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Related Concept Videos

Blood and Nerve Supply to the Bones01:29

Blood and Nerve Supply to the Bones

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Bones are dynamic organs that require a rich supply of oxygen and nutrients. Around 5% to 10% of the cardiac output supplies blood to the bones. A typical long bone has three main sources: the nutrient artery, the metaphyseal and epiphyseal arteries, and the periosteal arteries.
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The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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Bone marrow transplant is a potential cure for several diseases, including cancer and specific genetic disorders. Notably, this procedure is applicable for patients suffering from aplastic anemia, certain types of leukemia, severe combined immunodeficiency disease (SCID), Hodgkin's disease, non-Hodgkin's lymphoma, multiple myeloma, thalassemia, sickle-cell disease, and certain cancers.
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Stem Cell Therapy for Tissue Regeneration01:21

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Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood cells.
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Blood vessel formation starts early during embryonic development, around day 7. In the extraembryonic yolk sac, mesodermal precursor cells called hemangioblast proliferate and differentiate into angioblast. Angioblasts express vascular endothelial growth factor receptor 2 or VEGFR2, which binds VEGF-A, a proangiogenic factor, guiding blood vessel formation. VEGF signaling promotes angioblasts to form a blood island in the developing embryo. Angioblasts further differentiate, giving rise to...
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Related Experiment Video

Updated: Jan 11, 2026

Computed Tomography and Optical Imaging of Osteogenesis-angiogenesis Coupling to Assess Integration of Cranial Bone Autografts and Allografts
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Directed vascularization in bone regeneration requires bone marrow reconstitution.

Julia Mehl1,2, Tobias Thiele1,2, Agnes Ellinghaus1,2

  • 1Julius Wolff Institute, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Berlin 13353, Germany.

JBMR Plus
|November 19, 2025
PubMed
Summary

This study reveals that bone regeneration is a directed process, with host marrow cells and blood vessels migrating into grafts. Marrow reconstitution guides healing, offering insights for enhanced bone repair strategies.

Keywords:
bone graft transplantationbone healingbone marrow reconstitutiondirected healingdirected vascularization

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Area of Science:

  • Regenerative Medicine
  • Skeletal Biology
  • Biomaterials Science

Background:

  • Bone regeneration is a complex process lacking full understanding of cellular dynamics and directional organization.
  • The link between cellular migration, vascularization, and marrow reconstitution in bone healing requires further investigation.

Purpose of the Study:

  • To investigate the cellular dynamics and directional organization during bone regeneration.
  • To elucidate the role of marrow reconstitution in guiding bone healing.

Main Methods:

  • Development of a novel double osteotomy mouse model with fluorescent reporter lines for cellular tracking.
  • Transplantation of bone grafts and monitoring of cellular migration and vascularization over 14 days.

Main Results:

  • Directed migration of host bone marrow cells and CD146-positive blood vessels into the graft was observed.
  • Marrow disintegration preceded invasion, with reconstitution progressing from the proximal host side.
  • Pre-flushing graft marrow enhanced subsequent marrow niche formation and accelerated reconstitution.

Conclusions:

  • Bone regeneration is a directional process guided by marrow reconstitution.
  • Understanding these mechanisms can inform strategies to improve bone repair and surgical interventions.