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Sanchez G, Alegría M, Pesce D, Alcántara R. Localización de las proteínas específicas del cemento radicular CEMP1 y CAP en células neoplásicas. JOURNAL OF ORAL RESEARCH 2012. [DOI: 10.17126/joralres.2012.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Singer JP, Katz PP, Iribarren C, Omachi TA, Sanchez G, Yelin EH, Cisternas MG, Blanc PD. Both pulmonary and extra-pulmonary factors predict the development of disability in chronic obstructive pulmonary disease. ACTA ACUST UNITED AC 2012; 85:375-83. [PMID: 22688324 DOI: 10.1159/000338110] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Accepted: 02/28/2012] [Indexed: 11/19/2022]
Abstract
BACKGROUND Although chronic obstructive pulmonary disease (COPD) is a major cause of disability worldwide, its determinants remain poorly defined. OBJECTIVE We hypothesized that both pulmonary and extra-pulmonary factors would predict prospective disablement across a hierarchy of activities in persons with COPD. METHODS Six hundred and nine participants were studied at baseline (T0) and 2.5 years later (T1). The Valued Life Activities (VLA) scale quantified disability (10-point scale: 0 = no difficulty and 10 = unable to perform), defining disability as any activity newly rated 'unable to perform' at T1. Predictors included pulmonary (lung function, 6-minute walk distance and COPD severity score) and extra-pulmonary (quadriceps strength and lower extremity function) factors. Prospective disability risk was tested by separate logistic regression models for each predictor (baseline value and its change, T0-T1; odds ratios were scaled at 1 standard deviation per factor. Incident disability across a hierarchy of obligatory, committed and discretionary VLA subscales was compared. RESULTS Subjects manifested a 40% or greater increased odds of developing disability for each predictor (baseline and change over time). Disability in discretionary activities developed at a rate 2.2-times higher than observed in committed activities, which was in turn 2.5-times higher than the rate observed in obligatory activities (p < 0.05 for each level). CONCLUSIONS Disability is common in COPD. Both pulmonary and extra-pulmonary factors are important in predicting its development.
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El Bedoui S, Bois T, Jomard H, Sanchez G, Lebourg T, Trics E, Guglielmi Y, Bouissou S, Chemenda A, Rolland Y, Corsini M, Pérez JL. Paraglacial gravitational deformations in the SW Alps: a review of field investigations, 10Be cosmogenic dating and physical modelling. ACTA ACUST UNITED AC 2011. [DOI: 10.1144/sp351.2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AbstractCatastrophic deep-seated landslides (DSL) are generally considered to be the result of large slope deformations also known as deep-seated gravitational slope deformation (DSGSD). This paper aims to build a synthesis of multiple studies made in the Tinée Valley (southern French Alps) to assess the geometrical, kinematical, mechanical and chronological relationships between these two gravitational processes.At the scale of the valley, data issued from geological, geomorphological and 10Be dating indicate a clear geometrical link between DSGSD and DSL occurring at the base of the slope and suggest that gravitational slope evolution began after the glacial retreat (13 ka BP). This is supported by the example of the well-documented La Clapière slope. A continuous evolution process is characterized geometrically and temporally from geomorphic observations and analogue modelling. Coupling structural, geomorphological, physical and chronological studies allowed us to propose a four-dimensional (4D) deformation model mechanically correlated with progressive failure concept. The validity and variability of this reference site are discussed at the valley scale (taking Isola and Le Pra slope deformation as examples).It allows a rough estimation of the state of slope deformation at the valley scale to be constructed and the slope evolution with time to be considered. This 4D model could then be considered as a reference for other deep-seated gravitational slope deformations in comparable Alpine valleys.
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Eisner MD, Blanc PD, Omachi TA, Yelin EH, Sidney S, Katz PP, Ackerson LM, Sanchez G, Tolstykh I, Iribarren C. Socioeconomic status, race and COPD health outcomes. J Epidemiol Community Health 2011; 65:26-34. [PMID: 19854747 PMCID: PMC3017471 DOI: 10.1136/jech.2009.089722] [Citation(s) in RCA: 154] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
BACKGROUND Although chronic obstructive pulmonary disease (COPD) is a common cause of death and disability, little is known about the effects of socioeconomic status (SES) and race-ethnicity on health outcomes. METHODS The aim of this study is to determine the independent impacts of SES and race-ethnicity on COPD severity status, functional limitations and acute exacerbations of COPD among patients with access to healthcare. Data were used from the Function, Living, Outcomes and Work cohort study of 1202 Kaiser Permanente Northern California Medical Care Plan members with COPD. RESULTS Lower educational attainment and household income were consistently related to greater disease severity, poorer lung function and greater physical functional limitations in cross-sectional analysis. Black race was associated with greater COPD severity, but these differences were no longer apparent after controlling for SES variables and other covariates (comorbidities, smoking, body mass index and occupational exposures). Lower education and lower income were independently related to a greater prospective risk of acute COPD exacerbation (HR 1.5; 95% CI 1.01 to 2.1; and HR 2.1; 95% CI 1.4 to 3.4, respectively). CONCLUSION Low SES is a risk factor for a broad array of adverse COPD health outcomes. Clinicians and disease management programs should consider SES as a key patient-level marker of risk for poor outcomes.
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Hutchinson M, O'Ryan F, Chavez V, Lathon PV, Sanchez G, Hatcher DC, Indresano AT, Lo JC. Radiographic Findings in Bisphosphonate-Treated Patients With Stage 0 Disease in the Absence of Bone Exposure. J Oral Maxillofac Surg 2010; 68:2232-40. [DOI: 10.1016/j.joms.2010.05.003] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2009] [Revised: 04/01/2010] [Accepted: 05/15/2010] [Indexed: 11/27/2022]
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Eisner MD, Blanc PD, Yelin EH, Katz PP, Sanchez G, Iribarren C, Omachi TA. Influence of anxiety on health outcomes in COPD. Thorax 2010; 65:229-34. [PMID: 20335292 DOI: 10.1136/thx.2009.126201] [Citation(s) in RCA: 173] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Psychological functioning is an important determinant of health outcomes in chronic lung disease. To better define the role of anxiety in chronic obstructive pulmonary disease (COPD), a study was conducted of the inter-relations between anxiety and COPD in a large cohort of subjects with COPD and a matched control group. METHODS Data were used from the FLOW (Function, Living, Outcomes, and Work) cohort of patients with COPD (n=1202) and matched controls without COPD (n=302). Anxiety was measured using the Anxiety subscale of the Hospital Anxiety and Depression Scale. RESULTS COPD was associated with a greater risk of anxiety in multivariable analysis (OR 1.85; 95% CI 1.072 to 3.18). Among patients with COPD, anxiety was related to poorer health outcomes including worse submaximal exercise performance (less distance walked during the 6-min walk test: -66.3 feet for anxious vs non-anxious groups; 95% CI -127.3 to -5.36) and a greater risk of self-reported functional limitations (OR 2.41; 95% CI 1.71 to 3.41). Subjects with COPD with anxiety had a higher longitudinal risk of COPD exacerbation in Cox proportional hazards analysis after controlling for covariates (HR 1.39; 95% CI 1.007 to 1.90). CONCLUSION COPD is associated with a higher risk of anxiety. Once anxiety develops among patients with COPD, it is related to poorer health outcomes. Further research is needed to determine whether systematic screening and treatment of anxiety in COPD will improve health outcomes and prevent functional decline and disability.
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Lo JC, O'Ryan FS, Gordon NP, Yang J, Hui RL, Martin D, Hutchinson M, Lathon PV, Sanchez G, Silver P, Chandra M, McCloskey CA, Staffa JA, Willy M, Selby JV, Go AS. Prevalence of osteonecrosis of the jaw in patients with oral bisphosphonate exposure. J Oral Maxillofac Surg 2009; 68:243-53. [PMID: 19772941 PMCID: PMC10159647 DOI: 10.1016/j.joms.2009.03.050] [Citation(s) in RCA: 312] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2009] [Revised: 02/22/2009] [Accepted: 03/17/2009] [Indexed: 10/20/2022]
Abstract
PURPOSE Osteonecrosis of the jaw (ONJ) is a serious complication associated with bisphosphonate therapy, but its epidemiology in the setting of oral bisphosphonate therapy is poorly understood. The present study examined the prevalence of ONJ in patients receiving chronic oral bisphosphonate therapy. MATERIALS AND METHODS We mailed a survey to 13,946 members who had received chronic oral bisphosphonate therapy as of 2006 within a large integrated health care delivery system in Northern California. Respondents who reported ONJ, exposed bone or gingival sores, moderate periodontal disease, persistent symptoms, or complications after dental procedures were invited for examination or to have their dental records reviewed. ONJ was defined as exposed bone (of >8 weeks' duration) in the maxillofacial region in the absence of previous radiotherapy. RESULTS Of the 8,572 survey respondents (71 +/- 9 years, 93% women), 2,159 (25%) reported pertinent dental symptoms. Of these 2,159 patients, 1,005 were examined and an additional 536 provided dental records. Nine ONJ cases were identified, representing a prevalence of 0.10% (95% confidence interval 0.05% to 0.20%) among the survey respondents. Of the 9 cases, 5 had occurred spontaneously (3 in palatal tori) and 4 occurred in previous extraction sites. An additional 3 patients had mandibular osteomyelitis (2 after extraction and 1 with implant failure) but without exposed bone. Finally, 7 other patients had bone exposure that did not fulfill the criteria for ONJ. CONCLUSIONS ONJ occurred in 1 of 952 survey respondents with oral bisphosphonate exposure (minimum prevalence of 1 in 1,537 of the entire mailed cohort). A similar number had select features concerning for ONJ that did not meet the criteria. The results of the present study provide important data on the spectrum of jaw complications among patients with oral bisphosphonate exposure.
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Miravitlles M, Soriano JB, García-Río F, Muñoz L, Duran-Tauleria E, Sanchez G, Sobradillo V, Ancochea J. Prevalence of COPD in Spain: impact of undiagnosed COPD on quality of life and daily life activities. Thorax 2009; 64:863-8. [PMID: 19553233 DOI: 10.1136/thx.2009.115725] [Citation(s) in RCA: 445] [Impact Index Per Article: 29.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AIMS This study aimed to determine the prevalence of chronic obstructive pulmonary disease (COPD) in Spain and identify the level of undiagnosed disease and its impact on health-related quality of life (HRQL) and activities of daily living (ADL). METHODS A population-based sample of 4274 adults aged 40-80 years was surveyed. They were invited to answer a questionnaire and undergo prebrochodilator and postbronchodilator spirometry. COPD was defined as a postbronchodilator FEV(1)/FVC (forced expiratory volume in 1 s/forced vital capacity) ratio of <0.70. RESULTS For 3802 participants with good-quality postbronchodilator spirometry, the overall prevalence of COPD was 10.2% (95% CI 9.2% to 11.1%) and was higher in men (15.1%) than in women (5.6%). The prevalence of COPD stage II or higher was 4.4% (95%CI; 3.8%-5.1%). The prevalence of COPD increased with age and with cigarette smoking and was higher in those with a low educational level. A previous diagnosis of COPD was reported by only 27% of those with COPD. Diagnosed patients had more severe disease, higher cumulative tobacco consumption and more severely impaired HRQL compared with undiagnosed subjects. However, even patients with undiagnosed COPD stage I+ already showed impairment in HRQL and in some aspects of ADL compared with participants without COPD. CONCLUSIONS The prevalence of COPD in individuals between 40 and 80 years of age in Spain is 10.2% and increases with age, tobacco consumption and lower educational levels. The rate of diagnosised COPD is very high and undiagnosed individuals with COPD already have a significant impairment in HRQL and ADL.
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Eisner MD, Iribarren C, Yelin EH, Sidney S, Katz PP, Sanchez G, Blanc PD. The impact of SHS exposure on health status and exacerbations among patients with COPD. Int J Chron Obstruct Pulmon Dis 2009; 4:169-76. [PMID: 19516915 PMCID: PMC2685143 DOI: 10.2147/copd.s4681] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Secondhand smoke (SHS) is a major contributor to indoor air pollution. Because it contains respiratory irritants, it may adversely influence the clinical course of persons with chronic obstructive pulmonary disease (COPD). We used data from nonsmoking members of the FLOW cohort of COPD (n = 809) to elucidate the impact of SHS exposure on health status and exacerbations (requiring emergency department visits or hospitalization). SHS exposure was measured by a validated survey instrument (hours of exposure during the past week). Physical health status was measured by the SF-12 Physical Component Summary Score and disease-specific health-related quality of life (HRQL) by the Airways Questionnaire 20-R. Health care utilization for COPD was determined from Kaiser Permanente Northern California computerized databases. Compared to no SHS exposure, higher level SHS exposure was associated with poorer physical health status (mean score decrement -1.78 points; 95% confidence interval [CI] -3.48 to -0.074 points) after controlling for potential confounders. Higher level SHS exposure was also related to poorer disease-specific HRQL (mean score increment 0.63; 95% CI 0.016 to 1.25) and less distance walked during the Six-Minute Walk test (mean decrement -50 feet; 95% CI -102 to 1.9). Both lower level and higher level SHS exposure was related to increased risk of emergency department (ED) visits (hazard ratio [HR] 1.40; 95% CI 0.96 to 2.05 and HR 1.41; 95% CI 0.94 to 2.13). Lower level and higher level SHS exposure were associated with a greater risk of hospital-based care for COPD, which was a composite endpoint of either ED visits or hospitalizations for COPD (HR 1.52; 95% CI 1.06 to 2.18 and HR 1.40; 95% CI 0.94 to 2.10, respectively). In conclusion, SHS was associated with poorer health status and a greater risk of COPD exacerbation. COPD patients may comprise a vulnerable population for the health effects of SHS.
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Pedersen KE, Koldkjaer O, Berndtz NH, Hvidt S, Kjaer K, Midtskov C, Sanchez G. Intraerythrocytic sodium and potassium concentrations during acute and chronic digitalization. ACTA MEDICA SCANDINAVICA 2009; 211:335-9. [PMID: 6287810 DOI: 10.1111/j.0954-6820.1982.tb01958.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
To assess the cellular effects of digoxin, intraerythrocytic sodium and potassium concentrations were measured in 17 patients during the early phase of digitalization, in 45 patients on long-term therapy and in 64 non-digitalized control patients. Acute digitalization raised intraerythrocytic sodium from 11.6 +/- 0.4 to 16.7 +/- 1.0 mmol/l (mean +/- SEM) (p less than 0.01) and reduced intraerythrocytic potassium from 100.1 +/- 1.3 to 95.9 +/- 1.8 mmol/l (p less than 0.01). These changes were strongly correlated with the steady-state plasma digoxin concentration. During a few weeks of digoxin therapy, the intraerythrocytic cation composition normalized gradually. In patients on chronic treatment, neither intraerythrocytic sodium (11.3 +/- 0.3 mmol/l) nor potassium concentrations (100.0 +/- 0.6 mmol/l) differed significantly from the values of the control group (11.4 +/- 0.2 and 99.9 +/- 0.5 mmol/l, respectively). The changes in intraerythrocytic cation concentrations, induced by acute digitalization, seem to disappear during chronic administration of the drug.
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Pedersen KE, Koldkjaer O, Berndtz NH, Hvidt S, Kjaer K, Midtskov C, Sanchez G. The diagnostic value of determination of intraerythrocytic sodium and potassium concentrations versus plasma digoxin concentration in digoxin intoxication. ACTA MEDICA SCANDINAVICA 2009; 213:357-62. [PMID: 6880858 DOI: 10.1111/j.0954-6820.1983.tb03751.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Plasma digoxin measurements have proved unserviceable as a means of differentiating between toxic and non-toxic patients. In order to assess the value of a biological effect of digoxin in this discrimination, intraerythrocytic sodium and potassium concentrations were determined in 55 chronically digitalized patients of whom 10 were digoxin-intoxicated according to ECG criteria. Digitoxicity was associated with elevated intraerythrocytic sodium concentration (mean +/- SEM 19.3 +/- 1.2 versus 11.3 +/- 0.3 mmol/l, p less than 0.001) and reduced intraerythrocytic potassium concentration (94.6 +/- 2.3 versus 100.0 +/- 0.6 mmol/l, p less than 0.001) compared to non-toxic patients. Mean (+/- SEM) plasma digoxin concentrations in the two groups were 3.14 +/- 0.41 and 1.57 +/- 0.09 nmol/l, respectively (p less than 0.001). When diagnosing toxicity in chronically digitalized patients, plasma digoxin and intraerythrocytic sodium determinations showed sensitivities of 60 and 100%, respectively. The predictive values of a positive test were 75% for plasma digoxin and 83% for intraerythrocytic sodium.
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Sanchez-Moreno J, Villagran JM, Gutierrez JR, Camacho M, Ocio S, Palao D, Querejeta I, Gascon J, Sanchez G, Vieta E. Adaptation and validation of the Spanish version of the Mood Disorder Questionnaire for the detection of bipolar disorder. Bipolar Disord 2008; 10:400-12. [PMID: 18402628 DOI: 10.1111/j.1399-5618.2007.00571.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE The Mood Disorder Questionnaire (MDQ) is an instrument for the detection of patients with bipolar disorder (BD). The original English version is validated in both the psychiatric and the general population, but a validated Spanish version is not yet available. Psychometric properties of the Spanish adaptation of the MDQ in psychiatry are described. METHODS The MDQ is a self-administered questionnaire comprising a list of 13 hypomanic symptoms and two questions about concurrence of symptoms and functional impairment caused by the symptoms. We selected patients from 15 psychiatric outpatient departments, diagnosed with BD type I and II (BDI and BDII) and major depression (MD) according to DSM-IV-TR criteria (concurrent validity instrument). A control group of healthy subjects (HS) was selected. The patient-selection criteria included stability of the disorder and pharmacological treatment. The MDQ was administered to 236 subjects, distributed among the four groups, on two occasions, four weeks apart. We analysed the internal consistency, test-retest reliability, and discriminative capacity of the MDQ for the detection of patients with BD. RESULTS Concurrent validity based on diagnosis according to DSM-IV-TR was 0.83. The internal consistency, evaluated by Cronbach's alpha, was 0.90. The mean (SD) number of affirmative responses by group was: 9.8 (2.4) for BDI, 8.5 (2.8) for BDII, 2.7 (2.2) for MD, and 1.02 (1.9) for HS. Statistically significant differences between all the groups were found (Kruskal-Wallis test, p < 0.001). Concurrent validity using the diagnostic variable was 0.83. Test-retest reliability was 0.92. We analysed the scale's discriminative capacity, revealing a sensitivity value of 0.60 [95% confidence interval (CI) = 0.51-0.69] and a specificity value of 0.98 (95% CI = 0.94-0.99) in the detection of BD. The positive and negative probability ratios were 35.5 and 2.4, respectively. If we consider only seven positive responses as the discriminative criterion, sensitivity increases to 0.81 (95% CI = 0.73-0.88), the specificity value is 0.95 (95% CI = 0.89-0.98) and the positive and negative probability quotients are 16 and 5.3. CONCLUSIONS The psychometric characteristics of the Spanish version are similar to those of the original version. In the Spanish adaptation of the MDQ, seven positive responses to hypomanic symptoms show a good discriminative capacity for BD in patients attending psychiatric outpatient facilities; therefore, this cut-off score is proposed for the detection of BD in psychiatric outpatients.
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Diaz A, Prado M, Roa LM, Reina-Tosina J, Sanchez G. Preliminary evaluation of a full-time falling monitor for the elderly. CONFERENCE PROCEEDINGS : ... ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL CONFERENCE 2007; 2004:2180-3. [PMID: 17272157 DOI: 10.1109/iembs.2004.1403637] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The article presents the early outcomes of the evaluation of an intelligent accelerometer unit (IAU) utilized for detecting the falling events of elderly people . The overall design of the monitor where the IAU is integrated is briefly exposed. The outcomes of a laboratory study carried out over 8 volunteers show that the device is able to distinguish true falling events from normal activities like fast walking or going up/downstairs. The influences of the subject and the environment have been taken into account profiting from the processing capacity of the monitor distributed architecture.
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Wagoner K, Sanchez G, Nguyen AN, Enders GC, Blanco G. Different expression and activity of the alpha1 and alpha4 isoforms of the Na,K-ATPase during rat male germ cell ontogeny. Reproduction 2006; 130:627-41. [PMID: 16264093 DOI: 10.1530/rep.1.00806] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Two catalytic isoforms of the Na,K-ATPase, alpha1 and alpha4, are present in testis. While alpha1 is ubiquitously expressed in tissues, alpha4 predominates in male germ cells. Each isoform has distinct enzymatic properties and appears to play specific roles. To gain insight into the relevance of the Na,K-ATPase alpha isoforms in male germ cell biology, we have studied the expression and activity of alpha1 and alpha4 during spermatogenesis and epididymal maturation. This was explored in rat testes at different ages, in isolated spermatogenic cells and in spermatozoa from the caput and caudal regions of the epididymis. Our results show that alpha1 and alpha4 undergo differential regulation during development. Whereas alpha1 exhibits only modest changes, alpha4 increases with gamete differentiation. The most drastic changes for alpha4 take place in spermatocytes at the mRNA level, and with the transition of round spermatids into spermatozoa for expression and activity of the protein. No further changes are detected during transit of spermatozoa through the epididymis. In addition, the cellular distribution of alpha4 is modified with development, being diffusely expressed at the plasma membrane and intracellular compartments of immature cells, finally to localize to the midregion of the spermatozoon flagellum. In contrast, the alpha1 isoform is evenly present along the plasma membrane of the developing and mature gametes. In conclusion, the Na,K-ATPase alpha1 and alpha4 isoforms are functional in diploid, meiotic and haploid male germ cells, alpha4 being significantly upregulated during spermatogenesis. These results support the importance of alpha4 in male gamete differentiation and function.
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Albano C, Sanchez G. Study of the mechanical, thermal, and thermodegradative properties of virgin PP with recycled and non-recycled HDPE. POLYM ENG SCI 2004. [DOI: 10.1002/pen.11536] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Apt W, Arribada A, Zulantay I, Sanchez G, Vargas SL, Rodriguez J. Itraconazole or allopurinol in the treatment of chronic American trypanosomiasis: the regression and prevention of electrocardiographic abnormalities during 9 years of follow-up. ANNALS OF TROPICAL MEDICINE AND PARASITOLOGY 2003; 97:23-9. [PMID: 12662419 DOI: 10.1179/000349803125002751] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Several drugs are now known to have useful activity against Trypanosoma cruzi, the causative agent of human American trypanosomiasis (Chagas disease). However, the long-term effects of chemotherapy on the electrocardiographic (ECG) abnormalities associated with this disease have only been assessed for benznidiazole. In the present study, the ECG changes in 299 cases of chronic Chagas disease were followed for 9 years after treatment with itraconazole (N = 136) or allopurinol (N = 163). Among the 97 cases who were found to have ECG abnormalities immediately prior to their treatment, the two drugs appeared equally effective, such abnormalities being corrected in 23 (50%) of the 46 cardiopathy cases given itraconazole and 25 (49%) of the 51 given allopurinol (P > 0.05). Both of these 'cure rates' are much higher than the 8.1% frequency of abnormal-normal conversion observed among 198 'historical controls' (i.e. cases of chronic Chagas disease who had been left untreated; P < 0.05). Itraconazole appeared better than allopurinol at preventing the development of cardiopathy in the cases who appeared electrocardiographically normal at baseline. Among 202 such cases, only two (2.2%) of the 90 treated with itraconazole but 28 (25.0%) of the 112 given allopurinol were found to have developed ECG abnormalities during follow-up (P < 0.05). Therefore, although itraconazole and allopurinol are equally effective at reversing ECG alterations, itraconazole offers better protection against the development of new ECG abnormalities among those with chronic Chagas disease.
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Delgado JM, Marin G, Guevara R, Wasim SM, Rincon C, Sanchez G. X-ray powder diffraction study and optical characterization of the Cu(In 1−xGa x) 3Te 5semiconducting system. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302091304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Cheli VT, Adrover MF, Blanco C, Rial Verde E, Guyot-Revol V, Vidal R, Martin E, Alché L, Sanchez G, Acerbo M, Epstein AL, Jerusalinsky D. Gene transfer of NMDAR1 subunit sequences to the rat CNS using herpes simplex virus vectors interfered with habituation. Cell Mol Neurobiol 2002; 22:303-14. [PMID: 12469872 DOI: 10.1023/a:1020720001865] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
1. The aim is to study some roles of the hippocampal NMDA receptor, by modifying the expression of the essential NR1 subunit, with temporal and spatial restrictions in the central nervous system (CNS) of the rat. 2. Due to their neurotropism and the size of inserts they can accomodate, herpes simplex virus type-1 (HSV-1) derived amplicon vectors were used to transfer sequences, either in sense (+) or antisense (-) orientations, of the NR1 subunit gene, or of the green fluorescent protein (GFP) gene, into the CNS. 3. Vector expression in cell lines was followed by GFP autofluorescence, immunofluorescence and western blot. 4. The vectors were inoculated into the dorsal hippocampus of adult male Wistar rats, which were evaluated for habituation to an open field, and then, for expression of the transgenes, by autofluorescence and western blot; the expression mainly happened in pyramidal cells of CA1. 5. The animals injected with vectors carrying the NR1(+) transgene showed habituation to the new environment, as also happened with rats injected with vectors carrying only the GFP transgene. 6. In contrast, animals injected with vectors carrying NR1(-) sequence, did not show habituation. This might be retrograde amnesia or disability to record the trace, suggesting that the NR1 subunit in the dorsal hippocampus, is involved in habituation to a new environment. 7. HSV-1 derived amplicon vectors appear to be useful tools to modify endogenous gene expression, at a defined period, in restricted regions of the CNS.
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González EG, Sanchez G, Cioccia AM, Hevia P. [Absorption of fat from three dietary sources in rats with lactose induced diarrhea]. ARCHIVOS LATINOAMERICANOS DE NUTRICION 2001; 51:244-9. [PMID: 11791477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Low energy intake is one the most important factors related to nutritional wasting during diarrheal episodes and fat is the macronutrient with the highest energy value. So we intended to seek dietary fat sources, with the highest bioavailability during diarrheal episodes. Three basal (control) and three 42.8% lactose containing diets, used to induce diarrhea, were prepared with corn oil, butterfat or lard. The assay included 48 Sprague-Dawley rats, 28 d of age, initial weights of 65.5 +/- 5.2 g, distributed in 6 groups that received the diets during 15 d. The different types of fat did not affect diet intake, weight gain or fecal losses in rats without diarrhea (control). Low weight gain was found in rats with diarrhea regardless of the type of fat consumed and was related to low diet consumption. Mean fat absorption during diarrhea was as follows: butterfat 84%, lard 87% and corn oil 91%. The latter was related to lower fecal losses and higher fat absorption during the 15 d study. Considering that the three fat sources evaluated are easily purchased and widely accepted, and that nutritional management of subjects with diarrhea includes the intake of energy dense diets, it seems that the use of corn oil in these formulations could offer greater advantages.
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Novell F, Sanchez G, Sentis J, Visa J, Novell J, Novell Costa F. Laparoscopic management of Spigelian hernia. Surg Endosc 2000; 14:1189. [PMID: 11285534 DOI: 10.1007/s004640040003] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Spigelian hernia (SH) is an uncommon abdominal wall hernia. Its clinical symptoms are not characteristic, and the preoperative diagnosis is often difficult because SH can simulate the symptoms of more classical lower quadrant abdominal diseases. We report a case of SH in an 80-year-old woman that was complicated by incarceration and diagnosed by physical examination and ultrasound. At the time of presentation, she had an abdominal mass that was soft and occasionally painful, and aggravated by movements that increase intraabdominal pressure. Laparoscopic examination of the abdominal cavity identified the incarcerate jejunum ansae. The defect was a large opening in the peritoneum along the lateral margin of the rectus abdominis muscle. After dissection of the intestinal adhesions, a prosthetic polypropylene mesh was introduced and fixed with staples into the lateral abdominal wall. There were no postoperative complications. We conclude that the laparoscopic approach is a feasible alternative to the conventional open technique that is easy, safe, and allows excellent operative visualization.
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Venegas J, Salas J, Gonzalez C, Zulantay I, Diaz E, Gajardo M, Sanchez G, Solari A. Isolation and partial characterization of three DNA polymerases from Trypanosoma cruzi. Comp Biochem Physiol B Biochem Mol Biol 2000; 127:11-9. [PMID: 11126746 DOI: 10.1016/s0305-0491(00)00229-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Three distinct DNA polymerase fractions (A, B and C), were isolated from Trypanosoma cruzi epimastigote forms. Fraction A is a low molecular mass enzyme corresponding to beta-like DNA polymerase of T. cruzi. Fraction B co-purified along several purification steps with fraction A, but in the last step it was clearly separated by a phosphocellulose chromatography. Fraction C was separated from fractions A and B by binding to DEAE-cellulose column, since the other two fractions were eluted in the flowthrough. This enzyme has an apparent native molecular mass of 100 kDa and showed a high preference for poly(dC)-oligo(dG) among different template-primers tested as substrate. Western-blot and biochemical analysis strongly suggest that the three DNA polymerase fractions correspond to different molecular entities. These results are in agreement with the idea that fraction C is a new DNA polymerase of T. cruzi, not described before.
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Carmona M, Alsina M, Pintó R, Sanchez G, Guix S, Pujol M. Physicochemical studies of hepatitis A virus recombinant proteins: interaction with monolayers as membrane models. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 1999. [DOI: 10.1016/s0928-4931(99)00054-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Sanchez G, Restrepo S, Duque MC, Fregene M, Bonierbale M, Verdier V. AFLP assessment of genetic variability in cassava accessions (Manihot esculenta) resistant and susceptible to the cassava bacterial blight (CBB). Genome 1999; 42:163-72. [PMID: 10231955 DOI: 10.1139/g98-124] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cassava bacterial blight (CBB) is caused by Xanthomonas axonopodis pv. manihotis (Xam). Resistance is found in Manihot esculenta and, in addition, has been introgressed from a wild relative, M. glaziovii. The resistance is thought to be polygenic and additively inherited. Ninety-three varieties of M. esculenta (Crantz) were assessed by AFLPs for genetic diversity and for resistance to CBB. AFLP analysis was performed using two primer combinations and a 79.2% level of polymorphism was found. The phenogram obtained showed between 74% and 96% genetic similarity among all cassava accessions analysed. The analysis permitted the unique identification of each individual. Two Xam strains were used for resistance screening. Variation in the reaction of cassava varieties to Xam strains was observed for all plant accessions. The correlation of resistance to both strains, had a coefficient of 0.53, suggesting the independence of resistance to each strain. Multiple correspondence analysis showed a random distribution of the resistance/susceptibility response with respect to overall genetic diversity as measured by AFLP analysis. A total heterozygosity index was calculated to determine the diversity within clusters as well as among them. Our results demonstrate that resistance to CBB is broadly distributed in cassava germplasm and that AFLP analysis is an effective and efficient means of providing quantitative estimates of genetic similarities among cassava accessions.
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Albano C, Sanchez G, Ismayel A, Hernández P. Recovery of Plastic Low-Density Polyethylene/High-Density Polyethylene (LDPE/HDPE) Wastes. INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION 1999. [DOI: 10.1080/10236669908014178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Brito Z, Torrealba V, Sanchez G, Hernández L. Kinetic Data and Mechanisms in Diglycidylether Bisphenol A/ Ethylenediamine with Mono-and Bimetallic Fillers from Digitized Thermogravimetric Analysis. INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION 1999. [DOI: 10.1080/10236669908014179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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