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Implication of Nrf2/HO-1 pathway in the coloprotective effect of coenzyme Q10 against experimentally induced ulcerative colitis

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Abstract

Purpose

Given the increased incidence of ulcerative colitis worldwide, the current study was designed to investigate the coloprotective potential of CoQ10 against experimentally induced ulcerative colitis (UC) and specify the implicated mechanisms.

Methods

Ulcerative colitis was induced by intracolonic instillation of [2 ml, 3% v/v acetic acid (AA)]. Rats in the different experimental groups received CoQ10 (10 or 30 and 100 mg/kg, orally) for eight consecutive days, either in a protective or curative regimen.

Results

Intracolonic AA instillation significantly increased colon/body weight index, colon weight/colon length ratio, clinical evaluation and macroscopic scoring of UC, serum LDH, C-reactive protein and decreased the serum total antioxidant capacity. Colon MDA, TNF-α and calcium content significantly increased as well, with concomitant reduction in colon GSH, SOD, CAT, Nrf2 and HO-1 contents. Moreover, immunohistochemical staining of colon specimen revealed increased expression of caspase-3 with significant histopathological changes. Coenzyme Q10 suppressed the release of inflammatory biomarkers and restored oxidants/antioxidants hemostasis. In a dose-dependent manner, CoQ10 significantly decreased colon/body weight index, colon weight/colon length ratio, clinical evaluation and macroscopic scoring of UC, serum LDH, C-reactive protein, colon MDA, TNF-α, caspase-3 expression and increased the serum total antioxidant capacity. Colon GSH, SOD, CAT, Nrf2 and HO-1 contents significantly increased. Moreover, coenzyme Q10 significantly preserved tissue histopathological architecture. It appears that the coloprotective effect of CoQ10 was calcium-independent.

Conclusion

Coenzyme Q10 dose-dependently protects against AA-induced UC mainly via modulation of Nrf2/HO-1 and caspase-3 pathways. Antioxidant, anti-inflammatory and anti-apoptotic properties of CoQ10 are implicated in its observed therapeutic benefit.

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Correspondence to Eman Said.

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Khodir, A.E., Atef, H., Said, E. et al. Implication of Nrf2/HO-1 pathway in the coloprotective effect of coenzyme Q10 against experimentally induced ulcerative colitis. Inflammopharmacol 25, 119–135 (2017). https://doi.org/10.1007/s10787-016-0305-0

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