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1.
Transpl Infect Dis ; : e14291, 2024 May 06.
Artículo en Inglés | MEDLINE | ID: mdl-38708965

RESUMEN

BACKGROUND: Valganciclovir prophylaxis against cytomegalovirus (CMV) is recommended for solid organ transplant recipients, but is associated with drawbacks, including expense and leukopenia. Our center adopted a strategy of serial assessment with a CMV-specific T cell immunity panel (CMV-TCIP) and cessation of valganciclovir prophylaxis upon demonstration of adequate CD4+ responses in kidney transplant patients at high risk of CMV disease. METHODS: We retrospectively reviewed adult recipients of a kidney or pancreas transplant between August 2019 and July 2021 undergoing serial CMV-TCIP monitoring. Included patients were considered high risk for CMV, defined by donor positive (D+)/recipient negative (R-) CMV IgG serostatus, or recipient positive (R+) patients who received induction with a lymphocyte-depleting agent. Prophylaxis was discontinued after a patient's first CMV-specific CD4+ T cell value of ≥0.20%. Risk of clinically significant CMV infection (csCMVi) in those who underwent early discontinuation of CMV prophylaxis and predictors of CMV T cell immunity were analyzed. RESULTS: Of 54 included patients, 22 stopped prophylaxis early due to CMV-specific CD4+ T cell immunity at a median of 4.7 (IQR: 3.8-5.4) months after transplant. No instances of csCMVi were observed in the 22 patients who had prophylaxis discontinued early, of whom 19/22 were CMV R+ and 3/22 were CMV D+/R-. Donor/recipient CMV serostatus was predictive of immunity (p <.001). CONCLUSION: Early discontinuation of valganciclovir prophylaxis in patients with CMV CD4+ T cellular immunity appears safe and potentially beneficial in this preliminary series, especially in R+ patients. Further study is warranted, given that truncated prophylaxis may yield patient-level benefits.

2.
Exp Mol Med ; 49(12): e413, 2017 12 15.
Artículo en Inglés | MEDLINE | ID: mdl-29244788

RESUMEN

The hepatic lobule is divided into three zones along the portal-central vein axis. Hepatocytes within each zone exhibit a distinctive gene expression profile that coordinates their metabolic compartmentalization. The zone-dependent heterogeneity of hepatocytes has been hypothesized to result from the differential degree of exposure to oxygen, nutrition and gut-derived toxins. In addition, the gradient of Wnt signaling that increases towards the central vein seen in rodent models is believed to play a critical role in shaping zonation. Furthermore, hepatic zonation is coupled to the site of the homeostatic renewal of hepatocytes. Despite its critical role, the regulatory mechanisms that determine the distinctive features of zonation and its relevance to humans are not well understood. The present study first conducted a comprehensive zone-dependent transcriptome analysis of normal human liver using laser capture microdissection. Upstream pathway analysis revealed the signatures of host responses to gut-derived toxins in the periportal zone, while both the canonical Wnt pathway and the xenobiotic response pathway govern the perivenular zone. Furthermore, we found that the hypoxic environment of the perivenular zone promotes Wnt11 expression in hepatocytes, which then regulates unique gene expression via activation of the non-canonical Wnt pathway. In summary, our study reports the comprehensive zonation-dependent transcriptome of the normal human liver. Our analysis revealed that the LPS response pathway shapes the characteristics of periportal hepatocytes. By contrast, the perivenular zone is regulated by a combination of three distinct pathways: the xenobiotic response pathway, canonical Wnt signaling, and hypoxia-induced noncanonical Wnt signaling.


Asunto(s)
Hígado/citología , Vena Porta/citología , Transcriptoma/genética , Proteínas Wnt/genética , Hipoxia de la Célula/genética , Línea Celular , Perfilación de la Expresión Génica , Regulación del Desarrollo de la Expresión Génica/genética , Hepatocitos/metabolismo , Humanos , Hígado/crecimiento & desarrollo , Vena Porta/crecimiento & desarrollo , Vena Porta/metabolismo , Vía de Señalización Wnt/genética , Xenobióticos/metabolismo , beta Catenina/metabolismo
3.
PLoS One ; 10(7): e0130909, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-26132201

RESUMEN

BACKGROUND: The molecular biology and cellular origins of mixed type endometrial carcinomas (MT-ECs) are poorly understood, and a Type II component of 10 percent or less may confer poorer prognoses. METHODOLOGY/PRINCIPAL FINDINGS: We studied 10 cases of MT-EC (containing endometrioid and serous differentiation), 5 pure low-grade endometrioid adenocarcinoma (EAC) and 5 pure uterine serous carcinoma (USC). Endometrioid and serous components of the MT-ECs were macrodissected and the expression of 60 candidate genes compared between MT-EC, pure USC and pure EAC. We found that four genes were differentially expressed when MT-ECs were compared to pure low-grade EAC: CDKN2A (P = 0.006), H19 (P = 0.010), HOMER2 (P = 0.009) and TNNT1 (P = 0.006). Also while we found that even though MT-ECs closely resembled the molecular profiles of pure USCs, they also exhibit lower expression of PAX8 compared to all pure cases combined (P = 0.035). CONCLUSION: Our data suggest that MT-EC exhibits the closest molecular and epidemiological similarities to pure USC and supports clinical observations that suggest patients with MT-EC should receive the same treatment as patients with pure serous carcinoma. Novel specific markers of MT-EC could be of diagnostic utility and could represent novel therapeutic targets in the future.


Asunto(s)
Biomarcadores de Tumor/metabolismo , Carcinoma Endometrioide/metabolismo , Neoplasias Endometriales/metabolismo , Adulto , Anciano , Biomarcadores de Tumor/genética , Carcinoma Endometrioide/genética , Carcinoma Endometrioide/patología , Proteínas Portadoras/genética , Proteínas Portadoras/metabolismo , Inhibidor p16 de la Quinasa Dependiente de Ciclina/genética , Inhibidor p16 de la Quinasa Dependiente de Ciclina/metabolismo , Neoplasias Endometriales/genética , Neoplasias Endometriales/patología , Femenino , Proteínas de Andamiaje Homer , Humanos , Persona de Mediana Edad , Factor de Transcripción PAX8 , Factores de Transcripción Paired Box/genética , Factores de Transcripción Paired Box/metabolismo , ARN Largo no Codificante/genética , Membrana Serosa/patología , Troponina/genética , Troponina/metabolismo
4.
J Clin Pathol ; 68(9): 710-7, 2015 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-25991737

RESUMEN

AIMS: To evaluate an immunohistochemical panel differentiating endometrial stromal sarcoma (ESS) from uterine leiomyosarcoma (ULMS) and leiomyoma (LM). METHODS: 94 cases (28 ESS, 41 ULMS, 25 LM) were retrieved and arrayed. 10 immunomarkers (estrogen receptor (ER), progesterone receptor (PR), CD10, smooth muscle actin, desmin, h-caldesmon, transgelin, GEM, ASC1, stathmin1) were used. A predictive model was constructed and examined by receiver operating characteristics curve analysis to determine area under the curve (AUC). RESULTS: The combination of ER(+)/PR(+)/CD10(+)/GEM(-)/h-caldesmon(-)/transgelin(-) can predict ESS versus ULMS with AUC predictive value of 0.872 (95% CI 0.784 to 0.961, p<0.0001). The combination of ER(+)/PR(+)/CD10(+)/h-caldesmon(-)/transgelin(-) can predict low grade (LG) ESS from 'LG' ULMS with AUC predictive value of 0.914 (95% CI 0.832 to 0.995, p<0.0001). Finally, ULMS and ESS, including the LGs, were more likely to be stathmin1(+) than LM. CONCLUSIONS: Due to the different clinical course and management, adding novel antibodies (GEM, transgelin) to the well established immunohistochemistry panel seemed to be useful in distinguishing ESS from ULMS and LG ESS from 'LG' ULMS. Finally, stathmin1 expression could be of value in differentiating LM from uterine sarcomas.


Asunto(s)
Biomarcadores de Tumor/análisis , Neoplasias Endometriales/diagnóstico , Leiomioma/diagnóstico , Leiomiosarcoma/diagnóstico , Sarcoma Estromático Endometrial/diagnóstico , Neoplasias Uterinas/diagnóstico , Área Bajo la Curva , Diagnóstico Diferencial , Neoplasias Endometriales/metabolismo , Femenino , Humanos , Inmunohistoquímica/métodos , Leiomioma/metabolismo , Leiomiosarcoma/metabolismo , Curva ROC , Sarcoma Estromático Endometrial/metabolismo , Análisis de Matrices Tisulares , Neoplasias Uterinas/metabolismo
5.
Kidney Int ; 84(6): 1207-13, 2013 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-23677244

RESUMEN

Individuals with HIV infection and two apolipoprotein L1 gene (APOL1) risk variants frequently develop nephropathy. Here we tested whether non-HIV viral infections influence nephropathy risk via interactions with APOL1 by assessing APOL1 genotypes and presence of urine JC and BK polyoma virus and plasma HHV6 and CMV by quantitative polymerase chain reaction. We analyzed 300 samples from unrelated and related first-degree relatives of African Americans with nondiabetic nephropathy using linear and nonlinear mixed models to account for familial relationships. The four groups evaluated were APOL1 zero/one versus two risk alleles, with or without nephropathy. Urine JCV and BKV were detected in 90 and 29 patients, respectively, whereas HHV6 and CMV were rare. Adjusting for family age at nephropathy, gender, and ancestry, presence of JCV genomic DNA in urine and APOL1 risk alleles were significantly negatively associated with elevated serum cystatin C, albuminuria (albumin-to-creatinine ratio over 30 mg/g), and kidney disease defined as an eGFR under 60 ml/min per 1.73 m(2) and/or albuminuria in an additive (APOL1 plus JCV) model. BK viruria was not associated with kidney disease. Thus, African Americans at increased risk for APOL1-associated nephropathy (two APOL1 risk variants) with JC viruria had a lower prevalence of kidney disease, suggesting that JCV interaction with APOL1 genotype may influence kidney disease risk.


Asunto(s)
Apolipoproteínas/genética , Negro o Afroamericano/genética , Virus JC/aislamiento & purificación , Enfermedades Renales/genética , Enfermedades Renales/virología , Lipoproteínas HDL/genética , Infecciones por Polyomavirus/virología , Infecciones Tumorales por Virus/virología , Adulto , Anciano , Albuminuria/etnología , Albuminuria/genética , Albuminuria/virología , Apolipoproteína L1 , Distribución de Chi-Cuadrado , Cistatina C/sangre , ADN Viral/orina , Femenino , Interacción Gen-Ambiente , Predisposición Genética a la Enfermedad , Tasa de Filtración Glomerular , Humanos , Virus JC/genética , Enfermedades Renales/sangre , Enfermedades Renales/etnología , Enfermedades Renales/fisiopatología , Enfermedades Renales/prevención & control , Modelos Lineales , Masculino , Persona de Mediana Edad , Dinámicas no Lineales , North Carolina/epidemiología , Fenotipo , Infecciones por Polyomavirus/etnología , Prevalencia , Factores de Riesgo , Infecciones Tumorales por Virus/etnología
6.
J Virol Methods ; 138(1-2): 170-6, 2006 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-17045346

RESUMEN

Human papillomavirus (HPV) is a necessary but insufficient cause of cervical cancer. Factors influencing transcription, such as epigenetic silencing through viral DNA methylation, may impact neoplastic progression. Pyrosequencing technology was applied to quantify methylation at 19 cytosine guanine dinucleotide (CpG) sites in the L1 3' and long control region (LCR) of HPV 16 DNA using cell lines, CaSki ( approximately 400 integrated copies of HPV 16) and SiHa (1-2 integrated copies of HPV 16) that differ in their transcriptional activity. Methylation levels ranged from 20 to 100% in CaSki and from 0 to 85% in SiHa over the entire 19 CpG sites, with a >40-fold difference in the methylation levels of their promoter and enhancer regions (SiHa<2% and CaSki 79%). The method was successful at a limiting dilution of 1-4 HPV 16 DNA copies/3000 cells, a level compatible with most clinical samples. The results were not affected by fixation in methanol-based liquid cytology collection fluid or method of extraction. Conditions optimized with cell lines were applicable to fixed exfoliated cervical cells. Pyrosequencing provides a quantitative site-specific assessment of methylation at multiple CpG sites without cloning, and is thus suited to large-scale molecular epidemiologic studies.


Asunto(s)
Metilación de ADN , ADN Viral/química , Papillomavirus Humano 16/genética , Análisis de Secuencia de ADN/métodos , Línea Celular Tumoral , ADN Viral/metabolismo , Humanos , Manejo de Especímenes
7.
J Virol Methods ; 136(1-2): 166-70, 2006 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-16784783

RESUMEN

Polymorphisms in human papillomavirus type 16 (HPV16) result in variants from the prototype sequence which can be designated according to geographic distribution and are broadly classified as European (E), African (Af), Asian (As), or Asian-American (AA). Detection of variants has been used to distinguish persistent HPV16 infection from re-infection in natural history studies, and variants have been associated with an increased risk of cervical disease in some populations. Variant determination usually relies on conventional Sanger sequencing of regions of the viral genome, with the major variant group assignments requiring the sequencing of only seven polymorphic sites spread over a 242-bp region of the E6 gene. We applied pyrosequencing to facilitate rapid sequencing and enable the simultaneous detection of multiple variants. A single-stranded template for pyrosequencing was prepared by amplifying a 314-bp fragment (nt 75-388) with a biotin at the 5'-end of the reverse primer to facilitate strand separation and purification. Polymorphisms at the nucleotide sites 109, 131, 132, 143, 145, 178 and 350 were determined in three separate sequencing reactions, one of which was a multiplex format. Pyrosequencing of 97 HPV16-positive exfoliated cervical samples confirmed the Sanger sequencing results; however pyrosequencing identified additional variants in several samples containing mixed variants.


Asunto(s)
ADN Viral/genética , Papillomavirus Humano 16/clasificación , Papillomavirus Humano 16/genética , Análisis de Secuencia de ADN/métodos , Secuencia de Bases , Cuello del Útero/virología , ADN Viral/aislamiento & purificación , Femenino , Papillomavirus Humano 16/aislamiento & purificación , Humanos , Datos de Secuencia Molecular , Proteínas Oncogénicas Virales/genética , Polimorfismo Genético , Proteínas Represoras/genética , Especificidad de la Especie
8.
Int J Pediatr Otorhinolaryngol ; 65(1): 65-8, 2002 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-12127225

RESUMEN

Gilles de la Tourette syndrome (TS) is a neurobehavioral disorder characterized by the presence of fluctuating involuntary motor and vocal tics. We report the case of a child in whom TS manifest as an involuntary recurrent complex tic presenting as a chronic cough. The clinical and pathological features and management of TS are reviewed.


Asunto(s)
Tos/diagnóstico , Síndrome de Tourette/diagnóstico , Niño , Enfermedad Crónica , Diagnóstico Diferencial , Femenino , Estudios de Seguimiento , Humanos , Síndrome de Tourette/terapia
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