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1.
An. pediatr. (2003, Ed. impr.) ; 74(3): 187-191, mar. 2011. tab
Article in Spanish | IBECS | ID: ibc-88377

ABSTRACT

Introducción: La elaboración y revisión de protocolos de actuación neuropediátrica permite reducir la variabilidad de nuestra práctica médica, mejorando la asistencia. Se presenta la monitorización de nuestro protocolo de parálisis facial a frigore (PFP). Material y métodos: Se revisan los informes de urgencias e historias clínicas de los niños valorados en consulta de Neuropediatría por PFP entre julio de 2006 y agosto de 2009 (grupo 2), para conocer el grado de cumplimiento vigente de los criterios de calidad del protocolo y compararlos con los de la revisión previa (grupo 1, de marzo de 2003 a junio de 2006). También se actualizan las evidencias científicas surgidas sobre el tema. Resultados: El porcentaje de cumplimiento del grupo 1 con respecto al 2ha pasado de 85,1 a 100% en constancia de descripción de la mímica facial, de 11,1 a 31,6% en descripción de existencia o no de vesículas sugestivas de herpes zóster, de 77,7 a 84,2% en constancia de fundoscopia, y de 77,7 a 86,8% en describir la normalidad del resto de los pares craneales. Se recoge por primera vez en grupo 2 la entrega de hoja informativa para padres y pediatras, con el 21,1%. Discusión: El audit médico permite evaluar nuestra actuación y establecer líneas de mejora según las deficiencias encontradas. Se insiste en seguir mejorando la constancia escrita de los datos más relevantes y recordar la importancia de entrega de la hoja informativa para padres y pediatras, como forma de asegurar el continuum asistencial (AU)


Introduction: The preparation and review of child neurology guidelines can reduce the variability of our medical practice, thus improving health care. We present the continuous monitoring of our Bell's palsy guideline. Material and methods: Emergency and medical reports of the children seen in Child Neurology surgery from July 2006 to August 2009 (group 2) are reviewed for the purpose of finding out the present level of compliance with guideline quality criteria and compare it with the previously reviewed period (group 1, from March 2003 to June 2006). Scientific evidence on this topic is also updated. Results: Comparing the compliance rate in group 1 with group 2 shows a rise in group 2 from 85.1% to 100% in facial expression description, from 11.1% to 31.6% on whether or not there is evidence of Herpes Zoster vesicles, from 77.7% to 84.2% whether or not there is evidence fundoscopic examination, and from 77.7% to 86.8% as regards cranial nerve function remaining normal. The rate of fact sheet issue, recorded for the first time in group 2, is 21.1%. Discussion: Medical auditing allows us to evaluate our medical practice and set up ways for improvement according to the deficiencies found. We insist on striving to improve the written record of the most relevant data and never overlook the importance of issuing the fact sheets to parents and paediatricians, to ensure continuity of medical care (AU)


Subject(s)
Humans , Patient Care Planning/standards , Bell Palsy/therapy , Clinical Protocols/standards , Facial Paralysis/therapy , Clinical Audit/methods , Outcome and Process Assessment, Health Care
2.
An Pediatr (Barc) ; 74(3): 187-91, 2011 Mar.
Article in Spanish | MEDLINE | ID: mdl-21316318

ABSTRACT

INTRODUCTION: The preparation and review of child neurology guidelines can reduce the variability of our medical practice, thus improving health care. We present the continuous monitoring of our Bell's palsy guideline. MATERIAL AND METHODS: Emergency and medical reports of the children seen in Child Neurology surgery from July 2006 to August 2009 (group 2) are reviewed for the purpose of finding out the present level of compliance with guideline quality criteria and compare it with the previously reviewed period (group 1, from March 2003 to June 2006). Scientific evidence on this topic is also updated. RESULTS: Comparing the compliance rate in group 1 with group 2 shows a rise in group 2 from 85.1% to 100% in facial expression description, from 11.1% to 31.6% on whether or not there is evidence of Herpes Zoster vesicles, from 77.7% to 84.2% whether or not there is evidence fundoscopic examination, and from 77.7% to 86.8% as regards cranial nerve function remaining normal. The rate of fact sheet issue, recorded for the first time in group 2, is 21.1%. DISCUSSION: Medical auditing allows us to evaluate our medical practice and set up ways for improvement according to the deficiencies found. We insist on striving to improve the written record of the most relevant data and never overlook the importance of issuing the fact sheets to parents and paediatricians, to ensure continuity of medical care.


Subject(s)
Bell Palsy/diagnosis , Bell Palsy/therapy , Guideline Adherence , Adolescent , Child , Child, Preschool , Humans , Infant , Infant, Newborn , Retrospective Studies
3.
Rev Calid Asist ; 25(5): 291-300, 2010.
Article in Spanish | MEDLINE | ID: mdl-20621533

ABSTRACT

The experience and learning process of preparing a scientific conference programme, organising and conducting a conference ccompletes the quality circle with the quantitative and qualitative assessment of the process and results. The transmission of this experience and learning process through this paper will improve the performance of committees of future conference venues, partners and participants and collaborators. The method for performing this evaluation is the assessment of the activities of both the scientific and organising committees of the XXVI Conference of the Spanish Society of Quality Healthcare in October 2008 in Zaragoza. The methodology evaluated the observance of the timetable and tasks assigned to the committees in the Congress Manual of the society along with the presentation of final results of the congress concerning scientific participation and overall satisfaction. There were a total of 1211 communications with a rejection rate of 9.1%. Of the total, 577 communications were presented in oral format and 544 in poster format. Aragon was the community of origin of 24% of communications. By subject areas, those of most interest were patient safety, organisational and management processes, and patient perspectives. A total of 83 participants attended 7 of the 11 workshops offered. The average attendance for each workshop was 12 people. The response rate to the assessment of workshops questionnaire was 54.2% with an average score of 4 (scale of 1 to 5). A total of 1131 people attended the conference of which 17% (193) were SECA associates. Out of a total of 1075 overall satisfaction conference questionnaires distributed there was a response rate of 9.30% (100). The scientific content was assessed with an average score of 3.6 and the organization with 3.87, both on a total score of 5 points. According to the number of abstracts received, number of conferences, level of satisfaction with the scientific program and organisation, we can conclude that the XXVI Conference of the Society has been a success, although we are still in our continuous quality improvement circle that will make conferences even better.


Subject(s)
Quality of Health Care , Congresses as Topic , Societies, Scientific , Spain
7.
Neurologia ; 24(5): 292-6, 2009 Jun.
Article in Spanish | MEDLINE | ID: mdl-19642030

ABSTRACT

INTRODUCTION: Quality of care involves meeting the needs and expectations of patients with the lowest consumption of resources and in accordance with scientific knowledge. In this context it is important to know if the changes in medical care procedures based on scientific and technical aspects of the quality positively impacts both efficiency measures and perceived quality. METHODS: Prospective study carried out during the 2000-2006 period at the neurology department of a public hospital with has 1303 beds. Changes in medical care introduced: adequacy of a high resolution hospitalization zone, setting up of three care pathways (transient ischemic attach [TIA], multiple sclerosis exacerbation and first epileptic seizure) and practice guidelines for stroke, and implementation of neurological care at the emergency department. RESULTS: There has been an increase in the number of patients treated in the emergency department of the hospital (17%), although the number of admissions has stabilized. In the neurology department, the number of admissions has decreased by 20%, especially those arising from TIA (decrease by 47%), the average stay has been reduced by 30% (especially in demyelinating and vascular disease, which has fallen by 50%). Adjusted average length of stay has remained below 1 and the complexity index above 1. Satisfaction with the information and health care has undergone little change. CONCLUSIONS: The changes in clinical practice to improve the quality of care have been associated with improvements in the efficiency indicators but not in patient satisfaction. The improvement in the perceived quality probably requires specific actions.


Subject(s)
Delivery of Health Care/standards , Efficiency, Organizational , Neurology/standards , Quality of Health Care , Emergency Service, Hospital/standards , Humans , Patient Satisfaction , Prospective Studies , Quality Assurance, Health Care
8.
Neurología (Barc., Ed. impr.) ; 24(5): 292-296, jun. 2009. ilus
Article in Spanish | IBECS | ID: ibc-77809

ABSTRACT

Introducción. La calidad asistencial supone satisfacer las necesidadesy expectativas de los pacientes con el menor consumo de recursosy de acuerdo al conocimiento científico. En este contexto esimportante conocer si los cambios en los procesos asistenciales basadosen aspectos científico-técnicos de la calidad repercuten positivamentetanto en medidas de eficiencia como de calidad percibida.Métodos. Estudio prospectivo durante el período 2000-2006realizado en el servicio de neurología de un hospital de tercer nivelde la red del Sistema Nacional de Salud que dispone de 1.303 camas.Cambios asistenciales introducidos: adecuación de una zona de hospitalizaciónde alta resolución, implantación de tres vías clínicas(accidente isquémico transitorio [AIT], exacerbación de esclerosismúltiple y primera crisis epiléptica) y del proceso de atención al pacientecon ictus y mejora de la atención neurológica en el servicio deurgencias.Resultados. En el hospital se ha producido un incremento en elnúmero de urgencias atendidas (17%), estabilizándose el número deingresos. En neurología ha disminuido el número de ingresos en un20%, especialmente los debidos a AIT (disminución del 47 %), la estanciamedia se ha reducido en un 30% (especialmente en patologíavascular y desmielinizante, donde ha disminuido un 50 %), elíndice de estancia media ajustada al funcionamiento se ha mantenidopor debajo de 1 y el índice de complejidad por encima de 1. La satisfaccióncon la información y atención médica han experimentadopocos cambios.Conclusiones. Los cambios de práctica clínica para mejorar lacalidad asistencial se han asociado con mejoras en los indicadores deeficiencia, pero no en los de satisfacción del paciente. La mejora decalidad percibida probablemente requiera actuaciones específicas (AU)


Introduction. Quality of care involves meeting the needsand expectations of patients with the lowest consumption of resourcesand in accordance with scientific knowledge. In this contextit is important to know if the changes in medical care proceduresbased on scientific and technical aspects of the qualitypositively impacts both efficiency measures and perceived quality.Methods. Prospective study carried out during the 2000-2006period at the neurology department of a public hospital with has1303 beds. Changes in medical care introduced: adequacy of ahigh resolution hospitalization zone, setting up of three carepathways (transient ischemic attach [TIA], multiple sclerosis exacerbationand first epileptic seizure) and practice guidelines forstroke, and implementation of neurological care at the emergencydepartment.Results. There has been an increase in the number of patientstreated in the emergency department of the hospital (17%),although the number of admissions has stabilized. In the neurologydepartment, the number of admissions has decreased by20%, especially those arising from TIA (decrease by 47 %), theaverage stay has been reduced by 30% (especially in demyelinatingand vascular disease, which has fallen by 50%). Adjustedaverage length of stay has remained below 1 and the complexityindex above 1. Satisfaction with the information and health carehas undergone little change.Conclusions. The changes in clinical practice to improvethe quality of care have been associated with improvements in theefficiency indicators but not in patient satisfaction. The improvementin the perceived quality probably requires specific actions (AU)


Subject(s)
Humans , Efficiency, Organizational , Quality of Health Care , 50230 , Neurology/standards , Emergency Service, Hospital/standards , Patient Satisfaction , Prospective Studies
10.
Rev Neurol ; 45(4): 205-10, 2007.
Article in Spanish | MEDLINE | ID: mdl-17668400

ABSTRACT

INTRODUCTION: As result of our aim to improve the quality standard of our emergency system, work has been carried out in relation to the development and monitorization of effective clinical protocols in the department of paediatric practice. PATIENTS AND METHODS: An evidence based review approach was taken to design a clinical protocol about Bell's palsy condition for the paediatric emergency department. Previous protocol approved in March 2003 was reviewed accordingly with the new designed protocol's quality standards. The Bell's palsy cases reported since March 2003 until June 2006 to paediatric emergency department were analyzed. RESULTS: A total of 27 patients affected by Bell's palsy were reported to the hospital's emergency department. Facial expression was described in 85.19% of the cases. Cranial nerves normal function was reported in 77.78%. Fundoscopic examination was described in 77.78% and otoscopic findings in 44.44%; the absence of herpes vesicles was analyzed only in 11.11%. All patients received steroid therapy (prednisone) and the treatment resulted in the complete recovery. The mean time to resolution was 58.6 days. CONCLUSIONS: In order to improve hospital's quality standards, clinical protocols should be designed and verified regularly to ensure the proper performance. Medical auditing also contributes to improve effectiveness in health attendance.


Subject(s)
Clinical Protocols , Emergency Service, Hospital , Facial Paralysis , Pediatrics , Adolescent , Child , Child, Preschool , Clinical Protocols/standards , Emergency Service, Hospital/standards , Facial Paralysis/diagnosis , Facial Paralysis/therapy , Female , Hospital Departments/standards , Humans , Male , Pediatrics/standards , Quality Control , Quality of Health Care
13.
Brain Res Bull ; 53(2): 153-62, 2000 Sep 15.
Article in English | MEDLINE | ID: mdl-11044591

ABSTRACT

Chagas' disease, caused by the protozoan Trypanosoma cruzi, is characterized by an acute phase in which parasites circulate in the blood and proliferate in several cell types, especially muscle cells. A life-long chronic phase follows the acute phase. In young patients, the acute phase is more severe, and meningoencephalitis frequently occurs in children before 2 years of age. Parasites have been rarely observed in neurons but their presence inside glial cells has been reported without characterization of the glial cell type. The cells involved in the brain reaction to the parasites and the time course of this reaction remain to be studied. Therefore, using suckling and juvenile rats and different T. cruzi populations, we aimed at determining the brain target for parasite proliferation and the cells involved in the brain reaction. Around the middle of the acute phase, histological and ultrastructural findings indicated that T. cruzi proliferates in astrocytes, forming nests devoid of enclosing membrane as described for non-glial cells. The brain nodular reaction comprised astrocytes, microglia, macrophages and neutrophils. Resting microglia was devoid of parasites in contrast to macrophages and neutrophils that probably participate in parasite removal. Suckling animals were significantly more affected, the numbers of nests and nodules varying with inoculum size. Histoquantitative analysis showed higher number of nests at the parasitemic peak (day 13) and drastic fall at day 20 post-inoculation. The highest number of nodules occurred at day 20 with drastic reduction at day 30. Recovery from histopathological alterations occurred even in surviving younger animals.


Subject(s)
Animals, Newborn/parasitology , Astrocytes/parasitology , Brain/pathology , Brain/parasitology , Cell Division/physiology , Chagas Disease/parasitology , Host-Parasite Interactions/physiology , Trypanosoma cruzi/parasitology , Age Factors , Animals , Astrocytes/pathology , Astrocytes/ultrastructure , Brain/ultrastructure , Cell Count , Chagas Disease/pathology , Macrophages/parasitology , Macrophages/pathology , Macrophages/ultrastructure , Male , Microglia/parasitology , Microglia/pathology , Microglia/ultrastructure , Neurons/parasitology , Neurons/pathology , Neurons/ultrastructure , Neutrophils/parasitology , Neutrophils/pathology , Neutrophils/ultrastructure , Parasitemia/parasitology , Parasitemia/physiopathology , Rats , Rats, Sprague-Dawley , Time Factors , Trypanosoma cruzi/physiology , Trypanosoma cruzi/ultrastructure
14.
Aten Primaria ; 25(6): 383-9, 2000 Apr 15.
Article in Spanish | MEDLINE | ID: mdl-10857227

ABSTRACT

OBJECTIVE: To find the effectiveness of a programme of preventive activities for adults (hypertension, tobacco and alcohol) measured by the number of cases identified, the evaluation of the initial interventions and the degree of control over the identified factors. DESIGN: Retrospective study: review of clinical records. SETTING: Primary care. Multi-centre study: health centres from the whole of Spain. PATIENTS: 7562 clinical records of patients over 20, who participated voluntarily and were extracted by systematic sampling from 378 care units (doctor and nurse) at 85 health centres committed to the Programme of Preventive Activities and Health Promotion (PAPPS) of the Spanish Society of Family and Community Medicine (semFYC). The study period was from May 1 1995 to April 30 1997. MEASUREMENTS AND MAIN RESULTS: Age, sex, data on tobacco habit, alcohol consumption and blood pressure were obtained through a questionnaire (recording the actions taken, date of diagnosis, initial assessment and subsequent monitoring). 28.3% were tobacco-dependent, 6.9% consumed too much alcohol, and 22.2% had hypertension. About 20% cases of each risk factor were detected during the study period. Giving up tobacco was recorded in 7.6% of smokers, and giving up alcohol in 19.7% of excess drinkers. 78.6% of hyperintense patients had acceptable-optimum control. CONCLUSIONS: The number of cases detected shows that the PAPPS programme performs acceptably. The tobacco and drink given up and the hypertension control attained due to the intervention are similar to the published trials. The PAPPS is an effective programme for controlling risk factors in primary care.


Subject(s)
Health Promotion , Preventive Medicine , Program Evaluation , Alcoholism/epidemiology , Blood Pressure Determination , Community Medicine , Family Practice , Female , Humans , Male , Middle Aged , Retrospective Studies , Risk Factors , Smoking/epidemiology , Spain
15.
Aten. prim. (Barc., Ed. impr.) ; 25(6): 383-389, abr. 2000.
Article in Es | IBECS | ID: ibc-4384

ABSTRACT

Objetivo. Conocer la efectividad de un programa de actividades preventivas en el adulto (hipertensión arterial [HTA], tabaco y alcohol) medida por el número de casos detectados, evaluación de las intervenciones iniciales y el grado de control de los factores detectados. Diseño. Retrospectivo; revisión de historias clínicas. Emplazamiento. Atención primaria. Estudio multicéntrico: centros de salud de toda España. Población. Un total de 7.562 historias clínicas de pacientes de edad mayor de 20 años, extraídos mediante muestreo sistemático de 378 unidades asistenciales (médico + enfermera) de 85 centros de salud adscritos al Programa de Actividades Preventivas y de Promoción de la Salud (PAPPS) de la Sociedad Española de Medicina de Familia y Comunitaria (semFYC) que participaron voluntariamente. El período de estudio fue entre el 1 de mayo de 1995 y el 30 de abril de 1997. Mediciones y resultados principales. Mediante cuestionario, se obtuvo: edad, sexo y datos sobre hábito tabáquico, consumo de alcohol y toma de presión arterial (consta la actividad, fecha del diagnóstico, valoración inicial y control posterior). La proporción de individuos con tabaquismo fue del 28,3 por ciento, de consumo excesivo de alcohol 6,9 por ciento y de HTA 22,2 por ciento. Alrededor de un 20 por ciento de casos de cada factor de riesgo fue detectado en el período de estudio. Estaba registrado el abandono del hábito en un 7,6 por ciento de fumadores y en el 19,7 por ciento de los bebedores excesivos. Un 78,6 por ciento de los hipertensos tenía un grado de control aceptable-óptimo. Conclusiones. El número de casos detectados indica un aceptable rendimiento del programa PAPPS. En cuanto al resultado de la intervención, los abandonos del hábito tabáquico y consumo de alcohol, así como el grado de control de la HTA son cercanos a los ensayos publicados. El PAPPS es un programa efectivo para el control de factores de riesgo en atención primaria (AU)


Subject(s)
Middle Aged , Male , Female , Humans , Patient Discharge , Preventive Medicine , Primary Health Care , Hospital Records , Health Promotion , Program Evaluation , Risk Factors , Tobacco Use Disorder , Spain , Confidence Intervals , Chi-Square Distribution , Retrospective Studies , Blood Pressure Determination , Community Medicine , Chronic Disease , Continuity of Patient Care , Alcoholism , Family Practice
16.
J Hum Lact ; 15(2): 113-20, 1999 Jun.
Article in English | MEDLINE | ID: mdl-10578786

ABSTRACT

Little is known about the nutrition of the infants of the Fulani, migratory nomads of the western Sahel of Africa. Milk was collected from 18 Fulani women 10 to 30 days postpartum and the fatty acid compositions of the triacylglycerol and phospholipid fractions were determined by capillary gas-liquid chromatography. De novo fatty acids (10:0-14:0) comprised 36.3 +/- 12.7% of fatty acids of the triacylglycerols. Compared to the milk of various populations worldwide, the milk of the Fulani women contained adequate proportions of alpha-linolenic acid (0.50 +/- 0.16%) and arachidonic acid (0.42 +/- 0.22%), but relatively low amounts of linoleic acid (9.95 +/- 2.13%) and docosahexaenoic acid (DHA) (0.15 +/- 0.08%). In addition, the milk of the Fulani women contained adequate concentrations of beta-carotene (1.58 +/- 0.69 micrograms/dl) and vitamin A (42.7 +/- 40.3 micrograms/dl), but very low levels of vitamin E (0.11 +/- 0.10 mg/dl). These data indicate that exclusively breasted infants of Fulani women were receiving relatively low amounts of critical fatty acids and vitamin E.


Subject(s)
Breast Feeding/ethnology , Fatty Acids/analysis , Milk, Human/chemistry , Transients and Migrants , Adolescent , Adult , Female , Humans , Infant Nutritional Physiological Phenomena , Infant, Newborn , Niger , Nigeria , Nutritive Value , Vitamin A/analysis , Vitamin E/analysis , beta Carotene/analysis
18.
Am J Pathol ; 153(2): 567-77, 1998 Aug.
Article in English | MEDLINE | ID: mdl-9708816

ABSTRACT

The respective roles of apoptosis and accidental cell death after thermal injury were evaluated in normal human epidermal keratinocytes. By coupling the LIVE/DEAD fluorescence viability assay with the terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL) method and ultrastructural morphology, these two processes could be distinguished. Cells were grown on glass coverslips with a microgrid pattern so that the results of several staining procedures performed sequentially could be visualized in the same cells after heating at temperatures of up to 72 degrees C for 1 second. After exposure to temperatures of 58 to 59 degrees C, cells died predominantly by apoptosis; viable cells became TUNEL positive, indicating degradation of DNA. After exposure to temperatures of 60 to 66 degrees C, both TUNEL-positive viable cells and TUNEL-positive nonviable cells were observed, indicating that apoptosis and accidental cell death were occurring simultaneously. Cells died almost immediately after exposure to temperatures above 72 degrees C, presumably from heat fixation. The fluorescent mitochondrial probe MitoTracker Orange indicated that cells undergoing apoptosis became TUNEL positive before loss of mitochondrial function. Nucleosomal fragmentation of DNA analyzed by enzyme-linked immunosorbent assay and gel electrophoresis occurred after exposure to temperatures of 58 to 59 degrees C. The characteristic morphological findings of cells undergoing apoptosis, by transmission electron microscopy, included cellular shrinkage, cytoplasmic budding, and relatively intact mitochondria. Depending on temperature and time of exposure, normal human epidermal keratinocytes may die by apoptosis, accidental cell death, or heat fixation.


Subject(s)
Apoptosis , Cell Death , Hot Temperature/adverse effects , Keratinocytes/pathology , Blotting, Western , Cell Survival , Cells, Cultured , HSP70 Heat-Shock Proteins/biosynthesis , Humans , Keratinocytes/metabolism , Microscopy, Electron , Mitochondria/pathology , Mitochondria/physiology , Time Factors , Tumor Suppressor Protein p53/biosynthesis
19.
J Lipid Res ; 39(3): 604-12, 1998 Mar.
Article in English | MEDLINE | ID: mdl-9548592

ABSTRACT

In the eye, hydrolysis of stored retinyl esters is catalyzed by retinyl ester hydrolase (REH) activities in retinal pigment epithelium (RPE) membranes. In the present study, biochemical analyses were conducted to determine the substrate specificity of these activities. Specific activities determined for hydrolysis of various retinol isomers of retinyl palmitate (9-cis-, 11-cis-, 13-cis-, and all-trans-retinyl palmitates) indicated that 11-cis-retinyl palmitate is preferentially hydrolyzed (1.7 nmol/min/mg) compared to the other isomers (0.1-0.3 nmol/min/mg). Examination of the specificity of REH activity for 11-cis-retinyl esters of varied acyl chain length (-myristate, -palmitate, and -stearate) and degree of saturation (-oleate and -linoleate) further demonstrated that palmitate is the preferred fatty acyl moiety. Notably, retinyl esters possessing chain lengths which more closely approximate that of the palmitate ester exhibited higher rates of hydrolysis. Similar results were obtained in retinyl ester-plasma membrane fusion studies in which hydrolysis took place within the membrane domain rather than at the lipid-water interface. REH substrate specificity was further assessed in competition studies in which 11-cis-retinyl palmitate hydrolysis was monitored in the presence of 13-cis-, 9-cis-, or all-trans-retinyl palmitate. Results show that addition of these retinyl palmitate isomers does not affect the rate of hydrolysis of 11-cis-retinyl palmitate. However, the hydrolytic rates associated with other retinyl palmitate isomers were significantly reduced in the presence of 11-cis-retinyl palmitate. Finally, cholesterol ester hydrolase activity was found to be distinct from the observed 11-cis-REH activity and the presence of cholesterol oleate did not affect the rate of 11-cis-retinyl palmitate hydrolysis. Collectively, these data support the hypothesis that a distinct, membrane-associated, 11-cis-retinyl palmitate-specific retinyl ester hydrolase activity exists in the retinal pigment epithelium.


Subject(s)
Carboxylic Ester Hydrolases/metabolism , Pigment Epithelium of Eye/enzymology , Animals , Binding, Competitive , Cattle , Diterpenes , Fatty Acids/metabolism , Hydrolysis , Kinetics , Palmitates/metabolism , Retinyl Esters , Substrate Specificity , Vitamin A/analogs & derivatives , Vitamin A/chemistry , Vitamin A/metabolism
20.
Am J Physiol ; 272(6 Pt 1): C1988-94, 1997 Jun.
Article in English | MEDLINE | ID: mdl-9227428

ABSTRACT

Thermal injury by short pulses (1-30 s) of relatively high temperature (50-68 degrees C) was investigated in normal human epidermal keratinocytes (NHEK). NHEK were cultured on plastic cover-slips and dipped in medium held at various temperatures. Survival assessed by methylthiazol tetrazolium reduction assay at 6 days postheating demonstrated an inverse time-temperature relationship that indicated that most cells could survive after a 1-s, 60 degrees C exposure or a 30-s, 55 degrees C exposure. Arrhenius plots of the data indicated major transition points for cell injury at 50 and 60 degrees C. Heat shock protein 70 (HSP70) and interleukin-8 (IL-8) were both induced by elevation of temperature between 50 and 60 degrees C for as short a time as 1 s. HSP70 synthesis stimulated by short, high pulses of heat appeared to induce thermotolerance. These results demonstrate that brief exposure to relatively high temperature can induce HSP70 and IL-8 synthesis in keratinocytes.


Subject(s)
Cell Survival , Epidermal Cells , Epidermis/physiology , HSP70 Heat-Shock Proteins/biosynthesis , Interleukin-8/biosynthesis , Keratinocytes/cytology , Keratinocytes/physiology , Cells, Cultured , Coloring Agents , Female , Hot Temperature , Humans , Kinetics , Mammaplasty , Tetrazolium Salts , Thiazoles , Time Factors
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