RESUMO
The PI3K-AKT-mTOR signaling cascade is activated in the majority of human cancers, and its activation also plays a key role in resistance to chemo and targeted therapeutics. In particular, in both breast and prostate cancer, increased AKT pathway activity is associated with cancer progression, treatment resistance and poor disease outcome. Here, we evaluated the activity of a novel allosteric AKT1/2 inhibitor, BAY 1125976, in biochemical, cellular mechanistic, functional and in vivo efficacy studies in a variety of tumor models. In in vitro kinase activity assays, BAY 1125976 potently and selectively inhibited the activity of full-length AKT1 and AKT2 by binding into an allosteric binding pocket formed by kinase and PH domain. In accordance with this proposed allosteric binding mode, BAY 1125976 bound to inactive AKT1 and inhibited T308 phosphorylation by PDK1, while the activity of truncated AKT proteins lacking the pleckstrin homology domain was not inhibited. In vitro, BAY 1125976 inhibited cell proliferation in a broad panel of human cancer cell lines. Particularly high activity was observed in breast and prostate cancer cell lines expressing estrogen or androgen receptors. Furthermore, BAY 1125976 exhibited strong in vivo efficacy in both cell line and patient-derived xenograft models such as the KPL4 breast cancer model (PIK3CAH1074R mutant), the MCF7 and HBCx-2 breast cancer models and the AKTE17K mutant driven prostate cancer (LAPC-4) and anal cancer (AXF 984) models. These findings indicate that BAY 1125976 is a potent and highly selective allosteric AKT1/2 inhibitor that targets tumors displaying PI3K/AKT/mTOR pathway activation, providing opportunities for the clinical development of new, effective treatments.
Assuntos
Nitrilas/farmacologia , Inibidores de Proteínas Quinases/farmacologia , Proteínas Proto-Oncogênicas c-akt/antagonistas & inibidores , Transdução de Sinais/efeitos dos fármacos , Sulfonas/farmacologia , Animais , Células CACO-2 , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Modelos Animais de Doenças , Feminino , Células HeLa , Humanos , Células MCF-7 , Masculino , Camundongos , Camundongos Nus , Camundongos SCID , Fosfatidilinositol 3-Quinases/metabolismo , Fosforilação/efeitos dos fármacos , Serina-Treonina Quinases TOR/metabolismo , Ensaios Antitumorais Modelo de Xenoenxerto/métodosRESUMO
BACKGROUND: The 49-year history of the Teratology Society is reviewed. An abbreviated history is outlined in table form, with listings of the Warkany Lectures, the Continuing Education Courses, and officers of the society. The original article was updated to include the years 2000 to 2010. METHODS: A year-by-year description of the events is given, including the scientific and social content of the annual meetings and changes in the business of the society, in many cases using comments from the past presidents. The valuable and unique diversity of the members is discussed and illustrated, presenting the disciplines and main research areas of the presidents. The number of submitted abstracts and the various categories are tabulated, averaging the number and type over successive periods. A significant increase in the number of abstracts dealing with epidemiology and developmental biology is evident. The society's development is compared to that of a human, and the question was asked by Shephard et al. (2000): Have we reached the maturational stage of old age or senescence, or is the society still maturing gracefully? This question needs further discussion by all the members. By 2010, many positive changes are happening to revitalize the society. RESULTS: During the past 50 years, we have developed the scientific basis to prevent birth defects caused by rubella, alcoholism, and folate deficiency, as well as other prenatal exposures. We are now taking advantage of advances in many fields to begin shaping the Teratology Society of the 21st century. CONCLUSIONS: We must now engage in political battles to obtain the resources needed to conduct further research and to implement prevention programs, as well as to provide care and rehabilitation for persons with birth defects.
Assuntos
Sociedades Médicas , TeratologiaRESUMO
BACKGROUND: A variety of drugs, environmental chemicals, and physical agents induce a common limb malformation in the offspring of pregnant mice exposed on day 9 of gestation. This malformation, postaxial, right-sided forelimb ectrodactyly, is thought to arise via an alteration of hedgehog signaling. METHODS: We have studied two of these teratogens, acetazolamide and cadmium, using the technique of microarray analysis of limb bud ectoderm and mesoderm to search for changes in gene expression that could indicate a common pathway to postaxial limb reduction. RESULTS: Results indicated a generalized up-regulation of gene expression after exposure to acetazolamide but a generalized down-regulation due to cadmium exposure. An intriguing observation was a cadmium-induced reduction of Mt1 and Mt2 expression in the limb bud mesoderm indicating a lowering of embryonic zinc. CONCLUSIONS: We propose that these two teratogens and others (valproic acid and ethanol) lower sonic hedgehog signaling by perturbation of zinc function in the sonic hedgehog protein.
Assuntos
Acetazolamida/toxicidade , Cádmio/toxicidade , Ectoderma/efeitos dos fármacos , Botões de Extremidades/efeitos dos fármacos , Mesoderma/efeitos dos fármacos , Teratogênicos/toxicidade , Animais , Ectoderma/anormalidades , Feminino , Membro Anterior/anormalidades , Membro Anterior/efeitos dos fármacos , Membro Anterior/embriologia , Proteínas Hedgehog/metabolismo , Botões de Extremidades/anormalidades , Botões de Extremidades/embriologia , Mesoderma/anormalidades , Camundongos , Camundongos Endogâmicos C57BL , Análise de Sequência com Séries de OligonucleotídeosRESUMO
OBJECTIVE: To identify existing evidence on interagency collaboration between law enforcement, emergency services, statutory services and third sector agencies regarding people with mental ill health. DESIGN: Systematic scoping review. Scoping reviews map particular research areas to identify research gaps. DATA SOURCES AND ELIGIBILITY: ASSIA, CENTRAL, the Cochrane Library databases, Criminal Justice Abstracts, ERIC, Embase, MEDLINE, PsycINFO, PROSPERO and Social Care Online and Social Sciences Citation Index were searched up to 2017, as were grey literature and hand searches. Eligible articles were empirical evaluations or descriptions of models of interagency collaboration between the police and other agencies. STUDY APPRAISAL AND SYNTHESIS: Screening and data extraction were undertaken independently by two researchers. Arksey's framework was used to collate and map included studies. RESULTS: One hundred and twenty-five studies were included. The majority of articles were of descriptions of models (28%), mixed methods evaluations of models (18%) and single service evaluations (14%). The most frequently reported outcomes (52%) were 'organisational or service level outcomes' (eg, arrest rates). Most articles (53%) focused on adults with mental ill health, whereas others focused on adult offenders with mental ill health (17.4%). Thirteen models of interagency collaboration were described, each involving between 2 and 13 agencies. Frequently reported models were 'prearrest diversion' of people with mental ill health (34%), 'coresponse' involving joint response by police officers paired with mental health professionals (28.6%) and 'jail diversion' following arrest (23.8%). CONCLUSIONS: We identified 13 different interagency collaboration models catering for a range of mental health-related interactions. All but one of these models involved the police and mental health services or professionals. Several models have sufficient literature to warrant full systematic reviews of their effectiveness, whereas others need robust evaluation, by randomised controlled trial where appropriate. Future evaluations should focus on health-related outcomes and the impact on key stakeholders.
Assuntos
Comportamento Cooperativo , Pessoal de Saúde , Aplicação da Lei , Transtornos Mentais , Serviços de Saúde Mental , Saúde Mental , Polícia , HumanosRESUMO
INTRODUCTION: Police officers frequently come into contact with individuals with mental health problems. Specialist training in this area for police officers may improve how they respond to individuals with mental health problems; however, evidence to support this is sparse. This study evaluated the effectiveness of one bespoke mental health training package for frontline police officers relative to routine training. DESIGN: Pragmatic, two-armed cluster randomised controlled trial in one police force in England. Police stations in North Yorkshire were randomised with frontline police officers receiving either a bespoke mental health training package or routine training. The primary outcome was the number of incidents which resulted in a police response reported to the North Yorkshire Police control room up to six months after delivery of training. Secondary outcomes included: likelihood of incidents using Section 136 of the Mental Health Act; likelihood of incidents having a mental health tag applied; and number of individuals with a mental health warning marker involved in incidents. The appropriateness of mental health tags applied to a random sample of incidents was checked by an independent mental health professional. Routinely collected data were used. RESULTS: Twelve police stations were recruited and randomised (Intervention group n = 6; Control group n = 6), and 249 officers received the bespoke mental health training intervention. At follow-up, a median of 397 incidents were assigned to trial stations in the intervention group, and 498 in the control group. There was no evidence of a difference in the number of incidents with a police response (adjusted incidence rate ratio (IRR) 0.92, 95% CI 0.61 to 1.38, p = 0.69), or in the number of people with mental health warning markers involved in incidents (adjusted IRR 1.39, 95% CI 0.91 to 2.10, p = 0.13) between the intervention and control groups up to six months following the intervention; however, incidents assigned to stations in the intervention group were more likely to have a mental health tag applied to them than incidents assigned to control stations (adjusted odds ratio 1.41, 95% CI 1.16 to 1.71, p = 0.001). The review of 100 incidents suggests that there may be incidents involving individuals with mental health issues that are not being recorded as such (Kappa coefficient 0.65). There was no statistically significant difference in the likelihood of Section 136 of the Mental Health Act being applied to an incident. CONCLUSIONS: The bespoke one day mental health training delivered to frontline officers by mental health professionals did not reduce the number of incidents reported to the police control room up to six months after its delivery; however training may have a positive effect on how the police record incidents involving individuals with mental health problems. Our trial has shown that conducting pragmatic trials within the police setting is feasible and acceptable. There is a wealth of routinely collected police data that can be utilised for research and further collaboration between police forces and academia is encouraged. TRIAL REGISTRATION: ISRCTN (ISRCTN11685602). The authors confirm that all ongoing and related trials for this drug/intervention are registered.
Assuntos
Capacitação em Serviço , Pessoas Mentalmente Doentes , Polícia/educação , Relações Profissional-Paciente , Comunicação , Inglaterra , Humanos , Características de ResidênciaRESUMO
BACKGROUND: There has been an increased drive towards Evidence Based Policing in recent years. Unlike in other public sector services, such as health and education, randomised controlled trials in the police setting are relatively rare. This paper discusses some of the methodological and practical challenges of conducting a randomised controlled trial in the police setting in the UK, based on our experience of the Connect trial. This pragmatic, cluster-randomised controlled trial investigated the effectiveness of a face-to-face training intervention for frontline officers in comparison to routine training. The primary outcome was the number of incidents which resulted in a police response reported to North Yorkshire Police control room in a 1-month period up to 6 months after delivery of training. MAIN TEXT: The methodological and practical challenges that we experienced whilst conducting the Connect trial are discussed under six headings: establishing the unit of randomisation; population of interest and sample size; co-production of evidence; time frame; outcomes; and organisational issues. CONCLUSION: Recommendations on the conduct of future randomised controlled trials in the police setting are made. To understand the context in which research is undertaken, collaboration between police and academia is needed and police officers should be embedded within trial management groups. Engagement with police data analysts to understand what data is available and facilitate obtaining trial data is also recommended. Police forces may wish to review their IT systems and recording practices. Pragmatic trials are encouraged and time frames need to allow for trial set-up and obtaining relevant ethical approvals. TRIAL REGISTRATION: ISRCTN Registry, ID: ISRCTN11685602 . Retrospectively registered on 13 May 2016.
Assuntos
Polícia , Ensaios Clínicos Controlados Aleatórios como Assunto/métodos , Análise de Dados , Humanos , Colaboração Intersetorial , Avaliação de Resultados em Cuidados de Saúde , Ensaios Clínicos Pragmáticos como Assunto , Tamanho da AmostraRESUMO
The phosphoinositide 3-kinase (PI3K) pathway is aberrantly activated in many disease states, including tumor cells, either by growth factor receptor tyrosine kinases or by the genetic mutation and amplification of key pathway components. A variety of PI3K isoforms play differential roles in cancers. As such, the development of PI3K inhibitors from novel compound classes should lead to differential pharmacological and pharmacokinetic profiles and allow exploration in various indications, combinations, and dosing regimens. A screening effort aimed at the identification of PI3Kγ inhibitors for the treatment of inflammatory diseases led to the discovery of the novel 2,3-dihydroimidazo[1,2-c]quinazoline class of PI3K inhibitors. A subsequent lead optimization program targeting cancer therapy focused on inhibition of PI3Kα and PI3Kß. Herein, initial structure-activity relationship findings for this class and the optimization that led to the identification of copanlisib (BAY 80-6946) as a clinical candidate for the treatment of solid and hematological tumors are described.
Assuntos
Imidazóis/farmacologia , Inibidores de Proteínas Quinases/farmacologia , Pirimidinas/farmacologia , Quinazolinas/farmacologia , Antineoplásicos/síntese química , Antineoplásicos/química , Antineoplásicos/farmacologia , Sítios de Ligação , Linhagem Celular Tumoral , Classe I de Fosfatidilinositol 3-Quinases/antagonistas & inibidores , Classe Ib de Fosfatidilinositol 3-Quinase/química , Descoberta de Drogas , Humanos , Ligação de Hidrogênio , Imidazóis/síntese química , Imidazóis/química , Simulação de Acoplamento Molecular , Inibidores de Fosfoinositídeo-3 Quinase , Inibidores de Proteínas Quinases/síntese química , Inibidores de Proteínas Quinases/química , Pirimidinas/síntese química , Pirimidinas/química , Quinazolinas/síntese química , Quinazolinas/química , Relação Estrutura-AtividadeRESUMO
Six to eight copies of a transgene integrated into mouse chromosome 15 resulting in a new transgene insertional mutant, Footless, presenting with malformations of the limbs, kidney, and soft palate. Homozygotes possess a unique asymmetric pattern of limb truncations. Posterior structures from the autopod and zeugopod of the hindlimbs are missing with left usually more severely affected than right. In contrast, anterior structures are missing from the right forelimbs. The left forelimb is usually normal except for the absence of the distal telephalanges and nails. These structures are absent on all formed digits. In situ hybridization assays examined the expression of Shh, dHand, Msx2, Fgf8, En1, and Lmx1b in mutant limb buds and indicated normal establishment of the anterior/posterior and dorsal/ventral axes of the developing limbs. However, dysmorphology of the apical ectodermal ridge was observed in the mutant limb buds.
Assuntos
Extremidades/embriologia , Deformidades Congênitas dos Membros/genética , Animais , Southern Blotting , Fissura Palatina/embriologia , Proteínas de Ligação a DNA/metabolismo , Feminino , Fator 8 de Crescimento de Fibroblasto , Fatores de Crescimento de Fibroblastos/fisiologia , Genótipo , Heterozigoto , Proteínas de Homeodomínio , Homozigoto , Hibridização In Situ , Rim/embriologia , Camundongos , Modelos Genéticos , Mutação , Palato Mole/embriologia , Fenótipo , Fatores de Tempo , TransgenesRESUMO
Administration of CdSO(4) to C57BL/6 mice at day 9.5 of gestation induces a high incidence of postaxial forelimb ectrodactyly in the offspring. We propose that Cd(2+) exposure impairs the process of anterior/posterior formation in the limb bud, a process that is directed by Sonic hedgehog (Shh) signaling. We show that exposure of the mouse embryo to Cd(2+) disrupts Shh signaling as measured by polarizing activity of mouse limb bud ZPA grafted to a host chick wing, and activity of a Gli:luciferase reporter exposed to limb bud lysates. Yet the expression of Shh and its translation are not affected by Cd(2+) exposure. We propose that teratogen exposure affects the processing of Shh in the cells in which it is made.
Assuntos
Compostos de Cádmio/toxicidade , Membro Anterior/anormalidades , Efeitos Tardios da Exposição Pré-Natal , Transdução de Sinais/efeitos dos fármacos , Sulfatos/toxicidade , Transativadores/biossíntese , Deformidades Congênitas das Extremidades Superiores/metabolismo , Animais , Western Blotting , Padronização Corporal , Embrião de Galinha , Ectoderma/metabolismo , Desenvolvimento Embrionário/efeitos dos fármacos , Feminino , Membro Anterior/embriologia , Membro Anterior/metabolismo , Idade Gestacional , Proteínas Hedgehog , Marcação In Situ das Extremidades Cortadas , Botões de Extremidades , Mesoderma/metabolismo , Camundongos , Camundongos Endogâmicos C57BL , Gravidez , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Deformidades Congênitas das Extremidades Superiores/induzido quimicamente , Deformidades Congênitas das Extremidades Superiores/embriologia , Asas de Animais/embriologiaRESUMO
We tested the hypothesis that the poor recovery of the coral populations on reefs in the Florida Keys is related to low coral recruitment. In the summer of 2011, we deployed 240 terracotta tiles at eight study sites in a balanced design: (i) among three depths; and (ii) between fished and unfished reefs. Corals recruited to â¼ 40% of the deployed tiles, with more corals settling on tiles on unfished reefs than on fished reefs. The apparent effect of protection was not a consequence of different densities of herbivorous fishes, but was more likely related to local hydrography and the tendency of the no-take reserves to act as larval sinks, particularly in the lower Florida Keys. There was a mismatch between the coral taxa that recruited and the adult coral assemblages, suggesting that recruits were arriving but not surviving to contribute to coral recovery.
Assuntos
Antozoários/fisiologia , Recifes de Corais , Animais , Ecossistema , Peixes , FloridaRESUMO
Because of the complexity derived from the existence of various phosphoinositide 3-kinase (PI3K) isoforms and their differential roles in cancers, development of PI3K inhibitors with differential pharmacologic and pharmacokinetic profiles would allow best exploration in different indications, combinations, and dosing regimens. Here, we report BAY 80-6946, a highly selective and potent pan-class I PI3K inhibitor with sub-nanomolar IC50s against PI3Kα and PI3Kδ. BAY 80-6946 exhibited preferential inhibition (about 10-fold) of AKT phosphorylation by PI3Kα compared with PI3Kß in cells. BAY 80-6946 showed superior antitumor activity (>40-fold) in PIK3CA mutant and/or HER2 overexpression as compared with HER2-negative and wild-type PIK3CA breast cancer cell lines. In addition, BAY 80-6946 revealed potent activity to induce apoptosis in a subset of tumor cells with aberrant activation of PI3K as a single agent. In vivo, single intravenous administration of BAY 80-6946 exhibited higher exposure and prolonged inhibition of pAKT levels in tumors versus plasma. BAY 80-6946 is efficacious in tumors with activated PI3K when dosed either continuously or intermittently. Thus, BAY 80-6946 induced 100% complete tumor regression when dosed as a single agent every second day in rats bearing HER2-amplified and PIK3CA-mutated KPL4 breast tumors. In combination with paclitaxel, weekly dosing of BAY 80-6946 is sufficient to reach sustained response in all animals bearing patient-derived non-small cell lung cancer xenografts, despite a short plasma elimination half-life (1 hour) in mice. Thus, BAY 80-6946 is a promising agent with differential pharmacologic and pharmacokinetic properties for the treatment of PI3K-dependent human tumors.
Assuntos
Resistencia a Medicamentos Antineoplásicos/efeitos dos fármacos , Neoplasias/tratamento farmacológico , Inibidores de Fosfoinositídeo-3 Quinase , Inibidores de Proteínas Quinases/farmacologia , Inibidores de Proteínas Quinases/farmacocinética , Pirimidinas/farmacologia , Quinazolinas/farmacologia , Administração Intravenosa , Animais , Apoptose/efeitos dos fármacos , Linhagem Celular Tumoral , Avaliação Pré-Clínica de Medicamentos , Regulação Neoplásica da Expressão Gênica , Humanos , Camundongos , Camundongos Nus , Terapia de Alvo Molecular , Neoplasias/genética , Neoplasias Experimentais , Fosfatidilinositol 3-Quinases/genética , Fosfatidilinositol 3-Quinases/metabolismo , Pirimidinas/farmacocinética , Quinazolinas/farmacocinética , Ratos , Ratos Nus , Receptor ErbB-2/genética , Receptor ErbB-2/metabolismo , Serina-Treonina Quinases TOR/genética , Serina-Treonina Quinases TOR/metabolismo , Ensaios Antitumorais Modelo de XenoenxertoRESUMO
Herein, we demonstrate that Lrp6-mediated R-spondin 2 signaling through the canonical Wnt pathway is required for normal morphogenesis of the respiratory tract and limbs. We show that the footless insertional mutation creates a severe hypomorphic R-spondin 2 allele (Rspo2(Tg)). The predicted protein encoded by Rspo2(Tg) neither bound the cell surface nor activated the canonical Wnt signaling reporter TOPFLASH. Rspo2 activation of TOPFLASH was dependent upon the second EGF-like repeat of Lrp6. Rspo2(Tg/Tg) mice had severe malformations of laryngeal-tracheal cartilages, limbs and palate, and lung hypoplasia consistent with sites of Rspo2 expression. Rspo2(Tg/Tg) lung defects were associated with reduced branching, a reduction in TOPGAL reporter activity, and reduced expression of the downstream Wnt target Irx3. Interbreeding the Rspo2(Tg) and Lrp6(-) alleles resulted in more severe defects consisting of marked lung hypoplasia and absence of tracheal-bronchial rings, laryngeal structures and all limb skeletal elements.
Assuntos
Extremidades/embriologia , Laringe/embriologia , Pulmão/embriologia , Trombospondinas/fisiologia , Traqueia/embriologia , Animais , Sequência de Bases , DNA Complementar/genética , Proteínas de Ligação a DNA/deficiência , Proteínas de Ligação a DNA/genética , Feminino , Proteínas Relacionadas a Receptor de LDL/deficiência , Proteínas Relacionadas a Receptor de LDL/genética , Proteínas Relacionadas a Receptor de LDL/fisiologia , Laringe/anormalidades , Deformidades Congênitas dos Membros/etiologia , Deformidades Congênitas dos Membros/genética , Proteína-6 Relacionada a Receptor de Lipoproteína de Baixa Densidade , Pulmão/anormalidades , Camundongos , Camundongos Knockout , Camundongos Transgênicos , Morfogênese , Mutagênese Insercional , Gravidez , Transdução de Sinais , Trombospondinas/deficiência , Trombospondinas/genética , Traqueia/anormalidades , Fatores de Transcrição/deficiência , Fatores de Transcrição/genética , Proteínas Wnt/fisiologiaRESUMO
Novel anthranilamides were surprisingly found to exert additional activity on B-RAF. Corresponding thiophene, pyrazole, and thiazole core analogs were prepared as VEGFR-2 inhibitors with c-KIT, and B-RAF activity. Compounds in the phenyl, thiophene, and thiazole series are in vivo active.
Assuntos
Antineoplásicos/farmacologia , Neoplasias/tratamento farmacológico , Inibidores de Proteínas Quinases/farmacologia , Receptor 2 de Fatores de Crescimento do Endotélio Vascular/antagonistas & inibidores , Animais , Antineoplásicos/uso terapêutico , Linhagem Celular Tumoral , Humanos , Camundongos , Inibidores de Proteínas Quinases/uso terapêutico , Relação Estrutura-AtividadeRESUMO
AIMS: The objective of this study was to determine the educational needs of community pharmacists in Australia related to palliative cancer care, to guide the development of an online educational program for pharmacists. METHODS: Questionnaires were posted to a random sample of community pharmacies in Australia. The questionnaire sought information pertaining to pharmacists': demographics; educational needs by rating the importance of learning more about 18 palliative cancer care topics and self-perceived level of knowledge of them; preference for format(s) for the program; willingness to participate in the program; and perception regarding their practice of palliative cancer care. Results were analysed using Statistical Package for the Social Sciences (SPSS) version 11.5 software. MAIN RESULTS: A questionnaire return rate of 10.3% was achieved. The characteristics of respondents were reflective of community pharmacy practice in Australia when compared with the latest available labour force figures by the Australian Institute of Health and Welfare. Pharmacists rated all 18 topics as "important/essential", and their level of knowledge of them as "poor/good". Pharmacists preferred information provided in these formats: text (89.8%), case studies (80.6%) and multi-choice questions (69.4%). Most pharmacists (85.2%) indicated that they would participate in the program. The majority of pharmacists (71.3%) reported that they deliver palliative cancer care services; usually less-than-monthly (24.1%) or weekly (21.3%). CONCLUSIONS: Educational needs of community pharmacists in palliative cancer care were identified. The information gathered will assist in guiding the development of an online educational program for pharmacists to improve their knowledge and skills in palliative cancer care.
Assuntos
Serviços Comunitários de Farmácia , Educação Continuada em Farmácia , Avaliação das Necessidades , Neoplasias/reabilitação , Cuidados Paliativos , Adulto , Idoso , Austrália , Feminino , Pesquisas sobre Atenção à Saúde , Conhecimentos, Atitudes e Prática em Saúde , Humanos , Masculino , Pessoa de Meia-Idade , Neoplasias/terapiaRESUMO
A series of 4,5-disubstituted cis-pyrrolidinones was investigated as inhibitors of 17beta-HSD II for the treatment of osteoporosis. Biochemical data for several compounds are given. Compound 42 was selected as the lead candidate.
Assuntos
17-Hidroxiesteroide Desidrogenases/antagonistas & inibidores , Inibidores Enzimáticos/síntese química , Inibidores Enzimáticos/farmacologia , Pirrolidinonas/química , Pirrolidinonas/farmacologia , Tiofenos/química , Tiofenos/farmacologia , 17-Hidroxiesteroide Desidrogenases/metabolismo , Animais , Linhagem Celular , Inibidores Enzimáticos/química , Humanos , Concentração Inibidora 50 , Macaca fascicularis , Pirrolidinonas/síntese química , Ratos , Estereoisomerismo , Relação Estrutura-Atividade , Tiofenos/síntese químicaRESUMO
A variety of teratogens induce the loss of postaxial forelimb structures when administered during mid-gestation to the mouse. Previous studies demonstrated that teratogen exposure is associated with a reduction in zone of polarizing activity (ZPA) -related polarizing activity without a noticeable loss of Shh expression. Herein, we quantitatively confirm that expression of Shh, Ptch1, and Gli3 are unaltered by teratogen exposure and demonstrate that sonic hedgehog (Shh) translation is unaffected. Examination of the polarizing response of host chick wings to teratogen-exposed ZPA tissue revealed an induced growth response and ectopic induction of Fgf4, Bmp2, Ptch1, and Gli1 expression similar to control ZPA tissue. Control ZPA tissue altered the fate of cells destined to die in the anterior necrotic zone, whereas cell death ensued in hosts receiving teratogen-exposed grafts. Immunohistochemical studies localized Shh protein in the mouse limb to the posterior mesoderm and overlying ectoderm. We postulate that teratogen exposure alters the ability of Shh to signal to the ectoderm and present microarray and reverse transcriptase-polymerase chain reaction data, indicating that Shh signaling could occur in the limb bud ectoderm.
Assuntos
Ectoderma/efeitos dos fármacos , Ectoderma/metabolismo , Botões de Extremidades/embriologia , Deformidades Congênitas dos Membros/induzido quimicamente , Transdução de Sinais/efeitos dos fármacos , Teratogênicos/farmacologia , Transativadores/metabolismo , Animais , Morte Celular , DNA Complementar/genética , Ectoderma/citologia , Proteínas Hedgehog , Botões de Extremidades/citologia , Botões de Extremidades/efeitos dos fármacos , Botões de Extremidades/metabolismo , Deformidades Congênitas dos Membros/embriologia , Deformidades Congênitas dos Membros/metabolismo , Deformidades Congênitas dos Membros/patologia , Mesoderma/efeitos dos fármacos , Mesoderma/metabolismo , Camundongos , Transativadores/genética , Asas de Animais/efeitos dos fármacos , Asas de Animais/embriologia , Asas de Animais/metabolismoRESUMO
In this report we describe the developmental expression and function of Sp8, a member of the Sp family of zinc finger transcription factors, and provide evidence that the legless transgene insertional mutant is a hypomorphic allele of the Sp8 gene. Sp8 is expressed during embryogenesis in the forming apical ectodermal ridge (AER), restricted regions of the central nervous system, and tail bud. Targeted deletion of the Sp8 gene gives a striking phenotype, with severe truncation of both forelimbs and hindlimbs, absent tail, as well as defects in anterior and posterior neuropore closure leading to exencephaly and spina bifida. Outgrowth of the limb depends on formation of the AER, a signaling center that forms at the limb bud apex. In Sp8 mutants, the AER precursor cells are induced and initially express multiple appropriate marker genes, but expression of these genes is not maintained and progression to a mature AER is blocked. These observations indicate that Sp8 functions downstream of Wnt3, Fgf10, and Bmpr1a in the signaling cascade that mediates AER formation.
Assuntos
Extremidades/embriologia , Fatores de Transcrição/fisiologia , Sequência de Aminoácidos , Animais , Sequência de Bases , Padronização Corporal , DNA/genética , Marcação de Genes , Hibridização In Situ , Camundongos , Camundongos Knockout , Fenótipo , Transdução de Sinais , Fatores de Transcrição/genética , Dedos de Zinco/genética , Dedos de Zinco/fisiologiaRESUMO
A unique limb phenotype is described in a radiation-induced mutant mouse resulting from an inversion of a proximal segment of chromosome 5. The limb phenotype in the homozygous mutant presents with two anterior skeletal elements in the zeugopod but no posterior bone, hence the name replicated anterior zeugopod, raz. The zeugopod phenotype is accompanied by symmetrical central polydactyly of hand and foot. The chromosomal inversion includes the Shh gene and the regulatory locus, located approximately 1 Mb away, within the Lmbr1 gene. In homozygous mutants, the expression of Shh mRNA and Shh protein is severely downregulated to about 20% of wild-type limb buds, but Shh expression appears normal throughout the remainder of the embryo. Correspondingly, Gli3 expression is upregulated and posteriorly expanded in the raz/raz limb bud. We propose that the double anterior zeugopod and symmetrical central polydactyly are due to an increased and uniform concentration of the Gli3 repressor form because of lowered Shh signaling.
Assuntos
Proteínas de Ligação a DNA/metabolismo , Membro Anterior/anatomia & histologia , Botões de Extremidades/metabolismo , Proteínas do Tecido Nervoso , Polidactilia/genética , Transdução de Sinais/fisiologia , Transativadores/metabolismo , Fatores de Transcrição/metabolismo , Animais , Padronização Corporal , Inversão Cromossômica , Cromossomos de Mamíferos/efeitos da radiação , Proteínas de Ligação a DNA/genética , Feminino , Membro Anterior/anormalidades , Membro Anterior/embriologia , Genótipo , Proteínas Hedgehog , Fatores de Transcrição Kruppel-Like , Masculino , Proteínas de Membrana/genética , Proteínas de Membrana/metabolismo , Camundongos , Camundongos Endogâmicos DBA , Morfogênese , Receptores Patched , Fenótipo , Receptores de Superfície Celular , Transativadores/genética , Fatores de Transcrição/genética , Raios X , Proteína Gli3 com Dedos de ZincoRESUMO
Inhibitors of the MAP kinase p38 provide a novel approach for the treatment of osteoporosis, inflammatory disorders, and cancer. We have identified N-(3-tert-butyl-1-methyl-5-pyrazolyl)-N'-(4-(4-pyridinylmethyl)phenyl)urea as a potent and selective p38 kinase inhibitor in biochemical and cellular assays. This compound is orally active in two acute models of cytokine release (TNF-induced IL-6 and LPS-induced TNF) and a chronic model of arthritis (20-day murine collagen-induced arthritis).