Diabetes Impact on Bone Health and Fracture Mechanics

Diabetes mellitus exerts profound effects on skeletal integrity, compromising both bone quality and the mechanical processes that underlie fracture resistance and healing. In type 1 diabetes, reduced bone mass arises from insulin deficiency and impaired osteoblast activity, whereas type 2 diabetes often presents with normal or increased bone mineral density yet reveals inferior bone microarchitecture and material properties. Chronic hyperglycaemia drives accumulation of advanced glycation end products within collagen networks, weakening the organic matrix and impairing mechanotransduction by osteocytes. Abnormalities in osteoblast differentiation, enhanced osteoblast apoptosis and dysregulated osteoclast formation further disrupt bone remodelling. At the fracture site, diabetes hinders angiogenesis, delays callus formation, perturbs primary cilia function in osteoblasts and alters the local immune milieu, collectively prolonging healing and reducing mechanical strength. These pathophysiological changes heighten fracture risk globally and underscore the need for novel assessment tools and targeted interventions to preserve skeletal health in people living with diabetes.

Research from Nature Portfolio

Recent studies have elucidated how type 2 diabetes compromises bone mechano-responsiveness by impairing osteocyte calcium dynamics. Under cyclic mechanical loading, diabetic bone fails to adapt due to PPARα-mediated downregulation of the sarcoendoplasmic reticulum Ca2+-ATPase pump SERCA2 in osteocytes. This deficit blunts intracellular Ca2+ oscillations and disrupts communication with osteoblasts and osteoclasts. Pharmacological activation of SERCA2 with the agonist istaroxime restores osteocytic Ca2+ signalling, improves bone architecture and strength, and rebalances remodelling cell activity. Moreover, genetic overexpression of osteocytic SERCA2 in diabetic models preserves mechano-responsiveness, identifying osteocyte calcium handling as a promising therapeutic target for prevention of fragility fractures in diabetes.

Diabetes Impact on Bone Health and Fracture Mechanics publication trend

The graph below shows the total number of articles in diabetes impact on bone health and fracture mechanics across all publications each year (not limited to Nature Index journals).

Technical terms

Advanced glycation end products (AGEs): irreversible glucose-derived protein modifications that stiffen bone collagen and impair matrix integrity.

Osteocyte: mature bone cell embedded within the mineralised matrix that senses mechanical load and orchestrates remodelling.

Sarcoendoplasmic reticulum Ca2+-ATPase pump (SERCA2): calcium-transport protein in osteocytes essential for intracellular Ca2+ signalling and mechanotransduction.

Ciliogenesis: the formation of primary cilia on the cell surface, crucial for mechanosensory and signalling functions in osteoblasts.

Osteoclast: specialised multinucleated cell responsible for bone matrix resorption during remodelling.

Osteoblast: bone-forming cell that synthesises and mineralises new matrix.

Mechanotransduction: conversion of mechanical forces into biochemical signals that regulate bone formation and resorption.

References

1. Rescuing SERCA2 pump deficiency improves bone mechano-responsiveness in type 2 diabetes by shaping osteocyte calcium dynamics. Nature Communications (2024).
2. Single-cell RNA sequencing reveals a distinct profile of bone immune microenvironment and decreased osteoclast differentiation in type 2 diabetic mice. Genes & Diseases (2023).
3. Diabetes impairs fracture healing through Foxo1 mediated disruption of ciliogenesis. Cell Death Discovery (2023).
4. Impact of Diabetes Mellitus on Bone Health. International Journal of Molecular Sciences (2019).
5. The Impact of Type 2 Diabetes on Bone Fracture Healing. Frontiers in Endocrinology (2018).
6. Accelerated osteocyte senescence and skeletal fragility in mice with type 2 diabetes. JCI Insight (2020).