Postnatal mesenchymal stem cells have the capacity to differentiate into multiple cell lineages. This study explored the possibility of dental pulp stem cells （DPSCs） for potential application in tendon tissue engin...Postnatal mesenchymal stem cells have the capacity to differentiate into multiple cell lineages. This study explored the possibility of dental pulp stem cells （DPSCs） for potential application in tendon tissue engineering. The expression of tendon- related markers such as scleraxis, tenascin-C, tenomodulin, eye absent homologue 2, collagens I and VI was detected in dental pulp tissue. Interestingly, under mechanical stimulation, these tendon-related markers were significantly enhanced when DPSCs were seeded in aligned polyglycolic acid （PGA） fibre scaffolds. Furthermore, mature tendon-like tissue was formed after transplantation of DPSC-PGA constructs under mechanical loading conditions in a mouse model. This study demonstrates that DPSCs could be a ootential stem cell source for tissue enEineerin~ of tendon-like tissue.展开更多
目的建立西尼罗病毒(West Nile virus,WNV)假病毒的体内感染模型,并对抗体WNV-XH1进行体内中和活性评价。方法利用前期建立的可包装WNV假病毒的稳定细胞株制备假病毒上清,将上清浓缩后感染BHK21细胞检测假病毒滴度。假病毒经腹腔注入C57...目的建立西尼罗病毒(West Nile virus,WNV)假病毒的体内感染模型,并对抗体WNV-XH1进行体内中和活性评价。方法利用前期建立的可包装WNV假病毒的稳定细胞株制备假病毒上清,将上清浓缩后感染BHK21细胞检测假病毒滴度。假病毒经腹腔注入C57BL/J小鼠体内后进行生物发光成像,观测小鼠体内假病毒感染情况。同时感染后取血,ELISA检测小鼠血清中NS1水平。利用建立的小鼠感染模型,评价抗体WNV-XH1的体内功能活性。结果C57BL/J小鼠感染WNV假病毒后,体内可检测到荧光,且感染假病毒的小鼠与未感染的小鼠相比外周血血清中WNV非结构蛋白NS1水平明显升高(1.453±0.09vs0.305±0.018)。攻毒前静脉给予抗体WNV-XH1后,小鼠体内荧光信号减弱,血清中NS1水平下降(0.384±0.015)。结论成功建立WNV假病毒体内感染模型,并证实抗体WNV-XH1在体内对WNV假病毒的感染具有保护作用。展开更多
Objective:Aqueous extracts of Zapoteca portoricensis are used traditionally as antidiarrhea agent and in the treatment of diverse gastrointestinal disorders here in Nigeria specifically,the southern part.Similarly,the...Objective:Aqueous extracts of Zapoteca portoricensis are used traditionally as antidiarrhea agent and in the treatment of diverse gastrointestinal disorders here in Nigeria specifically,the southern part.Similarly,the aqueous extract of the plant is also used traditionally as anticonvulsant,antispasmodic and in the treatment of tonsillitis.Recently too,the anti-inflammatory and antimicrobial activities of the methanol extracts of the root of Zapoteca portoricensis was reported.In this research,we are set to investigate the trypanocidal activity of Zapoteca portoricensis.Methods:The methanol extract of the root of Zapoteca portoricensis was investigated for both in vitro and in vivo trypanocidal activity following established models.In summary,phytochemical analysis was carried out on both the crude powdered root and on the methanol extract following standard procedures. The oral acute toxicity test(LD<sub>50</sub> ) of the crude methanol extract was determined according to the method described by Lorke（1983）.Albino mice（17g-21g） of either sex were used.The methanol extract was suspended in 3%v/v tween 85 and administered orally at doses of 10 mg/kg,100 mg/kg and 1 000 mg/kg to three groups of mice（n = 3 ）.The animals were observed for 24 hours.Based on the result obtained in this initial test,doses of 4 mg/kg,6 mg/kg,and 8 mg/kg were administered to three different mice.The LD<sub>50</sub> was calculated as the geometric mean of the lowest dose killing a mouse and the highest dose showing no death.The invivo /in-vitro antitrypanosomal evaluations were carried out in experimental animals and tissue cell culture respectively. Results:The result of the in vitro studies shows the inhibitive concentration-50（IC-50） against Trypanosoma brucei rhodesiense（T.b.rhodesiense） to be 0.372 mg/kg,while the control drug melarsoprol was 0.006 mg/kg.On Trypanosoma brucei brucei（T.cruzi）,the IC-50 is 6.42 mg/kg against 0.87 of the reference drug Benznidazole.The cytotoxicity on L-6 cells exhibited an IC-50 展开更多
基金supported by the Natural Science Foundation of China (81171470 and 81100761)the key clinical specialty discipline construction programme of Fujian, Chinathe Key Project of Science and Technology Bureau of Jiangsu Province (BL2013002)
文摘Postnatal mesenchymal stem cells have the capacity to differentiate into multiple cell lineages. This study explored the possibility of dental pulp stem cells （DPSCs） for potential application in tendon tissue engineering. The expression of tendon- related markers such as scleraxis, tenascin-C, tenomodulin, eye absent homologue 2, collagens I and VI was detected in dental pulp tissue. Interestingly, under mechanical stimulation, these tendon-related markers were significantly enhanced when DPSCs were seeded in aligned polyglycolic acid （PGA） fibre scaffolds. Furthermore, mature tendon-like tissue was formed after transplantation of DPSC-PGA constructs under mechanical loading conditions in a mouse model. This study demonstrates that DPSCs could be a ootential stem cell source for tissue enEineerin~ of tendon-like tissue.
文摘目的建立西尼罗病毒(West Nile virus,WNV)假病毒的体内感染模型,并对抗体WNV-XH1进行体内中和活性评价。方法利用前期建立的可包装WNV假病毒的稳定细胞株制备假病毒上清,将上清浓缩后感染BHK21细胞检测假病毒滴度。假病毒经腹腔注入C57BL/J小鼠体内后进行生物发光成像,观测小鼠体内假病毒感染情况。同时感染后取血,ELISA检测小鼠血清中NS1水平。利用建立的小鼠感染模型,评价抗体WNV-XH1的体内功能活性。结果C57BL/J小鼠感染WNV假病毒后,体内可检测到荧光,且感染假病毒的小鼠与未感染的小鼠相比外周血血清中WNV非结构蛋白NS1水平明显升高(1.453±0.09vs0.305±0.018)。攻毒前静脉给予抗体WNV-XH1后,小鼠体内荧光信号减弱,血清中NS1水平下降(0.384±0.015)。结论成功建立WNV假病毒体内感染模型,并证实抗体WNV-XH1在体内对WNV假病毒的感染具有保护作用。
文摘Objective:Aqueous extracts of Zapoteca portoricensis are used traditionally as antidiarrhea agent and in the treatment of diverse gastrointestinal disorders here in Nigeria specifically,the southern part.Similarly,the aqueous extract of the plant is also used traditionally as anticonvulsant,antispasmodic and in the treatment of tonsillitis.Recently too,the anti-inflammatory and antimicrobial activities of the methanol extracts of the root of Zapoteca portoricensis was reported.In this research,we are set to investigate the trypanocidal activity of Zapoteca portoricensis.Methods:The methanol extract of the root of Zapoteca portoricensis was investigated for both in vitro and in vivo trypanocidal activity following established models.In summary,phytochemical analysis was carried out on both the crude powdered root and on the methanol extract following standard procedures. The oral acute toxicity test(LD<sub>50</sub> ) of the crude methanol extract was determined according to the method described by Lorke（1983）.Albino mice（17g-21g） of either sex were used.The methanol extract was suspended in 3%v/v tween 85 and administered orally at doses of 10 mg/kg,100 mg/kg and 1 000 mg/kg to three groups of mice（n = 3 ）.The animals were observed for 24 hours.Based on the result obtained in this initial test,doses of 4 mg/kg,6 mg/kg,and 8 mg/kg were administered to three different mice.The LD<sub>50</sub> was calculated as the geometric mean of the lowest dose killing a mouse and the highest dose showing no death.The invivo /in-vitro antitrypanosomal evaluations were carried out in experimental animals and tissue cell culture respectively. Results:The result of the in vitro studies shows the inhibitive concentration-50（IC-50） against Trypanosoma brucei rhodesiense（T.b.rhodesiense） to be 0.372 mg/kg,while the control drug melarsoprol was 0.006 mg/kg.On Trypanosoma brucei brucei（T.cruzi）,the IC-50 is 6.42 mg/kg against 0.87 of the reference drug Benznidazole.The cytotoxicity on L-6 cells exhibited an IC-50
