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1.
Rev Invest Clin ; 55(4): 423-8, 2003.
Article in English | MEDLINE | ID: mdl-14635607

ABSTRACT

INTRODUCTION: Chronic myeloid leukemia (CML) is characterized by a chromosomal translocation t(9; 22) resulting in the chimeric ber-abl oncogene that encode for the p210 protein which has an increased tyrosine kinase activity. The fusion part of this protein contains a novel aminoacid sequence. If peptides derived from this leukemia-specific part of p210 are expressed in the context of HLA molecules on malignant cells this may elicit immunologically specific responses. Recent studies using synthetic peptides identical to the bcr-abl fusion region revealed that breakpoint specific peptides are capable of binding to the class I molecules HLA-A3, -A11 and -B8. It has been shown that individuals expressing HLA-A3 or HLA-B8 have a diminished risk for development of CML in Caucasoid populations. Other authors have reported a statistically significant increase in the frequency of Cw3 and Cw4 antigens in Causcasoids and European CML patients. These data suggested that Cw3 and Cw4 may be markers for CML susceptibility on these populations. OBJECTIVE: To asses a possible susceptibility effect of these HLA molecules we studied 63 CML Mexican Mestizo patients and 746 healthy subjects for the distribution of HLA class I and class II molecules. RESULTS: The gene products that showed statistically significant differences between CML patients and controls were DR14, DR3, Cw3 and Cw4. DR14 and DR3 were significantly increased in the patients group with respect to the controls group (DR14 antigen frequency: 3.17% vs. 0.29%; p = 0.03; DR3 20.63% vs. 8.33%; p = 0.0001). Cw3 and Cw4 were significantly decreased in the patient group (Cw3 26.9% vs. 49.11%; p = 0.03; Cw4 antigen frequency 23.8% vs. 86.28%; p = 0.0000001). The relative risk for DR14 was 10.48 (95% CI 1.52-79.29) and for DR3 was 3.96 (95% CI 2.05-7.71). The relative risk for Cw3 was 0.38 (95% CI 0.08-1.79) and for Cw4 was 0.11 (95% CI 0.048-0.81). CONCLUSION: These results suggest that the development of CML is apparently associated with HLA phenotypes specific to each population, and indicate that Cw3 and Cw4 expression may result in a protective effect on the CML acquisition on Mexican Mestizo population probably by bcr-abl breakpoint peptides presentation through these HLA molecules.


Subject(s)
HLA-C Antigens/genetics , Leukemia, Myelogenous, Chronic, BCR-ABL Positive/genetics , Adolescent , Adult , Female , Humans , Leukemia, Myelogenous, Chronic, BCR-ABL Positive/epidemiology , Male , Mexico , Middle Aged
2.
Rev. mex. reumatol ; 8(6): 225-34, nov.-dic. 1993. ilus, tab
Article in Spanish | LILACS | ID: lil-139011

ABSTRACT

Las manifestaciones reumáticas de han reportado hasta en el 71 por ciento de los pacientes con infección por VIH, frecuentemente en estadios avanzados. Objetivo. Determinar el impacto en la frecuencia de manifestaciones reumáticas en pacientes con infección por VIH, comparados con controles de poblaciones similares VIH -. Pacientes y métodos. Se estudiaron en forma prospectiva, descriptiva y observacional 128 pacientes VIH+, 103 hombres y 25 mujeres, con edad promedio de 31.5 años (grupo I), comparándose con 130 pacientes con factores de riesgo semejantes, pero con serología negativa para VIH (Grupo II). Resultados. En el grupo I se identificaron alteraciones en 85/128 (66 por ciento); 52 tuvieron artralgias, 42 mialgias, entesitis y bursitis en 29, artritis asimétrica en 9 casos; y con hipersensibilidad, incapacitante y autolimitada en 7 pacientes. En este mismo grupo se encontró síndrome de Reiter en 10 casos (7 por ciento), fibromialgia en 10 (5 por ciento), complejo sicca, osteonecrosis, dermatopolimiositis, artritis séptica y podagra. En el grupo II, 6/130 pacientes (4 por ciento), tuvieron alteraciones menores (fibromialgia y artralgias) (p < 0.0001). Laboratorio. La eritrosedimentación acelerada (Grupo I) en 87/128 (67 por ciento), factor reumatoide 24/128 (18 por ciento), TTP prolongado 39/128 (30 por ciento), VDRL+ falso en 11/128 (8 por ciento), anticuerpos antinucleares en 16/128 (12 por ciento), anticuerpos anticardiolipina IgC 116/128 (86 por ciento), IgM 52/128 (40 por ciento). Se encontró hiperuricemia en 48/128 (37 por ciento) del grupo I y en 2 del grupo II (p < 0.0001), mientras que hipouricemia sólo en 6 pacientes VIH+. Once de dieciséis pacientes con sarcoma de Kaposi y enfermedades linfoproliferativas tuvieron alteraciones en los niveles de urato. Conclusiones. Las manifestaciones reumatológicas son frecuentes en pacientes VIH+, y su presencia puede indicar infección temprana en poblaciones de riesgo. En etapas tardías, la presencia de hiperuricemia puede ser utilizada como marcador y/o predictor de neoplasia


Subject(s)
Humans , Male , Female , Adult , HIV/isolation & purification , HIV/pathogenicity , Rheumatic Diseases/diagnosis , Rheumatic Diseases/physiopathology , Acquired Immunodeficiency Syndrome/classification , Acquired Immunodeficiency Syndrome/physiopathology
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