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Amyotrophic lateral sclerosis (ALS) is an aggressive neurodegenerative disorder that selectively attacks motor neurons in the brain and spinal cord. Despite important advances in the knowledge of the etiology and progression of the disease, there are still no solid grounds in which a clinician could make an early objective and reliable diagnosis from which patients could benefit. Diagnosis is difficult and basically made by clinical rating scales (ALSRs and El Escorial). The possible finding of biomarkers to aid in the early diagnosis and rate of disease progression could serve for future innovative therapeutic approaches. Recently, it has been suggested that ALS has an important immune component that could represent either the cause or the consequence of the disease. In this report, we analyzed 19 different cytokines and growth factors in the cerebrospinal fluid of 77 ALS patients and 13 controls by decision tree and PanelomiX program. Results showed an increase of Adipsin, MIP-1b, and IL-6, associated with a decrease of IL-8 thresholds, related with ALS patients. This biomarker panel analysis could represent an important aid for diagnosis of ALS alongside the clinical and neurophysiological criteria.
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Proteínas Adaptadoras de Transdução de Sinal/líquido cefalorraquidiano , Esclerose Lateral Amiotrófica/líquido cefalorraquidiano , Fator D do Complemento/líquido cefalorraquidiano , Interleucina-8/líquido cefalorraquidiano , Adulto , Biomarcadores/líquido cefalorraquidiano , Estudos de Casos e Controles , Feminino , Humanos , Masculino , Pessoa de Meia-IdadeRESUMO
OBJECTIVE: To determine the frequency of fecal incontinence and the impact on the quality of life of hospitalized geriatric patients in a sample from a level two hospital in Monterrey, Nuevo Leon, Mexico. MATERIALS AND METHODS: Hospitalized patients over 60 years of age or their caregivers were questioned about the presence of fecal incontinence. Those who responded affirmatively and could respond were given the following questionnaires and scales: Mini-Mental, Rockwood quality of life for fecal incontinence and Wexner scale modified for severity of incontinence; in addition to clinical data. The frequency was calculated based on a sample and associations were determined between degree of incontinence and quality of life. RESULTS: A total of 234 patients were questioned, of whom 135 (57.69%) were women and 99 (42.31%) men. A total of 34 patients with fecal incontinence were documented, this represents a frequency of 14.53% (95% CI, 10.28-19.71%) in this population. A positive correlation of the severity of incontinence was found with the lifestyle dimension (relation (r) = -0.61, p = 0.04), shame (r = -0.70, p = 0.01), behavior (r = -0.73, p = 0.001) and the average of the four dimensions (r = -0.67, p = 0.02) but not with the depression dimension of the quality of life questionnaire in fecal incontinence. CONCLUSION: When compared with other national and international studies, the frequency of fecal incontinence found was lower than that documented in other series. The quality of life of hospitalized elderly patients with fecal incontinence in this sample was diminished and its impact on quality of life correlated with the severity of fecal incontinence.
Assuntos
Incontinência Fecal/epidemiologia , Hospitalização , Qualidade de Vida , Idoso , Idoso de 80 Anos ou mais , Incontinência Fecal/diagnóstico , Feminino , Humanos , Masculino , México/epidemiologia , Pessoa de Meia-Idade , Índice de Gravidade de DoençaRESUMO
Objetivo: Determinar la frecuencia de incontinencia fecal y el impacto en la calidad de vida de los pacientes geriátricos hospitalizados en una muestra de un hospital de segundo nivel de Monterrey, Nuevo León, México. Material y métodos: Se interrogó a los pacientes mayores de 60 años hospitalizados o sus cuidadores acerca de incontinencia fecal. A los que respondieran afirmativamente y pudieran responder se les realizaron los siguientes cuestionarios y escalas: Minimental, calidad de vida de Rockwood para incontinencia fecal y escala de Wexner modificada para severidad de incontinencia; además de datos clínicos. Se calculó la frecuencia en base a una muestra y se determinaron asociaciones entre grado de incontinencia y calidad de vida. Resultados: Se interrogaron un total de 234 pacientes, de los cuales 135 (57,69%) eran mujeres y 99 (42,31%) hombres. Se documentó un total de 34 pacientes con incontinencia fecal, esto representa una frecuencia de 14,53% (IC95%, 10,2819,71%) en esta población. Se encontró una correlación positiva de la severidad de la incontinencia con la dimensión de estilo de vida (relación (r) = -0,61, p=0,04), vergüenza (r=-0,70, p=0,01), conducta (r=-0,73, p=0,001) y el promedio de las cuatro dimensiones (r=-0,67, p=0,02) pero no con la dimensión de depresión del cuestionario de calidad de vida en incontinencia fecal. Conclusión: Al comparar con otros estudios nacionales e internacionales, la frecuencia de incontinencia fecal encontrada es menor a lo documentado en otras series. La calidad de vida de los pacientes ancianos hospitalizados con incontinencia fecal en esta muestra se encuentra disminuida y su impacto en la calidad de vida se correlaciona con la severidad de la incontinencia fecal.
Objective: To determine the frequency of fecal incontinence and the impact on the quality of life of hospitalized geriatric patients in a sample from a level two hospital in Monterrey, Nuevo Leon, Mexico. Materials and methods: Hospitalized patients over 60 years of age or their caregivers were questioned about the presence of fecal incontinence. Those who responded affirmatively and could respond were given the following questionnaires and scales: Mini-Mental, Rockwood quality of life for fecal incontinence and Wexner scale modified for severity of incontinence; in addition to clinical data. The frequency was calculated based on a sample and associations were determined between degree of incontinence and quality of life. Results: A total of 234 patients were questioned, of whom 135 (57.69%) were women and 99 (42.31%) men. A total of 34 patients with fecal incontinence were documented, this represents a frequency of 14.53% (95% CI, 10.28-19.71%) in this population. A positive correlation of the severity of incontinence was found with the lifestyle dimension (relation (r) = -0.61, p = 0.04), shame (r = -0.70, p = 0.01), behavior (r = -0.73, p = 0.001) and the average of the four dimensions (r = -0.67, p = 0.02) but not with the depression dimension of the quality of life questionnaire in fecal incontinence. Conclusion: When compared with other national and international studies, the frequency of fecal incontinence found was lower than that documented in other series. The quality of life of hospitalized elderly patients with fecal incontinence in this sample was diminished and its impact on quality of life correlated with the severity of fecal incontinence.
Assuntos
Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Qualidade de Vida , Incontinência Fecal/epidemiologia , Hospitalização , Índice de Gravidade de Doença , Incontinência Fecal/diagnóstico , México/epidemiologiaRESUMO
INTRODUCTION: There is a high rate of deliveries in adolescents in Mexico. This age group is vulnerable to obstetric complications, including lacerations of the anal sphincter. OBJECTIVE: To determine the prevalence of third and fourth degree perineal tears in adolescents during childbirth, and to evaluate risk factors in comparison with deliveries with lacerations of adult women. METHODS: All obstetric care episodes were reviewed from a public tertiary hospital data in Monterrey, Mexico in 2014. Age, primiparity, delivery instrumentation, episiotomy, body mass index, product weight and tear´s degree were documented at the deliveries with tears of third and fourth degree. RESULTS: The prevalence of third and fourth degree tears of 2.0% was found in the general population, being adolescents the most affected with 2.5%. The unadjusted odds ratio of high-grade tears in adolescent females at delivery, compared to adult females, was 1.36 (95% CI = 0.99-1.86, p= 0.05). No difference was found when comparing risk factors among high-grade tear deliveries in adolescents versus adults. CONCLUSIONS: A higher prevalence than previous reported for high grade tears during delivery was found. The data suggest adolescence as a risk factor for high-grade tears during delivery.
INTRODUCCIÓN: En México hay una elevada tasa de partos en adolescentes. Este grupo es vulnerable para complicaciones obstétricas, entre ellas laceración del esfínter anal. OBJETIVO: Conocer la prevalencia de desgarros perineales de tercer y cuarto grado en adolescentes durante el parto y evaluar factores de riesgo en comparación con partos con laceración de mujeres adultas. MÉTODOS: Se revisaron todas las atenciones obstétricas en un hospital publico de tercer nivel en Monterrey, Nuevo León, México en el año 2014. Se documentó edad, primiparidad, instrumentación del parto, realización de episiotomía, índice de masa corporal, peso del producto y grado del desgarro en los partos que presentaron desgarros de tercer y cuarto grado. RESULTADOS: Se encontró una prevalencia general de 2.0% de desgarros de tercer y cuarto grado y en adolescentes de 2.5%. La razón de momios sin ajustar de desgarros de alto grado en mujeres adolescentes en comparación con mujeres adultas fue de 1.36 (IC 95%= 0.99-1.86, p= 0.05). No se encontró diferencia al comparar factores de riesgo entre los partos con desgarro de alto grado en adolescentes contra adultas. CONCLUSIONES: Se encontró una prevalencia mayor a lo reportado de desgarros de alto grado durante el parto. Los datos sugieren a la adolescencia como factor de riesgo para desgarros de alto grado.
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Canal Anal/lesões , Lacerações/epidemiologia , Complicações do Trabalho de Parto/epidemiologia , Períneo/lesões , Adolescente , Adulto , Episiotomia/estatística & dados numéricos , Feminino , Humanos , Trabalho de Parto , Lacerações/etiologia , México/epidemiologia , Gravidez , Gravidez na Adolescência , Prevalência , Fatores de Risco , Adulto JovemRESUMO
The occurrence of chronic diseases such as neurological, metabolic and cardiovascular degenerative disorders increases with age. Cell therapy is an emerging approach to the treatment of these conditions. Of particular interest is the application of autologous stem cells because it eliminates post-transplantation immune rejection and there are less ethical concerns associated with their use. The regenerative capacity of stem cells harvested from elderly people is however controversial. In this review, we analyze if self-renewal potential, differentiation capability and expression of stemness genes in stem cells collected from elderly patients validate their application in clinical trials and examine the results.
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Doenças Cardiovasculares/terapia , Terapia Baseada em Transplante de Células e Tecidos , Regeneração/fisiologia , Transplante de Células-Tronco , Células-Tronco/citologia , Transplante Autólogo , Idoso , Humanos , Medicina RegenerativaRESUMO
There is a need for new noninvasive biomarkers (NIBMs) able to assess cholestasis and fibrosis in chronic cholestatic liver diseases (CCLDs). Tumorigenesis can arise from CCLDs. Therefore, autoantibodies to tumor-associated antigens (TAA) may be early produced in response to abnormal self-antigen expression caused by cholestatic injury. Vascular endothelial growth factor receptor-3 (VEGFR-3) has TAA potential since it is involved in cholangiocytes and lymphatic vessels proliferations during CCLDs. This study aims to detect autoantibodies directed at VEGFR-3 during bile duct ligation- (BDL-) induced cholestatic injury in rat sera and investigate whether they could be associated with traditional markers of liver damage, cholestasis, and fibrosis. An ELISA was performed to detect anti-VEGFR-3 autoantibodies in sera of rats with different degree of liver injury and results were correlated with aminotransferases, total bilirubin, and the relative fibrotic area. Mean absorbances of anti-VEGFR-3 autoantibodies were significantly increased from week one to week five after BDL. The highest correlation was observed with total bilirubin (R (2) = 0.8450, P = 3.04e - 12). In conclusion, anti-VEGFR-3 autoantibodies are early produced during BDL-induced cholestatic injury, and they are closely related to cholestasis, suggesting the potential of anti-VEGFR-3 autoantibodies as NIBMs of cholestasis in CCLDs and justifying the need for further investigations in patients with CCLD.
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Autoanticorpos/metabolismo , Bilirrubina/metabolismo , Colestase/imunologia , Hepatopatias/imunologia , Receptor Tipo 3 de Fator de Crescimento de Fibroblastos/imunologia , Animais , Antígenos de Neoplasias/metabolismo , Modelos Animais de Doenças , Humanos , Masculino , Ratos , Ratos WistarRESUMO
There is a current need to develop low-cost strategies to degrade and eliminate industrially used colorants discharged into the environment. Colorants discharged into natural water streams pose various threats, including: toxicity, degradation of aesthetics and inhibiting sunlight penetration into aquatic ecosystems. Dyes and colorants usually have complex aromatic molecular structures, which make them very stable and difficult to degrade and eliminate by conventional water treatment systems. The results in this work demonstrated that heavy metal-resistant Rhodotorula mucilaginosa strain UANL-001L isolated from the northeast region of Mexico produce an exopolysaccharide (EPS), during growth, which has colorant adsorption potential. The EPS produced was purified by precipitation and dialysis and was then physically and chemically characterized by Scanning Electron Microscopy, Fourier Transform Infrared Spectroscopy, and chemical elemental analysis. Here, the ability of the purified EPS produced to adsorb methylene blue (MB), which served as a model colorant, is studied. MB adsorption by the EPS is found to follow Langmuir Adsorption Isotherm kinetics at 25°C. Further, by calculating the Langmuir constant the adsorption capabilities of the EPS produced by the Rhodotorula mucilaginosa strain UANL-001L is compared to that of other adsorbents, both, microbially produced and from agroindustrial waste. The total adsorption capacity of the EPS, from the Rhodotorula mucilaginosa strain UANL-001L, was found to be two-fold greater than the best bioadsorbents reported in the literature. Finally, apart from determining which heavy metals stimulated EPS production in the strain, the optimal conditions of pH, heavy metal concentration, and rate of agitation of the growing culture for EPS production, was determined. The EPS reported here has the potential of aiding in the efficient removal of colorants both in water treatment plants and in situ in natural water streams.
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Biomassa , Metais/farmacologia , Polissacarídeos/metabolismo , Rhodotorula/metabolismo , Adsorção , Aerobiose , Concentração de Íons de Hidrogênio , Cinética , México , Testes de Sensibilidade Microbiana , Rhodotorula/isolamento & purificaçãoRESUMO
Inflammation is a central feature of liver fibrosis as suggested by its role in the activation of hepatic stellate cells leading to extracellular matrix deposition. During liver injury, inflammatory cells are recruited in the injurious site through chemokines attraction. Thus, inflammation could be a target to reduce liver fibrosis. The pandemic trend of obesity, combined with the high incidence of alcohol intake and viral hepatitis infections, highlights the urgent need to find accessible antifibrotic therapies. Medicinal plants are achieving popularity as antifibrotic agents, supported by their safety, cost-effectiveness, and versatility. The aim of this review is to describe the role of inflammation and the immune response in the pathogenesis of liver fibrosis and detail the mechanisms of inhibition of both events by medicinal plants in order to reduce liver fibrosis.
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Following chronic liver injury, hepatocytes undergo apoptosis leading to activation of hepatic stellate cells (HSC). Consequently, activated HSC proliferate and produce excessive extracellular matrix, responsible for the scar formation. The pandemic trend of obesity, combined with the high incidence of alcohol intake and viral hepatitis infections, highlights the urgent need to find accessible antifibrotic therapies. Treatment strategies should take into account the versatility of its pathogenesis and act on all the cell lines involved to reduce liver fibrosis. Medicinal plants are achieving popularity as antifibrotic agents, supported by their safety, cost-effectiveness, and versatility. This review will describe the role of hepatocytes and HSC in the pathogenesis of liver fibrosis and detail the mechanisms of modulation of apoptosis of both cell lines by twelve known hepatoprotective plants in order to reduce liver fibrosis.
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Adipose-derived stem cells (ADSCs) are a heterogeneous cell population that may be enriched by positive selection with antibodies against the low-affinity nerve growth factor receptor (LNGFR or CD271), yielding a selective cell universe with higher proliferation and differentiation potential. This paper addresses the need for determining the quantity of ADSCs positive for the CD271 receptor and its correlation with donor's age. Mononuclear cells were harvested from the lower backs of 35 female donors and purified using magnetic beads. Multipotency capacity was tested by the expression of stemness genes and through differentiation into preosteoblasts and adipocytes. A significant statistical difference was found in CD271(+) concentrations between defined age intervals. The highest yield was found within women on the 30-40-year-old age range. CD271(+) ADSCs from all age groups showed differentiation capabilities as well as expression of typical multipotent stem cell genes. Our data suggest that the amount of CD271(+) cells correlates inversely with age. However, the ability to obtain these cells was maintained through all age ranges with a yield higher than what has been reported from bone marrow. Our findings propose CD271(+) ADSCs as the primary choice for tissue regeneration and autologous stem cell therapies in older subjects.
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Improvements in quality of life and life expectancy have been observed in amyotrophic lateral sclerosis (ALS) patients transplanted with CD133(+) stem cells into their frontal motor cortices. However, questions have emerged about the capacity of cells from these patients to engraft and differentiate into neurons. The objective of this work was to evaluate the in vitro capacity of CD133(+) stem cells from 13 ALS patients to differentiate into neuron lineage. Stem cells were obtained through leukapheresis and cultured in a control medium or a neuroinduction medium for 2-48 hours. Expression of neuronal genes was analyzed by reverse transcription polymerase chain reaction (RT-PCR) and immunohistochemical techniques. Fluorescence microscopy demonstrated that CD133(+) stem cells from ALS patients incubated for 48 hours in a neuroinduction medium increased the detection of neuronal proteins such as nestin, ß-tubulin III, neuronal-specific enolase, and glial fibrillary acidic protein. RT-PCR assays demonstrated an increase in the expression of ß-tubulin III, nestin, Olig2, Islet-1, Hb9, and Nkx6.1. No correlation was found between age, sex, or ALS functional scale and the CD133(+) stem cell response to the neuroinduction medium. We conclude that CD133(+) stem cells from ALS patients, like the stem cells of healthy subjects, are capable of differentiating into preneuron cells.
Assuntos
Células-Tronco Adultas/citologia , Esclerose Lateral Amiotrófica/patologia , Antígenos CD/metabolismo , Glicoproteínas/metabolismo , Células-Tronco Neurais/citologia , Peptídeos/metabolismo , Antígeno AC133 , Adulto , Células-Tronco Adultas/metabolismo , Idoso , Fatores de Transcrição Hélice-Alça-Hélice Básicos/genética , Biomarcadores/metabolismo , Diferenciação Celular/fisiologia , Linhagem da Célula/fisiologia , Feminino , Expressão Gênica/fisiologia , Humanos , Técnicas In Vitro , Proteínas de Filamentos Intermediários/genética , Leucaférese , Masculino , Pessoa de Meia-Idade , Proteínas do Tecido Nervoso/genética , Nestina , Células-Tronco Neurais/metabolismo , Fator de Transcrição 2 de OligodendrócitosRESUMO
Amyotrophic lateral sclerosis is characterized by the selective death of motor neurons. Stem cells have been proposed as a potential therapeutic strategy. The safety of stem cell transplantation into the frontal motor cortex to improve upper motor neuron function is described. Sixty-seven patients with definite amyotrophic lateral sclerosis were included. After giving their informed consent, the patients underwent magnetic resonance imaging, functional rating, pulmonary function test, and laboratory tests. Their bone marrow was stimulated with daily filgrastim (300 µg) given subcutaneously for 3 days. Peripheral blood mononuclear cells were obtained by leukapheresis. Isolated CD133(+) stem cells were suspended in 300 µl of the patient's cerebrospinal fluid and implanted into the motor cortex. Adverse events were recorded at each step of the procedure and were classified according to the Common Terminology Criteria for Adverse Events v3.0. The survival at 1 year was 90% after transplantation. with a mean long-term survival rate of 40.17 months from diagnosis. The most common adverse events were in grades I-II and involved transient skin pain (19.5% of patients) attributed to the insertion of the Mahurkar catheter into the subclavian vein, minor scalp pain (15.9%), and headache (12.2%) from the surgical procedure. Several patients (1.5 - 4.5%) reported diverse grade I adverse events. There were two deaths, one considered to be associated with the procedure (1.5%) and the other associated with the disease. Autologous stem cell transplantation into the frontal motor cortex is safe and tolerated well by patients. Further controlled studies are required to define the efficacy of this procedure.
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Esclerose Lateral Amiotrófica/cirurgia , Transplante de Células-Tronco Mesenquimais/métodos , Esclerose Lateral Amiotrófica/sangue , Esclerose Lateral Amiotrófica/líquido cefalorraquidiano , Estudos de Viabilidade , Feminino , Filgrastim , Fator Estimulador de Colônias de Granulócitos/administração & dosagem , Humanos , Leucaférese/métodos , Masculino , Pessoa de Meia-Idade , Córtex Motor/cirurgia , Proteínas Recombinantes/administração & dosagemRESUMO
The demography, survival, and motor phenotypes of amyotrophic lateral sclerosis (ALS) patients have been rarely described in Hispanic countries. The clinical characteristics and survival of a series of Mexican ALS patients are described. Mexican patients with definite ALS were included in a five-year retrospective longitudinal study. Their demographic and clinical features, cumulative survival rates, and independent predictive factors for survival were analysed. Sixty-one definite ALS patients were included. The median follow-up period was 35 months (range 12-108 months). Males were predominant (1.8: 1), the mean age at onset was 47.5 ± 10.5 years, and the median interval from onset to diagnosis was 12 months. Spinal onset occurred in 66% of patients. Upper motor neuron phenotype was predominant in 53% of patients. The overall mean survival from onset was 68.6 months, and from diagnosis was 57.8 months. Longer survival was determined in patients aged ≤ 40 years (54.7 months) compared with other age groups (p = 0.006). In conclusion, the clinical heterogeneity, male predominance, and survival rates in our sample are consistent with those of other studies. Patients in this series had a younger age at onset and a clear trend toward longer survival compared with those of other population studies.
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Esclerose Lateral Amiotrófica/etnologia , Esclerose Lateral Amiotrófica/mortalidade , Esclerose Lateral Amiotrófica/fisiopatologia , Hispânico ou Latino , Adulto , Esclerose Lateral Amiotrófica/epidemiologia , Diagnóstico Diferencial , Feminino , Humanos , Masculino , México/epidemiologia , Pessoa de Meia-Idade , Prognóstico , Taxa de SobrevidaRESUMO
Background. Several factors inhibit cellular immune response by deactivating macrophages, but very few, such as those described here, prevent macrophage activation. Methods. Ascites liquid from 12-day-old BALB/c mice bearing 5178Y lymphoma tumors was collected, and cell-free ascites liquid (CFAL) was separated from lymphoblasts. The supernatant (SI) was obtained from the homogenized and centrifuged lymphoblasts Then, macrophage cultures contaning 0.2 X 10 a the sixth cells from lymphoma-bearing or hearthly mice were added to 10 µL of CFAL or S1, plus 5 µg of lipopolysaccharides (LPS)/mL, 40 U interferon-ç or a blend of both. Macrophages were incubated with CFAL or S1 prior to or after adding the activators to investigate whether any of the previously mentioned lymphoma fraction inhibited macrophage activation or whether they deactivated them. The effect of CFAL or S1 was estimated as the diminution of the amount of nitric ixide released by the experimental macrophage cultures with respect to controls (activated macrophages treated with none of the lymphoma fractions). Results. LPS, IFN-ç, and the LPS/ç blend activated macrophages from both lymphomabearing and healthy mice. None of the lymphoma fractions deactivated macrophages. CFAL, but not S1, inhibited the macrophage activation, i.e., the percentage of inhibition of nitric oxide releasing 76.7 percent in macrophages from healthy and lymphomabearing mice, respectively. In addition, CFAL was unable to inhibit macrophage-activation effect of IFN-ç or the LPS/IFN-ç blend. Conclusions. Mouse L5178Y Lymphoma releases a factor that in vitro inhibits the macrophage activation induced by LPS, but not by IFN-ç controls
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Animais , Masculino , Camundongos , Ativação de Macrófagos/imunologia , Linfoma/imunologia , Macrófagos/imunologia , Interferon-alfa/farmacologia , Lipopolissacarídeos/farmacologia , Macrófagos/citologia , Macrófagos , Camundongos Endogâmicos BALB C , Camundongos Endogâmicos DBA , Mitógenos/farmacologiaRESUMO
PEHPS medium, developed for zxenic cultivation of Entamoeba histolytica and E. invadens, was also capable of supporting the growth of a Trichomonas vaginalis strain, with an inoculum of 1 to 100 trichomonads/ml. The lorithmic growth phase in PEHPS or in TYI-S-33 medium lasted 72 h; yield (3.33 ñ 0.56 x 10 a the 6 trichomonads/ml), duplication time (4.27 h), number of duplications (16.85), or increase ratio (33,328) in PEHPS medium showed no significant differences with those obtained in TYI-S33 under similar culture conditions. Accordingly, PEHPS medium might be used for the axenic cultivation of T. vaginalis
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Entamoeba histolytica/crescimento & desenvolvimento , Entamoeba/crescimento & desenvolvimento , Técnicas In Vitro , Trichomonas vaginalis/crescimento & desenvolvimento , Vida Livre de Germes/imunologiaRESUMO
Gossypol, a natural racemic mixture with action on NADP- and NAD-oxidoreductases from diverse species, has been proposed as a possible antiamebic medication considering several of its pharmacological properties. In this study it was found that malic enzyme and alcohol dehydrogenase from Entamoeba histolytica are strongly inhibited by (ñ)-gossypol, and both (+)- and (-)- enantiomers. The inhibition was of the noncompetitive type among their respective substrates in all cases. The (ñ)-, (+)-, (-)-gossypol half-maximal inhibitory concentrations (IC 50) for the malic enzyme were 3.71, 13.37 and 1.03 µM, and againts the alcohol dehydrogenase 79.64, 124.43 and 42.56 µM, respectively. Therefore, the (-) enantiomer resulted 3.6 and 13.0 times more potent than the racemic mixture and (+)- gossypol, respectively, to inhibit the malic enzyme, and 1.9 times and 2.9 times more potent than the racemic mixture and (+)-gossypol, respectively, against the alcohol dehydrogenase. Accordingly, one possible mechanism of the antiamebic affect of gossypol could be the inhibition of vital NADP-dependent enzymes as those analyzed in this study
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Oxirredutases do Álcool/uso terapêutico , Entamoeba histolytica/patogenicidade , Gossipol/farmacologia , Malato Desidrogenase/biossínteseRESUMO
Se describe un método económico, sencillo y reproducible para obtener un extracto salubre de semillas de tres variedades de frijol común (Phaseolus vulgaris), con actividad mitogénica para linfócitos humanos, cuya potencia es dependiente de la dosis empleada y comparable a la de un producto comercial de importación y alto costo. Se realizaron 193 análisis citogenéticos durante un período de tres años. Con ello se confirmó la utilidad y confiabilidad del producto para uso clínico. La actividad mitogénica de los extractos de frijol, obtenidos mediante el método aqui descrito, es estable durante un año por lo menos, almacenado a -20-C, y cuando menos por cinco meses a 4-C