Abstract：
:Trypanosomatid protozoa lack consensus promoters for RNA polymerase (RNAP) II. However, the artificial insertion of the T7 promoter (P(T7)) and the tetracycline repressor into Trypanosoma brucei cell lines expressing T7RNAP allows P(T7)-driven gene expression to be tetracycline-inducible. These cell lines provide a molecular tool to address protein function by several recombinant approaches. We describe here the development of an analogous Leishmania chagasi cell line bearing the genes for exogenous T7RNAP and the tetracycline repressor inserted in the multi-gene alpha-tubulin locus. A plasmid construct with P(T7) and the tetracycline operator upstream of a reporter gene, when introduced into this cell line as episomal plasmids or chromosomal insertion into the non-coding strand of an 18SrRNA gene, resulted in tetracycline-inducible expression of the reporter as much as 16- and 150-fold, respectively. The reporter was under a much tighter control when chromosomally inserted than extra-chromosomally born. Furthermore, P(T7) augmented the reporter's expression 2-fold more in comparison to P(T7)-less constructs. This cell line is the first Leishmania spp. that allows the exogenous T7RNAP-driven gene expression to be tetracycline-inducible; and may provide a useful tool for addressing protein function by manipulating expression levels of Leishmania endogenous genes.
journal_name
Exp Parasitoljournal_title
Experimental parasitologyauthors
Yao C,Luo J,Hsiao CH,Donelson JE,Wilson MEdoi
10.1016/j.exppara.2007.01.001subject
Has Abstractpub_date
2007-07-01 00:00:00pages
205-13issue
3eissn
0014-4894issn
1090-2449pii
S0014-4894(07)00003-3journal_volume
116pub_type
杂志文章abstract：:This study presents the first genetic characterization of five Trypanosoma rangeli isolates from Minas Gerais, in the southeast of Brazil and their comparison with Colombian populations by minicircle classification, RAPD-PCR and LSSP-PCR analyses. Our results demonstrated a homogenous T. rangeli population circulating...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2007.03.007
更新日期：2007-09-01 00:00:00
abstract：:The release of beta-glucuronidase and lysozyme from human polymorphonuclear leukocytes (PMN) engaged in phagocytosis and lysis of Trypanosoma cruzi epimastigotes was studied in the presence or absence of chagasic serum. Lysosomal enzyme release was enhanced when parasites were sensitized with serum from a chronic Chag...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/0014-4894(83)90069-3
更新日期：1983-10-01 00:00:00
abstract：:Giardia lamblia undergo surface antigenic variation in vitro and in vivo. The presence of variant trophozoites can be detected in clones after exposure to cytotoxic monoclonal antibodies. Surviving Giardia (progeny) no longer possess the initial major surface antigen which is replaced by new antigens. Exposure of a cl...
journal_title：Experimental parasitology
pub_type： 杂志文章,评审
doi：10.1016/0014-4894(89)90104-5
更新日期：1989-02-01 00:00:00
abstract：:Toxocara canis is a dog helminth which causes visceral larva migrans (VLM) when infecting humans as a larva. The infection is demonstrated by detecting IgG antibodies against excretory-secretory larval antigens (ESLA) in serum by ELISA. The production of ESLA involves the collection of adult worms from dog puppy stool...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2008.03.006
更新日期：2008-07-01 00:00:00
abstract：:The infection with blood stages of Plasmodium chabaudi chabaudi (AS) was followed in BALB/c and DBA/2 mice. Both strains show a peak parasitemia by 7-9 days after infection, display splenic hypercellularity of T and B cells, thymic atrophy, nearly complete depletion of B cells in the bone marrow, and mount comparable ...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2005.03.024
更新日期：2005-08-01 00:00:00
abstract：:Serine hydroxymethyltransferase belongs to the class of pyridoxal-5-phosphate enzymes along with aspartate aminotransferase. To explore the function of residue(s) involved in binding of the carboxylate group of Tetrahydrofolic acid (THF) to L. donovani cytosolic serine hydroxymethyltransferase (LdcSHMT), the gene was ...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2014.12.004
更新日期：2015-02-01 00:00:00
abstract：:The study of the encystation process of Entamoeba histolytica has been hampered by the lack of experimental means of inducing mature cysts in vitro. Previously we have found that cytoplasmic vesicles similar to the encystation vesicles of Entamoeba invadens are present in E. histolytica trophozoites only in amebas rec...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2011.05.001
更新日期：2011-09-01 00:00:00
abstract：:Leishmania donovani, causative organism for visceral leishmaniasis, is responsible for considerable mortality and morbidity worldwide. Generation of drug-resistant variants continue to challenge the chemotherapy, the mainstay to fight the disease. The aim of current study was proteomic profiling of wild type (Ld-Wt) a...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2009.08.003
更新日期：2009-12-01 00:00:00
abstract：:The intestine of Haemonchus contortus is hypersensitive to the effects of the anthelmintic fenbendazole (FBZ). The effects are postulated to stem from disruption of microtubules and interference with apical secretory vesicle transport, followed by release of digestive enzymes into the intestinal cell cytoplasm. Here, ...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/s0014-4894(02)00135-2
更新日期：2002-08-01 00:00:00
abstract：:Trypanosoma rangeli is a parasite of a numerous wild and domestic animals, presenting wide geographical distribution and high immunological cross-reactivity with Trypanosoma cruzi, which may lead to misdiagnosis. T. rangeli has a complex life cycle, involving distinct morphological and functional forms in the vector. ...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2005.11.015
更新日期：2006-04-01 00:00:00
abstract：PURPOSE:Praziquantel (PZQ) is the conventional antibilharzial agent. Nevertheless, no antibilharzial prophylactic agents or 100% curable therapy approved and no reported data about use of human CD34+ Umbilical Cord Blood Stem Cells (CD34+UCBSCs) or Wharton Jelly Mesenchymal Stem Cells (WJMSCs) in prevention and/or comp...
journal_title：Experimental parasitology
pub_type： 杂志文章,评审
doi：10.1016/j.exppara.2020.107938
更新日期：2020-10-01 00:00:00
abstract：:Two experiments were performed to determine whether oral administration of copper oxide capsules controlled helminthic infections in Lacaune sheep without acute collateral effects on animal health. In experiment 1, 48 multiparous lactating sheep (60.1 ± 8.5 kg) were stratified according to initial number of eggs (Haem...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2019.107735
更新日期：2019-10-01 00:00:00
abstract：:Clonorchis sinensis is a fish-borne trematode endemic to East Asia, which infects over 35 million people globally. In the study described here, we developed a nested polymerase chain reaction (PCR) method for the specific and reliable detection of C. sinensis. The primers designed from the nucleotide sequence data der...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2006.09.010
更新日期：2007-03-01 00:00:00
abstract：:The biochemical and morphological events which accompany lysis of Trypanosoma brucei by normal human serum have been described. The prelytic events include loss of infectivity and rapid cation shifts across the cell membrane. This is followed by cell swelling, fraying of the surface coat of the cell, loss of intracell...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/0014-4894(84)90023-7
更新日期：1984-08-01 00:00:00
abstract：:Opisthorchis viverrini is the only liver fluke that has been proved to be associated with cholangiocarcinoma (CCA). However, the mechanisms by which O. viverrini participates in the carcinogenesis of CCA are still unclear. To understand the biology and host-parasite interaction related to O. viverrini infection, gene ...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2008.08.004
更新日期：2008-12-01 00:00:00
abstract：:We have studied inflammatory reactions in the mesenteric tissue of mice infected with Schistosoma mansoni. Perivascular tissue contained diffuse infiltrates of macrophages, eosinophilic granulocytes and lymphocytes. Angiogenesis in the perivascular adipose tissue was associated with superficial plasmacytogenic foci. P...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/0014-4894(92)90203-m
更新日期：1992-06-01 00:00:00
abstract：:Effects of maternal malnutrition during lactation on the kidneys in mice infected with Schistosoma mansoni. Kidneys from programmed infected mice and their respective controls fed a normal diet (23% protein), a protein-restricted group (PR) (8% protein) and a caloric-restricted group (CR) (according to the PR group in...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2013.03.025
更新日期：2013-07-01 00:00:00
abstract：:BmSI-7 and BmSI-6, two Boophilus microplus subtilisin inhibitors (BmSI) were purified and characterized from eggs. The inhibitors isolated by classical purification methods presented molecular masses of 7408 and 7271Da, respectively, by MALDI-TOF-MS. Both BmSI-7 and BmSI-6 inhibited neutrophil elastase (K(i) 0.4 and 0...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2007.08.003
更新日期：2008-02-01 00:00:00
abstract：:Increasing evidence indicates miRNAs as critical regulators of gene expression, but little information is available for miRNAs in intestinal diseases. Here, we investigated intestinal infections of male Balb/c mice with the coccidian parasite Eimeria papillata. On day 4 after oral infection, mice were shedding 3150 ± ...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2010.11.002
更新日期：2011-02-01 00:00:00
abstract：:The asexual development cycle of Plasmodium falciparum, a malarial parasite of humans, has been synchronized in culture by treating ring-stage parasites with aphidicolin, an inhibitor of DNA synthesis. Optimization of both the concentration of drug added to ring stage containing red blood cells and the duration of exp...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/0014-4894(84)90061-4
更新日期：1984-02-01 00:00:00
abstract：:Lipophosphoglycan (LPG) is structurally characterized by a series of phosphoglycan repeat units. Cellular LPG, isolated from promastigotes, has a very similar structure to culture supernatant LPG, but differs in the average number of phosphorylated oligosaccharide repeat units and in glycan composition. Comparison of ...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2009.09.017
更新日期：2010-02-01 00:00:00
abstract：:Schistosoma mansoni sporocysts originally derived from monomiracidially infected Biomphalaria glabrata snails were serially transplanted into the cephalopedal sinus of anesthetized snails by the microsurgical implantation of fragments of parasitized hepatopancreas and ovotestis. Three to six passages each of five male...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/0014-4894(84)90056-0
更新日期：1984-02-01 00:00:00
abstract：:Indirect immunocytochemistry, in conjunction with confocal scanning laser microscopy and electron-microscopic immunogold labeling, has been used to localize neuropeptide and 5-hydroxytryptamine (5-HT) immunoreactivities (IRs) in the plerocercoid (scolex and surrounding blastocyst) of the trypanorhynch tapeworm, Grillo...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1006/expr.1994.1103
更新日期：1994-11-01 00:00:00
abstract：:Acquisition of iron from lactoferrin and transferrin by a parasitic protozoon Tritrichomonas foetus has been studied in vitro. Specific, time-dependent, and saturable binding of iodinated ligands to the outer membrane of T. foetus at 4 degrees C was demonstrated for 125I-labeled lactoferrin only. About 1.7 x 10(5) bin...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1006/expr.1996.0068
更新日期：1996-07-01 00:00:00
abstract：:The risk of human hookworm infections from land application of wastewater matrices could be high in regions with high hookworm prevalence. A rapid, sensitive and specific hookworm detection method from wastewater matrices is required in order to assess human health risks. Currently available methods used to identify h...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2015.08.009
更新日期：2015-12-01 00:00:00
abstract：:Live adult and juvenile entomopathogenic Steinernema carpocapsae DD136 (P. Nematoda) were not subjected to adhesion by haemocytes of lepidopteran insect larvae of Galleria mellonella or Malacosoma disstriain vitro or in vivo. In vitro freeze-killed nematodes exhibited haemocyte attachment, the intensity increasing wit...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2008.07.001
更新日期：2008-10-01 00:00:00
abstract：:Mice were infected with 8- or 25-infective worms of advanced third stage Gnathostoma spinigerum larvae (L3) which were obtained from natural infected eels. On day 14, 60 and 200 post infections (PI), spleen cells of infected mice were tested for lymphoproliferative responses in vitro against the mitogen and specific L...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2012.08.002
更新日期：2012-11-01 00:00:00
abstract：:Intestinal cestodes with complex life cycles have to pass through the acid stomach lumen of their vertebrate host(s) in order to reach their preferred site of development. The cestode's tegument is the only organ in constant contact with this hostile environment. Procercoids of Schistocephalus solidus (order Diphyllob...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2013.01.019
更新日期：2013-05-01 00:00:00
abstract：:Cryptosporidiosis, caused by the protozoan parasite Cryptosporidium, represents the major public health concern of water utilities in developed nations due to its small size, resistance to disinfection and ability to be shed in large numbers in faeces. In Australia, recreational access is not allowed on direct supply ...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2012.04.015
更新日期：2012-08-01 00:00:00
abstract：:This study was designed to determine the effects of age and the role of spleen in rats with heavy Angiostrongylus cantonensis infection. Young rats (8 weeks) infected with 100 larvae were found to have significantly higher worm recovery rate (75.0±6.6%) than the adult (6 months) (55.7±1.5%) and the aging ones (13 mont...
journal_title：Experimental parasitology
pub_type： 杂志文章
doi：10.1016/j.exppara.2012.04.004
更新日期：2012-06-01 00:00:00
