ObjectiveTo explore the expression of programmed death-1 ligand (PD-L1) on peripheral blood monocytes in septic mice, and analyze the difference between the mild and severe septic mice. MethodsFirstly, thirty C57 mice were randomly divided into a sham group, a mild sepsis group and a severe sepsis group. Sepsis model was induced by cecal ligation and puncture (CLP). The severity of sepsis was distinguished by length of cecum ligated. Survival rate was recorded after CLP and compared between three groups. Then sixty C57 mice were randomly divided into a sham group, a mild sepsis group and a severe sepsis group. Peripheral blood was obtained at 6 h and 24 h to detect PD-L1 expression on monocytes in peripheral blood by flow cytometry. Tumor necrosis factor-α(TNF-α) and interleukin-10 (IL-10) in serum were detected by enzyme-linked immunosorbent assay. ResultsThe survival rate in the mild sepsis group was higher than that in the severe sepsis group. TNF-αand IL-10 levels in the mild and severe sepsis groups were higher than those in the sham group at 6 h and 24 h (P < 0.01). PD-L1 expression on monocytes in the mild and severe sepsis groups was higher than that in the sham group at 6 h and 24 h (P < 0.05). The expression of PD-L1 in the severe sepsis group was higher than that in the mild sepsis group, however, there was no statistical difference between two groups (P > 0.05). ConclusionsPD-L1 expression on monocytes is increased in septic mice. PD-L1 expression tended to increase in severe sepsis compared with the mild sepsis.
ObjectiveTo explore the relationship between severity of gastrointestinal symptoms and psychological stress after the earthquake. MethodsThe sample was teachers from Baoxing county which was most affected by the earthquake. Post-traumatic stress disorder checklist civilian version (PCL-C) scale was used to assess the symptoms of psychological stress at 2-3 weeks, 2-3 months, and 6 months after the earthquake, and gastrointestinal symptoms were evaluated using three questions of patient health questionare (PHQ)-15 at 2-3 months and 6 months after the earthquake. Spearman rank correlation was used to explore the dynamic relationship between the symptoms of psychological stress evaluated at the three waves and gastrointestinal symptoms evaluated at 2-3 months and 6 months after the earthquake. ResultsPrevalence rates of gastrointestinal symptoms in teachers were 6.7% and 4.7% for stomach and abdominal pain, 6.7% and 5.6% for constipation and diarrhea, and 9.1% and 8.1% for nausea and gastrointestinal flatulence or dyspepsia at 2-3 months and 6 months after the earthquake. The relationships between three gastrointestinal symptoms evaluated at 2-3 months and 6 months after the earthquake and psychological stress symptoms evaluated at the three waves were all significant (all P<0.05). ConclusionGastrointestinal symptoms are common among the teachers. The association between psychological stress symptoms and severity of gastrointestinal symptoms at the same point after the earthquake is most strong, and psychological stress symptoms in the early period can predict the severity of subsequent gastrointestinal symptoms, and gastrointestinal symptoms in the early period can predict symptoms of subsequent psychological stress.