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Objective:To explore the uptake characteristics and temporal changes of 68Ga-fibroblast activation protein inhibitors (FAPIs) and 18F-FDG in the anastomotic site of reconstructed digestive tracts after radical surgery for gastrointestinal adenocarcinoma. Methods:A cohort of 43 patients (28 males, 15 females; age range 28-79 years) who underwent radical surgery for gastrointestinal adenocarcinoma and underwent 18F-FDG PET/CT follow-up between November 2020 and June 2022 in the First Affiliated Hospital of the Air Force Medical University was prospectively included. One week after the 18F-FDG PET/CT examination, 68Ga-FAPI-04 PET/CT imaging was performed. ROIs were drawn on the PET images at the highest uptake level of anastomotic sites of reconstructed digestive tract and abdominal wall incisions, and SUV max and target-to-background ratio (TBR) were determined. χ2 test, one-way analysis of variance, Kruskal-Wallis rank sum test (Bonferroni correction) and Wilcoxon signed-rank test were supplied. Results:There were 86 surgical wounds (13 gastric-intestinal anastomotic sites, 14 esophagus-intestinal anastomotic sites, 16 intestinal-intestinal anastomotic sites, and 43 abdominal wall incisions) included. In 68Ga-FAPI-04 PET imaging, SUV max of gastric-intestinal anastomotic sites was higher than that of abdominal wall incisions, with a statistically significant difference (adjusted P=0.014). The TBR did not show statistically significant differences among different types of surgical wounds ( H=3.88, P=0.275). In 18F-FDG PET imaging, SUV max of gastric-intestinal, esophagus-intestinal, and intestinal-intestinal anastomotic sites were all higher than that of abdominal wall incisions, with statistically significant differences (adjusted all P<0.001). There were no statistically significant differences in TBR among different types of surgical wounds ( H=3.02, P=0.388). In 68Ga-FAPI-04 PET imaging, the TBR of all types of anastomotic sites exhibited a decreasing trend with increasing postoperative time. Except for intestinal-intestinal anastomotic sites, the differences in TBR between < 0.5-year and ≥ 1.5-year groups were statistically significant for other types of surgical wounds (adjusted P<0.05). In 18F-FDG PET imaging, the TBR of abdominal wall incisions showed a decreasing trend with increasing postoperative time. However, the TBR of other types of surgical wounds did not show a decreasing trend, and the differences in TBR among different time groups were not statistically significant ( H values: 0.53-2.75, P values: 0.252-0.768). In comparing the two PET imaging agents, for all surgical wounds within the <0.5-year and 0.5-1.5-year groups, the 68Ga-FAPI-04 TBR was consistently higher than the 18F-FDG TBR ( z values: -3.17 and -2.55, P values: 0.002 and 0.011). However, in the ≥1.5-year group, the TBR values tended to be consistent, and the differences were not statistically significant ( z=-0.70, P=0.485). Conclusions:The 18F-FDG uptake in the anastomotic sites of reconstructed digestive tracts reaches a low level under half a year after surgery and does not significantly change over time, while the 68Ga-FAPIs uptake remains relatively high within the first 1.5 years after surgery but decreases over time. These patterns suggest that clinical attention should be paid to the differential diagnosis of anastomotic inflammation or fibrosis, which resulting in agent uptake and local tumor recurrence.
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This article was aimed to study the effects of plumbagin to human hepatic stellate cells.Observations were made on the influence of proliferation inhibition rate,apoptosis,secretion of extracellular matrix function and matrix metalloproteinase (MMP) by plumbagin.HSC-LX2 and drug were co-incubated for 48 hours.Then,MTT assay was used in the detection of inhibition of cell proliferation.The flow cytometry was used in the detection of apoptosis.Immunohistochemical method was used to observe typeⅠ and Ⅲ collagen,MMP-1 and MMP-13 expression location and area.The results showed that the low,medium and high concentrations of plumbagin inhibited cell proliferation rate of HSC-LX2,induced apoptosis of cells,reduced the secretion of typeⅠ and Ⅲ collagen,and increased the secretion ability of MMP-1 and MMP-13.Effects mentioned above were dose-dependent with statistical difference (P < 0.05).Effects in the medium and high concentrations groups were stronger than colchicine group.It was concluded that plumbagin had the ability to inhibit cell proliferation rate of HSC-LX2,induce apoptosis,reduce the secretion of extracellular matrix,and increase the secretion ability of fibrin degradation enzyme.Therefore,it had intervention effect on the process of liver fibrosis.All effects mentioned above were dose-dependent.And effects in the medium and high concentrations groups were stronger than colchicine group.
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Objective To explore the effect of mesenchymal stem cells(MSCs) on nervous function in rats with focal cerebral ischemia.Methods The MSCs were cultivated,purified,and proliferated in vitro by density gradient and adherence to plastic dishes method.The models of Wistar rats were prepared after middle cerebral artery occlusion(MCAO) of right lasted 90 min and reperfusion 1 h.Wistar rats were randomly divided into normal control group(A,n=10),sham operation group(B,n=10),no-handle group after cerebral ischemia/reperfusion (C,n=10),free-serm DMEM transplantation group after cerebral ischemia/reperfusion(D,n=10),MSCs transplantation group after cerebral ischemia/reperfusion(E,n=10).After identified by flow cytometry,5 ?L 5-bromo-2-deoxyuridine(BrdU) labeled MSCs(4?105? ?L-1) and 5 ?L serum-free DMEM were respectively injected intracerebraly into ischemic boundary zone of right in D and E groups.Immunohistochemical method was used to detect the expression and survival of BrdU-labeled MSCs in vivo.Nervous function behavioral tests were performed on 1st,3th,7th and 28th day after transplantation by forelimb use asymmetry test and postural reflex test.Results MSCs were successfully purified and proliferated in vitro.The MSCs expressed CD29,CD44,but didn't expressed CD34,CD45,CD31 identified by flow cytometry.transplanted MSCs survived and were localized to the ischemic boundary zone.Behavioral tests of every group were improved with time prolonged.However,MSCs transplantation group was significantly better than any other groups(P