25 research outputs found
Mitogen Inducible Gene-6 in Joint Health and Osteoarthritis
Osteoarthritis (OA) is the most common type of arthritis or degenerative disease and leads to chronic and functional disability affecting a patient鈥檚 quality of life. The etiology of OA is a heterogeneous multifactorial disease, with inflammatory, metabolic, and mechanical causes. Therefore, OA commonly affects a heterogeneous population, ranging widely from the middle-aged and elderly populations, although younger people may be affected as a result of injury or overuse. Moreover, OA is characterized by loss of articular cartilage, changes in subchondral bone, synovium and supporting structures that ultimately affect all the tissues necessary for joint function. Despite an increasing awareness of OA as a medical problem, there is a surprising absence of effective medical treatments beyond pain control and surgery. The progressive understanding of the pathophysiology of OA leads to the perception that the disease is not purely mechanical or aging, and clarification of the signalling pathways and molecular mechanisms is necessary to the clinical application.
Our lab has demonstrated the importance of Epidermal Growth Factor Receptor/Mitogen Inducible Gene 6 (EGFR/Mig-6) for joint development. I hypothesized that Mig-6 regulates cartilage homeostasis. We first started investigating the role of Mig-6 in cartilage using cartilage-specific (Col2) overexpression of Mig-6 in a mouse model. Using histopathological assessment, histological and imaging techniques, we concluded that these animals showed significantly greater cartilage breakdown with aging, while younger Mig-6over/over mice resulted in healthy articular cartilage. Moreover, 渭CT analysis showed small but significant reductions in the size of long bones of Mig-6over/over mice compared to control group (wild type).
To further analyze the in vivo animal model, we subsequently assessed Mig-6 in cartilage using skeleton (Prx1)-specific overexpression. I again evaluated the morphology of articular cartilage using histological techniques and long bones of these mice and concluded similar results from the previous study, I found that mice overexpressing Mig-6 displayed significantly cartilage damage.
Subsequently, we compared the disease progression between mice with cartilage-specific (Col2) overexpression of Mig-6 and controls after destabilization of medial meniscus surgery (DMM) to induce post-traumatic osteoarthritis (PTOA). Mig-6over/over mice exhibited behavioural changes (vertical activity count) and appeared to show accelerated cartilage breakdown in surgically induced OA. Collectively, these data demonstrate that Mig-6 plays an important mediating role in articular cartilage homeostasis and development of osteoarthritis. Overexpression of this protein compromises the joint鈥檚 homeostatic mechanisms, predisposing them to accelerated degeneration
Recubrimientos y superficies de alta absortancia y baja emisividad para aplicaciones solares t茅rmicas : Plan de ensayos
En el mercado de la energ铆a solar t茅rmica, y en especial en aplicaciones residenciales e industriales, la utilizaci贸n de superficies selectivas para la captaci贸n de radiaci贸n solar se ha convertido casi en un requerimiento indispensable. Si bien este tipo de productos se consigue com煤nmente en el 谩mbito internacional, las cantidades que se comercializan en nuestro medio son desproporcionadas en relaci贸n a la producci贸n nacional de colectores solares. El prop贸sito de este trabajo poder desarrollar un recubrimiento o superficie selectiva de buena relaci贸n calidad-costo, que pueda ser producida en forma semi-industrial para atender requerimientos limitados pero con posibilidad de aumentar la producci贸n en con cierta facilidad en el futuro. En este trabajo se presentan las metodolog铆as a seguir para evaluar distintos tipos de superficies selectivas.In the solar thermal market, and specially in residential and industrial applications, the use of selective coatings in the absorber of solar collectors has become an unquestionable requirement. Even though this kind of coatings can be obtained in the international market by direct importation, the quantities that are comercialized in Argentina are in disagreement with the local production of solar collectors and the value of the currency. The purpose of this work is to develop a selective coating with a good price-quality relationship that can be produced in semi industrial manner to attend limited demands and on second hand that its production can be enlarged according to local needs without enhancing its cost. In this work, the methodologies to follow for the evaluation of the different kind of selective surfaces are presented.Asociaci贸n Argentina de Energ铆as Renovables y Medio Ambiente (ASADES
Recubrimientos y superficies de alta absortancia y baja emisividad para aplicaciones solares t茅rmicas : Plan de ensayos
En el mercado de la energ铆a solar t茅rmica, y en especial en aplicaciones residenciales e industriales, la utilizaci贸n de superficies selectivas para la captaci贸n de radiaci贸n solar se ha convertido casi en un requerimiento indispensable. Si bien este tipo de productos se consigue com煤nmente en el 谩mbito internacional, las cantidades que se comercializan en nuestro medio son desproporcionadas en relaci贸n a la producci贸n nacional de colectores solares. El prop贸sito de este trabajo poder desarrollar un recubrimiento o superficie selectiva de buena relaci贸n calidad-costo, que pueda ser producida en forma semi-industrial para atender requerimientos limitados pero con posibilidad de aumentar la producci贸n en con cierta facilidad en el futuro. En este trabajo se presentan las metodolog铆as a seguir para evaluar distintos tipos de superficies selectivas.In the solar thermal market, and specially in residential and industrial applications, the use of selective coatings in the absorber of solar collectors has become an unquestionable requirement. Even though this kind of coatings can be obtained in the international market by direct importation, the quantities that are comercialized in Argentina are in disagreement with the local production of solar collectors and the value of the currency. The purpose of this work is to develop a selective coating with a good price-quality relationship that can be produced in semi industrial manner to attend limited demands and on second hand that its production can be enlarged according to local needs without enhancing its cost. In this work, the methodologies to follow for the evaluation of the different kind of selective surfaces are presented.Asociaci贸n Argentina de Energ铆as Renovables y Medio Ambiente (ASADES
Overexpression of MIG-6 in the cartilage induces an osteoarthritis-like phenotype in mice
漏 2020 The Author(s). Background: Osteoarthritis (OA) is the most common form of arthritis and characterized by degeneration of the articular cartilage. Mitogen-inducible gene 6 (Mig-6) has been identified as a negative regulator of the epidermal growth factor receptor (EGFR). Cartilage-specific Mig-6 knockout (KO) mice display increased EGFR signaling, an anabolic buildup of the articular cartilage, and formation of chondro-osseous nodules. Since our understanding of the EGFR/Mig-6 network in the cartilage remains incomplete, we characterized mice with cartilage-specific overexpression of Mig-6 in this study. Methods: Utilizing knee joints from cartilage-specific Mig-6-overexpressing (Mig-6 over/over ) mice (at multiple time points), we evaluated the articular cartilage using histology, immunohistochemical staining, and semi-quantitative histopathological scoring (OARSI) at multiple ages. MicroCT analysis was employed to examine skeletal morphometry, body composition, and bone mineral density. Results: Our data show that cartilage-specific Mig-6 overexpression did not cause any major developmental abnormalities in the articular cartilage, although Mig-6 over/over mice have slightly shorter long bones compared to the control group. Moreover, there was no significant difference in bone mineral density and body composition in any of the groups. However, our results indicate that Mig-6 over/over male mice show accelerated cartilage degeneration at 12 and 18 months of age. Immunohistochemistry for SOX9 demonstrated that the number of positively stained cells in Mig-6 over/over mice was decreased relative to controls. Immunostaining for MMP13 appeared increased in areas of cartilage degeneration in Mig-6 over/over mice. Moreover, staining for phospho-EGFR (Tyr-1173) and lubricin (PRG4) was decreased in the articular cartilage of Mig-6 over/over mice. Conclusion: Overexpression of Mig-6 in the articular cartilage causes no major developmental phenotype; however, these mice develop earlier OA during aging. These data demonstrate that Mig-6/EGFR pathways are critical for joint homeostasis and might present a promising therapeutic target for OA
Recubrimientos y superficies de alta absortancia y baja emisividad para aplicaciones solares t茅rmicas : Plan de ensayos
En el mercado de la energ铆a solar t茅rmica, y en especial en aplicaciones residenciales e industriales, la utilizaci贸n de superficies selectivas para la captaci贸n de radiaci贸n solar se ha convertido casi en un requerimiento indispensable. Si bien este tipo de productos se consigue com煤nmente en el 谩mbito internacional, las cantidades que se comercializan en nuestro medio son desproporcionadas en relaci贸n a la producci贸n nacional de colectores solares. El prop贸sito de este trabajo poder desarrollar un recubrimiento o superficie selectiva de buena relaci贸n calidad-costo, que pueda ser producida en forma semi-industrial para atender requerimientos limitados pero con posibilidad de aumentar la producci贸n en con cierta facilidad en el futuro. En este trabajo se presentan las metodolog铆as a seguir para evaluar distintos tipos de superficies selectivas.In the solar thermal market, and specially in residential and industrial applications, the use of selective coatings in the absorber of solar collectors has become an unquestionable requirement. Even though this kind of coatings can be obtained in the international market by direct importation, the quantities that are comercialized in Argentina are in disagreement with the local production of solar collectors and the value of the currency. The purpose of this work is to develop a selective coating with a good price-quality relationship that can be produced in semi industrial manner to attend limited demands and on second hand that its production can be enlarged according to local needs without enhancing its cost. In this work, the methodologies to follow for the evaluation of the different kind of selective surfaces are presented.Asociaci贸n Argentina de Energ铆as Renovables y Medio Ambiente (ASADES
Mapa de recursos energ茅ticos alternativos de la Rep煤blica Argentina. Primera versi贸n, aprovechamiento de energ铆a e贸lica y solar
En este trabajo se presenta la primera versi贸n del mapa de energ铆as renovables de la Rep煤blica Argentina. El mismo trabaja bajo entorno Windows. Permite hacer un mapeo del recurso solar y e贸lico y tambi茅n posee la opci贸n de realizar un dimensionamiento de instalaciones fotovoltaicas en cualquier parte del pa铆s. El objetivo a futuro es que el interesado pueda hacer un an谩lisis general o global para determinar los recursos regenerativos adecuados para una aplicaci贸n espec铆fica. De esta manera, ser谩n incorporadas planillas de dimensionamiento e贸lico en pr贸ximos trabajos. El programa puede ser descargado v铆a sitio web o pedido por mail sin costo alguno a [email protected]. El mismo constituye una herramienta de acceso ordenado a la informaci贸n existente sobre el recurso e贸lico y solar a cualquier persona. El mismo fue utilizado con 茅xito en la c谩tedra de energ铆as alternativas de la carrera de Ingenier铆a en Ecolog铆a de la Universidad de Flores.In this work, the first version of renewable energies map of Argentina is presented. It works under windows and allows for a mapping of the solar and wind resource. It also allows the user to make a photovoltaic system dimensioning in any part of the country. The goal in the near future is that any interested person can make the right choice between the solar and wind resource. In this way, simple dimensioning procedures for low power wind applications will be incorporated. The program can be downloaded via web site or ordered free of charge to [email protected]. This program constitutes a powerful tool of ordered access to information about the solar and eolic resource for any person. This version was used succesfully in teaching in the renewable energies subject of the ecology engineering degreee of Flores University.Asociaci贸n Argentina de Energ铆as Renovables y Medio Ambiente (ASADES
Mapa de recursos energ茅ticos alternativos de la Rep煤blica Argentina. Primera versi贸n, aprovechamiento de energ铆a e贸lica y solar
En este trabajo se presenta la primera versi贸n del mapa de energ铆as renovables de la Rep煤blica Argentina. El mismo trabaja bajo entorno Windows. Permite hacer un mapeo del recurso solar y e贸lico y tambi茅n posee la opci贸n de realizar un dimensionamiento de instalaciones fotovoltaicas en cualquier parte del pa铆s. El objetivo a futuro es que el interesado pueda hacer un an谩lisis general o global para determinar los recursos regenerativos adecuados para una aplicaci贸n espec铆fica. De esta manera, ser谩n incorporadas planillas de dimensionamiento e贸lico en pr贸ximos trabajos. El programa puede ser descargado v铆a sitio web o pedido por mail sin costo alguno a [email protected]. El mismo constituye una herramienta de acceso ordenado a la informaci贸n existente sobre el recurso e贸lico y solar a cualquier persona. El mismo fue utilizado con 茅xito en la c谩tedra de energ铆as alternativas de la carrera de Ingenier铆a en Ecolog铆a de la Universidad de Flores.In this work, the first version of renewable energies map of Argentina is presented. It works under windows and allows for a mapping of the solar and wind resource. It also allows the user to make a photovoltaic system dimensioning in any part of the country. The goal in the near future is that any interested person can make the right choice between the solar and wind resource. In this way, simple dimensioning procedures for low power wind applications will be incorporated. The program can be downloaded via web site or ordered free of charge to [email protected]. This program constitutes a powerful tool of ordered access to information about the solar and eolic resource for any person. This version was used succesfully in teaching in the renewable energies subject of the ecology engineering degreee of Flores University.Asociaci贸n Argentina de Energ铆as Renovables y Medio Ambiente (ASADES
Avances en el desarrollo de celdas fotovoltaicas de TiO2 sensitivizado a partir de insumos de bajo costo
Se presentan los avances en la metodolog铆a de construcci贸n de celdas fotovoltaicas de TiO2 sensitivizado, presentado en el Congreso Iberoamericano de Ambiente y Calidad de Vida en la Universidad Nacional de Catamarca en Noviembre de 2002. El objetivo del trabajo apunta a la utilizaci贸n de insumos de bajo costo que permitan obtener celdas fotovoltaicas de material alternativo siguiendo una metodolog铆a de producci贸n simple. El principio de funcionamiento de estos dispositivos se basa en los procesos de fotos铆ntesis de los vegetales, para lo cual se utiliza TiO2 como semiconductor el que se sensitiviza con soluciones colorantes de origen vegetal. Actualmente se est谩n estudiando alternativas para mejorar valores de tensi贸n y corriente generada, optimizando costos y procesos de fabricaci贸n.In this paper is shown the progress in the metodology of construcci贸n of TiO2 sensitized solar cells firstly introduced in the 2nd Iberoamerican Congress of Environmental and Life Quality at the National University of Catamarca, in November 2002. The objective of this work points to the use of low costs materials which allows to obtain photovoltaic cells following a simple procedure. The performing principles of this solar cells are based on the natural process of photosintesis. TiO2 is used as semiconductor, which is sensitized using natural dyes. At present, some alternatives to improve voltage and current values are being studied, in order to optimize costs and manufacturing process.Asociaci贸n Argentina de Energ铆as Renovables y Medio Ambiente (ASADES
Avances en el desarrollo de celdas fotovoltaicas de TiO2 sensitivizado a partir de insumos de bajo costo
Se presentan los avances en la metodolog铆a de construcci贸n de celdas fotovoltaicas de TiO2 sensitivizado, presentado en el Congreso Iberoamericano de Ambiente y Calidad de Vida en la Universidad Nacional de Catamarca en Noviembre de 2002. El objetivo del trabajo apunta a la utilizaci贸n de insumos de bajo costo que permitan obtener celdas fotovoltaicas de material alternativo siguiendo una metodolog铆a de producci贸n simple. El principio de funcionamiento de estos dispositivos se basa en los procesos de fotos铆ntesis de los vegetales, para lo cual se utiliza TiO2 como semiconductor el que se sensitiviza con soluciones colorantes de origen vegetal. Actualmente se est谩n estudiando alternativas para mejorar valores de tensi贸n y corriente generada, optimizando costos y procesos de fabricaci贸n.In this paper is shown the progress in the metodology of construcci贸n of TiO2 sensitized solar cells firstly introduced in the 2nd Iberoamerican Congress of Environmental and Life Quality at the National University of Catamarca, in November 2002. The objective of this work points to the use of low costs materials which allows to obtain photovoltaic cells following a simple procedure. The performing principles of this solar cells are based on the natural process of photosintesis. TiO2 is used as semiconductor, which is sensitized using natural dyes. At present, some alternatives to improve voltage and current values are being studied, in order to optimize costs and manufacturing process.Asociaci贸n Argentina de Energ铆as Renovables y Medio Ambiente (ASADES
Avances en el desarrollo de celdas fotovoltaicas de TiO2 sensitivizado a partir de insumos de bajo costo
Se presentan los avances en la metodolog铆a de construcci贸n de celdas fotovoltaicas de TiO2 sensitivizado, presentado en el Congreso Iberoamericano de Ambiente y Calidad de Vida en la Universidad Nacional de Catamarca en Noviembre de 2002. El objetivo del trabajo apunta a la utilizaci贸n de insumos de bajo costo que permitan obtener celdas fotovoltaicas de material alternativo siguiendo una metodolog铆a de producci贸n simple. El principio de funcionamiento de estos dispositivos se basa en los procesos de fotos铆ntesis de los vegetales, para lo cual se utiliza TiO2 como semiconductor el que se sensitiviza con soluciones colorantes de origen vegetal. Actualmente se est谩n estudiando alternativas para mejorar valores de tensi贸n y corriente generada, optimizando costos y procesos de fabricaci贸n.In this paper is shown the progress in the metodology of construcci贸n of TiO2 sensitized solar cells firstly introduced in the 2nd Iberoamerican Congress of Environmental and Life Quality at the National University of Catamarca, in November 2002. The objective of this work points to the use of low costs materials which allows to obtain photovoltaic cells following a simple procedure. The performing principles of this solar cells are based on the natural process of photosintesis. TiO2 is used as semiconductor, which is sensitized using natural dyes. At present, some alternatives to improve voltage and current values are being studied, in order to optimize costs and manufacturing process.Asociaci贸n Argentina de Energ铆as Renovables y Medio Ambiente (ASADES