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1.
Aust J Rural Health ; 31(3): 471-483, 2023 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-36762906

RESUMO

OBJECTIVE: This paper draws on the principles of suicide risk safety planning to co-design a farming community resource for preventing and managing risks to mental health. SETTING: This project was undertaken in the Great South Coast Region of Victoria, Australia. PARTICIPANTS: A working group (n = 6-8) from the Victorian farming community contributed to the iterative co-design and co-production of Steering Straight: My plan to keep on track. Twenty-four members of the farming community pilot tested Steering Straight. DESIGN: Co-design to develop, pilot and refine the resource with working group and target farming community. RESULTS: Steering Straight was viewed positively by the farming community as a tool that prompts prioritising well-being; encourages reflection, planning and concrete steps towards taking action; helps set and meet personal goals; is simple and practical; and identifies pathways to support. Most participants (94%) completed Steering Straight on their own, taking approximately 15-30 min to create their personalised plan. Questions most likely to be filled in related to recognising personal signs of deteriorating well-being and listing and planning enjoyable activities. A majority of participants (67%) kept a hard copy of their Steering Straight plan on hand to refer back to, while 78% expressed a preference for a digital version. CONCLUSION: The co-design and co-production process resulted in a tailored prevention-focused resource that was accepted and valued by the farming community.


Assuntos
Autogestão , Suicídio , Humanos , Agricultura , Vitória
2.
Aust J Rural Health ; 31(3): 556-568, 2023 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-37026611

RESUMO

INTRODUCTION: Farmers face a range of factors that negatively influence their mental health and suicide risk, yet have limited access to appropriate support. Behavioural activation (BA) is an evidence-based therapy that can be effectively delivered by nonclinical workers. Working with members of farming communities to deliver BA to their peers has the potential to overcome many well-established barriers to mental health help-seeking and improve outcomes for this at-risk group. OBJECTIVE: This paper describes the findings of a co-design phase informing the development of a peer (farmer)-led approach for delivering BA for farmers living with depression or low mood. DESIGN: This qualitative study used a co-design approach involving members of the target community. Focus groups were transcribed and analysed using Thematic Analysis and the Framework approach. FINDINGS: Ten online focus groups with 22 participants were held over 3 months. Four overarching, interlinked themes were identified: (i) filling the gap in rural mental health support; (ii) alignment with the farming context-tailoring how, where and when we engage about mental health; (iii) the 'messenger' is as important as the message; and (iv) sustainability, governance and support. DISCUSSION: Findings suggest BA could be a contextually appropriate model of support for the farming community-given its practical and solution-focused approach-and could help improve access to support. Having peer workers deliver the intervention was viewed as appropriate. Ensuring governance structures are developed to support peers to deliver the intervention will be essential to facilitate effectiveness, safety and sustainability. CONCLUSION: Insights gained through co-design have been critical to the success of developing this new model of support for members of farming communities experiencing depression or low mood.


Assuntos
Agricultura , Depressão , Saúde Mental , Humanos , Austrália , Depressão/terapia
3.
Aust J Rural Health ; 30(6): 738-746, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-36250962

RESUMO

INTRODUCTION: Investigating how co-designed knowledge can be translated to co-produce a public health capacity-building solution for difficult-to-engage population groups drawing on the co-production experience of a prevention-focused, capacity-building mental health solution targeting primary producers. DESIGN: A qualitative study undertaken in rural and regional Victoria involving members of the design working group including project team (7px), digital design team (5px), marketing team (3px), and funding partner representatives. The study design involved reflective practice to collect data to identify the phases of co-production and assess the design working group members' experiences. The analysis involved inductive coding using Braun and Clarke's thematic analysis. OBJECTIVE: Identifying major points of divergence and/or convergence; enablers and/or constraints; and ways to better navigate and strengthen the co-production process. FINDING: Given members of the design working group, diverse skills sets divergence was experienced in all co-production phases. Divergence was also experienced between the project team and the funding partner given the uniqueness of working conditions and requirements of workers in the primary production industry. The project team applied an iterative development process to project management; encouraging iterative cycles to create/test/revise among the teams, and with the funding partner, until each was satisfied with the end result (convergence). DISCUSSION & CONCLUSION: When developing a co-created public health prevention campaign it is critical that the project team focuses on relationship building among the members of the design working group and ensures adequate resourcing, development of shared understanding of project goals and target audience, ongoing communication, and a commitment to working iteratively.


Assuntos
Saúde Pública , Condições de Trabalho , Humanos , Pesquisa Qualitativa
4.
Aust J Rural Health ; 30(6): 719-729, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-36018893

RESUMO

OBJECTIVE: To explore participant experiences of an online co-design process to develop a web-based preventative mental health and well-being intervention targeting primary producers in rural Australia. SETTING: Rural Victoria, Australia. PARTICIPANTS: Participants from a primary producer background, including horticulture, fisheries, animal cultivation and farm consultancy, were eligible for the study if they had participated in both the co-design and beta testing processes for a primary producer platform. DESIGN: A qualitative study using semi-structured phone-based interviews was undertaken. A reflexive inductive approach to data analysis was employed to develop themes. RESULTS: Eleven participants were interviewed, with an average age of 51 years, of which 7 were female. Five main themes were developed. These included: (1) participant diversity, (2) impact of online delivery on co-design participation, (3) experiences of the co-design process, (4) maintaining a shared vision and goals and (5) acting on the co-design recommendations. Use of online methods was a clear enabler to engage participants who were geographically dispersed and offers an alternative to more conventional approaches to co-design using face-to-face methods. Some aspects of participant engagement may need a greater focus when conducted online compared with face-to-face. CONCLUSIONS: Using an online co-design method to develop a preventative mental health and well-being web-based platform for primary producers was novel. Findings address a gap in the literature around the experience of participants engaging in a co-design process and identify opportunities to improve participant engagement and experience with the online format.


Assuntos
Saúde Mental , Humanos , Feminino , Masculino , Pesquisa Qualitativa , Vitória
5.
Med Teach ; 39(9): 959-966, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-28562145

RESUMO

OBJECTIVE: To establish the most effective approach and type of educational intervention for health professional students, to enable them to maintain a professionally safe online presence. METHOD: This was a qualitative, multinational, multi-institutional, multiprofessional study. Practical considerations (availability of participants) led us to use a combination of focus groups and individual interviews, strengthening our findings by triangulating our method of data collection. The study gathered data from 57 nursing, medical and paramedical students across four sites in three countries (Aotearoa/New Zealand, Australia and Wales). A content analysis was conducted to clarify how and why students used Facebook and what strategies they thought might be useful to ensure professional usage. A series of emergent codes were examined and a thematic analysis undertaken from which key themes were crystallized. RESULTS: The results illuminated the ways in which students use social networking sites (SNS). The three key themes to emerge from the data analysis were negotiating identities, distancing and risks. Students expressed the wish to have material about professional safety on SNS taught to them by authoritative figures to explain "the rules" as well as by peers to assist with practicalities. Our interactive research method demonstrated the transformative capacity of the students working in groups. CONCLUSIONS: Our study supports the need for an educational intervention to assist health professional students to navigate SNS safely and in a manner appropriate to their future roles as health professionals. Because health professional students develop their professional identity throughout their training, we suggest that the most appropriate intervention incorporate small group interactive sessions from those in authority, and from peers, combined with group work that facilitates and enhances the students' development of a professional identity.


Assuntos
Educação de Graduação em Medicina/métodos , Mídias Sociais , Rede Social , Estudantes de Ciências da Saúde , Estudantes de Medicina , Austrália , Educação de Graduação em Medicina/organização & administração , Grupos Focais , Pessoal de Saúde , Humanos , Nova Zelândia , Pesquisa Qualitativa
6.
Australas Psychiatry ; 22(2): 195-9, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24526794

RESUMO

OBJECTIVE: There is limited information as to whether graduates from postgraduate specialist medical training programmes in Australia and New Zealand feel prepared for practice, and none regarding the Royal Australian and New Zealand College of Psychiatrists' (RANZCP) training programme. The aims of this study were: to assess the effectiveness of the RANZCP training programme in producing psychiatrists who feel prepared for their roles; and to obtain Fellowship applicants' perceptions of the training programme. METHODS: Applicants for Fellowship (i.e. trainees who had successfully completed RANZCP training) were invited to complete an anonymous online survey that assessed their preparedness for practice and their impressions of the training programme, supervision, training specialties and course content. RESULTS: The response rate was 66% from 101 applicants. Fellowship applicants largely felt prepared for practice and had positive perceptions of the training programme. The majority stated that most of their learning goals were met, but continued training and ongoing learning was required. Areas for improvement included assessments, administration, the balance between service delivery and training, and ongoing training. CONCLUSIONS: Fellowship applicants largely felt confident in their ability to deliver psychiatric services and that the training programme was meeting their needs.


Assuntos
Atitude do Pessoal de Saúde , Competência Clínica , Psiquiatria/educação , Austrália , Coleta de Dados , Humanos , Nova Zelândia
7.
Australas Psychiatry ; 22(3): 288-291, 2014 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-24696412

RESUMO

OBJECTIVES: Managing insomnia is a common challenge for psychiatrists and their patients. We have observed an increasing use of quetiapine as a hypnosedative. METHODS: We conducted an audit with the aim of establishing the prescribing patterns of local general psychiatrists in New Zealand, comparing them with established guidelines and determining the extent of the prescribing of quetiapine as a hypnosedative. Participant psychiatrists were recruited from peer review groups. Each participant provided anonymised prescribing information from 10 patients and noted their intention when prescribing. RESULTS: Twenty-five clinicians (58% response rate) responded with prescriptions for 100 in-patients and 177 community mental health patients. 60% of in-patients and 62% of community patients were prescribed medications to aid with sleep. The most commonly prescribed medications were zopiclone, quetiapine and benzodiazepines. Prescribing adhered with the recommended guidelines for 20% of benzodiazepine and 35% of zopiclone prescriptions. Two thirds (60%) of the community prescriptions for quetiapine were primarily for hypnosedation. CONCLUSIONS: There is little concordance between guidelines for hypnosedative prescribing and the practices of general psychiatrists. Less zopiclone and fewer benzodiazepines were prescribed than in other studies, while more quetiapine was prescribed. The 'off-label' use of quetiapine and the duration of zopiclone and benzodiazepine use are discussed.

8.
Sensors (Basel) ; 13(10): 13624-37, 2013 Oct 10.
Artigo em Inglês | MEDLINE | ID: mdl-24152925

RESUMO

Aptamers, and the selection process known as Systematic Evolution of Ligands by Exponential Enrichment (SELEX) used to generate them, were first described more than twenty years ago. Since then, there have been numerous modifications to the selection procedures. This review discusses the use of modified bases as a means of enhancing serum stability and producing effective therapeutic tools, as well as functionalising these nucleic acids to be used as potential diagnostic agents.


Assuntos
Aptâmeros de Nucleotídeos/uso terapêutico , Aptâmeros de Peptídeos/uso terapêutico , Técnicas Biossensoriais/métodos , Técnica de Seleção de Aptâmeros/instrumentação , Técnica de Seleção de Aptâmeros/métodos , Animais , Humanos
9.
Acad Psychiatry ; 36(5): 374-9, 2012 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-22983468

RESUMO

OBJECTIVE: The aim of this pilot project was to explore the extent to which judgments made by psychiatrist examiners accord with those of patients in postgraduate clinical examinations, so as to inform further consideration of the role of patients in such assessments. METHOD: Senior psychiatrist examiners (N=8) and patients (N=30) rated 16 aspects of trainee psychiatrist interviewing style and performance during 30 observed clinical interviews (OCIs) conducted in the format of official examinations. RESULTS: Significant differences were apparent in the judgments of examiners and patients regarding 7 of 16 rated aspects of trainee performance. Differences were evident largely in domains in which patients could be expected to be "expert," reflecting their subjective experience of the interviewer. By contrast, there was little difference in the judgments of patients and examiners on the more technical criteria. CONCLUSION: These preliminary findings provide some challenge to the assumption that psychiatrists are the best judges of the "technical" skills and knowledge required by the profession. They support previous findings, with simulated patients, of the discrepancy between patient and examiner judgments of the more subjective elements of the examination. Psychiatric patients could contribute to clinical examinations as co-examiners, rather than merely constituting the substrate for the examination.


Assuntos
Competência Clínica/normas , Avaliação Educacional/métodos , Entrevista Psicológica/normas , Pacientes , Adulto , Idoso , Comunicação , Avaliação Educacional/normas , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Simulação de Paciente , Relações Médico-Paciente , Projetos Piloto
10.
Aust N Z J Psychiatry ; 45(7): 569-77, 2011 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-21718125

RESUMO

OBJECTIVES: The aim of this study was to examine the role of supervision during psychiatric training in ensuring that registrars are adequately trained to meet the standards of the RANZCP examinations and to consider the implications for improving examination pass rates. METHOD: Audiotaped recordings of 50 h of supervision involving six supervisors and thirteen trainees, obtained 2000-2003, were transcribed and analysed thematically in a qualitative study, informed by a postmodern, foucaultian perspective. RESULTS: Until an examination loomed, supervisors rarely required evidence of theoretical study or structured case presentations from their trainees. The examination and the examiners served to justify the supervisors requiring such discipline. This enabled the supervisors to remain in a supportive role, while requiring higher standards from trainees. Paradoxically, while requiring higher standards 'for the exam', trainees were told that the examiners expected nothing more than 'good psychiatric practice'. In presenting cases, the attributes of prioritization, thoughtfulness, conciseness and good timing were valued, as reported in both undergraduate and other postgraduate medical training. CONCLUSIONS: Much of supervision bore little relationship to preparation for college examinations until these were imminent. While the daily practice of trainees and supervisors continues to be at variance with the practices required to pass the examination (reflected by reference to 'exam-style' and 'non-exam style' presentations) the pass rates will remain low. If we believe that the standard set in the examination is that required of a practising psychiatrist, change is required to supervision and daily practice standards to reflect these standards.


Assuntos
Educação de Pós-Graduação em Medicina/métodos , Psiquiatria/educação , Sociedades Médicas/normas , Feminino , Humanos , Masculino , Organização e Administração
11.
Artigo em Inglês | MEDLINE | ID: mdl-33919920

RESUMO

Primary producers face considerable risks for poor mental health. While this population can be difficult to engage in programs to prevent poor mental health, approaches tailored to reflect the context of primary producers' life and work have been successful. This paper reports on the co-design phase of a project designed to prevent poor mental health for primary producers-specifically, the advantages, challenges and considerations of translating face-to-face co-design methods to an online environment in response to COVID-19 restrictions. The co-design phase drew upon the existing seven-step co-design framework developed by Trischler and colleagues. Online methods were adopted for all steps of the process. This paper models how this co-design approach can work in an online, primary producer context and details key considerations for future initiatives of this type. The development of online co-design methods is an important additional research method for use not only during a pandemic but also when operating with limited resources or geographic constraints. Results demonstrate the following: (i) co-designing online is possible given adequate preparation, training and resource allocation; (ii) "hard to reach" populations can be engaged using online methods providing there is adequate early-stage relationship building; (iii) co-design quality need not be compromised and may be improved when translating to online; and (iv) saved costs and resources associated with online methods can be realigned towards intervention/service creation, promotion and user engagement. Suggestions for extending Trischler and colleagues' model are incorporated.


Assuntos
COVID-19 , Austrália , Humanos , Saúde Mental , Pandemias , SARS-CoV-2
12.
Med Educ ; 44(8): 805-13, 2010 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-20633220

RESUMO

OBJECTIVES: This study aimed to examine the nature and extent of use of the social networking service Facebook by young medical graduates, and their utilisation of privacy options. METHODS: We carried out a cross-sectional survey of the use of Facebook by recent medical graduates, accessing material potentially available to a wider public. Data were then categorised and analysed. Survey subjects were 338 doctors who had graduated from the University of Otago in 2006 and 2007 and were registered with the Medical Council of New Zealand. Main outcome measures were Facebook membership, utilisation of privacy options, and the nature and extent of the material revealed. RESULTS: A total of 220 (65%) graduates had Facebook accounts; 138 (63%) of these had activated their privacy options, restricting their information to 'Friends'. Of the remaining 82 accounts that were more publicly available, 30 (37%) revealed users' sexual orientation, 13 (16%) revealed their religious views, 35 (43%) indicated their relationship status, 38 (46%) showed photographs of the users drinking alcohol, eight (10%) showed images of the users intoxicated and 37 (45%) showed photographs of the users engaged in healthy behaviours. A total of 54 (66%) members had used their accounts within the last week, indicating active use. CONCLUSIONS: Young doctors are active members of Facebook. A quarter of the doctors in our survey sample did not use the privacy options, rendering the information they revealed readily available to a wider public. This information, although it included some healthy behaviours, also revealed personal information that might cause distress to patients or alter the professional boundary between patient and practitioner, as well as information that could bring the profession into disrepute (e.g. belonging to groups like 'Perverts united'). Educators and regulators need to consider how best to advise students and doctors on societal changes in the concepts of what is public and what is private.


Assuntos
Internet/estatística & dados numéricos , Médicos/psicologia , Privacidade , Competência Profissional , Adulto , Estudos Transversais , Feminino , Humanos , Masculino , Nova Zelândia
13.
Nucleic Acid Ther ; 30(2): 117-128, 2020 04.
Artigo em Inglês | MEDLINE | ID: mdl-32027209

RESUMO

The prognosis for breast cancer patients diagnosed with brain metastases is poor, with survival time measured merely in months. This can largely be attributed to the limited treatment options capable of reaching the tumor as a result of the highly restrictive blood-brain barrier (BBB). While methods of overcoming this barrier have been developed and employed with current treatment options, the majority are highly invasive and nonspecific, leading to severe neurotoxic side effects. A novel approach to address these issues is the development of therapeutics targeting receptor-mediated transport mechanisms on the BBB endothelial cell membranes. Using this approach, we intercalated doxorubicin (DOX) into a bifunctional aptamer targeting the transferrin receptor on the BBB and epithelial cell adhesion molecule (EpCAM) on metastatic cancer cells. The ability of the DOX-loaded aptamer to transcytose the BBB and selectively deliver the payload to EpCAM-positive tumors was evaluated in an in vitro model and confirmed for the first time in vivo using the MDA-MB-231 breast cancer metastasis model (MDA-MB-231Br). We show that colocalized aptamer and DOX are clearly detectable within the brain lesions 75 min postadministration. Collectively, results from this study demonstrate that through intercalation of a cytotoxic drug into the bifunctional aptamer, a therapeutic delivery vehicle can be developed for specific targeting of EpCAM-positive brain metastases.


Assuntos
Antígenos CD/genética , Neoplasias Encefálicas/tratamento farmacológico , Neoplasias da Mama/tratamento farmacológico , Doxorrubicina/farmacologia , Molécula de Adesão da Célula Epitelial/genética , Receptores da Transferrina/genética , Animais , Aptâmeros de Nucleotídeos/genética , Aptâmeros de Nucleotídeos/farmacologia , Barreira Hematoencefálica/efeitos dos fármacos , Neoplasias Encefálicas/genética , Neoplasias Encefálicas/patologia , Neoplasias da Mama/genética , Neoplasias da Mama/patologia , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Molécula de Adesão da Célula Epitelial/antagonistas & inibidores , Feminino , Humanos , Camundongos , Receptores da Transferrina/antagonistas & inibidores
14.
Biochimie ; 145: 34-44, 2018 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-29224849

RESUMO

Current therapy for ovarian cancer typically involves indiscriminate chemotherapies that can have severe off target effects on healthy tissue and are still plagued by aggressive recurrence. Recent shifts towards targeted therapies offer the possibility of circumventing the obstacles experienced by these traditional treatments. While antibodies are the pioneering agents in targeted therapies, clinical experience has demonstrated that their antitumor efficacy is limited due to their high immunogenicity, large molecular size, and costly and laborious production. In contrast, nucleic acid based chemical antibodies, also known as aptamers, are ideal for this application given their small size, lack of immunogenicity and in vitro production. As aptamers have begun to demonstrate their promise through targeting Epithelial Cell Adhesion Molecule (EpCAM), as well as a number of ovarian cancer biomarkers, in in vivo and in vitro models, their clinical applicability is slowly being realised. This review explores some of the current progress of aptamers targeting cancer biomarkers and their potential role as ovarian cancer therapeutics.


Assuntos
Antineoplásicos/uso terapêutico , Aptâmeros de Nucleotídeos/uso terapêutico , Molécula de Adesão da Célula Epitelial/antagonistas & inibidores , Proteínas de Neoplasias/antagonistas & inibidores , Neoplasias Ovarianas/tratamento farmacológico , Animais , Antineoplásicos/química , Aptâmeros de Nucleotídeos/química , Molécula de Adesão da Célula Epitelial/metabolismo , Feminino , Humanos , Proteínas de Neoplasias/metabolismo
15.
Pharmaceuticals (Basel) ; 12(1)2018 Dec 24.
Artigo em Inglês | MEDLINE | ID: mdl-30586898

RESUMO

Cancer has a high incidence and mortality rate worldwide, which continues to grow as millions of people are diagnosed annually. Metastatic disease caused by cancer is largely responsible for the mortality rates, thus early detection of metastatic tumours can improve prognosis. However, a large number of patients will also present with micrometastasis tumours which are often missed, as conventional medical imaging modalities are unable to detect micrometastases due to the lack of specificity and sensitivity. Recent advances in radiochemistry and the development of nucleic acid based targeting molecules, have led to the development of novel agents for use in cancer diagnostics. Monoclonal antibodies may also be used, however, they have inherent issues, such as toxicity, cost, unspecified binding and their clinical use can be controversial. Aptamers are a class of single-stranded RNA or DNA ligands with high specificity, binding affinity and selectivity for a target, which makes them promising for molecular biomarker imaging. Aptamers are presented as being a superior choice over antibodies because of high binding affinity and pH stability, amongst other factors. A number of aptamers directed to cancer cell markers (breast, lung, colon, glioblastoma, melanoma) have been radiolabelled and characterised to date. Further work is ongoing to develop these for clinical applications.

16.
Cancers (Basel) ; 10(1)2018 Jan 12.
Artigo em Inglês | MEDLINE | ID: mdl-29329202

RESUMO

The epithelial cell adhesion molecule (EpCAM), or CD326, was one of the first cancer associated biomarkers to be discovered. In the last forty years, this biomarker has been investigated for use in personalized cancer therapy, with the first monoclonal antibody, edrecolomab, being trialled in humans more than thirty years ago. Since then, several other monoclonal antibodies have been raised to EpCAM and tested in clinical trials. However, while monoclonal antibody therapy has been investigated against EpCAM for almost 40 years as primary or adjuvant therapy, it has not shown as much promise as initially heralded. In this review, we look at the reasons why and consider alternative targeting options, such as aptamers, to turn this almost ubiquitously expressed epithelial cancer biomarker into a viable target for future personalized therapy.

17.
ACS Chem Neurosci ; 8(4): 777-784, 2017 04 19.
Artigo em Inglês | MEDLINE | ID: mdl-28010059

RESUMO

The treatment of brain disorders is greatly hindered by the presence of the blood-brain barrier, which restricts the overwhelming majority of small molecules from entering the brain. A novel approach by which to overcome this barrier is to target receptor mediated transport mechanisms present on the endothelial cell membranes. Therefore, we fused an aptamer that binds to epithelial cell adhesion molecule-expressing cancer cells to an aptamer targeting the transferrin receptor. This generated a proof of concept bifunctional aptamer that can overcome the blood-brain barrier and potentially specifically target brain disorders. The initial fusion of the two sequences enhanced the binding affinity of both aptamers while maintaining specificity. Additionally, mutations were introduced into both binding loops to determine their effect on aptamer specificity. The ability of the aptamer to transcytose the blood-brain barrier was then confirmed in vivo following a 1 nmol injection. This study has shown that through the fusion of two aptamer sequences, a bifunctional aptamer can be generated that has the potential to be developed for the specific treatment of brain disorders.


Assuntos
Aptâmeros de Nucleotídeos/farmacologia , Sistemas de Liberação de Medicamentos/métodos , Molécula de Adesão da Célula Epitelial , Receptores da Transferrina , Animais , Aptâmeros de Nucleotídeos/síntese química , Aptâmeros de Nucleotídeos/química , Barreira Hematoencefálica , Neoplasias Encefálicas/tratamento farmacológico , Linhagem Celular , Humanos , Camundongos Endogâmicos NOD , Camundongos SCID , Microscopia Confocal , Metástase Neoplásica/tratamento farmacológico , Transcitose
18.
Soc Sci Med ; 152: 35-40, 2016 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-26829007

RESUMO

Food insecurity is widely reported to be at a crisis level in the Inuit territory of Nunavut, Canada. Various policies, programs, and initiatives have been proposed to tackle the problem, with increasing interest in developing a system of country food markets (CFMs) similar to Greenland. We examine if CFMs offer a feasible, sustainable, and effective model for strengthening food systems in Nunavut, examining the model of Greenland and drawing on semi-structured interviews with key informants (n = 45). The Greenland experience indicates that CFMs can provide access to sufficient, safe, and nutritious food on a regular basis, and can diversify locally available foods. These benefits are transferable to Nunavut, although knowledge gaps, regulatory and institutional conditions, and concerns over how CFMs might affect the cultural basis of food systems, underlies apprehension over their development in the territory. We conclude that Nunavut is not currently in the position to develop CFMs, but the role of such markets in potentially strengthening food systems should not be discounted. Future development would need to solicit community input on CFMs, resolve regulatory issues around wildlife management and harvesting, and study how future risks would affect sustainability and effectiveness.


Assuntos
Comércio , Política Nutricional , Abastecimento de Alimentos , Humanos , Nunavut , Papel (figurativo)
19.
Nucleic Acid Ther ; 26(3): 120-6, 2016 06.
Artigo em Inglês | MEDLINE | ID: mdl-26862683

RESUMO

Immunohistochemistry has helped to make surgical pathology the "gold" standard for tumor diagnosis. However, given the numerous problems associated with the use of antibodies for the staining of cellular markers in paraffin-embedded tissues, there is a requirement for novel agents that have the advantages of antibodies, but with few of the disadvantages. Aptamers, which are chemical antibodies, are highly specific and sensitive, like their protein counterparts, but display few of the disadvantages. These molecules represent a unique reagent that has the potential to revolutionize the field of histopathological diagnostics. In this study, we present a review of some of the aptamers that have been validated for use in diagnoses and suggest some of the advantages to using these molecules in the future.


Assuntos
Anticorpos/genética , Aptâmeros de Nucleotídeos/genética , Neoplasias/genética , Técnica de Seleção de Aptâmeros/tendências , Anticorpos/uso terapêutico , Humanos , Imuno-Histoquímica/tendências , Neoplasias/diagnóstico , Inclusão em Parafina
20.
Nucleic Acid Ther ; 26(6): 348-354, 2016 12.
Artigo em Inglês | MEDLINE | ID: mdl-27500826

RESUMO

Aptamers are proving their utility in a number of applications. However, to be easily functionalized, their structure needs to be simplified. Therefore, we sought to truncate a 50-nucleotide aptamer specific to the transferrin receptor to its smallest functional unit using rational engineering of the predicted two-dimensional structure of the longer parent sequence. In addition, mutations were introduced into the binding loop to determine their effect on the selectivity of the aptamers. These base mutations enhanced the binding affinity of the aptamer, while retaining its specificity. The equilibrium dissociation constant (Kd) was reduced sixfold following the substitution of all four bases in the binding region. In addition, these aptamers were efficiently internalized into transferrin receptor-positive cells in a similar manner to the transferrin receptor antibody and demonstrated colocalization with this antibody. This study has shown that the smallest functional unit of this aptamer was 14 nucleotides. This small size will be advantageous for future applications, such as drug delivery or functionalization of other therapeutic modalities.


Assuntos
Aptâmeros de Nucleotídeos/metabolismo , Mutação , Receptores da Transferrina/metabolismo , Técnica de Seleção de Aptâmeros , Animais , Aptâmeros de Nucleotídeos/síntese química , Aptâmeros de Nucleotídeos/genética , Pareamento de Bases , Sequência de Bases , Linhagem Celular , Linhagem Celular Tumoral , Endocitose , Células Endoteliais/citologia , Células Endoteliais/metabolismo , Expressão Gênica , Humanos , Cinética , Linfócitos/citologia , Linfócitos/metabolismo , Camundongos , Conformação de Ácido Nucleico , Receptores da Transferrina/genética
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