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排序方式: 共有452条查询结果,搜索用时 15 毫秒
1.
da Cunha JP Nakayasu ES Elias MC Pimenta DC Téllez-Iñón MT Rojas F Muñoz MJ Manuel M Almeida IC Schenkman S 《Molecular and biochemical parasitology》2005,140(1):75-86
Histone H1 of most eukaryotes is phosphorylated during the cell cycle progression and seems to play a role in the regulation of chromatin structure, affecting replication and chromosome condensation. In trypanosomatids, histone H1 lacks the globular domain and is shorter when compared with the histone of other eukaryotes. We have previously shown that in Trypanosoma cruzi, the agent of Chagas' disease, histone H1 is phosphorylated and this increases its dissociation from chromatin. Here, we demonstrate using mass spectrometry analysis that T. cruzi histone H1 is only phosphorylated at the serine 12 in the sequence SPKK, a typical cyclin-dependent kinase site. We also found a correlation between the phosphorylation state of histone H1 and the cell cycle. Hydroxyurea and lactacystin, which, respectively, arrest parasites at the G1/S and G2/M stages of the cell cycle, increased the level of histone H1 phosphorylation. Cyclin-dependent kinase-related enzymes TzCRK3, and less intensely the TzCRK1 were able to phosphorylate histone H1 in vitro. Histone H1 dephosphorylation was prevented by treating the parasites with okadaic acid but not with calyculin A. These findings suggest that T. cruzi histone H1 phosphorylation is promoted by cyclin dependent kinases, present during S through G2 phase of the cell cycle, and its dephosphorylation is promoted by specific phosphatases. 相似文献
2.
Thalidomide, clinically used as an antiinflammatory and antitumoral drug, inhibited sponge-induced angiogenesis when administered systemically (100 mg/kg–1) in mice. However, it failed to inhibit solid Ehrlich tumor in the same mouse strain. We have used functional, biochemical and histological parameters to assess neovascularization and fibrovascular tissue infiltration of the mice sponge granuloma. The neovascularization growth as detected by development of blood flow and hemoglobin content extracted from the implants showed that thalidomide inhibited fibrovascular tissue formation by 40%. The functional and biochemical parameters correlated well with the histological study. Thalidomide had no inhibitory effect in the development of Ehrlich tumor. The detection of this selective action using the same animal strain bearing two different processes, supports the hypothesis that rather than species specificity, thalidomide is tissue specific. This approach may be used to identify the specificity of other therapeutic agents against distinct angiogenesis-dependent diseases. 相似文献
3.
Salvador Vilar Correia Lima Humberto Montoro Chagas Caio Cesar Paes Monteiro Rafaela Siqueira Ferraz-Carvalho Amanda Vasconcelos Albuquerque Anderson Arnaldo Silva Mariana Montenegro de Melo Lira Fbio Oliveira Vilar 《Translational andrology and urology》2021,10(2):841
BackgroundPenile prostheses are the third option in the treatment of erectile dysfunction, however, despite their proven effectiveness, the occurrence of infections, advanced age of patients and comorbidities are the main limiting factors for this treatment modality. In the continuous search for biointegrated, clinically durable and minimally invasive treatment options, a possible model of penile prosthesis was sought through the use of intracavernous bacterial cellulose (BC) gel, in an experimental model of orchiectomized rabbits.MethodsThirty adult New Zealand rabbits were equally distributed into three groups: BC; vehicle and control. Each group was then subdivided according to the follow-up time of 3 and 6 months. Bilateral orchiectomy was performed 3 weeks before injection in the BC and vehicle groups. Pachymetry measurements of the penile axis, diameter and length were performed in situ. Histomorphometry analyzes of the corpora cavernosa (CC), thickness of the tunica albuginea, cell density, collagen and elastic fibers post-injection were also performed, in addition to immunohistochemistry for newly formed vessels.ResultsThe implant of BC increased both the length and thickness of the penis three and six months after the last injection, with a consequent increase in the diameter of the CC. On the other hand, the filling effect was not observed in the control and vehicle groups, confirming the degradation of this tissue after orchiectomy and the effectiveness of BC as a filling agent. Histomorphometry analyzes corroborate the mass effect of BC integrated into the tissue, permeated by predominantly lymphomononuclear inflammatory infiltrate, multinucleated giant foreign body cells, fibroblasts, elastic fibers and newly formed vessels, without degradation or loss of volume, even after six months of implantation.ConclusionsBiocompatibility and biointegration to the host tissue make BC a prosperous penile filling material, with local application and minimally invasive. 相似文献
4.
Oliva ML Mendes CR Juliano MA Chagas JR Rosa JC Greene LJ Sampaio MU Sampaio CA 《Immunopharmacology》1999,45(1-3):163-169
Trypsin inhibitors were purified from a saline extract of Bauhinia bauhinioides seeds by ion-exchange column chromatography on DEAE-Sephadex, gel filtration on Superose 12 column, Mono Q ion-exchange chromatography or, alternatively, by affinity chromatography on trypsin-Sepharose. Both B. bauhinioides isolated inhibitors, BbTI-I and BbTI-II, inhibit trypsin being the dissociation constant 0.6 and 0.36 nM, respectively. BbTI-II only inhibits porcine pancreatic kallikrein hydrolysis of H-Pro-Phe-Arg-AMC (Ki 2.0 nM); the bradykinin-containing sequence LGMISLMKRPPGFSPFRSSRI-NH2 and the two kininogen related flanking quenched substrates Abz-MISLMKRP-EDDnp (Ki 2.0 nM) and Abz-FRSSRQ-EDDnp (Ki 2.5 nM). 相似文献
5.
Cristiane Barbosa Chagas Cláudia Saunders Silvia Pereira Jacqueline Silva Carlos Saboya Andréa Ramalho 《Obesity surgery》2013,23(2):249-254
This study aims to describe the clinical consequences of vitamin A deficiency (VAD) in pregnant women after bariatric surgery. Included are studies on VAD during pregnancy and after bariatric surgery conducted in humans from 1993 to 2011. There are few investigations on the relationship between pregnancy and bariatric surgery and on the damage to the binomial mother–child resulting from VAD in this relationship. The high percentage of VAD in the postoperative period is a cause for concern, especially considering the function of this vitamin in certain biological moments and in moments of intense nutritional demand. This vitamin serum evaluation is recommended during the prenatal period. 相似文献
6.
C.L. Sonego M.A.R. Scheffer O.L. Chagas Júnior B.M. Vetromilla L.P. Fernandes A. Ozkomur A.N. Silva Júnior S.A.Q. Miguens Júnior P.A.G. Hernandez 《International journal of oral and maxillofacial surgery》2018,47(10):1330-1335
This study was performed to evaluate the compressive mechanical strength of rigid internal fixation (RIF) using 1.5-mm L-shaped plates fixed with monocortical screws in sagittal split osteotomy (SSO). Thirty synthetic hemimandibles, which had all undergone a 5-mm advancement, were divided into three groups: three 12-mm bicortical titanium screws were placed in an inverted L pattern in group A; one straight 2.0-mm system spaced titanium plate fixed with four 5-mm monocortical screws was used in group B; two 1.5-mm system L-shaped titanium plates, each fixed with four 5-mm monocortical screws, were used in group C. The models were subjected to compressive and progressive mechanical tests with forces applied in the area between the second premolar and first molar to verify resistance in Newtons (N). A displacement speed of 1 mm/min was applied, with a maximum 10 mm displacement of the distal segment or until disruption of the fixation. The deformity and/or eventual rupture of the plates were evaluated, and consequently their technical stability was determined. The results showed that the modified fixation technique tested in this study on synthetic mandibles resulted in adequate stability and superior mechanical behaviour compared to simulated osteosynthesis with the use of a straight 2.0-mm titanium plate. 相似文献
7.
Carolina Degen Meotti Glaura Plates Letycia Lopes Chagas Nogueira Renata Anselme da Silva Karoline Silva Paolini Elias Moreira Nunes Fred Bernardes Filho 《Anais brasileiros de dermatologia》2014,89(2):332-333
Cutaneous larva migrans is a pruritic dermatitis due to the inoculation of helminths
larvae in the skin, and it often occurs in children in tropical and subtropical
areas. The authors describe an atypical case of cutaneous larva migrans in a 11
year-old child with scalp involvement, an unusual topography for this lesion. 相似文献
8.
on behalf of the Chagas Study Group of the SEMTSI 《HIV clinical trials》2013,14(6):287-298
AbstractAs a result of population migration, Chagas disease is no longer limited to the North and South American continents. In HIV-infected patients, chronic infection by Try-panosoma cruzi behaves as an opportunistic infection in severely immunosuppressed patients and is responsible for high morbidity and mortality. Unlike other opportunistic infections, information on the natural history, diagnosis, treatment, and prevention of Chagas disease is scarce. Spain has the highest number of cases of Chagas disease outside the North and South American continents, and coinfection with HIV is increasingly prevalent. In this article, the Spanish Society for Tropical Medicine and International Health (Sociedad Española de Medicina Tropical y Salud Interna-cional) reviews the current situation of coinfection with HIV and T. cruzi infection and provides guidelines on the diagnosis, treatment, and prevention in areas where Cha-gas disease is not endemic. It also identifies areas of uncertainty where additional research is necessary. 相似文献
9.
Renata Valle Pedroso Francisco J. Fraga Danilla Icassatti Corazza Carla Andrezza Almeida Andreatto Flávia Gomes de Melo Coelho José Luiz Riani Costa Ruth Ferreira Santos-Galduróz 《Revista brasileira de otorrinolaringologia (English ed.)》2012,78(4):126-132
The P300 plays a key role as a method for monitoring and evaluating dementia, including Alzheimer's disease.Objective: The goal of this study was to search for articles which analyzed P300 latency and amplitude values in Alzheimer's disease.Methods: We searched in the following databases: Web of Science, Pub Med, Psyc Info, Medline, Biological Abstracts and Scielo using the following keywords: speed of information processing, processing speed, information processing, aged, older, elderly, older people, alzheimer dementia, alzheimer disease, Alzheimer and cross-references of selected articles.Results: We found eight studies matching the inclusion criteria. These studies showed that there is a consensus on a P300 latency increase of elderly patients with Alzheimer's disease compared with subjects without the disease. However, it appears that, with respect to the P300 amplitude, there is still no consensus; however, it may be related to different methodological variables adopted in the reviewed studies.Conclusion: There is a need to standardize the variables involved in P300 measurement for senior citizens with Alzheimer's disease in order to be able to compare P300 latency and amplitude values for this population. 相似文献