Osteogenic differentiation of bone marrow stromal cells is hindered by the presence of intervertebral disc cells.

Chan, Samantha C W; Tekari, Adel; Benneker, Lorin Michael; Heini, Paul Ferdinand; Gantenbein, Benjamin (2015). Osteogenic differentiation of bone marrow stromal cells is hindered by the presence of intervertebral disc cells. Arthritis research & therapy, 18(1), p. 29. BioMed Central 10.1186/s13075-015-0900-2

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BACKGROUND Clinical observations indicate that the presence of nucleus pulposus (NP) tissue during spinal fusion hinders the rate of disc ossification. While the underlying mechanism remains unknown, this observation could be due to incomplete removal of NP cells (NPCs) that secrete factors preventing disc calcification, such as bone morphogenetic protein (BMP) antagonists including noggin and members of the DAN (differential screening selected gene aberrative in neuroblastoma) family. METHODS Monolayer human bone marrow-derived mesenchymal stem cells (MSCs) were cocultured withNPCs and annulus fibrosus cells (AFCs) embedded in alginate for 21 days. At the end of coculture, MSCs were stained for mineral deposition by alizarin red, and relative expression of bone-related genes [Runt-related transcription factor 2, (RUNX2), Osteopontin (OPN), and Alkaline phosphatase (ALP)] and ALP activity were analyzed. Relative expression of three BMP antagonists, chordin (CHRD), gremlin (GREM1), and noggin (NOG), was determined in primary human NPCs and AFCs. These cells were also stained for Gremlin and Noggin by immunocytochemistry. RESULTS Alizarin red staining showed that MSC osteogenesis in monolayer cultures was inhibited by coculture with NPCs or AFCs. ALP activity and RT-PCR analyses confirmed these results and demonstrated inhibition of osteogenesis of MSC in the presence of disc cells. NOG was significantly up-regulated in MSCs after coculture. Relative gene expression of intervertebral disc (IVD) cells showed higher expression of GREM1 in NPCs than in AFCs. CONCLUSIONS We show that primary IVD cells inhibit osteogenesis of MSCs. BMP inhibitors NOG, GREM1 and CHRD were expressed in IVD cells. GREM1 appears to be differentially expressed in NPCs and AFCs. Our results have implications for the design and development of treatments for non-union in spinal fusion.

Item Type:

Journal Article (Original Article)

Division/Institute:

?? DCD5A442C2F3E17DE0405C82790C4DE2 ??
04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Surgical Technology & Biomechanics ISTB
04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Orthopaedic Surgery

UniBE Contributor:

Tekari, Adel; Benneker, Lorin Michael; Heini, Paul Ferdinand and Gantenbein, Benjamin

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

1478-6354

Publisher:

BioMed Central

Language:

English

Submitter:

Benjamin Gantenbein

Date Deposited:

23 Feb 2016 16:23

Last Modified:

07 Apr 2016 16:04

Publisher DOI:

10.1186/s13075-015-0900-2

PubMed ID:

26809343

BORIS DOI:

10.7892/boris.75823

URI:

https://boris.unibe.ch/id/eprint/75823

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