局部注射脂多糖对兔母兔子宫和输卵管中Toll样受体4及促炎细胞因子表达的影响。

Effects of local lipopolysaccharide administration on the expression of Toll-like receptor 4 and pro-inflammatory cytokines in uterus and oviduct of rabbit does.

作者信息

Menchetti Laura, Barbato Olimpia, Filipescu Iulia Elena, Traina Giovanna, Leonardi Leonardo, Polisca Angela, Troisi Alessandro, Guelfi Gabriella, Piro Federica, Brecchia Gabriele

机构信息

Department of Veterinary Medicine, University of Perugia, Perugia, Italy.

Department of Pharmaceutical Science, University of Perugia, Perugia, Italy.

出版信息

Theriogenology. 2018 Feb;107:162-174. doi: 10.1016/j.theriogenology.2017.10.046. Epub 2017 Nov 5.

Abstract

Inflammation of the uterus and oviduct is associated with reduced reproductive performance in humans and domestic animals. Toll-like receptors are expressed in various immune and non-immune cells and play a crucial role in innate immunity. Toll-like receptor - 4 (TLR4) can detect lipopolysaccharide (LPS) from Gram-negative bacteria leading to the secretion of pro-inflammatory cytokines, chemokines, antimicrobial peptides and other inflammatory mediators. To investigate the effects of a local inflammation on the expression levels of TLR4 and pro-inflammatory cytokines, 12 female rabbits received an intracervical infusion with either saline solution endotoxin-free (carrier, 2 mL; n = 6) or LPS (500 μg diluted in 2 mL of saline solution; n = 6). Blood samples were performed at 0, 30, 60 and 90 min and 2,4,6 and 24 h after treatment to evaluate interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) plasma concentrations. Animals were sacrificed 24 h post-treatment. The uterus and oviducts were immediately collected. The gene expression and protein levels of TLR4 and pro-inflammatory cytokines were detected by quantitative real-time PCR (qRT-PCR) and immuno-histochemical assay, respectively. Our study showed that the intracervical administration of LPS induced local inflammation given that the animals showed no clinical signs, the histological samples revealed signs of inflammation and plasma levels of pro-inflammatory cytokines were unchanged compared to the control. LPS produced an increase in the TLR4 mRNA expression levels in the uterus with respect to the control (P < 0.05). In LPS-treated rabbits the gene expression of IL-1β was higher in the uterus and oviducts and TNF-α only in the oviduct (P < 0.05) as compared to the control. The immuno-histochemical assay showed that TLR4, IL-1β and TNF-α were expressed in the reproductive tissues of the rabbit. Moreover, after the LPS stimulation the stromal cells of the uterus exhibited a higher staining for TLR4 (P < 0.05) and the epithelial cells of the oviduct for TNF-α and IL-1β (P < 0.05) with respect to the control. These results suggest that (1) TRL4, IL-1β and TNF-α are expressed in uterus and oviducts of the doe, and (2) LPS up-regulates the gene and protein expression of TLR4 and pro-inflammatory cytokines in uterus and oviducts. Therefore, the rabbit could be a useful animal model for studying the local mechanisms involved in reproductive dysfunctions caused by subclinical infections.

摘要

子宫和输卵管炎症与人类和家畜的生殖性能下降有关。Toll样受体在各种免疫和非免疫细胞中表达,在先天免疫中起关键作用。Toll样受体-4(TLR4)可检测革兰氏阴性菌的脂多糖(LPS),导致促炎细胞因子、趋化因子、抗菌肽和其他炎症介质的分泌。为了研究局部炎症对TLR4和促炎细胞因子表达水平的影响,12只雌性兔子接受了宫颈内输注,其中6只输注无内毒素的盐溶液(载体,2 mL),另外6只输注LPS(500 μg溶于2 mL盐溶液中)。在治疗后0、30、60和90分钟以及2、4、6和24小时采集血样,以评估血浆中白细胞介素-1β(IL-1β)和肿瘤坏死因子-α(TNF-α)的浓度。治疗后24小时处死动物。立即采集子宫和输卵管。分别通过定量实时PCR(qRT-PCR)和免疫组织化学测定法检测TLR4和促炎细胞因子的基因表达和蛋白水平。我们的研究表明,宫颈内给予LPS可诱导局部炎症,因为动物未表现出临床症状,组织学样本显示有炎症迹象,且与对照组相比,促炎细胞因子的血浆水平未发生变化。与对照组相比,LPS使子宫中TLR4 mRNA表达水平升高(P < 0.05)。与对照组相比,在LPS处理的兔子中,子宫和输卵管中IL-1β的基因表达较高,而TNF-α仅在输卵管中表达较高(P < 0.05)。免疫组织化学测定显示,TLR4、IL-1β和TNF-α在兔子的生殖组织中表达。此外,LPS刺激后,与对照组相比,子宫基质细胞中TLR4染色更强(P < 0.05),输卵管上皮细胞中TNF-α和IL-1β染色更强(P < 0.05)。这些结果表明:(1)TRL4、IL-1β和TNF-α在母兔的子宫和输卵管中表达;(2)LPS上调子宫和输卵管中TLR4和促炎细胞因子的基因和蛋白表达。因此,兔子可能是研究亚临床感染引起的生殖功能障碍所涉及局部机制的有用动物模型。

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