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Osteologie 2016; 25(02): 83-91
DOI: 10.1055/s-0037-1619007
Osteozyt: Funktion & Morphologie
Schattauer GmbH

Synchrotron-Nano-Tomografie mit Phasenkontrast

Eine neue Dimension in der Analyse von Osteozytenlakunen, Kanalikuli und der extrazellulären KnochenmatrixSynchrotron radiation nanotomography with phase contrastA new dimension in the analysis of the osteocyte lacuno-canalicuar network and the extracellular bone matrix
B. Hesse
1   European Synchrotron Radiation Facility, Grenoble, Frankreich
,
P. Varga
2   AO Research Institute Davos, Davos, Schweitz
,
S. Schrof
3   Berlin-Brandenburg School for Regenerative Therapies, Charité – Universitätsmedizin Berlin, Berlin, Deutschland
,
N. Männicke
3   Berlin-Brandenburg School for Regenerative Therapies, Charité – Universitätsmedizin Berlin, Berlin, Deutschland
,
A. Pacureanu
1   European Synchrotron Radiation Facility, Grenoble, Frankreich
,
M. Langer
1   European Synchrotron Radiation Facility, Grenoble, Frankreich
,
H. Suhonen
1   European Synchrotron Radiation Facility, Grenoble, Frankreich
,
P. Maurer
5   Klinik für Mund-, Kieferund Gesichtschirurgie, Klinikum Bremerhaven-Reinkenheide, Bremerhaven, Deutschland
,
P. Cloetens
1   European Synchrotron Radiation Facility, Grenoble, Frankreich
,
F. Peyrin
4   Université de Lyon, CREATIS, CNRS UMR5220, Inserm U1044, INSA-Lyon, Lyon, Frankreich
,
K. Raum
3   Berlin-Brandenburg School for Regenerative Therapies, Charité – Universitätsmedizin Berlin, Berlin, Deutschland
› Author Affiliations
Further Information

Publication History

eingereicht: 25 February 2016

angenommen: 06 March 2016

Publication Date:
22 December 2017 (online)

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Zusammenfassung

Gesunder humaner Knochen unterliegt einem permanenten Umbau, um sich den mechanischen Anforderungen anzupassen, Mikrofrakturen zu reparieren und das Mineralgleichgewicht zu erhalten. Der Umbauprozess der extrazellulären Matrix wird durch Osteoblasten und Osteoklasten realisiert. Eine bedeutende Rolle bei der Regulierung der Osteoklasten- und Osteoblastenaktivität wird den Osteozyten zugesprochen, welche in einem komplexen Netzwerk von Zelllakunen und Kanalikuli die extrazelluläre Matrix durchsetzen. Auf Phasenkontrast basierende hochauflösende Nano-Computertomografie erlaubt erstmals, sowohl das Zellnetzwerk als auch die direkt angrenzende mineralisierte Matrix in Untersuchungsvolumen, die hinsichtlich ihrer Größe als repräsentativ angesehen werden können, im nativen Zustand (nicht demineralisiert, nicht eingebettet) zu untersuchen.

Summary

Healthy human bone tissue undergoes a continuous remodeling process to i) repair microdamages, ii) adapt to mechanical boundary conditions, and iii) maintain a constant serum calcium level. Bone remodeling is realized by specialized bone synthesizing and resorbing cells, i. e. osteoblasts and osteoclasts, respectively. Osteocytes play an important role in the regulation of osteoblast and osteoclast activities. Osteocytes are embedded in the extracellular matrix in a complex porous lacunar-canalicular network (LCN). Recently developed high-fidelity phase-contrast nanotomography with synchrotron radiation x-ray sources enabled for the first time the simultaneous assessment of both, LCN and the adjacent extracellular mineralized matrix in close-to-native sample conditions.

Schlüsselwörter

Synchrotron - Osteozyt - Lakune - Kanalikuli - extrazelluläre Matrix - Mineralisierung - Nano-Tomografie - Phasenkontrast

Keywords

Synchrotron - osteocyte - lacuna - canaliculi - extracellular matrix - mineralisation - nano-tomography - phase-contrast
 

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