Breast cancer is the most frequently diagnosed cancer in women under 60, and the second most diagnosed cancer in women over 60. While significant </span><span style="font-family:Verdana;">progres...Breast cancer is the most frequently diagnosed cancer in women under 60, and the second most diagnosed cancer in women over 60. While significant </span><span style="font-family:Verdana;">progress has been made in developing targeted therapies for breast cancer,</span> <span style="font-family:Verdana;">advanced breast cancer continues to have high mortality, with poor 5-year</span> <span style="font-family:Verdana;">survival rates. Thus, current therapies are insufficient in treating advanced</span><span style="font-family:Verdana;"> stages of breast cancer;new treatments are sorely needed to address the complexity of advanced-stage breast cancer. Oncolytic virotherapy has been explored as a therapeutic approach capable of systemic administration, targeting cancer cells, and sparing normal tissue. In particular, oncolytic adenoviruses have been exploited as viral vectors due to their ease of manipulation, production, and demonstrated clinical safety profile. In this study, we engineered an oncolytic adenovirus to target the chemokine receptors CXCR4 and CXCR7. The overexpression of CXCR4 and CXCR7 is implicated in the initiation, survival, progress, and metastasis of breast cancer. Both receptors bind to the ligand, CXCL12 (SDF-1), which has been identified to play a crucial role in the metastasis of breast cancer cells. This study incorporated a T4 fibritin protein fused to CXCL12 into the tail domain of an adenovirus fiber </span><span style="font-family:Verdana;">to retarget the vector to the CXCR4 and CXCR7 chemokine receptors. We</span> <span style="font-family:Verdana;">showed that the modified virus targets and infects CXCR4- and CXCR7-</span><span style="font-family:Verdana;">overexpressing breast cancer cells more efficiently than a wild-type control</span><span style="font-family:Verdana;"> vector. In addition, the substitution of the wild-type fiber and knob with the modified chimeric fiber did not interfere with oncolytic capability. Overall, the results of this study demonstrate the feasibility of retargeting adenovirus vectors to chemokine receptor-positive tumors.展开更多
Classically,chemokines were described as small proteins driving leukocyte migration.Nonetheless,more and more studies are showing the great variety of cell functions and tissues in which they participate,including neu...Classically,chemokines were described as small proteins driving leukocyte migration.Nonetheless,more and more studies are showing the great variety of cell functions and tissues in which they participate,including neural cells.During the last years,research has highlighted the importance of chemokines in the nervous system,governing a wide range of processes (MesquidaVeny et al.,2021).This is evidenced for example by the crucial role played by CXCL12 during cortical development,or the homeostatic role of neuronal CX3CL1,preventing microglial activation.We are now certain that many chemokines and their receptors are widely expressed in neurons,and growing evidence has shown them as fundamental players in direct neuronal communication,both during homeostasis and after insult.展开更多
To review the implication of CXCR4 for gastrointestinal cancer, a ＂Pubmed＂ analysis was performed in order to evaluate the relevance of CXCR4 and its ligands for gastrointestinal cancers. Search terms applied were ...To review the implication of CXCR4 for gastrointestinal cancer, a ＂Pubmed＂ analysis was performed in order to evaluate the relevance of CXCR4 and its ligands for gastrointestinal cancers. Search terms applied were ＂cancer, malignoma, esophageal, gastric, colon, colorectal, hepatic, pancreatic, CXCR4, SDF- 1α, and SDF-1β＂. CXCR4 expression correlated with dissemination of diverse gastrointestinal malignomas. The CXCR4 ligand SDF-1α might act as ＂chemorepellent＂ while SDF-1β might act as ＂chemorepellent＂ for CTLs, inducing tumor rejection. The paracrine expression of SDF-1α was furthermore closely associated with neoangiogenesis. CXCR4 and its ligands influence the dissemination, immune rejection, and neoangiogenesis of human gastrointestinal cancers. Inhibition of CXCR4 might be an interesting therapeutic option.展开更多
Background: Recent studies indicate that C-X-C motif chemokine receptor 4(CXCR4) and its ligand, C-X-C motif chemokine ligand 12(CXCL12), stimulate expression of the cell cycle regulatory protein Cyclin D1 in neurofib...Background: Recent studies indicate that C-X-C motif chemokine receptor 4(CXCR4) and its ligand, C-X-C motif chemokine ligand 12(CXCL12), stimulate expression of the cell cycle regulatory protein Cyclin D1 in neurofibromatosis 1-associated malignant peripheral nerve sheath tumor(MPNST) cells and promote their proliferation. In this study, we measured the expression of CXCR4, CXCL12, and Cyclin D1 proteins in sporadic MPNST tissues from Chinese patients and investigated their prognostic values.Methods: CXCR4, CXCL12, and Cyclin D1 protein expression in samples from 58 Chinese patients with sporadic MPNST was assessed with immunohistochemical staining.Their prognostic values were evaluated with Kaplan-Meier analysis and a log-rank test. Multivariate Cox regression analysis was used to identify independent prognostic factors.Results: High expression of CXCR4, CXCL12, and Cyclin D1 was observed in 19(32.8%), 32(55.2%), and 16(27.6%)samples, respectively. CXCR4 expression was positively correlated with CXCL12 expression(r = 0.334, P = 0.010) and Cyclin D1 expression(r = 0.309, P = 0.018). Patients with high CXCR4 expression showed longer overall survival than those with low CXCR4 expression(χ~2 = 4.642, P = 0.031).Conclusion: High CXCR4 expression may define a specific subtype of sporadic MPNST with favorable prognosis.展开更多
OBJECTIVE To investigate whether CXCL12 and its receptor, CXCR7, play a role in lung cancer invasion and metastasis. METHODS Western blot and immunocytochemistry were used to detect CXCR7 protein expression in 8 lung ...OBJECTIVE To investigate whether CXCL12 and its receptor, CXCR7, play a role in lung cancer invasion and metastasis. METHODS Western blot and immunocytochemistry were used to detect CXCR7 protein expression in 8 lung cancer cell lines, EKVX, HOP62, HOP92, NCI-H23, NCI-H226, NCI- H322M, NCI-H446, and A549, and cell migration experiment was conducted to observe mobility of the lung cancer cells. The concentration of intracellular calcium in cytoplasm was measured under the fluorescence microscopy. RESULTS CXCR7 protein was positively expressed in the 8 lung cancer cell lines EKVX, HOP62, HOP92, NCI-H23, NCI-H226, NCI- H322M, NCI-H446, and A549. Following CXCL12 stimulation, obvious pseudopodia of lung cancer cells was observed under the microscope. The cell migration experiment showed that after incubation with CXCL12, the number of EKVX cells, which passed through the polycarbonate microporous filter membranes increased to a great extent. This phenomenon can be reversed by CXCR7-siRNA. After CXCL12 incubation, the intracellular Ca2＋ level in the EKVX cells was increased to a great extent. CONCLUSION Chemokine CXCL12 facilitates the migration of lung cancer cells by changing the concentration of intracellular Ca2＋. The CXCL12-CXCR7 axis may play an important role in lung cancer invasion and metastasis. It could be a potential target for lung cancer therapy and an effective way to prevent recurrence and metastasis of lung cancer.展开更多
Objective The expression of CXCL12(stromal cell-derived factor-1)-CXCR4(chemokine receptors-4) in osteosarcoma and its role in angiogenesis were examined.Methods The expression of CXCR4 and CXCL12 in 40 cases of osteo...Objective The expression of CXCL12(stromal cell-derived factor-1)-CXCR4(chemokine receptors-4) in osteosarcoma and its role in angiogenesis were examined.Methods The expression of CXCR4 and CXCL12 in 40 cases of osteosarcoma was detected by immunohistochemistry and real-time fluorescence quantitative PCR.The expression of CD34 in osteosarcoma was detected by immunohistochemistry.Morphometric image analysis was performed to measure microvessel density(MVD).Additionally,the relationship between CXCL12 and CXCR4 expression and MVD of osteosarcoma and pulmonary metastasis were analyzed.Results The positive rates of CXCL12 and CXCR4 protein expression in osteosarcoma were 40.0%(16/40) and 60.0%(24/40),respectively.Fluorescence quantitative real-time PCR indicated that the expression level of CXCR4 m RNA in pulmonary metastatic osteosarcoma was higher than that in nonpulmonary metastatic osteosarcoma(P < 0.01).The level of MVD in pulmonary metastatic osteosarcoma was higher than that in non-pulmonary metastatic osteosarcoma(P < 0.01).Conclusion The expression level of CXCR4 was significantly associated with pulmonary metastasis and angiogenesis of osteosarcoma.展开更多
Chemokines are an indispensable component of our immune system through the regulation of directional migration and activation of leukocytes.CxCL8 is the most potent human neutrophil-attracting chemokine and plays cruc...Chemokines are an indispensable component of our immune system through the regulation of directional migration and activation of leukocytes.CxCL8 is the most potent human neutrophil-attracting chemokine and plays crucial roles in the response to infection and tissue injury.CXCL8 activity inherently depends on interaction with the human CXC chemokine receptors CXCR1 and CXCR2,the atypical chemokine receptor ACKR1,and glycosaminoglycans.Furthermore,(hetero)dimerization and tight regulation of transcription and translation,as well as post-translational modifications further fine-tune the spatial and temporal activity of CXCL8 in the context of inflammatory diseases and cancer.The CxCL8 interaction with receptors and glycosaminoglycans is therefore a promising target for therapy,as illustrated by multiple ongoing clinical trials.CXCL8-mediated neutrophil mobilization to blood is directly opposed by CXCL12,which retains leukocytes in bone marrow.CXCL12 is primarily a homeostatic chemokine that induces migration and activation of hematopoietic progenitor cells,endothelial cells,and several leukocytes through interaction with CXCR4,ACKR1,and ACKR3.Thereby,it is an essential player in the regulation of embryogenesis,hematopoiesis,and angiogenesis.However,CXCL12 can also exert inflammatory functions,as illustrated by its pivotal role in a growing list of pathologies and its synergy with CXCL8 and other chemokines to induce leukocyte chemotaxis.Here,we review the plethora of information on the CXCL8 structure,interaction with receptors and glycosaminoglycans,different levels of activity regulation,role in homeostasis and disease,and therapeutic prospects.Finally,we discuss recent research on CXCL12 biochemistry and biology and its role in pathology and pharmacology.展开更多
Background Heart failure due to ischemic heart disease is still a major health problem. Myocardium regeneration emerges as a novel therapeutic method for treating myocardial infarction （MI）. However, it is affected ...Background Heart failure due to ischemic heart disease is still a major health problem. Myocardium regeneration emerges as a novel therapeutic method for treating myocardial infarction （MI）. However, it is affected by many factors. The present study was aimed to investigate the effect of chemokine stromal cell-derived factor 1 （SDF-1）/CXCL12 on mesenchymal stem cells （MSCs） homing to injured myocardium in a rat myocardial infarction model. Methods A rat myocardial infarction model was established by permanent left anterior descending branch ligation. Mesenchymal stem cells from donor rats were cultured in IMDM and labeled with bromodeoxyuridine. The rats were divided into two groups. SDF-1 expression was measured by in situ hybridization and immunohistochemistry in the sham operated or infarcted hearts at 1, 2, 4, 7, 14 and 28 days post operation in the SDF-1 detection group. The rats in the intervention groups were injected with SDF-1, anti-SDF-1 antibody or saline 4 days after myocardial infarction. Then, a total of 5×10^6 cells in 2.5 ml of phosphate-buffered saline were injected through the tail vein. The number of the labeled MSCs in the infarcted hearts was counted on the 3rd day post injection. Cardiac function and blood vessel density were assessed on the 28th day post injection. Results Self-generating SDF-1 expression was increased at the first day post MI, peaked at the 7th day and decreased thereafter while it remained unchanged in sham operated hearts. The MSCs enrichment in the host hearts were more abundant in the MI groups than in the non-MI group （P=0.000）; the MSCs enrichment in the host hearts were more abundant in the SDF-1 injected group than in the anti-SDF-1 antibody and saline injected groups （P = 0.000）. Cardiac function was improved more in the SDF-1 injected group than in the anti-SDF-1 antibody and saline injected groups （P = 0.000）. Neovascularization in the SDF-1 injected group increased significantly compared to the other groups （P= 0.000）. Conclusion Myocardial SDF-1 expression was increased only in the early phase post MI. SDF-1 may enhance MSCs homing to the injured heart and improve cardiac function by promoting neovascularization. Chin Med J 2009; 122（2）： 183-187展开更多
The CXC chemokine CXCL12 is an important factor in physiological and pathological processes, includingembryogenesis, hematopoiesis, angiogenesis and inflammation, because it activates and/or induces migration ofhemato...The CXC chemokine CXCL12 is an important factor in physiological and pathological processes, includingembryogenesis, hematopoiesis, angiogenesis and inflammation, because it activates and/or induces migration ofhematopoietic progenitor and stem cells, endothelial cells and most leukocytes. Therefore, CXCL12 activity istightly regulated at multiple levels. CXCL12 has the unique property of existing in six splice variants in humans,each having a specific tissue distribution and in vivo activity. Controlled splice variant transcription and mRNAstability determine the CXCL12 expression profile. CXCL12 fulfills its functions in homeostatic and pathologicalconditions by interacting with its receptors CXC chemokine receptor 4 (CXCR4) and atypical chemokine receptor 3(ACKR3) and by binding to glycosaminoglycans (GAGs) in tissues and on the endothelium to allow a properpresentation to passing leukocytes. Homodimerizaton and heterodimerization of CXCL12 and its receptors can altertheir signaling activity, as exemplified by the synergy between CXCL12 and other chemokines in leukocyte migrationassays. Receptor binding may also initiate CXCL12 internalization and its subsequent removal from theenvironment. Furthermore, CXCL12 activity is regulated by posttranslational modifications. Proteolytic removal ofNH2- or COOH-terminal amino acids, citrullination of arginine residues by peptidyl arginine deiminases or nitrationof tyrosine residues reduce CXCL12 activity. This review summarizes the interactions of CXCL12 with the cellularenvironment and discusses the different levels of CXCL12 activity regulation.展开更多
文摘Breast cancer is the most frequently diagnosed cancer in women under 60, and the second most diagnosed cancer in women over 60. While significant </span><span style="font-family:Verdana;">progress has been made in developing targeted therapies for breast cancer,</span> <span style="font-family:Verdana;">advanced breast cancer continues to have high mortality, with poor 5-year</span> <span style="font-family:Verdana;">survival rates. Thus, current therapies are insufficient in treating advanced</span><span style="font-family:Verdana;"> stages of breast cancer;new treatments are sorely needed to address the complexity of advanced-stage breast cancer. Oncolytic virotherapy has been explored as a therapeutic approach capable of systemic administration, targeting cancer cells, and sparing normal tissue. In particular, oncolytic adenoviruses have been exploited as viral vectors due to their ease of manipulation, production, and demonstrated clinical safety profile. In this study, we engineered an oncolytic adenovirus to target the chemokine receptors CXCR4 and CXCR7. The overexpression of CXCR4 and CXCR7 is implicated in the initiation, survival, progress, and metastasis of breast cancer. Both receptors bind to the ligand, CXCL12 (SDF-1), which has been identified to play a crucial role in the metastasis of breast cancer cells. This study incorporated a T4 fibritin protein fused to CXCL12 into the tail domain of an adenovirus fiber </span><span style="font-family:Verdana;">to retarget the vector to the CXCR4 and CXCR7 chemokine receptors. We</span> <span style="font-family:Verdana;">showed that the modified virus targets and infects CXCR4- and CXCR7-</span><span style="font-family:Verdana;">overexpressing breast cancer cells more efficiently than a wild-type control</span><span style="font-family:Verdana;"> vector. In addition, the substitution of the wild-type fiber and knob with the modified chimeric fiber did not interfere with oncolytic capability. Overall, the results of this study demonstrate the feasibility of retargeting adenovirus vectors to chemokine receptor-positive tumors.
基金HDAC3-EAE-SCI Project with ref.PID2020-119769RA-I00 from MCIN/AEI/10.13039/501100011033 to AH。
文摘Classically,chemokines were described as small proteins driving leukocyte migration.Nonetheless,more and more studies are showing the great variety of cell functions and tissues in which they participate,including neural cells.During the last years,research has highlighted the importance of chemokines in the nervous system,governing a wide range of processes (MesquidaVeny et al.,2021).This is evidenced for example by the crucial role played by CXCL12 during cortical development,or the homeostatic role of neuronal CX3CL1,preventing microglial activation.We are now certain that many chemokines and their receptors are widely expressed in neurons,and growing evidence has shown them as fundamental players in direct neuronal communication,both during homeostasis and after insult.
文摘To review the implication of CXCR4 for gastrointestinal cancer, a ＂Pubmed＂ analysis was performed in order to evaluate the relevance of CXCR4 and its ligands for gastrointestinal cancers. Search terms applied were ＂cancer, malignoma, esophageal, gastric, colon, colorectal, hepatic, pancreatic, CXCR4, SDF- 1α, and SDF-1β＂. CXCR4 expression correlated with dissemination of diverse gastrointestinal malignomas. The CXCR4 ligand SDF-1α might act as ＂chemorepellent＂ while SDF-1β might act as ＂chemorepellent＂ for CTLs, inducing tumor rejection. The paracrine expression of SDF-1α was furthermore closely associated with neoangiogenesis. CXCR4 and its ligands influence the dissemination, immune rejection, and neoangiogenesis of human gastrointestinal cancers. Inhibition of CXCR4 might be an interesting therapeutic option.
基金supported by the National Nature Science Foundation of China(81372872 to Jilong Yang,81672650 to Ze Zhu,and 81402215 to Xiaoling Du)funds from the University Cancer Foundation via the Sister Institution Network Fund(to Jilong Yang)
文摘Background: Recent studies indicate that C-X-C motif chemokine receptor 4(CXCR4) and its ligand, C-X-C motif chemokine ligand 12(CXCL12), stimulate expression of the cell cycle regulatory protein Cyclin D1 in neurofibromatosis 1-associated malignant peripheral nerve sheath tumor(MPNST) cells and promote their proliferation. In this study, we measured the expression of CXCR4, CXCL12, and Cyclin D1 proteins in sporadic MPNST tissues from Chinese patients and investigated their prognostic values.Methods: CXCR4, CXCL12, and Cyclin D1 protein expression in samples from 58 Chinese patients with sporadic MPNST was assessed with immunohistochemical staining.Their prognostic values were evaluated with Kaplan-Meier analysis and a log-rank test. Multivariate Cox regression analysis was used to identify independent prognostic factors.Results: High expression of CXCR4, CXCL12, and Cyclin D1 was observed in 19(32.8%), 32(55.2%), and 16(27.6%)samples, respectively. CXCR4 expression was positively correlated with CXCL12 expression(r = 0.334, P = 0.010) and Cyclin D1 expression(r = 0.309, P = 0.018). Patients with high CXCR4 expression showed longer overall survival than those with low CXCR4 expression(χ~2 = 4.642, P = 0.031).Conclusion: High CXCR4 expression may define a specific subtype of sporadic MPNST with favorable prognosis.
文摘OBJECTIVE To investigate whether CXCL12 and its receptor, CXCR7, play a role in lung cancer invasion and metastasis. METHODS Western blot and immunocytochemistry were used to detect CXCR7 protein expression in 8 lung cancer cell lines, EKVX, HOP62, HOP92, NCI-H23, NCI-H226, NCI- H322M, NCI-H446, and A549, and cell migration experiment was conducted to observe mobility of the lung cancer cells. The concentration of intracellular calcium in cytoplasm was measured under the fluorescence microscopy. RESULTS CXCR7 protein was positively expressed in the 8 lung cancer cell lines EKVX, HOP62, HOP92, NCI-H23, NCI-H226, NCI- H322M, NCI-H446, and A549. Following CXCL12 stimulation, obvious pseudopodia of lung cancer cells was observed under the microscope. The cell migration experiment showed that after incubation with CXCL12, the number of EKVX cells, which passed through the polycarbonate microporous filter membranes increased to a great extent. This phenomenon can be reversed by CXCR7-siRNA. After CXCL12 incubation, the intracellular Ca2＋ level in the EKVX cells was increased to a great extent. CONCLUSION Chemokine CXCL12 facilitates the migration of lung cancer cells by changing the concentration of intracellular Ca2＋. The CXCL12-CXCR7 axis may play an important role in lung cancer invasion and metastasis. It could be a potential target for lung cancer therapy and an effective way to prevent recurrence and metastasis of lung cancer.
文摘Objective The expression of CXCL12(stromal cell-derived factor-1)-CXCR4(chemokine receptors-4) in osteosarcoma and its role in angiogenesis were examined.Methods The expression of CXCR4 and CXCL12 in 40 cases of osteosarcoma was detected by immunohistochemistry and real-time fluorescence quantitative PCR.The expression of CD34 in osteosarcoma was detected by immunohistochemistry.Morphometric image analysis was performed to measure microvessel density(MVD).Additionally,the relationship between CXCL12 and CXCR4 expression and MVD of osteosarcoma and pulmonary metastasis were analyzed.Results The positive rates of CXCL12 and CXCR4 protein expression in osteosarcoma were 40.0%(16/40) and 60.0%(24/40),respectively.Fluorescence quantitative real-time PCR indicated that the expression level of CXCR4 m RNA in pulmonary metastatic osteosarcoma was higher than that in nonpulmonary metastatic osteosarcoma(P < 0.01).The level of MVD in pulmonary metastatic osteosarcoma was higher than that in non-pulmonary metastatic osteosarcoma(P < 0.01).Conclusion The expression level of CXCR4 was significantly associated with pulmonary metastasis and angiogenesis of osteosarcoma.
基金KU Leuven(C1 grant C16/17/010),FWO-Vlaanderen(grant GOF8822N)the Rega Foundation.SC received a PhD fellowship from FWO-Vlaanderen(grant number 11A4220N).Figures 2-5 are created with BioRender.com.
文摘Chemokines are an indispensable component of our immune system through the regulation of directional migration and activation of leukocytes.CxCL8 is the most potent human neutrophil-attracting chemokine and plays crucial roles in the response to infection and tissue injury.CXCL8 activity inherently depends on interaction with the human CXC chemokine receptors CXCR1 and CXCR2,the atypical chemokine receptor ACKR1,and glycosaminoglycans.Furthermore,(hetero)dimerization and tight regulation of transcription and translation,as well as post-translational modifications further fine-tune the spatial and temporal activity of CXCL8 in the context of inflammatory diseases and cancer.The CxCL8 interaction with receptors and glycosaminoglycans is therefore a promising target for therapy,as illustrated by multiple ongoing clinical trials.CXCL8-mediated neutrophil mobilization to blood is directly opposed by CXCL12,which retains leukocytes in bone marrow.CXCL12 is primarily a homeostatic chemokine that induces migration and activation of hematopoietic progenitor cells,endothelial cells,and several leukocytes through interaction with CXCR4,ACKR1,and ACKR3.Thereby,it is an essential player in the regulation of embryogenesis,hematopoiesis,and angiogenesis.However,CXCL12 can also exert inflammatory functions,as illustrated by its pivotal role in a growing list of pathologies and its synergy with CXCL8 and other chemokines to induce leukocyte chemotaxis.Here,we review the plethora of information on the CXCL8 structure,interaction with receptors and glycosaminoglycans,different levels of activity regulation,role in homeostasis and disease,and therapeutic prospects.Finally,we discuss recent research on CXCL12 biochemistry and biology and its role in pathology and pharmacology.
文摘Background Heart failure due to ischemic heart disease is still a major health problem. Myocardium regeneration emerges as a novel therapeutic method for treating myocardial infarction （MI）. However, it is affected by many factors. The present study was aimed to investigate the effect of chemokine stromal cell-derived factor 1 （SDF-1）/CXCL12 on mesenchymal stem cells （MSCs） homing to injured myocardium in a rat myocardial infarction model. Methods A rat myocardial infarction model was established by permanent left anterior descending branch ligation. Mesenchymal stem cells from donor rats were cultured in IMDM and labeled with bromodeoxyuridine. The rats were divided into two groups. SDF-1 expression was measured by in situ hybridization and immunohistochemistry in the sham operated or infarcted hearts at 1, 2, 4, 7, 14 and 28 days post operation in the SDF-1 detection group. The rats in the intervention groups were injected with SDF-1, anti-SDF-1 antibody or saline 4 days after myocardial infarction. Then, a total of 5×10^6 cells in 2.5 ml of phosphate-buffered saline were injected through the tail vein. The number of the labeled MSCs in the infarcted hearts was counted on the 3rd day post injection. Cardiac function and blood vessel density were assessed on the 28th day post injection. Results Self-generating SDF-1 expression was increased at the first day post MI, peaked at the 7th day and decreased thereafter while it remained unchanged in sham operated hearts. The MSCs enrichment in the host hearts were more abundant in the MI groups than in the non-MI group （P=0.000）; the MSCs enrichment in the host hearts were more abundant in the SDF-1 injected group than in the anti-SDF-1 antibody and saline injected groups （P = 0.000）. Cardiac function was improved more in the SDF-1 injected group than in the anti-SDF-1 antibody and saline injected groups （P = 0.000）. Neovascularization in the SDF-1 injected group increased significantly compared to the other groups （P= 0.000）. Conclusion Myocardial SDF-1 expression was increased only in the early phase post MI. SDF-1 may enhance MSCs homing to the injured heart and improve cardiac function by promoting neovascularization. Chin Med J 2009; 122（2）： 183-187
基金This research was supported by the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office(I.A.P.Project 7/40)the Fund for Scientific Research of Flanders(FWOVlaanderen Projects G.0D25.17N,G.0764.14,and G.0D66.13)+1 种基金the Concerted Research Actions of the Regional Government of Flanders(GOA/12/017)C1 funding(C16/17/010)of KU Leuven.
文摘The CXC chemokine CXCL12 is an important factor in physiological and pathological processes, includingembryogenesis, hematopoiesis, angiogenesis and inflammation, because it activates and/or induces migration ofhematopoietic progenitor and stem cells, endothelial cells and most leukocytes. Therefore, CXCL12 activity istightly regulated at multiple levels. CXCL12 has the unique property of existing in six splice variants in humans,each having a specific tissue distribution and in vivo activity. Controlled splice variant transcription and mRNAstability determine the CXCL12 expression profile. CXCL12 fulfills its functions in homeostatic and pathologicalconditions by interacting with its receptors CXC chemokine receptor 4 (CXCR4) and atypical chemokine receptor 3(ACKR3) and by binding to glycosaminoglycans (GAGs) in tissues and on the endothelium to allow a properpresentation to passing leukocytes. Homodimerizaton and heterodimerization of CXCL12 and its receptors can altertheir signaling activity, as exemplified by the synergy between CXCL12 and other chemokines in leukocyte migrationassays. Receptor binding may also initiate CXCL12 internalization and its subsequent removal from theenvironment. Furthermore, CXCL12 activity is regulated by posttranslational modifications. Proteolytic removal ofNH2- or COOH-terminal amino acids, citrullination of arginine residues by peptidyl arginine deiminases or nitrationof tyrosine residues reduce CXCL12 activity. This review summarizes the interactions of CXCL12 with the cellularenvironment and discusses the different levels of CXCL12 activity regulation.
