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Sent on Tuesday, 2012 January 17Search: kinetoplastids OR kinetoplastid OR Kinetoplastida OR "trypanosoma brucei" OR leishmania OR brucei OR leishmaniasis OR "African trypanosomiasis"
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| PubMed Results |
| 1. | Bull Soc Pathol Exot. 2012 Jan 13. [Epub ahead of print][Epidemiology of cutaneous leishmaniasis in five villages of Dogon country, Mali.] [Article in French] Kone AK, Delaunay P, Djimdé AA, Thera MA, Giudice PD, Coulibaly D, Traoré K, Goita SM, Abathina A, Izri A, Marty P, Doumbo OK.SourceFaculté de Médecine de Pharmacie et d'Odonto-Stomatologie, Département d'Epidémiologie des Affections Parasitaires, Malaria Research and Training Center, Université de Bamako, BP 1805, Point G, Bamako, Mali. AbstractThe epidemiology of the cutaneous leishmaniasis (CL) with Leishmania major is poorly documented in Mali. Following reports of CL in the tourist areas of the Dogon country (Bandiagara Escarpment), a joint French and Malian bio-clinical team conducted a field study from 16 to 27 January, 2010. The population of 5 villages has been examined by a dermato-infectiologist and cases were selected by visual inspection of skin lesions. Smears and biopsies (from the lesions) and venous blood were obtained from suspected cases of CL. Diagnosis was performed by light microscopy, in vitro cultures, serology and molecular biology. Fifty patients with skin lesions have been examined. Twenty-one have been suspected as CL. At least one sample was obtained from 18 patients. The lesions were predominantly old, more or less scarring and secondary infected. A skin smear was performed for 15 patients, a skin biopsy for 14 patients: smears and cultures were all negative. The PCR (Leishmania spp.) made on 14 biopsies was positive for 12 patients (86%). The low amount of amplified DNA obtained did not allow the sequencing and identification of the species of Leishmania. Western blot (WB) serology was positive in 11 cases out of 12 (92%). This investigation showed the presence of cutaneous leishmaniasis in Bandiagara. A further investigation is required during transmission period (September-October) to confirm the presence of Leishmania major epidemic in Dogon country. |
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| 2. | Parasitol Res. 2012 Jan 14. [Epub ahead of print]Zoophilic feeding behaviour of phlebotomine sand flies in the endemic areas of cutaneous leishmaniasis of Sindh Province, Pakistan.Tiwananthagorn S, Bhutto AM, Baloch JH, Soomro FR, Kawamura Y, Nakao R, Aoshima K, Nonaka N, Oku Y, Katakura K.SourceLaboratory of Parasitology, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo, 060-0818, Japan. AbstractLeishmania (Leishmania) major has been identified as the major causative agent of cutaneous leishmaniasis in Sindh Province of southern Pakistan. To make a rational approach for understanding the pathogen transmission cycles, the sand fly species and their natural blood meals in the endemic areas were examined. Total DNA was individually extracted from sand flies collected in four villages in Sindh Province. PCR-RFLP (restriction fragment length polymorphism) and sequence analysis of the 18S ribosomal RNA gene revealed that female sand flies identified were Sergentomyia clydei/Sergentomyia ghesquierei/Sergentomyia magna (68.6%), Sergentomyia dubia (17.1%), Phlebotomus papatasi (7.4%), Phlebotomus alexandri-like sand flies (3.4%) and Sergentomyia dentata (3.4%). PCR amplification of leishmanial kinetoplast DNA did not result in positive signals, suggesting that all 175 tested female sand flies were not infected with leishmanial parasites or contained undetectable levels of leishmanial DNA. Amplification and sequencing of the vertebrate cytochrome b gene in 28 blood-fed sand flies revealed that P. papatasi fed on cattle and wild rat whereas P. alexandri-like specimens fed on human, cattle, goat and dog. Although Sergentomyia sand flies are generally known to feed on cold-blooded animals, S. clydei, S. dubia and S. ghesquierei preferred humans, cattle, goat, sheep, buffalo, dog, donkey, wild rat and Indian gerbil. The epidemiological significance of the zoophilic feeding on various host species by Phlebotomus and Sergentomyia sand flies in Pakistan is further required to study for better understanding the zoonotic transmission of sand-fly-borne pathogens and for appropriate management of the vectors. |
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| 3. | Fitoterapia. 2012 Jan 8. [Epub ahead of print]Antiparasitic antioxidant phenylpropanoids and iridoid glycosides from Tecoma mollis.Abdel-Mageed WM, Backheet EY, Khalifa AA, Ibraheim ZZ, Ross SA.SourcePharmacognosy Department, Faculty of Pharmacy, Assiut University, Assiut, Egypt. AbstractA radical scavenging guided phytochemical study on the stem bark of Tecoma mollis afforded seven active phenylpropanoid glycosides (1-7), including a new one (4), and one iridoid (8). The structures of the isolated compounds were elucidated on the basis of spectroscopic evidences and correlated with known compounds. Compounds (1-7) displayed promising antioxidant activity (DPPH assay) in relation to ascorbic acid (positive control). The antimicrobial activity for compounds (1-8) was evaluated against five bacterial and five fungal strains. The isolated compounds exhibited nonselective weak to moderate antimicrobial activity. The highest antileishmanial activity against Leishmania donovani was observed for compound (7) with an IC(50) value of 6.71μg/ml, using pentamidine and amphotericin B as drug controls. Compound (5) exhibited moderate antimalarial activity (45% inhibition) against chloroquine sensitive (D6) clones of Plasmodium falciparum. Copyright © 2012. Published by Elsevier B.V. |
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| 4. | Vet Parasitol. 2011 Dec 19. [Epub ahead of print]Apparent lack of a domestic an imal reservoir in Gambiense sleeping sickness in northwest Uganda.Balyeidhusa AS, Kironde FA, Enyaru JC.SourceDepartment of Biochemistry, Makerere University, P.O. Box 7062, Kampala, Uganda. AbstractThe role played by domestic animals in the transmission of gambiense Human African Trypanosomosis remains uncertain. Northwest Uganda is endemic for Trypanosoma brucei gambiense. Of the 3267 blood samples from domestic animals in four counties examined by hematocrit centrifugation technique (HCT), 210 (6.4%) were positive for trypanosomes. The prevalence of animal trypanosomosis was estimated at 13.8% in Terego County, 4.2% in East Moyo County, 3.1% in Koboko County, and zero in West Moyo County. The trypanosome infection rates varied from 0.2% in goats, 3.5% in dogs, 5.0% in sheep, 7.5% in cattle, to 15.5% in pigs. DNA was extracted from the blood samples by Chelex method, Sigma and Qiagen DNA extraction Kits. A total of 417(12.8%) DNA samples tested positive by polymerase chain reaction (PCR) using T. brucei species specific primers (TBR) indicating that the DNA was of Trypanozoon trypanosomes while 2850 (87.2%) samples were TBR-PCR negative. The T. brucei infection rates based on TBR-PCR were highest in pigs with 21.7%, followed by cattle (14.5%), dogs (12.4%), sheep (10.8%), and lowest in goats with 3.2%, which indicated that pigs were most bitten by infected tsetse than other domestic animals. TBR-PCR detected 6.3% more infected domestic animals that had been missed, and confirmed the 6.4% cases detected by HCT in the field. Statistical analysis done using one-way ANOVA Kruskal-Wallis test (Prism version 5.0) showed no significant difference in trypanosome infections among domestic animals using both HCT and TBR-PCR techniques in the different counties (Confidence Interval of 95%, p-values >0.05). All the 417 trypanosome DNA samples were negative by PCR using two sets of primers specific for the T. b. gambiense specific glycoprotein gene and serum resistance associated gene of T. b. rhodesiense, indicating that they were probably not from the two human infective trypanosomes. Polymerase chain reaction using primers based on ribosomal internal transcribed spacer-1 region (ITS-PCR) resolved the 417 DNA of trypanosome samples into 323 (77.5%) as single trypanosome infections due to T. brucei and 39 (9.4%) mixed infections but missed detecting 55 (13.1%) samples, possibly because of the low sensitivity of ITS-PCR as compared to TBR-PCR. The 31 mixed infections were due to T. brucei (T.b) and T. vivax (T.v); while 8 mixed infections were of T. congolense (T.c) and T. brucei but no mixed trypanosome infections with T. congolense, T. brucei, and T. vivax were detected. Statistical analysis done using one way ANOVA Kruskal-Wallis test (Prism version 5.0) to compare single and mixed trypanosome infections showed no significant difference in trypanosome infections due to single (T.v, T.b, T.c) and mixed (T.v+T.b; T.v+T.c; T.b+T.c; T.v+T.b+T.c) trypanosome species among domestic animals in the different counties using ITS-PCR technique (Confidence Interval of 95%, p-values >0.05). It was concluded that domestic animals in northwest Uganda were probably not reservoirs of T. b. gambiense and there was no infection, as yet, with T. b. rhodesiense parasites. Copyright © 2011 Elsevier B.V. All rights reserved. |
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| 5. | J Biol Chem. 2011 Nov 25;286(47):40566-74. Epub 2011 Oct 8.Interactions of a replication initiator with histone H1-like proteins remodel the condensed mitochondrial genome.Kapeller I, Milman N, Yaffe N, Shlomai J.SourceDepartment of Microbiology and Molecular Genetics, The Kuvin Center for the Study of Infectious and Tropical Diseases, Institute of Medical Research Israel-Canada, The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel. AbstractKinetoplast DNA (kDNA), the mitochondrial genome of trypanosomatids, consists of several thousand topologically interlocked DNA circles. Mitochondrial histone H1-like proteins were implicated in the condensation of kDNA into a nucleoid structure in the mitochondrial matrix. However, the mechanism that remodels kDNA, promoting its accessibility to the replication machinery, has not yet been described. Analyses, using yeast two hybrid system, co-immunoprecipitation, and protein-protein cross-linking, revealed specific protein-protein interactions between the kDNA replication initiator protein universal minicircle sequence-binding protein (UMSBP) and two mitochondrial histone H1-like proteins. Fluorescence and electron microscopy, as well as biochemical analyses, demonstrated that these protein-protein interactions result in the decondensation of kDNA. UMSBP-mediated decondensation rendered the kDNA network accessible to topological decatenation by topoisomerase II, yielding free kDNA minicircle monomers. Hence, UMSBP has the potential capacity to function in vivo in the activation of the prereplication release of minicircles from the network, a key step in kDNA replication, which precedes and enables its replication initiation. These observations demonstrate the prereplication remodeling of a condensed mitochondrial DNA, which is mediated via specific interactions of histone-like proteins with a replication initiator, rather than through their posttranslational covalent modifications. |
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| 6. | Methods Mol Biol. 2011;790:239-59.Generation of anti-infectome/anti-proteome nanobodies.Hassanzadeh-Ghassabeh G, Saerens D, Muyldermans S.SourceDepartment of Molecular and Cellular Interactions, VIB, Brussels, Belgium. ghassanz@vub.ac.be AbstractThe immunization of an animal with a whole proteome or the infection of an animal and the screening of the resulting antibody repertoire on either the same or different proteome(s) or the infecting agent(s), omits the laborious steps of recombinant protein expression and purification to obtain multiple antigen binders. This procedure allows the identification of antibodies that are specific to unique or common signatures of different proteomes without prior knowledge of these signatures.Nanobodies are the smallest (15 kDa, 2.2 nm diameter, 4 nm height) in vivo affinity-matured functional antigen-binding entities that are derived from camelid heavy-chain antibodies. Due to their small size, recognition of unique epitopes, high affinity, and easy tailoring, nanobodies are attractive affinity reagents for various applications, including diagnosis and therapy.We detail a protocol to generate, isolate, express, and purify anti-infectome/anti-proteome nanobodies. |
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