Recovery of T cell subsets after autologous bone marrow transplantation is mainly due to proliferation of mature T cells in the graft

In 22 patients with malignancies, treated with high-dose chemoradiotherapy and autologous bone marrow transplantation (BMT), peripheral blood T cell subsets and functions were studied. In ten cytomegalovirus (CMV)-negative patients, CD4+ and CD8+ T cells (representing T cells of the helper/inducer phenotype and T cells of the suppressor/cytotoxic phenotype, respectively), recovered slowly and simultaneously. In 12 CMV-positive patients, however, CD8+ T cells recovered more rapidly than CD4+ T cells and rose to increased counts. No T cells with an immature phenotype (CD1+, OKT6+) were observed. Lymphocyte stimulation by herpes simplex virus infected fibroblasts (and by CMV-infected fibroblasts in CMV-positive patients) in contrast remained high and even increased after BMT in both groups. These data indicate that T cell recovery after autologous BMT is mainly due to proliferation of mature T cells present in the BM graft and not to generation of new T cells from T cell precursors.     

The presence of clonogenic cells in high-grade malignant lymphoma: a prognostic factor

A culture system has been developed that promotes growth of clonogenic lymphoma cells of some patients with intermediate and high-grade malignant lymphoma. The formation of colonies in bone marrow, lymph nodes, and peripheral blood samples is best supported by human plasma. Colony formation of some patients was dependent upon growth factors, which in this study were added in the form of medium conditioned by phytohemagglutinin (PHA)-stimulated leukocytes (PHA-LCM). Some gave rise to lymphoma colonies without PHA-LCM but improved their frequency with PHA-LCM; others were completely independent of PHA-LCM. Colonies grown in primary cultures were routinely recloned and propagated as Epstein-Barr virus (EBV)-negative cell lines with stable B cell phenotype. The cell lines showed the same immunoglobulin rearrangement pattern as that observed in the primary lymphoma sample. In addition, a significant clinical correlation was observed between culture data and clinical outcome. Survival of patients who formed lymphoma colonies at any time during their clinical course was significantly shorter than survival of patients who did not give rise to colonies (P = 0.0009). The same observation was made when the survival assessment was performed for the subset of patients studied at diagnosis (P = 0.0014).     

Depression and depressive symptoms in rheumatoid arthritis patients: an analysis of their occurrence and determinants

The objectives were to determine the differences in depressive symptoms and depression between rheumatoid arthritis (RA) and osteoarthritis (OA) patients, and to analyse the contribution of sociodemographic and clinical variables to depression in RA patients. The responses of 60 Egyptian RA patients and 40 patients with OA of the knees to the Symptom Checklist-90-R Depression subscale were compared. The proportions of patients from both groups confirmed by a psychiatric interview to be clinically depressed according to the DSM-III-R criteria were also compared. The contributions of sociodemographic and disease variables to depressive symptoms and clinical depression in RA patients were explored by multiple linear and logistic regression, respectively. RA patients showed significantly higher depression scores than OA patients (P = 0.001). The difference was unaffected by controlling for the effects of age, sex, disease duration and the sociodemographic covariates. A depressive disorder was clinically confirmed in 23% of RA patients and 10% of OA patients. The erythrocyte sedimentation rate (ESR), being unmarried and an urban residence were significant predictors of depressive symptoms (P < 0.05), while being unmarried (P < 0.05, OR = 2.1) and HAQ disability (P < 0.01, OR = 3.8) were significant predictors of clinical depression in RA patients. RA patients have significantly more depressive symptoms and tend to be more clinically depressed than OA patients. The contribution of some sociodemographic and clinical variables to depression in RA patients was modest, albeit significant.      

FRAX在中国绝经后女性人群骨折风险预测中的适用性评价

目的评价世界卫生组织发布的骨折风险预测工具(FRAX)对中国绝经后女性人群的适用性,探索有、无股骨颈骨密度(BMD)对FRAX预测结果的影响。方法对2314名绝经后中国女性进行回顾性队列分析。采集所有入选者FRAX预测工具中所包含的各危险因素资料,将包括股骨颈BMDT值等数据输入FRAX,计算10年骨折风险。从所有危险因素数据中得出针对中国绝经后女性骨折风险预测的回归方程,将该方程得出的骨折风险值与FRAX预测值相比较。对有无BMD情况下的FRAX预测值进行比较。结果除吸烟和饮酒外,FRAX预测风险与各危险因素间均具有统计学意义,既往骨折史是最重要的危险因素。骨质疏松引起的主要骨折概率(临床性椎体、髋部、肱骨和前臂骨折)和髋部骨折的概率均随着股骨颈BMD的下降而升高。根据中国绝经后女性骨折风险预测回归方程计算的髋部骨折风险概率与FRAX预测结果一致,有无BMD情况下的FRAX预测结果差异无统计学意义。结论 FRAX可用于中国绝经后女性人群骨折风险预测,无BMD情况下的FRAX预测结果同样可靠。     

青春期多囊卵巢综合征不同临床亚型脂代谢的比较性分析

目的:比较青春期PCOS不同临床亚型的脂代谢异常,筛选出青春期PCOS易患心血管疾病的预测指标。方法:选取青春期PCOS患者92例及56例某高中女生作为对照组,测定人体测量学参数(体重指数、腰臀比)及脂代谢相关指标。将青春期PCOS患者分为3个亚型:Ⅰ型(完全满足鹿特丹3个标准):月经稀发或闭经、严重多毛、高雄激素血症和卵巢多囊样改变,Ⅱ型:月经稀发或闭经和高雄激素血症或严重多毛;Ⅲ型:月经稀发或闭经和卵巢多囊样改变,测定人体测量学参数及脂代谢相关指标。结果:PCOS组BMI、WHR、TG、LDL、LDL/HDL、APoB/APoA1高于对照组(P<0.05或P<0.01)。PCOSⅠ型WHR、TG、Chol、LDL、LDL/HDL、APoB、APoB/APoA1高于Ⅲ型(P<0.05),Ⅱ型LDL高于Ⅲ型(P<0.05)。结论:青春期PCOSⅠ型患者具有更严重的脂代谢紊乱,测定LDL/HDL和APoB/APoA1可能对早期发现脂代谢异常有重要价值。     

Neovascularization Capacity of Mesenchymal Stromal Cells From Critical Limb Ischemia Patients Is Equivalent to Healthy Controls

Critical limb ischemia (CLI) is often poorly treatable by conventional management and alternatives such as autologous cell therapy are increasingly investigated. Whereas previous studies showed a substantial impairment of neovascularization capacity in primary bone-marrow (BM) isolates from patients, little is known about dysfunction in patient-derived BM mesenchymal stromal cells (MSCs). In this study, we have compared CLI-MSCs to healthy controls using gene expression profiling and functional assays for differentiation, senescence and in vitro and in vivo pro-angiogenic ability. Whereas no differentially expressed genes were found and adipogenic and osteogenic differentiation did not significantly differ between groups, chondrogenic differentiation was impaired in CLI-MSCs, potentially as a consequence of increased senescence. Migration experiments showed no differences in growth factor sensitivity and secretion between CLI- and control MSCs. In a murine hind-limb ischemia model, recovery of perfusion was enhanced in MSC-treated mice compared to vehicle controls (71 ± 24% versus 44 ± 11%; P < 1 × 10⁻⁶). CLI-MSC- and control-MSC–treated animals showed nearly identical amounts of reperfusion (ratio CLI:Control = 0.98, 95% CI = 0.82–1.14), meeting our criteria for statistical equivalence. The neovascularization capacity of MSCs derived from CLI-patients is not compromised and equivalent to that of control MSCs, suggesting that autologous MSCs are suitable for cell therapy in CLI patients.     

Study on Support Vector Machine model for determination of quasi-geoid

支持向量机(SVM)是一种基于结构风险最小化原理的学习技术,也是一种新的具有较好泛化性能的回归方法.本文简要介绍了SVM原理,针对大面积复杂似大地水准面的确定问题,仅依据测区的GPS水准实测数据,利用SVM方法整体建模.通过工程实例并与神经网络模型进行对比,证实了SVM似大地水准面模型的可靠性.