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BACKGROUND: Platelet-rich plasma has been widely used in orthopedics, plastic surgery, maxillofacial surgery, sports medicine, and intractable wounds due to its advantages of simple preparation, autologous source, low cost, and good safety. OBJECTIVE: To analyze the existing research structure of platelet-rich plasma in recent 5 years worldwide by using CiteSpace software, and to analyze the research hotspots and the evolution trend of platelet-rich plasma by using the visual network map generated by the software, in order to explore the academic frontiers and provide the choice of research direction. METHODS: The Web of Science Core Collection and CNKI database were searched for platelet-rich plasma related literature records published between 2015 and 2020. We visually analyzed the enrolled studies in terms of countries/regions, institutions, authors, journals, and keywords based on the knowledge network maps generated by the CiteSpace software. RESULTS AND CONCLUSION: The average annual number of documents issued in China from 2015 to 2019 was 184.2; the high-yield institutions issued in cooperation were represented by the Department of Orthopaedics of the Sixth People’s Hospital Affiliated to Shanghai Jiao Tong University; the high-yield authors issued in cooperation were represented by Shan Guiqiu; the keywords of hotspots were growth factors, bone marrow stem cells, osteoarthritis, etc. Internationally, the average annual number of documents issued in 2015-2019 was about 928.2; the countries with high yield of cooperative documents issued were the United States, China and Italy; the institutions with high yield of cooperative documents issued were New York Hospital for Special Surgery, University of Pittsburgh and Rush University; the author with high yield of cooperative documents issued was Anitua E; the keywords for hotspots were growth factors, stem cells and repair; and the influential journal was American Journal of Sports Medicine. According to the results of CiteSpace literature analysis, platelet-rich plasma has developed rapidly in the fields of orthopedics, sports medicine and tissue engineering, both at home and abroad.
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Objective To obtain purified myosin-Vc (Myo5c) protein and prepare its polyclonal antibodies of mouse and rabbit. Methods The fragment encoding Myo5c specific protein (297 amino acids) was amplified with RT-PCR from human gastric mucosa. The product and the prokaryotic expression plasmid pQE-31 containing 6?His were used to construct pQE-31/Myo5c. The recombinant was transformed into E. coli JM109 and induced to express with IPTG. The objective product was purified. BALB/c mice and rabbits were immunized with the purified Myo5c protein and the antiserum was obtained. Titer and specificity of the polyclonal antibodies were determined by ELISA and Western blotting. Results pQE-31/Myo5c was successfully constructed. The fusion protein of Myo5c with molecular weight 42 000 was obtained and purified. The recombined protein showed immunogenicity. Mouse or rabbit antiserum with high level of specific antibodies for Myo5c was obtained. Indirect immunostaining and Western blotting analysis demonstrated that the antibodies could recognize native Myo5c protein. Conclusion Our results suggest that the prepared antibodies might be useful in studying the function of Myo5c in intracellular trafficking of endocytic vesicle, such as viruses.
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Objective To investigate the changes of intracellular GSH content in HepG2 cells infected with dengue virus(DV)or stably expressing E or NS3 protein.Methods HepG2 cells were cocultured with DV or inactivitated DV,l h later the viral supernatant was removed.The infected HepG2 cells were collected 10,20,30,40,60 min,and 2,6,12,24,48 h after the beginning coculture and intracellular GSH content was detected by spectrophotometry.Intracellular GSH content was also detected in HepG2 cells stably expressing E protein/NS3(pReceiver-E/HepG2,pReceiver-NS3/HepG2)and those containing empty plasmid(pReceiver/HepG2).Results GSH content showed a decreasing tendency after DV-2 infection.The lowest values were seen 30 min and 2,24 h after infection,which were of significant difference in comparison with those in inactivated DV infected HepG2 cells as well as at other time points.GSH levels in pReceiver-E/HepG2,pReceiver-NS3/HepG2 were significantly lower than those in pReceiver/HepG2.Conclusion DV-2 infection might lead to the GSH depletion in HepG2 cells,and GSH lost from HepG2 cells might undergo a three-step process:virus adsorption/penetration,protein synthesis and budding.E or NS3 protein stably expressed in HepG2 cells can also decrease the GSH levels.