目的:探讨体外重建人表皮(reconstructed human epidermis,RhE)试验应用于医疗器械皮肤刺激检测的可行性。方法:制备水胶体敷料极性和非极性试验液以及体积分数为4%和1.5%的乳酸溶液作为试验样品,采用体外RhE试验和体内动物(新西兰白兔...目的:探讨体外重建人表皮(reconstructed human epidermis,RhE)试验应用于医疗器械皮肤刺激检测的可行性。方法:制备水胶体敷料极性和非极性试验液以及体积分数为4%和1.5%的乳酸溶液作为试验样品,采用体外RhE试验和体内动物(新西兰白兔)试验检测试验样品的皮肤刺激性,并比较2种试验的结果。结果:体外RhE试验显示,水胶体敷料极性和非极性试验液及1.5%的乳酸溶液的皮肤刺激性均为阴性,而4%的乳酸溶液的皮肤刺激性为阳性;体内动物试验显示,各试验样品的皮肤刺激性均为阴性。结论:体外RhE试验比体内动物试验更加灵敏、客观,可应用于医疗器械皮肤刺激检测。展开更多
AIM:To establish an animal model with human hepatocyte-repopulated liver for the study of liver cancer metastasis.METHODS:Cell transplantation into mouse livers was conducted using alpha-fetoprotein(AFP)-producing hu-...AIM:To establish an animal model with human hepatocyte-repopulated liver for the study of liver cancer metastasis.METHODS:Cell transplantation into mouse livers was conducted using alpha-fetoprotein(AFP)-producing hu-man gastric cancer cells(h-GCCs) and h-hepatocytes as donor cells in a transgenic mouse line expressing urokinase-type plasminogen activator(uPA) driven by the albumin enhancer/promoter crossed with a severe combined immunodeficient(SCID) mouse line(uPA/SCID mice).Host mice were divided into two groups(A and B).Group A mice were transplanted with h-GCCs alone,and group B mice were transplanted with h-GCCs and h-hepatocytes together.The replacement index(RI),which is the ratio of transplanted h-GCCs and h-hepatocytes that occupy the examined area of a histological section,was estimated by measuring h-AFP and h-albumin concentrations in sera,respectively,as well as by immunohistochemical analyses of h-AFP and human cytokeratin 18 in histological sections.RESULTS:The h-GCCs successfully engrafted,repopulated,and colonized the livers of mice in group A(RI = 22.0% ± 2.6%).These mice had moderately differentiated adenocarcinomatous lesions with disrupted glandular structures,which is a characteristics feature of gastric cancers.The serum h-AFP level reached 211.0 ± 142.2 g/mL(range,7.1-324.2 g/mL).In group B mice,the h-GCCs and h-hepatocytes independently engrafted,repopulated the host liver,and developed colonies(RI = 12.0% ± 6.8% and 66.0% ± 12.3%,respectively).h-GCC colonies also showed typical adenocarcinomatous glandular structures around the h-hepatocyte-colonies.These mice survived for the full 56 day-study and did not exhibit any metastasis of h-GCCs in the extrahepatic regions during the observational period.The mice with an h-hepatocyte-repopulated liver possessed metastasized h-GCCs and therefore could be a useful humanized liver animal model for studying liver cancer metastasis in vivo.CONCLUSION:A novel animal model of human liver cancer metastasis was established using the uPA/SCID mouse line.This model could be useful for in vivo testing of anti-cancer drugs and for studying the mechanisms of human liver cancer metastasis.展开更多
文摘目的:探讨体外重建人表皮(reconstructed human epidermis,RhE)试验应用于医疗器械皮肤刺激检测的可行性。方法:制备水胶体敷料极性和非极性试验液以及体积分数为4%和1.5%的乳酸溶液作为试验样品,采用体外RhE试验和体内动物(新西兰白兔)试验检测试验样品的皮肤刺激性,并比较2种试验的结果。结果:体外RhE试验显示,水胶体敷料极性和非极性试验液及1.5%的乳酸溶液的皮肤刺激性均为阴性,而4%的乳酸溶液的皮肤刺激性为阳性;体内动物试验显示,各试验样品的皮肤刺激性均为阴性。结论:体外RhE试验比体内动物试验更加灵敏、客观,可应用于医疗器械皮肤刺激检测。
基金Supported by CLUSTER-Yoshizato Project and the National Hospital Organization Nagasaki Medical Center
文摘AIM:To establish an animal model with human hepatocyte-repopulated liver for the study of liver cancer metastasis.METHODS:Cell transplantation into mouse livers was conducted using alpha-fetoprotein(AFP)-producing hu-man gastric cancer cells(h-GCCs) and h-hepatocytes as donor cells in a transgenic mouse line expressing urokinase-type plasminogen activator(uPA) driven by the albumin enhancer/promoter crossed with a severe combined immunodeficient(SCID) mouse line(uPA/SCID mice).Host mice were divided into two groups(A and B).Group A mice were transplanted with h-GCCs alone,and group B mice were transplanted with h-GCCs and h-hepatocytes together.The replacement index(RI),which is the ratio of transplanted h-GCCs and h-hepatocytes that occupy the examined area of a histological section,was estimated by measuring h-AFP and h-albumin concentrations in sera,respectively,as well as by immunohistochemical analyses of h-AFP and human cytokeratin 18 in histological sections.RESULTS:The h-GCCs successfully engrafted,repopulated,and colonized the livers of mice in group A(RI = 22.0% ± 2.6%).These mice had moderately differentiated adenocarcinomatous lesions with disrupted glandular structures,which is a characteristics feature of gastric cancers.The serum h-AFP level reached 211.0 ± 142.2 g/mL(range,7.1-324.2 g/mL).In group B mice,the h-GCCs and h-hepatocytes independently engrafted,repopulated the host liver,and developed colonies(RI = 12.0% ± 6.8% and 66.0% ± 12.3%,respectively).h-GCC colonies also showed typical adenocarcinomatous glandular structures around the h-hepatocyte-colonies.These mice survived for the full 56 day-study and did not exhibit any metastasis of h-GCCs in the extrahepatic regions during the observational period.The mice with an h-hepatocyte-repopulated liver possessed metastasized h-GCCs and therefore could be a useful humanized liver animal model for studying liver cancer metastasis in vivo.CONCLUSION:A novel animal model of human liver cancer metastasis was established using the uPA/SCID mouse line.This model could be useful for in vivo testing of anti-cancer drugs and for studying the mechanisms of human liver cancer metastasis.
