ABSTRACT
Resumen: ANTECEDENTES La hipertensión arterial es un proceso crónico degenerativo ampliamente estudiado y relacionado con daños a órganos blanco, entre ellos el cerebro y su función cognitiva. Actualmente se cuenta con dispositivos que realizan mediciones ambulatorias por 24 horas, lo que abre una ventana para el estudio de los patrones circadianos y sus posibles afectaciones orgánicas. OBJETIVO Comparar los resultados del rendimiento cognitivo entre pacientes con patrones circadianos anómalos y fisiológicos de presión arterial sistémica de una comunidad rural en Yucatán. MATERIAL Y MÉTODO Estudio clínico epidemiológico con diseño observacional, analítico, transversal, efectuado de enero a diciembre de 2016. Se realizaron registros de presión arterial de 24 horas a sujetos mayores de 50 años de edad sin diagnóstico previo de hipertensión arterial. Posteriormente se les aplicó una batería de pruebas neurológicas del RBANS (Repeatable Battery for the Assessment of Neuropsychological Status). RESULTADOS Se realizaron 30 registros de presión arterial; al comparar entre el rendimiento cognitivo en los grupos de patrones circadianos anómalos y fisiológicos se encontró diferencia significativa (p = 0.028) con el análisis de X2 de Pearson, mostrando mayor frecuencia de rendimiento cognitivo alto en los que tenían patrones circadianos patológicos. CONCLUSIONES Se obtuvo una relación de mejor rendimiento cognitivo a mayor descenso de la presión arterial nocturna. Esto puede explicarse por la falta de un límite establecido para diferenciar el descenso de la presión arterial media nocturna fisiológica de la patológica en la población adulta media.
Abstract: BACKGROUND Hypertension is a chronic disease widely approached and related with several organic dysfunctions, brain damage and its cognitive performance among them. Nowadays we count with dispositives that can do arterial measures in an ambulatory form for 24 hours, which opens a path to study the circadian patterns and their possible consequences. OBJECTIVE To compare the cognitive performance between patients with physiologic and pathologic arterial circadian patterns in the inhabitants of a rural community in Yucatan. MATERIAL AND METHOD A clinical epidemiologic study, with observational analytic transversal and prospective design was done from January to December 2016. There were performed ambulatory arterial records of 24 hours in patients older than 50 years without previous diagnosis of hypertension. Then the RBANS (Repeatable Battery for the Assessment of Neuropsychological Status) battery was applied to them. RESULTS There were performed 30 ambulatory arterial records. We found a significant difference (p = 0.028) with the Pearson's X2 when contrasting the cognitive performance amount the circadian physiologic and pathologic patterns. It showed a bigger frequency of higher cognitive performance amount the patients with pathologic circadian patterns. CONCLUSIONS Patients seem to have a higher cognitive performance with a higher decline in their night arterial pressure. This could be explainef by the lack of an established limit to differentiate a physiologic arterial pressure decline with the pathologic one among adults in the middle age.
ABSTRACT
Trypanosoma cruzi antigens TSA-1 and Tc24 have shown promise as vaccine candidates in animal studies. We evaluated here the recall immune response these antigens induce in Chagasic patients, as a first step to test their immunogenicity in humans. We evaluated the in vitro cellular immune response after stimulation with recombinant TSA-1 (rTSA-1) or recombinant Tc24 (rTc24) in mononuclear cells of asymptomatic Chagasic chronic patients (n = 20) compared to healthy volunteers (n = 19) from Yucatan, Mexico. Proliferation assays, intracellular cytokine staining, cytometric bead arrays, and memory T cell immunophenotyping were performed by flow cytometry. Peripheral blood mononuclear cells (PBMC) from Chagasic patients showed significant proliferation after stimulation with rTc24 and presented a phenotype of T effector memory cells (CD45RA-CCR7-). These cells also produced IFN-γ and, to a lesser extent IL10, after stimulation with rTSA-1 and rTc24 proteins. Overall, both antigens recalled a broad immune response in some Chagasic patients, confirming that their immune system had been primed against these antigens during natural infection. Analysis of HLA-A and HLA-B allele diversity by PCR-sequencing indicated that HLA-A03 and HLA-B07 were the most frequent supertypes in this Mexican population. Also, there was a significant difference in the frequency of HLA-A01 and HLA-A02 supertypes between Chagasic patients and controls, while the other alleles were evenly distributed. Some aspects of the immune response, such as antigen-induced IFN-γ production by CD4+ and CD8+ T cells and CD8+ proliferation, showed significant association with specific HLA-A supertypes, depending on the antigen considered. In conclusion, our results confirm the ability of both TSA-1 and Tc24 recombinant proteins to recall an immune response induced by the native antigens during natural infection in at least some patients. Our data support the further development of these antigens as therapeutic vaccine against Chagas disease.
