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Int. arch. otorhinolaryngol. (Impr.) ; 19(1): 93-95, Jan-Mar/2015. graf
Article in English | LILACS | ID: lil-741535


Introduction Schwannoma of the olfactory groove is an extremely rare tumor that can share a differential diagnosis with meningioma or neuroblastoma. Objectives The authors present a case of giant schwannoma involving the anterior cranial fossa and ethmoid sinuses. Case Report The patient presented with a 30-month history of left nasal obstruction, anosmia, and sporadic ipsilateral bleeding. Computed tomography of the paranasal sinuses revealed expansive lesion on the left nasal cavity extending to nasopharynx up to ethmoid and sphenoid sinuses bilaterally with intraorbital and parasellar extension to the skull base. Magnetic resonance imaging scan confirmed the expansive tumor without dural penetration. Biopsy revealed no evidence of malignancy and probable neural cell. Bifrontal craniotomy was performed combined with lateral rhinotomy (Weber-Ferguson approach), and the lesion was totally removed. The tumor measured 8.0 4.3 3.7 cm and microscopically appeared as a schwannoma composed of interwoven bundles of elongated cells (Antoni A regions)mixed with less cellular regions (Antoni B). Immunohistochemical study stained intensively for vimentin and S-100. Conclusion Schwannomas of the olfactory groove are extremely rare, and the findings of origin of this tumor is still uncertain but recent studies point most probably to the meningeal branches of trigeminal nerve or anterior ethmoidal nerves. .

Animals , Female , Male , Mice , Cell Membrane Permeability/physiology , Hair Cells, Auditory/physiology , Ion Channels/physiology , Mechanotransduction, Cellular/physiology , Animals, Newborn , Cadherins/genetics , Cell Membrane Permeability/genetics , Chelating Agents/pharmacology , Dihydrostreptomycin Sulfate/pharmacology , Embryo, Mammalian , Egtazic Acid/analogs & derivatives , Egtazic Acid/pharmacology , Hair Cells, Auditory/cytology , Hair Cells, Auditory/drug effects , In Vitro Techniques , Ion Channels/drug effects , Mice, Transgenic , Mechanotransduction, Cellular/drug effects , Mechanotransduction, Cellular/genetics , Membrane Potentials/drug effects , Membrane Potentials/genetics , Myosins/genetics , Organ of Corti/cytology , Protein Precursors/genetics
Indian J Hum Genet ; 2013 July-Sept ;19 (3): 325-330
Article in English | IMSEAR | ID: sea-156585


BACKGROUND: Hearing disorders represent a significant health problem worldwide. Recessive inherited cases of the deafness are more prevalent in Pakistan due to consanguineous marriages. Deafness caused by DFNB3 is due to mutation in the gene MYO XVA and its prevalence among Pakistani population is about 5%. MATERIALS AND METHODS: Families with at least two or more individual affected with deafness were selected from different areas of District Okara of Pakistan. Six consanguineous families of different ethnic groups having deaf individuals were studied. All these families had three or more deaf individuals in either two or more sib ships. Family history was taken to minimize the chances of other abnormalities. Pedigrees drawn by using Cyrillic software (version 2.1) showed that all the marriages were consanguineous and the families have recessive mode of inheritance. Three STR markers were selected and amplified on all the samples of six families through PCR. The PCR products were then genotyped on non denaturing polyacrylamide gel electrophoresis (PAGE). Haplotypes were constructed to determine the pattern of inheritance and also to determine whether a family was linked or unlinked with known DFNB3 locus. RESULTS: One out of six families showed linkage to the DFNB3 while rest of the families remained unlinked. Carriers of deafness genes were identified and information was provided to the families on request. CONCLUSION: Knowledge about the genetic causes of deafness provide insight into the variable expression of genes involved in this hereditary problem and may allow the prediction and prevention of associated health problems.

Consanguinity , Electrophoresis, Polyacrylamide Gel/methods , Family/genetics , Genetic Linkage , Hearing Loss/epidemiology , Hearing Loss/genetics , Humans , Microsatellite Repeats , Myosins/genetics , Myosins/genetics , Pedigree
Article in English | WPRIM | ID: wpr-194081


The integrity of blood vessels controls vascular permeability and extravasation of blood cells, across the endothelium. Thus, the impairment of endothelial integrity leads to hemorrhage, edema, and inflammatory infiltration. However, the molecular mechanism underlying vascular integrity has not been fully understood. Here, we demonstrate an essential role for A-kinase anchoring protein 12 (AKAP12) in the maintenance of endothelial integrity during vascular development. Zebrafish embryos depleted of akap12 (akap12 morphants) exhibited severe hemorrhages. In vivo time-lapse analyses suggested that disorganized interendothelial cell-cell adhesions in akap12 morphants might be the cause of hemorrhage. To clarify the molecular mechanism by which the cell-cell adhesions are impaired, we examined the cell-cell adhesion molecules and their regulators using cultured endothelial cells. The expression of PAK2, an actin cytoskeletal regulator, and AF6, a connector of intercellular adhesion molecules and actin cytoskeleton, was reduced in AKAP12-depleted cells. Depletion of either PAK2 or AF6 phenocopied AKAP12-depleted cells, suggesting the reduction of PAK2 and AF6 results in the loosening of intercellular junctions. Consistent with this, overexpression of PAK2 and AF6 rescued the abnormal hemorrhage in akap12 morphants. We conclude that AKAP12 is essential for integrity of endothelium by maintaining the expression of PAK2 and AF6 during vascular development.

A Kinase Anchor Proteins/genetics , Animals , Blood Vessels/abnormalities , Cell Cycle Proteins/genetics , Down-Regulation , Embryo, Nonmammalian/abnormalities , Gene Deletion , Gene Expression Regulation, Developmental , Hemorrhage/embryology , Human Umbilical Vein Endothelial Cells , Humans , Intercellular Junctions/genetics , Kinesins/genetics , Myosins/genetics , Zebrafish/embryology , p21-Activated Kinases/genetics