Video Experimental Relacionado
Updated: Mar 3, 2026
08:01
The Soft Agar Colony Formation Assay
Published on: October 27, 2014
114.1K
Agonistas Wnt sustitutos que hacen una fenocopia de las señales canónicas de Wnt y β-catenina
Claudia Y Janda1, Luke T Dang2, Changjiang You3
1Department of Molecular and Cellular Physiology, Howard Hughes Medical Institute, and Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94305, USA.
Nature
|May 4, 2017
Resumen
Los investigadores desarrollaron agonistas de Wnt solubles en agua que activan vías específicas de señalización de Wnt. Estos nuevos agonistas superan los desafíos de las proteínas Wnt tradicionales, lo que permite un mejor estudio y aplicaciones terapéuticas en medicina regenerativa.
Área de la Ciencia:
- La bioquímica
- Biología celular
- La Medicina Regenerativa
Sus antecedentes:
- Las proteínas Wnt regulan la proliferación celular, la diferenciación y la autorrenovación de las células madre a través de la señalización de la beta-catenina.
- La hidrofobia y la reactividad cruzada de la proteína Wnt complican los estudios funcionales y el uso terapéutico.
- La palmitoilación de las proteínas Wnt es esencial para la secreción y la interacción con los receptores, pero dificulta la purificación.
Objetivo del estudio:
- Desarrollar nuevos agonistas Wnt solubles en agua que superen las limitaciones de las proteínas Wnt nativas.
- Investigar la activación de la señalización Wnt utilizando las interacciones específicas de los receptores Frizzled (FZD).
- Explorar el potencial terapéutico de los agonistas de Wnt en la medicina regenerativa.
Principales métodos:
- Desarrollo de heterodimerizantes Frizzled-LRP5/LRP6 solubles en agua como sustitutos de los agonistas de Wnt.
- Se utilizan dominios de unión específicos de FZD5/FZD8 y ampliamente reactivos a FZD.
- Se evaluó la respuesta de señalización de la beta-catenina, el compromiso del linaje osteogénico y el crecimiento del cultivo organoide.
Principales resultados:
- Los agonistas Wnt sustitutos provocaron una señalización de la beta-catenina selectiva por FZD, similar a la de WNT3A.
- Mejora la diferenciación osteogénica de las células madre mesenquimales y apoya el crecimiento organoide.
- Se ha demostrado la actividad de Wnt in vivo en el hígado de ratón, afectando a la zonificación metabólica y promoviendo la proliferación de hepatocitos.
Conclusiones:
- Los ligandos bispecíficos que inducen la heterodimerización del receptor pueden activar la señalización canónica de Wnt.
- Los sustitutos Wnt fácilmente producidos y sin lípidos facilitan los estudios funcionales.
- Los agonistas subrogados de Wnt ofrecen vías prometedoras para aplicaciones de medicina regenerativa.
Videos de Conceptos Relacionados
02:54Canonical Wnt Signaling Pathway
10.8K
The gene encoding the main signaling molecules of the Wnt signaling pathways (the Wnt proteins) was discovered almost four decades ago by Nüsslein-Volhard and Wieschaus. They identified and originally named the gene "wingless" (wg) after a phenotype discovered during their landmark genetic screen in Drosophila for body pattern defects. At around the same time, another researcher named Harold Varmus found that a murine tumor virus activates the mammalian wg homolog, Int-1, which...
10.8K
01:41Non-Canonical Wnt Signaling Pathways
8.5K
Wnt is a zygotic effect gene that is expressed during very early embryonic development. It regulates various processes in animals starting from early development through the adult stage, such as organogenesis in the embryo and maintenance of neuronal and blood stem cells. Wnt proteins can induce a wide variety of intracellular pathways depending upon the specific abilities of different Wnt ligands to form a complex with shared and cognate receptors in the presence of different co-receptors. The...
8.5K
01:23Catenins
3.2K
Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the...
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the...
3.2K
01:16TGF - β Signaling Pathway
10.8K
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
10.8K
01:27Transducer Mechanism: Enzyme-Linked Receptors
4.5K
Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
Major types that are helpful drug targets include:
4.5K
02:33Hedgehog Signaling Pathway
10.3K
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
10.3K