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OBJECTIVE To investigate the effect and mechanism of Panax notoginseng saponins （PNS） on wound healing after anal fistula surgery in rats by regulating the hypoxia-inducible factor-1α （HIF-1α）/vascular endothelial growth factor （VEGF）/ vascular endothelial growth factor receptor-2 （VEGFR2） signaling pathway. METHODS SD rats were selected to establish a postoperative rat model of anal fistula by infecting wound with Escherichia coli. The model rats were randomly grouped into model group， PNS low-dose and high-dose groups （15， 30 mg/cm2）， high-dose of PNS+2-methoxyestradiol （2ME2） group （PNS 30 mg/cm2+HIF-1α inhibitor 2ME2 4 mg/kg）， with 10 rats in each group. Another 10 normal rats were selected for back hair removal treatment as the control group. Each drug group was injected with the corresponding drug solution intramuscularly or （and） intraperitoneally， once a day， for 3 weeks. After the last administration， the wound healing rate （excluding the control group）， microvascular density （MVD）， the expression of collagen Ⅰ and fibronectin （FN） in the wound tissue were detected in each group； the levels of angiogenic factors [VEGF， E-mail：842710813@qq.com angiopoietin-Ⅰ （Ang-Ⅰ）， Ang-Ⅱ] in serum， the levels of inflammatory factors [interleukin-6 （IL-6） and IL-2] in serum binggui7183@163.com and wound tissue as well as the expressions of the related proteins of HIF-1α/VEGF/VEGFR2 signaling pathway in the wound tissue of rats were also detected in each group. RESULTS The MVD， the expression of collagen Ⅰ and FN in the wound tissue， and the levels of IL-6 and IL-2 in serum and wound tissue of rats increased significantly in the model group， compared to the control group （P＜0.05）， while the serum levels of VEGF， Ang- Ⅰ and Ang-Ⅱ decreased significantly （P＜0.05）. The wound healing rate， the MVD in wound tissue， the serum levels of VEGF， Ang-Ⅰ and Ang-Ⅱ， the expressions of collagen Ⅰ and FN in the wound tissue， and protein expressions of HIF-1α， VEGF and VEGFR2 in the PNS low-dose and high-dose groups increased significantly， compared to the model group （P＜0.05）， while the levels of IL-6 and IL-2 in serum and wound tissue decreased significantly （P＜0.05）； the high-dose PNS had a stronger effect （P＜ 0.05）. 2ME2 could weaken the effect of PNS on above indicators of rats after anal fistula surgery （P＜0.05）. CONCLUSIONS PNS can promote the production of angiogenic factors and inhibit the production of pro-inflammatory factors， thereby promoting wound healing in rats after anal fistula surgery. The above effects are related to the activation of HIF-1α/VEGF/VEGFR2 signaling pathway.
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Objective:To comb the development of transitional care, analyze and compare the research hotspots and frontiers at home and abroad.Methods:CNKI Database and Web of Science Core Collection were taken as data sources to retrieve the relevant literature published from 2000 to 2019; CiteSpace software was used to construct scientific knowledge maps for visualization analysis.Results:A total of 285 Chinese and 1 179 English documents were retrieved, and the annual publications showed an upward trend from 2012. The high-yield institutions and authors were relatively scattered. Chinese papers focused on subjective indicators such as quality of life, and most of which were literature review. While English papers tended to focus on objective indicators, such as readmission and mortality rate, and the research type was mainly intervention study. The Chinese keywords "WeChat" and English "palliative care" were with the strongest citation bursts in recent years.Conclusions:The domestic development of transitional care is relatively lagging; cooperation between institutions and authors should be strengthened. Future researches on palliative care or combined with WeChat platform may become hotspots in this field.
ABSTRACT
Objective@#To comb the development of transitional care, analyze and compare the research hotspots and frontiers at home and abroad.@*Methods@#CNKI Database and Web of Science Core Collection were taken as data sources to retrieve the relevant literature published from 2000 to 2019; CiteSpace software was used to construct scientific knowledge maps for visualization analysis.@*Results@#A total of 285 Chinese and 1 179 English documents were retrieved, and the annual publications showed an upward trend from 2012. The high-yield institutions and authors were relatively scattered. Chinese papers focused on subjective indicators such as quality of life, and most of which were literature review. While English papers tended to focus on objective indicators, such as readmission and mortality rate, and the research type was mainly intervention study. The Chinese keywords "WeChat" and English "palliative care" were with the strongest citation bursts in recent years.@*Conclusions@#The domestic development of transitional care is relatively lagging; cooperation between institutions and authors should be strengthened. Future researches on palliative care or combined with WeChat platform may become hotspots in this field.