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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Human eosinophils and their activation by allergens via danger receptors

Redvall, Elin, January 2010 (has links)
Diss. (sammanfattning) Göteborg : Univ. , 2010.
2

Maternally Inherited Peptides Are Strain Specific Chemosignals That Activate a New Candidate Class of Vomeronasal Chemosensory Receptor

Roberts, Richard William January 2009 (has links)
<p>The chemical cues that provide an olfactory portrait of mammalian individuals are in part detected by chemosensory receptors in the vomeronasal organ (VNO). By and large, the pertinent receptor-cue combinations used for olfactory communication are unidentified. Here we identify members of the formyl peptide receptor (FPR) family of G protein coupled receptors as candidate chemosensory receptors in the VNO of mice. We demonstrate that N-formylated mitochondrially encoded peptides presented by the major histocompatibility complex (MHC) molecule H2-M3 stimulate a subset of the VNO sensory neurons (VSNs). We show that one VNO localized FPR, Fpr-rs1, is differentially activated by strain specific variants of N-formylated peptides. We show that N-formylated peptides can function as chemosignals in a strain selective pregnancy block. We propose that this link between self-recognition peptides of the immune system and chemosensory pathways provides a possible molecular means to communicate the nature of an individual's maternal lineage or strain.</p> / Dissertation
3

Použití agonistů FPR receptorů pro terapii nádorových onemocnění / The use of agonists of formyl peptide receptors for cancer therapy

CAISOVÁ, Veronika January 2013 (has links)
The main goal of the thesis was to optimize the use of agonists of the FPR receptors for cancer therapy. The aim was: (1) to find the best anchor of ligands to the cancer cells and the optimal timing of the treatment, (2) to verify the universality of agonists of FPR receptors for different types of cancer, (3) to explain the synergy between ligands of FPR and ligands of TLR by flow cytometry and (4) to verify the applicability of cytotoxic test CD45+/ PI for f-MLF-DOPE ligand.
4

Alterações na expressão de receptores de peptídeos formilados, citocinas e monócitos que auxiliam no colapso vascular e imunológico da sepse / Changes in the expression of formyl peptide receptors, cytokines, and monocytes that aid in the vascular and immune collapse of sepsis

Alves, Patrícia Terra 16 October 2017 (has links)
A tese encontra-se em formato de artigos conforme norma do Programa de Pós-graduação em Genética e Bioquímica da Universidade Federal de Uberlândia. Esta tese é composta por 4 capítulos, sendo o primeiro capítulo a revisão bibliografica a qual foi escrita em português de acordo com as normas da ABNT e os demais capítulos refere-se a artigos científicos os quais estão em inglês e obdecem as normas das revistas científicas as quais serão submetidos. / CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico / A sepse é uma síndrome clínica grave responsável por grande parte dos óbitos nas Unidades de Terapia Intensiva. Há uma diversidade de causas primárias que podem evoluir para um quadro clínico de sepse o que dificulta o diagnóstico precoce e a descoberta de drogas eficientes para tratamento. Os altos custos dos tratamentos e as taxas de letalidade mundial demonstram a necessidade de uma melhor compreensão desta síndrome. Este estudo buscou avaliar a expressão gênica dos Receptores de Peptídeos Formilados (FPR) em leucócitos totais, análise de marcadores sistêmicos e o perfil proteínas globais dos monócitos para averiguar as alterações presentes no organismo do indivíduo com a síndrome da sepse. Foi realizado a caracterização das alterações sistêmicas responsáveis pelo óbito de pacientes com sepse através da quantificação simultânea de 27 biomarcadores; verificou-se o silenciamento da expressão gênica do FPR1 e o FPR2 em pacientes com sepse e choque, relatando as possíveis disfunções imunológicas provocadas pela ausência desses FPRs; e a análise proteômica dos monócitos de pacientes com choque séptico permitiu averiguar a contribuição dessa célula no colapso desta síndrome, sua influência na lesão vascular, endotoxemia, inflamação e trombose. Esta investigação identificou pela primeira vez alvos biológicos relevantes os quais podem desempenhar papeis importantes no diagnóstico, prognóstico e terapêutica. / Sepsis is a serious clinical syndrome responsible for most of the deaths in the Intensive Care Units. There are a number of primary causes that may develop for a clinical picture of sepsis, making it difficult to diagnose early and find effective treatment medications. The high costs of treatments and global lethality rates demonstrate the need for a better understanding of this syndrome. This study aimed to evaluate the gene expression of Formulated Peptide Receptors (FPR) in total leukocytes, analysis of systemic markers and the profile of monocyte global proteins to ascertain the changes present in the body of the individual with sepsis syndrome. The characterization of the systemic changes responsible for the death of patients with sepsis was carried out through the simultaneous quantification of 27 biomarkers. The silencing of the gene expression of FPR1 and FPR2 in patients with sepsis and septic shock, reporting as possible immunological dysfunctions caused by the absence of these FPRs. The proteomic analysis of the monocytes of patients with septic shock allowed us to investigate the contribution of this cell in the collapse of this syndrome, its influence on vascular injury, endotoxemia, inflammation and thrombosis. This research identified for the first time, what is more important for the diagnosis, prognosis and therapeutics. / Tese (Doutorado)
5

Análise da heterogeneidade dos mastócitos e expressão da proteína Anexina A1 e receptores FPR em variáveis clínico-patológicas de lesões uterinas / Analysis of mast cell heterogeneity and expression of the Annexin A1 protein and FPR receptors in clinicopathological variables of uterine lesions

Costa, Sara de Souza [UNESP] 02 March 2017 (has links)
Submitted by SARA DE SOUZA COSTA null (sarah_sc_0705@hotmail.com) on 2017-03-30T13:36:06Z No. of bitstreams: 1 Dissertação Sara de Souza Costa.pdf: 2766240 bytes, checksum: 20b447fe5bf3c49e40aa0b5fdf4dff1f (MD5) / Approved for entry into archive by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br) on 2017-04-06T13:29:26Z (GMT) No. of bitstreams: 1 costa_ss_me_sjrp.pdf: 2766240 bytes, checksum: 20b447fe5bf3c49e40aa0b5fdf4dff1f (MD5) / Made available in DSpace on 2017-04-06T13:29:26Z (GMT). No. of bitstreams: 1 costa_ss_me_sjrp.pdf: 2766240 bytes, checksum: 20b447fe5bf3c49e40aa0b5fdf4dff1f (MD5) Previous issue date: 2017-03-02 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / As lesões uterinas são causas importantes de desconforto, infertilidade e óbito entre as mulheres no Brasil e no mundo. O câncer de endométrio é um tumor maligno frequente e sua incidência vem aumentando nas últimas décadas. Enquanto, o tumor uterino benigno mais comum, o leiomioma, acomete cerca de 40% das mulheres na idade reprodutiva, sendo relacionado à menorragia, dismenorreia e infertilidade. Investigações indicam que o microambiente tumoral é crucial para o avanço do câncer, sendo caracterizado, principalmente, pela composição alterada da matriz extracelular, alta densidade de microvasos e abundância de células inflamatórias, como mastócitos (MCs). MCs desgranulados liberam fatores quimiotáticos e proteases, como triptase e quimase, para o meio extracelular, contribuindo na degradação da matriz extracelular, promoção da angiogênese, propiciando ambiente favorável para invasão tumoral e remodelação tecidual por meio de proteólises seletivas na matriz e ativação de metaloproteinases. Outro aspecto importante no crescimento tumoral é a proteína anti-inflamatória Anexina A1 (ANXA1), relacionada à regulação dos processos de crescimento e migração/invasão celular, sendo seus efeitos mediados por receptores para peptídeos formilados (FPRs), especialmente FPR1 e FPR2. Diante da importância dos MCs e da ANXA1/FPR no desenvolvimento tumoral, o objetivo desta investigação foi analisar a heterogeneidade dos MCs e a expressão das proteínas ANXA1, FPR1 e FPR2 em biópsias humanas das variáveis clínico-patológicas de útero normal: hiperplasia endometrial simples (HES), adenomiose, leiomiomas e adenocarcinoma (ADC) endometrial de graus I e II. Os MCs foram quantificados de acordo com seu estado de ativação e expressão das proteases triptase e quimase. A expressão da ANXA1 e seus receptores FPR1 e FPR2 nos MCs e tecidos uterinos foram analisadas nas diferentes biópsias estudadas. Nossos resultados mostraram MCs intactos e desgranulados, no endométrio e miométrio normais e aumentados na HES, margens tumorais nos leiomiomas, adenomiose e ADC endometrial de graus I e II, e diminuídos significantemente na região tumoral do leiomioma. Com relação à heterogeneidade, os MCs triptase-positivos foram observados em maior quantidade. As expressões endógenas da ANXA1 e do FPR1 foram observadas nos tecidos uterinos e MCs, com ausência para o FPR2. As modulações dos MCs, da proteína ANXA1 e de modo específico do receptor FPR1, nas variáveis clínico-patológicas das lesões uterinas investigadas indicam o envolvimento dessas células e a interação ANXA1/FPR1 no desenvolvimento de inflamação e neoplasia uterina. / Uterine lesions are important causes of discomfort, infertility and death among women in Brazil and in the world. Endometrial cancer is a frequent malignant tumor and its incidence has been increasing in the last decades. Besides, the most common benign uterine tumor, leiomyoma, affects about 40% of women at reproductive age, being related to menorrhagia, dysmenorrhea and infertility. Investigations indicate that the tumor microenvironment is crucial for the advancement of cancer, being characterized mainly by the altered composition of the extracellular matrix, high microvessel density and abundance of inflammatory cells, such as mast cells (MCs). Degranulated MCs release chemotactic and protease factors, such as tryptase and chymase, to the extracellular medium, contributing to the degradation of the extracellular matrix, promoting angiogenesis, providing a favorable environment for tumor invasion and tissue remodeling through selective proteolysis in the matrix and activation of metalloproteinases. Another important aspect of tumor growth is the anti-inflammatory protein Annexin A1 (ANXA1), related to the regulation of growth and migration / invasion processes, and its effects mediated by receptors for formylated peptides (FPRs), especially FPR1 and FPR2. The objective of this investigation was to analyze the heterogeneity of the MCs and the expression of the ANXA1, FPR1 and FPR2 proteins in human biopsies of clinical-pathological variables of normal uterus: simple endometrial hyperplasia (HES), adenomyosis, leiomyomas and endometrial adenocarcinoma (ADC) of grades I and II. MCs were quantified according to their state of activation and expression of tryptase and chymase proteases. Expression of ANXA1 and its FPR1 and FPR2 receptors in the MCs and uterine tissues were analyzed in the different biopsies studied. Our results showed intact and degranulated MCs in the normal endometrium and myometrium and increased MCs in HES, tumor margins in leiomyomas, adenomyosis and endometrial ADC of grades I and II, but significantly decreased in the leiomyoma tumor region. In relation to the heterogeneity, it was observed that the tryptase-positive MCs were observed in greater quantity. Endogenous expressions of ANXA1 and FPR1 were observed in uterine tissues and MCs, but absent for FPR2. Modulations of MCs and ANXA1 protein expression and the specificity of FPR1 receptor immunolabeling in the clinical-pathological variables of the investigated uterine lesions indicate the involvement of these cells and the interaction ANXA1/FPR1 in the development of inflammation and uterine neoplasia.

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