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91.
92.
P I Forrester P C Lai R L Hancock D M Hay F L Lorscheider 《International archives of allergy and applied immunology》1978,57(1):57-61
Immunoelectrophoresis showed that rabbit anti-human alpha-fetoprotein (AFP) cross-reacts with monkey AFP which was not detectable in the serum from an adult non-pregnant monkey. A heterologous radioimmunoassay of monkey AFP was developed using this antiserum which circumvented the need for purified monkey AFP. The radioimmunoassay is of sufficient sensitivity to measure AFP in maternal and fetal serum and amniotic fluid in the rhesus monkey. 相似文献
93.
The mast cell protective effects of the newly developed long-acting
2-adrenergic salmeterol and formoterol were compared with those of conventionally used
2-adrenergic, non-specific -agonists, disodium cromoglycate (DSCG) and theophylline. With the exception of DSCG, all the test agents inhibited ovalbumin-induced histamine release from enzymically dispersed guinea pig lung mast cells in a dose-dependent fashion. At the maximum concentration tested, theophylline produced the highest level of protection, inhibiting up to 90% of ovalbumin-induced histamine release whereas DSCG produced only 10% inhibition. The maximum inhibition produced by all the
2-adrenergic tested was around 45%. While salmeterol was equipotent with salbutamol, formoterol was at least a 100-fold more potent. Hence the present study confirmed the previously reported mast cell stabilizing actions of conventional
2-adrenergic and extended the observation to the newly developed long-acting analogues. 相似文献
94.
Expression of Mcl-1 in mantle cell lymphoma is associated with high-grade morphology,a high proliferative state,and p53 overexpression 总被引:8,自引:0,他引:8
Khoury JD Medeiros LJ Rassidakis GZ McDonnell TJ Abruzzo LV Lai R 《The Journal of pathology》2003,199(1):90-97
Mantle cell lymphoma (MCL) is a distinct type of B-cell non-Hodgkin's lymphoma characterized by the t(11;14)(q13;q32) and cyclin D1 overexpression. Defects in apoptosis may contribute to pathogenesis. This study evaluated the expression of the anti-apoptotic protein Mcl-1 in two MCL cell lines and five frozen MCL tumours (four small-cell, one blastoid/large-cell) using western blot analysis. Mcl-1 expression was also assessed in 36 formalin-fixed, paraffin wax-embedded MCL tumours (24 small-cell, 12 blastoid/large-cell) by immunohistochemistry. Western blot analysis revealed the expected 37 kD protein product in both MCL cell lines and in five frozen tumours, with the blastoid case having the highest expression level. Using a cut-off of >10% immunolabelled cells for Mcl-1, it was found that 12 of 36 MCL tumours were positive. Mcl-1-positive tumours had a higher frequency of blastoid/large-cell morphology (8/12 versus 4/24, p = 0.009), p53 overexpression (3/10 versus 1/23, p = 0.04), and higher Ki67 immuno-labelling (p = 0.002). It is concluded that expression of Mcl-1 in MCL is heterogeneous. A relatively high level of Mcl-1 expression correlates with high-grade morphology, a high proliferative state, and p53 overexpression. 相似文献
95.
Maeno-Hikichi Y Chang S Matsumura K Lai M Lin H Nakagawa N Kuroda S Zhang JF 《Nature neuroscience》2003,6(5):468-475
Multiple protein kinase C (PKC) isozymes are present in neurons, where they regulate a variety of cellular functions. Due to the lack of specific PKC isozyme inhibitors, it remains unknown how PKC acts on its selective target(s) and achieves its specific actions. Here we show that a PKC binding protein, enigma homolog (ENH), interacts specifically with both PKCepsilon and N-type Ca2+ channels, forming a PKCepsilon-ENH-Ca2+ channel macromolecular complex. Coexpression of ENH facilitated modulation of N-type Ca2+ channel activity by PKC. Disruption of the complex reduced the potentiation of the channel activity by PKC in neurons. Thus, ENH, by interacting specifically with both PKCepsilon and the N-type Ca2+ channel, targets a specific PKC to its substrate to form a functional signaling complex, which is the molecular mechanism for the specificity and efficiency of PKC signaling. 相似文献
96.
F. W. S. Ko H. Y. Wang† G. W. K. Wong‡ T. F. Leung‡ D. S. C. Hui D. P. S. Chan N. S. Zhong† C. K.W. Lai 《Clinical and experimental allergy》2005,35(11):1449-1456
BACKGROUND: Asthma is a common chronic disease and information on its management practices at the community level is helpful in identifying problems and improving asthma care. OBJECTIVE: To assess the severity status and management of the asthma symptom of wheeze of children at the community level in Hong Kong (HK) and Guangzhou (GZ). METHODS: Cross-sectional study of children aged 10 years using the International Study of Asthma and Allergic disease in Childhood (ISAAC Phase II protocol). Asthma management and lung function were assessed in 178 (98 from HK and 80 from GZ) randomly selected children with wheeze over the past 12 months. RESULTS: Eighty-three percent, 11%, 6% and 0% of children suffered from intermittent, mild persistent, moderate persistent and severe persistent asthma, respectively, according to the frequency of their symptoms. Addition of spirometric parameter only changed the asthma severity classification in 2.8% of children. Medications were used by 30.6% and 71.3% of children for wheeze in HK and GZ, respectively. In HK, inhaled beta(2)-agonist (73.3% among the drug users) was the commonest medication used followed by inhaled corticosteroid (ICS) (23.3%). In GZ, inhaled beta(2)-agonist was used by 75.4% of children, but use of ICS (26.3%), oral beta(2)-agonist (26.3%), oral theophylline (45.6%), oral ketotifen (36.8%) and oral steroid (35.1%) were also common. ICS was only used by 11.4% of children with persistent asthma. Ten percent and 18.7% of children in HK and GZ, respectively, had emergency department visits, while 16.3% and 11.6% of children in HK and GZ, respectively, had missed school secondary to asthma over the past 1 year. CONCLUSIONS: Most children in the community had intermittent asthma and addition of lung function to symptoms did not significantly affect classification of asthma severity. Significant morbidity was seen even in this group of children with mostly intermittent and mild persistent asthma. 相似文献
97.
Alessia Lai Annalisa Bergna Carla Acciarri Massimo Galli Gianguglielmo Zehender 《Journal of medical virology》2020,92(6):675-679
To reconstruct the evolutionary dynamics of the 2019 novel-coronavirus recently causing an outbreak in Wuhan, China, 52 SARS-CoV-2 genomes available on 4 February 2020 at Global Initiative on Sharing All Influenza Data were analyzed. The two models used to estimate the reproduction number (coalescent-based exponential growth and a birth-death skyline method) indicated an estimated mean evolutionary rate of 7.8 × 10−4 subs/site/year (range, 1.1 × 10−4-15 × 10−4) and a mean tMRCA of the tree root of 73 days. The estimated R value was 2.6 (range, 2.1-5.1), and increased from 0.8 to 2.4 in December 2019. The estimated mean doubling time of the epidemic was between 3.6 and 4.1 days. This study proves the usefulness of phylogeny in supporting the surveillance of emerging new infections even as the epidemic is growing. 相似文献
98.
Lai AC Chambers TM Holland RE Morley PS Haines DM Townsend HG Barrandeguy M 《Archives of virology》2001,146(6):1063-1074
Summary. We reported previously that equine-2 influenza A virus (H3N8) had evolved into two genetically and antigenically distinct
“Eurasian” and “American” lineages. Phylogenetic analysis, using the HA1 gene of more recent American isolates, indicated
a further divergence of these viruses into three evolution lineages: A South American lineage, a Kentucky lineage, and a Florida
lineage. These multiple evolution pathways were not due to geographic barriers, as viruses from different lineages co-circulated.
For the Kentucky lineage, the evolution rate was estimated to be 0.89 amino acid substitutions per year, which agreed with
the previously estimated rate of 0.8. For the South American lineage, the evolution rate was estimated to be only 0.27 amino
acid substitutions per year. This low evolution rate was probably due to a unique alternating Ser138 to Ala138 substitutions
at antigenic site A. For the Kentucky lineage, there was a preference for sequential nonsynonymous substitutions at antigenic
site B, which was also a “hot spot” for amino acid substitutions. Convalescent sera had minimal cross-reactivity to viruses
of different lineages, indicating antigenic distinctions among these viruses. In contrast to human H3N2 viruses, our results
suggested that the evolution of equine-2 influenza virus resembled the multiple evolution pathways of influenza B virus.
Accepted December 14, 2000 Received September 19, 2000 相似文献
99.
Ewanowich C Brynes RK Medeiros L McCourty A Lai R 《Archives of pathology & laboratory medicine》2001,125(2):208-210
OBJECTIVE: We previously surveyed cyclin D1 expression in common acquired nevi, Spitz nevi, and malignant melanomas and reported that benign nevi maintain a zonal pattern of cyclin D1 expression, in contrast with malignant melanomas. Our aim was to extend those observations by examining cyclin D1 expression in dysplastic nevi. METHODS: Cyclin D1 overexpression in 23 dysplastic nevi was detected by an immunohistochemical technique. The extent of atypia of the nevi was graded as mild, moderate, or severe, using previously established criteria. RESULTS: Cyclin D1 overexpression in dysplastic nevi maintained a zonal pattern, similar to Spitz nevi. Cyclin D1 overexpression was greatest in the region of the epidermal-dermal junction and was significantly less prominent in the papillary and reticular dermis, suggesting that cyclin D1 expression is under cell control and correlates with maturation of nevus cells. Cyclin D1 overexpression also correlated with cytologic atypia, as dysplastic nevi with moderate or severe cytologic atypia contained a greater percentage of cyclin D1-positive cells than did nevi with mild atypia. Six dysplastic nevi with many cyclin D1--positive cells were assessed by fluorescence in situ hybridization studies using cyclin D1--specific and chromosome 11 centromeric probes. In all cases, there was no evidence of 11q13 translocation, amplification, or trisomy of chromosome 11. CONCLUSIONS: Cyclin D1 may be involved in the pathogenesis of dysplastic nevi. Cyclin D1 overexpression does not appear to be explained by cyclin D1 locus amplification or translocation in most cases, and it may be a result of other cell abnormalities that up-regulate the protein level of cyclin D1. 相似文献
100.
目的:研制抗血小板膜糖蛋白Ⅱb/Ⅲa Fab抗体。方法:通过问接免疫荧光试验和血小板聚集抑制试验,选取鼠源抗血小板糖蛋白Ⅱb/Ⅲa单克隆抗体(mAb P140)。从分泌该mAb的杂交瘤细胞株(P140)中,克隆到抗体轻链基因和重链Fd段基因,构建原核表达重组质粒p3MH/P140x-Fd,并在XLI-Blu菌株中进行表达。采用钴亲和层析法对P140 Fab抗体进行纯化,用SDS-PAGE、ELISA和Western blot等方法,对P140 Fab抗体进行检测,并通过血小板聚集抑制试验,观察P140 Fab抗体的抗栓活性。结果:SDS-PAGE和Western blot表明,纯化的P140Fab抗体的相对分子质量(Mr)约为47000。ELISA的结果显示,P140 Fab抗体可与人血小板特异性结合。在体外ADP诱导的血小板聚集试验中,P140 Fab抗体对血小板聚集的抑制作用成剂量依赖性,IC50的平均值为16.85mg/L。结论:成功地研制出具有抗栓活性的抗血小板膜糖蛋白Ⅱb/Ⅲa的Fab抗体。 相似文献