Exploitation of Engineered Light-Switchable Myosin XI for Nanotechnological Applications.

For certain nanotechnological applications of the contractile proteins actin and myosin, e.g., in biosensing and network-based biocomputation, it would be desirable to temporarily switch on/off motile function in parts of nanostructured devices, e.g., for sorting or programming. Myosin XI motor constructs, engineered with a light-switchable domain for switching actin motility between high and low velocities (light-sensitive motors (LSMs) below), are promising in this regard. However, they were not designed for use in nanotechnology, where longevity of operation, long shelf life, and selectivity of function in specific regions of a nanofabricated network are important. Here, we tested if these criteria can be fulfilled using existing LSM constructs or if additional developments will be required. We demonstrated extended shelf life as well as longevity of the actin-propelling function compared to those in previous studies. We also evaluated several approaches for selective immobilization with a maintained actin propelling function in dedicated nanochannels only. Whereas selectivity was feasible using certain nanopatterning combinations, the reproducibility was not satisfactory. In summary, the study demonstrates the feasibility of using engineered light-controlled myosin XI motors for myosin-driven actin transport in nanotechnological applications. Before use for, e.g., sorting or programming, additional work is however needed to achieve reproducibility of the nanofabrication and, further, optimize the motor properties.

Nanolithographic Fabrication Technologies for Network-Based Biocomputation Devices.

Network-based biocomputation (NBC) relies on accurate guiding of biological agents through nanofabricated channels produced by lithographic patterning techniques. Here, we report on the large-scale, wafer-level fabrication of optimized microfluidic channel networks (NBC networks) using electron-beam lithography as the central method. To confirm the functionality of these NBC networks, we solve an instance of a classical non-deterministic-polynomial-time complete ("NP-complete") problem, the subset-sum problem. The propagation of cytoskeletal filaments, e.g., molecular motor-propelled microtubules or actin filaments, relies on a combination of physical and chemical guiding along the channels of an NBC network. Therefore, the nanofabricated channels have to fulfill specific requirements with respect to the biochemical treatment as well as the geometrical confienement, with walls surrounding the floors where functional molecular motors attach. We show how the material stack used for the NBC network can be optimized so that the motor-proteins attach themselves in functional form only to the floor of the channels. Further optimizations in the nanolithographic fabrication processes greatly improve the smoothness of the channel walls and floors, while optimizations in motor-protein expression and purification improve the activity of the motor proteins, and therefore, the motility of the filaments. Together, these optimizations provide us with the opportunity to increase the reliability of our NBC devices. In the future, we expect that these nanolithographic fabrication technologies will enable production of large-scale NBC networks intended to solve substantially larger combinatorial problems that are currently outside the capabilities of conventional software-based solvers.

Solving Exact Cover Instances with Molecular-Motor-Powered Network-Based Biocomputation.

Information processing by traditional, serial electronic processors consumes an ever-increasing part of the global electricity supply. An alternative, highly energy efficient, parallel computing paradigm is network-based biocomputation (NBC). In NBC a given combinatorial problem is encoded into a nanofabricated, modular network. Parallel exploration of the network by a very large number of independent molecular-motor-propelled protein filaments solves the encoded problem. Here we demonstrate a significant scale-up of this technology by solving four instances of Exact Cover, a nondeterministic polynomial time (NP) complete problem with applications in resource scheduling. The difficulty of the largest instances solved here is 128 times greater in comparison to the current state of the art for NBC.

Occipital Nerve Stimulation in Chronic Migraine: The Relationship Between Perceived Sensory Quality, Perceived Sensory Location, and Clinical Efficacy-A Prospective, Observational, Non-Interventional Study.

INTRODUCTION: Occipital nerve stimulation (ONS) is used to treat therapy-resistant chronic migraine. Clinical use has resulted in a wide intraindividual and interindividual variation of clinical efficacy. The aim of this study was to analyze a potential relationship between sociodemographic variables, headache parameters, perceived sensory quality, perceived sensory location, as well as clinical efficacy. METHODS: Thirty-two subjects (21.9% male, mean age 45.77 years) suffering from chronic migraine refractory to other treatment and therefore treated with ONS were included in this study. We used a computer-based imaging method for mapping the ONS-induced perceived sensory location, the perceived spatial sensory field size, as well as the perceived sensory quality in a long-term course over 21 months in weekly time intervals. Additionally, the effect of ONS on the migraine headache was documented weekly by the participants using a verbal rating scale. Over the observation period, a total of 808 individual weekly data sets were recorded and a potential relationship between ONS-induced perceptions and headache parameters could be analyzed. RESULTS: We found that 48.9% of stimulation intervals were reported as effective by patients. Women displayed a significantly higher responder rate than men. The reported effectiveness did not differ depending on age, the average number of migraine days per month, the MIDAS score, or the duration of the migraine disorder prior to ONS treatment. Implantation with trial period led to significantly lower responder rates than without the trial period. The most frequently perceived sensory quality of "tingling" was found significantly more frequently in non-responders than in responders. Responders displayed significantly lower pleasantness scores for their reported perceptions than non-responders. Sensations that were spatially perceived above the line connecting the external acoustic meati with the external occipital protuberance (MOP line) led to patients reporting a positive clinical effect significantly more frequently than sensations spatially perceived below the MOP line. Spatially small fields of sensory perception were correlated with a higher responder rate than those covering broader areas. CONCLUSIONS: The ONS-induced sensory location, the size of the spatial sensory field, as well as the sensory quality are significantly correlated with the reported clinical effectiveness. The results suggest that besides surgical technique, the individual and continuous programming of the stimulation parameters is clinically relevant in increasing the therapeutic effectiveness.

Imaging sensory effects of occipital nerve stimulation: a new computer-based method in neuromodulation.

BACKGROUND: Within the last years, occipital nerve stimulation (ONS) has proven to be an important method in the treatment of severe therapy-resistant neurological pain disorders. The correspondence between lead placement as well as possible stimulation parameters and the resulting stimulation effects remains unclear. OBJECTIVE: The method aims to directly relate the neuromodulatory mechanisms with the clinical treatment results, to achieve insight in the mode of action of neuromodulation, to identify the most effective stimulation sets and to optimize individual treatment effects. METHODS: We describe a new computer-based imaging method for mapping the spatial, cognitive and affective sensory effects of ONS. The procedure allows a quantitative and qualitative analysis of the relationship between lead positioning, the stimulation settings as well as the sensory and clinical stimulation effects. CONCLUSION: A regular mapping of stimulation and sensory parameters allows a coordinated monitoring. The stimulation results can be reviewed and compared with regards to clinical effectiveness.

Overview of the Publications From the Anthroposophic Medicine Outcomes Study (AMOS): A Whole System Evaluation Study.

Anthroposophic medicine is a physician-provided complementary therapy system that was founded by Rudolf Steiner and Ita Wegman. Anthroposophic therapy includes special medicinal products, artistic therapies, eurythmy movement exercises, and special physical therapies. The Anthroposophic Medicine Outcomes Study (AMOS) was a prospective observational multicenter study of 1631 outpatients starting anthroposophic therapy for anxiety disorders, asthma, attention deficit hyperactivity disorder, depression, low back pain, migraine, and other chronic indications under routine conditions in Germany. AMOS INCORPORATED TWO FEATURES PROPOSED FOR THE EVALUATION OF INTEGRATIVE THERAPY SYSTEMS: (1) a sequential approach, starting with the whole therapy system (use, safety, outcomes, perceived benefit), addressing comparative effectiveness and proceeding to the major system components (physician counseling, anthroposophic medicinal products, art therapy, eurythmy therapy, rhythmical massage therapy) and (2) a mix of different research methods to build an information synthesis, including pre-post analyses, prospective comparative analyses, economic analyses, and safety analyses of individual patient data. AMOS fostered two methodological innovations for the analysis of single-arm therapy studies (combined bias suppression, systematic outcome comparison with corresponding cohorts in other studies) and the first depression cost analysis worldwide comparing primary care patients treated for depression vs depressed patients treated for another disorder vs nondepressed patients. A total of 21 peer-reviewed publications from AMOS have resulted. This article provides an overview of the main research questions, methods, and findings from these publications: anthroposophic treatment was safe and was associated with clinically relevant improvements in symptoms and quality of life without cost increase; improvements were found in all age, diagnosis, and therapy modality groups and were retained at 48-month follow-up; nonrespondent bias, natural recovery, regression to the mean, and adjunctive therapies together could explain a maximum of 37% of the improvement.

La medicina antroposófica es un sistema terapéutico complementario proporcionado por el médico que fue fundada por Rudolf Steiner e Ita Wegman. La terapia antroposófica incluye productos medicinales especiales, terapias artísticas, ejercicios de movimiento eurítmico y terapias físicas especiales. El estudio de los resultados de la medicina antroposófica (Anthroposophic Medicine Outcomes Study, AMOS) consistió en un estudio prospectivo observacional multicéntrico de 1631 pacientes ambulatorios que comenzaban la terapia antroposófica para trastornos de ansiedad, asma, trastorno de hiperactividad y déficit de atención, depresión, dolor lumbar, migraña y otras indicaciones crónicas bajo condiciones rutinarias en Alemania.AMOS incorporaba dos características propuestas para la evaluación de sistemas terapéuticos integrales: (1) un enfoque secuencial, comenzando con el sistema terapéutico completo (uso, seguridad, resultados, ventaja percibida), que aborda la eficacia comparativa y continúa con los componentes principales del sistema (asesoramiento del médico, productos medicinales antroposóficos, terapia artística, terapia eurítmica, terapia de masaje rítmico) y (2) una combinación de diferentes métodos de investigación para crear una síntesis de información, que incluye análisis previos y posteriores, análisis comparativos prospectivos, análisis económicos y análisis de la seguridad de los datos del paciente individual. AMOS fomentaba dos innovaciones metodológicas para el análisis de los estudios terapéuticos de un grupo único (supresión del sesgo combinado, comparación sistemática de resultados con las cohortes correspondientes en otros estudios) y el primer análisis a nivel mundial del coste de la depresión comparando pacientes de atención primaria tratados de depresión frente a pacientes deprimidos tratados por otro trastorno frente a pacientes no deprimidos.Ha resultado en un total de 21 publicaciones revisadas por expertos de AMOS. Este artículo proporciona una visión general de las principales cuestiones de investigación, métodos y los resultados de estas publicaciones: el tratamiento antroposófico era seguro y se asociaba a mejoras clínicamente relevantes en los síntomas y la calidad de vida sin aumento de los costes; se observaron mejoras en todos los grupos de edad, diagnóstico y modalidad de terapia y se mantuvieron en el seguimiento de 48 meses; el sesgo ajeno a los entrevistados, la recuperación natural, la regresión a la media y las terapias adyuvantes juntos podían explicar un máximo del 37 % de la mejoría.

Anthroposophic therapy for attention deficit hyperactivity: a two-year prospective study in outpatients.

BACKGROUND: Anthroposophic treatment for attention deficit hyperactivity disorder (ADHD) includes special artistic and physical therapies and special medications. METHODS: We studied 61 consecutive children starting anthroposophic treatment for ADHD symptoms under routine outpatient conditions. Primary outcome was FBB-HKS (a parents' questionnaire for ADHD core symptoms, 0-3), and secondary outcomes were disease and symptom scores (physicians' and parents' assessment, 0-10) and quality of life (KINDL(®) total score, 0-100). RESULTS: A total of 67% of patients fulfilled the DSM-IV criteria for ADHD, 15% had an exclusion diagnosis such as pervasive developmental disorders, while 18% did not fulfill ADHD criteria for another reason. Anthroposophic treatment modalities used were eurythmy therapy (in 56% of patients), art therapy (20%), rhythmical massage therapy (8%), and medications (51%). From baseline to six-month follow-up, all outcomes improved significantly; average improvements were FBB-HKS total score 0.30 points (95% confidence interval [CI]: 0.18-0.43; P < 0.001), FBB-HKS inattention 0.36 (95% CI: 0.21-0.50; P < 0.001), FBB-HKS hyperactivity 0.29 (95% CI: 0.14-0.44; P < 0.001), FBB-HKS impulsivity 0.22 (95% CI: 0.03-0.40; P < 0.001), disease score 2.33 (95% CI: 1.84-2.82; P < 0.001), symptom score 1.66 (95% CI: 1.17-2.16; P < 0.001), and KINDL 5.37 (95% CI: 2.27-8.47; P = 0.001). Improvements were similar in patients not using stimulants (90% of patients at months 0-6) and were maintained until last follow-up after 24 months. CONCLUSION: Children with ADHD symptoms receiving anthroposophic treatment had long-term improvement of symptoms and quality of life.

Anthroposophic therapy for children with chronic disease: a two-year prospective cohort study in routine outpatient settings.

BACKGROUND: Many children with chronic disease use complementary therapies. Anthroposophic treatment for paediatric chronic disease is provided by physicians and differs from conventional treatment in the use of special therapies (art therapy, eurythmy movement exercises, rhythmical massage therapy) and special medications. We studied clinical outcomes in children with chronic diseases under anthroposophic treatment in routine outpatient settings. METHODS: In conjunction with a health benefit program, consecutive outpatients starting anthroposophic treatment for any chronic disease participated in a prospective cohort study. Main outcome was disease severity (Disease and Symptom Scores, physicians' and caregivers' assessment on numerical rating scales 0-10). Disease Score was documented after 0, 6, and 12 months, Symptom Score after 0, 3, 6, 12, 18, and 24 months. RESULTS: A total of 435 patients were included. Mean age was 8.2 years (standard deviation 3.3, range 1.0-16.9 years). Most common indications were mental disorders (46.2% of patients; primarily hyperkinetic, emotional, and developmental disorders), respiratory disorders (14.0%), and neurological disorders (5.7%). Median disease duration at baseline was 3.0 years (interquartile range 1.0-5.0 years). The anthroposophic treatment modalities used were medications (69.2% of patients), eurythmy therapy (54.7%), art therapy (11.3%), and rhythmical massage therapy (6.7%). Median number of eurythmy/art/massage therapy sessions was 12 (interquartile range 10-20), median therapy duration was 118 days (interquartile range 78-189 days).From baseline to six-month follow-up, Disease Score improved by average 3.00 points (95% confidence interval 2.76-3.24 points, p < 0.001) and Symptom Score improved by 2.41 points (95% confidence interval 2.16-2.66 points, p < 0.001). These improvements were maintained until the last follow-up. Symptom Score improved similarly in patients not using adjunctive non-anthroposophic therapies within the first six study months. CONCLUSION: Children under anthroposophic treatment had long-term improvement of chronic disease symptoms. Although the pre-post design of the present study does not allow for conclusions about comparative effectiveness, study findings suggest that anthroposophic therapies may play a beneficial role in the long-term care of children with chronic illness.