Study reveals how mechanical forces drive skeletal development

Study reveals how mechanical forces drive skeletal development
TRPV4 protein expression is mechanically regulated in developing joint cartilage. (A) Immunofluorescence staining of the TRPV4 protein in the growth plate (GP; a and d), medial condyles (b and e), and lateral condyles (c and f) of femora subjected to static and dynamic culture conditions (n = 3 limbs per group). Blue, 4′,6-diamidino-2-phenylindole (DAPI); green, TRPV4. Scale bars, 100 μm. (B) Quantification of pooled cell TRPV4 protein immunofluorescence intensity within the growth plate, medial condyle, and lateral condyle. * indicates a significant difference between groups (P < 0.05). Credit: Science Advances (2023). DOI: 10.1126/sciadv.ade2155

New research has revealed how mechanical forces caused by fetal movements drive skeletal development in the embryo.

The study was published and featured in the journal Science Advances. Its findings indicate that an ion channel called TRPV4 may be a valuable target in future treatments for abnormalities of pediatric skeletal development.

The study was led by first author Dr. Nidal Khatib, Postdoctoral Researcher at Imperial College London, and Professor Niamh Nowlan, Full Professor of Biomedical Engineering at University College Dublin (UCD).

Professor Nowlan said, "This research identifies the TRPV4 channel as playing a key role in translating mechanical signals from a baby's movement in the womb to healthy development of the skeleton. The channel could in the future form part of a therapy that would reduce the effects of reduced or restricted fetal movements on skeletal development in babies."

Fetal movements are a critical sign of a baby's health and development. Such movements are also important for development of the baby's bones and . When a baby doesn't move enough, or their movements are restricted in some way, the shapes of their joints don't form correctly, leading to conditions such as developmental dysplasia of the hip (where the hip joint is unstable or dislocated) or arthrogryposis, where multiple joints are angled abnormally.

Study reveals how mechanical forces drive skeletal development
Credit: Science Advances (2023). DOI: 10.1126/sciadv.ade2155

There is a link between the caused by fetal movements and the processes by which the skeleton takes its shape, but the mechanisms underlying this relationship are unknown.

The study found that a particular called TRPV4 (transient receptor potential cation subfamily V member 4) is involved in the response of the growing skeleton to the mechanical forces caused by fetal movements. The authors discovered this link by blocking activity of TRPV4 in embryonic mouse limbs, and showing that the normal response of the tissues to mechanical loading was eliminated.

The authors also showed that activation of TRPV4 by mechanical loading affects proliferation of cells and the production of matrix in the cartilage, both of which affect growth of the joint.

When the gene which codes for the TRPV4 protein is mutated, a range of different severe skeletal conditions can occur including lethal metatropic dysplasia, spondylometaphyseal dysplasia (dwarfism), and autosomal dominant brachyolmia.

This study is the first to demonstrate that TRPV4 activity in the developing skeleton is closely linked to the mechanical loading from fetal movements. The findings of this research indicate that TRPV4 may be a valuable target for future therapeutic disease modifying drugs for abnormalities of pediatric , particularly when are reduced or restricted.

More information: Nidal S. Khatib et al, Mechanoregulatory role of TRPV4 in prenatal skeletal development, Science Advances (2023). DOI: 10.1126/sciadv.ade2155

Journal information: Science Advances

Citation: Study reveals how mechanical forces drive skeletal development (2023, January 27) retrieved 23 March 2023 from https://phys.org/news/2023-01-reveals-mechanical-skeletal.html
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