Wortmannin-mediated inhibition of phosphatidylinositol 3-kinase activity triggers apoptosis in normal and neoplastic B lymphocytes which are in cell cycle

The B cell functional response following ligation of surface(s) lgM is dependent upon the differentiation stage of the populationstudied: cross-linking slgM promotes proliferation of restingtonsillar follicular mantle (FM) B lymphocytes but induces apoptosisin the susceptible Epstein- Barr virus genome-negative Burkittlymphoma (BL) cell line Ramos (Ramos-BL). This study investigateswhether phosphatidylinositol-3-kinase (Pl3-kinase), which hasbeen reported to be intimately involved in the regulation ofcellular growth, plays a role in the regulation of these sig-promoted B cell responses, and uses the selective and irreversibleinhibitor of Pl3-kinase activity, wortmannin (Wm). In Ramos-BLB cells, at 8 h post-treatment, Wm triggers a transient increasein apoptosis of 16 ± 6.9% with a concomitant cellularloss of 16 ± 6.1% from the G₁ phase of cell cycle; [³H]thymidineincorporation also decreases by 33 ± 5.0%, from 37,274c.p.m. ± 10% to 25,127 c.p.m. ± 4.0%. Moreover,at 72 h culture, Wm inhibits anti-lgM-induced FM B lymphocytelevels of [³H]thymidine incorporation typically by 47% and triggers80% apoptosis from the G₀G₁ phase of cell cycle. Ramos-BL Bcells exhibit high basal levels of Pl3-kinase activity, as determinedby immunoprecipitation with antibody to the p85 regulatory subunitof Pl3-kinase and ³²P incorporation into phosphatidylinositol,which is not significantly affected by anti-lgM stimulation;by contrast, anti-lgM stimulates significant Pl3-kinase activityover negligible basal levels in FM B lymphocytes. Pre-treatmentwith Wm inhibits Pl3-kinase activity in both cell types. Takentogether these data indicate that in Ramos-BL B cells slgM-triggeredgrowth arrest and apoptosis is Pl3- kinase independent, whereasPl3-kinase activity is critical for slgM-triggered mitogenesisof FM B lymphocytes. Thus Pl3-kinase plays a pivotal role inthe regulation of both normal and neoplastic B lymphocyte progressionthrough the cell cycle, such that if this Pl3-kinase-dependentpathway is inhibited these cells default to apoptosis.     

A case of cystadenocarcinoma of the liver

A case of cystadenocarcinoma of the liver is reported. The patient was a 73-year-old woman in whom a tumor was detected in the lateral segment of the liver during a health examination. Ultrasonograms and computed tomograms showed a multilocular cystic mass. Magnetic resonance imaging (MRI) showed a multilocular lowintensity mass, including a high-intensity portion and a portal branch compressed by the tumor. MRI with gadolinium showed an enhanced cyst wall. The cystic part of the tumor became smaller and the solid part became larger over a 1-month period, indicating that the tumor was malignant. Subsegmentectomy (S₃) was performed and cystadenocarcinoma with cystadenoma was diagnosed by histopathological examination. Identification of changes in the appearance of a tumor should be helpful for the differential diagnosis of cystadenoma and cystadenocarcinoma.     

nm23-H1基因转染对人胆管癌细胞系QBC939体外浸润能力的影响

目的：探讨nm23-H1基因转染对人胆管癌细胞系QBC939体外浸润能力的影响。方法：将含有全长nm23-H1 cDNA的真核表达载体通过脂腩体法转染人胆管癌细胞系。结果：转染成功的QBC939细胞，其nm23-Hl基因的mRNA、蛋白表达明显增加，转染nm23-H1基因的胆管癌细胞体外浸润能力下降，穿越matrigel的细胞数明显低于亲本QBC939细胞，代表浸润能力的IV型胶原酶（MMP-9）分泌量下降。结论：nm23-Hl基因可以抑制胆管癌细胞的体外浸润能力。     

Angiodysplasia as the cause of massive lower gastrointestinal hemorrhage in a young adult

PURPOSE: This study was undertaken to clarify the importance of bleeding vascular ectasia of the colon as the etiology of massive lower gastrointestinal hemorrhage in patients 40 years of age or younger. METHODS: An otherwise healthy 21-year-old male was admitted to a tertiary medical center with massive lower gastrointestinal hemorrhage. Technetium-labeled red blood cell scan, selective visceral angiography, and colonoscopy identified the source of bleeding as vascular abnormality of the descending colon. Segmental colonic resection was performed. RESULTS: Histologic review of the specimen demonstrated a vascular ectasia. The patient recovered uneventfully and has had no further stigmata of hemorrhage. A review of the literature was undertaken to make clear the significance of vascular ectasia as the source for massive colonic hemorrhage in the young adult. CONCLUSION: This is the first report that documents histologically a vascular ectasia as the source of massive lower gastrointestinal hemorrhage in an otherwise healthy patient less than 40 years of age. Vascular ectasia is an uncommon cause of lower gastrointestinal hemorrhage in the young adult.The Chief, Bureau of Medicine and Surgery, Navy Department, Washington, DC, Clinical Investigation Program sponsored this report #84-16-1968-532, as required by HSETCINST 6000.41A. The views expressed in this article are those of the authors and do not reflect the official policy or position of the Department of the Navy, Department of Defense, or the United States Government.     

Clinical Studies on Functional Dyspepsia Treated with Different Dosage-Form of Zhishi Xiaopi Pill Recipe (枳实消痞丸方)

Ｄｙｓｐｅｐｓｉａｒｅｆｅｒｓｔｏｐａｉｎｏｒｄｉｓｃｏｍｆｏｒｔｆｏ ｃｕｓｅｄｉｎｔｈｅｅｐｉｇａｓｔｒｉｕｍ，ｗｈｉｃｈｗａｓｒｅｐｏｒｔｅｄｔｏｏｃｃｕｒｉｎｍｏｒｅｔｈａｎ 1 0 %ｏｆｏｕｔｐａｔｉｅｎｔｓｉｎｉｎｔｅｒｎａｌｍｅｄｉｃｉｎｅ，ａｎｄｎｅａｒｌｙｈａｌｆｔｈｅｐａｔｉｅｎｔｓｉｎｔｈｅｇａｓ ｔｒｏｉｎｔｅｓｔｉｎａｌ（ＧＩ）ｄｅｐａｒｔｍｅｎｔ（1）．Ａｌｍｏｓｔｈａｌｆｏｆｔｈｅｓｅｐａｔｉｅｎｔｓｗｉｔｈｄｙｓｐｅｐｓｉａｗｈｏｈａｖｅｎｏｄｅｆｉ ｎｉｔｅｏｒｇａｎｉ…     

Management of pediatric pontine gliomas

We present 36 consecutive patients with intrinsic glioma of the pons. Tumors with exophytic expansion were excluded. There were 16 females and 20 males, ranging in age from 2 to 13 years, median 6 years. The most common presenting symptoms were cranial nerve dysfunction. unsteadiness of gait, and hemiparesis. Computed tomography (CT) showed a hypodense (17/21) or isodense (4/21) expansion of the pons. Five tumors had areas of contrast enhancement. Following information about prognosis and possible types of management, parents decided for or against radiation therapy: twentyfour children underwent irradiation and 12 did not. Median survival among children receiving a full course of irradiation was 280 days, compared to 140 days in an equivalent group of non-irradiated children. Hemiparesis presenting without cranial nerve symptoms and contrast enhancement on CT scan were poor prognostic factors, whereas sex, age, and duration of symptoms at diagnosis were unrelated to prognosis.     

肺癌脑转移的CT诊断

目的:提高对肺癌脑转移CT诊断的认识.方法:回顾性分析48例经手术及病理证实的肺癌脑转移的CT表现及特征.结果:腺癌21例,鳞癌11例,小细胞癌15例,细支气管肺泡癌1例.多发灶41例,单发灶7例.CT发现脑部转移灶126个;囊性病灶99个,实性病灶16个,囊实性病灶11个.幕上病灶112个,幕下病灶14个.结论:CT对肺癌脑转移有重要的诊断价值.     

彩超对肾移植术后并发肝脏恶性肿瘤的监测

目的　探讨彩超在肾移植术后并发肝脏恶性肿瘤监测中的应用价值。　方法　应用 Acuson12 8XP彩色多普勒超声诊断仪 ,对在我院行异体肾移植手术的终末期尿毒症患者 12 0 0例进行规律随访。　结果　发现 17例恶性肿瘤 ,其中肝癌 7例 ,占 4 1.17%。 5例肿块单发 ,2例多发 ;肿块最大 10 cm× 10 cm,最小 2 .3cm× 2 .1cm。其中 6例手术病理证实 ,1例肝活检证实。　结论　对移植肾术后患者 ,首选彩超随访肝脏变化 ,能早期发现肿瘤 ,为临床选择治疗方案提供时机 ,并提高换肾后发生恶性肿瘤患者的存活率     

游离和前列腺特异性抗原相互关系及临床应用

目的　评价总前列腺特异性抗原 (tPSA)、游离前列腺特异性抗原 (fPSA)及百分率 (f/tPSA % )检测前列腺癌 (PCa)的相关性及临床价值。方法　用酶免法测定 35例PCa及 73例良性前列腺增生 (BPH)患者血清tPSA水平 ,4tPSA <10ng/ml患者另测其fPSA ,计算f/tPSA(% )。 结果　血清tPSA <4、4～ 10、>10ng/ml者发现PCa的比例组间相比均有统计学意义。 4～ 10ng/ml组 ,PCa和BPH者f/tPSA(% )分别是 9.1± 4.8、16 .4± 6 .1,差别有显著意义 (P <0 .0 1)。结论　tPSA仍是PCa筛查的有效瘤标 ,tPSA低水平时 ,f/tPSA(% )检测PCa则更为灵敏精确。     

河南食管癌高、低发区无症状人群食管固有膜血管乳头的变化

目的：探讨食管癌高、低发区无症状居民食管上皮固有膜血管乳头（简称乳头）增生特征（乳头密度和高度）及其与病变分布的关系，加深对食管癌变早期形态学变化特征的了解。方法：2480例无症状人群食管粘膜活检组织，采用食管癌高低发区食管纤维内镜检查，粘膜活检，组织病理学检查和形态学测量技术对食管乳头的分布特征及其与病变的关系进行分析。结果：食管癌高低发区居民食管中、下段乳头升高（≥上皮厚度的1／2）发生率之间差异并不明显（P＞0．05），但是，高发区居民食管中段乳头密度（乳头数目／mm)明显高于下段，并高于低发区居民食管中段的乳头密度（P＜0．05）；高发区居民食管上皮乳头升高伴基底细胞过度增生患者明显高于正常人（P＜0．05），而低发区未观察到类似情况。结论：乳头增生表现为乳头数目增多和乳头升高是食管癌高发区人群食管上皮特征性形态学变化，高分区居民上皮乳头升高伴明显基底细胞过度增生，提示乳头增生可能是食管癌变极早期阶段的重要形态学变化，反映了上皮细胞的增生状态。