Desiccating human red blood cells (RBCs) to increase their storage life has been the subject of intense research for a number of years. However, drying RBCs invariably compromises their integrity and has detrimental e...Desiccating human red blood cells (RBCs) to increase their storage life has been the subject of intense research for a number of years. However, drying RBCs invariably compromises their integrity and has detrimental effects on hemoglobin function due to autoxidation. We have previously demonstrated an RBC desiccation and rehydration process that preserves RBC antigenic epitopes better than frozen RBCs. This study expands on those observations by examining what effects this desiccation process has on RBC hemoglobin function with respect to oxygen binding properties. In this paper, we examined RBCs from normal donors which were desiccated to 25% moisture content and stored dry for 2 weeks at room temperature prior to rehydration with plasma followed by structural and functional studies. Our data showed that approximately 98% of the RBCs were intact upon rehydration based on hemolysis assays. Oxygen dissociation curves for the desiccated/rehydrated RBCs showed a left shift compared to fresh RBCs (pO2 = 17 mmHg vs. 26 mmHg, respectively). The desiccated/rehydrated RBCs also showed an increase in methemoglobin compared to fresh RBCs (4.5% vs 0.9%, respectively). 2,3-Diphosphoglycerate concentration of the desiccated/rehydrated RBCs was reduced by 20%. In conclusion, although this RBC dehydration process preserves RBC integrity and hemoglobin oxygen binding properties better than most other dehydration techniques described so far, further optimization and long-term studies are needed to make this procedure acceptable for human transfusion.展开更多
BACKGROUND: Ultraviolet blood irradiation and oxygenation (UBIO) has obtained better clinical effect in treating acute cerebral infarction, but the mechanism underlying this effect remains unclear. OBJECTIVE: To o...BACKGROUND: Ultraviolet blood irradiation and oxygenation (UBIO) has obtained better clinical effect in treating acute cerebral infarction, but the mechanism underlying this effect remains unclear. OBJECTIVE: To observe the effect of UBIO on the nerve function and activities of K^+-Na^+-ATPase and Ca2^+-Mg2^+-ATPase activities on the red blood cell (RBC) membrane of patients with acute cerebral infarction. DESIGN: A randomized and controlled study.SETTING: Department of Neurology, Xiangfan Central Hospital.PARTICIPANTS: From January 2000 to December 2001, excluding those above 70 years old, 58 cases of 700 patients with acute cerebral infarction admitted in the Department of Neurology, Xiangfan Central Hospital, were recruited and divided into two groups according to the random number table: UBIO treated group (n=28), including 17 males and 11 females, aged 40-68 years; and control group (n=30), including 20 males and 10 females, aged 44-69 years. All the patients agreed to participate in the therapeutic program and detected items. The general informations were comparable without obvious differences between the two groups (P 〉 0.05).METHODS: ① The patients in both groups received routine treatments, besides, those in the UBIO treated group were given UBIO treatment by using the XL-200 type therapeutic apparatus produced in Shijiazhuang, whose ultraviolet wave was set at 253.7 nm with the energy density of 0.568 J/m^2 per second, UBIO treatment started from the second day after admission, once every other day, with a single course consisting of 5-7 treatments. ② In the UBIO treated group, the venous blood was sampled before and after the first, third and the completion of the treatment course respectively, the venous blood was taken at each corresponding time point in the control group. After centrifugation of the blood at 10 000 rounds per minute, the RBC membrane was separated and then the activities of K^+-Na^+-ATPase and Ca2^+-Mg2^+-ATPase were detected by means of phosphorus determination.③ The nerve function was scored before and after treatment in both groups with European stroke scale, which included 13 items, the total score was 0-100 points, the higher the score, the better the nerve function. MAIN OUTCOME MEASURES :①Score of European stroke scale before and after treatment in both groups.② Comparison of the activities of K^+-Na^+-ATPase and Ca2^+-Mg2^+-ATPase on RBC membrane between the two groups before treatment and after the first, third and the completion of the treatment. RESULTS: All the 58 patients with cerebral infarction were involved in the analysis of results.① The score of European stroke scale had no obvious difference between the two groups [(49.31±11.48), (50.58±12.63), P 〉 0.05], and it was obviously higher in the UBIO treated group than in the control group after treatment [84.66±13.75), (77.05±11.17), P 〈 0.05].②The activity of K^+-Na^+-ATPase on RBC membrane in the UBIO treated group was significantly increased after the first and third treatment as compared with before treatment [(31.56±19.25), (27.64±15.83), (17.67±13.83), P 〈 0.01], it was still higher after the completion of the treatment than before treatment without obvious difference [(20.86±14.53), P 〉 0.05]. After the first and third treatment, it was obviously higher in the UBIO treated group than in the control group [19.31±11.88), (17.44±10.42), P 〈 0.01]. ③ In the UBIO treated group, Ca2^+-Mg2^+-ATPase activity on RBC membrane significantly increased after the first treatment and remained higher than the pre-treatment level throughout the treatment [(27.49±14.72), (17.41±4.82), P 〈 0.01]. The activity of Ca2^+-Mg2^+-ATPase on RBC membrane was markedly higher in the UBIO treated group than in the control group after after the first, third and the completion of treatment respectively [(24.83±12.88), (17.70±5.69); (28.08±13.44), (16.32±5.29); (17.42±6.04), P〈 0.05-0.01]. CONCLUSION: The effect of UBIO treatment against acute cerebral infarction may be mediated by the increased K^+-Na^+ ATPase and Ca2^+-Mg2^+-ATPase activities on RBC membrane, which enhances the RBC transformation ability so as to lower RBC aggregation and correct high blood viscosity.展开更多
The changes of blood perfusion and oxygen transport in tumors during tumor vascular normalization are studied with 3-dimensional mathematical modeling and numerical simulation. The models of tumor angiogenesis and vas...The changes of blood perfusion and oxygen transport in tumors during tumor vascular normalization are studied with 3-dimensional mathematical modeling and numerical simulation. The models of tumor angiogenesis and vascular-disrupting are used to simulate "un-normalized" and "normalized" vasculatures. A new model combining tumor hemodynamics and oxygen transport is developed. In this model, the intravasculartransvascular-interstitial flow with red blood cell(RBC) delivery is tightly coupled, and the oxygen resource is produced by heterogeneous distribution of hematocrit from the flow simulation. The results show that both tumor blood perfusion and hematocrit in the vessels increase, and the hypoxia microenvironment in the tumor center is greatly improved during vascular normalization. The total oxygen content inside the tumor tissue increases by about 67%, 51%, and 95% for the three approaches of vascular normalization,respectively. The elevation of oxygen concentration in tumors can improve its metabolic environment, and consequently reduce malignancy of tumor cells. It can also enhance radiation and chemotherapeutics to tumors.展开更多
目的通过比较西藏自治区阿里地区人民医院与陕西省两所医院健康新生儿出生后血氧饱和度(SpO_(2))水平和血常规水平,探索西藏自治区阿里地区新生儿出生后SpO_(2)水平与红细胞形态、功能的特点。方法本研究为盲法回顾性研究。选取阿里地...目的通过比较西藏自治区阿里地区人民医院与陕西省两所医院健康新生儿出生后血氧饱和度(SpO_(2))水平和血常规水平,探索西藏自治区阿里地区新生儿出生后SpO_(2)水平与红细胞形态、功能的特点。方法本研究为盲法回顾性研究。选取阿里地区人民医院、泾阳县人民医院和耀州区人民医院新生儿科2020年1月至2020年7月正常出生的167例足月新生儿,阿里地区人民医院出生新生儿(74例)为高原组,陕西省两所医院出生新生儿(93例)为平原组。监测正常足月新生儿断脐后10 min右上肢SpO_(2)及心率水平,同时采集废弃脐血进行血细胞分析。比较高原组与平原组足月正常新生儿出生后10 min SpO_(2)水平特点,与《新生儿复苏指南(2021年)》(后文统一简称《指南》)中SpO_(2)目标值进行比较,同时比较两组血细胞分析结果的差异。结果高原组出生新生儿出生1~10 min SpO_(2)水平低于平原组,差异有统计学意义(P<0.05)。高原组出生新生儿脐血白细胞计数、血小板计数低于平原组,差异有统计学意义(P<0.05);红细胞计数、血红蛋白高于平原组,差异有统计学意义(P<0.05);红细胞平均体积小于平原组,差异有统计学意义(P<0.05),平均血红蛋白量、平均血红蛋白浓度、红细胞分布宽度标准偏差及红细胞分布宽度变异系数高于平原组,差异有统计学意义(P<0.05)。高原组出生新生儿1~8 min SpO_(2)水平与《指南》目标值符合率明显低于平原组,差异有统计学意义(P<0.05)。高原组出生新生儿出生后第9 min、出生后第10 min,SpO_(2)水平与《指南》目标值符合率为100%,与平原组比较差异无统计学意义(P>0.05)。结论《指南》中出生后10 min SpO_(2)预期值适用于西藏自治区阿里地区新生儿,脐血红细胞特有形态及高血红蛋白含量和浓度可能是常驻藏族新生儿适应高原的原因之一。展开更多
文摘Desiccating human red blood cells (RBCs) to increase their storage life has been the subject of intense research for a number of years. However, drying RBCs invariably compromises their integrity and has detrimental effects on hemoglobin function due to autoxidation. We have previously demonstrated an RBC desiccation and rehydration process that preserves RBC antigenic epitopes better than frozen RBCs. This study expands on those observations by examining what effects this desiccation process has on RBC hemoglobin function with respect to oxygen binding properties. In this paper, we examined RBCs from normal donors which were desiccated to 25% moisture content and stored dry for 2 weeks at room temperature prior to rehydration with plasma followed by structural and functional studies. Our data showed that approximately 98% of the RBCs were intact upon rehydration based on hemolysis assays. Oxygen dissociation curves for the desiccated/rehydrated RBCs showed a left shift compared to fresh RBCs (pO2 = 17 mmHg vs. 26 mmHg, respectively). The desiccated/rehydrated RBCs also showed an increase in methemoglobin compared to fresh RBCs (4.5% vs 0.9%, respectively). 2,3-Diphosphoglycerate concentration of the desiccated/rehydrated RBCs was reduced by 20%. In conclusion, although this RBC dehydration process preserves RBC integrity and hemoglobin oxygen binding properties better than most other dehydration techniques described so far, further optimization and long-term studies are needed to make this procedure acceptable for human transfusion.
文摘BACKGROUND: Ultraviolet blood irradiation and oxygenation (UBIO) has obtained better clinical effect in treating acute cerebral infarction, but the mechanism underlying this effect remains unclear. OBJECTIVE: To observe the effect of UBIO on the nerve function and activities of K^+-Na^+-ATPase and Ca2^+-Mg2^+-ATPase activities on the red blood cell (RBC) membrane of patients with acute cerebral infarction. DESIGN: A randomized and controlled study.SETTING: Department of Neurology, Xiangfan Central Hospital.PARTICIPANTS: From January 2000 to December 2001, excluding those above 70 years old, 58 cases of 700 patients with acute cerebral infarction admitted in the Department of Neurology, Xiangfan Central Hospital, were recruited and divided into two groups according to the random number table: UBIO treated group (n=28), including 17 males and 11 females, aged 40-68 years; and control group (n=30), including 20 males and 10 females, aged 44-69 years. All the patients agreed to participate in the therapeutic program and detected items. The general informations were comparable without obvious differences between the two groups (P 〉 0.05).METHODS: ① The patients in both groups received routine treatments, besides, those in the UBIO treated group were given UBIO treatment by using the XL-200 type therapeutic apparatus produced in Shijiazhuang, whose ultraviolet wave was set at 253.7 nm with the energy density of 0.568 J/m^2 per second, UBIO treatment started from the second day after admission, once every other day, with a single course consisting of 5-7 treatments. ② In the UBIO treated group, the venous blood was sampled before and after the first, third and the completion of the treatment course respectively, the venous blood was taken at each corresponding time point in the control group. After centrifugation of the blood at 10 000 rounds per minute, the RBC membrane was separated and then the activities of K^+-Na^+-ATPase and Ca2^+-Mg2^+-ATPase were detected by means of phosphorus determination.③ The nerve function was scored before and after treatment in both groups with European stroke scale, which included 13 items, the total score was 0-100 points, the higher the score, the better the nerve function. MAIN OUTCOME MEASURES :①Score of European stroke scale before and after treatment in both groups.② Comparison of the activities of K^+-Na^+-ATPase and Ca2^+-Mg2^+-ATPase on RBC membrane between the two groups before treatment and after the first, third and the completion of the treatment. RESULTS: All the 58 patients with cerebral infarction were involved in the analysis of results.① The score of European stroke scale had no obvious difference between the two groups [(49.31±11.48), (50.58±12.63), P 〉 0.05], and it was obviously higher in the UBIO treated group than in the control group after treatment [84.66±13.75), (77.05±11.17), P 〈 0.05].②The activity of K^+-Na^+-ATPase on RBC membrane in the UBIO treated group was significantly increased after the first and third treatment as compared with before treatment [(31.56±19.25), (27.64±15.83), (17.67±13.83), P 〈 0.01], it was still higher after the completion of the treatment than before treatment without obvious difference [(20.86±14.53), P 〉 0.05]. After the first and third treatment, it was obviously higher in the UBIO treated group than in the control group [19.31±11.88), (17.44±10.42), P 〈 0.01]. ③ In the UBIO treated group, Ca2^+-Mg2^+-ATPase activity on RBC membrane significantly increased after the first treatment and remained higher than the pre-treatment level throughout the treatment [(27.49±14.72), (17.41±4.82), P 〈 0.01]. The activity of Ca2^+-Mg2^+-ATPase on RBC membrane was markedly higher in the UBIO treated group than in the control group after after the first, third and the completion of treatment respectively [(24.83±12.88), (17.70±5.69); (28.08±13.44), (16.32±5.29); (17.42±6.04), P〈 0.05-0.01]. CONCLUSION: The effect of UBIO treatment against acute cerebral infarction may be mediated by the increased K^+-Na^+ ATPase and Ca2^+-Mg2^+-ATPase activities on RBC membrane, which enhances the RBC transformation ability so as to lower RBC aggregation and correct high blood viscosity.
基金Project supported by the National Natural Science Foundation of China(Nos.11102113 and81301816)the New Teachers Start Program of Shanghai Jiao Tong University+1 种基金the Chenxing Young Scholars Program B of Shanghai Jiao Tong University(No.13X100010070)the Natural Science Research Foundation of Shanghai Jiao Tong University School of Medicine(No.13XJ10037)
文摘The changes of blood perfusion and oxygen transport in tumors during tumor vascular normalization are studied with 3-dimensional mathematical modeling and numerical simulation. The models of tumor angiogenesis and vascular-disrupting are used to simulate "un-normalized" and "normalized" vasculatures. A new model combining tumor hemodynamics and oxygen transport is developed. In this model, the intravasculartransvascular-interstitial flow with red blood cell(RBC) delivery is tightly coupled, and the oxygen resource is produced by heterogeneous distribution of hematocrit from the flow simulation. The results show that both tumor blood perfusion and hematocrit in the vessels increase, and the hypoxia microenvironment in the tumor center is greatly improved during vascular normalization. The total oxygen content inside the tumor tissue increases by about 67%, 51%, and 95% for the three approaches of vascular normalization,respectively. The elevation of oxygen concentration in tumors can improve its metabolic environment, and consequently reduce malignancy of tumor cells. It can also enhance radiation and chemotherapeutics to tumors.
文摘目的通过比较西藏自治区阿里地区人民医院与陕西省两所医院健康新生儿出生后血氧饱和度(SpO_(2))水平和血常规水平,探索西藏自治区阿里地区新生儿出生后SpO_(2)水平与红细胞形态、功能的特点。方法本研究为盲法回顾性研究。选取阿里地区人民医院、泾阳县人民医院和耀州区人民医院新生儿科2020年1月至2020年7月正常出生的167例足月新生儿,阿里地区人民医院出生新生儿(74例)为高原组,陕西省两所医院出生新生儿(93例)为平原组。监测正常足月新生儿断脐后10 min右上肢SpO_(2)及心率水平,同时采集废弃脐血进行血细胞分析。比较高原组与平原组足月正常新生儿出生后10 min SpO_(2)水平特点,与《新生儿复苏指南(2021年)》(后文统一简称《指南》)中SpO_(2)目标值进行比较,同时比较两组血细胞分析结果的差异。结果高原组出生新生儿出生1~10 min SpO_(2)水平低于平原组,差异有统计学意义(P<0.05)。高原组出生新生儿脐血白细胞计数、血小板计数低于平原组,差异有统计学意义(P<0.05);红细胞计数、血红蛋白高于平原组,差异有统计学意义(P<0.05);红细胞平均体积小于平原组,差异有统计学意义(P<0.05),平均血红蛋白量、平均血红蛋白浓度、红细胞分布宽度标准偏差及红细胞分布宽度变异系数高于平原组,差异有统计学意义(P<0.05)。高原组出生新生儿1~8 min SpO_(2)水平与《指南》目标值符合率明显低于平原组,差异有统计学意义(P<0.05)。高原组出生新生儿出生后第9 min、出生后第10 min,SpO_(2)水平与《指南》目标值符合率为100%,与平原组比较差异无统计学意义(P>0.05)。结论《指南》中出生后10 min SpO_(2)预期值适用于西藏自治区阿里地区新生儿,脐血红细胞特有形态及高血红蛋白含量和浓度可能是常驻藏族新生儿适应高原的原因之一。