Interleukin-1 beta and cathepsin D modulate formation of the terminal complement complex in cultured human disc tissue

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Teixeira, GQ (Author) Other; Yong, ZY (Author) Other; Kuhn, A (Author) Other; Riegger, J (Author) Other; Goncalves, RM (Author) ICBAS; Ruf, M (Author) Other; Mauer, UM (Author) Other; Huber Lang, M (Author) Other; Ignatius, A (Author) Other; Brenner, RE (Author) Other; Neidlinger Wilke, C (Author) Other

Journal

Title: European Spine Journal

Vol. 30

Pages: 2247-2256

ISSN: 0940-6719

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 11 Citations

Scopus - 11 Citations

Other information

Authenticus ID: P-00V-40J

DOI: 10.1007/s00586-021-06901-5

Abstract (EN): Purpose Formation of terminal complement complex (TCC), a downstream complement system activation product inducing inflammatory processes and cell lysis, has been identified in degenerated discs. However, it remains unclear which molecular factors regulate complement activation during disc degeneration (DD). This study investigated a possible involvement of the pro-inflammatory cytokine interleukin-1 beta (IL-1 beta) and the lysosomal protease cathepsin D (CTSD). Methods Disc biopsies were collected from patients suffering from DD (n = 43) and adolescent idiopathic scoliosis (AIS, n = 13). Standardized tissue punches and isolated cells from nucleus pulposus (NP), annulus fibrosus (AF) and endplate (EP) were stimulated with 5% human serum (HS) alone or in combination with IL-1 beta, CTSD or zymosan. TCC formation and modulation by the complement regulatory proteins CD46, CD55 and CD59 were analysed. Results In DD tissue cultures, IL-1 beta stimulation decreased the percentage of TCC + cells in AF and EP (P < 0.05), whereas CTSD stimulation significantly increased TCC deposition in NP (P < 0.01) and zymosan in EP (P < 0.05). Overall, the expression of CD46, CD55 and CD59 significantly increased in all isolated cells during culture (P < 0.05). Moreover, cellular TCC deposition was HS concentration dependent but unaffected by IL-1 beta, CTSD or zymosan. Conclusion These results suggest a functional relevance of IL-1 beta and CTSD in modulating TCC formation in DD, with differences between tissue regions. Although strong TCC deposition may represent a degeneration-associated event, IL-1 beta may inhibit it. In contrast, TCC formation was shown to be triggered by CTSD, indicating a multifunctional involvement in disc pathophysiology.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10