function of coating in a rat model. Nanoscale 2015; 7:16321-9. [PMID: 26381991 DOI: 10.1039/c5nr03780h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Long-term in vivo studies in murine models have shown that DMSA-coated nanoparticles accumulate in spleen, liver and lung tissues during extended periods of time (at least up to 3 months) without any significant signs of toxicity detected. During that time, nanoparticles undergo a process of biotransformation either by reducing the size or the particle aggregation or both. Using a rat model, we have evaluated the transformations of magnetic nanoparticles injected at low doses. Particles with two different coatings, dimercaptosuccinic acid (NP-DMSA) and polyethylene glycol (NP-PEG-(NH2)2) have been administered to animals, to evaluate the role of coating in the degradation of the particles. We have found that low doses of magnetic nanoparticles are quickly metabolized by the animals. In fact, using a nanoparticle dose four times lower than in previous experiments, NP-DMSA were not observed 24 h after the administration either in the liver or in the lungs. Interestingly, an increased amount of ferritin, the iron storage protein, was observed in liver tissues from rats that were treated with the low dose of NP-DMSA in comparison with the control ones, suggesting a rapid metabolization of the particles into ferritin iron. On the other side we have found that, NP-PEG-(NH2)2 are still detectable in several organs 24 h after their administration at low doses. Probably, due to the longer circulation times of the NP-PEG-(NH2)2, there is a delay in the arrival of the particles to the tissue and this is the reason why we are able to see the particles 24 h post-administration. PEG coating could also be protecting the nanoparticles from rapid degradation of the reticuloendothelial system. Knowledge on the biodistribution, circulation time and degradation processes is required to gain a better understanding of the safety evaluation of this kind of nanomaterial for biomedical applications.
Collapse
Affiliation(s)
- A Ruiz
- Instituto de Ciencia de Materiales de Madrid (ICMM)/CSIC, Sor Juana Inés de la Cruz 3, Cantoblanco, 28049 Madrid, Spain.
| | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Merino JL, Gutiérrez L, Caniego JL, Paraíso V. Renal Function Recovery After Revascularization with Percutaneous Angioplasty of a Patient on Chronic Hemodialysis. Cardiovasc Intervent Radiol 2015; 38:1339-42. [PMID: 25975743 DOI: 10.1007/s00270-015-1121-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2015] [Accepted: 04/19/2015] [Indexed: 11/24/2022]
Affiliation(s)
- Jose L Merino
- Section of Nephrology, Hospital Universitario del Henares, Avenue Marie Curie S/N. 28822, Coslada, Madrid, Spain.
| | - L Gutiérrez
- Department of Radiology, Hospital Universitario del Henares, Coslada, Madrid, Spain.
| | - J L Caniego
- Department of Radiology, Hospital Universitario La Princesa, Madrid, Spain.
| | - V Paraíso
- Section of Nephrology, Hospital Universitario del Henares, Avenue Marie Curie S/N. 28822, Coslada, Madrid, Spain.
| |
Collapse
|
26
|
Alcalá Y, Rivero F, Sumano H, Gutiérrez L. Acaricidal Action of Water Extracts fromEysenhardtia polystachyaAgainstRhipicephalus(Boophilus)microplus. COMP PARASITOL 2015. [DOI: 10.1654/4710.1] [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: 11/11/2022]
|
27
|
Gutiérrez L, Costo R, Grüttner C, Westphal F, Gehrke N, Heinke D, Fornara A, Pankhurst QA, Johansson C, Veintemillas-Verdaguer S, Morales MP. Synthesis methods to prepare single- and multi-core iron oxide nanoparticles for biomedical applications. Dalton Trans 2015; 44:2943-52. [DOI: 10.1039/c4dt03013c] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We review and classify synthetic routes to either single-core or multi-core iron oxide nanoparticles for biomedical applications.
Collapse
Affiliation(s)
- L. Gutiérrez
- Instituto de Ciencia de Materiales de Madrid
- ICMM-CSIC
- Cantoblanco
- Spain
| | - R. Costo
- Instituto de Ciencia de Materiales de Madrid
- ICMM-CSIC
- Cantoblanco
- Spain
| | - C. Grüttner
- Micromod Partikeltechnologie GmbH
- D-18119 Rostock
- Germany
| | - F. Westphal
- Micromod Partikeltechnologie GmbH
- D-18119 Rostock
- Germany
| | - N. Gehrke
- NanoPET Pharma GmbH
- D-10115 Berlin
- Germany
| | - D. Heinke
- NanoPET Pharma GmbH
- D-10115 Berlin
- Germany
| | - A. Fornara
- SP Technical Research Institute of Sweden
- SE-114 86 Stockholm
- Sweden
| | - Q. A. Pankhurst
- Institute of Biomedical Engineering
- University College of London
- London WC1E 6BT
- UK
| | - C. Johansson
- Acreo Swedish ICT AB
- Arvid Hedvalls Backe 4
- SE-400 14 Göteborg
- Sweden
| | | | - M. P. Morales
- Instituto de Ciencia de Materiales de Madrid
- ICMM-CSIC
- Cantoblanco
- Spain
| |
Collapse
|
28
|
Miranda-Calderón JE, Gutiérrez L, Flores-Alamo M, García-Gutiérrez P, Sumano H. Enrofloxacin hydro-chloride dihydrate. Acta Crystallogr Sect E Struct Rep Online 2014; 70:o468-9. [PMID: 24826167 PMCID: PMC3998605 DOI: 10.1107/s1600536814006059] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Accepted: 03/18/2014] [Indexed: 11/15/2022]
Abstract
The asymmetric unit of the title compound, C19H23FN3O3+·Cl−·2H2O [systematic name: 4-(3-carboxy-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydroquinolin-7-yl)-1-ethylpiperazin-1-ium chloride dihydrate], consists of two independent monocations of the protonated enrofloxacin, two chloride anions and four water molecules. In the cations, the piperazinium rings adopt chair conformations and the dihedral angles between the cyclopropyl ring and the 10-membered quinoline ring system are 56.55 (2) and 51.11 (2)°. An intramolecular O—H⋯O hydrogen bond is observed in each cation. In the crystal, the components are connected via O—H⋯Cl, N—H⋯Cl and O—H⋯O hydrogen bonds, and a π–π interaction between the benzene rings [centroid–centroid distance = 3.6726 (13) Å], resulting in a three-dimensional array.
Collapse
Affiliation(s)
- Jorge E Miranda-Calderón
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Av. Universidad 3000, Delegación Coyoacán, Ciudad de México, CP 04510, Mexico
| | - Lilia Gutiérrez
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Av. Universidad 3000, Delegación Coyoacán, Ciudad de México, CP 04510, Mexico
| | - Marcos Flores-Alamo
- Facultad de Química, Universidad Nacional Autónoma de México, 04510 México D.F., Mexico
| | - Ponciano García-Gutiérrez
- Laboratorio Divisional de Espectroscopia de Masas, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco 186, Delegación Iztapalapa, Ciudad de México, CP 09340, Mexico
| | - Héctor Sumano
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Av. Universidad 3000, Delegación Coyoacán, Ciudad de México, CP 04510, Mexico
| |
Collapse
|
29
|
Gutiérrez L, Morales MP, Lázaro FJ. Prospects for magnetic nanoparticles in systemic administration: synthesis and quantitative detection. Phys Chem Chem Phys 2014; 16:4456-64. [DOI: 10.1039/c3cp54763a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Methods for the quantitative determination of magnetic nanoparticles in biological matrices, in the frame of biomedical applications, are required to evaluate the particles biodistribution after systemic administration.
Collapse
Affiliation(s)
- L. Gutiérrez
- Department of Biomaterials and Bioinspired Materials
- Instituto de Ciencia de Materiales de Madrid (ICMM)/CSIC
- Cantoblanco, Spain
| | - M. P. Morales
- Department of Biomaterials and Bioinspired Materials
- Instituto de Ciencia de Materiales de Madrid (ICMM)/CSIC
- Cantoblanco, Spain
| | - F. J. Lázaro
- Department of Materials and Fluids Science and Technology
- Universidad de Zaragoza
- 50018 Zaragoza, Spain
| |
Collapse
|
30
|
Salas C, Gutiérrez L, De Ingunza L, González E, Díaz L, Villanego I, Díaz V, Jaén J. PO-0738: Imagen guided radiotherapy in prostate cancer: Interobservator variability with CBCT Mv and fiducial markers. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)30856-2] [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: 10/23/2022]
|
31
|
Díaz-de-Anda A, Flores J, Gutiérrez L, Méndez-Sánchez RA, Monsivais G, Morales A. Emergence of acoustic and optical bands in elastic systems. J Acoust Soc Am 2013; 134:4393. [PMID: 25669250 DOI: 10.1121/1.4828822] [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: 06/04/2023]
Abstract
Two elastic systems are considered in this work: A special linear chain of harmonic oscillators and a quasi one-dimensional vibrating rod. Starting in both cases with a locally periodic system formed by unit cells with a single element, these cells are converted into binary cells. The acoustic and optical bands then appear. For the vibrating rod experimental values are compared with theoretical results; in particular, the normal-mode amplitudes are obtained and the agreement is excellent.
Collapse
Affiliation(s)
- A Díaz-de-Anda
- Instituto de Física, Universidad Nacional Autónoma de México, P.O. Box 20-364, 01000 México, Distrito Federal, Mexico
| | - J Flores
- Instituto de Física, Universidad Nacional Autónoma de México, P.O. Box 20-364, 01000 México, Distrito Federal, Mexico
| | - L Gutiérrez
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, P.O. Box 48-3, 62251 Cuernavaca, Mor., Mexico
| | - R A Méndez-Sánchez
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, P.O. Box 48-3, 62251 Cuernavaca, Mor., Mexico
| | - G Monsivais
- Instituto de Física, Universidad Nacional Autónoma de México, P.O. Box 20-364, 01000 México, Distrito Federal, Mexico
| | - A Morales
- Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, P.O. Box 48-3, 62251 Cuernavaca, Mor., Mexico
| |
Collapse
|
32
|
Durán I, Garzón C, Sánchez A, García-Carbonero I, Pérez-Gracia JL, Seguí-Palmer MÁ, Wei R, Restovic G, Gasquet JA, Gutiérrez L. Cost analysis of skeletal-related events in Spanish patients with bone metastases from solid tumours. Clin Transl Oncol 2013; 16:322-9. [PMID: 23943561 PMCID: PMC3924023 DOI: 10.1007/s12094-013-1077-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Accepted: 07/02/2013] [Indexed: 10/29/2022]
Abstract
PURPOSE To estimate the cost per skeletal-related event (SRE) in patients with bone metastases secondary to solid tumours in the Spanish healthcare setting. METHODS Patients diagnosed with bone metastases secondary to breast, prostate or lung cancer were included in this multicentre, observational study. SREs are defined as pathologic fracture (vertebral and non-vertebral fracture), radiation to bone, spinal cord compression or surgery to bone. Health resource utilisation associated with these events (inpatient stays, outpatient, emergency room and home health visits, nursing home stays and procedures) were collected retrospectively for all SREs that occurred in the 97 days prior to enrolment and prospectively during follow-up. Unit costs were obtained from the 2010 eSalud healthcare costs database. RESULTS A total of 93 Spanish patients with solid tumours were included (31 had breast cancer, 21 prostate cancer and 41 lung cancer), contributing a total of 143 SREs to this cost analysis. Inpatient stays (between 9.0 and 29.9 days of mean length of stay per inpatient stay by SRE type) and outpatient visits (between 1.7 and 6.4 mean visits per SRE type) were the most frequently reported types of health resources utilised. The mean cost per SRE was between <euro>2,377.79 (radiation to bone) and <euro>7,902.62 (spinal cord compression). CONCLUSION SREs are associated with a significant consumption of healthcare resources that generate a substantial economic burden for the Spanish healthcare system.
Collapse
Affiliation(s)
- I Durán
- Centro Integral Oncológico Clara Campal (CIOCC), Madrid, Spain,
| | | | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Gutiérrez L, Ocampo L, Espinosa F, Sumano H. Pharmacokinetics of an injectable long-acting parenteral formulation of doxycycline hyclate in pigs. J Vet Pharmacol Ther 2013; 37:83-9. [PMID: 23866042 DOI: 10.1111/jvp.12066] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Accepted: 06/20/2013] [Indexed: 01/18/2023]
Abstract
Based on its ideal PK/PD ratios, doxycycline hyclate (DOX-h), a time-dependant antibacterial, is ideally expected to achieve sustained plasma drug concentrations at or slightly above the MIC level for as long as possible between dosing intervals. Pursuing this end, a poloxamer-based matrix was used to produce a 10% long-acting injectable preparation (DOX-h-LA) and its serum concentrations vs. time profile investigated after its injection to pigs in the pericaudal s.c. by parallel design. Results were compared with the forced oral bolus dose and i.v. pharmacokinetics of DOX-h. For this study, 12 recently weaned pigs per group were included in this trial, and a dose of 20 mg/kg was injected in all cases. DOX-h-LA showed the greatest values for bioavailability (115.38%); maximum serum concentration (Cmax) value was 1.5 ± 0.2 with a time to reach Cmax of 3.41 ± 0.04 h and an elimination rate constant of 70.93 ± 0.87( ) h. Considering minimum effective serum concentration of 0.5 μg/mL, a dose interval of at least 5 days can be achieved for DOX-h-LA, whereas p.o. and i.v. dosing of DOX-h may only last 11 and 15 h, respectively. Pigs were slaughtered on day 30 after this trial, and no visible remnants of the preparation were detected neither fibrosis was observed after a thorough macroscopic and histopathological analysis.
Collapse
Affiliation(s)
- L Gutiérrez
- Department of Physiology and Pharmacology, Faculty of Veterinary Medicine, National Autonomous University of Mexico, Coyoacan, Mexico
| | | | | | | |
Collapse
|
34
|
Martínez-Abraín A, Crespo J, Berdugo M, Gutiérrez L, Lafuente A, Mañas A, de Miguel JM. Causes of human impact to protected vertebrate wildlife parallel long-term socio-economical changes in Spain. Anim Conserv 2012. [DOI: 10.1111/j.1469-1795.2012.00599.x] [Citation(s) in RCA: 11] [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: 11/29/2022]
Affiliation(s)
| | - J. Crespo
- Centro de Recuperación de Fauna ‘La Granja’; Conselleria de Infraestructuras, Territorio y Medio Ambiente; Valencia; Spain
| | - M. Berdugo
- Departamento de Ecología; Facultad de Biología; Universidad Complutense de Madrid; Madrid; Spain
| | - L. Gutiérrez
- Departamento de Ecología; Facultad de Biología; Universidad Complutense de Madrid; Madrid; Spain
| | - A. Lafuente
- Departamento de Ecología; Facultad de Biología; Universidad Complutense de Madrid; Madrid; Spain
| | - A. Mañas
- Departamento de Ecología; Facultad de Biología; Universidad Complutense de Madrid; Madrid; Spain
| | - J. M. de Miguel
- Departamento de Ecología; Facultad de Biología; Universidad Complutense de Madrid; Madrid; Spain
| |
Collapse
|
35
|
Gutiérrez L, Velasco ZH, Vázquez C, Vargas D, Sumano H. Pharmacokinetics of an injectable long-acting formulation of doxycycline hyclate in dogs. Acta Vet Scand 2012; 54:35. [PMID: 22682068 PMCID: PMC3533740 DOI: 10.1186/1751-0147-54-35] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 06/08/2012] [Indexed: 12/03/2022] Open
Abstract
Based on its PK/PD ratios, doxycycline hyclate (DOX-h), a time-dependant antibacterial, is ideally expected to achieve both sustained plasma drug concentrations at or slightly above the MIC level for as long as possible between dosing intervals. Pursuing this end, a poloxamer-based matrix was used to produce a long-acting injectable preparation (DOX-h-LA) and its serum concentrations vs. time profile investigated after its SC injection to dogs (≤ 0.3 mL per injection site), and results compared with the oral (PO) and IV pharmacokinetics of DOX-h, prepared as tablet or as freshly made solution. A crossover (4 x 4 x 4) study design was employed with 12 Mongrel dogs, with washout periods of 21 days, and at dose of 10 mg/kg in all cases. DOX-h-LA showed the greatest values for bioavailability (199.48%); maximum serum concentration (Cmax) value was 2.8 ± 0.3 with a time to reach Cmax (Tmax) of 2.11 ± 0.12 h and an elimination half-life of 133.61 ± 6.32 h. Considering minimum effective serum concentration of 0.5 μg/mL, a dose-interval of at least 1 week h can be achieved for DOX-h-LA, and only 48 h and 24 h after the IV or PO administration of DOX-h as a solution or as tablets, respectively. A non-painful small bulge, apparently non-inflammatory could be distinguished at injection sites. These lumps dissipated completely in 30 days in all cases.
Collapse
|
36
|
Gutiérrez L, Vargas-Estrada D, Rosario C, Sumano H. Serum and tissue concentrations of doxycycline in broilers after the sub-cutaneous injection of a long-acting formulation. Br Poult Sci 2012; 53:366-73. [DOI: 10.1080/00071668.2012.701004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
37
|
Salas C, Gutiérrez L, Gonzalez E, Munive E, Villanego I, Diaz V, Diaz L, Peñas M. EP-1128 PATTERN CARE STUDY ON INVASIVE BLADDER CANCER AT RADIATION ONCOLOGY SERVICES IN SPAIN. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)71461-5] [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: 11/27/2022]
|
38
|
Gutiérrez L, Vargas D, Ocampo L, Sumano H, Martinez R, Tapia G. Plasma concentrations resulting from florfenicol preparations given to pigs in their drinking water. J Anim Sci 2011; 89:2926-31. [PMID: 21454858 DOI: 10.2527/jas.2010-3576] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Florfenicol administered through the drinking water has been recommended as a metaphylactic antibacterial drug to control outbreaks of respiratory diseases in pigs caused by strains of Actinobacillus pleuropneumoniae and Pasteurella multocida, yet it is difficult to pinpoint in practice when the drug is given metaphylactically or therapeutically. Further, pigs are likely to reject florfenicol-medicated water, and plasma concentrations of the drug are likely to be marginal for diseases caused by Escherichia coli, Klebsiella pneumoniae, and Staphylococcus aureus. The reported minimal inhibitory concentration (MIC) values for these organisms show a breakpoint of 2 to 3 μg/mL. An experiment was conducted during September and October 2009. One hundred twenty healthy crossbred pigs (Landrace-Yorkshire), weighing 23 ± 6.2 kg, were used in this trial. They were randomly assigned to 5 groups, with 3 replicates of 8 animals/group. Two commercial preparations of florfenicol were administered through the drinking water at 2 concentrations (0.01 and 0.015%). Water intake was measured before and after medication, and plasma concentrations of florfenicol were determined by HPLC. Considerable rejection of florfenicol-medicated water was observed. However, plasma florfenicol concentrations were of a range sufficient for a methaphylaxis approach to preventing disease by bacteria, with MIC breakpoints of ≤ 0.25 μg/mL. Decreased efficacy as a metaphylactic medication should be expected for bacteria with MIC >0.25 μg/mL, considering the reported existence of bacteria resistant to florfenicol and the natural resistance of Streptococcus suis or E. coli to this drug.
Collapse
Affiliation(s)
- L Gutiérrez
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Av. Universidad 3000, Coyoacán, México City, México
| | | | | | | | | | | |
Collapse
|
39
|
Neira P, Aguirre B, Taub T, Gutiérrez L, Sáez C, Ibarra A, Silva C. [Breast MRI--histologic correlation for ductal carcinoma in situ]. Radiologia 2009; 51:396-402. [PMID: 19406443 DOI: 10.1016/j.rx.2009.01.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2008] [Accepted: 01/09/2009] [Indexed: 11/15/2022]
Abstract
OBJECTIVE To evaluate the concordance between the breast MRI findings and the histologic findings for the size and extension of pure ductal carcinoma in situ (DCIS) and to compare this concordance with that of conventional techniques (mammography and ultrasonography). MATERIAL AND METHODS This is a retrospective study of consecutive patients diagnosed with DCIS after percutaneous biopsy. We estimated Lin's coefficient of concordance for the histologic findings with each of the three techniques. We also assessed concordance using Bland-Altman graphs. Finally, we determined the impact of the MRI findings on the surgical management of patients with DCIS. RESULTS A total of 32 patients were included in the study. Concordance between imaging and histology on tumor size was higher for MRI (0.78; 95%CI, 0.62-0.87) than for mammography (0.43; 95%CI, 0.19-0.62) or for ultrasonography (0.27; 95%CI, 0.09-0.43). MRI overestimated the size of DCIS by a mean of 3 mm, whereas mammography and ultrasonography underestimated it by 9 mm and 18 mm, respectively. MRI detected multifocality and multicentricity (7 cases) better than mammography (3) or ultrasonography (0). The MRI findings correctly changed the surgical management in six patients. CONCLUSION Breast MRI is better than conventional techniques for the evaluation of the size of DCIS. Breast MRI also detects more cases of multifocality and multicentricity. We recommend that all patients diagnosed with DCIS (especially those with dense breasts) undergo breast MRI prior to surgery.
Collapse
Affiliation(s)
- P Neira
- Servicio de Imágenes de la Mama, Clínica Las Condes, Santiago, Chile.
| | | | | | | | | | | | | |
Collapse
|
40
|
Bravo-Monsalvo A, Vázquez-Chagoyán J, Gutiérrez L, Sumano H. Clinical efficacy of neural therapy for the treatment of atopic dermatitis in dogs. Acta Vet Hung 2008; 56:459-69. [PMID: 19149101 DOI: 10.1556/avet.56.2008.4.4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The aim of this trial was to assess the clinical efficacy of neural therapy (NT) when treating canine atopic dermatitis. Eighteen dogs (no control group), with at least a 12-month history of having nonseasonal atopic dermatitis, were included. No medication with either glucocorticoids or cyclosporin was allowed during the trial. One set of NT was given by injecting an intravenous dose of 0.1 mg/kg of a 0.7% procaine solution, followed by 10 to 25 intradermal injections of the same solution in a volume of 0.1-0.3 mL per site. Dogs were given 6-13 sets of NT during the therapy. The dermatological condition of each patient was evaluated before and after the treatment using two scales: the pruritus visual analogue scale (PVAS) and the canine atopic dermatitis extent and severity index (CADESI). The reduction of pruritus was statistically significant using a Wilcoxon matched-pairs signed-ranks test (P < 0.001). No adverse side effects were observed. NT seems to be an effective alternative to control signs related to canine atopic dermatitis.
Collapse
Affiliation(s)
- Adriana Bravo-Monsalvo
- 1 National Autonomous University of Mexico (UNAM) Department of Physiology and Pharmacology, School of Veterinary Medicine Av. Universidad 3000 Mexico City 04510 Mexico
| | - Juan Vázquez-Chagoyán
- 2 Autonomous University of the State of Mexico Center for Research and Advanced Studies in Animal Health Toluca Mexico
| | - Lilia Gutiérrez
- 1 National Autonomous University of Mexico (UNAM) Department of Physiology and Pharmacology, School of Veterinary Medicine Av. Universidad 3000 Mexico City 04510 Mexico
| | - Héctor Sumano
- 1 National Autonomous University of Mexico (UNAM) Department of Physiology and Pharmacology, School of Veterinary Medicine Av. Universidad 3000 Mexico City 04510 Mexico
| |
Collapse
|
41
|
Vargas-Estrada D, Gutiérrez L, Juarez-Rodríguez I, Sumano H. Pharmacokinetics of doxycycline and tissue concentrations of an experimental long-acting parenteral formulation of doxycycline in Wistar rats. ACTA ACUST UNITED AC 2008; 58:310-5. [PMID: 18677974 DOI: 10.1055/s-0031-1296512] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Doxycycline hyclate (CAS 24390-14-5, doxycycline-h), an antibacterial with time-dependent action, was formulated as a non-irritating long-acting parenteral formulation based on a beta-cyclodextrin: poloxamer-based matrix (doxycycline-h-LA). Tissue and serum concentrations vs time profile were investigated after its subcutaneous injection to Wistar rats. Serum concentration profiles and key pharmacokinetic (PK) variables of doxycycline-h-LA were compared to the corresponding profiles and PK values obtained with an aqueous formulation of doxycycline-h administered either intramuscularly, orally or intravenously to Wistar rats. In all groups, the dose was 10 mg/kg. Doxycycline-h-LA showed outstanding bioavailability (951% or 477% if a correction formula is considered), as compared to the one obtained with an aqueous formulation (106-82%, respectively). Corresponding values for maximum serum concentration were 3.19 microg/ml and 3.00 microg/ml, respectively, and elimination half-lives were completely different: 42.49 h and 2.77 h for doxycycline-h-LA and the aqueous formulation, respectively. Considering minimal inhibitory concentrations of doxycycline for sensitive and resistant bacteria (from < or = 0.5 to > or =1.5 microg/ml), doxycycline-h-LA could be injected every 2 or 3 days, while aqueous doxycycline-h would require a dosing interval from 7.5 to 11 h. But if tissue concentrations are taken as braking points, the dosing interval will vary from 48 to 94 h. For doxycycline-h-LA, mean tissue:serum ratios were 2:1 for lungs, 9.8:1 for kidneys and 2.2:1 for intestine homogenates. These values are in close agreement with those found for the distribution of doxycycline in other species.
Collapse
Affiliation(s)
- Dinorah Vargas-Estrada
- Departamento de Fisiología y Farmacología, Facultad de Medicina Veterinaria y Zootecnia. Universidad Nacional Autónoma de México, Mexico City, Mexico
| | | | | | | |
Collapse
|
42
|
Roberge J, Harris R, O'Rourke MK, Lantz R, Meza M, Gutiérrez L. Preliminary Results of Arsenic Found in Drinking Water and Urine Among Arizonan and Sonoran Residents. Epidemiology 2007. [DOI: 10.1097/01.ede.0000276763.10001.d6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
43
|
Novoa P, Rodríguez L, Gutiérrez L. Report of the Experience With Enteric-Coated Sodium Mycophenolate in a De Novo Population of Kidney Transplant Recipients at High Risk for Delayed Graft Function. Transplant Proc 2007; 39:600-1. [PMID: 17445554 DOI: 10.1016/j.transproceed.2006.12.029] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The introduction of mycophenolate as an adjuvant in immunosuppressive regimes has improved clinical outcomes of transplant patients due to a reduced incidence of acute rejection episodes. Nevertheless, the need for dose adjustments or therapy discontinuations (up to 45% in some series), have downgraded the efficacy of mycophenolate mofetil (MMF). From October 2003 to April 2005, 36 kidney transplantations were performed at our site. The immunosuppressive protocol included induction with basiliximab, administered on days 0 and 4 posttransplantation, cyclosporine microemulsion (CsA-ME) monitored by concentrations at 2 hours (C2), enteric-coated sodium mycophenolate (EC-MPS; 720 +/- 180 mg bid), and steroids. Mean follow-up time was 7.3 +/- 4.4 months. Fourteen patients (38.9%) experienced delayed graft function (DGF). Seven (19%) episodes of acute rejection included 5 graded as I-A, 1 as grade I-B, and 1 as grade II-A. There were discontinuations of EC-MPS. Regarding gastrointestinal (GI) adverse events, there were 2 episodes of noninfectious diarrhea, 1 gastritis, and 1 upper GI hemorrhage. There were 11 infections: 4 in the urinary tract; 3 in the lung; 3 in the GI tract; and 1 CMV infection. There were no discontinuations of EC-MPS reported [corrected] Two (6%) graft losses were reported to be due to sepsis. In this group of patients who experienced a high incidence of DGF, the combination of basiliximab, CsA-ME (monitored by C2), and EC-MPS resulted in low Banff grade acute rejection episodes which were all responsive to steroids. The incidence of GI adverse events was only 11%.
Collapse
Affiliation(s)
- P Novoa
- Hospital Córdoba, Córdoba, Argentina.
| | | | | |
Collapse
|
44
|
Gutiérrez L, Díaz-de-Anda A, Flores J, Méndez-Sánchez RA, Monsivais G, Morales A. Wannier-stark ladders in one-dimensional elastic systems. Phys Rev Lett 2006; 97:114301. [PMID: 17025890 DOI: 10.1103/physrevlett.97.114301] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2006] [Indexed: 05/12/2023]
Abstract
The optical analogues of Bloch oscillations and their associated Wannier-Stark ladders have been recently analyzed. In this Letter we propose an elastic realization of these ladders, employing for this purpose the torsional vibrations of specially designed one-dimensional elastic systems. We have measured, for the first time, the ladder wave amplitudes, which are not directly accessible either in the quantum-mechanical or optical cases. The wave amplitudes are spatially localized and coincide rather well with theoretically predicted amplitudes. The rods we analyze can be used to localize different frequencies in different parts of the elastic systems and vice versa.
Collapse
Affiliation(s)
- L Gutiérrez
- Centro de Ciencias Físicas, Universidad Nacional Autónoma de México, P.O. Box 48-3, 62251 Cuernavaca Mor., Mexico
| | | | | | | | | | | |
Collapse
|
45
|
Gutiérrez L, Morales MP, Lázaro FJ. Magnetic and structural study of the state of iron in the oral haematinic ferrimannitol ovoalbumin. J Inorg Biochem 2006; 100:413-7. [PMID: 16487592 DOI: 10.1016/j.jinorgbio.2006.01.006] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2005] [Revised: 01/03/2006] [Accepted: 01/09/2006] [Indexed: 10/25/2022]
Abstract
From magnetic and structural analyses performed on ferrimannitol ovalbumin, iron in this drug is observed to be present as two-line ferrihydrite nanoparticles, of around 4 nm in diameter, which are superparamagnetic above approximately 20 K. Among other parameters, the temperature dependence of the magnetic out-of-phase susceptibility of this compound has been fully characterised and yields results clearly different from that of ferritin. This characterisation, performed for the first time for an oral haematinic, is of interest in the context of future pharmacological studies of this compound.
Collapse
Affiliation(s)
- L Gutiérrez
- Departamento de Ciencia y Tecnología de Materiales y Fluidos, CPS, Universidad de Zaragoza, Maria de Luna 3, 50018 Zaragoza, Spain.
| | | | | |
Collapse
|
46
|
Alday-Muñoz E, Maseda E, Gutiérrez L, Galván B. Hematoma epidural secundario a catéter epidural para analgesia en un paciente politraumatizado. Med Intensiva 2006; 30:30-1. [PMID: 16637430 DOI: 10.1016/s0210-5691(06)74460-6] [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: 11/24/2022]
|
47
|
Lázaro FJ, Abadía AR, Romero MS, Gutiérrez L, Lázaro J, Morales MP. Magnetic characterisation of rat muscle tissues after subcutaneous iron dextran injection. Biochim Biophys Acta Mol Basis Dis 2005; 1740:434-45. [PMID: 15949712 DOI: 10.1016/j.bbadis.2004.11.020] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2004] [Revised: 11/19/2004] [Accepted: 11/24/2004] [Indexed: 11/22/2022]
Abstract
Ex vivo freeze-dried rat muscle tissues, collected at different times t after a single dose of subcutaneously injected iron dextran, have been magnetically characterised. The AC susceptibility of the tissues shows an overall superparamagnetic behaviour and the dependence on t of, especially, the out-of-phase component is remarkably systematic despite the fact that each tissue originates in a different rat individual. The experiments show that the akaganéite (beta-FeOOH) nanoparticles contained in the injected drug are progressively degraded in the living tissue and, at times of the order of 1 month and for all the analysed rat individuals, converge to a magnetically well-defined species with much narrower magnetic activation energy distribution than iron dextran. Thorough transmission electron microscopy experiments of the same tissues indicate the presence of oxyhydroxide particles, whose size decreases for increasing t in agreement with the interpretation of the magnetic susceptibility. The conclusions drawn from the magnetic study do well correspond to the properties of the whole tissue since no biochemical extraction work has been done. The AC susceptibility appears to be a valuable and complementary tool in pharmacological studies of iron-containing drugs.
Collapse
Affiliation(s)
- F J Lázaro
- Departamento de Ciencia y Tecnología de Materiales y Fluidos, Centro Politécnico Superior, Zaragoza, Spain.
| | | | | | | | | | | |
Collapse
|
48
|
Díaz-de-Anda A, Pimentel A, Flores J, Morales A, Gutiérrez L, Méndez-Sánchez RA. Locally periodic Timoshenko rod: experiment and theory. J Acoust Soc Am 2005; 117:2814-9. [PMID: 15957752 DOI: 10.1121/1.1880732] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The flexural vibrations of a locally periodic rod, which consists of N unit cells, are discussed both from the experimental and theoretical points of view. Timoshenko's beam theory and the transfer matrix method are used to calculate the normal-mode frequencies and amplitudes. The theoretical values are then compared with the experimental ones, which are obtained using an electromagnetic acoustic transducer (EMAT). Good agreement between the numerical results and the experimental measurements is obtained. It is shown that as N grows, a band spectrum emerges.
Collapse
Affiliation(s)
- A Díaz-de-Anda
- Centro de Ciencias Físicas, Universidad Nacional Autónoma de México, A.P. 48-3, 62251, Cuernavaca, Mor., México
| | | | | | | | | | | |
Collapse
|
49
|
Gutiérrez L, Dávalos A, Pedraza S, García Sánchez C, Kulisevsky J. [Neuropsychological and behavioural impairments resulting from bilateral thalamic infarct]. Neurologia 2003; 18:404-8. [PMID: 14505251] [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: 04/27/2023] Open
Abstract
The neuropsychological characteristics of a patient with a bilateral thalamic infarct in the posterior communicating artery territory due to basilar artery thrombosis are described. MRI examination showed bilateral thalamic acute ischemic lesions in the zone anterior to the tuberothalamic branches. In the cognitive exploration, the patient showed verbal and visual memory disorders, impairment of the executive functions including inability to generate and make decisions and behavioural disorders including lack of inhibition, euphoria, and occasional aggressiveness. Two months later the patient had improved in the neuropsychological test scores but still suffered from severe recent memory loss, and certain behavioural disorders including lack of inhibition and euphoria. Other cases on thalamic infarcts with cognitive and behavioural impairments due to disconnection of the front subcortical pathways have been described in the literature.
Collapse
Affiliation(s)
- L Gutiérrez
- Servicio de Neurología, Hospital Universitario Doctor Josep Trueta, Girona.
| | | | | | | | | |
Collapse
|
50
|
Morales A, Flores J, Gutiérrez L, Méndez-Sánchez RA. Compressional and torsional wave amplitudes in rods with periodic structures. J Acoust Soc Am 2002; 112:1961-1967. [PMID: 12430808 DOI: 10.1121/1.1509431] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
To measure and detect elastic waves in metallic rods a low-frequency electromagnetic-acoustic transducer has been developed. Frequencies range from a few hertz up to hundreds of kilohertz. With appropriate configuration of the transducer, compressional or torsional waves can be selectively excited or detected. Although the transducer can be used in many different situations, it has been tested and applied to a locally periodic rod, which consists of a finite number of unit cells. The measured wave amplitudes are compared with theoretical ones, obtained with the one-dimensional transfer matrix method, and excellent agreement is obtained.
Collapse
Affiliation(s)
- A Morales
- Centro de Ciencias Físicas UNAM, Cuernavaca, Morelos, México.
| | | | | | | |
Collapse
|