Though we think of them as solid and permanent, our bones are actually constantly being rebuilt throughout our lives. A team of scientists at the Weizmann Institute of Science has now revealed how cells that work at remodeling the bones play a direct part in the ongoing renewal of another system the blood. Their findings, which may lead to future improvements in bone marrow transplantation and a better understanding of diseases involving bone or blood renewal, were published in the June issue of Nature Medicine.

Bones are really two systems in one. The cavities inside bones are filled with spongy bone marrow, in which stem cells divide and their daughter cells differentiate into all kinds of blood cells, including large numbers of immune cells for the body's defense. The hematopoietic (literally, blood-creating) stem cells, which can give rise to any kind of blood cell, reside in special 'stem cell niches' nestled in the bones' inner walls. Inside these sheltered nurseries, the stem cells remain undifferentiated; with the help of other nearby cells, they hang on to their juvenile qualities. Only when they leave the niches do they morph into specialized blood cells, possibly becoming immune cells for fighting infection or cells for blood clotting and healing after injury. They can even respond to calls for help from organs such as the liver, migrating through the bloodstream to assist in repairing damage.

The inner walls of the bones are also sites of intensive reconstruction. While one type of cell, the osteoblast, is busy building bone, its partner, the osteoclast, breaks it down and reassimilates the material. Osteoclasts are formed when several cells (which themselves originate from hematopoietic stem cells) fuse together at a signal from the osteoblasts, and the two work together in a sort of 'urban renewal' scheme to keep the bones healthy and strong.

The Weizmann Institute team headed by Prof. Tsvee Lapidot of the Immunology'"/>

Contact: Jennifer Manning
jennifer@acwis.org
212-895-7952
American Committee for the Weizmann Institute of Science
19-Jun-2006

Page: 1 2 3
Related biology news :

1. Bones in motion: Brown scientists to create new 3-D X-ray system
2. Bones at the nanoscale
3. Bones from blood: Scientists aim to break new ground on fractures
4. High blood pressure, low energy -- a recipe for heart failure
5. Brain blood flow gives clues to treating depression
6. Study finds gender differences in renal and other genes contributing to blood pressure
7. Study suggests estrogen deficiency can lead to obesity-induced high blood pressure after menopause
8. Research aims to identify markers for menopausal women at risk for deadly blood clot
9. Teamwork between 2 key proteins necessary for normal development and regulation of red blood cells
10. A low expression of MX2 gene exists in the white blood cells of narcoleptics
11. How a pain in the neck could be bad for your blood pressure