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Complement terminal pathway inhibition reduces peritoneal injuries in a rat peritonitis model

Kamegai, Naoki, Kim, Hangsoo, Suzuki, Yasuhiro, Fukui, Sosuke, Kojima, Hiroshi, Maruyama, Shoichi, Morgan, B. Paul ORCID:, Zelek, Wioleta Milena and Mizuno, Masashi 2023. Complement terminal pathway inhibition reduces peritoneal injuries in a rat peritonitis model. Clinical & Experimental Immunology 214 (2) , pp. 209-218. 10.1093/cei/uxad088
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Peritonitis and the resulting peritoneal injuries are common problems that prevent long-term peritoneal dialysis (PD) therapy in patients with end-stage kidney diseases. Previously, we have analyzed the relationship between the complement system and progression of peritoneal injuries associated with PD, particularly focusing on the early activation pathways and effects of the anaphylatoxins. We here utilized a novel mAb 2H2 that blocks assembly of the membrane attack complex (MAC) to investigate roles of the complement terminal pathway in PD-associated peritoneal injury. We intraperitoneally injected mAb 2H2 anti-C5b-7 (2.5 or 5 mg/rat) once or twice over the five-day course of the experiment to investigate the effects of inhibiting formation of MAC in a fungal rat peritonitis model caused by repeated intraperitoneal administration of zymosan after methylglyoxal pretreatment (Zy/MGO model). Rats were sacrificed on day 5 and macroscopic changes in both parietal and visceral peritoneum evaluated. Peritoneal thickness, the abundance of fibrinogen and complement C3 and MAC deposition in tissue and accumulation of inflammatory cells were pathologically assessed. The results showed that mAb 2H2, but not isotype control mAb, reduced peritoneal thickness and accumulation of inflammatory cells in a dose and frequency-dependent manner in the Zy/MGO model. These effects were accompanied by decreased C3, MAC, and fibrinogen deposition in peritoneum. In conclusion, in the rat Zy/MGO model, complement terminal pathway activation and MAC formation substantially contributed to development of peritoneal injuries, suggesting that MAC-targeted therapies might be effective in preventing development of peritoneal injuries in humans.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Publisher: Oxford University Press
ISSN: 0009-9104
Date of First Compliant Deposit: 13 October 2023
Date of Acceptance: 7 August 2023
Last Modified: 17 Jan 2024 01:02

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