Ultrastructural Evidence of Mitochondrial Dysfunction in Osteomyelitis Patients

Author:

Mendelsohn Daniel H.123,Niedermair Tanja12,Walter Nike3ORCID,Alt Volker3ORCID,Rupp Markus3ORCID,Brochhausen Christoph124

Affiliation:

1. Institute of Pathology, University Regensburg, 93053 Regensburg, Germany

2. Central Biobank Regensburg, University Regensburg, University Hospital Regensburg, 93053 Regensburg, Germany

3. Department of Trauma Surgery, University Medical Centre Regensburg, 93053 Regensburg, Germany

4. Institute of Pathology, University Medical Centre Mannheim, 68167 Mannheim, Germany

Abstract

Osteomyelitis is a difficult-to-treat disease with high chronification rates. First studies suggest increases in mitochondrial fission and mitochondrial dysfunction as possible contributors to the accumulation of intracellular reactive oxygen species and thereby to the cell death of infected bone cells. The aim of the present study is to analyze the ultrastructural impact of bacterial infection on osteocytic and osteoblastic mitochondria. Human infected bone tissue samples were visualized via light microscopy and transmission electron microscopy. Osteoblasts, osteocytes and their mitochondria were analyzed histomorphometrically and compared with the control group of noninfectious human bone tissue samples. The results depicted swollen hydropic mitochondria including depleted cristae and a decrease in matrix density in the infected samples. Furthermore, perinuclear clustering of mitochondria could also be observed regularly. Additionally, increases in relative mitochondrial area and number were found as a correlate for increased mitochondrial fission. In conclusion, mitochondrial morphology is altered during osteomyelitis in a comparable way to mitochondria from hypoxic tissues. This gives new perspectives on the treatment strategies since the manipulation of mitochondrial dynamics may improve bone cell survival as a potential new target for the therapy of osteomyelitis.

Funder

University of Regensburg

Publisher

MDPI AG

Subject

Inorganic Chemistry,Organic Chemistry,Physical and Theoretical Chemistry,Computer Science Applications,Spectroscopy,Molecular Biology,General Medicine,Catalysis

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