OBJECTIVETo observe the effects of conditioned medium from keloid fibroblasts under hypoxia on angiogenesis, and to investigate the role of hypoxic microenvironment in invasive growth of keloid.

METHODSPrimary keloid fibroblasts and human umbilical endothelial cells (HUVEC) were cultured as conventional method. Keloid fibroblasts were cultured either in a hypoxic incubator (2% O2) for 48 h or in a normoxic incubator (20% O2) as control. Then those cell culture mediums were collected and mixed with endothelial cell medium by the proportion of 1:1 as conditioned medium. The mRNA and secreted protein of pro-angiogenic factors such as vascular endothelial growth factor (VEGF), angiopoietin-1 (Ang-1) and periostin of keloid fibroblasts under hypoxia were detected by real time PCR and ELISA. The proliferation, migration and invasion, tube formation of HUVEC cultured with conditioned medium were evaluated by CCK-8 assay, Transwell assay and matrigel tube formation assay, respectively.

RESULTSHypoxia increased the expression of VEGF, Ang-1 and periostin in both mRNA (increased by 75%, 43% and 118% respectively, P < 0.05) and secreted protein (increased by 30.2%, 14.2% and 19.5% respectively, P < 0.05) levels; the proliferations of HUVEC in hypoxic conditioned medium in 1, 2 and 3 d were 0.67 +/- 0.07, 0.84 +/- 0.09 and 1.08 +/- 0.10 respectively, which were higher compared to those in control group (0.52 +/- 0.08, 0.72 +/- 0.10 and 0.91 + 0.14, P < 0.05); the numbers of migration, invasion and tube formation of HUVEC were (73.2 +/- 8.9), (56.3 +/- 12.5), (9.66 +/- 1.96) cells/HP, which were higher compared to those in control group [(59.0 +/- 8.0), 35.5 +/- 8.5), (6.5 +/- 1.87) cells/HP, P < 0.05].

CONCLUSIONSHypoxia increases the expression of pro-angiogenic factors of keloid fibroblasts, and its conditioned medium under hypoxia could promote angiogenesis. The results suggest hypoxic microenvironment may play a significant role in the invasive growth of keloid by inducing angiogenesis.

Cell Hypoxia ; Cells, Cultured ; Culture Media, Conditioned ; Fibroblasts ; Humans ; Keloid ; pathology ; Neovascularization, Pathologic

AIM: To investigate the genes differential expression in cortex during rat focal cerebral ischemia. METHODS: cDNA microarray chips containing numerous cDNAs were used to investigate the gene expression pattern between samples of focal cerebral ischemia and sham-control operation rats. RESULTS: Two hundred and eleven genes differentially expressed were screened out, among these genes, up-and down-regulated genes were 199 and 12, respectively. CONCLUSIONS: The analysis of gene expression pattern of focal cerebral ischemia based on cDNA microarray can realize high-throughput screening of the genes associated with the focal cerebral ischemia. The differential expression of genes may be related to the pathogenesis of focal cerebral ischemic diseases.

Objective:To study the effect of dexmedetomidine (Dex) combined with sevoflurane anesthesia on postoperative cognitive function and hemodynamics in elderly patients with humeral fractures during the operation.Methods:A total of 120 elderly patients with humeral fractures diagnosed and treated in Chaoyang Central Hospital from January 2018 to June 2020 were selected and divided into the control group (59 cases) and the study group (61 cases) according to the non-randomized clinical concurrent controlled study and patients′ voluntary principle. Sevoflurane inhalation was given to patients to maintain general anesthesia in two groups, while Dex anesthesia was given to the study group. Cognitive function, hemodynamics, stress response and pain were compared between the two groups before and after the operation, and anesthesia related complications were observed and recorded.Results:The mean arterial pressure (MAP) in the study group at 10 min after endotracheal intubation (T 1), operation time (T 2), 30 min after the beginning of the operation (T 3) were lower than those in the control group, the heart rate (HR) in the study group at T 2, T 3 and the immediate time after the operation (T 4) were lower than those in the control group, the differences were statistically significant ( P<0.05). The levels of norepinephrine (NE) and cortisol (Cor) in the study group were lower than those in the control group after the surgery: (0.92 ± 0.19) mmol/L vs. (1.10 ± 0.28) mmol/L, (213.69 ± 20.83) μg/L vs. (258.43 ± 28.27) μg/L, the differences were statistically significant ( P<0.05). The scores of Montreal Cognitive Assessmentin the study group on 3, 7 d after the operation were higher than those in the control group: (23.42 ± 1.37) points vs. (21.39 ± 1.53) points, (25.83 ± 0.95) points vs. (25.14 ± 0.99) points, the differences were statistically significant ( P<0.05). The incidence of anesthesia related complications in the study group was lower than that in the control group: 8.2%(5/61) vs. 22.0%(13/59), χ2 = 4.50, P<0.05. Conclusions:The application of Dex combined with sevoflurane in the anesthesia of elderly patients with humeral fractures is beneficial to maintain hemodynamic stability, reduce stress response and pain degree, and promote the recovery of cognitive function.

Objective:To compare the effects of dexmedetomidine combined with propofol on anesthesia and thromboelastography in patients undergoing radical gastrectomy.Methods:From September 2017 to December 2019, 120 patients undergoing radical gastrectomy in Chaoyang Central Hospital were prospectively selected and divided into control group and observation group according to random number table method, with 60 cases in each group.The two groups used the same drugs before induction and the same way of anesthesia induction. During the maintenance of anesthesia, remifentanil and propofol were injected intravenously in the control group, and dexmedetomidine was injected in the observation group on the basis of the control group. The indexes of thromboelastography, preoperative and postoperative cellular immune function, postoperative analgesic effect [Visual Analogue Scale (VAS)], Ramsay sedation score, and postoperative adverse reactions were compared between the two groups at different times.Results:The reaction time of coagulation factor (R) and fibrinogen (K) in the two groups decreased 3 hours after operation, and those in the observation group were lower than those in the control group (all P<0.05); The maximum thrombus amplitude (MA) of the two groups increased 3 hours after operation, and MA in the observation group was higher than that in the control group (all P<0.05). Compared with that before operation, the VAS scores and Ramsay sedation scores in the control group and the observation group at 24 h and 48 h after operation were significantly lower (all P<0.05), and the VAS scores and Ramsay sedation scores in the observation group at 24 h and 48 h after operation were significantly lower than those in the control group (all P<0.05). Compared with that before operation, the CD4 +, CD8 +, CD4 + /CD8 + in the control group and the observation group were improved at 6 h and 48 h after operation (all P<0.05), and the improvement in the observation group was significantly better than that in the control group at 6 h and 48 h after operation (all P<0.05). The incidence of adverse reactions in the control group was 6.67%(4/60), which was slightly higher than that in the observation group of 5.00%(3/60), but the difference was not statistically significant ( P>0.05). Conclusions:Compared with propofol and remifentanil alone, combined application of dexmedetomidine can help patients undergoing radical gastrectomy for gastric cancer to achieve better analgesic effect, improve the blood coagulation state of patients, and play a better regulatory role on cellular immune function, which is worthy of further promotion in clinic.