Abstract
Background
Intestinal barrier dysfunction is a serious complication associated with acute pancreatitis (AP). Angiotensin (Ang)-(1–7) plays a protective role in the intestinal barrier, but the underlying mechanism remains clear. This study investigated the impact of Ang-(1–7) on AP-induced intestinal dysfunction and its involvement in the Keap1/Nrf2/HO-1 pathway.
Methods and results
We studied caerulein- and lipopolysaccharide (LPS)-induced AP in mice and an epithelial cell line (IEC-6) from the small intestinal crypt of rats. Ang-(1–7) was administered orally or via the tail vein. IEC-6 cells were divided into five groups: control; LPS; LPS + Ang-(1–7); LPS + Ang-(1–7) + ML385 (an Nrf2 inhibitor); and LPS + ML385. Pancreatic and intestinal histopathology scores were analyzed using the Schmidt and Chiu scores. The expression of intestinal barrier-associated proteins and Keap1/Nrf2/HO-1 pathway constituents was assessed by RT-PCR and western blotting. The peroxide and antioxidant activities in the IEC-6 cells were measured. Compared to those in AP mice, Ang-(1–7) diminished the intestinal levels of proinflammatory factors (interleukin-1β and tumor necrosis factor α) and serum levels of intestine permeability (d-lactate). Ang-(1–7) increased the expression of barrier-associated proteins (aquaporin-1, claudin-1, and occludin) compared to those in the AP and LPS group. Moreover, Ang-(1–7) promoted the Keap/Nrf2/HO-1 pathway, which resulted in significantly reduced malondialdehyde and increased superoxide dismutase levels.. However, ML385 abolished the effects of Ang-(1–7) on barrier-associated proteins and reversed the Keap1/Nrf2/HO-1 pathway.
Conclusions
Ang-(1–7) reduces AP-induced intestinal inflammation and oxidative injuries by activating the Keap1/Nrf2/HO-1 pathway.
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Data availability
The data that support the findings of this study are not openly available and are available from the corresponding author upon reasonable request.
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RRG conducted the study and was a main contributor in the drafting the manuscript. RRG, TYC, and XRW were in charge of AP modeling. RRG and TYC performed the molecular biology experiments and analyzed the data. RXL and CHY designed the experiments, contributed to key materials, and modified the manuscript. All authors contributed to manuscript modification and editing, reviewed, and authorized the submitted manuscript.
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All animal experimental procedures complied with the regulations of the Capital Medical University Animal Experiment Committee ethics review board (Approval No: AEEI-2022-125).
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Gu, R., Cui, T., Guo, Y. et al. Angiotensin-(1–7) ameliorates intestinal barrier dysfunction by activating the Keap1/Nrf2/HO-1 signaling pathway in acute pancreatitis. Mol Biol Rep 50, 5991–6003 (2023). https://doi.org/10.1007/s11033-023-08544-9
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DOI: https://doi.org/10.1007/s11033-023-08544-9