AIM： To analyze the localization of erythropoietin receptor on gastric specimens and characterize the effects of erythropoietin on the normal gastric epithelial proliferation using a porcine gastric epithelial cell c...AIM： To analyze the localization of erythropoietin receptor on gastric specimens and characterize the effects of erythropoietin on the normal gastric epithelial proliferation using a porcine gastric epithelial cell culture model. METHODS： Erythropoietin receptor was detected by RT-PCR, Western blotting and immunohistochermistry. Growth stimulation effects of erythropoietin on cultured gastric mucosal cells were determined by ELISA using bromodeoxyuridine （BrdU）. RESULTS： Erythropoietin receptor was detected on cultured porcine gastric mucosal epithelial cells. Erythropoietin receptor was also detected histochemically at the base of gastric mucosal epithelium. BrdU assay demonstrated a dose-dependent increase in growth potential of cultured porcine gastric mucosal epithelial cells by administration of erythropoietin, as well as these effects were inhibited by administration of antierythropoietin antibody （P〈 0.01）. CONCLUSION： These findings indicate that erythropoietin has a potential to proliferate gastric mucosal epithelium via erythropoietin receptor.展开更多
Erythropoietin (Epo) is the regulator of red blood cell formation. Its receptor (EpoR) is now found in many cells and tissues of the body. EpoR is also shown to occur in tumor cells and Epo enhances the proliferation ...Erythropoietin (Epo) is the regulator of red blood cell formation. Its receptor (EpoR) is now found in many cells and tissues of the body. EpoR is also shown to occur in tumor cells and Epo enhances the proliferation of these cells through cell signaling. EpoR antagonist can reduce the growth of the tumor in vivo. In view of our current knowledge of Epo, its recombinant forms and receptor, use of Epo in cancer patients to enhance the recovery of hematocrit after chemotherapy treatment has to be carefully evaluated.展开更多
Objective To investigate the distribution of erythropoietin （EPO） and erythropoietin receptor （ EPOR ） expression in the postnatal rat retina development. Methods Forty-two male Sprague-Dawley rats were divided in...Objective To investigate the distribution of erythropoietin （EPO） and erythropoietin receptor （ EPOR ） expression in the postnatal rat retina development. Methods Forty-two male Sprague-Dawley rats were divided into 7 groups according to their various postnatal days： postnatal 1 d （D1 group）, 3 d （D3 group）, I week （W1 group）, 2 weeks （W2 group）, 3 weeks （W3 group）, 4 weeks （W4 group） and8 weeks （W8 group） （ n = 6 ）. Single eye was randomly chosen from each rat for the study. The retinal sections were stained with hematoxylin and eosin （HE） and used for the retina development observation. Immunohistochemical staining was used to localize EPO and EPOR expressions in retinas.of differentstages of development, and the expression intensities were determined by an image plus 4 program~~ Results The retinal inner nuclear layer （INL） and outer nuclear layer （ONL） were mixed together and had not yet fully differentiated in D1 and D3 groups. The INL and ONL formed their own independent regions and the outer plexiform layer （OPL） appeared between two layers in W1 group. With the postnatal retinal development, the inner plexiform layer （ IPL ） , rods and cones layer （ RCL ）, and OPL were gradually widened and stabilized in W2 to W3 groups. EPO/EPOR expressions located prominently in the inner part of the postnatal rat developing retinas. The expression of EPO in GCL and INL gradually increased from DI to W4, then the expression decreased in W8. Expression of EPOR in GCL gradually increased from DI to WI , then decreased in W2 ; and it gradually increased again from W3 to W8. Expression of EPOR in INL gradually increased from D1 to W1, then decreased in W2 ; and it continued to decrease from W3 to W8. Expression of EPOR in the external segment of RCL gradually increased from D1 to W8. However, expression in the internal segment of RCL gradually decreased from D1 to W3 , then no obvious expression was seen in the internal segment of RCL in W4 and W8. Conclusion EPO/EPOR expressions locate prominently in the inner part of the postnatal rat developing retina. And EPO/EPOR expressions in the rat retinas exist the dynamic changes during the postnatal retina development period.展开更多
AIM: To investigate the expression of Erythropoietin (Epo) and its receptor (EpoR) in gastric adenocarcinoma (GAC) and the correlation with angiogenesis and clinicopathological features. METHODS: The expressions of Ep...AIM: To investigate the expression of Erythropoietin (Epo) and its receptor (EpoR) in gastric adenocarcinoma (GAC) and the correlation with angiogenesis and clinicopathological features. METHODS: The expressions of Epo, EpoR and vascular endothelial growth factor (VEGF), as well as mi-crovessel density were evaluated in 172 GAC biopsies by immunohistochemical staining. The correlations between these parameters and patient’s clinicopathological features were analyzed statistically. RESULTS: The proportion of Epo and EpoR alterations in GAC was higher than that in adjacent normal mucosa (P = 0.035 and 0.030). Epo high-expression was associ-ated with EpoR high-expression, Lauren type, extensivelymph node metastasis and advanced stage of GAC (P = 0.018, 0.018, 0.004 and 0), while EpoR expression was linked with older age, World Health Organization type, extensive lymph node metastasis and advanced stage (P = 0.001, 0.013, 0.008 and 0.001). VEGF high expression was significantly correlated with EpoR low-expression, Lauren type, extensive lymph node metastasis and advanced stage (P = 0.001, 0.001, 0.001 and 0.007). The expression of Epo or EpoR was associated with microvessel density (P = 0.004 and 0.046). On multivariate analysis, only lymph node metastasis, abnormal Epo expression and tumor nodes metastases stage were independently associated with survival. In addition, a strong association with the immunohistochemical expression of EpoR and the angiogenic protein, VEGF, was noted. CONCLUSION: Increased expression of Epo and EpoR may play a signif icant role in the carcinogenesis, angiogenesis and progression of GAC. Epo may be an inde-pendent prognostic factor.展开更多
基金Supported by the grants from National Defense Medical College.
文摘AIM： To analyze the localization of erythropoietin receptor on gastric specimens and characterize the effects of erythropoietin on the normal gastric epithelial proliferation using a porcine gastric epithelial cell culture model. METHODS： Erythropoietin receptor was detected by RT-PCR, Western blotting and immunohistochermistry. Growth stimulation effects of erythropoietin on cultured gastric mucosal cells were determined by ELISA using bromodeoxyuridine （BrdU）. RESULTS： Erythropoietin receptor was detected on cultured porcine gastric mucosal epithelial cells. Erythropoietin receptor was also detected histochemically at the base of gastric mucosal epithelium. BrdU assay demonstrated a dose-dependent increase in growth potential of cultured porcine gastric mucosal epithelial cells by administration of erythropoietin, as well as these effects were inhibited by administration of antierythropoietin antibody （P〈 0.01）. CONCLUSION： These findings indicate that erythropoietin has a potential to proliferate gastric mucosal epithelium via erythropoietin receptor.
基金Supported in part by the funds from Central Arkansas Veterans Healthcare System
文摘Erythropoietin (Epo) is the regulator of red blood cell formation. Its receptor (EpoR) is now found in many cells and tissues of the body. EpoR is also shown to occur in tumor cells and Epo enhances the proliferation of these cells through cell signaling. EpoR antagonist can reduce the growth of the tumor in vivo. In view of our current knowledge of Epo, its recombinant forms and receptor, use of Epo in cancer patients to enhance the recovery of hematocrit after chemotherapy treatment has to be carefully evaluated.
文摘Objective To investigate the distribution of erythropoietin （EPO） and erythropoietin receptor （ EPOR ） expression in the postnatal rat retina development. Methods Forty-two male Sprague-Dawley rats were divided into 7 groups according to their various postnatal days： postnatal 1 d （D1 group）, 3 d （D3 group）, I week （W1 group）, 2 weeks （W2 group）, 3 weeks （W3 group）, 4 weeks （W4 group） and8 weeks （W8 group） （ n = 6 ）. Single eye was randomly chosen from each rat for the study. The retinal sections were stained with hematoxylin and eosin （HE） and used for the retina development observation. Immunohistochemical staining was used to localize EPO and EPOR expressions in retinas.of differentstages of development, and the expression intensities were determined by an image plus 4 program~~ Results The retinal inner nuclear layer （INL） and outer nuclear layer （ONL） were mixed together and had not yet fully differentiated in D1 and D3 groups. The INL and ONL formed their own independent regions and the outer plexiform layer （OPL） appeared between two layers in W1 group. With the postnatal retinal development, the inner plexiform layer （ IPL ） , rods and cones layer （ RCL ）, and OPL were gradually widened and stabilized in W2 to W3 groups. EPO/EPOR expressions located prominently in the inner part of the postnatal rat developing retinas. The expression of EPO in GCL and INL gradually increased from DI to W4, then the expression decreased in W8. Expression of EPOR in GCL gradually increased from DI to WI , then decreased in W2 ; and it gradually increased again from W3 to W8. Expression of EPOR in INL gradually increased from D1 to W1, then decreased in W2 ; and it continued to decrease from W3 to W8. Expression of EPOR in the external segment of RCL gradually increased from D1 to W8. However, expression in the internal segment of RCL gradually decreased from D1 to W3 , then no obvious expression was seen in the internal segment of RCL in W4 and W8. Conclusion EPO/EPOR expressions locate prominently in the inner part of the postnatal rat developing retina. And EPO/EPOR expressions in the rat retinas exist the dynamic changes during the postnatal retina development period.
文摘AIM: To investigate the expression of Erythropoietin (Epo) and its receptor (EpoR) in gastric adenocarcinoma (GAC) and the correlation with angiogenesis and clinicopathological features. METHODS: The expressions of Epo, EpoR and vascular endothelial growth factor (VEGF), as well as mi-crovessel density were evaluated in 172 GAC biopsies by immunohistochemical staining. The correlations between these parameters and patient’s clinicopathological features were analyzed statistically. RESULTS: The proportion of Epo and EpoR alterations in GAC was higher than that in adjacent normal mucosa (P = 0.035 and 0.030). Epo high-expression was associ-ated with EpoR high-expression, Lauren type, extensivelymph node metastasis and advanced stage of GAC (P = 0.018, 0.018, 0.004 and 0), while EpoR expression was linked with older age, World Health Organization type, extensive lymph node metastasis and advanced stage (P = 0.001, 0.013, 0.008 and 0.001). VEGF high expression was significantly correlated with EpoR low-expression, Lauren type, extensive lymph node metastasis and advanced stage (P = 0.001, 0.001, 0.001 and 0.007). The expression of Epo or EpoR was associated with microvessel density (P = 0.004 and 0.046). On multivariate analysis, only lymph node metastasis, abnormal Epo expression and tumor nodes metastases stage were independently associated with survival. In addition, a strong association with the immunohistochemical expression of EpoR and the angiogenic protein, VEGF, was noted. CONCLUSION: Increased expression of Epo and EpoR may play a signif icant role in the carcinogenesis, angiogenesis and progression of GAC. Epo may be an inde-pendent prognostic factor.
