Calcified Tissue International

, Volume 102, Issue 5, pp 512–521 | Cite as

From Osteoimmunology to Osteomicrobiology: How the Microbiota and the Immune System Regulate Bone

Review

Abstract

Osteomicrobiology refers to the role of microbiota in bone health and the mechanisms by which the microbiota regulates post-natal skeletal development, bone aging, and pathologic bone loss. Here, we review recent reports linking gut microbiota to changes in bone phenotype. A pro-inflammatory cytokine milieu drives bone resorption in conditions such as sex steroid hormone deficiency. The response of the immune system to activation by the microbiome results in increased circulating osteoclastogenic cytokines in a T cell-dependent mechanism. Additionally, gut microbiota affect bone homeostasis through nutrient absorption, mediation of the IGF-1 pathway, and short chain fatty acid and metabolic products. Manipulation of microbiota through prebiotics or probiotics reduces inflammatory cytokine production, leading to changes in bone density. One mechanism of probiotic action is through upregulating tight junction proteins, increasing the strength of the gut epithelial layer, and leading to less antigen presentation and less activation of intestinal immune cells. Thus, prebiotics or probiotics may represent a future therapeutic avenue for ameliorating the risk of postmenopausal bone loss in humans.

Keywords

Estrogen Sex steroids Microbiota Intestine Bone loss Probiotics LGG VSL#3™ 

Abbreviations

BM

Bone marrow

GF

Germ-Free

Conv.R

Conventionally raised

TNF

Tumor necrosis factor α

Notes

Compliance with Ethical Standards

Conflict of interest

Emory Hsu and Roberto Pacifici have declared that they have no conflict of interest.

Human and Animal Rights and Informed Consent

All the animal procedures were approved by the Institutional Animal Care and Use Committee of Emory University.

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Division of Endocrinology, Metabolism and Lipids, Department of MedicineEmory UniversityAtlantaUSA
  2. 2.Immunology and Molecular Pathogenesis ProgramEmory UniversityAtlantaUSA

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