AIM： To enrich hepatic progenitors using epithelial cell adhesion molecule （EpCAM） as a marker from human fetal liver and investigate the expression of human leukocyte antigen （HLA） and their markers associated w...AIM： To enrich hepatic progenitors using epithelial cell adhesion molecule （EpCAM） as a marker from human fetal liver and investigate the expression of human leukocyte antigen （HLA） and their markers associated with hepatic progenitor cells. METHODS： EpCAM ＋ve cells were isolated using magnetic cell sorting （MACS） from human fetuses （n = 10） at 15-25 wk gestation. Expression of markers for hepatic progenitors such as albumin, alpha-fetoprotein （AFP）, CD29 （integrin ~1）, CD49f （integrin c^6） and CD90 （Thy 1） was studied by using flow cytometry, immunocytochemistry and RT-PCR; HLA class Ⅰ （A, B, C） and class Ⅱ （DR） expression was studied by flow cytometry only. RESULTS： FACS analysis indicated that EpCAM ＋ve cells were positive for CD29, CD49f, CD90, CD34, HLA class I, albumin and AFP but negative for HLA class Ⅱ （DR） and CD45. RT PCR showed that EpCAM ＋ve cells expressed liver epithelial markers （CK18）, biliary specific marker （CK19） and hepatic markers （albumin, AFP）. On immunocytochemical staining, EpCAM ＋ve cells were shown positive signals for CK18 and albumin. CONCLUSION： Our study suggests that these EpCAM ＋ve cells can be used as hepatic progenitors for cell transplantation with a minimum risk of alloreactivity and these cells may serve as a potential source for enrichment of hepatic progenitor.展开更多
AIM: To provide further insight into the characterization of mucosa-associated Escherichia coli (E. coli) isolated from the colonic mucosa of cancer patients.
The combination of tumor ablation and immunotherapy is a promising strategy against tumor relapse and metastasis.Photothermal therapy(PTT)triggers the release of tumor-specific antigens and damage associated molecular...The combination of tumor ablation and immunotherapy is a promising strategy against tumor relapse and metastasis.Photothermal therapy(PTT)triggers the release of tumor-specific antigens and damage associated molecular patterns(DAMPs)in-situ.However,the immunosuppressive tumor microenvironment restrains the activity of the effector immune cells.Therefore,systematic immunomodulation is critical to stimulate the tumor microenvironment and augment the anti-tumor therapeutic effect.To this end,polyethylene glycol(PEG)-stabilized platinum(Pt)nanoparticles(Pt NPs)conjugated with a PD-L1 inhibitor(BMS-1)through a thermo-sensitive linkage were constructed.Upon near-infrared(NIR)exposure,BMS-1 was released and maleimide(Mal)was exposed on the surface of Pt NPs,which captured the antigens released from the ablated tumor cells,resulting in the enhanced antigen internalization and presentation.In addition,the Pt NPs acted as immune adjuvants by stimulating dendritic cells(DCs)maturation.Furthermore,BMS-1 relieved T cell exhaustion and induced the infiltration of effector T cells into the tumor tissues.Thus,Pt NPs can ablate tumors through PTT,and augment the anti-tumor immune response through enhanced antigen presentation and T cells infiltration,thereby preventing tumor relapse and metastasis.展开更多
The data from in vitro and animal experiment study has showed that costimulaory molecule B7 1 plays an important role in antitumor immunity In the present study, B7 1 expression was ob...The data from in vitro and animal experiment study has showed that costimulaory molecule B7 1 plays an important role in antitumor immunity In the present study, B7 1 expression was observed in 130 samples from a veriety of human malignancies by using immunocytochemistry, in situ hybridization and RT PCR combined with dot hybridization and B7 1 specific Mab and probe The results demonstrated B7 1 expression on tumor cells in 76 cases at both protein and mRNA level Forty two specimens were stained with B7 1 HLA ABC and HLA DR Mab and 26 showed that the three antibodies used all were positive Together with the achievement in tumor antigen study, the present findings imply that in most tumors (if not all) the tumor cells have all the requisite element to elicit anti tumor rejection response, the heterogeneous mechanism for tumor escape from immunosurvillance should be emphasized展开更多
基金Council of Scientific and Industrial Research Network Grant CMM002ICMR Grant (GAP 0215)
文摘AIM： To enrich hepatic progenitors using epithelial cell adhesion molecule （EpCAM） as a marker from human fetal liver and investigate the expression of human leukocyte antigen （HLA） and their markers associated with hepatic progenitor cells. METHODS： EpCAM ＋ve cells were isolated using magnetic cell sorting （MACS） from human fetuses （n = 10） at 15-25 wk gestation. Expression of markers for hepatic progenitors such as albumin, alpha-fetoprotein （AFP）, CD29 （integrin ~1）, CD49f （integrin c^6） and CD90 （Thy 1） was studied by using flow cytometry, immunocytochemistry and RT-PCR; HLA class Ⅰ （A, B, C） and class Ⅱ （DR） expression was studied by flow cytometry only. RESULTS： FACS analysis indicated that EpCAM ＋ve cells were positive for CD29, CD49f, CD90, CD34, HLA class I, albumin and AFP but negative for HLA class Ⅱ （DR） and CD45. RT PCR showed that EpCAM ＋ve cells expressed liver epithelial markers （CK18）, biliary specific marker （CK19） and hepatic markers （albumin, AFP）. On immunocytochemical staining, EpCAM ＋ve cells were shown positive signals for CK18 and albumin. CONCLUSION： Our study suggests that these EpCAM ＋ve cells can be used as hepatic progenitors for cell transplantation with a minimum risk of alloreactivity and these cells may serve as a potential source for enrichment of hepatic progenitor.
基金Supported by Ministère de l’Enseignement supérieur et de la Recherche,Inserm and Universitéd’Auvergne(UMR1071),INRA(USC-2018)Grants from the Association F.Aupetit(AFA)and Ligue contre le cancer
文摘AIM: To provide further insight into the characterization of mucosa-associated Escherichia coli (E. coli) isolated from the colonic mucosa of cancer patients.
基金The authors acknowledge the financial support from National Natural Science Foundation of China(Grant Nos.21975246 and 51903233)The project was supported by Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences.
文摘The combination of tumor ablation and immunotherapy is a promising strategy against tumor relapse and metastasis.Photothermal therapy(PTT)triggers the release of tumor-specific antigens and damage associated molecular patterns(DAMPs)in-situ.However,the immunosuppressive tumor microenvironment restrains the activity of the effector immune cells.Therefore,systematic immunomodulation is critical to stimulate the tumor microenvironment and augment the anti-tumor therapeutic effect.To this end,polyethylene glycol(PEG)-stabilized platinum(Pt)nanoparticles(Pt NPs)conjugated with a PD-L1 inhibitor(BMS-1)through a thermo-sensitive linkage were constructed.Upon near-infrared(NIR)exposure,BMS-1 was released and maleimide(Mal)was exposed on the surface of Pt NPs,which captured the antigens released from the ablated tumor cells,resulting in the enhanced antigen internalization and presentation.In addition,the Pt NPs acted as immune adjuvants by stimulating dendritic cells(DCs)maturation.Furthermore,BMS-1 relieved T cell exhaustion and induced the infiltration of effector T cells into the tumor tissues.Thus,Pt NPs can ablate tumors through PTT,and augment the anti-tumor immune response through enhanced antigen presentation and T cells infiltration,thereby preventing tumor relapse and metastasis.
基金supported by the grants from The Special Science and Research Foundation of Wuhan University of Science and Technology(zx0802)the Youth and Middle-Age Scientist Science and Research Foundation of the Affiliated Tianyou Hospital,Wuhan University of Science and Technology(xq2008001)+1 种基金the Foundation of Hubei Provincial Department of Education(530026)the Natural Science Foundation of Jiangxi Province(0640190)
文摘The data from in vitro and animal experiment study has showed that costimulaory molecule B7 1 plays an important role in antitumor immunity In the present study, B7 1 expression was observed in 130 samples from a veriety of human malignancies by using immunocytochemistry, in situ hybridization and RT PCR combined with dot hybridization and B7 1 specific Mab and probe The results demonstrated B7 1 expression on tumor cells in 76 cases at both protein and mRNA level Forty two specimens were stained with B7 1 HLA ABC and HLA DR Mab and 26 showed that the three antibodies used all were positive Together with the achievement in tumor antigen study, the present findings imply that in most tumors (if not all) the tumor cells have all the requisite element to elicit anti tumor rejection response, the heterogeneous mechanism for tumor escape from immunosurvillance should be emphasized
