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1.
Sci Rep ; 12(1): 11913, 2022 07 13.
Artigo em Inglês | MEDLINE | ID: mdl-35831431

RESUMO

In the face of the current global extinction crisis, it is critical we give conservation management strategies the best chance of success. Australia is not exempt from global trends with currently the world's greatest mammal extinction rate (~ 1 per 8 years). Many more are threatened including the dibbler (Parantechinus apicalis) whose remnant range has been restricted to Western Australia at just one mainland site and two small offshore islands-Whitlock Island (5 ha) and Boullanger Island (35 ha). Here, we used 14 microsatellite markers to quantify genetic variation in the remaining island populations from 2013 to 2018 and incorporated these data into population viability analysis (PVA) models, used to assess factors important to dibbler survival and to provide guidance for translocations. Remnant population genetic diversity was low (< 0.3), and populations were highly divergent from each other (pairwise FSTs 0.29-0.52). Comparison of empirical data to an earlier study is consistent with recent declines in genetic diversity and models projected increasing extinction risk and declining genetic variation in the next century. Optimal translocation scenarios recommend 80 founders for new dibbler populations-provided by captive breeding-and determined the proportion of founders from parental populations to maximise genetic diversity and minimise harvesting impact. The goal of our approach is long-term survival of genetically diverse, self-sustaining populations and our methods are transferable. We consider mixing island with mainland dibblers to reinforce genetic variation.


Assuntos
Variação Genética , Marsupiais , Animais , Austrália , Conservação dos Recursos Naturais , Marsupiais/genética , Repetições de Microssatélites/genética , Austrália Ocidental
2.
PLoS One ; 14(12): e0225822, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31851687

RESUMO

The order Piroplasmida encompasses two main families: Babesiidae and Theileriidae, containing tick-borne pathogens of veterinary and medical importance worldwide. While only three genera (Babesia, Cytauxzoon and Theileria) comprising piroplasm parasites are currently recognised, phylogenetic studies at the 18S rRNA (18S) gene suggest that these organisms represent at least ten lineages, one of which comprises the relatively unique and highly diverse Theileria spp. from Australian marsupials and ticks. As an alternative to analysing 18S sequences alone, sequencing of mitochondrial genes has proven to be useful for the elucidation of evolutionary relationships amongst some groups of piroplasms. This research aimed to characterise piroplasms from Australian native mammals and ticks using multiple genetic markers (18S, cytochrome c, oxidase subunit III (cox3) and cytochrome B (cytB)) and microscopy. For this, nearly complete piroplasm-18S sequences were obtained from 32 animals belonging to six marsupial species: eastern bettong (Bettongia gaimardi), eastern quoll (Dasyurus viverrinus), eastern grey kangaroo (Macropus giganteus), swamp wallaby (Wallabia bicolor), quokka (Setonix brachyurus) and Gilbert's potoroo (Potorous gilbertii). The organisms detected represented eight novel Theileria genotypes, which formed five sub-clades within the main marsupial clade containing previously reported Australian marsupial and tick-derived Theileria spp. A selection of both novel and previously described Australian piroplasms at the 18S were also successfully characterised, for the first time, at the cox3 and cytB loci, and corroborated the position of Australian native theilerias in a separate, well-supported clade. Analyses of the cox3 and cytB genes also aided in the taxonomic resolution within the clade of Australian Piroplasmida. Importantly, microscopy and molecular analysis at multiple loci led to the discovery of a unique piroplasm species that clustered with the Australian marsupial theilerias, for which we propose the name Theileria lupei n. sp.


Assuntos
Marsupiais/parasitologia , Mitocôndrias/genética , RNA Ribossômico 18S/genética , Theileria , Theileriose/parasitologia , Carrapatos/parasitologia , Animais , Austrália , DNA de Protozoário/genética , Loci Gênicos , Filogenia , RNA de Protozoário/genética , Theileria/classificação , Theileria/genética , Theileria/isolamento & purificação
3.
Aust Vet J ; 95(7): 250-258, 2017 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-28653383

RESUMO

CASE REPORT: Six Gilbert's potoroos (Potorous gilbertii) in a captive colony, five of which were closely related, died or were euthanased with severe renal disease. Clinical signs were mostly non-specific. Renal calculi were seen on ultrasound of two affected potoroos and oxalate crystalluria was seen in two of three affected potoroos that had urine samples examined. Necropsies revealed extensive severe renal oxalosis in all affected potoroos. These findings and markedly increased concentrations of glycolate in the urine of the four affected potoroos for which it was measured, confirmed a disorder of oxalate metabolism and suggested a condition similar to primary hyperoxaluria type 1 in humans. Liver alanine : glyoxylate aminotransferase activity and intracellular location were assessed as normal in one affected potoroo, which is inconsistent with human primary hyperoxaluria type 1. Although a condition similar to human primary hyperoxaluria type 2 or 3 was not ruled out, other clinicopathological findings were not consistent with those seen in humans with these conditions. A lack of faecal oxalate-degrading activity was observed in two affected potoroos in which it was measured, whereas oxalate-degrading activity was variably present in healthy captive and wild potoroos. CONCLUSION: Although the pathogenesis of renal oxalosis in these cases was not clear, the biochemical findings of elevated urinary oxalate and glycolate excretion indicate an abnormality of oxalate metabolism. The familial pattern of disease suggests it could be an inherited condition.


Assuntos
Hiperoxalúria/veterinária , Oxalatos/metabolismo , Potoroidae , Animais , Fezes/química , Feminino , Humanos , Hiperoxalúria/diagnóstico , Hiperoxalúria Primária , Rim , Masculino
4.
Ann Oncol ; 28(8): 1949-1956, 2017 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-28472437

RESUMO

BACKGROUND: Cancer anorexia-cachexia is a debilitating condition frequently observed in NSCLC patients, characterized by decreased body weight, reduced food intake, and impaired quality of life. Anamorelin, a novel selective ghrelin receptor agonist, has anabolic and appetite-enhancing activities. PATIENTS AND METHODS: ROMANA 3 was a safety extension study of two phase 3, double-blind studies that assessed safety and efficacy of anamorelin in advanced NSCLC patients with cachexia. Patients with preserved Eastern Cooperative Oncology Group ≤2 after completing 12 weeks (w) on the ROMANA 1 or ROMANA 2 trials (0-12 weeks) could enroll in ROMANA 3 and continue to receive anamorelin 100 mg or placebo once daily for an additional 12w (12-24 weeks). The primary endpoint of ROMANA 3 was anamorelin safety/tolerability (12-24 weeks). Secondary endpoints included changes in body weight, handgrip strength (HGS), and symptom burden (0-24 weeks). RESULTS: Of the 703 patients who completed ROMANA 1 and ROMANA 2, 513 patients entered ROMANA 3 (anamorelin, N = 345, mean age 62.0 years; placebo, N = 168; mean age 62.2 years). During ROMANA 3, anamorelin and placebo groups had similar incidences of treatment-emergent adverse events (TEAEs; 52.2% versus 55.7%), grade ≥3 TEAEs (22.4% versus 21.6%), and serious TEAEs (12.8% versus 12.6%). There were 36 (10.5%) and 23 (13.8%) deaths in the anamorelin and placebo groups, respectively; none were drug-related. Improvements in body weight and anorexia-cachexia symptoms observed in the original trials were consistently maintained over 12-24 weeks. Anamorelin, versus placebo, significantly increased body weight from baseline of original trials at all time points (P < 0.0001) and improved anorexia-cachexia symptoms at weeks 3, 6, 9, 12, and 16 (P < 0.05). No significant improvement in HGS was seen in either group. CONCLUSION: During the 12-24 weeks ROMANA 3 trial, anamorelin continued to be well tolerated. Over the entire 0-24w treatment period, body weight and symptom burden were improved with anamorelin. CLINICAL TRIAL REGISTRATION NUMBERS: ROMANA 1 (NCT01387269), ROMANA 2 (NCT01387282), and ROMANA 3 (NCT01395914).


Assuntos
Caquexia/tratamento farmacológico , Carcinoma Pulmonar de Células não Pequenas/tratamento farmacológico , Hidrazinas/efeitos adversos , Neoplasias Pulmonares/tratamento farmacológico , Oligopeptídeos/efeitos adversos , Receptores de Grelina/agonistas , Idoso , Caquexia/etiologia , Carcinoma Pulmonar de Células não Pequenas/complicações , Carcinoma Pulmonar de Células não Pequenas/patologia , Método Duplo-Cego , Feminino , Humanos , Hidrazinas/uso terapêutico , Neoplasias Pulmonares/complicações , Neoplasias Pulmonares/patologia , Masculino , Pessoa de Meia-Idade , Oligopeptídeos/uso terapêutico , Placebos
5.
Exp Parasitol ; 153: 105-10, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25816975

RESUMO

Trypanosoma copemani is known to be infective to a variety of Australian marsupials. Characterisation of this parasite revealed the presence of stercorarian-like life-cycle stages in culture, which are similar to T. rangeli and T. cruzi. The blood incubation infectivity test (BIIT) was adapted and used to determine if T. copemani, like T. cruzi and T. rangeli, has the potential to grow in the presence of human serum. To eliminate any effects of anticoagulants on the complement system and on human high density lipoprotein (HDL), only fresh whole human blood was used. Trypanosoma copemani was observed by microscopy in all human blood cultures from day 5 to day 19 post inoculation (PI). The mechanism for normal human serum (NHS) resistance in T. copemani is not known. The results of this study show that at least one native Australian trypanosome species may have the potential to be infective for humans.


Assuntos
Macropodidae/parasitologia , Soro/parasitologia , Trypanosoma/crescimento & desenvolvimento , Tripanossomíase/parasitologia , Tripanossomíase/veterinária , Animais , Austrália , Humanos , Trypanosoma/imunologia , Trypanosoma/fisiologia , Tripanossomíase/imunologia
6.
Phys Rev Lett ; 113(21): 215503, 2014 Nov 21.
Artigo em Inglês | MEDLINE | ID: mdl-25479504

RESUMO

We theoretically and experimentally demonstrate the existence of complete surface acoustic wave band gaps in surface phonon-polariton phononic crystals, in a completely monolithic structure formed from a two-dimensional honeycomb array of hexagonal shape domain-inverted inclusions in single crystal piezoelectric Z-cut lithium niobate. The band gaps appear at a frequency of about twice the Bragg band gap at the center of the Brillouin zone, formed through phonon-polariton coupling. The structure is mechanically, electromagnetically, and topographically homogeneous, without any physical alteration of the surface, offering an ideal platform for many acoustic wave applications for photonics, phononics, and microfluidics.

7.
Exp Parasitol ; 138: 48-54, 2014 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-24508502

RESUMO

The identification and characterisation of novel Eimeria species has largely been based on sporulated oocyst and sporocyst morphology, the host species and the geographical range. Variation in the size and shape of Eimeria oocysts across their host range however, make the identification and characterisation of novel species using traditional methodologies alone problematic. The use of molecular markers and phylogenetic analysis has greatly advanced our ability to characterise Eimeria species and has recently been applied to understand evolutionary relationships among Eimeria species from Australian marsupials. In the present study, Eimeria species isolated from quokkas (Setonix brachyurus) captured from Two Peoples Bay, Bald Island and Rottnest Island, Western Australia, were morphologically identified as Eimeria quokka and Eimeria setonicis. Both Eimeria species were identified as being polymorphic in nature with regards to sporulated oocyst and sporocyst morphometrics. Phylogenetic analysis using 18S rRNA and COI (cytochrome c oxidase subunit 1) genes, grouped E. quokka and E. setonicis within the Eimeria marsupial clade together with Eimeria trichosuri from brushtail possums, Eimeria macropodis from tammar wallabies (Macropus eugenii) and several unidentified macropod Eimeria species from western grey kangaroos (Macropus fuliginosus). This study is the first to characterise E. quokka and E. setonicis by molecular analysis, enabling more extensive resolution of evolutionary relationships among marsupial-derived Eimeria species.


Assuntos
Coccidiose/veterinária , Eimeria/isolamento & purificação , Macropodidae/parasitologia , Animais , Sequência de Bases , Coccidiose/epidemiologia , Coccidiose/parasitologia , DNA de Protozoário/química , DNA de Protozoário/isolamento & purificação , Eimeria/classificação , Eimeria/genética , Eimeria/ultraestrutura , Complexo IV da Cadeia de Transporte de Elétrons/genética , Evolução Molecular , Fezes/parasitologia , Microscopia de Interferência/veterinária , Dados de Sequência Molecular , Oocistos/classificação , Oocistos/ultraestrutura , Filogenia , Reação em Cadeia da Polimerase/veterinária , Prevalência , RNA Ribossômico 18S/genética , Austrália Ocidental/epidemiologia
8.
J Zoo Wildl Med ; 44(1): 208-11, 2013 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-23505731

RESUMO

An adult, female numbat (Myrmecobius fasciatus) was submitted to the Perth Zoo Veterinary Department for postmortem examination in November 2011. This radio-collared wild numbat had been found dead in the Dryandra Woodland, 191 km southeast of Perth, Western Australia. On external examination, the body condition was good. Three ticks (Ixodes spp.) were found on the thoracic region. The external pouch was contaminated with dirt and palpably flocculent, and the nipples oozed a purulent material. Histopathology showed widespread fibrin thrombi containing bacterial microcolonies within interstitial vessels of the mammary gland with surrounding necrotic tissue. Bacterial microcolonies were present throughout the kidney, intestine, lung, and mammary tissue, and culture produced a moderate growth of Erysipelothrix rhusiopathiae. Although erysipelas has been reported as a cause of morbidity and mortality in marsupials, this is the first report of erysipelas in the order Dasyuromorphia (marsupial carnivores) and highlights the need for ongoing surveillance for causes of disease in wild numbats and species recovery programs.


Assuntos
Infecções por Erysipelothrix/patologia , Erysipelothrix/isolamento & purificação , Marsupiais , Animais , Animais Selvagens , Feminino
9.
PLoS One ; 8(1): e55509, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-23383209

RESUMO

Despite advances in cancer detection and prevention, a diagnosis of metastatic disease remains a death sentence due to the fact that many cancers are either resistant to chemotherapy (conventional or targeted) or develop resistance during treatment, and residual chemoresistant cells are highly metastatic. Metastatic cancer cells resist the effects of chemotherapeutic agents by upregulating drug transporters, which efflux the drugs, and by activating proliferation and survival signaling pathways. Previously, we found that c-Abl and Arg non-receptor tyrosine kinases are activated in breast cancer, melanoma, and glioblastoma cells, and promote cancer progression. In this report, we demonstrate that the c-Abl/Arg inhibitor, imatinib (imatinib mesylate, STI571, Gleevec), reverses intrinsic and acquired resistance to the anthracycline, doxorubicin, by inducing G2/M arrest and promoting apoptosis in cancer cells expressing highly active c-Abl and Arg. Significantly, imatinib prevents intrinsic resistance by promoting doxorubicin-mediated NF-κB/p65 nuclear localization and repression of NF-κB targets in a STAT3-dependent manner, and by preventing activation of a novel STAT3/HSP27/p38/Akt survival pathway. In contrast, imatinib prevents acquired resistance by inhibiting upregulation of the ABC drug transporter, ABCB1, directly inhibiting ABCB1 function, and abrogating survival signaling. Thus, imatinib inhibits multiple novel chemoresistance pathways, which indicates that it may be effective in reversing intrinsic and acquired resistance in cancers containing highly active c-Abl and Arg, a critical step in effectively treating metastatic disease. Furthermore, since imatinib converts a master survival regulator, NF-κB, from a pro-survival into a pro-apoptotic factor, our data suggest that NF-κB inhibitors may be ineffective in sensitizing tumors containing activated c-Abl/Arg to anthracyclines, and instead might antagonize anthracycline-induced apoptosis.


Assuntos
Antineoplásicos/farmacologia , Resistencia a Medicamentos Antineoplásicos , Proteínas de Choque Térmico HSP27/metabolismo , NF-kappa B/metabolismo , Proteínas Proto-Oncogênicas c-akt/metabolismo , Fator de Transcrição STAT3/metabolismo , Transdução de Sinais/efeitos dos fármacos , Proteínas Quinases p38 Ativadas por Mitógeno/metabolismo , Subfamília B de Transportador de Cassetes de Ligação de ATP , Membro 1 da Subfamília B de Cassetes de Ligação de ATP/antagonistas & inibidores , Membro 1 da Subfamília B de Cassetes de Ligação de ATP/genética , Apoptose/efeitos dos fármacos , Benzamidas/farmacologia , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Sobrevivência Celular/genética , Doxorrubicina/farmacologia , Resistencia a Medicamentos Antineoplásicos/genética , Pontos de Checagem da Fase G2 do Ciclo Celular/efeitos dos fármacos , Regulação Neoplásica da Expressão Gênica , Humanos , Mesilato de Imatinib , Pontos de Checagem da Fase M do Ciclo Celular/efeitos dos fármacos , Modelos Biológicos , Piperazinas/farmacologia , Transporte Proteico , Proteínas Proto-Oncogênicas c-abl/genética , Proteínas Proto-Oncogênicas c-abl/metabolismo , Pirimidinas/farmacologia
10.
Oncogene ; 31(14): 1804-16, 2012 Apr 05.
Artigo em Inglês | MEDLINE | ID: mdl-21892207

RESUMO

Despite 35 years of clinical trials, there is little improvement in 1-year survival rates for patients with metastatic melanoma, and the disease is essentially untreatable if not cured surgically. The paucity of chemotherapeutic agents that are effective for treating metastatic melanoma indicates a dire need to develop new therapies. Here, we found a previously unrecognized role for c-Abl and Arg in melanoma progression. We demonstrate that the kinase activities of c-Abl and Arg are elevated in primary melanomas (60%), in a subset of benign nevi (33%) and in some human melanoma cell lines. Using siRNA and pharmacological approaches, we show that c-Abl/Arg activation is functionally relevant because it is requiredfor melanoma cell proliferation, survival and invasion. Significantly, we identify the mechanism by which activated c-Abl promotes melanoma invasion by showing that it transcriptionally upregulates matrix metalloproteinase-1 (MMP-1), and using rescue approaches we demonstrate that c-Abl promotes invasion through a STAT3 → MMP-1 pathway. Additionally, we show that c-Abl and Arg are not merely redundant, as active Arg drives invasion in a STAT3-independent manner, and upregulates MMP-3 and MT1-MMP, in addition to MMP-1. Most importantly, c-Abl and Arg not only promote in vitro processes important for melanoma progression, but also promote metastasis in vivo, as inhibition of c-Abl/Arg kinase activity with the c-Abl/Arg inhibitor, nilotinib, dramatically inhibits metastasis in a mouse model. Taken together, these data identify c-Abl and Arg as critical, novel, drug targets in metastatic melanoma, and indicate that nilotinib may be useful in preventing metastasis in patients with melanomas harboring active c-Abl and Arg.


Assuntos
Melanoma/metabolismo , Proteínas Tirosina Quinases/metabolismo , Proteínas Proto-Oncogênicas c-abl/metabolismo , Neoplasias Cutâneas/metabolismo , Animais , Progressão da Doença , Humanos , Metaloproteinase 1 da Matriz/metabolismo , Melanoma/patologia , Melanoma/secundário , Camundongos , Invasividade Neoplásica , Proteínas Tirosina Quinases/farmacologia , Pirimidinas/farmacologia , Fator de Transcrição STAT3/metabolismo , Transdução de Sinais , Neoplasias Cutâneas/patologia
11.
J Wildl Dis ; 47(4): 1019-25, 2011 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-22102677

RESUMO

The Gilbert's potoroo (Potorous gilbertii) is one of Australia's most critically endangered mammals with a current estimated population of 70 individuals. Both the wild and captive populations have a long history of balanoposthitis with associated crusting, ulceration, and preputial discharge. We sought to identify the microbial species found in the discharge, determine their significance in causing balanoposthitis, and correlate these findings with reproductive success and survivorship. Bacteriologic examination revealed the discharge to be a polymicrobial infection involving Treponema spp., Actinobacillus spp., and Pasteurella spp. Preputial histopathology reported a moderate, chronic, erosive inflammatory response with diffuse, moderate to marked secondary epithelial hyperplasia in conjunction with moderate numbers of spirochetes, suggesting a causative relationship. Clinical examination, preputial biopsies, and serologic screening found no evidence of associated systemic disease. The clinical investigation of Treponema is significant with respect to the overall recovery of Gilbert's potoroo, given the clinical and histopathologic similarities to Treponema paraluis-cuniculi found in rabbits, causing dyspareunia, and the severity of the associated balanoposthitis.


Assuntos
Balanite (Inflamação)/veterinária , Potoroidae , Infecções por Treponema/veterinária , Descarga Vaginal/veterinária , Animais , Animais Selvagens , Balanite (Inflamação)/epidemiologia , Balanite (Inflamação)/microbiologia , Dispareunia , Espécies em Perigo de Extinção , Feminino , Masculino , Treponema , Infecções por Treponema/epidemiologia , Infecções por Treponema/microbiologia , Descarga Vaginal/epidemiologia , Descarga Vaginal/microbiologia
12.
Parasitology ; 138(7): 866-72, 2011 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-21518469

RESUMO

A total of 41 ticks were collected from 15 quokkas on Bald Island and 2 ticks from a Gilbert's potoroo from Two Peoples Bay. Three species of Ixodid ticks Ixodes australiensis, Ixodes hirsti and Ixodes myrmecobii were identified on the quokkas known to have a high prevalence of Trypanosoma copemani. Tick faeces from ticks isolated from 8 individual quokkas and a Gilbert's potoroo were examined with one identified as positive for trypanosomes. Faecal examination revealed trypanosomes similar to in vitro life-cycle stages of T. copemani. In total 12 ticks were dissected and trypanosomes found in sections of their midgut and haemolymph, 49 and 117 days after collection. Tick faeces, salivary glands and midguts from I. australiensis were screened using an 18S rRNA PCR with amplification seen only from the midguts. Sequencing showed 100% homology to T. copemani (genotype A) and 99.9% homology to the wombat (AII) isolate of T. copemani. Trypanosomes were only detected in I. australiensis as neither I. hirsti nor I. myrmecobii survived the initial 30-day storage conditions. We therefore identify a vector for T. copemani as I. australiensis and, given the detection of trypanosomes in the faeces, suggest that transmission is via the faecal-oral route.


Assuntos
Ixodes/parasitologia , Trypanosoma/fisiologia , Tripanossomíase/veterinária , Animais , Vetores Aracnídeos/parasitologia , Sangue/parasitologia , Fezes/parasitologia , Macropodidae/parasitologia , Potoroidae/parasitologia , RNA Ribossômico 18S/genética , Trypanosoma/citologia , Trypanosoma/genética , Tripanossomíase/transmissão
13.
J Eukaryot Microbiol ; 56(3): 290-5, 2009.
Artigo em Inglês | MEDLINE | ID: mdl-19527357

RESUMO

The morphology and genetic characterisation of a new species of piroplasm identified in the blood of the Gilbert's potoroo (Potorous gilbertii) from the Two Peoples Bay Nature Reserve near Albany, Western Australia, is described from blood and tissue samples from 16 Gilbert's potoroos. Microscopy of blood showed these parasites are highly pleomorphic with a mean length of 1.8 mum and mean width of 0.85 mum. Phylogenetic analysis of 18S rRNA sequence data identified the piroplasm as a new species of Theileria that is closely related to other Australian marsupial piroplasm species. Based on biological and molecular data, it is proposed that the parasite from Gilbert's potoroo be given the name Theileria gilberti n. sp.


Assuntos
Potoroidae/parasitologia , Theileria/classificação , Theileria/isolamento & purificação , Animais , Sangue/parasitologia , Análise por Conglomerados , DNA de Protozoário/química , DNA de Protozoário/genética , DNA Ribossômico/química , DNA Ribossômico/genética , Genes de RNAr , Microscopia/métodos , Dados de Sequência Molecular , Filogenia , RNA de Protozoário/genética , RNA Ribossômico 18S/genética , Análise de Sequência de DNA , Theileria/citologia , Austrália Ocidental
14.
Parasitology ; 136(7): 783-92, 2009 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-19416553

RESUMO

Little is known of the prevalence and life-cycle of trypanosomes in mammals native to Australia. Native Australian trypanosomes have previously been identified in marsupials in the eastern states of Australia, with one recent report in brush-tailed bettongs (Bettongia penicillata), or woylie in Western Australia in 2008. This study reports a novel Trypanosoma sp. identified in blood smears, from 7 critically endangered Gilbert's potoroos (Potorous gilbertii) and 3 quokkas (Setonix brachyurus) in Western Australia. Trypanosomes were successfully cultured in vitro and showed morphological characteristics similar to members of the subgenus Herpetosoma. Phylogenetic analysis of 18S rRNA gene sequences identified 2 different novel genotypes A and B that are closely related to trypanosomes previously isolated from a common wombat (Vombatus ursinus) in Victoria, Australia. The new species is proposed to be named Trypanosoma copemani n. sp.


Assuntos
Animais Selvagens/parasitologia , Macropodidae/parasitologia , Potoroidae/parasitologia , Trypanosoma/classificação , Tripanossomíase/veterinária , Animais , DNA de Protozoário/análise , DNA de Protozoário/isolamento & purificação , Dados de Sequência Molecular , Filogenia , Reação em Cadeia da Polimerase/métodos , RNA Ribossômico 18S/genética , Análise de Sequência de DNA , Especificidade da Espécie , Trypanosoma/genética , Trypanosoma/isolamento & purificação , Trypanosoma/ultraestrutura , Tripanossomíase/parasitologia
15.
Clin Exp Immunol ; 155(3): 447-56, 2009 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-19094118

RESUMO

Granulocyte-colony stimulating factor (G-CSF) has proved to be a successful therapy for some patients with Crohn's disease. Given the known ability of G-CSF to exert anti-T helper 1 effects and to induce interleukin (IL)-10-secreting regulatory T cells, we studied whether clinical benefit from G-CSF therapy in active Crohn's disease was associated with decreased inflammatory cytokine production and/or increased regulatory responses. Crohn's patients were treated with G-CSF (5 microg/kg/day subcutaneously) for 4 weeks and changes in cell phenotype, cytokine production and dendritic cell subsets were measured in the peripheral blood and colonic mucosal biopsies using flow cytometry, enzyme-linked immunosorbent assay and immunocytochemistry. Crohn's patients who achieved a clinical response or remission based on the decrease in the Crohn's disease activity index differed from non-responding patients in several important ways: at the end of treatment, responding patients had significantly more CD4(+) memory T cells producing IL-10 in the peripheral blood; they also had a greatly enhanced CD123(+) plasmacytoid dendritic cell infiltration of the lamina propria. Interferon-gamma production capacity was not changed significantly except in non-responders, where it increased. These data show that clinical benefit from G-CSF treatment in Crohn's disease is accompanied by significant induction of IL-10 secreting T cells as well as increases in plasmacytoid dendritic cells in the lamina propria of the inflamed gut mucosa.


Assuntos
Doença de Crohn/tratamento farmacológico , Células Dendríticas/imunologia , Fator Estimulador de Colônias de Granulócitos/uso terapêutico , Interleucina-10/imunologia , Linfócitos T Reguladores/imunologia , Adulto , Doença de Crohn/imunologia , Citocinas/imunologia , Esquema de Medicação , Feminino , Humanos , Imuno-Histoquímica , Imunofenotipagem , Ativação Linfocitária/imunologia , Masculino , Mucosa/imunologia , Projetos Piloto , Proteínas Recombinantes , Estatísticas não Paramétricas , Resultado do Tratamento , Adulto Jovem
16.
Vet Pathol ; 45(1): 95-103, 2008 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-18192585

RESUMO

A progressive wart-like syndrome in both captive and wild populations of the Western barred bandicoot (WBB) is hindering conservation efforts to prevent the extinction of this endangered marsupial. In this study, 42 WBBs exhibiting the papillomatosis and carcinomatosis syndrome were examined. The disease was characterized by multicentric proliferative lesions involving cutaneous and mucosal surfaces, which were seen clinically to increase in size with time. Grossly and histologically the smaller skin lesions resembled papillomas, whereas the larger lesions were most commonly observed to be squamous cell carcinomas. Large amphophilic intranuclear inclusion bodies were observed in hyperplastic conjunctival lesions of 8 WBBs under light microscopy. Conjunctival lesions from 2 WBBs examined using transmission electron microscopy contained a crystalline array of spherical electron-dense particles of 45-nm diameter, within the nucleus of conjunctival epithelial cells, consistent with a papillomavirus or polyomavirus. Conjunctival samples from 3 bandicoots that contained intranuclear inclusion bodies also demonstrated a positive immunohistochemical reaction after indirect immunohistochemistry for papillomavirus structural antigens. Ultrastructural and/or immunohistochemical evidence of an etiologic agent was not identified in the nonconjunctival lesions examined. Here we describe the gross, histopathologic, ultrastructural, and immunohistochemical findings of a papillomatosis and carcinomatosis syndrome recently identified in the WBB.


Assuntos
Carcinoma/veterinária , Marsupiais , Papiloma/veterinária , Animais , Carcinoma/patologia , Feminino , Masculino , Papiloma/patologia
17.
J Parasitol ; 93(1): 89-92, 2007 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-17436946

RESUMO

Previous studies have described a range of Klossiella species parasitic in marsupial hosts. Klossiella quimrensis is the etiologic agent of renal coccidiosis in the peramelid marsupial hosts Isoodon obesulus and Perameles gunnii in Eastern Australia, but there is no previous report of klossiellosis in Western Australian peramelids. This study describes klossiellosis diagnosed by histology of renal tissue sections collected during necropsy of 20 Perameles bougainville between 2000 and 2005. Sporonts, sporoblasts, and macrogametes were identified within parasitophorous vacuoles of epithelial cells located near the renal corticomedullary junction. The prevalence of renal coccidiosis in P. bougainville diagnosed by renal histology is estimated at 30%. Only a single unsporulated sporocyst was detected by examination of cystocentesis-collected urine, indicating that microscopic evaluation of urine samples is an insensitive diagnostic test for detection of K. quimrensis in P. bougainville. This infection in P. bougainville is indirectly associated with mild multifocal interstitial lymphohistiocytic nephritis and is likely to be only minimally pathogenic in otherwise healthy individuals. Our study also extends the host and geographic range of K. quimrensis to include P. bougainville and Western Australia.


Assuntos
Coccídios/fisiologia , Coccidiose/veterinária , Nefropatias/veterinária , Marsupiais/parasitologia , Animais , Coccídios/crescimento & desenvolvimento , Coccídios/ultraestrutura , Coccidiose/epidemiologia , Coccidiose/parasitologia , Rim/parasitologia , Rim/patologia , Nefropatias/epidemiologia , Nefropatias/parasitologia , Estágios do Ciclo de Vida/fisiologia , Prevalência , Vacúolos/parasitologia , Austrália Ocidental/epidemiologia
18.
J Zoo Wildl Med ; 38(4): 567-73, 2007 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-18229862

RESUMO

Two cases of fatal cryptococcosis are described, one of Cryptococcus neoformans infection in a Gilbert's potoroo (Potorous gilbertii) and one of Cryptococcus gattii infection in a long-nosed potoroo (Potorous tridactylus). The diagnoses were confirmed by culture and specific immunohistochemistry, respectively. The long-nosed potoroo tested positive using the latex cryptococcal antigen test (LCAT), whereas the Gilbert's potoroo had a negative LCAT result despite having advanced disease of some duration. In both cases, the clinical presentation was a progressive neurologic disease associated with a central nervous system infection. Pulmonary infection was also observed in the long-nosed potoroo. Specific treatment with antifungal agents was unsuccessful in the long-nosed potoroo.


Assuntos
Antifúngicos/uso terapêutico , Criptococose/veterinária , Itraconazol/uso terapêutico , Potoroidae/parasitologia , Animais , Criptococose/tratamento farmacológico , Criptococose/epidemiologia , Criptococose/patologia , Cryptococcus neoformans/efeitos dos fármacos , Cryptococcus neoformans/isolamento & purificação , Evolução Fatal , Feminino , Imuno-Histoquímica/veterinária , Masculino
19.
Aust Vet J ; 81(12): 739-41, 2003 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-15080483

RESUMO

Cryptosporidiosis is an enteric disease of animals and humans that can be fatal in immunocompromised individuals. There is no known effective treatment for cryptosporidiosis. Bilbies are threatened marsupials and are bred in captivity as part of a recovery program to re-introduce this species to the southwest of Western Australia. Cryptosporidium muris infection was detected in the faeces of bilbies at a captive breeding colony. Stress associated with a high density of bilbies in enclosures may have predisposed some of the bilbies to infection with C. muris. C. muris has been described in mice and was found in the faeces of one mouse trapped in the breeding enclosures. It is likely the bilbies acquired the infection from mice by faecal contamination of food and water. The infection cleared within 2 months from some bilbies, however others remained infected for 6 months and treatment was attempted with dimetridazole. Subsequently the parasite was no longer be detectable in the faeces.


Assuntos
Criptosporidiose/epidemiologia , Cryptosporidium/isolamento & purificação , Surtos de Doenças/veterinária , Marsupiais , Animais , Animais de Zoológico , Antiprotozoários/administração & dosagem , Antiprotozoários/uso terapêutico , Criptosporidiose/tratamento farmacológico , Criptosporidiose/etiologia , Dimetridazol/administração & dosagem , Dimetridazol/uso terapêutico , Fezes/parasitologia , Feminino , Masculino , Camundongos/parasitologia , Austrália Ocidental/epidemiologia
20.
Thorax ; 57(10): 869-74, 2002 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-12324673

RESUMO

BACKGROUND: There is still debate over the benefit of self-management programmes for adults with asthma. A brief self-management programme given during a hospital admission for acute asthma was tested to determine whether it would reduce readmission. METHOD: A randomised controlled trial was performed in 280 adult patients with acute asthma admitted over 29 months. Patients on the self-management programme (SMP) received 40-60 minutes of education supporting a written self-management plan. Control patients received standard care (SC). RESULTS: One month after discharge SMP patients were more likely than SC patients to report no daytime wheeze (OR 2.6, 95% CI 1.5 to 5.3), no night disturbance (OR 2.0, 95% CI 1.2 to 3.5), and no activity limitation (OR 1.5, 95% CI 0.9 to 2.7). Over 12 months 17% of SMP patients were re-admitted compared with 27% of SC patients (OR 0.5, 95% CI 0.3 to 1.0). Among first admission patients, OR readmission (SMP v SC) was 0.2 (95% CI 0.1 to 0.7), p<0.01. For patients with a previous admission, OR readmission was 0.8 (95% CI 0.4 to 1.6), p=0.6. SMP patients were more likely than SC patients to be prescribed inhaled steroids at discharge (99% v 92%, p=0.03), oral steroids (98% v 90%, p=0.06), and to have hospital follow up (98% v 84%, p<0.01) but adjustment for these differences did not diminish the effect of the self-management programme. CONCLUSIONS: A brief self-management programme during hospital admission reduced post discharge morbidity and readmission for adult asthma patients. The benefit of the programme may have been greater for patients admitted for the first time. The programme also had a small but significant effect on medical management at discharge.


Assuntos
Asma/terapia , Autocuidado/métodos , Doença Aguda , Adolescente , Adulto , Asma/fisiopatologia , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Readmissão do Paciente , Satisfação do Paciente , Pico do Fluxo Expiratório/fisiologia , Recidiva , Fatores de Risco , Inquéritos e Questionários , Resultado do Tratamento
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