Liu L, Tan Q, Hu B, Wu H, Wang C, Tang C. Somatostatin inhibits the production of interferon-γ by intestinal epithelial cells during intestinal ischemia-reperfusion in macaques.
Dig Dis Sci 2014;
59:2423-32. [PMID:
24798997 PMCID:
PMC4162988 DOI:
10.1007/s10620-014-3177-4]
[Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Accepted: 04/17/2014] [Indexed: 02/05/2023]
Abstract
BACKGROUND
Our previous study found that somatostatin (SST) inhibited the intestinal inflammatory injury in a macaque model of intestinal ischemia-reperfusion (IIR); however, the underlying mechanism was unclear.
AIMS
The present study was aimed to investigate the effects of SST on IFN-γ and the systemic inflammatory response after IIR.
METHODS
Fifteen macaques were randomly divided into controls, IIR and SST+ IIR groups. ELISA was performed to measure IFN-γ in ileum tissues, ileac epithelial cells (IECs) and ileal lymphocytes, as well as the systemic levels of IL-6, IL-1β, TNF-α and IFN-γ in the peripheral circulation and the portal vein. HE staining was performed to evaluate morphological changes in vital organs. Immunohistochemistry was performed to identify the distribution of IFN-γ, CD4, CD8 and CD57 in the ileum.
RESULTS
After IIR, IFN-γ level was significantly increased in the IECs. IL-6, IL-1β and TNF-α were significantly increased in both the portal vein and the peripheral circulation; in contrast, IFN-γ level was increased in the portal vein alone. Prophylactic SST reversed the change in IFN-γ in the IECs and portal vein. SST led to an alleviation of the pathological changes in systemic vital organs. The distribution of CD4(+), CD57(+) and CD8(+) cells was not positively correlated with the secretion of IFN-γ.
CONCLUSION
IECs are the main source of IFN-γ production after IIR. SST may indirectly lead to mast cell deactivation through the inhibition of IFN-γ production by IECs. Pretreatment with SST may be beneficial for preventing a massive systemic inflammatory response in vital organs after IIR.
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