Regulation of the intestinal flora using polysaccharides from Callicarpa nudiflora Hook to alleviate ulcerative colitis and the molecular mechanisms involved

Qin, Xinyun; Nong, Keyi; Liu, Zhineng; Fang, Xin; Zhang, Bin; Chen, Wanyan; Wang, Zihan; Wu, Yijia; Shi, Huiyu; Wang, Xuemei; Zhang, Haiwen

doi:10.1016/j.ijbiomac.2023.128887

Cited by 5 publications

(1 citation statement)

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“…Radix Puerariae lobatae polysaccharides (molecular weight: 10.43 kDa) had a strong free radical scavenging ability in vitro, and enhanced the hepatic antioxidant capacity and inhibited the release of pro-inflammatory factors in alcoholic liver disease mice [52]. Callicarpa nudiflora Hook polysaccharides (molecular weight: 31.38 kDa) inhibited intestinal inflammation in ulcerative colitis mice by affecting the nf-κb/mapk pathway [53]. Regarding the monosaccharide composition [5], the molar mass of arabinose and galactose following MLP hydrolysis in our experiment was higher than that of the other monosaccharides.…”

Section: Discussionmentioning

confidence: 99%

Mulberry Leaf Polysaccharides Attenuate Oxidative Stress Injury in Peripheral Blood Leukocytes by Regulating Endoplasmic Reticulum Stress

Jiang,

Lin,

Qian

et al. 2024

Antioxidants

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The present study assessed the protective effects and underlying mechanisms of mulberry leaf polysaccharides (MLPs) against hydrogen peroxide (H2O2)-induced oxidative stress injury in the peripheral blood leukocytes (PBLs) of Megalobrama amblycephala. Five treatment groups were established in vitro: the NC group (PBLs incubated in an RPMI-1640 complete medium for 4 h), the HP group (PBLs incubated in an RPMI-1640 complete medium for 3 h, and then stimulated with 100 μM of H2O2 for 1 h), and the 50/100/200-MLP pre-treatment groups (PBLs were pre-treated with MLPs (50, 100, and 200 μg/mL) for 3 h, and then stimulated with 100 μM of H2O2 for 1 h). The results showed that MLP pre-treatment dose-dependently enhanced PBLs’ antioxidant capacities. The 200 μg/mL MLP pre-treatment effectively protected the antioxidant system of PBLs from H2O2-induced oxidative damage by reducing the malondialdehyde content and lactic dehydrogenase cytotoxicity, and increasing catalase and superoxide dismutase activities (p < 0.05). The over-production of reactive oxygen species, depletion of nicotinamide adenine dinucleotide phosphate, and collapse of the mitochondrial membrane potential were significantly inhibited in the 200-MLP pre-treatment group (p < 0.05). The expressions of endoplasmic reticulum stress-related genes (forkhead box O1α (foxO1α), binding immunoglobulin protein (bip), activating transcription factor 6 (atf6), and C/EBP-homologous protein (chop)), Ca2+ transport-related genes (voltage-dependent anion-selective channel 1 (vdac1), mitofusin 2 (mfn2), and mitochondrial Ca2+ uniporter (mcu)), and interleukin 6 (il-6) and bcl2-associated x (bax) were significantly lower in the 200-MLP pre-treatment group than in the HP group (p < 0.05), which rebounded to normal levels in the NC group (p > 0.05). These results indicated that MLP pre-treatment attenuated H2O2-induced PBL oxidative damage in the M. amblycephala by inhibiting endoplasmic reticulum stress and maintaining mitochondrial function. These findings also support the possibility that MLPs can be exploited as a natural dietary supplement for M. amblycephala, as they protect against oxidative damage.

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Section: Discussionmentioning

confidence: 99%