AIM: To characterize the alpha-fetoprotein (AFP) positive and negative hepatocellular carcinoma (HCC) samples.METHODS: Thirty-seven paraffin-embedded human HCC samples were analyzed by immunohistochemistry for the fol...AIM: To characterize the alpha-fetoprotein (AFP) positive and negative hepatocellular carcinoma (HCC) samples.METHODS: Thirty-seven paraffin-embedded human HCC samples were analyzed by immunohistochemistry for the following antigens: AFP, β-catenin, p53, CD44, MSH-2,MLH-1, and HNF-4. The tumors were divided into two groups based on the AFP expression. The immunophenotypic data and important clinical parameters were studied between the two groups.RESULTS: Twenty-one of the thirty-seven examined HCCs were AFP positive. Seven with nuclear p53 staining were AFP positive, while seven tumors with nuclear β-catenin staining were AFP negative. CD44 staining and high histological tumor grade were more frequent among the AFP-positive HCCs. The other immunophenotypical and dinical parameters did not show statistically significant difference in their distribution between the AFP positive and negative samples.CONCLUSION: AFP expression in HCC correlates with unfavorable prognostic factors, while nuclear β-catenin positivity is more common among the AFP-negative liver tumors. This observation supports the microarray data onin vivo human tumors.展开更多
Mg-Y-Zn-Al alloys processed by rapidly solidified ribbon consolidation(RSRC)technique exhibit an exceptional mechanical performance indicating promising application potential.This material has a bimodal microstructure...Mg-Y-Zn-Al alloys processed by rapidly solidified ribbon consolidation(RSRC)technique exhibit an exceptional mechanical performance indicating promising application potential.This material has a bimodal microstructure consisting of fine recrystallized and coarse non-recrystallized grains with solute-rich stacking faults forming cluster arranged layers(CALs)and nanoplates(CANaPs),or complete long period stacking ordered(LPSO)phase.In order to reveal the deformation mechanisms,in-situ synchrotron X-ray diffraction line profile analysis was employed for a detailed study of the dislocation arrangement created during tension in Mg-0.9%Zn-2.05%Y-0.15%Al(at%)alloy.For uncovering the effect of the initial microstructure on the mechanical performance,additional samples were obtained by annealing of the as-consolidated specimen at 300 and 400℃ for 2 h.The heat treatment at 300℃ had no significant effect on the initial microstructure,its evolution during tension and,thus,the overall deformation behavior under tensile loading.On the other hand,annealing at 400℃ resulted in a significant increase of the recrystallized grains fraction and a decrease of the dislocation density,leading to only minor degradation of the mechanical strength.The maximum dislocation density at the failure of the samples corresponding to the plastic strain of 10-25% was estimated to be about 16-20×10^(14)m^(-2).The diffraction profile analysis indicated that most dislocations formed during tension were of non-basal and pyramidal types,what was also in agreement with the Schmid factor values revealed independently from orientation maps.It was also shown that the dislocation-induced Taylor hardening was much lower below the plastic strain of 3% than above this value,which was explained by a model of the interaction between prismatic dislocations and CANaPs/LPSO plates.展开更多
Background:It remains unclear if the vascular and connective tissue structures of primary and metastatic tumors are intrinsically determined or whether these characteristics are defined by the host tissue.Therefore we...Background:It remains unclear if the vascular and connective tissue structures of primary and metastatic tumors are intrinsically determined or whether these characteristics are defined by the host tissue.Therefore we examined the microanatomical steps of vasculature and connective tissue development of C38 colon carcinoma in different tissues.Methods:Tumors produced in mice at five different locations(the cecal wall,skin,liver,lung,and brain)were ana-lyzed using fluorescent immunohistochemistry,electron microscopy and quantitative real-time polymerase chain reaction.Results:We found that in the cecal wall,skin,liver,and lung,resident fibroblasts differentiate into collagenous matrix-producing myofibroblasts at the tumor periphery.These activated fibroblasts together with the produced matrix were incorporated by the tumor.The connective tissue development culminated in the appearance of intratumoral tissue columns(centrally located single microvessels embedded in connective tissue and smooth muscle actin-expressing myofibroblasts surrounded by basement membrane).Conversely,in the brain(which lacks fibroblasts),C38 metasta-ses only induced the development of vascularized desmoplastic tissue columns when the growing tumor reached the fibroblast-containing meninges.Conclusions:Our data suggest that the desmoplastic host tissue response is induced by tumor-derived fibrogenic molecules acting on host tissue fibroblasts.We concluded that not only the host tissue characteristics but also the tumor-derived fibrogenic signals determine the vascular and connective tissue structure of tumors.展开更多
基金Supported by the National Science Foundation of Hungary, No.OTKA 42674
文摘AIM: To characterize the alpha-fetoprotein (AFP) positive and negative hepatocellular carcinoma (HCC) samples.METHODS: Thirty-seven paraffin-embedded human HCC samples were analyzed by immunohistochemistry for the following antigens: AFP, β-catenin, p53, CD44, MSH-2,MLH-1, and HNF-4. The tumors were divided into two groups based on the AFP expression. The immunophenotypic data and important clinical parameters were studied between the two groups.RESULTS: Twenty-one of the thirty-seven examined HCCs were AFP positive. Seven with nuclear p53 staining were AFP positive, while seven tumors with nuclear β-catenin staining were AFP negative. CD44 staining and high histological tumor grade were more frequent among the AFP-positive HCCs. The other immunophenotypical and dinical parameters did not show statistically significant difference in their distribution between the AFP positive and negative samples.CONCLUSION: AFP expression in HCC correlates with unfavorable prognostic factors, while nuclear β-catenin positivity is more common among the AFP-negative liver tumors. This observation supports the microarray data onin vivo human tumors.
基金financially supported by the International Visegrad Fund(project V4-Japan Joint Research Program,Ref.JP3936)the National Research,Development and Innovation Office(Contract No.:2019-2.1.7-ERANET-2021-00030)+1 种基金Support by the Ministry of Education,Youth and Sports of Czech Republic in the framework of Visegrad Group(V4)-Japan Joint Research Program-Advanced Materials under grant No.8F21011supported by JST SICORP Grant Number JPMJSC2109,Japan。
文摘Mg-Y-Zn-Al alloys processed by rapidly solidified ribbon consolidation(RSRC)technique exhibit an exceptional mechanical performance indicating promising application potential.This material has a bimodal microstructure consisting of fine recrystallized and coarse non-recrystallized grains with solute-rich stacking faults forming cluster arranged layers(CALs)and nanoplates(CANaPs),or complete long period stacking ordered(LPSO)phase.In order to reveal the deformation mechanisms,in-situ synchrotron X-ray diffraction line profile analysis was employed for a detailed study of the dislocation arrangement created during tension in Mg-0.9%Zn-2.05%Y-0.15%Al(at%)alloy.For uncovering the effect of the initial microstructure on the mechanical performance,additional samples were obtained by annealing of the as-consolidated specimen at 300 and 400℃ for 2 h.The heat treatment at 300℃ had no significant effect on the initial microstructure,its evolution during tension and,thus,the overall deformation behavior under tensile loading.On the other hand,annealing at 400℃ resulted in a significant increase of the recrystallized grains fraction and a decrease of the dislocation density,leading to only minor degradation of the mechanical strength.The maximum dislocation density at the failure of the samples corresponding to the plastic strain of 10-25% was estimated to be about 16-20×10^(14)m^(-2).The diffraction profile analysis indicated that most dislocations formed during tension were of non-basal and pyramidal types,what was also in agreement with the Schmid factor values revealed independently from orientation maps.It was also shown that the dislocation-induced Taylor hardening was much lower below the plastic strain of 3% than above this value,which was explained by a model of the interaction between prismatic dislocations and CANaPs/LPSO plates.
基金KD is the recipient of the Bolyai fellowship of the Hungarian Academy of Sciences and received support from the National Excellence Program(TÁMOP 4.2.4.A/1-11-1-2012-0001)BD acknowledges support from the Hungarian NRDI Office(K109626,K108465,KNN121510 and SNN114490)+2 种基金SP and VL acknowledge support from the Hungarian NRDI Office(ANN125583)JT acknowledges support from the National Research,Development and Innovation Office(NKFIH116295)EB is the recipient of postdoctoral fellowship from the Hungarian Academy of Sciences.
文摘Background:It remains unclear if the vascular and connective tissue structures of primary and metastatic tumors are intrinsically determined or whether these characteristics are defined by the host tissue.Therefore we examined the microanatomical steps of vasculature and connective tissue development of C38 colon carcinoma in different tissues.Methods:Tumors produced in mice at five different locations(the cecal wall,skin,liver,lung,and brain)were ana-lyzed using fluorescent immunohistochemistry,electron microscopy and quantitative real-time polymerase chain reaction.Results:We found that in the cecal wall,skin,liver,and lung,resident fibroblasts differentiate into collagenous matrix-producing myofibroblasts at the tumor periphery.These activated fibroblasts together with the produced matrix were incorporated by the tumor.The connective tissue development culminated in the appearance of intratumoral tissue columns(centrally located single microvessels embedded in connective tissue and smooth muscle actin-expressing myofibroblasts surrounded by basement membrane).Conversely,in the brain(which lacks fibroblasts),C38 metasta-ses only induced the development of vascularized desmoplastic tissue columns when the growing tumor reached the fibroblast-containing meninges.Conclusions:Our data suggest that the desmoplastic host tissue response is induced by tumor-derived fibrogenic molecules acting on host tissue fibroblasts.We concluded that not only the host tissue characteristics but also the tumor-derived fibrogenic signals determine the vascular and connective tissue structure of tumors.
