Browsing by Author "Feuerhake, Teo"
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- ItemAlteración de signos vitales dentro de las 72 h previas a la activación de código azul en pacientes adultos hospitalizados de un hospital universitario(2018) Araos Baeriswyl, Esteban Andrés; Feuerhake, Teo; Mundaca, Manuel; Lara Hernández, Bárbara Alejandra; Ortega, Francisco; Aeschlimann del Río, Nicolás Alejandro; Eymin Lago, Gonzalo
- ItemClinical characterization of Chilean patients with ige-mediated food allergy(2018) Feuerhake, Teo; Aguilera Insunza, Raquel; Morales Matamala, Pamela Soledad; Talesnik Guendelman, Eduardo; Linn, Katherina; Thöne, Natalie Andrea; Borzutzky Schachter, Arturo
- ItemGalectin-8 counteracts folic acid-induced acute kidney injury and prevents its transition to fibrosis(2024) Perez-Moreno, Elisa; Toledo, Tomas; Campusano, Pascale; Zuniga, Sebastian; Azocar, Lorena; Feuerhake, Teo; Mendez, Gonzalo P.; Labarca, Mariana; Perez-Molina, Francisca; de la Pena, Adely; Herrera-Cid, Cristian; Ehrenfeld, Pamela; Godoy, Alejandro S.; Gonzalez, Alfonso; Soza, AndreaAcute kidney injury (AKI), characterized by a sudden decline in kidney function involving tubular damage and epithelial cell death, can lead to progressive tissue fibrosis and chronic kidney disease due to interstitial fibroblast activation and tissue repair failures that lack direct treatments. After an AKI episode, surviving renal tubular cells undergo cycles of dedifferentiation, proliferation and redifferentiation while fibroblast activity increases and then declines to avoid an exaggerated extracellular matrix deposition. Appropriate tissue recovery versus pathogenic fibrotic progression depends on fine-tuning all these processes. Identifying endogenous factors able to affect any of them may offer new therapeutic opportunities to improve AKI outcomes. Galectin-8 (Gal-8) is an endogenous carbohydrate-binding protein that is secreted through an unconventional mechanism, binds to glycosylated proteins at the cell surface and modifies various cellular activities, including cell proliferation and survival against stress conditions. Here, using a mouse model of AKI induced by folic acid, we show that pretreatment with Gal-8 protects against cell death, promotes epithelial cell redifferentiation and improves renal function. In addition, Gal-8 decreases fibroblast activation, resulting in less expression of fibrotic genes. Gal-8 added after AKI induction is also effective in maintaining renal function against damage, improving epithelial cell survival. The ability to protect kidneys from injury during both pre- and post-treatments, coupled with its anti-fibrotic effect, highlights Gal-8 as an endogenous factor to be considered in therapeutic strategies aimed at improving renal function and mitigating chronic pathogenic progression.
- ItemGalectin-8 induces partial epithelial-mesenchymal transition with invasive tumorigenic capabilities involving a FAK/EGFR/proteasome pathway in Madin-Darby canine kidney cells(2018) Oyanadel, Claudia; Holmes, Christopher; Pardo, Evelyn; Retamal, Claudio; Shaughnessy, Ronan; Smith, Patricio; Cortes, Priscilla; Bravo-Zehnder, Marcela; Metz, Claudia; Feuerhake, Teo; Romero, Diego, V; Carlos Roa, Juan; Montecinos, Viviana; Soza, Andrea; Gonzalez, AlfonsoEpithelial cells can acquire invasive and tumorigenic capabilities through epithelial-mesenchymal- transition (EMT). The glycan-binding protein galectin-8 (Gal-8) activates selective beta 1-integrins involved in EMT and is overexpressed by certain carcinomas. Here we show that Gal-8 overexpression or exogenous addition promotes proliferation, migration, and invasion in nontumoral Madin-Darby canine kidney (MDCK) cells, involving focal-adhesion kinase (FAK)-mediated transactivation of the epidermal growth factor receptor (EGFR), likely triggered by alpha 5 beta 1 integrin binding. Under subconfluent conditions, Gal-8-overexpressing MDCK cells (MDCK-Gal-8(H)) display hallmarks of EMT, including decreased E-cadherin and up-regulated expression of vimentin, fibronectin, and Snail, as well as increased beta-catenin activity. Changes related to migration/invasion included higher expression of alpha 5 beta 1 integrin, extracellular matrix-degrading MMP13 and urokinase plasminogen activator/urokinase plasminogen activator receptor (uPA/uPAR) protease systems. Gal-8-stimulated FAK/EGFR pathway leads to proteasome overactivity characteristic of cancer cells. Yet MDCK-Gal-8H cells still develop apical/basolateral polarity reverting EMT markers and proteasome activity under confluence. This is due to the opposite segregation of Gal-8 secretion (apical) and beta 1-integrins distribution (basolateral). Strikingly, MDCK-Gal-8(H) cells acquired tumorigenic potential, as reflected in anchorage-independent growth in soft agar and tumor generation in immunodeficient NSG mice. Therefore, Gal-8 can promote oncogenic-like transformation of epithelial cells through partial and reversible EMT, accompanied by higher proliferation, migration/invasion, and tumorigenic properties.
- ItemGalectin-8 induces partial epithelial–mesenchymal transition with invasive tumorigenic capabilities involving a FAK/EGFR/proteasome pathway in Madin–Darby canine kidney cells(2018) Oyanadel, Claudia; Holmes Videla, Christopher Edward; Pardo Huguet, Evelyn Cristina; Retamal Villarroel, Claudio Enrique; Shaughnessy, Ronan Patrick; Smith, Patricio C.; Cortés Martínez, Priscilla Rocío; Bravo Zehnder, Marcela; Metz Baer, Claudia Andrea; Feuerhake, Teo; Romero, Diego; Roa Strauch, Juan Carlos Enrique; Montecinos, Viviana; Soza Gajardo, Andrea; González, Alfonso
- ItemPediatric ANCA-associated vasculitis, a case seriesVasculitis asociadas a ANCA en pediatría, serie de casos clínicos(2021) Cid, Bárbara Javiera; Feuerhake, Teo; Méndez, Gonzalo P.; Talesnik, Eduardo; Borzutzky Schachter, ArturoLas vasculitis asociadas a ANCA (AAV) son enfermedades infrecuentes en la edad pediátrica. La literatura internacional en pediatría es escasa y la mayoría de las publicaciones se refieren a otras vasculitis de mayor incidencia en la infancia, como la vasculitis IgA y enfermedad de Kawasaki. Objetivo: Describir las características clínicas y de laboratorio de una serie de pacientes pediátricos con diagnóstico de AAV. Pacientes y Método: Estudio retrospectivo, descriptivo, de pacientes con diagnóstico de AAV atendidos en un centro terciario de salud en Santiago, Chile, entre los años 2000 y 2020. Se revisaron fichas electrónicas recolectando datos epidemiológicos, de laboratorio, imágenes y biopsias. Resultados: Se presentan cinco pacientes pediátricos con AAV de severidad variable, rango de edad al debut 5,5 a 13,5 años. Destaca una frecuencia elevada de compromiso renal en casos de poliangeítis microscópica (MPA) y el compromiso orbitario de tipo pseudotumor inflamatorio en pacientes con granulomatosis con poliangeítis (GPA); manifestación poco frecuente en series pediátricas internacionales. Los pacientes fueron tratados según recomendaciones extrapoladas de ensayos clínicos en población adulta con respuesta clínica satisfactoria; en su mayoría con corticoides sistémicos y ciclofosfamida o rituximab en etapa de inducción. Durante la mantención, la mayoría de pacientes se mantuvo estable con rituximab, azatioprina o metotrexato. Ningún paciente evolucionó con secuelas en órganos afectados y todos lograron suspender la terapia corticoidal. Conclusión: El presente reporte describe las características clínicas de una serie de pacientes pediátricos con AAV. En esta serie, la afectación renal fue frecuente en MPA y la afectación ocular por pseudotumor inflamatorio en GPA. La respuesta clínica con tratamiento según recomendaciones extrapoladas de población adulta fue favorable.
- ItemVisualizing Touton Giant Cells Under Reflectance Confocal Microscopy in Two Cases of Juvenile Xanthogranuloma(2023) Peirano, Dominga; Donoso, Francisca; Hidalgo, Leonel; Feuerhake, Teo; Scope, Alon; Longo, Caterina; Navarrete-Dechent, Cristian