Evaluation of miR-196a2 expression and Annexin A1 level in children with bronchial asthmaEvaluation of miR-196a2 expression and Annexin A1 level in children

BACKGROUND: Annexin A1 (ANXA1) is an important anti-inflammatory mediator that may play a significant role in bronchial asthma. MiR-196a2 can target ANXA1 and therefore may play a role in the pathogenesis of asthma. AIM OF STUDY: This is the first study which aimed to evaluate the expression of miR-196a2 in the serum of asthmatic children and correlate its expression with ANXA1 serum level and asthma severity. SUBJECTS AND METHODS: The study included 100 asthma patients who were subdivided into three groups (mild, moderate and severe) and 50 healthy control subjects. Assessment of miR-196a2 expression and ANXA1 serum level were done using quantitative reverse transcriptase PCR (RT qPCR) and Elisa techniques, respectively. RESULTS: Compared to the control group, asthmatic children showed an increased ANXA1 serum level and decreased expression of miR-196a2 (p = 0.001). However, ANXA1 serum level was lower and miR-196a2 expression was higher in severe asthmatic patients compared to moderate asthmatic ones (p = 0.01, 0.03). Pearson's correlation coefficient revealed no significant correlations between ANXA1 serum level and miR-196a2 expression in the patient group (p = 0.9). CONCLUSIONS: Altered miR-196a2 expression and serum ANXA1 concentration may play a role in the pathogenesis of asthma. In addition, ANXA1 and miR-196a2 may represent potential diagnostic biomarkers for asthma and future targets for therapy

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Expresión de las anexinas A1 y A2 en la mucosa del tracto aerodigestivo superior / Expression of annexins A1 and A2 in the mucosa of the upper aerodigestive tract

Introducción: Las anexinas A1 y A2 se han relacionado con el mantenimiento de la integridad tisular. Han sido identificadas en varios tejidos humanos pero su expresión en el tracto aerodigestivo superior es poco conocida. El objetivo de este trabajo es estudiar la expresión de estas proteínas en la mucosa del tracto aerodigestivo superior. Material y métodos: Se estudian muestras de mucosa respiratoria (nasal y laríngea) y digestiva (de cavidad oral y faringe) de pacientes intervenidos de cirugía no oncológica. La expresión de las anexinas A1 y A2 se estudia por inmunohistoquímica. Resultados: Ambas anexinas se expresan tanto en el epitelio ciliado pseudoestratificado como en el plano poliestratificado no queratinizado, pero con un patrón diferente; la anexina A1 se expresa en las células más diferenciadas, mientras que la A2 lo hace en las menos diferenciadas (con la excepción de los cilios de las células ciliadas). Conclusión: Aunque las anexinas A1 y A2 están estructural y filogenéticamente relacionadas, su diferente expresión en la mucosa del tracto aerodigestivo superior sugiere que participan en funciones claramente diferenciadas (AU)

INTRODUCTION: Annexins A1 and A2 have been related with the maintenance of tissue integrity. They have been identified in a wide variety of tissues, but little is known regarding their expression in upper the aerodigestive tract. The aim of this work is to describe the expression of these proteins in the mucosa of the upper aerodigestive tract. MATERIAL AND METHODS: Tissue samples from respiratory (nasal and laryngeal) and digestive (oral and pharyngeal) mucosa from non-oncological patients were studied. Annexin A1 and A2 expression was determined by immunohistochemistry. RESULTS: Both annexins were expressed in the ciliated and in the stratified non-keratinized epithelia, but with a different pattern; ANXA1 was expressed in the more differentiated cells whereas ANXA2 was expressed in the less differentiated ones (with the exception of the cilia of ciliated cells). CONCLUSION: Although annexins A1 and A2 are structurally and philogenetically related its expression pattern in the upper aerodigestive tract suggests that they have different functions (AU)