Objective To investigate the regulatory effect of vitamin D on the HMGB1/RAGE pathway and adipokine levels in a mouse model of obesity and asthma.Methods This study was conducted at the Experimental Center of the Second Affiliated Hospital of Jiaxing University and the laboratory of Jiaxing University from February to September 2023.Thirty mice were marked with digital ear numbers and were randomly divided into five groups,with six mice in each group:Group Ⅰ(normal control group),Group Ⅱ(asthma group),Group Ⅲ(obesity and asthma group),Group Ⅳ(asthma+vitamin D group),and Group Ⅴ(obesity and asthma+vitamin D group).An obesity mouse model was induced using a high-fat diet,while an asthma mouse model was induced through sensitization via intraperitoneal injection of ovalbumin and aerosol inhalation.The vitamin D intervention consisted of continuous intragastric administration of vitamin D(1 mL/d)for 2 weeks.Blood levels of interleukin-4,interleukin-6,interleukin-10,adiponectin,and leptin were determined using the enzyme-linked immunosorbent assay method.The expression of genes encoding high mobility group protein B1(HMGB1)and the receptor for advanced glycation end products(RAGE)was detected using a quantitative reverse transcription polymerase chain reaction.All the obtained results were statistically analyzed using SPSS software.Results The white blood cell count in bronchoalveolar lavage fluid(BALF)of Group Ⅱ was(1.34±0.48)× 105/L,which was significantly lower than(4.07±0.14)×105/L in Group Ⅳ(t=-18.28,P＜0.001).The white blood cell count in BALF in Group Ⅲ was(9.61±0.91)× 105/L,which was significantly higher than(4.89±0.38)× 105/L in Group V(t=11.75,P＜0.001).The percentage of eosinophils in BALF of Group Ⅱwas(28.75±1.94)％,which was significantly higher than(11.51±1.99)％in Group Ⅳ(t=15.20,P＜0.001).The percentage of eosinophils in BALF of Group Ⅴ was(12.50±1.42)％,which was significantly lower than(29.80±1.96)％in Group Ⅲ(t=17.74,P＜0.001).The ELISA results demonstrated that serum levels of interleukin-4,interleukin-6,interleukin-17,interleukin-1β,immunoglobulin E,and tumor necrosis factor-α in Group Ⅴ were significantly lower than those in Group Ⅲ(t=15.24,9.65,2.26,5.83,10.86,2.50,all P＜0.001).The serum level of interleukin-10 in Group Ⅲ was(4.97±0.25)pg/mL,which was significantly lower than(8.84±0.64)pg/mL in Group V(t=-13.89,P＜0.001).The serum level of adiponectin in Group Ⅴ was(1.95±0.85)mg/L,which was significantly higher than(1.15±0.13)mg/L in Group Ⅲ(t=-12.67,P＜0.001).The HMGB1 expression level in lung tissue of Group Ⅳ was 1.42±0.09,which was significantly lower than 1.91±0.16 in Group Ⅱ(t=6.55,P＜0.001).The expression level of RAGE mRNA in lung tissue in Group Ⅳwas 1.35±0.11,which was significantly lower than 1.55±0.152 in Group Ⅱ(t=4.19,P＜0.05).The expression level of HMGB1 in lung tissue in Group Ⅴ was 1.51±0.10,which was significantly lower than 2.44±0.10 in Group Ⅲ(t=1.02,P＜0.001).Conclusion Vitamin D may alleviate lung injury by up-regulating the expression of HMGB1 and RAGE in a mouse model of obesity and asthma.This provides a new concept and method for the treatment and prevention of obesity and asthma.
AsthmaMice,obeseVitamin DHigh mobility group proteinsAdvanced glycosylation end product-specific receptor
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