催产素对妊娠末期大鼠蜕膜细胞内游离钙的刺激作用

妊娠末期催产素刺激子宫蜕膜细胞产生与分娩有关的前列腺素,但其作用方式仍未知。本实验分离妊娠19d大鼠蜕膜细胞,测定了催产素作用后蜕膜细胞内游离钙的变化,结果加入0.001～1μmol·L^-1催产素后,蜕膜细胞内[Ca²⁺]i出现瞬息增加,其峰值与催产素浓度呈剂量依赖关系,且此作用有自身钝化现象。说明催产素可能激活妊娠末期大鼠蜕膜细胞内的肌醇磷酯蛋白激酶C系统。给妊娠末期大鼠ip硫酸去氢表雄酮钠盐后分离的蜕膜细胞,催产素作用引起[Ca²⁺]i瞬息增加峰值较对照升高。     

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.     

Interventional management of critical limb ischemia in renal patients

Critical limb ischemia (CLI) represents the most severe clinical manifestation of peripheral arterial disease (PAD), defined as the presence of chronic ischemic rest pain, ulcers, or gangrene attributable to objectively proven arterial occlusive disease. The occurrence of CLI in patients with kidney insufficiency portends a strikingly high rate of subsequent morbidity and mortality. Generally, the primary therapy for CLI is revascularization of the affected limb. However, patients with CLI and kidney insufficiency represent a unique and challenging patient subset, and data from surgical series suggest reduced rates of limb salvage and higher medium and long-term mortality rates for patients with kidney insufficiency compared with those with normal kidney function. In contemporary practice, endovascular techniques are fast replacing surgical bypass as the first-line revascularization strategy for CLI, based on high technical success rates and low rates of procedure-related morbidity and mortality. However, a large series on endovascular outcomes for the treatment of CLI in patients with kidney insufficiency is lacking. Based on the severely reduced long-term survival rates of patients with CLI and kidney insufficiency, future efforts should focus on early detection of PAD in patients with kidney insufficiency and institution of aggressive medical therapy to prevent progression in the global burden of atherosclerosis in this patient population.     

Chlorambucil therapy in hairy cell leukemia: effects on lipid composition and lymphocyte subpopulations

Two patients with progressive hairy cell leukemia following splenectomy were treated with low-dose daily chlorambucil. Both had an objective hematologic response as determined by a return to normal hematocrit and platelet count. This was also reflected in the mononuclear cell fraction by the normalization of cholesterol content, cholesterol/phospholipid ratio, and the lymphocyte subpopulations. This article confirms previous reports on the efficacy of chlorambucil in this setting and describes some morphological, and biochemical concomitant events.     

MR imaging of facial nerve enhancement in Bell palsy or after temporal bone surgery

The authors evaluated magnetic resonance (MR) images obtained with intravenously administered gadolinium in ten patients who had facial paralysis and no facial nerve tumor. In patients with either Bell palsy (four patients) or facial paralysis after temporal bone surgery (six patients), intratemporal facial nerve enhancement was seen. Facial nerve enhancement on MR images proved to be a nonspecific finding.     

Aortocoronary dissection complicating a percutaneous coronary intervention

Aortocoronary dissection complicating diagnostic angiography or percutaneous coronary intervention is a rare occurrence. We present a case of aortocoronary dissection complicating a right coronary artery intervention. After closing the entry port with intracoronary stenting, the patient was managed conservatively. Serial computed tomography scans demonstrated spontaneous resolution of the dissection.