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排序方式: 共有206条查询结果,搜索用时 15 毫秒
51.
Pui CH; Carroll AJ; Head D; Raimondi SC; Shuster JJ; Crist WM; Link MP; Borowitz MJ; Behm FG; Land VJ 《Blood》1990,76(3):590-596
Cytogenetic and DNA flow cytometric analyses of leukemic cells from 1,971 children with newly diagnosed acute lymphoblastic leukemia (ALL) identified stem lines with modal chromosome numbers greater than 65 in 26 patients (1.3%). Near-triploidy (66 to 73 chromosomes) was found in six cases and near-tetraploidy (82 to 94 chromosomes) in 20. A striking morphologic finding was the presence of clumped chromatin with grooved nuclei or Rieder cell formation in 20 cases. Other than a slight excess of the pre-B immunophenotype, the near-triploid cases did not appear to differ substantially from the general ALL population in clinical features. In contrast, near-tetraploid cases were more often associated with a T-cell immunophenotype (47% v 14%, P less than .001) and L2 morphology (30% v 22%, P less than .01), and were older at diagnosis (median age, 8.6 v 4.8 years, P = .01) than cases with other ploidies. Moreover, an unusually high proportion of near-tetraploid cases tested (6 of 15) expressed one or more of the myeloid-associated antigens CD13, CD15, and CD33. Despite the use of contemporary intensive chemotherapy and short follow-up for most patients, 6 of the 20 near- tetraploid cases have relapsed or died. This study suggests that the near-tetraploid subtype differs from other cases of hyperdiploid greater than 50 ALL, which have been associated with a favorable prognosis. 相似文献
52.
Platelets express a membrane protein complex immunologically related to the fibroblast fibronectin receptor and distinct from GPIIb/IIIa 总被引:4,自引:0,他引:4
We have previously identified and characterized a membrane glycoprotein complex (GP150/135) that functions as fibronectin receptor (FN-R) in fibroblast adhesion. Here we report that an immunologically related protein complex is expressed at the surface of human platelets. Antibodies monospecific for the smaller subunit (GP135) of the fibroblast FN-R in fact specifically stained the platelet surface, as determined by FACS analysis, and reacted with a component of molecular weight (mol wt) 138,000 as shown in western blots of platelet membranes. Moreover, the same antibodies precipitated the 138,000 component together with a 160,000 protein, suggesting that the two molecules are associated in a supramolecular complex. A comparative analysis indicated that this protein complex is distinct from the GPIIb/IIIa complex, known to function as a receptor of wide specificity for fibrinogen, fibronectin, and von Willebrand factor. Differential extraction experiments revealed that the platelet 138,000 component is an integral membrane protein. 相似文献
53.
FG K?ln 《MedR Medizinrecht》2008,26(5):320-322
Abstrakt Bedient sich ein Arzt nicht nur vorübergehend der Mithilfe eines Berufskollegen, so erzielt er
Einkünfte aus Gewerbebetrieb, wenn er nicht eigenverantwortlich dessen T?tigkeiten überwacht
und wenn der Berufskollege auch nicht als Mitunternehmer t?tig ist. 相似文献
54.
55.
Bork S Yokoyama N Matsuo T Claveria FG Fujisaki K Igarashi I 《The American journal of tropical medicine and hygiene》2003,68(3):334-340
We evaluated the growth inhibitory effect of triclosan, which has recently been reported to inhibit the growth of Plasmodium species and Toxoplasma gondii, on bovine and equine Babesia parasites in in vitro cultures The growth of Babesia bovis and B. bigemina was significantly inhibited in the presence of 100 microg/ml of triclosan, while B. caballi and B. equi were susceptible to as low as 50 microg/ml. Babesia bigemina and B. caballi were completely cleared as early as on the first and second day of the treatment, respectively. These parasites did not exhibit any growth in the subsequent five-day period of subculture without triclosan. Drug-treated parasites appeared pycnotic and atypically shaped, and ultrastructurally showed pronounced vacuolations, leading to complete destruction of parasites. Light microscopy showed that used concentrations of triclosan showed no toxicity against the host cells. The results suggest that triclosan can be used for chemotherapy of babesiosis. 相似文献
56.
Metabolism of 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) by human cytochrome P4501B1 总被引:1,自引:1,他引:1
Cytochrome P4501B1 (CYP1B1) is the most recently identified member of the
dioxin-inducible CYP1 family. CYP1B1 is constitutively expressed in most
human tissues, including colon and breast, and can activate numerous
chemically diverse carcinogens. We evaluated the metabolism of the dietary
heterocyclic amine carcinogen 2-amino-1-methyl-6-
phenylimidazo[4,5-b]pyridine (PhIP) by microsomes from yeast expressing the
human CYP1B1 protein. PhIP metabolites were analysed by HPLC with
fluorescence and absorbance detection. We found that human CYP1B1
metabolizes PhIP to three products: N2-OH-PhIP, a mutagenic activation
product; 4'-OH-PhIP, a detoxification product; and 2-OH-PhIP, the mutagenic
potential of which is unknown. Metabolite identity was confirmed by
co-elution with authentic standards and synchronous fluorescence
spectroscopy. The identity of the 2-OH-PhIP standard was additionally
confirmed by mass spectrometry. Kinetic studies of the formation of
N2-OH-PhIP, 4'-OH-PhIP and 2-OH-PhIP by CYP1B1 indicated apparent Km values
of 5.7 +/- 1.3, 2.2 +/- 0.5 and 1.3 +/- 0.2 microM, respectively. Apparent
turnover rates were 0.40 +/- 0.03, 0.93 +/- 0.02 and 0.04 +/- 0.00 nmol
product/min nmol P450, respectively. At saturating levels of substrate,
CYP1B1-mediated formation of the non- mutagenic metabolite 4'-OH-PhIP was
favored two-fold over that of the mutagenic metabolite, N2-OH-PhIP and
>10-fold over that of 2-OH-PhIP. The formation of N2-OH-PhIP, a potent
mutagen implicated in the etiology of human colon and breast cancer,
indicates that CYP1B1 may play an important role in PhIP-mediated
carcinogenesis.
相似文献
57.
Kadota K Walter S Claveria FG Igarashi I Taylor D Fujisaki K 《Journal of medical entomology》2003,40(6):770-776
The ultrastructure and characteristics of hemocytes of argasid tick species, Ornithodoros moubata, during the ecdysdial phase are herein presented. Hemocyte classes/populations characterized based on their affinity with Giemsa stain and ultrastructural differences comprised the prohemocytes, nongranular cells (Nc), eosinophilic granular cells (Ec), basophilic granular cells (Bc), and unidentified cells. Significant changes/shift in the ratio of hemocyte classes/population was apparent in ticks before and after the ecdysial phase. The granule-scant basophilic granular cells (sBc) constituted the most abundant hemocyte population in the ecdysial phase. Nymphs in ecdysis showed increases in Nc and sBc and decrease in Ec, a phenomenon that was reversed in unengorged nymphs and adults ticks. The significant increase in total Bc population in ecdysis relative to nonengorged ticks clearly point to blastogenesis of Bc taking place during the ecdysial phase and Bc's important role in the process of tissue remodeling. 相似文献
58.
59.
60.
Bromocriptine in Parkinsonism 总被引:5,自引:0,他引:5
D B Calne P F Teychenne L E Claveria R Eastman J K Greenacre A Petrie 《British medical journal》1974,4(5942):442-444