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1.
Rev. méd. Chile ; 131(12): 1375-1381, dic. 2003. ilus, tab
Article in Spanish | LILACS | ID: lil-360234

ABSTRACT

Background: The expression of heat shock proteins (HSP70) in tumor cells or virus infected cells is important for the induction of specific cellular immune response. They are implicated in transport of immunodominants peptides in the endoplasmic reticulum, activation of antigen presenting cells and cross priming of CD8 T cells. Aim: To analyze the expression of HSP70 protein in its constitutive (HSP73) and inducible forms (HSP72) in Hodgkin's lymphoma (HL), infected or not by Epstein Barr virus (EBV) and to assess its relationship with pathological subtype, clinical stages and treatment response. Material and methods: The analysis of HSP73 and HSP72 was done by immunoperoxidase on routinely processed paraffin sections with prior antigen retrieval. Results: Sixty seven cases were studied. The expression of HSP73 and HSP72 was detected in 19.4 and 17.9% of samples respectively. The infiltrating lymphocytes expressed HSP72 in 58% of cases. The pathological subtypes with the higher expression in lymphocytes were mixed cellularity and nodular sclerosis. No differences in HSP70 expression were observed, according to clinical stage, treatment response or the presence of EBV. Conclusions: The expression of HSP72 on lymphocytes suggests that this protein plays an important role in the induction and amplification of anti-tumor immune response (Rev Méd Chile 2003; 131: 1375-81).


Subject(s)
Humans , Male , Female , Infant, Newborn , Child, Preschool , Child , Adolescent , Adult , Middle Aged , Heat-Shock Proteins/metabolism , /isolation & purification , Hodgkin Disease/metabolism , Hodgkin Disease/virology , Colombia , Heat-Shock Proteins/immunology , /immunology , Hodgkin Disease/immunology
2.
Rev. méd. Chile ; 130(2): 143-151, feb. 2002. tab, graf
Article in Spanish | LILACS | ID: lil-313176

ABSTRACT

Background: Helicobacter pylori is recognized as an etiologic agent of several gastric diseases. Bacterial genotypes have been related to clinical outcome in several populations. Aim: To compare cagA, vacA and iceA genotypes of Colombian isolates from patients with several gastrointestinal diseases, including gastric cancer. Material and methods: We used polymerase chain reactions to amplify vacA, cagA and iceA genes of 137 H pylori isolates coming from 26 patients with gastric cancer (GC), 34 with peptic ulcer (PU), 19 with intestinal metaplasia (IM), 23 with atrophic gastritis (AG) and 35 with non atrophic gastritis (NAG). Results: vacA s1-m1, cagA+, iceA+ were the most frequently found genotypes. vacA s1 and m1 subtypes were found in 92 (67 percent) and 82 (60 percent) cases respectively. Sixty three percent were cagA+ and 85 percent were iceA+. There was a lower prevalence of s1 allele in cases of NAG (43 percent), compared with GC, PU and IM (81 percent, 77 percent and 81 percent prevalence, respectively, p <0.01). Isolates from NAG also showed a low frequency of vacA m1 subtype (40 percent) compared with GC or IM (81 percent and 84 percent respectively, p <0.01). The prevalence of cagA+ strains was significantly higher in GC patients (80 percent) than in NAG patients (51.4 percent, p <0.01). No differences in the frequency of vacA s1a, s1b and iceA subtypes, were observed. Conclusions: A lower frequency of cytotoxic H pylori genotypes such as cagA and vacA s1m1 and a higher frequency of non cytotoxic genotypes, was observed in patients with NAG, when compared to patients with GC or PU. These results suggest that even in Colombia, vacA and cagA could be used as markers of increased virulence


Subject(s)
Humans , Stomach Neoplasms , Helicobacter pylori , Genes, Bacterial , Peptic Ulcer/pathology , Colombia , Gene Frequency , Genotype , Gastritis, Atrophic/pathology , Gastritis, Hypertrophic/pathology
3.
Rev. ECM ; 3(1): 95-112, dic. 1997. tab
Article in Spanish | LILACS | ID: lil-385726

ABSTRACT

Objetivos- Determinar algunos efectos característicos agudos y crónicos en la salud de los agentes de tránsito, ubicados en la zona de influencia de la secretaría de tránsito y transporte de Santafé de Bogotá, expuestos a la contaminación ambiental; correlacionarlos con las mediciones ambientales de los siguientes contaminantes: Plomo (pb), Oxidos de nitrógeno (NO), Oxidos de azufre (SO), Ozono (O3), Monóxido de carbono (CO), Hidrocarburos (Hc), Partículas y Ruido; y comparar los hallazgos en la salud con un grupo no expuesto. Métodos- Se realizaron dos tipos de estudio, uno descriptivo de Prevalencía con el fin de determinar los efectos crónicos en la salud de los agentes de tránsito de Santafé de Bogotá (n=288) asociados a contaminación ambiental comparado con un grupo de personas no expuestas y otro de seguimiento prospectivo anidado en el de Prevalencía donde participaron 207 agentes, con el fín de evaluar efectos agudos y establecer una asociación con los niveles ambientales de los contaminantes evaluados durante el mes de octubre de 1993. Para el análisis estadístico se utilizaron pruebas de Prevalencía y análisis de regresión logística multivariado. Resultados- En el estudio de Prevalencía se hallaron diferencias significativas entre las prevalencias de los expuestos y no expuestos en el caso de alteraciones del sistema nervioso central siendo de 0.718 y 0.456 respectivamente y una relación positiva con el tiempo de servicio, con un RR de 1.098 = 0.042. Enfermedad pulmonar obstructiva crónica, EPOC, Asma, y alteraciones del Sistema Nervioso priférico se presentaron solo en los expuestos. El síndrome de estrés y reacción presenta una relación inversa con la edad. En el análisis multivariado se evidenció asociación con la edad en la Hipoacusia neurosensorial grado III y en los trastornos de equilibrio. De otro modo en la Hipoacusia grado II sin antecedentes ototóxicos se observó asociación con el tiempo de servicio. En el estudio de seguimiento prospectivo se hallo un incremento en las proporciones de Prevalencía entre la primera y la segunda evaluación en faringitis irritativa. Las pruebas biológicas se encontraron dentro de los limites normales. Con relación a los niveles contaminantes del estudio se encontraron superando la normal el (CO) en la estación de san Juan de Dios, NO2 en la avenida caracas con calle 53 y SO2 y partículas en la del Tunal


Subject(s)
Air Pollution , Industrial Pollutants
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