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Site-Directed Immobilization of Bone Morphogenetic Protein 2 to Solid Surfaces by Click Chemistry

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L-BAIBA Synergizes with Sub-Optimal Mechanical Loading to Promote New Bone Formation.

Matt Prideaux¹, Alberto Smargiassi¹, Gang Peng²

¹Indiana Center for Musculoskeletal Health, Department of Anatomy, Cell Biology and Physiology, School of Medicine Indiana University Indianapolis IN USA.

|June 7, 2023

Summary

This summary is machine-generated.

The muscle-secreted factor L-BAIBA (β-aminoisobutyric acid) enhances bone formation when combined with sub-optimal mechanical loading. This finding is relevant for individuals unable to perform optimal exercise.

Keywords:

ANALYSIS/QUANTITATION OF BONE BONE HISTOMORPHOMETRY BONE‐MUSCLE INTERACTIONS CELLS OF BONE OSTEOCYTES SYSTEMS BIOLOGY‐BONE INTERACTORS

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Area of Science:

Biochemistry
Bone Biology
Exercise Physiology

Background:

L-enantiomer of β-aminoisobutyric acid (L-BAIBA) is released by muscle during exercise.
L-BAIBA reduces bone loss during unloading in mice.
The effect of L-BAIBA on bone formation during mechanical loading is unknown.

Purpose of the Study:

To investigate if L-BAIBA can enhance bone formation in synergy with sub-optimal mechanical loading.
To explore the molecular mechanisms underlying the potential synergistic effects.

Main Methods:

C57Bl/6 male mice received L-BAIBA in drinking water.
Mice were subjected to sub-optimal unilateral tibial loading (7 N or 8.25 N) for two weeks.
Periosteal bone formation, grip strength, and gene expression in osteocytes were analyzed.

Main Results:

The combination of 8.25 N loading and L-BAIBA significantly increased bone formation rates (periosteal mineral apposition rate and bone formation rate).
L-BAIBA alone did not affect bone formation but improved grip strength, indicating a positive effect on muscle function.
Gene expression analysis revealed that L-BAIBA and loading synergistically induced genes involved in Wnt, TGFβ, and BMP signaling pathways, extracellular matrix formation, ion channel activity, and lipid metabolism.

Conclusions:

L-BAIBA potentiates the anabolic effects of sub-optimal mechanical loading on bone.
The synergistic effects involve the modulation of specific signaling pathways and metabolic processes in osteocytes.
This muscle-derived factor may offer therapeutic potential for bone health in individuals with limited exercise capacity.