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Custodio N, Lira D, Herrera-Perez E, Nuñez Del Prado L, Parodi J, Guevara-Silva E, Castro-Suarez S, Montesinos R, Cortijo P. The Memory Alteration Test Discriminates between Cognitively Healthy Status, Mild Cognitive Impairment and Alzheimer's Disease. Dement Geriatr Cogn Dis Extra 2014; 4:314-21. [PMID: 25298775 PMCID: PMC4176469 DOI: 10.1159/000365280] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Background/Aims Dementia is a worldwide public health problem and there are several diagnostic tools for its assessment. The aim of this study was to evaluate the performance of the Memory Alteration Test (M@T) to discriminate between patients with early Alzheimer's disease (AD), patients with amnestic mild cognitive impairment (a-MCI), and subjects with a cognitively healthy status (CHS). Methods The discriminative validity was assessed in a sample of 90 patients with AD, 45 patients with a-MCI, and 180 subjects with CHS. Clinical, functional, and cognitive studies were independently performed in a blinded fashion and the gold standard diagnosis was established by consensus on the basis of these results. The test performance was assessed by means of a receiver operating characteristic curve analysis as area under the curve (AUC). Results M@T mean scores were 17.7 (SD = 5.7) in AD, 30.8 (SD = 2.3) in a-MCI, and 44.5 (SD = 3.1) in CHS. A cutoff score of 37 points had a sensitivity of 98.3% and a specificity of 97.8% to differentiate a-MCI from CHS (AUC = 0.999). A cutoff score of 27 points had a sensitivity of 100% and a specificity of 98.9% to differentiate mild AD from a-MCI and from CHS (AUC = 1.000). Conclusions The M@T had a high performance in the discrimination between early AD, a-MCI and CHS.
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Guevara Silva E, Custodio N, Lira D, Herrera Pérez E, Castro Suarez S, Núñez del Prado L, Montesinos R. Trastorno neurocognitivo asociado al virus de inmunodeficiencia humana. ANALES DE LA FACULTAD DE MEDICINA 2014. [DOI: 10.15381/anales.v75i2.8387] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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de la Luz-Hernández K, Rabasa Y, Montesinos R, Fuentes D, Santo-Tomás JF, Morales O, Aguilar Y, Pacheco B, Castillo A. Cancer vaccine characterization: from bench to clinic. Vaccine 2014; 32:2851-8. [PMID: 24641959 DOI: 10.1016/j.vaccine.2014.02.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
BACKGROUND The development of safe, effective, and affordable vaccines has become a global effort due to its vast impact on overall world health conditions. A brief overview of vaccine characterization techniques, especially in the area of high-resolution mass spectrometry, is presented. It is highly conceivable that the proper use of advanced technologies such as high-resolution mass spectrometry, along with the appropriate chemical and physical property evaluations, will yield tremendous in-depth scientific understanding for the characterization of vaccines in various stages of vaccine development. This work presents the physicochemical and biological characterization of cancer vaccine Racotumomab/alumina, a murine anti-idiotypic antibody that mimics N-glycolyl-GM3 gangliosides. This antibody has been tested as an anti-idiotypic cancer vaccine, adjuvated in Al(OH)3, in several clinical trials for melanoma, breast, and lung cancer. METHODS Racotumomab was obtained from ascites fluid, transferred to fermentation in stirred tank at 10 L and followed to a scale up to 41 L. The mass spectrometry was used for the determination of intact molecule, light and heavy chains masses; amino acids sequence analysis, N- and C-terminal, glycosylation and posttranslational modifications. Also we used the DLS for the size distribution and zeta potential analysis. The biological analyses were performed in mice and chickens. RESULTS We observed differences in glycosylation pattern, charge heterogeneity and structural stability between in vivo-produced and bioreactor-obtained Racotumomab products. Interestingly, these modifications had no significant impact on the immune responses elicited in two different animal models. CONCLUSIONS We are demonstrated that this approach could potentially be more efficient and effective for supporting vaccine research and development.
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Lloret D, Montesinos R, Capafons A. Waking self-hypnosis efficacy in cognitive-behavioral treatment for pathological gambling: an effectiveness clinical assay. Int J Clin Exp Hypn 2014; 62:50-69. [PMID: 24256479 DOI: 10.1080/00207144.2013.841474] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Cognitive-behavioral therapy for pathological gambling has a long-term success rate of more than 50%. This study evaluated the effect of self-hypnosis in cognitive-behavioral treatment of pathological gamblers. Forty-nine participants were assigned to 2 groups. Both groups received a cognitive-behavioral protocol, and Group 1, the no-hypnosis group, received an 11-session intervention and Group 2, the hypnosis group, received 7 sessions that included self-hypnosis. Both groups were equal in gambling chronicity, frequency, intensity, change motivation, and problems derived from gambling. All participants reported significant improvement in gambling behavior and consequences at both treatment end and 6-month follow-up. Data show no differences between the interventions in abstinence, therapeutic compliance, fulfillment, and satisfaction. Results suggest that self-hypnosis reinforces treatment and can be a supportive technique for future brief interventions.
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Herrera-Pérez E, Custodio N, Lira D, Montesinos R, Bendezu L. Validity of Addenbrooke's Cognitive Examination to Discriminate between Incipient Dementia and Depression in Elderly Patients of a Private Clinic in Lima, Peru. Dement Geriatr Cogn Dis Extra 2013; 3:333-41. [PMID: 24174928 PMCID: PMC3808224 DOI: 10.1159/000354948] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS Dementia and depression are different clinical conditions, but share common features, and can be indistinguishable in the initial disease stages. We aimed to establish whether the Peruvian version of the Addenbrooke's Cognitive Examination (ACE-Peru) can distinguish between the cognitive profile in patients with incipient dementia and that in patients with depression. METHODS This was a cross-sectional study to assess the performance on the ACE-Peru of 193 elderly subjects (102 with dementia, 21 with depression, and 70 healthy controls). Depending on the diagnosis, there were two groups of cognitive impairment (CI) - the primary neurodegenerative (PN-CI) subtype and the secondary to depression (SD-CI) subtype - as well as a non-CI group. The area under the curve (AUC) of the receiver-operating characteristic curve was determined to compare the diagnostic performance, using the diagnosis of CI as the gold standard. RESULTS In our sample of elderly subjects aged 59-82 years with at least 7 years of education, the ACE-Peru showed a significantly better performance than the MMSE (AUC = 0.997 vs. AUC = 0.887; p < 0.05) for the discrimination between PN-CI and SD-CI. CONCLUSIONS The ACE-Peru is able to distinguish between the cognitive profile in patients with incipient dementia and that in patients with depression.
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Custodio N, Cortijo P, Castro S, Herrera-Pérez E, Linares J, Lira D, Núñez del Prado L, Montesinos R. Análisis comparativo de las características neuropsicológicas de pacientes con demencia fronto-temporal, variante conductual y enfermedad de Alzheimer. REVISTA DE NEURO-PSIQUIATRÍA 2013. [DOI: 10.20453/rnp.v75i4.1216] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Objetivo: Describir las características neuropsicológicas de pacientes con demencia frontotemporal varianteconductual (DFTvc) y compararlas con las de pacientes con enfermedad de Alzheimer (EA). Pacientes y métodos:Se evaluó una muestra de 60 controles sanos, 60 pacientes con EA y 32 pacientes con DFTvc, empleando una bateríaneuropsicológica clásica. Resultados: Los pacientes con DFTvc tienen peor rendimiento que pacientes con EA enalgunos parámetros de atención y funciones ejecutivas (FE) y menor compromiso de la memoria. La evaluaciónde atención muestra diferencia altamente significativa en el rendimiento del Trail Making Test (TMT)-A entre EAy DFTvc (t28=-2,18, p<0,001). De la misma manera, en la evaluación de FE, sólo el TMT-B (t31= -6,8, p<0,001) ylas respuestas perseverativas en el Wisconsin Card Sorting Test (WCST) (U = 30,5, p<0,001) alcanzaron diferenciaestadísticamente significativa entre los grupos EA y DFTvc. Conclusiones: Los pacientes con DFTvc en estadiosleve a moderado presentan una relativa menor afectación de memoria, lenguaje y habilidades viso-constructivas/viso-espaciales, pero con un marcado deterioro de atención y FE.
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Custodio N, Montesinos R, Lira D, Bendezu L, Herrera E. P4–161: Validation of a Peruvian version of the Memory Alteration Test administered to people with amnestic mild cognitive impairment and early‐stage Alzheimer's disease in Lima, Peru. Alzheimers Dement 2013. [DOI: 10.1016/j.jalz.2013.05.1552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Custodio N, Herrera E, Lira D, Montesinos R, Linares J, Bendezú L. Deterioro cognitivo leve: ¿dónde termina el envejecimiento normal y empieza la demencia? ANALES DE LA FACULTAD DE MEDICINA 2013. [DOI: 10.15381/anales.v73i4.1032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Con el aumento de la prevalencia de demencia en el mundo, debemos poner especial atención a la evaluación diagnóstica de estadios previos a la demencia. El deterioro cognitivo leve (DCL) podría ser considerado un estadio precoz de demencia, en especial de la enfermedad de Alzheimer (AD); por lo que consideramos importante un diagnóstico adecuado, mediante la utilización de instrumentos y técnicas fiables y sensibles, que permitan discriminar entre sujetos con envejecimiento normal y patológico. Los estudios epidemiológicos muestran una elevada prevalencia de DCL en la población general. Asimismo, se ha documentado la progresión de DCL a demencia y EA, sobre todo en sujetos con DCL del tipo amnésico. La edad, el estado de portador del APOE- ε4, la atrofia del hipocampo en resonancia magnética y la presencia de algunos biomarcadores en líquido cefalorraquídeo parecen influir en la conversión. Se sugiere que el estudio de pacientes con sospecha de DCL sea el mismo que se emplea en la sospecha de demencia y EA. La evaluación neuropsicológica es la única prueba que permite confirmar el diagnóstico y nos ayuda a realizar una adecuada clasificación de los subtipos de DCL: amnésico, multidominio y monodominio no amnésico.
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Custodio N, Herrera-Perez E, Lira D, Montesinos R, Bendezu L. Prevalence of frontotemporal dementia in community-based studies in Latin America: a systematic review. Dement Neuropsychol 2013; 7:27-32. [PMID: 29213816 PMCID: PMC5619541 DOI: 10.1590/s1980-57642013dn70100005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Latin America (LA) is experiencing a rise in the elderly population and a
consequent increase in geriatric problems such as dementia. There are few
epidemiological studies assessing the magnitude of dementia and dementia
subtypes in LA.
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Custodio N, Montesinos R, Bendezú L, Cortijo P, Torres H, Escobar J. Efectos de inhibidores de colinesterasa en pacientes con enfermedad asociada a cuerpos de Lewy. ANALES DE LA FACULTAD DE MEDICINA 2013. [DOI: 10.15381/anales.v69i3.1133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Objetivos: Analizar los efectos de los inhibidores de colinesterasas (ICE) donepezilo, rivastigmina y galantamina en el tratamiento de demencia con cuerpos de Lewy (DCL) y demencia de la enfermedad de Parkinson (DEP). Diseño: Estudio tipo ensayo abierto. Lugar: Servicio de Neurología, Hospital Militar Central (HMC), y Unidad de Diagnóstico de Deterioro Cognitivo y Prevención de Demencia, Clínica Internacional. Participantes: Pacientes con demencia asociada a cuerpos de Lewy y demencia de la enfermedad de Parkinson. Intervenciones: Las mediciones de eficacia en 33 pacientes con diagnóstico de DCL y DEP se realizó con el Mini-Mental State Examination (MMSE), Alzheimer Disease Assessment Scale cognitive subscale (ADAS-cog), Alzheimer’s Disease Cooperative Study-Clinical Global Impression of Change (ADCS-CGIC), Alzheimer’s Disease Cooperative Study-Activities of Daily Living Inventory (ADCS-ADL), Neuro-Psychiatry Inventory (NPI), Prueba de dibujo de Reloj de Manos (PDR-M) y la Unified Parkinson´s Disease Rating Scalemotor subscale (UPDRS-part III). Principales medidas de resultados: Síntomas cognitivos, funcionamiento global y actividades de vida diaria de los pacientes. Resultados: Diecisiete pacientes fueron tratados con rivastigmina, 9 con galantamina y 7 con donepezilo. Luego de 6 meses de tratamiento, los pacientes en tratamiento con rivastigmina mejoraron en 1,39 puntos en ADAS-cog respecto de su medición basal, mientras que los pacientes tratados con donepezilo y galantamina no mostraron cambios (cambios <0,2 puntos). Respecto al ADCS-ADL, los pacientes tratados con rivastigmina, donepezilo y galantamina demostraron disminución de 0,42, 0,58 y 0,75 puntos, respectivamente. En el MMSE, los pacientes tratados con rivastigmina y donepezilo no mostraron cambios y los pacientes tratados con galantamina tuvieron una disminución promedio de 1,19 puntos. No hubo diferencias significativas en la incidencia de síntomas parkinsonianos en los tres grupos de tratamiento. Los eventos adversos fueron similares en los tres grupos de tratamiento. Conclusiones: Los inhibidores de colinesterasa pueden ser benéficos en el manejo de síntomas cognitivos, el funcionamiento global y actividades de vida diaria en pacientes con demencia con cuerpos de Lewy y demencia de la enfermedad de Parkinson.
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Custodio N, García A, Montesinos R, Escobar J, Bendezú L. Prevalencia de demencia en una población urbana de Lima-Perú: estudio puerta a puerta. ANALES DE LA FACULTAD DE MEDICINA 2013. [DOI: 10.15381/anales.v69i4.1110] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Objetivos: Calcular la prevalencia y tipos de demencia en una población de una<br />comunidad urbana de Lima. Diseño: Muestreo por conglomerados bietápico.<br />Instituciones: Instituciones de salud privadas. Pacientes: Individuos mayores de<br />65 años. Intervenciones: En el distrito de Cercado del Lima, 1 532 individuos<br />mayores de 65 años, seleccionados aleatoriamente, fueron sometidos a evaluaciones<br />neuropsicológicas breves, que incluyeron el Mini Mental State Examination (MMSE),<br />la prueba del dibujo del reloj (PDR) y el cuestionario de actividades funcionales de<br />Pfeffer (PFAQ). Según los resultados obtenidos luego de la aplicación del MMSE, PDR<br />y PFAQ, los individuos fueron clasificados como seleccionados y no seleccionados,<br />siendo el grupo de seleccionados aquellos que presentaban deterioro cognitivo<br />luego de la aplicación de dichas pruebas. El grupo de personas seleccionadas fueron<br />sometidas a evaluaciones neurológicas, neuropsicológicas, exámenes de laboratorio<br />y tomografía computada (TC) cerebral. Principales medidas de resultados:<br />Prevalencia de demencia. Resultados: Encontramos 105 casos de demencia, lo<br />que corresponde a una prevalencia de 6,85%, siendo la enfermedad de Alzheimer<br />el diagnóstico más frecuente (56,2%); dicha prevalencia se incrementó con la edad<br />y tuvo predominio en el sexo femenino. El análisis de regresión logística mostró que<br />la edad, género femenino y nivel educativo bajo se encontraban correlacionados<br />con la prevalencia alta de demencia. Conclusiones: La prevalencia de demencia en<br />esta población peruana fue 6,85% y la enfermedad de Alzheimer, el diagnóstico más<br />frecuente; la edad, el género femenino y el nivel educativo bajo fueron los factores<br />correlacionados con esta prevalencia alta.<br /><br />
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Lira D, Custodio N, Montesinos R, Torres H. Calcificaciones cerebrales extensas y corea, en hipoparatiroidismo probablemente posquirúrgico. ANALES DE LA FACULTAD DE MEDICINA 2012. [DOI: 10.15381/anales.v70i2.960] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Introducción: Las calcificaciones cerebrales pueden ser unilaterales o bilaterales; las unilaterales presentan como etiología las infecciones, infartos o traumatismos; las bilaterales pueden ser fisiológicas, metabólicas o idiopáticas. Caso clínico: Paciente mujer, de 48 años de edad, tiroidectomizada hace 27 años, tomaba levotiroxina; acudió por movimientos involuntarios coreicos y balísticos progresivos y dificultad para caminar. Se encontró hipotonía de hemicuerpo derecho y movimientos serpenteantes de miembro superior derecho, hipocalcemia, hiperfosfatemia y concentración baja de parathormona; la tomografia y resonancia magnética cerebrales evidenciaban calcificaciones bilaterales en ganglios basales y cerebelo. Recibió tratamiento con citrato de calcio, calcitriol y risperidona, con recuperación completa. Discusión: Los pacientes con calcificaciones de ganglios basales presentan síntomas extrapiramidales (20 a 30%), como parkinsonismo o coreoatetosis, convulsiones y trastornos neuropsiquiátricos. Las calcificaciones intracerebrales bilaterales se producen generalmente por depósito de calcio y otros minerales. El hipoparatiroidismo es una complicación frecuente en la tiroidectomía radical, con hipocalcemia, hiperfosfatemia y concentración baja de parathormona como el caso descrito. Algunos pacientes no desarrollan los síntomas de inmediato. El tratamiento mejora los síntomas sin alterar las calcificaciones, como en la paciente, en quien la mejoría sería por la normalización del calcio más que por la risperidona.
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Dzuba I, Durocher J, Dilbaz B, Gelisen O, Ngoc N, Montesinos R, Leon W, Blum J, Winikoff B. O207 ROUTE OF ADMINISTRATION OF OXYTOCIN IN PREVENTION OF POSTPARTUM HEMORRHAGE. Int J Gynaecol Obstet 2012. [DOI: 10.1016/s0020-7292(12)60637-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Custodio N, Lira D, Montesinos R, Gleichgerrcht E, Manes F. [Usefulness of the Addenbrooke's Cognitive Examination (Spanish version) in Peruvian patients with Alzheimer's disease and Frontotemporal Dementia]. VERTEX (BUENOS AIRES, ARGENTINA) 2012; 23:165-172. [PMID: 23145370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
INTRODUCTION The development of screening tools for the assessment of cognitive status in patients with dementia must be brief yet both highly sensitive and specific in order to ensure its clinical utility. In this sense, it is important to adapt tools widely used around the world to particular populations, allowing for a more proper validity of its use in everyday clinical practice. One of the most popular general cognitive screening tools is the Addenbrooke's Cognitive Examination (ACE), which has been adapted and validated in multiple languages and populations. OBJECTIVE To assess the usefulness of the Peruvian version of the ACE in patients with dementia. MATERIALS AND METHODS Healthy controls, patients with Alzheimer disease (AD) and patients with Frontotemporal Dementia (FTD) were assessed with the Peruvian version of the ACE, the ADAScog to determine dementia severity, and a complete neuropsychological battery. RESULTS The Peruvian version of the ACE showed very good internal consistency, strong concurrent validity as revealed by significant correlations between the ACE total score and both the MMSE and ADAScog. The ACE was able to differentiate healthy controls from patients with dementia with high discriminatory accuracy. Using a cut-off score of 86 (out of 100), the ACE was exhibited a sensitivity of 100% and a specificity of 100%.
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Custodio N, Montesinos R, Lira D, Torres H. Hipersexualidad asociada a pramipexol, en el tratamiento de síntomas parkinsonianos: revisión de la literatura, a propósito de 3 casos. ANALES DE LA FACULTAD DE MEDICINA 2011. [DOI: 10.15381/anales.v71i1.72] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Introducción: Los desórdenes del control de los impulsos han sido reportados en pacientes con enfermedad de Parkinson (EP), así como en usuarios de agonistas dopaminérgicos. Comunicamos tres casos de pacientes con síntomas parkinsonianos e hipersexualidad, un desorden del control de los impulsos, asociado al uso de pramipexol. Casos clínicos: Caso 1: Varón de 62 años de edad con EP en tratamiento con levodopa/carbidopa, que requirió inicio de pramipexol; a los doce meses presentó hipersexualidad que remitió parcialmente con escitalopram. Caso 2: Varón de 66 años de edad con EP en tratamiento con levodopa/carbidopa, entacapona y clonazepam; requirió inicio de pramipexol y a los dieciséis meses presentó hipersexualidad, que remitió totalmente con escitalopram. Caso 3: Varón de 45 años de edad con parkinsonismo secundario a encefalitis esclerosante aguda en tratamiento con risperidona, amitriptilina y clonazepam; requirió inicio de pramipexol; a los dos meses presentó hipersexualidad, recibió escitalopram, pero la hipersexualidad solo desapareció al disminuir la dosis de pramipexol; se inició levodopa/carbidopa y reapareció la hipersexualidad, que desapareció con la disminución de la dosis de levodopa/carbidopa. Conclusiones: Pramipexol podría estar asociado a hipersexualidad; pero, es necesario tener en cuenta las características relacionadas a cada enfermedad, así como los factores individuales. La hipersexualidad podría mejorar con el escitalopram, siendo necesario tratar los síntomas asociados.
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Custodio N, García A, Montesinos R, Lira D, Bendezú L. Validación de la prueba de dibujo del reloj - versión de manos - como prueba de cribado para detectar demencia en una población adulta mayor de Lima, Perú. Rev Peru Med Exp Salud Publica 2011. [DOI: 10.17843/rpmesp.2011.281.452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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Custodio N, García A, Montesinos R, Lira D, Bendezú L. Validación de la prueba de dibujo del reloj - versión de Manos - como prueba de cribado para detectar demencia en una población adulta mayor de Lima, Perú. Rev Peru Med Exp Salud Publica 2011; 28:29-34. [DOI: 10.1590/s1726-46342011000100005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Beldarraín A, Acosta N, Montesinos R, Mata M, Cremata J. Characterization of Mucor pusillus rennin expressed in Pichia pastoris: enzymic, spectroscopic and calorimetric studies. Biotechnol Appl Biochem 2000; 31:77-84. [PMID: 10744950 DOI: 10.1042/ba19990094] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The aspartic proteinase gene of Mucor pusillus rennin expressed in Pichia pastoris was characterized in terms of structural and conformational stability induced by temperature. This enzyme is 12% glycosylated, with a similar specific activity to the native fungal enzyme. The secondary structure determined by CD is mainly due to beta-sheet structures with an important contribution of aromatic components. The calorimetric studies were carried out in the temperature range in which the enzyme is most stable. The enzyme undergoes an irreversible, highly scan-rate-dependent thermal denaturation under all the experimental conditions investigated. Between pH 3.0 and 7.0, only one endotherm characterized the thermal denaturation of enzyme. At pH 5.0, the most stable condition found, the denaturation can be fitted to the two-state irreversible model. Thus the kinetic constant and activation parameters of the denaturation process could be obtained. Upon reaching pH 7.5, the denaturation is characterized by two endotherms. This evidence indicates the complex tridimensional structure of this enzyme. Finally, taking into account the conservative tertiary structure of the aspartic proteinase family we comment on our results with reference to the crystallographic structure of M. pusillus pepsin [Newman, Watson, Roychowdhury, Badasso, Cleasby, Wood, Tickle and Blundell (1993) J. Mol. Biol. 221, 1295-1309].
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Rodriguez L, Narciandi RE, Roca H, Cremata J, Montesinos R, Rodriguez E, Grillo JM, Muzio V, Herrera LS, Delgado JM. Invertase secretion in Hansenula polymorpha under the AOX1 promoter from Pichia pastoris. Yeast 1998. [DOI: 10.1002/(sici)1097-0061(199607)12:9<815::aid-yea916>3.0.co;2-h] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Rodriguez L, Narciandi RE, Roca H, Cremata J, Montesinos R, Rodriguez E, Grillo JM, Muzio V, Herrera LS, Delgado JM. Invertase secretion in Hansenula polymorpha under the AOX1 promoter from Pichia pastoris. Yeast 1996; 12:815-22. [PMID: 8840498 DOI: 10.1002/(sici)1097-0061(199607)12:9%3c815::aid-yea916%3e3.0.co;2-h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
A DNA fragment containing a transcription regulating region of the alcohol oxidase (AOX1) gene from the methylotrophic yeast Pichia pastoris was used in the construction of a vector for the expression of heterologous proteins in the methylotrophic yeast Hansenula polymorpha. We used this vector to clone the SUC2 gene from Saccharomyces cerevisiae into H. polymorpha yeast. The culture conditions for invertase production using a fed-batch culture were studied. More than 1.5 x 10(3) U/ml of biologically active invertase (1 g/l) were secreted to the cellular periplasmic space. The fermentative process was scaled up to 50 l. Invertase produced from H. polymorpha was glycosylated, but it contained significantly less carbohydrate than protein produced by S. cerevisiae. Using the Western-blot technique, it was observed that invertase secreted from H. polymorpha and invertase secreted from S. cerevisiae showed common antigenic determinants.
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Rodríguez M, Rubiera R, Penichet M, Montesinos R, Cremata J, Falcón V, Sánchez G, Bringas R, Cordovés C, Valdés M. High level expression of the B. microplus Bm86 antigen in the yeast Pichia pastoris forming highly immunogenic particles for cattle. J Biotechnol 1994; 33:135-46. [PMID: 7764729 DOI: 10.1016/0168-1656(94)90106-6] [Citation(s) in RCA: 126] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Recently, a gene coding for the Bm86 tick gut glycoprotein was cloned, expressed in Escherichia coli and shown to induce an immunological response in cattle to damage ticks engorging on these animals (Rand et al., 1989). We report here the increased expression of the Bm86 antigen from the cattle tick Boophilus microplus in the methylotrophic yeast Pichia pastoris. The recombinant protein was obtained with a purity higher than 95% by a procedure with a high yield. The conducted biochemical studies demonstrated the antigen to be glycosylated and found to form particles of around 17 to 45 nm in diameter with enhanced immunogenic properties. Ticks engorging on vaccinated cattle were significantly damaged as a result of the immune response against the recombinant antigen. This system permits the obtainment in a high yield of the tick Bm86 antigen, in a glycosylated and particulated form.
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