RESUMEN

The aim of the present study was to identify the relationship between the expression of calcitonin gene-related peptide (CGRP) and the responses of pulp sensitivity tests in healthy pulps and irreversible pulps by performing a cross-sectional study on patients. Two hundred subjects were evaluated. A total of 75 subjects complied with the criteria. The participants were divided into two groups: a) Healthy pulp (subjects [n = 35] having posterior teeth with clinically normal pulp tissue), and b) Irreversible pulpitis (subjects [n = 40] having posterior teeth with irreversible pulpitis). All participants were evaluated using the following variables: a) medical and dental history, b) pulp sensitivity tests, c) expression of CGRP by the enzyme-linked immunosorbent assay (ELISA), and d) expression levels of mRNA CGRP and mRNA CGRP receptor genes. We determined that the responses of the cold test between 4 and ≥12 s presented a higher average of the expression of CGRP in the group having irreversible pulpitis (p = 0.0001). When we compared the groups with the value of the electrical impulse, we found statistically significant differences (p = 0.0001), observing positive responses to the test with electrical impulses of 7 to 10, with an average of 72.15 ng/mL of CGRP in the irreversible pulpitis group. High values of CGRP expression were observed in that group in the responses of pulp sensitivity.

Asunto(s)

Péptido Relacionado con Gen de Calcitonina/análisis , Prueba de la Pulpa Dental/métodos , Pulpa Dental/patología , Pulpitis/patología , Adolescente , Adulto , Estudios de Casos y Controles , Estudios Transversales , Ensayo de Inmunoadsorción Enzimática , Femenino , Humanos , Masculino , Pulpitis/genética , Reacción en Cadena en Tiempo Real de la Polimerasa , Valores de Referencia , Estadísticas no Paramétricas , Factores de Tiempo , Adulto Joven

RESUMEN

INTRODUCTION: Sirtuins regulate energy metabolism and insulin sensitivity through their ability to act as energy sensors and regulators in several metabolic tissues. AIM: To evaluate the expression levels of sirtuin genes SIRT1, SIRT2, SIRT3 and SIRT6 and their target genes (PPAR-α, PGC1-α, NRF1, DGAT1, PPAR-γ and FOXO3a) in subcutaneous adipose tissue collected from individuals with normoweight, overweight and obesity. METHODS: Adipose tissue samples, obtained by lipoaspiration during liposuction surgery, were processed to obtain RNA, which was reverse-transcribed to cDNA. Then, we measured the expression levels of each gene by qPCR. RESULTS: We found differences in the mRNA expression of SIRT1, SIRT2, SIRT3 and SIRT6 and their target genes (PPAR-α, PGC1-α, NRF1, DGAT1, PPAR-γ and FOXO3a) in adipose tissue from overweight or obese subjects when compared to normoweight subjects. All genes analyzed, except SIRT2, showed correlation with BMI. CONCLUSIONS: Our findings in human subcutaneous adipose tissue show that increased body mass index modifies the expression of genes encoding sirtuins and their target genes, which are metabolic regulators of adipose tissue. Therefore, these could be used as biomarkers to predict the ability of adipose tissue to gain mass of adipose tissue.

Asunto(s)

Tejido Adiposo/fisiología , Obesidad/genética , Sirtuina 1/genética , Sirtuina 2/genética , Sirtuina 3/genética , Sirtuinas/genética , Adulto , Índice de Masa Corporal , Femenino , Humanos , Persona de Mediana Edad , Obesidad/diagnóstico , Obesidad/metabolismo , Sirtuina 1/biosíntesis , Sirtuina 2/biosíntesis , Sirtuina 3/biosíntesis , Sirtuinas/biosíntesis , Adulto Joven

RESUMEN

Abstract The aim of the present study was to identify the relationship between the expression of calcitonin gene-related peptide (CGRP) and the responses of pulp sensitivity tests in healthy pulps and irreversible pulps by performing a cross-sectional study on patients. Two hundred subjects were evaluated. A total of 75 subjects complied with the criteria. The participants were divided into two groups: a) Healthy pulp (subjects [n = 35] having posterior teeth with clinically normal pulp tissue), and b) Irreversible pulpitis (subjects [n = 40] having posterior teeth with irreversible pulpitis). All participants were evaluated using the following variables: a) medical and dental history, b) pulp sensitivity tests, c) expression of CGRP by the enzyme-linked immunosorbent assay (ELISA), and d) expression levels of mRNA CGRP and mRNA CGRP receptor genes. We determined that the responses of the cold test between 4 and ≥12 s presented a higher average of the expression of CGRP in the group having irreversible pulpitis (p = 0.0001). When we compared the groups with the value of the electrical impulse, we found statistically significant differences (p = 0.0001), observing positive responses to the test with electrical impulses of 7 to 10, with an average of 72.15 ng/mL of CGRP in the irreversible pulpitis group. High values of CGRP expression were observed in that group in the responses of pulp sensitivity.

Asunto(s)

Humanos , Masculino , Femenino , Adolescente , Adulto , Adulto Joven , Pulpitis/patología , Péptido Relacionado con Gen de Calcitonina/análisis , Pulpa Dental/patología , Prueba de la Pulpa Dental/métodos , Pulpitis/genética , Valores de Referencia , Factores de Tiempo , Ensayo de Inmunoadsorción Enzimática , Estudios de Casos y Controles , Estudios Transversales , Estadísticas no Paramétricas , Reacción en Cadena en Tiempo Real de la Polimerasa

RESUMEN

Acute lymphoblastic leukemia (ALL) is one of the main causes of death in children and is associated with both genetic susceptibility and environmental factors. Genes encoding the arylamine N-acetyltransferases 1 and 2 (NAT1 and NAT2) isoenzymes are highly polymorphic among populations. Single-nucleotide polymorphism analysis was performed by real-time polymerase chain reaction from the genomic DNA of 225 healthy subjects and 57 children with ALL diagnoses. Significant associations were found between the development of ALL and the presence of the haplotypes NAT1*3 (Odds ratio [OR], 2.1), NAT1*4 (OR, 1.92), NAT2*6B (OR, 3.30), NAT2*6J (OR, 3.25) and NAT2*7A (OR, 2.45) and the NAT1 rapid (OR, 6.69) and NAT2 slow phenotypes (OR, 2.95). Our results indicate that haplotypes that provide rapid NAT1 and slow NAT2 acetylating phenotypes may influence the development of ALL in children.

Asunto(s)

Arilamina N-Acetiltransferasa/genética , Predisposición Genética a la Enfermedad/genética , Isoenzimas/genética , Polimorfismo de Nucleótido Simple , Leucemia-Linfoma Linfoblástico de Células Precursoras/genética , Adolescente , Adulto , Anciano , Niño , Preescolar , Frecuencia de los Genes , Genotipo , Haplotipos , Humanos , Lactante , Persona de Mediana Edad , Adulto Joven

RESUMEN

SCOPE: The scope of this review is to explain how metabolic disorders originated by a deficient nutrition can develop into a neoplastic process by the alteration of epigenetic mechanisms like miRNAs. Obesity is a proinflammatory state with a wide impact on health around the world that is associated with neoplastic diseases. Epigenetic mechanisms have a central role in the obesogenic environment, which participates on the development of comorbidities such as cancer. METHODS AND RESULTS: We made an exhaustive review of the most recent reports about metabolic disorders with nutrition and their relationship with miRNAs, and their risk of developing into oncogenic processes. MicroRNAs (miRNAs) act as one of the major epigenetic mechanisms that can affect the metabolic reprogramming of cellular metabolism that plays an important role in the oncogenic process. There is evidence that some foods may contribute to diminishing the risk of cancer as well as epidemiological studies that support the notion that diets high in animal protein and fat promote cancer risk. Therefore, diets high in fruit and vegetables reduce the risk of cancer. One of the principal explanations is that these foods contain bioactive compounds that increase the efficacy of epigenetic mechanisms, which in turn decrease the risk of obesity and its comorbidities. CONCLUSION: In this review, we show how miRNAs are implicated in several signaling pathways as well as illustrating some bioactive compounds that impact inflammation and cancer development.

Asunto(s)

Desnutrición/complicaciones , Enfermedades Metabólicas/complicaciones , MicroARNs/fisiología , Neoplasias/etiología , Obesidad/complicaciones , Animales , Epigénesis Genética , Humanos , Microambiente Tumoral

RESUMEN

OBJECTIVES: The aim of this study was to identify regulatory T cell (Treg) subsets residing in adipose tissue, demonstrate their immunosuppressive functions, and assess the possible role of Sirt1 in their function in overweight subjects. METHODS: Fat samples were obtained by lipoaspiration from healthy overweight (n = 15) and normoweight (n = 11) subjects. We obtained the stromal vascular fraction and then isolated the mononuclear cells by Ficoll-Hypaque sedimentation. The Treg subsets were analyzed by flow cytometry, the expression of Sirt1 and Foxp3 was detected by western blot, and peroxisome proliferator-activated receptor gamma (PPAR-γ) expression was evaluated by qPCR. RESULTS: We detected low numbers of Treg cell subsets displaying the phenotypes CD4+CD25-Foxp3+, CD8+CD25-Foxp3+, and CD4+CD39+Foxp3+ associated with increased body mass index in overweight subjects. We found lower levels of mRNA SIRT1 expression in adipocytes from overweight subjects than in those from normoweight subjects. In contrast, increased amounts of the Sirt1 and Foxp3 proteins in adipose tissue mononuclear cells from overweight subjects were observed. The immunosuppressive function of CD4+CD25+ Treg cells is higher in cells from obese subject than in those from normoweight subject. CONCLUSIONS: Low levels of Treg subsets in overweight subjects with a high percentage of inhibition of proliferation could be related to high levels of the Foxp3 protein. Likewise, the low expression of SIRT1 and PPAR-γ mRNA levels and increased concentration of Sirt1 proteins allows adipose tissue mononuclear cells to respond to stimuli dependent on adenosine receptors and sirtuin pathways.

Asunto(s)

Tejido Adiposo/metabolismo , Factores de Transcripción Forkhead/metabolismo , Sobrepeso/metabolismo , Linfocitos T Reguladores/metabolismo , Adulto , Antígenos CD/metabolismo , Apirasa/metabolismo , Recuento de Linfocito CD4 , Linfocitos T CD8-positivos/metabolismo , Femenino , Citometría de Flujo , Factores de Transcripción Forkhead/genética , Humanos , Masculino , Sobrepeso/genética , PPAR gamma/genética , PPAR gamma/metabolismo , Sirtuina 1/genética , Sirtuina 1/metabolismo , Subgrupos de Linfocitos T/metabolismo

RESUMEN

The opportunistic fungal pathogen Candida glabrata adheres tightly to epithelial cells in culture, mainly through the adhesin Epa1. EPA1 is the founding member of a family of up to 23 putative adhesin-encoding genes present in the C. glabrata genome. The majority of the EPA genes are localized close to the telomeres, where they are repressed by subtelomeric silencing that depends on the Sir, Ku, Rif1, and Rap1 proteins. EPA6 and EPA7 also encode functional adhesins that are repressed in vitro. EPA1 expression in vitro is tightly controlled both positively and negatively, and in addition, presents high cell-to-cell heterogeneity, which depends on Sir-mediated silencing. In this work, we characterized the ability to adhere to HeLa epithelial cells and the expression of several EPA genes in a collection of 79 C. glabrata clinical isolates from several hospitals in Mexico. We found 11 isolates that showed increased adherence to mammalian cells compared with our reference strain under conditions where EPA1 is not expressed. The majority of these isolates displayed over-expression of EPA1 and EPA6 or EPA7, but did not show increased biofilm formation. Sequencing of the SIR3 gene of several hyper-adherent isolates revealed that all of them contain several polymorphisms with respect to the reference strain. Interestingly, two isolates have polymorphisms in positions flanked by clusters of amino acids required for silencing in the Saccharomyces cerevisiae Sir3 protein. Our data show that there is a large variability in adhesin expression and adherence to epithelial cells among different C. glabrata clinical isolates.

Asunto(s)

Candida glabrata/genética , Candidiasis/microbiología , Células Epiteliales/microbiología , Proteínas Fúngicas/genética , Expresión Génica , Polimorfismo Genético , Candida glabrata/aislamiento & purificación , Candida glabrata/fisiología , Adhesión Celular , ADN de Hongos/química , ADN de Hongos/genética , Proteínas Fúngicas/metabolismo , Células HeLa , Hospitales , Humanos , México , Datos de Secuencia Molecular , Análisis de Secuencia de ADN

RESUMEN

Candida glabrata, an opportunistic fungal pathogen, adheres to mammalian epithelial cells; adherence is mediated primarily by the Epa1 adhesin. EPA1 is a member of a large gene family of ≈ 23 paralogues, which encode putative adhesins. In this study, we address how EPA1 transcription is regulated. Our data show that EPA1 expression is subject to two distinct negative regulatory mechanisms. EPA1 transcription is repressed by subtelomeric silencing: the Sir complex (Sir2-Sir4), Rap1, Rif1, yKu70, and yKu80 are required for full repression. Activation of EPA1 occurs immediately after dilution of stationary phase (SP) cells into fresh media; however, transcription is rapidly repressed again, limiting expression to lag phase, just as the cells exit stationary phase. This repression following lag phase requires a cis-acting regulatory negative element (NE) located in the EPA1 3'-intergenic region and is independent of telomere proximity. Bioinformatic analysis shows that there are 10 copies of the NE-like sequence in the C. glabrata genome associated with other EPA genes as well as non-EPA genes.

Asunto(s)

Candida glabrata/genética , Proteínas Fúngicas/metabolismo , Regulación Fúngica de la Expresión Génica , Lectinas/metabolismo , Elementos Reguladores de la Transcripción , Candida glabrata/crecimiento & desarrollo , Candida glabrata/metabolismo , Adhesión Celular , División Celular , Células Cultivadas , Mapeo Cromosómico , Cromosomas Fúngicos/genética , Cromosomas Fúngicos/metabolismo , Medios de Cultivo/metabolismo , Proteínas de Unión al ADN/genética , Proteínas de Unión al ADN/metabolismo , Células Epiteliales/metabolismo , Células Epiteliales/microbiología , Proteínas Fúngicas/genética , Silenciador del Gen , Genes Fúngicos , Histona Desacetilasas/genética , Histona Desacetilasas/metabolismo , Humanos , Lectinas/genética , Técnicas Microbiológicas , Complejos Multiproteicos/genética , Complejos Multiproteicos/metabolismo , Proteínas Represoras/genética , Proteínas Represoras/metabolismo , Telómero/genética , Telómero/metabolismo , Transactivadores/genética , Transactivadores/metabolismo , Activación Transcripcional