RESUMEN
This work has been aimed at studying the effect of red thyme oil (RTO, Thymus vulgaris L.) on the shelf-life and Penicillium decay of oranges during cold storage. RTO vapours significantly reduced (P ≤ 0.05) the percentage of infected wounds, the external growth area and the production of spores in inoculated orange fruit stored for 12 days at 7 °C in a polypropylene film selected for its appropriate permeability. Among the RTO compounds, p-cymene and thymol were the most abundant in packed boxes at the end of cold storage. The RTO vapours did not affect the main quality parameters of the oranges, or the taste and odour of the juice. The results have shown that an active packaging, using RTO vapours, could be employed, by the citrus industry, to extend the shelf-life of oranges for fresh market use and juice processing.
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Calidad de los Alimentos , Almacenamiento de Alimentos/métodos , Aceites Volátiles/farmacología , Penicillium/efectos de los fármacos , Thymus (Planta)/metabolismo , Antioxidantes/química , Citrus/química , Citrus/metabolismo , Citrus/microbiología , Frío , Jugos de Frutas y Vegetales/análisis , Cromatografía de Gases y Espectrometría de Masas , Concentración de Iones de Hidrógeno , Aceites Volátiles/análisis , Penicillium/fisiologíaRESUMEN
BACKGROUND: Nodular lesions have common clinical appearance but different prognoses. Differential diagnosis between melanoma (MM), basal cell carcinoma (BCC) and dermal naevus (DN) poses a challenge in clinical practice. Reflectance confocal microscopy (RCM) and optical coherence tomography (OCT) are promising non-invasive imaging techniques, potentially able to decrease redundant biopsies. RCM allows in vivo visualization of skin down to the papillary dermis at almost histological resolution, while OCT, particularly dynamic OCT (D-OCT), provides images deeper within the dermis and reveals the vascular pattern. OBJECTIVES: To identify correlating features observed with RCM and OCT associated with the different nodular lesion diagnoses. METHODS: We retrospectively assessed 68 nodular lesions (30 MM, 20 BCC and 18 DN) with RCM and subsequently OCT. At the end of the study, evaluations were matched with histopathological diagnosis and statistical analysis was performed. RESULTS: In MM, 57% (17/30) evidenced both cerebriform nests at RCM and icicle-shaped structures at OCT, with higher average Breslow index. In 80% of BCCs with basaloid islands at RCM, OCT showed ovoid structures. More than half of DN (56%) showed hyporeflective nests at OCT and either dense nests or dense and sparse nests at RCM. CONCLUSIONS: The combined use of RCM and OCT offers a better understanding of the morphological architecture of nodular lesions, correlating RCM parameters with OCT and vice versa, assisting in turn with early differential diagnosis of malignant and benign nodular lesions. The correlation between icicle-shaped structures and cerebriform nests in MM and their association with Breslow index requires future research.
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Carcinoma Basocelular/patología , Melanoma/patología , Microscopía Confocal , Nevo Intradérmico/patología , Neoplasias Cutáneas/patología , Tomografía de Coherencia Óptica , Carcinoma Basocelular/diagnóstico por imagen , Diagnóstico Diferencial , Humanos , Melanoma/diagnóstico por imagen , Nevo Intradérmico/diagnóstico por imagen , Estudios Retrospectivos , Neoplasias Cutáneas/diagnóstico por imagenRESUMEN
Volatile organic compounds, quality and sensory attributes of sweet cherry cv "Ferrovia", cold packaged in Air or in different modified atmospheres (Low-O2â¯=â¯1% O2/0.03% CO2; High-CO2â¯=â¯16% O2/20% CO2; Mixâ¯=â¯1% O2/20% CO2), were monitored until 21â¯days of conservation. Results showed that sweet cherry cv "Ferrovia" is sensitive to CO2 accumulation (over 20%) in low oxygen (about 1%) modified atmosphere, as showed by the increase in respiration rate, biosynthesis of fermentative volatile metabolites, and sensory perception of off-odours. However, High-CO2 treatment seemed to preserve quality and sensory traits, presumably due to the high initial concentration of O2 (16%) that could limit the synthesis of ethyl esters and γ-butyrolactone, keeping the accumulation of off-flavours below their sensory perception threshold. Finally, PLSR analysis allowed to select 1-pentanol as putative marker of sensory alteration and hexanal and 2-hexenal as possible predictors of freshness for "Ferrovia" sweet cherries.
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Almacenamiento de Alimentos/métodos , Prunus avium/química , Compuestos Orgánicos Volátiles/análisis , 4-Butirolactona/metabolismo , Dióxido de Carbono , Femenino , Embalaje de Alimentos , Humanos , Masculino , Odorantes , Oxígeno , Prunus avium/metabolismo , Gusto , Compuestos Orgánicos Volátiles/metabolismoAsunto(s)
Epidermólisis Ampollosa Distrófica/diagnóstico por imagen , Epidermólisis Ampollosa de la Unión/diagnóstico por imagen , Tomografía de Coherencia Óptica , Epidermólisis Ampollosa Distrófica/genética , Epidermólisis Ampollosa Distrófica/patología , Epidermólisis Ampollosa de la Unión/genética , Epidermólisis Ampollosa de la Unión/patología , Humanos , Estudios RetrospectivosAsunto(s)
Melanoma/patología , Neoplasias Cutáneas/patología , Dermoscopía , Femenino , Humanos , Extremidad Inferior , Masculino , Estudios RetrospectivosRESUMEN
BACKGROUND: Pigment network is an important dermoscopic feature for melanocytic lesions, but alterations in grid line thickness are also observed in melanomas. OBJECTIVE: To investigate features of thick, thin and mixed pigment networks at dermoscopy and their respective features at reflectance confocal microscopy (RCM) for differential diagnosis, correlated with histology. METHODS: All melanocytic lesions with histological diagnosis, evaluated between January 2010 and May 2014, were enrolled and classified according to dermoscopy evaluation of the pigment networks: thin, thick and mixed. RESULTS: Thin network in melanoma was characterized by a honeycombed pattern (P < 0.001), dendritic cells (P < 0.001), atypical ringed pattern (P = 0.035) and structureless area (P = 0.012), whereas round cells (P < 0.001), dendritic cells (P < 0.001) and atypical meshwork pattern (<0.001) characterized thick network in melanoma. Mixed network type in melanoma shared honeycombed (P = 0.049) and typical ringed patterns (P = 0.045) in the thin area and round cells (P < 0.001) and atypical meshwork pattern (P < 0.001) in the thick area. Thin network in nevi was characterized by cobblestone (P < 0.001) and typical ringed patterns (P = 0.035), whereas thick network in nevi showed a typical meshwork pattern (P < 0.001). Mixed nevi shared the same features and patterns, but more frequently with inflammatory infiltrate (P = 0.047). CONCLUSION: Differential diagnosis between melanocytic lesions (nevi or melanoma) in thin, thick and mixed pigment networks observed at dermoscopy can be assisted by RCM to improve diagnostic accuracy.
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Dermoscopía/métodos , Melanoma/diagnóstico , Microscopía Confocal/métodos , Pigmentos Biológicos/metabolismo , Neoplasias Cutáneas/diagnóstico , Diagnóstico Diferencial , Humanos , Melanoma/metabolismo , Melanoma/patología , Nevo/diagnóstico , Estudios Retrospectivos , Neoplasias Cutáneas/metabolismo , Neoplasias Cutáneas/patologíaRESUMEN
BACKGROUND: Reflectance confocal microscopy (RCM) is an imaging device that permits non-invasive visualization of cellular morphology and has been shown to improve diagnostic accuracy of dermoscopically equivocal cutaneous lesions. The application of double reader concordance evaluation of dermoscopy-RCM image sets in retrospective settings and its potential application to telemedicine evaluation has not been tested in a large study population. OBJECTIVE: To improve diagnostic sensitivity of RCM image diagnosis using a double reader concordance evaluation approach; to reduce mismanagement of equivocal cutaneous lesions in retrospective consultation and telemedicine settings. METHODS: 1000 combined dermoscopy-RCM image sets were evaluated in blind by 10 readers with advanced training and internship in dermoscopy and RCM evaluation. We compared sensitivity and specificity of single reader evaluation versus double reader concordance evaluation as well as the effect of diagnostic confidence on lesion management in a retrospective setting. RESULTS: Single reader evaluation resulted in an overall sensitivity of 95.2% and specificity of 76.3%, with misdiagnosis of 8 melanomas, 4 basal cell carcinomas and 2 squamous cell carcinomas. Combined double reader evaluation resulted in an overall sensitivity of 98.3% and specificity of 65.5%, with misdiagnosis of 1 in-situ melanoma and 2 basal cell carcinomas. CONCLUSION: Evaluation of dermoscopy-RCM image sets of cutaneous lesions by single reader evaluation in retrospective settings is limited by sensitivity levels that may result in potential mismanagement of malignant lesions. Double reader blind concordance evaluation may improve the sensitivity of diagnosis and management safety. The use of a second check can be implemented in telemedicine settings where expert consultation and second opinions may be required.
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Dermoscopía , Interpretación de Imagen Asistida por Computador , Microscopía Confocal , Neoplasias Cutáneas/diagnóstico , Telemedicina , Humanos , Estudios Retrospectivos , Sensibilidad y Especificidad , Neoplasias Cutáneas/diagnóstico por imagenRESUMEN
The Ufm1 conjugation system is a novel ubiquitin-like modification system, consisting of Ufm1, Uba5 (E1), Ufc1 (E2) and poorly characterized E3 ligase(s). RCAD/Ufl1 (also known as KIAA0776, NLBP and Maxer) was reported to function as a Ufm1 E3 ligase in ufmylation (Ufm1-mediated conjugation) of DDRGK1 and ASC1 proteins. It has also been implicated in estrogen receptor signaling, unfolded protein response (UPR) and neurodegeneration, yet its physiological function remains completely unknown. In this study, we report that RCAD/Ufl1 is essential for embryonic development, hematopoietic stem cell (HSC) survival and erythroid differentiation. Both germ-line and somatic deletion of RCAD/Ufl1 impaired hematopoietic development, resulting in severe anemia, cytopenia and ultimately animal death. Depletion of RCAD/Ufl1 caused elevated endoplasmic reticulum stress and evoked UPR in bone marrow cells. In addition, loss of RCAD/Ufl1 blocked autophagic degradation, increased mitochondrial mass and reactive oxygen species, and led to DNA damage response, p53 activation and enhanced cell death of HSCs. Collectively, our study provides the first genetic evidence for the indispensable role of RCAD/Ufl1 in murine hematopoiesis and development. The finding of RCAD/Ufl1 as a key regulator of cellular stress response sheds a light into the role of a novel protein network including RCAD/Ufl1 and its associated proteins in regulating cellular homeostasis.
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Hematopoyesis , Ubiquitina-Proteína Ligasas/metabolismo , Anemia/etiología , Animales , Autofagia , Células de la Médula Ósea/citología , Células de la Médula Ósea/metabolismo , Células Cultivadas , Estrés del Retículo Endoplásmico , Células HEK293 , Células Madre Hematopoyéticas/citología , Células Madre Hematopoyéticas/metabolismo , Humanos , Ratones , Ratones Endogámicos C57BL , Ratones Noqueados , Proteínas Asociadas a Microtúbulos/genética , Proteínas Asociadas a Microtúbulos/metabolismo , Mitocondrias/metabolismo , Células Madre Embrionarias de Ratones/citología , Células Madre Embrionarias de Ratones/metabolismo , Interferencia de ARN , Especies Reactivas de Oxígeno/metabolismo , Proteína p53 Supresora de Tumor/metabolismo , Ubiquitina-Proteína Ligasas/deficiencia , Ubiquitina-Proteína Ligasas/genética , Respuesta de Proteína DesplegadaRESUMEN
UNLABELLED: We studied factors to determine the receipt of osteoporosis treatment in individuals with osteoporosis. Treatment was associated with age, gender, race, body mass index (BMI), family history, arthritis and thyroid problems, daily glucocorticoid use, number of prescriptions and healthcare visits, and insurance type. INTRODUCTION: Osteoporosis is underrecognized and undertreated. Few studies have examined factors associated with osteoporosis treatment in a large, national sample of men and women. METHODS: We aggregated National Health and Nutrition Examination Survey (NHANES) data from 2005 to 2010 and created a subsample which included individuals 50 years or older who were identified to have osteoporosis either by self-report data or by bone density measurements. The primary outcome was the receipt of osteoporosis treatment either from self-report or from prescription records. Covariates included sociodemographics, clinical characteristics, and access to healthcare variables. Logistic regression analyses were performed to determine factors that associate with osteoporosis treatment. RESULTS: From a sample of 31,0134 participants, 1,133 subjects (3.65 %) met the study criteria. Treatment was associated with age (odds ratio (OR) = 1.14), gender (OR = 13.25), race (OR = 2.23, White vs. Black; OR = 1.76, other vs. Black), BMI (OR = 1.67, normal vs. obese; OR = 2.68, overweight vs. obese), family history of osteoporosis (OR = 1.94), arthritis (OR = 1.43), daily glucocorticoid use (OR = 1.43), number of prescriptions (OR = 1.01), and number of healthcare visits in the past year (OR = 1.44, 4-9 vs. 0-3 visits). All odds ratios were statistically significant. CONCLUSION: A large number of individuals diagnosed with osteoporosis above the age of 50 remain untreated. It is important for healthcare providers to better assess older adults with osteoporosis, including individuals who frequently receive medical care.
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Conservadores de la Densidad Ósea/uso terapéutico , Disparidades en Atención de Salud/estadística & datos numéricos , Osteoporosis/tratamiento farmacológico , Absorciometría de Fotón/métodos , Anciano , Anciano de 80 o más Años , Índice de Masa Corporal , Densidad Ósea/fisiología , Prescripciones de Medicamentos/estadística & datos numéricos , Utilización de Medicamentos/estadística & datos numéricos , Femenino , Humanos , Masculino , Persona de Mediana Edad , Encuestas Nutricionales , Osteoporosis/epidemiología , Osteoporosis/fisiopatología , Fracturas Osteoporóticas/epidemiología , Fracturas Osteoporóticas/prevención & control , Factores Socioeconómicos , Estados Unidos/epidemiologíaRESUMEN
OBJECTIVE: We examined whether deficiency of Src homology 2 containing phosphatase (Shp2) signaling in forebrain neurons alters metabolic and cardiovascular regulation under various conditions and if it attenuates the anorexic and cardiovascular effects of leptin. We also tested whether forebrain Shp2 deficiency alters blood pressure (BP) and heart rate (HR) responses to acute stress. DESIGN: Forebrain Shp2(-/-) mice were generated by crossing Shp2(flox/flox) mice with CamKIIα-cre mice. At 22-24 weeks of age, the mice were instrumented for telemetry for measurement of BP, HR and body temperature (BT). Oxygen consumption (VO2), energy expenditure and motor activity were monitored by indirect calorimetry. RESULTS: Shp2/CamKIIα-cre mice were heavier (46±3 vs 32±1 g), hyperglycemic, hyperleptinemic, hyperinsulinemic and hyperphagic compared to Shp2(flox/flox) control mice. Shp2/CamKIIα-cre mice exhibited reduced food intake responses to fasting/refeeding and impaired regulation of BT when exposed to 15 and 30 °C ambient temperatures. Despite being obese and having many features of metabolic syndrome, Shp2/CamKIIα-cre mice had similar daily average BP and HR compared to Shp2(flox/flox) mice (112±2 vs 113±1 mm Hg and 595±34 vs 650±40 b.p.m.), but exhibited increased BP and HR responses to cold exposure and acute air-jet stress test. Leptin's ability to reduce food intake and to raise BP were markedly attenuated in Shp2/CamKIIα-cre mice. CONCLUSION: These results suggest that forebrain Shp2 signaling regulates food intake, appetite responses to caloric deprivation and thermogenic control of body temperature during variations in ambient temperature. Deficiency of Shp2 signaling in the forebrain is associated with augmented cardiovascular responses to cold and acute stress but attenuated BP responses to leptin.
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Metabolismo Energético , Leptina/metabolismo , Prosencéfalo/patología , Proteína Tirosina Fosfatasa no Receptora Tipo 11/deficiencia , Receptores de Leptina/metabolismo , Animales , Presión Sanguínea , Temperatura Corporal , Calorimetría Indirecta , Ingestión de Alimentos , Frecuencia Cardíaca , Péptidos y Proteínas de Señalización Intracelular , Masculino , Ratones , Ratones Transgénicos , Neuronas , Obesidad , Consumo de Oxígeno , Transducción de SeñalRESUMEN
Fetal hemoglobin (HbF) induction is an effective approach to improve clinical symptoms in sickle cell disease. Understanding molecular mechanisms for gamma-gene re-activation will aid efforts to design lead compounds. A potential inhibitory role for the extracellular signal-regulated kinase (ERK) mitogen-activated protein kinase (MAPK) pathway in gamma-gene expression has been suggested recently. Therefore, we determined the ability of U0126, a selective inhibitor of MEK1/2 the upstream activators of ERK, to re-activate gamma-globin expression. K562 stable lines over-expressing constitutively active MEK1 were established. A significant increase in ERK phosphorylation was observed and gamma-gene expression was silenced concomitantly, however U0126 attenuated this effect. Studies in human erythroid progenitors confirmed the ability of U0126 to induce HbF. Cellular mechanisms for the inhibitory role of ERK signaling in drug-mediated HbF induction will be discussed.
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Butadienos/farmacología , Inhibidores Enzimáticos/farmacología , Células Precursoras Eritroides/metabolismo , Quinasas MAP Reguladas por Señal Extracelular/antagonistas & inhibidores , Regulación de la Expresión Génica/efectos de los fármacos , Globinas/biosíntesis , Nitrilos/farmacología , Transducción de Señal/efectos de los fármacos , Western Blotting , Muerte Celular/efectos de los fármacos , Proliferación Celular/efectos de los fármacos , Células Precursoras Eritroides/efectos de los fármacos , Quinasas MAP Reguladas por Señal Extracelular/metabolismo , Hemoglobina Fetal/biosíntesis , Hemoglobina Fetal/genética , Globinas/genética , Inhibidores de Histona Desacetilasas , Humanos , Células K562 , MAP Quinasa Quinasa 1/antagonistas & inhibidores , MAP Quinasa Quinasa 1/metabolismo , MAP Quinasa Quinasa 2/antagonistas & inhibidores , MAP Quinasa Quinasa 2/metabolismo , Fosforilación , ARN Mensajero/biosíntesis , ARN Mensajero/genética , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , Transducción de Señal/fisiologíaRESUMEN
Many different classes of drugs induce fetal hemoglobin (HbF) including histone deacetylase (HDAC) inhibitors such as butyrate and trichostatin A. Although these agents induce gamma-globin expression in culture many are ineffective in vivo, therefore research efforts continue to identify clinically useful fetal globin inducers. We and others demonstrated a role for p38 mitogen activated protein kinase (MAPK) in gamma-globin promoter activation by HDAC inhibitors. In this study we determined the ability of scriptaid, a novel HDAC inhibitor, to induce gamma-globin expression via p38 MAPK signaling. Scriptaid induced gamma-globin in K562 cells and human erythroid progenitors. Furthermore the p38-selective inhibitor SB203580 completely reversed the ability of scriptaid to induce HbF. To test the potential efficacy of scriptaid in humans, in vivo studies were completed in beta-YAC transgenic mice where the gamma-gene is completely silenced. Scriptaid induced reticulocytosis and human gamma-globin mRNA synthesis. At a concentration of 1 mg/kg/day given by intraperitoneal injections twice weekly we observed a significant 1.8-fold increase in gamma-globin mRNA transcripts. The potential for scriptaid as a treatment option for sickle cell disease will be discussed.
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Células Precursoras Eritroides/efectos de los fármacos , Hemoglobina Fetal/genética , Regulación de la Expresión Génica/efectos de los fármacos , Globinas/genética , Inhibidores de Histona Desacetilasas , Hidroxilaminas/farmacología , Quinolinas/farmacología , Anemia de Células Falciformes/tratamiento farmacológico , Animales , Butiratos/farmacología , Inhibidores Enzimáticos/farmacología , Células Precursoras Eritroides/química , Células Precursoras Eritroides/metabolismo , Hemoglobina Fetal/biosíntesis , Silenciador del Gen , Globinas/biosíntesis , Humanos , Ácidos Hidroxámicos/farmacología , Hidroxilaminas/uso terapéutico , Imidazoles/farmacología , Células K562 , Ratones , Ratones Transgénicos , Piridinas/farmacología , Quinolinas/uso terapéutico , ARN Mensajero/genética , ARN Mensajero/metabolismo , Transducción de Señal/efectos de los fármacos , Proteínas Quinasas p38 Activadas por Mitógenos/fisiologíaRESUMEN
Inhibition of beta-globin gene expression by antisense nucleic acids is a potentially powerful therapeutic strategy for sickle cell disease. To develop clinically relevant beta-globin antisense agents we created nine stable mouse erythroleukemia cell lines expressing unique anti-beta-globin RNA transcripts with different potentials for cross-hybridization with gamma-globin mRNA. We observed variable inhibition of beta-globin expression independent of the hybridization potential of the respective antisense beta-globin RNA transcript. Similarly, inhibition of gamma-globin expression by anti-beta transcripts varied widely in the nine stable cell lines. Three neighboring regions in the beta-globin gene with low RNA folding potentials conferred significantly stronger antisense effect toward beta-globin while sparing the homologous targets in gamma-globin. We have identified for the first time targets in the beta-globin gene for which the homologous regions in gamma-globin are relatively inaccessible to antisense attack. Our findings offer the prospect of using this approach to reduce the proportion of intracellular hemoglobin S. Gene therapy strategies which combine gamma-globin induction along with beta-globin inhibition using antisense vectors may yield more favorable anti-sickling effects longterm.
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Globinas/genética , ARN sin Sentido/genética , ARN sin Sentido/metabolismo , Transcripción Genética/genética , Animales , Línea Celular Tumoral , Regulación hacia Abajo , Globinas/biosíntesis , Humanos , Leucemia Eritroblástica Aguda/genética , Ratones , ARN Mensajero/genética , ARN Mensajero/metabolismo , Sensibilidad y Especificidad , Especificidad por Sustrato , TransfecciónRESUMEN
Pleomorphic adenoma of the breast is a rare, benign tumor accounting for 68 cases in the literature. It is most commonly seen in postmenopausal women and is characterized by an admixture of epithelial and myoepithelial cells embedded in abundant myxomatous stroma. Its clinical and histologic appearance can be challenging and may lead to a misdiagnosis of invasive carcinoma. We report a case of mammary pleomorphic adenoma in an asymptomatic 59-year-old woman and briefly discuss its distinction from mucinous carcinoma through the use of special stains.
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Adenoma Pleomórfico/diagnóstico , Neoplasias de la Mama/diagnóstico , Neoplasias de las Glándulas Sudoríparas/diagnóstico , Adenocarcinoma Mucinoso/diagnóstico , Diagnóstico Diferencial , Femenino , Humanos , Persona de Mediana EdadRESUMEN
Current chemotherapeutic and butyrate therapeutics that induce fetal hemoglobin expression generally also suppress erythropoiesis, limiting the production of cells containing fetal hemoglobin (F cells). Recently, selected short-chain fatty acid derivatives (SCFADs) were identified that induce endogenous gamma-globin expression in K562 cells and human burst-forming units-erythroid and that increase proliferation of human erythroid progenitors and a multilineage interleukin-3-dependent hematopoietic cell line. In this report, gamma-globin inducibility by these SCFADs was further demonstrated in mice transgenic for the locus control region and the entire beta-globin gene locus in a yeast artificial chromosome and in 2 globin promoter-reporter assays. Conditioned media experiments strongly suggest that their proliferative activity is a direct effect of the test compounds. Investigation of potential mechanisms of action of these SCFADs demonstrates that these compounds induce prolonged expression of the growth-promoting genes c-myb and c-myc. Both butyrate and specific growth-stimulatory SCFADs induced prolonged signal transducer and activator of transcription (STAT)-5 phosphorylation and activation, and c-cis expression, persisting for more than 120 minutes, whereas with IL-3 alone phosphorylation disappeared within minutes. In contrast to butyrate treatment, the growth-stimulating SCFADs did not result in bulk histone H4 hyperacetylation or induction of p21(Waf/Cip), which mediates the suppression of cellular growth by butyrate. These findings suggest that the absence of bulk histone hyperacetylation and p21 induction, but prolonged induction of cis, myb, myc, and STAT-5 activation, contribute to the cellular proliferation induced by selected SCFADs.
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División Celular/efectos de los fármacos , Proteínas de Unión al ADN/metabolismo , Ácidos Grasos Volátiles/farmacología , Proteínas de la Leche , Transactivadores/metabolismo , Animales , Butiratos/farmacología , Línea Celular , Inhibidor p21 de las Quinasas Dependientes de la Ciclina , Ciclinas , Globinas/biosíntesis , Globinas/genética , Sustancias de Crecimiento/farmacología , Histonas/metabolismo , Humanos , Proteínas Inmediatas-Precoces/biosíntesis , Interleucina-3/farmacología , Cinética , Ratones , Ratones Transgénicos , Fosforilación , Proteínas Proto-Oncogénicas c-myb/biosíntesis , Proteínas Proto-Oncogénicas c-myc/biosíntesis , Factor de Transcripción STAT5 , Proteínas Supresoras de la Señalización de CitocinasRESUMEN
The switch from embryonic to fetal then to adult hemoglobin synthesis is a unique phenomenon during early human development. Fetal hemoglobin (Hb F) is known to interfere with polymerization of Hb S in erythrocytes. Several pharmacologic agents such as 5-azacytidine, myleran, hydroxyurea, erthropoietin, and butyrates enhance fetal hemoglobin production and have been used in hemoglobinopathy patients to ameliorate severe pain episodes and reduce severe anemia. Among these, hydroxyurea is the agent of choice because of its safety and ease of administration. One of the primary cellular mechanisms involved in pharmacologic induction of Hb F synthesis is rapid regeneration of erythroid precursors following the cytoreduction phase of certain pharmacologic agents. Molecular mechanisms involving changes in chromatin structure and/or transcription factor binding have been demonstrated for gamma gene induction by butyrate. Identifying the proteins involved in gamma gene activation by various compounds may offer a new strategy for gene therapy to cure hemoglobinopathy disorders.