A network of trans-cortical capillaries as mainstay for blood circulation in long bones.
Nat Metab
; 1(2): 236-250, 2019 02.
Article
en En
| MEDLINE
| ID: mdl-31620676
Closed circulatory systems (CCS) underlie the function of vertebrate organs, but in long bones their structure is unclear, although they constitute the exit route for bone marrow (BM) leukocytes. To understand neutrophil emigration from BM, we studied the vascular system of murine long bones. Here we show that hundreds of capillaries originate in BM, cross murine cortical bone perpendicularly along the shaft and connect to the periosteal circulation. Structures similar to these trans-cortical-vessels (TCVs) also exist in human limb bones. TCVs express arterial or venous markers and transport neutrophils. Furthermore, over 80% arterial and 59% venous blood passes through TCVs. Genetic and drug-mediated modulation of osteoclast count and activity leads to substantial changes in TCV numbers. In a murine model of chronic arthritic bone inflammation, new TCVs develop within weeks. Our data indicate that TCVs are a central component of the CCS in long bones and may represent an important route for immune cell export from the BM.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Flujo Sanguíneo Regional
/
Huesos
/
Capilares
/
Microcirculación
Límite:
Animals
/
Humans
Idioma:
En
Revista:
Nat Metab
Año:
2019
Tipo del documento:
Article
País de afiliación:
Alemania
Pais de publicación:
Alemania