EXPRESSION OF IL-2R ON PERIPHERAL BLOOD LYMPHOCYTES OF PATIENTS WITH COLORECTAL CANCER AND ITS CLINICAL SIGNIFICANCE

Objective: To study expression of membrane receptors of interleukin-2 (CD25) on the peripheral blood lymphocytes (PBL) of patients with colorectal cancer and its clinical significance. Methods: CD25 percentages (CD25%) in PBL of 105 colorectal cancer patients before operation and 100 normal individuals were examined by flow cytometer, and the results were clinically and pathologically analyzed. Results: The mean of CD25% in PBL of the normal individuals was 17.24±5.33, it was significantly lower (P<0.01) than that of the colon cancer patients (21.29±7.95) or rectal cancer patients (21.62±6.11). In contrast to the normal individuals, the means of CD25% in PBL in ulcer type (20.53±6.50) or protruded type (21.56±6.16) colorectal cancer patients were notably elevated (P<0.01). The significant difference (P<0.01) of means of CD25% in PBL was observed between the normal individuals and patients with less than 4 cm mass (22.10±5.43) or 4cm–8cm mass (20.90±6.96). The significant difference (P<0.05) of means of CD25% in PBL was also observed between the normal individuals and patients with greater than 8 cm mass (21.56±5.41). The mean of CD25% in PBL in patients with well differentiation colorectal cancer was 22.20±5.50, it was significantly higher than that in normal individuals (P<0.05). The means of CD25% in PBL in patients with middle or poor differentiation colorectal cancer were 21.30±6.89 and 22.15±5.71 respectively, they were obviously higher than that in normal individuals (P<0.01). The significant difference (P<0.01) of means of CD25% in PBL was present between the colorectal cancer patients without metastatic lymph nodes (22.06±6.90) and normal individuals. The significant difference (P<0.05) of means of CD25% in PBL was present between the colorectal cancer patients with metastatic lymph nodes (20.73±6.40) and normal individuals. The means of CD25% in PBL in colorectal cancer patients in various clinic stages were significantly higher than that in the health subjects (P<0.01). The significant difference (P<0.01) of means of CD25% in PBL was present between the patients whose ages were equal to or less than 60 (21.00±5.76) and normal individuals in the same age group. The significant difference (P<0.05) of means of CD25% in PBL was also present between the patients whose ages were greater than 60 (22.54±7.75) and normal individuals in the same age group. The significant difference (P<0.01) of means of CD25% in PBL was present between the male patients (22.55±7.05) and normal men. The significant difference (P<0.05) of means of CD25% in PBL was also present between the female patients (20.09±5.48) and normal women. Conclusion: The mean of CD25% in PBL of colorectal cancer patients was significantly higher than that in health subjects. Abnormally elevated CD25% were correlative with site of tumor growth, macropathology type of tumor, the degree of tumor differentiation, clinical stage and patient’s age and sex. It may be helpful to detect CD25% in PBL of colorectal cancer patients before operation for diagnosis, immune treatment and judging prognosis.

Comparison of blood rheological models in patient specific cardiovascular system simulations

Newtonian, Quemada and Casson blood viscosity models are implemented in order to simulate the rheological behavior of blood under pulsating flow conditions in a patient specific iliac bifurcation. The influence of the applied blood constitutive equations is monitored via the wall shear stress （WSS） distribution, magnitude and oscillations, non-Newtonian importance factors, and viscosity values according to the shear rate. The distribution of WSS on the vascular wall follows a pattern which is independent of the theological model chosen. On the other hand, the WSS magnitude and oscillations are directly related to the blood constitutive equations applied and the shear rate. It is concluded that the Newtonian approximation is satisfactory only in high shear and flow rates. Moreover, the Newtonian model seems to overestimate the possibility for the formation of atherosclerotic lesions or aneurysms at sites of the vascular wall where the WSS are oscillating.

脓毒症大鼠血清乳酸、乳酸清除率及转氨酶水平与肝脏损伤关系的探讨

【摘要】目的探讨脓毒症大鼠血清乳酸水平、乳酸清除率及转氨酶水平与肝脏病理变化的关系，并研究乳酸水平、乳酸清除率与转氨酶水平是否存在相关性，评价是否能够作为预测评价脓毒症大鼠肝脏损伤指标。方法将清洁级SD大鼠150只分为正常组50只，假手术组50只，盲肠结扎术（CLP）手术组50只。CLP组于手术成功后的第6、12、24、48及72小时分别取10只处死，并于每个时间点取10只正常组大鼠和10只假手术组大鼠作为相应时间点的对照。在各时间点取肝脏组织进行病理学分析，测定乳酸水平及转氨酶水平，计算乳酸清除率。比较各时间点乳酸水平、转氨酶水平是否存在差异，并分析乳酸、乳酸清除率与转氨酶的相关性。结果CLP组大鼠肝细胞6h组开始出现损伤，12、24和48h损伤逐渐加重，损伤在CLP后48h最重；CLP组12、24h乳酸、谷丙转氨酶（ALT）水平明显增高，与正常组和假手术组相比差异均具有统计学意义（P〈0．05）；CLP组6、12、24、48、72h谷草转氨酶（AST）水平明显高于正常组及假手术组（P〈0．05）。乳酸与ALT水平呈正相关（r：0．766，P〈0．05），乳酸清除率与ALT水平呈负相关（r=-0．712，P〈0．05）。结论在脓毒症中，大鼠乳酸水平与乳酸清除率都同谷丙转氨酶水平存在相关性；三者与肝脏病理损伤时间基本相同；乳酸清除率及乳酸均能反应脓毒症大鼠肝脏损伤。