Cited by 541Bone fractures and treatmentsBone Tissue Engineering MaterialsBone Metabolism and Diseases

Modulation of the Inflammatory Response and Bone Healing

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Maruyama, Masahiro, Rhee, Claire, Utsunomiya, Takeshi, Zhang, Ning, Ueno, Masaya, Yao, Zhenyu, Goodman, Stuart B.·2020·Frontiers in Endocrinology

Abstract

The optimal treatment for complex fractures and large bone defects is an important unsolved issue in orthopedics and related specialties. Approximately 5-10% of fractures fail to heal and develop non-unions. Bone healing can be characterized by three partially overlapping phases: the inflammatory phase, the repair phase, and the remodeling phase. Eventual healing is highly dependent on the initial inflammatory phase, which is affected by both the local and systemic responses to the injurious stimulus. Furthermore, immune cells and mesenchymal stromal cells (MSCs) participate in critical inter-cellular communication or crosstalk to modulate bone healing. Deficiencies in this inter-cellular exchange, inhibition of the natural processes of acute inflammation, and its resolution, or chronic inflammation due to a persistent adverse stimulus can lead to impaired fracture healing. Thus, an initial and optimal transient stage of acute inflammation is one of the key factors for successful, robust bone healing. Recent studies demonstrated the therapeutic potential of immunomodulation for bone healing by the preconditioning of MSCs to empower their immunosuppressive properties. Preconditioned MSCs (also known as "primed/ licensed/ activated" MSCs) are cultured first with pro-inflammatory cytokines (e.g., TNFα and IL17A) or exposed to hypoxic conditions to mimic the inflammatory environment prior to their intended application. Another approach of immunomodulation for bone healing is the resolution of inflammation with anti-inflammatory cytokines such as IL4, IL10, and IL13. In this review, we summarize the principles of inflammation and bone healing and provide an update on cellular interactions and immunomodulation for optimal bone healing.

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  • Excessive acute and chronic inflammation leads to a persistent inflammatory state and excessive production of pro-inflammatory cytokines, which results in increased bone resorption and suppression of bone formation.

    “Excessive acute and chronic inflammation, caused by microbial infection, trauma, and autoimmune diseases, etc. lead to the persistent inflammatory state and excessive production of pro-inflammatory cytokines [47], which in turn, resulting in increased bone resorption and suppression of bone formation [47].”

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Research works printed but not linked: 2

  1. [4]Pahwa R Jialal I Chronic Inflammation. Internet: StatPearls Publishing (2019). 29630225
  2. [106]Zhang J Feng Z Wei J Yu Y Luo J Zhou J. Repair of critical-sized mandible defects in aged rat using hypoxia preconditioned BMSCs with up-regulation of Hif-1α. Int J Biol Sci. (2018) 14: 449– 60. 10.7150/ijbs.24158 29725266 PMC5930477 · DOI

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Authors
Maruyama, M., Rhee, C., Utsunomiya, T., Zhang, N., Ueno, M., Yao, Z., & Goodman, S. B.
Affiliations
Stanford University (US)
Corresponding author
Goodman, Stuart B.
Venue
Frontiers in Endocrinology
Published
2020-06-11
Volume
11
Pages
386-386
ISSN
1664-2392 (ISSN-L)
OpenAlex
W3034944990
Cited by
541
References
125
Citations by year
2026: 99 · 2025: 128 · 2024: 107 · 2023: 102 · 2022: 65 · 2021: 36 · 2020: 4
FWCI
7.56
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Endocrinology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
Foundation for the National Institutes of Health (R01AR055650, R01AR063717, R01AR073145, RO1AR72613)
Topics
  • Health Sciences › Medicine › Epidemiology › Bone fractures and treatments
  • Physical Sciences › Engineering › Biomedical Engineering › Bone Tissue Engineering Materials
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
Keywords
bone regeneration, fracture healing, nonunion, acute inflammation, chronic inflammation, immunomodulation, mesenchymal stem cells, inflammatory cytokines, hypoxia, anti-inflammatory cytokines, inflammation resolution, bone defects
MeSH terms
Animals, Bone and Bones, Humans, Inflammation, Fracture Healing, Inflammation Mediators, Fractures, Bone, Mesenchymal Stem Cells

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