Citation: | Liang Jingbing, Wang Pei, Feng Yanhai, et al. Effects of sodium butyrate on intestinal barrier of severe scald mice and the related mechanism[J]. Chin j Burns, 2020, 36(1): 48-53. DOI: 10.3760/cma.j.issn.1009-2587.2020.01.009 |
Objective To investigate the effects of sodium butyrate on intestinal barrier of the severe scald mice and the related mechanism. Methods Eighteen C57BL/6 female mice, aged eight to twelve weeks, were divided into sham scald group, pure scald group, and scald+ sodium butyrate group according to random number table, with 6 mice in each group. Back of each mouse in pure scald group and scald+ sodium butyrate group were immersed into 90 ℃ water for 9 s, causing full-thickness scald of 30% total body surface area, while back of each mouse in sham scald group were immersed into 37 ℃ water for 9 s, causing sham injury. All of the mice in 3 groups were intraperitoneally injected with 1 mL sterile lactated Ringer′s solution immediately after injury. Besides, mice in scald+ sodium butyrate group were intraperitoneally injected with 300 mg/kg sodium butyrate at 30 min before injury and immediately after injury, while mice in sham scald group and pure scald group were intraperitoneally injected with the same volume of sterile phosphate buffer solution. At post injury hour (PIH) 24, portal vein of mice in 3 groups was harvested, intestinal permeability was measured by fluorescin isothiocyanate-dextran fluorescence probe tracing method, then lileal tissue of mice in 3 groups was harvested, protein expressions of zonula occludens l (ZO-1), occludin, claudin-1, claudin-2, nucleotide-binding oligomerization domain-containing protein-like receptor family pyrin domain containing 3 (NLRP3), interleukin-1β (IL-1β), and IL-18 were detected by Western blotting, and distribution of ZO-1 in intestinal mucosa was observed by indirect immunofluorescence. Data were processed with one-way analysis of variance, least-significant difference test, and Bonferroni correction. Results (1) At PIH 24, the intestinal permeability of mice in sham scald group, pure scald group, and scald+ sodium butyrate group was 0.88±0.19, 2.62±0.48, 1.23±0.16, respectively. Compared with that in sham scald group, the intestinal permeability of mice in pure scald group was significantly elevated (
<0.01), while the intestinal permeability of mice in scald+ sodium butyrate group showed no obvious change (
>0.05). Compared with that in pure scald group, the intestinal permeability of mice in scald+ sodium butyrate group was significantly decreased (
<0.01). (2) At PIH 24, compared with those in sham scald group, the protein expressions of ZO-1, occludin, and claudin-1 of mice in pure scald group and scald+ sodium butyrate group were significantly decreased (
<0.05), while the protein expression of claudin-2 was significantly increased (
<0.05). At PIH 24, compared with those of pure scald group, the protein expressions of ZO-1 and occludin of mice in scald+ sodium butyrate group were significantly elevated (
<0.05), while the protein expression of claudin-2 was significantly decreased (
<0.05), the protein expression of claudin-1 showed no significant difference (
>0.05). (3) At PIH 24, compared with those in sham scald group, the protein expressions of NLRP3, IL-1β, and IL-18 of mice in pure scald group and scald+ sodium butyrate group were significantly increased (
<0.05). Compared with those of pure scald group, the protein expressions of NLRP3, IL-1β, and IL-18 of mice in scald+ sodium butyrate group were significantly decreased (
<0.05). (4) At PIH 24, ZO-1 in intestinal mucosa of mice in sham scald group was distributed smoothly, continuously and homogeneously along the membrane. ZO-1 in intestinal mucosa of mice in pure scald group was distributed unsmoothly with breaks. The distribution of ZO-1 in intestinal mucosa of mice in scald+ sodium butyrate group was ameliorated compared with that in pure scald group. Conclusions Sodium butyrate can inhibit the activation of NLRP3 inflammasome and decrease the production of IL-1β and IL-18 in intestinal mucosa of severe scald mice, which protects the intestinal barrier function by alleviating the alteration of tight junction protein expression and localization.
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