Multiplexed Sub-Cellular Scale Microarrays from direct DNA Nanolithography

The multiplexed, high-throughput fabrication of microarrays is of vital importance for many applications in life sciences, including drug screening, medical diagnostics and cell biology. In single cell investigations, features smaller than 10 μm are needed for functional manipulation of sub-cellular structures. Several top-down methodologies like electron beam lithography and microcontact printing can be employed for indirect surface patterning at this scale, however those approaches often require clean rooms and multiplexing of several different biomolecules on the same surface is limited [1]. To overcome these obstacles, we combined Dip-pen nanolithography (DPN) and DNA-directed immobilization (DDI) of proteins to fabricate cell-compatible functionalized glass surfaces [2]. We optimized ink formulation for ssDNA printing and the produced arrays were then functionalized with epidermal growth factor (EGF) taking advantage of covalent ssDNA-streptavidin conjugates as adaptor molecules. The surface-immobilized EGF was used for recruiting EGFR in the plasma membrane of MCF7 cells. Via this bottom-up structuring approach, we were able to analyse multiple protein-protein interactions simultaneously in individual living cells [3]. To improve the efficiency of multiplexed surface patterning, we developed a prototype of a robust custom plotter based on 2D polymer-pen lithography (2D-PPL) [4]. This device enables rapid fabrication of microarrays at ambient conditions in a multiplexed direct-writing mode. The printing process was carried out by polymeric pyramidal pens onto which multiple (up to 36) ssDNA solutions can be loaded through a microfluidic inkwell device. Subsequent to optimization of ink viscosity and surface tension by glycerol and tween-20, DNA arrays were plotted and used for DDI of EGF-bearing ssDNA-streptavidin conjugates. The resulting microarrays covered areas of about 0.5 cm2, and were capable of recruiting and activating EGF receptors in sub-cellular regions within human MCF7 cells [4]. References [1] G. Arrabito, B. Pignataro. 2012. Solution Processed Micro- and Nano- Bioarrays for Multiplexed Biosensing. Anal. Chem. 84:5450–5462. [2] G. Arrabito et al. 2013. Biochips for Cell Biology by Combined Dip-Pen Nanolithography and DNA-Directed Protein Immobilization. Small. 9:4243-4249. [3] S. Gandor et al. 2013. A Protein-Interaction Array Inside a Living Cell. Angew. Chem. Int. Ed. Engl. 52:4790–4794. [4] G. Arrabito, et al. 2014. Low-cost Plotter Device for Sub-Cellular Scale Microarray Fabrication. Small. DOI: 10.1002/smll.201303390

Family-Based Treatments for Serious Juvenile Offenders: A Multilevel Meta-Analysis

OBJECTIVE: Researchers have identified several family-based treatments that hold considerable promise in reducing serious juvenile offending; however, these treatments remain underutilized by youth service systems. In the present study, we used meta-analysis to summarize the findings of research on family-based treatments for serious juvenile offenders. METHOD: We conducted a multilevel meta-analysis that modeled dependencies between multiple effect sizes from the same study. The meta-analysis synthesized 324 effect sizes from 28 studies that met inclusion criteria. Potential moderators (e.g., characteristics of samples, treatments, methods, and measures) were entered as fixed effects in the meta-analytic model. RESULTS: Across studies, family-based treatments produced modest, yet long-lasting, treatment effects (mean d = 0.25 for antisocial behavior, 0.24 overall) relative to comparison conditions. Furthermore, certain characteristics moderated the magnitude of treatment effects; for example, measures of substance use showed the largest effects and measures of peer relationships showed the smallest effects. CONCLUSIONS: Policymakers, administrators, and treatment providers may find it useful to consider the effects of family-based treatments for serious juvenile offenders in their selection of treatments for this population. In addition, investigators who seek to develop and study such treatments may wish to consider the current findings in their future research efforts. (PsycINFO Database Recordstatus: publishe

Are We Getting Value for Money from Behavioral Interventions for Offenders? A Research Note Reviewing the Economic Evaluation Literature

© 2017 Southern Criminal Justice Association Public expenditure on the criminal justice system represents a significant fiscal burden to government worldwide, making the economic evaluation of interventions aimed at improving justice outcomes critical to informing resource allocation. This study systematically reviews and assesses the scope and quality of economic evaluations of behavioral interventions aimed at reducing reoffending. Only seventeen studies met the inclusion criteria, with wide variation in methodological approaches, including differences in costing perspectives, study design, and the definition of cost and outcome measures. The majority of behavioral interventions for offenders remain unevaluated from an economic perspective, representing a significant evidence gap for informing cost-effective and efficient allocation decision. Based on the studies reviewed, economic benefit can be derived from investing in offender behavioral programs. However, whether this investment represents ‘value for money’ remains unclear. What is clear is that economic evaluations in the justice health sector lag behind research in other areas of public policy