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
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, borohydride- reduced heparin(RO-heparin) 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 rolling on thioglycollate-induced rat mesenteric venules and L-selectin-metadiated neutrophil rolling 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 internal 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 internal 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-selectin 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 L-selectin from cytoplasm granules that do not depend on protein synthesis.展开更多
L-selectin plays a crucial role in inflammation cascade by initiating the tethering and rolling of leukocytes on endothelium wall. While many L-selectin molecules are rapidly shed from the cell surface upon activation...L-selectin plays a crucial role in inflammation cascade by initiating the tethering and rolling of leukocytes on endothelium wall. While many L-selectin molecules are rapidly shed from the cell surface upon activation, the remaining membrane-anchored L-selectin may still play an important role in regulating leukocyte rolling and adhesion with different binding kinetics. Here we developed an in vitro model to activate Jurkat cells via interlukin-8 (IL-8) and quantified the two-dimensional (2D) binding kinetics, using a micropipette aspiration assay, of membrane-anchored L-selectin to P-selectin glycoprotein ligand 1 (PSGL-1) ligand coupled onto human red blood cells (RBCs). The data indicated that L-selectin shedding reduced the amount of membrane-anchored L-selectin and lowered both its reverse and forward rates. These results suggested that the rolling dynamics of activated leukocytes was determined by two opposite impacts: reducing the surface presentation would enhance the rolling but lowering the kinetic rates would decrease the rolling. This finding provides a new insight into under-standing how L-selectin shedding regulates leukocyte rolling and adhesion.展开更多
目的探讨炎症与急性脑梗死患者脑白质高信号(WMH)的关系。方法纳入2017年10月至2022年4月我院神经内科住院的急性脑梗死机械取栓术治疗的患者130例,根据Fazekas量表评分分为低WMH负荷组80例(Fazekas评分0~2分)和高WMH负荷组(Fazekas评分...目的探讨炎症与急性脑梗死患者脑白质高信号(WMH)的关系。方法纳入2017年10月至2022年4月我院神经内科住院的急性脑梗死机械取栓术治疗的患者130例,根据Fazekas量表评分分为低WMH负荷组80例(Fazekas评分0~2分)和高WMH负荷组(Fazekas评分≥3分)50例,收集所有患者入院时病史、影像等基线资料,检测血清可溶性肿瘤坏死因子受体1(sTNFR1)、可溶性致癌抑制因子2(sST2)、可溶性P选择素(sP-selectin)、血管细胞黏附分子1(VCAM-1)等水平。用多因素logistic回归分析急性脑梗死患者的炎性因子与WMH负荷的独立相关性。结果高WMH负荷组sP-selectin明显低于低WMH负荷组[243.5(213.9,367.8)μg/L vs 287.6(225.1,400.4)μg/L,P=0.040],sST2[93.8(65.4,157.3)μg/L vs 64.0(40.6,100.5)μg/L]、sTNFR1[37.3(24.6,49.5)ng/L vs 24.9(18.8,35.3)ng/L]、VCAM-1[24.1(19.1,30.4)μg/L vs 20.5(16.1,30.6)μg/L]明显高于低WMH负荷组,差异有统计学意义(P<0.05,P<0.01)。校正年龄、性别、脑卒中前mRS评分>2分、高血压、当前吸烟、脑卒中病因和Alberta卒中项目早期CT评分后,多因素logistic回归分析显示,高WMH负荷与血清sP-selectin、sST2、sTNFR1、VCAM-1无相关性(P>0.05)。结论高WMH负荷与急性脑梗死的特异性炎性反应无相关性。展开更多
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, borohydride- reduced heparin(RO-heparin) 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 rolling on thioglycollate-induced rat mesenteric venules and L-selectin-metadiated neutrophil rolling 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 internal 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-selectin 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 L-selectin from cytoplasm granules that do not depend on protein synthesis.
基金Supported by the National Basic Research Program of China (Grant No. 2006CB910303)National Natural Science Foundation of China (Grant Nos. 30730032, 10332060)+1 种基金Knowledge Innovation Program of Chinese Academy of Sciences (Grant No. KJCX2-YW-L08)National High-Tech Research and De-velopment Program of China (Grant No. 2007AA02Z306)
文摘L-selectin plays a crucial role in inflammation cascade by initiating the tethering and rolling of leukocytes on endothelium wall. While many L-selectin molecules are rapidly shed from the cell surface upon activation, the remaining membrane-anchored L-selectin may still play an important role in regulating leukocyte rolling and adhesion with different binding kinetics. Here we developed an in vitro model to activate Jurkat cells via interlukin-8 (IL-8) and quantified the two-dimensional (2D) binding kinetics, using a micropipette aspiration assay, of membrane-anchored L-selectin to P-selectin glycoprotein ligand 1 (PSGL-1) ligand coupled onto human red blood cells (RBCs). The data indicated that L-selectin shedding reduced the amount of membrane-anchored L-selectin and lowered both its reverse and forward rates. These results suggested that the rolling dynamics of activated leukocytes was determined by two opposite impacts: reducing the surface presentation would enhance the rolling but lowering the kinetic rates would decrease the rolling. This finding provides a new insight into under-standing how L-selectin shedding regulates leukocyte rolling and adhesion.
文摘目的:分析基于降钙素原(procalcitonin,PCT)、肾动脉阻力指数(renal resistance index,RRI)、L选择素(CD62L)等实验室指标早期预测脓毒症急性肾损伤(sepsis-associated acute kidney injury,SA-AKI)的能力,为脓毒症患者急性肾损伤的早发现、早诊断、早治疗提供参考。方法:选取2020年8月—2022年5月医院收治的80例脓毒症患者作为研究对象,根据是否发生SA-AKI将患者分为发生组(n=30)和未发生组(n=50);收集患者的一般资料和CD62L、PCT、RRI水平,建立模型,分析CD62L、PCT与RRI联合检测对SA-AKI的早期预测能力。结果:发生组患者的PCT、CD62L和RRI均高于未发生组(P<0.05);PCT、CD62L、RRI联合检测预测SA-AKI的曲线下面积(area under the curve,AUC)值(0.992)高于单一预测的AUC值(0.882、0.943、0.911);且联合检测灵敏度、特异度、约登指数均高于单一检测。结论:基于PCT、CD62L、RRI等指标可较为准确地预测SA-AKI是否发生,且综合3种指标可以更准确地预知SA-AKI,从而有利于SA-AKI患者的成功救治。
文摘目的探讨炎症与急性脑梗死患者脑白质高信号(WMH)的关系。方法纳入2017年10月至2022年4月我院神经内科住院的急性脑梗死机械取栓术治疗的患者130例,根据Fazekas量表评分分为低WMH负荷组80例(Fazekas评分0~2分)和高WMH负荷组(Fazekas评分≥3分)50例,收集所有患者入院时病史、影像等基线资料,检测血清可溶性肿瘤坏死因子受体1(sTNFR1)、可溶性致癌抑制因子2(sST2)、可溶性P选择素(sP-selectin)、血管细胞黏附分子1(VCAM-1)等水平。用多因素logistic回归分析急性脑梗死患者的炎性因子与WMH负荷的独立相关性。结果高WMH负荷组sP-selectin明显低于低WMH负荷组[243.5(213.9,367.8)μg/L vs 287.6(225.1,400.4)μg/L,P=0.040],sST2[93.8(65.4,157.3)μg/L vs 64.0(40.6,100.5)μg/L]、sTNFR1[37.3(24.6,49.5)ng/L vs 24.9(18.8,35.3)ng/L]、VCAM-1[24.1(19.1,30.4)μg/L vs 20.5(16.1,30.6)μg/L]明显高于低WMH负荷组,差异有统计学意义(P<0.05,P<0.01)。校正年龄、性别、脑卒中前mRS评分>2分、高血压、当前吸烟、脑卒中病因和Alberta卒中项目早期CT评分后,多因素logistic回归分析显示,高WMH负荷与血清sP-selectin、sST2、sTNFR1、VCAM-1无相关性(P>0.05)。结论高WMH负荷与急性脑梗死的特异性炎性反应无相关性。
