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1.
Genes for serum amyloid A proteins map to Chromosome 7 in the mouse 总被引:10,自引:0,他引:10
Summary Several restriction fragment length variants have been detected among inbred strains using a mouse serum amyloid A cDNA clone. Five variants were shown to segregate as a single genetic unit and were mapped to Chromosome 7 between the glucose phosphate isomerase locus (Gpi-1) and the pink eye dilution locus (p) using recombinant inbred and congenic strains. The finding that no major MspI or BclI restriction fragments were shared between digests of DNAs from a Chromosome 7 congenic strain and its inbred partner, indicate that most, and probably all, sequences detected with the probe are clustered on Chromosome 7. Aneuploid mapping was used to show that the serum amyloid A gene complex (Saa) is proximal to the Chromosome 7 breakpoint in T(7;X)1Ct, a translocation in which the middle third of Chromosome 7 is inserted into the X-chromosome. A survey of inbred strains revealed a single common Saa haplotype and eight rare haplotypes. The complex distribution of 14 different variants suggests that recombination may have played a role in haplotype evolution.This work was supported by grants GM18684 and CA33093 from the National Institute of General Medical Sciences and the National Cancer Institute, respectively. 相似文献
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Max R. Taylor Lucy A. Lawson Virginia G. Lockard William R. Lockwood 《Mycopathologia》1984,88(2-3):173-180
Electron microscopic examination of yeasts of Blastomyces dermatitidis, exposed in vitro to concentrations of lidocaine that occur when the drug is used for topical anesthesia, showed that lidocaine rapidly damaged intracellular structures. The extent of damage was dependent on the concentration of drug and length of exposure. The observed ultrastructural changes were very similar to those reported for other drugs that directly damage membranes. This relationship suggests that the antifungal effect of lidocaine is the result of direct membrane damage. 相似文献
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Calcium-activated thiol-proteinase activity in the fusion of rat erythrocytes induced by benzyl alcohol. 总被引:8,自引:2,他引:6 下载免费PDF全文
1. Rat erythrocytes were fused by incubation with benzyl alcohol and Ca2+. 2. Cell fusion was inhibited by EGTA, N-ethylmaleimide, tetrathionate, iodoacetamide, cystamine, Tos-Lys-CH2Cl, and to a lesser extent by Tos-Phe-CH2Cl. Phenylmethanesulphonyl fluoride, Tos-Arg-OMe and histamine did not inhibit cell fusion. 3. Gel electrophoresis of membrane proteins from "ghosts" of the erythrocytes treated with benzyl alcohol showed that a high-molecular-weight polymer was present: this was consistent with the entry into the cells of Ca2+ and the activation of a transglutaminase enzyme. 4. In the treated cells the proteins corresponding to bands 2 and 3 in human erythrocytes were decreased, and a polypeptide with a slightly greater mobility than band 3 was produced. 5. These changes were inhibited by EGTA, N-ethylmaleimide, tetrathionate, iodoacetamide, cystamine, and Tos-Lys-CH2Cl, but not by phenylmethanesulphonyl fluoride, Tos-Arg-OMe, or histamine. 6. The intramembraneous particles of the P-fracture face of cells treated with benzyl alcohol to induce fusion were decreased in number and were susceptible to cold-induced aggregation; both of these phenomena were markedly inhibited to EGTA, and partially inhibited by Tos-Lys-CH2Cl and N-ethylmaleimide. 7. These several observations indicate that a Ca2+-activated thiol-proteinase, which acts to degrade membrane proteins and to give freedom of lateral movement to intramembranous particles, may be essential feature of membrane fusion in this system. 8. It is suggested that this proteinase may act to degrade spectrin-binding proteins that attach band-3 protein to the erythrocyte cytoskeleton. 相似文献
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Summary A continuous-flow system is described which, by measuring fluorescence of the unicellular alga Chlorella, is capable of measuring concentrations of the triazine herbicide, simazine, as low as 60nM (approx 12g l-1) within 5 minutes. Further developments are suggested to achieve the desired detection limit of 0.5nM. The use of such an instrument in environmental analysis is discussed. 相似文献
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Lucy A. Barrett Wolfgang J. Mergner Benjamin F. Trump 《In vitro cellular & developmental biology. Plant》1979,15(12):957-966
Summary Segments of human thoracic aorta were maintained in long-term explant culture for 18 weeks in serum-supplemented medium. The
aortas were grossly normal in appearance, and random samples fixed for light microscopy prior to culture revealed a normal
morphology. The intima contained no more than five layers of smooth muscle cells. After 7 days in culture, the intima was
noticeably thicker than the uncultured segments. The increased thickness was due to proliferating smooth muscle cells and
production of extracellular material. After several months in culture, extracellular material consisting of collagen and flocculent
material was present in areas resembling atherosclerotic fibrous plaques. A peripheral growth, which formed around the explant,
was composed of fibroblastlike cells and added to the overall thickness of the intima. However, aortic segment maintained
for up to 2 months in serum-free culture medium showed no cellular proliferation. This study demonstrates that changes resembling
early stages of atherosclerosis occur in human aortas maintained in explant culture using routine culture procedures.
Supported in part by the Pangborn Fund and the Graduate School of the University of Maryland.
This is publication 443 from the Cellular Pathobiology Laboratory. 相似文献
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Martin Gael Oyono Sebastien Kenmoe Ngu Njei Abanda Guy Roussel Takuissu Jean Thierry Ebogo-Belobo Raoul Kenfack-Momo Cyprien Kengne-Nde Donatien Serge Mbaga Serges Tchatchouang Josiane Kenfack-Zanguim Robertine Lontuo Fogang Elisabeth Zeukoo Menkem Juliette Laure Ndzie Ondigui Ginette Irma Kame-Ngasse Jeannette Nina Magoudjou-Pekam Arnol Bowo-Ngandji Seraphine Nkie Esemu Lucy Ndip 《PLoS neglected tropical diseases》2022,16(7)
Yellow fever (YF) has re-emerged in the last two decades causing several outbreaks in endemic countries and spreading to new receptive regions. This changing epidemiology of YF creates new challenges for global public health efforts. Yellow fever is caused by the yellow fever virus (YFV) that circulates between humans, the mosquito vector, and non-human primates (NHP). In this systematic review and meta-analysis, we review and analyse data on the case fatality rate (CFR) and prevalence of YFV in humans, and on the prevalence of YFV in arthropods, and NHP in sub-Saharan Africa (SSA). We performed a comprehensive literature search in PubMed, Web of Science, African Journal Online, and African Index Medicus databases. We included studies reporting data on the CFR and/or prevalence of YFV. Extracted data was verified and analysed using the random effect meta-analysis. We conducted subgroup, sensitivity analysis, and publication bias analyses using the random effect meta-analysis while I2 statistic was employed to determine heterogeneity. This review was registered with PROSPERO under the identification CRD42021242444. The final meta-analysis included 55 studies. The overall case fatality rate due to YFV was 31.1% (18.3–45.4) in humans and pooled prevalence of YFV infection was 9.4% (6.9–12.2) in humans. Only five studies in West and East Africa detected the YFV in mosquito species of the genus Aedes and in Anopheles funestus. In NHP, YFV antibodies were found only in members of the Cercopithecidae family. Our analysis provides evidence on the ongoing circulation of the YFV in humans, Aedes mosquitoes and NHP in SSA. These observations highlight the ongoing transmission of the YFV and its potential to cause large outbreaks in SSA. As such, strategies such as those proposed by the WHO’s Eliminate Yellow Fever Epidemics (EYE) initiative are urgently needed to control and prevent yellow fever outbreaks in SSA. 相似文献
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