Selectins are carbohydrate-binding cell adhesion molecules that play a major role in the initiation of inflammatory responses. Accumulaed evidence has suggested that heparin＇s anti-inflammatory effects are mainly med...Selectins are carbohydrate-binding cell adhesion molecules that play a major role in the initiation of inflammatory responses. Accumulaed evidence has suggested that heparin＇s anti-inflammatory effects are mainly mediated by blocking L-or P-selectin-initiated cell adhesion. Recently, we have reported that periodate-oxidized, borohydridereduced heparin （RO-heparln） can inhibit P-selectin-mediated acute inflammation. Here we further examined the effect of RO-heparin on the adhesion of L-selectin-mediated leukocytes to vascular endothelium under flow conditions in vivo and in vitro. The results show that RO-heparin with a low anticoagulant activity can effectively reduce leucocyte roiling on thioglycoUate-induced rat mesenterlc venules and L-selectin-metadiated neutrophil roiling on TNF-α-induced human umbilical vein endothelial cells（HUVECs） under flow conditions. Our findings suggest that the effect of RO-heparin on inflammatory responses is mainly a result of its inhibiting the interaction between P- or L-selectin and its ligands. The findings also suggest that RO-heparin may be useful in preventing inflammation diseases.展开更多
Objective： To compare carotid catheters blooddrawing and tail-cut blooddrawing in traumatizing rats and changing their intemal L-selectin. Methods： Two ways of bloodletting were selected to produce hemorrhagic shock...Objective： To compare carotid catheters blooddrawing and tail-cut blooddrawing in traumatizing rats and changing their intemal L-selectin. Methods： Two ways of bloodletting were selected to produce hemorrhagic shock models. Monoclonal antibody sign and flow cytometer were used to test neutrophil L-selectin dynamic expression in rats. Results： No remarkable differences were shown among different time points in neutrophil L-selectin expressing amount （ average fluorescence index） （ P 〉 0.05）. Compared with the normal control group, all cell surface expressions in empirical control group increased. Cell surface expressions reached the summit at 3 hours and kept the high level at 4-5 hours. A progressive increase of the mRNA expression peaked at 5 hours; the expressions in both groups of carotid catheters blooddrawing increased compared with normal control group, and remained stable after 3 hours compared with the Tail-cut Blooddrawing Group. Conclusion： L-sclectin expressions changed little in tail-cut blooddrawing rats, while carotid catheters resulted moderate or sever trauma. Therefore, it was suggested that it should not be set as hemorrhagic shock control model. As neutrophil L-selection expressions increased after trauma, the adhesion of leucocytes to the venule wall may be beneficial to the healing of wound and enhance the ability of anti-infection. The immediate increasing of neutrophil surface L-selectin expressions in this study was likely due to the direct release of Lselectin from cytoplasm granules that do not depend on protein synthesis.展开更多
Background: L-selectin (CD62L) is a cell surface adhesion molecule recently shown to play a critical role in determining endometrial receptivity and implantation in humans. By contrast, the L-selectin ligand is missin...Background: L-selectin (CD62L) is a cell surface adhesion molecule recently shown to play a critical role in determining endometrial receptivity and implantation in humans. By contrast, the L-selectin ligand is missing from the rodent endometrium. Interestingly, CD62L (L-selectin)-deficient BALB/c mice delivered significantly higher numbers of viable offspring than wild type controls via mechanisms yet to be defined. Methods: Nulliparous CD62L-deficient (8-10-week-old, n = 25) or wild type (n = 18) females were mated with 43 age-matched males. Animals were sacrificed at gestational day (GD) 9.5. Tissue samples were analyzed by immunostaining and flow cytometry. Results: Mating wild type and CD62L-deficient BALB/c mice revealed that the increased birth rate was due to the CD62L deficiency in females. Flow cytometric analysis demonstrated significant differences in the number of natural killer (NK) cells present in the uterus of pregnant CD62L- deficient mice compared to controls. Immunohistochemistry confirmed NK cell accumulation at the fetal-maternal interface. Discussion: Uterine NK cells have been shown to peak at GD 8-10 at the fetal-maternal interface. NK cells might regulate mouse fertility rates by facilitating development of the maternal spiral arteries, thereby stimulating the formation of larger vessels that facilitate intrauterine survival, however, their role is not obligate to spiral artery development. Conclusions: Diminished CD62L expression modified immune cell trafficking into the uterus of pregnant mice generating a microenvironment primarily dominated by NK cells resulting in improved embryonic survival rates.展开更多
背景与目的:结直肠癌是常见的消化系统恶性肿瘤,严重威胁着人类的健康。虽然现代诊疗技术不断发展,但近年来结直肠癌的发病率和病死率仍呈逐年上升趋势,早期诊断和防治肝转移有助于提高结直肠癌患者的生存率,对改善其预后有重要意义。P...背景与目的:结直肠癌是常见的消化系统恶性肿瘤,严重威胁着人类的健康。虽然现代诊疗技术不断发展,但近年来结直肠癌的发病率和病死率仍呈逐年上升趋势,早期诊断和防治肝转移有助于提高结直肠癌患者的生存率,对改善其预后有重要意义。P-选择素和L-选择素是近年肿瘤研究领域倍受关注的分子,其表达量及介导的黏附作用的改变在肿瘤细胞转移中起着重要作用,但2者与结直肠癌发生及临床分期的关系鲜见报道。本研究旨在探讨结直肠癌患者手术前后血清中P-选择素和L-选择素水平高低与临床病理特征的相关性。方法:选择132例结直肠癌患者及与其性别年龄相匹配的100名健康体检者。采用酶联免疫吸附试验(enzyme-linked immunosorbent assay,ELISA)检测132例结直肠癌患者手术前后血清中P-选择素和L-选择素浓度,100名健康体检者为对照组,结合临床病理特征对P-选择素和L-选择素水平的变化进行分析。结果:结直肠癌患者术前血清P-选择素和L-选择素水平显著高于对照组(75.2±13.3 vs 26.6±9.6,89.2±12.7 vs33.9±8.3,P<0.05);术后1周P-选择素和L-选择素水平较术前没有明显下降(63.8±11.1 vs 75.2±13.3,71.5±10.9 vs 89.2±12.7,P>0.05);而术后3个月则明显下降,与术前比较差异有统计学意义(34.8±10.4vs 75.2±13.3,40.1±9.5 vs 89.2±12.7,P<0.01);本组结直肠癌患者,临床分期越高,P-选择素和L-选择素水平越高,其水平与肿瘤浸润深度、Dukes分期、组织学分级和淋巴结转移相关,而与年龄、性别及肿瘤部位无明显相关(P>0.05);同时,同一结直肠癌患者血清中P-选择素和L-选择素的表达无显著相关(r=4.114,P>0.05)。结论:血清中P-选择素和L-选择素的水平在一定程度上反映了结直肠癌的侵袭、浸润和淋巴结转移的程度,可作为预测结直肠癌发展及预后的重要指标。展开更多
文摘Selectins are carbohydrate-binding cell adhesion molecules that play a major role in the initiation of inflammatory responses. Accumulaed evidence has suggested that heparin＇s anti-inflammatory effects are mainly mediated by blocking L-or P-selectin-initiated cell adhesion. Recently, we have reported that periodate-oxidized, borohydridereduced heparin （RO-heparln） can inhibit P-selectin-mediated acute inflammation. Here we further examined the effect of RO-heparin on the adhesion of L-selectin-mediated leukocytes to vascular endothelium under flow conditions in vivo and in vitro. The results show that RO-heparin with a low anticoagulant activity can effectively reduce leucocyte roiling on thioglycoUate-induced rat mesenterlc venules and L-selectin-metadiated neutrophil roiling on TNF-α-induced human umbilical vein endothelial cells（HUVECs） under flow conditions. Our findings suggest that the effect of RO-heparin on inflammatory responses is mainly a result of its inhibiting the interaction between P- or L-selectin and its ligands. The findings also suggest that RO-heparin may be useful in preventing inflammation diseases.
文摘Objective： To compare carotid catheters blooddrawing and tail-cut blooddrawing in traumatizing rats and changing their intemal L-selectin. Methods： Two ways of bloodletting were selected to produce hemorrhagic shock models. Monoclonal antibody sign and flow cytometer were used to test neutrophil L-selectin dynamic expression in rats. Results： No remarkable differences were shown among different time points in neutrophil L-selectin expressing amount （ average fluorescence index） （ P 〉 0.05）. Compared with the normal control group, all cell surface expressions in empirical control group increased. Cell surface expressions reached the summit at 3 hours and kept the high level at 4-5 hours. A progressive increase of the mRNA expression peaked at 5 hours; the expressions in both groups of carotid catheters blooddrawing increased compared with normal control group, and remained stable after 3 hours compared with the Tail-cut Blooddrawing Group. Conclusion： L-sclectin expressions changed little in tail-cut blooddrawing rats, while carotid catheters resulted moderate or sever trauma. Therefore, it was suggested that it should not be set as hemorrhagic shock control model. As neutrophil L-selection expressions increased after trauma, the adhesion of leucocytes to the venule wall may be beneficial to the healing of wound and enhance the ability of anti-infection. The immediate increasing of neutrophil surface L-selectin expressions in this study was likely due to the direct release of Lselectin from cytoplasm granules that do not depend on protein synthesis.
文摘Background: L-selectin (CD62L) is a cell surface adhesion molecule recently shown to play a critical role in determining endometrial receptivity and implantation in humans. By contrast, the L-selectin ligand is missing from the rodent endometrium. Interestingly, CD62L (L-selectin)-deficient BALB/c mice delivered significantly higher numbers of viable offspring than wild type controls via mechanisms yet to be defined. Methods: Nulliparous CD62L-deficient (8-10-week-old, n = 25) or wild type (n = 18) females were mated with 43 age-matched males. Animals were sacrificed at gestational day (GD) 9.5. Tissue samples were analyzed by immunostaining and flow cytometry. Results: Mating wild type and CD62L-deficient BALB/c mice revealed that the increased birth rate was due to the CD62L deficiency in females. Flow cytometric analysis demonstrated significant differences in the number of natural killer (NK) cells present in the uterus of pregnant CD62L- deficient mice compared to controls. Immunohistochemistry confirmed NK cell accumulation at the fetal-maternal interface. Discussion: Uterine NK cells have been shown to peak at GD 8-10 at the fetal-maternal interface. NK cells might regulate mouse fertility rates by facilitating development of the maternal spiral arteries, thereby stimulating the formation of larger vessels that facilitate intrauterine survival, however, their role is not obligate to spiral artery development. Conclusions: Diminished CD62L expression modified immune cell trafficking into the uterus of pregnant mice generating a microenvironment primarily dominated by NK cells resulting in improved embryonic survival rates.
文摘背景与目的:结直肠癌是常见的消化系统恶性肿瘤,严重威胁着人类的健康。虽然现代诊疗技术不断发展,但近年来结直肠癌的发病率和病死率仍呈逐年上升趋势,早期诊断和防治肝转移有助于提高结直肠癌患者的生存率,对改善其预后有重要意义。P-选择素和L-选择素是近年肿瘤研究领域倍受关注的分子,其表达量及介导的黏附作用的改变在肿瘤细胞转移中起着重要作用,但2者与结直肠癌发生及临床分期的关系鲜见报道。本研究旨在探讨结直肠癌患者手术前后血清中P-选择素和L-选择素水平高低与临床病理特征的相关性。方法:选择132例结直肠癌患者及与其性别年龄相匹配的100名健康体检者。采用酶联免疫吸附试验(enzyme-linked immunosorbent assay,ELISA)检测132例结直肠癌患者手术前后血清中P-选择素和L-选择素浓度,100名健康体检者为对照组,结合临床病理特征对P-选择素和L-选择素水平的变化进行分析。结果:结直肠癌患者术前血清P-选择素和L-选择素水平显著高于对照组(75.2±13.3 vs 26.6±9.6,89.2±12.7 vs33.9±8.3,P<0.05);术后1周P-选择素和L-选择素水平较术前没有明显下降(63.8±11.1 vs 75.2±13.3,71.5±10.9 vs 89.2±12.7,P>0.05);而术后3个月则明显下降,与术前比较差异有统计学意义(34.8±10.4vs 75.2±13.3,40.1±9.5 vs 89.2±12.7,P<0.01);本组结直肠癌患者,临床分期越高,P-选择素和L-选择素水平越高,其水平与肿瘤浸润深度、Dukes分期、组织学分级和淋巴结转移相关,而与年龄、性别及肿瘤部位无明显相关(P>0.05);同时,同一结直肠癌患者血清中P-选择素和L-选择素的表达无显著相关(r=4.114,P>0.05)。结论:血清中P-选择素和L-选择素的水平在一定程度上反映了结直肠癌的侵袭、浸润和淋巴结转移的程度,可作为预测结直肠癌发展及预后的重要指标。
