Tryptanthrin Analogs Substoichiometrically Inhibit Seeded and Unseeded Tau4RD Aggregation.

Microtubule-associated protein tau is an intrinsically disordered protein (IDP) that forms characteristic fibrillar aggregates in several diseases, the most well-known of which is Alzheimer's disease (AD). Despite keen interest in disrupting or inhibiting tau aggregation to treat AD and related dementias, there are currently no FDA-approved tau-targeting drugs. This is due, in part, to the fact that tau and other IDPs do not exhibit a single well-defined conformation but instead populate a fluctuating conformational ensemble that precludes finding a stable "druggable" pocket. Despite this challenge, we previously reported the discovery of two novel families of tau ligands, including a class of aggregation inhibitors, identified through a protocol that combines molecular dynamics, structural analysis, and machine learning. Here we extend our exploration of tau druggability with the identification of tryptanthrin and its analogs as potent, substoichiometric aggregation inhibitors, with the best compounds showing potencies in the low nanomolar range even at a ~100-fold molar excess of tau4RD. Moreover, conservative changes in small molecule structure can have large impacts on inhibitory potency, demonstrating that similar structure-activity relationship (SAR) principles as used for traditional drug development also apply to tau and potentially to other IDPs.

Advances in Hydrogen/Deuterium Exchange Mass Spectrometry and the Pursuit of Challenging Biological Systems.

Solution-phase hydrogen/deuterium exchange (HDX) coupled to mass spectrometry (MS) is a widespread tool for structural analysis across academia and the biopharmaceutical industry. By monitoring the exchangeability of backbone amide protons, HDX-MS can reveal information about higher-order structure and dynamics throughout a protein, can track protein folding pathways, map interaction sites, and assess conformational states of protein samples. The combination of the versatility of the hydrogen/deuterium exchange reaction with the sensitivity of mass spectrometry has enabled the study of extremely challenging protein systems, some of which cannot be suitably studied using other techniques. Improvements over the past three decades have continually increased throughput, robustness, and expanded the limits of what is feasible for HDX-MS investigations. To provide an overview for researchers seeking to utilize and derive the most from HDX-MS for protein structural analysis, we summarize the fundamental principles, basic methodology, strengths and weaknesses, and the established applications of HDX-MS while highlighting new developments and applications.

Development and initial validation of an electronic personal assessment questionnaire for menstrual, pelvic pain and gynaecological hormonal disorders (ePAQ-MPH).

OBJECTIVE: Menstrual disorders, pelvic-pain and gynaecological hormonal conditions in women can have a significant impact on quality-of-life. Reliable assessment and monitoring of these intimate conditions is challenging. Patient reported outcome measures (PROMs) can be invaluable in providing objective assessment, but no comprehensive PROM assessing all of these conditions and their impact on quality of life is currently available. The purpose of this study was to develop and undertake initial psychometric testing of a comprehensive interactive electronic patient reported outcome measure for these conditions. STUDY DESIGN: A prototype electronic PROM (ePAQ-MPH) was developed following systematic literature review, semi structured interviews with 25 patients and expert panel review. Exploratory factor analysis was undertaken in 291 women attending a menstrual-disorders clinic; establishing a domain structure and enabling item reduction. Two validated PROMS (Women's Health Questionnaire and Menstrual Distress Questionnaire) were completed to assess criterion validity in 213 patients. Test-retest reliability was carried out in 30 women completing ePAQ-MPH at least one week apart. Patients' views on 'Value' and 'Burden' were assessed in 278 women using a validated 10-item survey measuring questionnaire utility (QQ-10). Confirmatory factor analysis (CFA) of the revised version of ePAQ-MPH following item reduction was undertaken in a different sample of 254 women. RESULTS: Exploratory factor analysis identified 18 domains (Cronbach's α > 0.7) and 30 redundant items. Test-retest analysis found acceptable intra-class correlations of 0.6-0.9 (p < 0.05). Eight domains were compared with Menstrual Distress Questionnaire showing moderate or strong correlation in seven domains. Ten domains were compared with Women's Health Questionnaire, six of which showed moderate correlation. Mean QQ-10 Value and Burden scores were 76 and 25, respectively (SD=15.8 and 15.5). The mean completion time for ePAQ-MPH was 31 min. CFA of the revised version 2 instrument with 15 domains showed good model fit. CONCLUSIONS: Whilst wider psychometric testing of the revised version of ePAQ-MPH is required, including in different settings and in assessments of data quality and responsiveness, initial analysis provides some evidence for reliability, validity and acceptability of this multi-dimensional electronic PROM. ePAQ-MPH shows potential for both patient assessment and roles in service evaluation and research.

Development of Technologic Solutions to Address Complex Local Requirements of an International Prostate Cancer Clinical Quality Registry.

PURPOSE: To detail the process for importing a defined data set into a centralized global registry via a secure file transfer platform and to understand the barriers to the establishment of a centralized global registry. RESULTS: A bespoke solution was developed to allow transmission of data from international local data centers to a centralized repository. Data elements included in the import template were drawn from existing International Consortium for Health Outcome Measurement variables and refined to ensure accurate benchmarking as well as feasibility in data completeness. The data set was organized in accordance with the prostate cancer care trajectory. Key considerations in developing the data transfer platform included import file format, process of input validation, and technical provisions. Given the diversity in the legislation and ethical requirements with respect to consent, data handling, and cross-border data transfer across geographic locations, we encouraged each local data center to consult with its legal advisors and research ethics committee early on in the process. DISCUSSION: A global collaboration, although highly valuable, posed many challenges because of inconsistent methods of data collection. User acceptance of a system is paramount to the success of establishing a metaregistry. Local information technology support and regular regression testing ensures quality and maintenance of the database. CONCLUSION: We developed a Web-based system to facilitate the collection and secure storage of common data, which is scalable and secure. It is anticipated that through systematic recording of data, global standards of clinical practice and outcomes of care will see vast improvements.