Enamel organ proteins as targets for antibodies in celiac disease: implications for oral health.

Enamel defects in permanent and deciduous teeth may be oral manifestations of celiac disease. Sometimes they are the only sign that points to this underdiagnosed autoimmune pathology. However, the etiology of these specific enamel defects remains unknown. Based on previously reported cross-reactivity of antibodies to gliadin with the enamel proteins, amelogenin and ameloblastin, we analyzed (using immunohistochemistry) the ability of anti-gliadin IgG, produced during untreated disease, to recognize enamel organ structures. We used swine germ teeth as a tissue model because they are highly homologous to human teeth in terms of proteins and development biology. Strong staining of the enamel matrix and of the layer of ameloblasts was observed with serum samples from women with celiac disease; high IgG reactivity was found against both gliadin peptides and enamel matrix protein extract, but there was no IgG reactivity against tissue antigens. In line with these findings, the gamma globulin fraction from gliadin-immunized BALB/c mice showed a similar staining pattern to that of amelogenin-specific staining. These results strongly suggest a pathological role for antibodies to gliadin in enamel defect dentition for both deciduous and permanent teeth, considering that IgG can be transported through the placenta during fetal tooth development.

BDNF/TrkB/Akt Signaling Pathway Epithelial Odontogenic Tumors and Keratocyst: An Immunohistochemical Study Comparative With Dental Germs.

Odontogenic lesions (OL) are an important group of oral and maxillofacial diseases represented by odontogenic cysts, benign, and malignant tumors. The brain-derived neurotrophic factor (BDNF)/ tropomyosin receptor kinase B (TrkB) signaling pathway has multiple biological actions and has been identified as an important pathway in the proliferation, invasion, and survival of different epithelial tumors. Its role in the development of OL, however, has so far been unexplored. Our aim was to evaluate the BDNF/TrkB/Akt/p-RPS6 signaling pathway in OL of epithelial origin. This cross-sectional study comprised 3 cases of tooth germs, 25 cases of odontogenic keratocyst (OK), 29 cases of ameloblastoma (Am), and 6 cases of ameloblastic carcinoma. Immunohistochemical staining for BDNF, TrkB, p-Akt, and p-RPS6 was performed. OLs were evaluated according to the pattern of immunohistochemical expression in epithelial cells and by semiquantitative scores that considered the intensity of staining and percentage of positive cells. BDNF stromal expression was also assessed. No significant differences were observed with respect to the percentage of positive cases for all markers. Regarding the immunoreactive scores, BDNF and p-RPS6 expressions were similar in the odontogenic epithelium of all OL. However, TrkB and p-Akt were overexpressed in OK compared with ameloblastic carcinoma. In Am, epithelial BDNF was significantly higher compared with stromal expression. In conclusion, BDNF seems to participate in the development of cystic, benign, and malignant odontogenic epithelium to similar degrees. The acquisition of the invasive or malignant phenotype in odontogenic neoplasms is not associated with alterations in the BDNF/TrkB/Akt/RPS6 axis, which could be implicated in the differentiation process.

Mucocele de seno maxilar: revisión a propósito de un caso / Maxillary Sinus Mucocele: Review of case report

El Mucocele del seno maxilar es una formación quística benigna originada en el interior del mismo, limitado por un epitelio (mucosa sinusal) con un contenido de moco. Es una patología poco frecuente que puede causar grandes dificultades a la hora de resolver su terapéutica, sobre todo en aquellos casos que invaden la órbita llevando a una exoftalmia. El presente estudio reporta el caso de un mucocele de seno maxilar derecho, en una paciente de sexo femenino de 68 años. Al examen clínico se visualizaba una deformación por vestibular desde el área de la pieza dentaria 12 a la 16. Al examen imagenológico se observaba el seno maxilar ocupado con límites cercanos a la órbita. Se realizó una biopsia exéresis, con resultado histopatológico de Mucocele de seno maxilar. Se discute su presentación y tratamiento clásico...

Maxillary sinus mucocele is a benign cyst formation that originates within the sinus and is lined by epithelium (sinus mucosa) containing mucus. It is a rare condition for which it might be very difficult to find a suitable therapeutic approach, especially when it involves the orbit, leading to exophthalmos.This study reports the case of a right maxillary sinus mucocele in a 68-year-old female patient. Through clinical examination, vestibular deformation from tooth 12 to tooth 16 was determined. Radiologic examination showed that the maxillary sinus was affected, with borders near the orbit. An excision biopsy was performed, which showed histopathological findings of maxillary sinus mucocele. Presentation and classic treatment are discussed...

Tumor odontogénico escamoso asociado a la pared de un queratoquiste odontogénico / Squamous odontogenic tumor associated to the wall of an odontogenic keratocyst

Existen dos formas anatomoclínicas de TOE; una como tumor sólido originado a partir de los restos epiteliales de Malassez ubicados en el ligamento periodontal; y otra forma relacionado a membranas quísticas. Los casos de TOE desarrollados en membranas quísticas no revelan una agresividad mayor que la del propio quiste; y tampoco una tendencia a desarrollarse como tumores sólidos, aunque las proliferaciones epiteliales son morfológicamente iguales al TOE. Dadas las características de su comportamiento biológico, el tratamiento preferido es el de una conducta conservadora con el posterior seguimiento del paciente; en los casos así tratados la recidiva es rara