Inmunohistochemical evaluation of estrogen receptors alpha and beta in normal inferior turbinate mucosa / Evaluación inmunohistoquímica de los receptores de estrógenos alfa y beta en la mucosa normal de concha nasal inferior

It has been postulated that the nasal mucosa, like other human tissues, is affected by a complex interactive network of neuropeptides, cytokines, allergic and inflammatory mediators and hormones such as estrogen, in which associations between symptoms (e.g. nasal stuffiness and coryza) and hormonal variations deriving from pregnancy, use of hormonal contraceptives and menstrual cycle phases are observed. The objective is evaluating the presence of specific estrogen receptors (types alpha and beta) in inferior turbinate mucosa in healthy subjects without nasal symptoms. Samples of nasal inferior turbinate were removed from patients undergoing aesthetic nasal surgery, and analyzed using hematoxylin-eosin staining, followed by immunohistochemical preparations on paraffin-embedded sections from the material sample, to detect estrogen receptors alpha and beta. Positive immunohistochemical reactions for both beta and alpha receptors were found in various regions of the inferior nasal turbinate. In conclusion both alpha and beta receptors were found, though the expression of beta was greater and more intense in the anterior portion of the inferior turbinate. No difference was found between male and female patients regarding the intensity of expression of receptors in the inferior turbinate.

Se ha postulado que la mucosa nasal, al igual que otros tejidos humanos, se ve afectada por una compleja red interactiva de neuropéptidos, citoquinas, mediadores alérgicos e inflamatorios, y hormonas como el estrógeno, en el que las asociaciones entre los síntomas (por ejemplo, congestión nasal y catarro) y hormonales las variaciones derivadas del embarazo, se observó el uso de anticonceptivos hormonales y las fases del ciclo menstrual. El objetivo es evaluar la presencia de receptores de estrógenos específicos (tipos de alfa y beta) en la mucosa de la concha nasal inferior en sujetos sanos sin síntomas nasales. Las muestras de la concha nasal inferior fueron retirados de los pacientes sometidos a cirugía nasal estética y analizados mediante hematoxilina-eosina, seguidos de cortes de preparados de inmunohistoquímica incluídos en parafina de la muestra de material, para detectar los receptores de estrógenos alfa y beta. Las reacciones de inmunohistoquímica fueron positiva para ambos receptores alfa y beta, éstas se encuentran en diversas regiones del cornete nasal inferior. En conclusión, tanto los receptores alfa y beta se encuentran, aunque la expresión de la beta fue mayor y más intensa en la porción anterior de la concha nasal inferior. No se encontraron diferencias entre pacientes hombres y mujeres en relación con la intensidad de la expresión de los receptores en el concha nasal inferior.

Neuropeptide immunofluorescence in human nasal mucosa: assessment of the technique for vasoactive intestinal peptide (VIP).

UNLABELLED: Neuropeptides are important neurotransmitters in nasal physiology and the increasing knowledge of their role in nasal diseases brings new therapeutic perspectives. The investigation of human nasal mucosa neuropeptides is based mostly on immunocytochemistry, a complex approach whose resulting factors may be variable. Aiming to make this kind of research available, an immunofluorescence approach for vasoactive intestinal peptide (VIP) in human nasal mucosa is proposed and evaluated. STUDY DESIGN: Transversal cohort. MATERIAL AND METHOD: Human inferior turbinate samples were obtained at time of nasal surgery from eight patients. The samples were fixed in Zamboni solution (4% phosphate-buffered paraformaldehyde and 0.4% picric acid), snap-frozen and stored at -70 degrees C. 14 microm sections were then obtained. Immunofluorescence staining for VIP (Peninsula Laboratories) was performed and its images documented by conventional photography. The method's specificity, sensitivity and reproducibility of execution were evaluated. Additionally, the reproducibility of interpretation of results was evaluated through the comparison of staining scores (0 to 4) attributed to the images by six observers. RESULTS: The results showed the approach to be very specific and sensible, besides being reproducible in its execution. The interpretation of results may depend on the observer's accuracy in judging immunofluorescence images, but it showed uniformity. CONCLUSION: The proposed method was highly useful for research purposes in neuropeptides in human nasal mucosa.