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Sanchez B, Rutkove SB. The effect of profound dehydration on electrical impedance of mouseskeletal muscle. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2016; 2014:514-7. [PMID: 25570009 DOI: 10.1109/embc.2014.6943641] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
To determine if electrical impedance myography (EIM) technique can still be used safely to monitor muscle in cases of severe dehydration, we measured the electrical impedance at 1 kHz-1 MHz (37 frequencies) of n=8 wild type mice during 48 h of fluid deprivation and compared to the results of n=8 mice that were provided with water ad libitum. Based on the relative change in the R0 (8% p=0.59) parameter from the Cole impedance model, there is a nonsignificant change in regard to the muscle extracellular fluid when compared to the relative change of body weight and body water loss (19.6% p<;0.0001 and 26.1% p<;0.0001 respectively). The negligible changes of the phase at 50 kHz (1% p=0.88) confirm both the muscle fibers structural integrity and viability remained intact for that period of time. Accordingly, EIM can still be used to determine the status of muscle even during profound dehydration.
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Zychowski KE, Lucas SN, Sanchez B, Herbert G, Campen MJ. Hypoxia-induced pulmonary arterial hypertension augments lung injury and airway reactivity caused by ozone exposure. Toxicol Appl Pharmacol 2016; 305:40-45. [PMID: 27286659 DOI: 10.1016/j.taap.2016.06.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 05/10/2016] [Accepted: 06/03/2016] [Indexed: 11/29/2022]
Abstract
Ozone (O3)-related cardiorespiratory effects are a growing public health concern. Ground level O3 can exacerbate pre-existing respiratory conditions; however, research regarding therapeutic interventions to reduce O3-induced lung injury is limited. In patients with chronic obstructive pulmonary disease, hypoxia-associated pulmonary hypertension (HPH) is a frequent comorbidity that is difficult to treat clinically, yet associated with increased mortality and frequency of exacerbations. In this study, we hypothesized that established HPH would confer vulnerability to acute O3 pulmonary toxicity. Additionally, we tested whether improvement of pulmonary endothelial barrier integrity via rho-kinase inhibition could mitigate pulmonary inflammation and injury. To determine if O3 exacerbated HPH, male C57BL/6 mice were subject to either 3 weeks continuous normoxia (20.9% O2) or hypoxia (10.0% O2), followed by a 4-h exposure to either 1ppm O3 or filtered air (FA). As an additional experimental intervention fasudil (20mg/kg) was administered intraperitoneally prior to and after O3 exposures. As expected, hypoxia significantly increased right ventricular pressure and hypertrophy. O3 exposure in normoxic mice caused lung inflammation but not injury, as indicated by increased cellularity and edema in the lung. However, in hypoxic mice, O3 exposure led to increased inflammation and edema, along with a profound increase in airway hyperresponsiveness to methacholine. Fasudil administration resulted in reduced O3-induced lung injury via the enhancement of pulmonary endothelial barrier integrity. These results indicate that increased pulmonary vascular pressure may enhance lung injury, inflammation and edema when exposed to pollutants, and that enhancement of pulmonary endothelial barrier integrity may alleviate such vulnerability.
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Gomes-Alves P, Serra M, Brito C, Ricardo CP, Cunha R, Sousa MF, Sanchez B, Bernad A, Carrondo MJT, Rodriguez-Borlado L, Alves PM. In vitro expansion of human cardiac progenitor cells: exploring 'omics tools for characterization of cell-based allogeneic products. Transl Res 2016; 171:96-110.e1-3. [PMID: 26924043 DOI: 10.1016/j.trsl.2016.02.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 01/27/2016] [Accepted: 02/02/2016] [Indexed: 01/15/2023]
Abstract
Human cardiac stem/progenitor cells (hCPCs) have been shown to be capable to regenerate contractile myocardium. However, because of their relative low abundance in the heart, in vitro expansion of hCPC is mandatory to achieve necessary quantities for allogeneic or autologous cardiac regeneration therapy applications (10(6)-10(9) cells/patient). Up to now, cell number requirements of ongoing phase I/IIa trials have been fulfilled with production in static monolayer cultures. However, this manufacturing process poses critical limitations when moving to the following clinical phases where hundreds of patients will be enrolled. For this, increased process yield is required, while guaranteeing the quality of the cell-based products. In this work, we developed and validated a robust, scalable, and good manufacturing practice (GMP)-compatible bioprocess for the expansion of high-quality hCPC. We applied platforms extensively used by the biopharmaceutical industry, such as microcarrier technology and stirred systems, and assessed culture conditions' impact on hCPC's quality and potency, as required by regulatory agencies. Complementary analytical assays including gene expression microarrays and mass spectrometry-based approaches were explored to compare transcriptome, proteome, surface markers, and secretion profiles of hCPC cultured in static monolayers and in stirred microcarrier-based systems. Our results show that stirred microcarrier-based culture systems enabled achieving more than 3-fold increase in hCPC expansion, when compared with traditional static monolayers, while retaining cell's phenotype and similar "omics" profiles. These findings demonstrate that this change in the production process does not affect cell's identity and quality, with potential to be translated into a transversal production platform for clinical development of stem-cell therapies.
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Nuñez C, Ochoa S, Huerta-Ramos E, Baños I, Barajas A, Dolz M, Sanchez B, Del Cacho N, Genipe G, Usall J. Heavy cannabis use impairs verbal memory of first psychotic episode patients. Eur Psychiatry 2016. [DOI: 10.1016/j.eurpsy.2016.01.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
IntroductionCannabis consumption is known to be increased in both schizophrenic and first psychotic episode patients. Contrary to what has been reported in studies with healthy people, all published studies so far have reported no impairments or even beneficial effects on neurocognition associated with cannabis consumption in schizophrenia and first psychotic episode patients. However, these studies did not address the effects of very high cannabis consumption.ObjectiveOur aim in this study was to assess the effects on neurocognition of regular and heavy cannabis consumption in first psychotic episode patients.MethodsA total of 74 patients were included in the study and assigned to 3 different groups according to their mean cannabis consumption during the last year (non-users, regular users, and heavy users). Participants were administered verbal memory, attention, processing speed, working memory, vocabulary, arithmetic and spatial orientation tasks.ResultsOur results showed the heavy cannabis group of first psychotic episode patients to be significantly impaired in all the verbal memory measures with respect to the non-users group. There were no significant differences between regular users and non-users. Moreover, regular cannabis consumption was associated with an improvement in some attention and processing speed measures.ConclusionsOur data showed heavy cannabis consumption to impair verbal memory in first psychotic episode patients and suggest a dose-related effect of cannabis consumption, since regular consumption did not impair verbal memory and may be beneficial for other tasks.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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Ruiz-Ortiz E, Gonzalez-Roca E, Mensa-Vilaro A, Rius J, Plaza S, Anton C, Calvo I, Modesto C, Anton J, Arnal C, Alvarez C, Alvarez-Coca J, Becerra E, Bilbao N, Camacho M, Crespo J, de Diego C, Diez-Garcia LF, Espinosa L, Garcia-Escriva D, de Gracia F, Gonzalez MI, Iglesias E, Izquierdo S, Lastra B, Llobet P, Lopez B, Lopez-Gonzalez V, Martinez R, Martin-Mateos MA, Merino R, Ortega L, Peiro ME, de Soto IP, Perez-Mendez C, Rodriguez-Valverde V, Ribes A, Ruiz A, Sanchez B, Santos JL, Sevilla B, Sotoca J, Vilas J, Villoria A, Yagüe J, Arostegui JI. Clinical and genetic features of Spanish patients with Mevalonate kinase deficiency. Pediatr Rheumatol Online J 2015. [PMCID: PMC4597073 DOI: 10.1186/1546-0096-13-s1-p36] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Sanchez B, Louarroudi E, Rutkove SB, Pintelon R. Circular motion analysis of time-varying bioimpedance. Physiol Meas 2015; 36:2353-67. [PMID: 26489699 DOI: 10.1088/0967-3334/36/11/2353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
This paper presents a step forward towards the analysis of a linear periodically time-varying (PTV) bioimpedance ZPTV(jw, t), which is an important subclass of a linear time-varying (LTV) bioimpedance. Similarly to the Fourier coefficients of a periodic signal, a PTV impedance can be decomposed into frequency dependent impedance phasors, [Formula: see text], that are rotating with an angular speed of wr = 2πr/TZ. The vector length of these impedance phasors corresponds to the amplitude of the rth-order harmonic impedance |Zr( jw)| and the initial phase is given by Φr(w, t0) = [Symbol: see text]Zr( jw) + 2πrt0/TZ, with t0∈[0, T] being a time instant within the measurement time T. The impedance period TZ stands for the cycle length of the bio-system under investigation; for example, the elapsed time between two consecutive R-waves in the electrocardiogram or the breathing periodicity in case of the heart or lungs, respectively. First, it is demonstrated that the harmonic impedance phasor [Formula: see text], at a particular measured frequency k, can be represented by a rotating phasor, leading to the so-called circular motion analysis technique. Next, the two dimensional (2D) representation of the harmonic impedance phasors is then extended to a three-dimensional (3D) coordinate system by taking into account the frequency dependence. Finally, we introduce a new visualizing tool to summarize the frequency response behavior of ZPTV( jw, t) into a single 3D plot using the local Frenet-Serret frame. This novel 3D impedance representation is then compared with the 3D Nyquist representation of a PTV impedance. The concepts are illustrated through real measurements conducted on a PTV RC-circuit.
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Coletta A, Sanchez B, O'Connor A, Dalton R, Springer S, Koozehchian M, Jung YP, Simbo S, Cho M, Goodenough C, Reyes A, Sowinski R, Wilkins L, Rasmussen C, Kreider RB. Effects of matching diet type to obesity-related genotype on body composition changes in women during a six-month resistance-exercise training and walking program. J Int Soc Sports Nutr 2015. [PMCID: PMC4594788 DOI: 10.1186/1550-2783-12-s1-p16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Rubio-Abadal E, Ochoa S, Barajas A, Baños I, Dolz M, Sanchez B, Del Cacho N, Carlson J, Huerta-Ramos E, Usall J. Birth weight and obstetric complications determine age at onset in first episode of psychosis. J Psychiatr Res 2015; 65:108-14. [PMID: 25890850 DOI: 10.1016/j.jpsychires.2015.03.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 03/12/2015] [Accepted: 03/20/2015] [Indexed: 11/26/2022]
Abstract
BACKGROUND Earlier age at onset of psychosis (AOP) has been associated with poor social adjustment and clinical outcome. Genetic and environmental factors such as obstetric complications, parental history of psychosis, advanced paternal age at time of birth, low birth weight and gestational age, and use of drugs have been described as bringing AOP forward. This study aims to evaluate the relationship between AOP and these factors in a sample of first episode of psychosis (FEP) patients. METHODS Clinical and sociodemographic data, age at FEP, age of parents at birth, parental history of psychosis, drug-use habits of the mother during pregnancy and of the patient before psychotic onset, and Lewis and Murray obstetric complication scale were obtained from 90 patients with FEP. Statistical analysis was performed by means of Pearson correlations, Chi-square tests, Student T-test analyses and a linear regression model using SPSS version 22. RESULTS Pre-eclampsia, need for incubator at birth, use of forceps, parental history of psychosis, and low birth weight were associated with an earlier AOP. Use of forceps and birth weight are the variables which best predict AOP in FEP. Stimulant drugs, which were mostly used together with cannabis and cocaine, were the only substances associated with an earlier AOP. CONCLUSIONS Our findings are consistent with previous study results and underline the role of the prenatal period in the development of psychosis and the importance of careful monitoring of pregnancy and delivery, especially in cases with familial history.
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Estrada-Leypon O, Moya A, Guimera A, Gabriel G, Agut M, Sanchez B, Borros S. Simultaneous monitoring of Staphylococcus aureus growth in a multi-parametric microfluidic platform using microscopy and impedance spectroscopy. Bioelectrochemistry 2015; 105:56-64. [PMID: 26004850 DOI: 10.1016/j.bioelechem.2015.05.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Revised: 04/22/2015] [Accepted: 05/04/2015] [Indexed: 11/30/2022]
Abstract
We describe the design, construction, and characterization of a scalable microfluidic platform that allows continuous monitoring of biofilm proliferation under shear stress conditions. Compared to other previous end-point assay studies, our platform offers the advantages of integration into multiple environments allowing simultaneous optical microscopy and impedance spectroscopy measurements. In this work we report a multi-parametric sensor that can monitor the growth and activity of a biofilm. This was possible by combining two interdigitated microelectrodes (IDuEs), and punctual electrodes to measure dissolved oxygen, K+, Na+ and pH. The IDuE has been optimized to permit sensitive and reliable impedance monitoring of Staphylococcus aureus V329 growth with two- and four-electrode measurements. We distinguished structural and morphological changes on intact cellular specimens using four-electrode data modeling. We also detected antibiotic mediated effects using impedance. Results were confirmed by scanning electrode microscopy and fluorescence microscopy after live/dead cell staining. The bacitracin mediated effects detected with impedance prove that the approach described can be used for guiding the development of novel anti-biofilm agents to better address bacterial infection.
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Linck V, Sanchez B, Baubion E, Molinie V, Deligny C, Quist D, Derancourt C. [Pyoderma gangrenosum and neutrophilic aortitis preceding the development of rheumatoid arthritis]. Ann Dermatol Venereol 2015; 142:425-9. [PMID: 25863922 DOI: 10.1016/j.annder.2015.02.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 11/28/2014] [Accepted: 02/24/2015] [Indexed: 11/30/2022]
Abstract
BACKGROUND We report a case of pyoderma gangrenosum (PG) associated with a complication comprising ascending aortic dissection (neutrophilic aortitis) in a setting of rheumatoid arthritis (RA). PATIENTS AND METHODS A 79-year-old female patient was hospitalized in late 2009 for vegetating PG. Treatment with general steroids followed by colchicine and topical steroids resulted in complete healing of skin lesions. During hospitalization, the patient presented dissection of the ascending part of the aorta, for which emergency surgery proved effective. Histological examination of the excised tissue revealed diffuse neutrophilic aortitis. Diagnoses of Takayashu's disease and of lupus were ruled out. A chest CT scan showed interstitial lung disease with mild lymphocytosis in the bronchoalveolar fluid, but with no isolated pathogenic organisms. Relapse of skin lesions occurred 3 and 4 years later, associated with the development of RA, and worsening of the interstitial lung disease was noted in a scan carried out it in 2013, following which stabilization was observed in April 2014. There was no recurrence of the PG lesions. CONCLUSION To our knowledge, no other cases involving association of neutrophilic aortitis with PG and RA has been published to date. The literature describes the emergence of the concept of systemic neutrophilic dermatoses, and this notion is reinforced by the presence of a cutaneous and aortic site of the neutrophilic disease in a single patient.
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Levers K, Galvan E, Coletta A, Dalton R, Jung Y, O'Connor A, Goodenough C, Simbo S, Koozehchian M, Sanchez B, Rasmussen C, Greenwood M, Earnest C, Kreider R. Analysis of Correlational Validity Between OGTT Results and a Carbohydrate Intolerance Questionnaire. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.lb236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Sanchez B, Coletta A, Galvan E, Dalton R, O'Connor A, Koozehchian M, Reyes A, Goodenough C, Cho M, Jung Y, Levers K, Simbo S, Springer S, Wilkins L, Rasmussen C, Kreider R. Influence of Metabolic Genotyping on Weight Loss and Body Composition in Women Participating in a 6 Month Diet and Exercise Program: Preliminary Findings. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.lb240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Coletta A, Sanchez B, O'Connor A, Dalton R, Springer S, Koozehchian M, Jung Y, Simbo S, Cho M, Goodenough C, Reyes A, Galvan E, Levers K, Wilkins K, Rasmussen C, Kreider R. Influence of Obesity‐Related Genotype on Weight Loss Success and Body Composition Changes While Participating in an a 3‐Month Exercise and Weight Loss Program: Preliminary Findings. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.lb241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Sanchez B, Louarroudi E, Pintelon R. Time-invariant measurement of time-varying bioimpedance using vector impedance analysis. Physiol Meas 2015; 36:595-620. [DOI: 10.1088/0967-3334/36/3/595] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Goodenough C, Levers K, Dalton R, Galvan E, O’Connor A, Simbo S, Barringer N, Carter J, Seesselberg C, Coletta A, Jung YP, Koozehchian M, Sanchez B, Springer S, Cho M, Mertens-Talcott S, Rasmussen C, Greenwood M, Kreider R. Powdered tart cherry supplementation mitigates the post-exercise immune response with reduction in total antioxidant status and serum triglyceride levels following an acute bout of intense endurance exercise. J Int Soc Sports Nutr 2014. [PMCID: PMC4271626 DOI: 10.1186/1550-2783-11-s1-p34] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
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Galvan E, Levers K, Dalton R, Goodenough C, O’Connor A, Simbo S, Barringer N, Carter J, Seesselberg C, Coletta A, Jung YP, Koozehchian M, Sanchez B, Springer S, Cho M, Mertens-Talcott S, Rasmussen C, Greenwood M, Kreider R. Powdered tart cherry supplementation effectively reduces markers of catabolism and perceptions of muscle soreness following an acute bout of intense endurance exercise. J Int Soc Sports Nutr 2014. [PMCID: PMC4271624 DOI: 10.1186/1550-2783-11-s1-p33] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Jung YP, Goodenough C, Cho M, O’Connor A, Dalton R, Levers K, Galvan E, Barringer N, Ayadi F, Carter J, Koozechian M, Simbo S, Reyes A, Sanchez B, Coletta A, Rasmussen C, Kreider R. Thermogenic and hemodynamic effects of ingesting a pre-workout supplement with and without synephrine. J Int Soc Sports Nutr 2014. [PMCID: PMC4271628 DOI: 10.1186/1550-2783-11-s1-p35] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Cho M, Jung YP, Goodenough C, O’Connor A, Dalton R, Levers K, Galvan E, Barringer N, Ayadi F, Carter J, Koozechian M, Simbo S, Reyes A, Sanchez B, Coletta A, Rasmussen C, Kreider R. Effects of ingesting a pre-workout supplement with and without synephrine on cognitive function, perceptions of readiness to perform, and exercise performance. J Int Soc Sports Nutr 2014. [PMCID: PMC4271630 DOI: 10.1186/1550-2783-11-s1-p36] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Balana C, Sanz C, Ramirez J, Gil J, Sepúlveda J, De Las Penas R, Luque R, Gallego O, Reynes G, Carrato C, Sanchez B, Herrero A, Berrocal A, Perez Segura P, Garcia Castano A, Peralta S, Vazquez S, Fernández Perez I, Martinez-Garcia M. Mgmt Methylation in Tissue and Serum from Unresectable Glioblastoma (Gbm) Patients (P) Included in the Genom 009 Study, a Multicenter Randomized Study By the Geino Group Comparing Temozolomide (Tmz) Versus Tmz-Plus-Bevacizumab (Bev). (Clinicaltrials.Gov Nct01102595). Ann Oncol 2014. [DOI: 10.1093/annonc/mdu330.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sanchez B, Li J, Bragos R, Rutkove S. P590: Distinguishing slow- versus fast-twitch muscle via electrical impedance measurements. Clin Neurophysiol 2014. [DOI: 10.1016/s1388-2457(14)50683-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Sanchez B, Li J, Bragos R, Rutkove SB. Differentiation of the intracellular structure of slow- versus fast-twitch muscle fibers through evaluation of the dielectric properties of tissue. Phys Med Biol 2014; 59:2369-80. [PMID: 24743385 DOI: 10.1088/0031-9155/59/10/2369] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Slow-twitch (type 1) skeletal muscle fibers have markedly greater mitochondrial content than fast-twitch (type 2) fibers. Accordingly, we sought to determine whether the dielectric properties of these two fiber types differed, consistent with their distinct intracellular morphologies. The longitudinal and transverse dielectric spectrum of the ex vivo rat soleus (a predominantly type 1 muscle) and the superficial layers of rat gastrocnemius (predominantly type 2) (n = 15) were measured in the 1 kHz-10 MHz frequency range and modeled to a resistivity Cole-Cole function. Major differences were especially apparent in the dielectric spectrum in the 1 to 10 MHz range. Specifically, the gastrocnemius demonstrated a well-defined, higher center frequency than the soleus muscle, whereas the soleus muscle showed a greater difference in the modeled zero and infinite resistivities than the gastrocnemius. These findings are consistent with the fact that soleus tissue has larger and more numerous mitochondria than gastrocnemius. Evaluation of tissue at high frequency could provide a novel approach for assessing intracellular structure in health and disease.
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Springer S, Lockard B, Baetge C, Jung Y, Levers K, Galvan E, Jagim A, Simbo S, Byrd M, Oliver J, Koozehchian M, Dalton R, Khanna D, Kresta J, Sanchez B, Horrell K, Leopold T, Cho M, Rivera A, Cerda C, Chang C, Rasmussen C, Kreider R. Comparative effectiveness of popular diet programs on changes in android and gynoid body composition in women (LB301). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.lb301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Dalton R, Levers K, Galvan E, Coletta A, Jung Y, O'Connor A, Goodenough C, Simbo S, Seesselberg C, Bonin B, Koozehchian M, Sanchez B, Barringer N, Rasmussen C, Greenwood M, Kreider R. Assessment of factors related to carbohydrate intolerance III: Fasting HOMA (LB300). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.lb300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Koozehchian M, Levers K, Galvan E, Coletta A, Dalton R, Jung Y, O’Connor A, Goodenough C, Simbo S, Seesselberg C, Bonin B, Sanchez B, Barringer N, Rasmussen C, Greenwood M, Kreider R. Analysis of the validity of a carbohydrate intolerance questionnaire III (LB303). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.lb303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Jung Y, Lockard B, Baetge C, Levers K, Galvan E, Jagim A, Simbo S, Byrd M, Oliver J, Koozehchian M, Dalton R, Khanna D, Sanchez B, Kresta J, Horrell K, Leopold T, Cho M, Springer S, Rivera A, Cerda C, Chang C, Rasmussen C, Kreider R. Comparative effectiveness of popular diet programs on changes in body composition and visceral adipose tissue in women (LB297). FASEB J 2014. [DOI: 10.1096/fasebj.28.1_supplement.lb297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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