卡巴胆碱对肠上皮细胞氧化损伤的保护作用

Carbachol alleviates oxygen free radical injury in gut during enteral resuscitation of burn shock in rats

AIM: To investigate the effects of carbachol on oxygen free radical injury in gut during enteral resuscitation of burn shock in rats.

METHODS: A 35% TBSA full thickness scald injury was induced in 38 Wistar rats. The rats were divided randomly into four groups: scald with no therapy (scald alone, n = 8), scald with enteral infusing either a glucose electrolyte solution (GES, n = 10) or GES containing carbachol (60 μg/kg, GES/CAR, n = 10), and scald with enteral infusing only carbachol (CAR, n = 10). GES was infused into intestine through a duodenal stomy according to Parkland formula (4 mL·1%TBSA/kg) 30 min after scald and carbachol was administered simultaneously through the same path. Four hours after injury, the initial jejunum was collected for evaluation of xanthine oxidase (XOD), malondialdehyde (MDA), myeloperoxidase (MPO) and assessment of the pathologic damages.

RESULTS: The activity of XOD and MPO, and the MDA level were 13.2%, 21.3% and 21.1% higher in the GES containing carbachol treatment groups than in the scald alone group (P < 0.05). Resuscitation with GES/CAR resulted in significantly lower levels of XOD (1.36 ± 0.37 vs 2.51 ± 0.56, P < 0.01), MDA (3.97 ± 1.57 vs 6.59 ± 1.50, P < 0.01) and MPO (0.47 ± 0.14 vs 0.83 ± 0.21, P < 0.01) than resuscitation with GES. The parameters in the CAR group were the lowest. The gut lesions were mild in the CAR and GES/CAR groups, severe in the CAR alone group, and most severe in the GES group.

CONCLUSION: Carbachol can alleviate gut oxygen free radical injury during enteral resuscitation of burn shock, which might be associated with its anti-inflammation effects, inhibition of XOD activity and generation of oxygen free radicals in gut tissue.