Differential induction of cytokines by human neonatal, adult, and elderly monocyte/macrophages infected with dengue virus.

Immunosuppressive status against infections in monocytes from neonates and elderly subjects has been reported. The interaction between dengue virus and monocytes/macrophages plays an important role during dengue disease. The aim of this study was to determine the cytokine response of monocytes from individuals with different ages after infection with dengue virus. Monocyte/macrophage cultures from neonatal, adult, and elderly subjects (n=10 each group) were incubated with all four dengue virus types (DENV-1 to -4). After 1 and 3 days of culture, cytokine concentrations (TNF-α, IL-6, and IL-1ß) were determined in culture supernatants by enzyme-linked immunosorbant assay. Increased production of all studied cytokines was induced by the different viral types in monocyte/macrophage cultures regardless of their source. However, lower cytokine concentrations were found in neonatal and elderly monocytes. The relative monocyte/macrophage immunosuppressive status observed in neonates and the elderly could be relevant during dengue infection in those age groups and important in innate and adaptive immunity responses against this virus.

Differential oxidative stress induced by dengue virus in monocytes from human neonates, adult and elderly individuals.

Changes in immune response during lifespan of man are well known. These changes involve decreased neonatal and elderly immune response. In addition, it has been shown a relationship between immune and oxidative mechanisms, suggesting that altered immune response could be associated to altered oxidative response. Increased expression of nitric oxide (NO) has been documented in dengue and in monocyte cultures infected with different types of dengue virus. However, there is no information about the age-dependent NO oxidative response in humans infected by dengue virus. In this study, monocyte cultures from neonatal, elderly and adult individuals (n = 10 each group) were infected with different dengue virus types (DENV- 1 to 4) and oxidative/antioxidative responses and apoptosis were measured at days 1 and 3 of culture. Increased production of NO, lipid peroxidation and enzymatic and nonenzymatic anti-oxidative responses in dengue infected monocyte cultures were observed. However, neonatal and elderly monocytes had lower values of studied parameters when compared to those in adult-derived cultures. Apoptosis was present in infected monocytes with higher values at day 3 of culture. This reduced oxidant/antioxidant response of neonatal and elderly monocytes could be relevant in the pathogenesis of dengue disease.

Infección por Chlamydia trachomatis en mujeres consultantes en Maracaibo, Venezuela / Chlamydia trachomatis infection in females consulting health centres in Maracaibo, Venezuela

Objetivo Evaluar la prevalencia de infecciones por Chlamydia trachomatis en un grupo de mujeres sintomáticas y asintomáticas que asistieron a control en servicios de ginecología en centros de salud de Maracaibo, estado Zulia. Métodos Se incorporaron al estudio 168 pacientes que asistieron a dos centros de salud de Maracaibo. Se llevó a cabo evaluación ginecológica basada en examen pélvico, de áreas profundas de la vagina y cuello uterino. Las pacientes fueron clasificadas en grupos etarios y de acuerdo a la presencia de manifestaciones clínicas. Para investigar C. trachomatis, se aplicaron dos ensayos de amplificación de ADN del plásmido endógeno y del gen OMP1, a partir de hisopados endocervicales. Resultados Se evaluaron 168 pacientes, 81 (48,2 por ciento) sintomáticas y 87 (51,8 por ciento) asintomáticas. Se encontró una prevalencia de 7,7 por ciento en la población total evaluada. La prevalencia fue de 9,9 por ciento y 5,8 por ciento para las pacientes sintomáticas y asintomáticas, respectivamente (p>0,05). El grupo de pacientes de 18-28 años exhibió la más alta prevalencia (13,7 por ciento) (p=0,0322). Las manifestaciones clínicas predominantes fueron secreción mucopurulenta (35,8 por ciento) y cervicitis (21 por ciento). C. trachomatis fue detectada en 7,1 por ciento pacientes con secreción mucopurulenta y 23,5 por ciento casos de cervicitis, pero no se demostró asociación significativa entre infección y manifestaciones clínicas individuales (p>0,05). Conclusión Se encontró una mediana prevalencia de infecciones por C. trachomatis en la población evaluada, exhibiendo mayor frecuencia en mujeres jóvenes. Este microorganismo debería ser investigado en mujeres jóvenes sexualmente activas, independientemente de su condición sintomática o asintomática.

Objective Evaluating Chlamydia trachomatis infection prevalence in a group of symptomatic and asymptomatic females attending gynaecology services in health centres in Maracaibo in the state of Zulia in Venezuela. Methodology 168 patients attending two health centres in Maracaibo were included in this study. Gynaecological evaluation was based on examining the pelvis, deep areas of the vagina and the cervix. Patients were classified into groups according to age and the presence of clinical manifestations. Two DNA amplification assays of endogenous plasmid and the omp1 gene taken from endocervical swabs were used for investigating C. trachomati. Results 168 patients were evaluated; 81 (48,2 percent) were symptomatic and 87 (51,8 percent) asymptomatic, A 7,7 percent prevalence (p>0.05) was found in the total population (9,9 percent prevalence for symptomatic patients and 5,8 percent for asymptomatic ones). The 18- 28 year old patient group exhibited the highest prevalence (13,7 percent) (p=0.0322). The predominant clinical manifestations were mucopurulent secretion (35,8 percent) and cervicitis (21 percent). C. trachomatis was detected in 7,1 percent of patients having mucopurulent secretion and 23,5 percent of cervicitis cases; however, no significant association between infection and individual clinical manifestations was shown (p>0.05). Conclusion Medium C. trachomatis infection prevalence was found In the population being assessed here, the highest frequency being exhibited in young females. This microorganism should be investigated in sexually-active young women, regardless of their symptomatic or asymptomatic status.

[Chlamydia trachomatis infection in females consulting health centres in Maracaibo, Venezuela]. / Infección por Chlamydia trachomatis en mujeres consultantes en Maracaibo, Venezuela.

OBJECTIVE: Evaluating Chlamydia trachomatis infection prevalence in a group of symptomatic and asymptomatic females attending gynaecology services in health centres in Maracaibo in the state of Zulia in Venezuela. METHODOLOGY: 168 patients attending two health centres in Maracaibo were included in this study. Gynaecological evaluation was based on examining the pelvis, deep areas of the vagina and the cervix. Patients were classified into groups according to age and the presence of clinical manifestations. Two DNA amplification assays of endogenous plasmid and the omp1 gene taken from endocervical swabs were used for investigating C. trachomati. RESULTS: 168 patients were evaluated; 81 (48,2 %) were symptomatic and 87 (51,8 %) asymptomatic, A 7,7 % prevalence (p>0.05) was found in the total population (9,9 % prevalence for symptomatic patients and 5,8 % for asymptomatic ones). The 18- 28 year old patient group exhibited the highest prevalence (13,7 %) (p=0.0322). The predominant clinical manifestations were mucopurulent secretion (35,8 %) and cervicitis (21 %). C. trachomatis was detected in 7,1 % of patients having mucopurulent secretion and 23,5 % of cervicitis cases; however, no significant association between infection and individual clinical manifestations was shown (p>0.05). CONCLUSION: Medium C. trachomatis infection prevalence was found In the population being assessed here, the highest frequency being exhibited in young females. This microorganism should be investigated in sexually-active young women, regardless of their symptomatic or asymptomatic status.