Video Experimental Relacionado
Updated: May 13, 2026
06:58
Culturing and Measuring Fetal and Newborn Murine Long Bones
Published on: April 26, 2019
Las múltiples fases del agrandamiento de los condrocitos subyacen a las diferencias en las proporciones esqueléticas
Kimberly L Cooper1, Seungeun Oh, Yongjin Sung
1Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA. kcooper@genetics.med.harvard.edu
Nature
|March 15, 2013
Resumen
El crecimiento óseo de los mamíferos depende del aumento del volumen de condrocitos. Este estudio revela tres fases distintas de la hinchazón de los condrocitos, con la fase final, regulada por el factor de crecimiento similar a la insulina, crucial para la determinación del tamaño esquelético.
Área de la Ciencia:
- Biología esquelética Biología esquelética.
- Fisiología celular La fisiología celular.
- Mecanismos de crecimiento de los mamíferos.
Sus antecedentes:
- La diversidad esquelética en los mamíferos está vinculada a las variaciones de longitud ósea.
- La hipertrofia de condrocitos en las placas de crecimiento es clave para el alargamiento del elemento esquelético.
- Los mecanismos de la ampliación del volumen de los condrocitos siguen siendo poco conocidos.
Objetivo del estudio:
- Para dilucidar los mecanismos de la ampliación del volumen de condrocitos durante el crecimiento esquelético.
- Para identificar las distintas fases del aumento del volumen de condrocitos.
- Para investigar la regulación del volumen de condrocitos y su impacto en el tamaño del esqueleto.
Principales métodos:
- Se empleó microscopía de fase cuantitativa para observar los cambios en el volumen de condrocitos.
- Análisis de la masa seca celular y la regulación del fluido durante la hinchazón de los condrocitos.
- Investigación de la dinámica de la placa de crecimiento en huesos de alargamiento rápido y lento.
Principales resultados:
- Los condrocitos de los mamíferos exhiben tres fases distintas de aumento de volumen.
- Una fase de hinchazón celular significativa implica la dilución de la masa seca celular.
- La duración de la fase final, caracterizada por el aumento de la masa seca, es crítica para la tasa de crecimiento y está regulada por el factor de crecimiento similar a la insulina.
Conclusiones:
- La regulación del volumen de condrocitos es un proceso complejo y de varias fases.
- La fase final de la ampliación del volumen de condrocitos es un determinante clave de la velocidad de alargamiento esquelético.
- La regulación local a través del factor de crecimiento similar a la insulina influye en el tamaño del esqueleto al modular la dinámica de crecimiento de los condrocitos.
Videos de Conceptos Relacionados
01:24Bone Formation by Endochondral Ossification
Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
01:09Changes in the Appendicular Skeleton with Age
The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
01:07Development of the Limb Synovial Joints
Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs...
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs...
01:27Growth of Cartilage and Bone Tissue
Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
01:40Bone Remodeling
Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
01:29Bone Formation by Intramembranous Ossification
Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...