Skip to content

New mechanism of bone growth uncovered.

Critically, the growth of children’s bones depends on growth plates situated close to the end of all long bones in the body.  These plates are narrow discs of cartilage providing a continuous supply of chondrocytes for bone formation.  However, it remains unknown how this supply is maintained throughout childhood growth. 

Now, a study from researchers led by the Karolinska Institutet shows bone growth in mice takes place in accordance with the same principles as when new cells are constantly produced in blood, skin, and other tissue.  The team states this contradicts the established theory stating bone growth is dependent on a finite number of gradually consumed progenitor cells.  The study is published in the journal Nature.

How we form new bone

Previous studies show chondrocytes form a kind of scaffold supporting the formation of new bone tissue, and are themselves generated from stem-cell-like progenitor cells called chondroprogenitors. For long bones to grow properly, chondrocytes must be generated constantly throughout the growth period.

The general view in the field is based on the premise that a limited number of progenitor cells are formed during embryonic development and consumed for bone growth until they run out and the person stops growing.  The current study investigates the formation of chondrocytes in mice to verify this fact.

The current study uses clonal genetic tracing in mice to demonstrate small ‘clones’ of cells are generated from the same progenitor cells during embryonic development, which is in line with the current view.

Results show, however, after birth there are dramatic changes in cell dynamics and large, stable clones are formed because chondroprogenitors acquire the ability to regenerate.  Data findings show there is a stem cell niche in growth plates capable of ceasing bone growth when disrupted, implying bone growth in mice follows a completely different principle to previous hypotheses.

The team states this progenitor cell behavior is typical for tissue constantly producing many new cells, such as skin, blood, and intestine. They go on to explain for these tissue types progenitor cells are known to be situated in a very specific micro-environment.

A new way to generate bone

This micro-environment, known as a stem cell niche, helps to generate the necessary cells, as well as enabling the progenitor cells to renew themselves. Consequently, if the niche is disrupted or dysfunctional, the progenitor cells become depleted and the tissue is damaged.

The team surmises they have identified a new mechanism of bone growth, namely a stem cell niche providing a continuous supply of chondrocytes over a prolonged period.  For the future, the researchers state if their findings also apply to humans, they could make an important contribution to the treatment of children with growth disorders.

Source: Karolinska Institutet

Don’t miss the latest discoveries from the health innovator community:

Healthinnovations View All

Michelle Petersen is the founder of Healthinnovations, having worked in the health and science industry for over 21 years, which includes tenure within the NHS and Oxford University. Healthinnovations is a publication that has reported on, influenced, and researched current and future innovations in health for the past decade.

Michelle has been picked up as an expert writer for Informa publisher’s Clinical Trials community, as well as being listed as a blog source by the world’s leading medical journals, including the acclaimed Nature-Springer journal series.

Healthinnovations is currently indexed by the trusted Altmetric and PlumX metrics systems, respectively, as a blog source for published research globally. Healthinnovations is also featured in the world-renowned BioPortfolio, BioPortfolio.com, the life science, pharmaceutical and healthcare portal.

Most recently the Texas A&M University covered The Top 10 Healthinnovations series on their site with distinguished Professor Stephen Maren calling the inclusion of himself and his team on the list a reflection of “the hard work and dedication of my students and trainees”.

Michelle Petersen’s copy was used in the highly successful marketing campaign for the mega-hit film ‘Jumanji: The Next Level, starring Jack Black, Karen Gilian, Kevin Hart and Dwayne ‘The Rock’ Johnson. Michelle Petersen’s copywriting was part of the film’s coverage by the Republic TV network. Republic TV is the most-watched English language TV channel in India since its inception in 2017.

An avid campaigner in the fight against child sex abuse and trafficking, Michelle is a passionate humanist striving for a better quality of life for all humans by helping to provide traction for new technologies and techniques within healthcare.

Leave a Reply

Translate »