Edible bio-based nanostructures: delivery, absorption and potential toxicity

The development of bio-based nanostructures as nanocarriers of bioactive compounds to specific body sites has been presented as a hot topic in food, pharmaceutical and nanotechnology fields. Food and pharmaceutical industries seek to explore the huge potential of these nanostructures, once they can be entirely composed of biocompatible and non-toxic materials. At the same time, they allow the incorporation of lipophilic and hydrophilic bioactive compounds protecting them against degradation, maintaining its active and functional performance. Nevertheless, the physicochemical properties of such structures (e.g., size and charge) could change significantly their behavior in the gastrointestinal (GI) tract. The main challenges in the development of these nanostructures are the proper characterization and understanding of the processes occurring at their surface, when in contact with living systems. This is crucial to understand their delivery and absorption behavior as well as to recognize potential toxicological effects. This review will provide an insight into the recent innovations and challenges in the field of delivery via GI tract using bio-based nanostructures. Also, an overview of the approaches followed to ensure an effective deliver (e.g., avoiding physiological barriers) and to enhance stability and absorptive intestinal uptake of bioactive compounds will be provided. Information about nanostructures potential toxicity and a concise description of the in vitro and in vivo toxicity studies will also be given.Joana T. Martins, Oscar L. Ramos, Ana C. Pinheiro, Ana I. Bourbon, Helder D. Silva and Miguel A. Cerqueira (SFRH/BPD/89992/2012, SFRH/BPD/80766/2011, SFRH/BPD/101181/2014, SFRH/BD/73178/2010, SFRH/BD/81288/2011, and SFRH/BPD/72753/2010, respectively) are the recipients of a fellowship from the Fundacao para a Ciencia e Tecnologia (FCT, POPH-QREN and FSE, Portugal). The authors thank the FCT Strategic Project PEst-OE/EQB/LA0023/2013 and the project "BioInd-Biotechnology and Bioengineering for improved Industrial and Agro-Food processes," REF.NORTE-07-0124-FEDER-000028, co-funded by the Programa Operacional Regional do Norte (ON.2-O Novo Norte), QREN, FEDER. We also thank to the European Commission: BIOCAPS (316265, FP7/REGPOT-2012-2013.1) and Xunta de Galicia: Agrupamento INBIOMED (2012/273) and Grupo con potencial de crecimiento. The support of EU Cost Action FA1001 is gratefully acknowledged

The iPeer2Peer Program: a pilot randomized controlled trial in adolescents with Juvenile Idiopathic Arthritis

BACKGROUND: Adolescents with Juvenile Idiopathic Arthritis (JIA) are at risk for physical, emotional, social and role challenges that negatively impact quality of life. Peer mentoring has been shown to improve positive health behaviours in adolescents with chronic disease while simultaneously providing social support. The objectives of this paper are to examine the feasibility and acceptability of an online peer mentoring program (iPeer2Peer Program) for adolescents with JIA. METHODS: The iPeer2Peer program was examined using a waitlist pilot randomized control trial (RCT). Participants were randomly allocated to the intervention or wait-list control group via a secure, web-based randomization service. Health care providers and investigators were blinded to participant group allocation. Trained peer mentors (16–25 years; successfully managing their JIA) were matched to participants (12–18 years; diagnosed with JIA) randomized to the intervention group to provide peer support and education for effective self-management of JIA. Participant-mentor pairings connected ten times over 8 weeks using Skype video calls. Primary outcomes focused on implementation (i.e. measures of feasibility and acceptability). Secondary outcomes focused on effectiveness (i.e. measures of self-management, self-efficacy, pain, social support and quality of life). RESULTS: Thirty adolescents (mean age 14.3 ± 1.7 years, 97 % female) completed the RCT (intervention n = 16, control n = 14). Primary outcomes: One third (32 %) of adolescents approached agreed to participate, completed baseline measures and were randomized. Half of pairings completed ten calls within 8 weeks. Average call length was twice the required amount with call lengths of 44.72 ± 15.76 min. Participants reported satisfaction with the program and all reported that they would recommend it to their peers. Participants’ mean engagement level with the program was 8.53/10 (range = 7–10). Secondary outcomes: Participants who completed the iPeer2Peer Program demonstrated improvements in their perceived ability to manage JIA (p < 0.04), compared to controls. No adverse events were reported. CONCLUSION: The iPeer2Peer Program is a promising intervention that improves acceptability of self-management and peer support treatments for adolescents with JIA. By using the Internet to connect mentors to adolescents with JIA it may also improve accessibility to these resources. Findings will be used to adapt the program and refine the methodology for a full-scale RCT. TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT01986400. Registered November 11, 2013

Probing Real Sensory Worlds of Receivers with Unsupervised Clustering

The task of an organism to extract information about the external environment from sensory signals is based entirely on the analysis of ongoing afferent spike activity provided by the sense organs. We investigate the processing of auditory stimuli by an acoustic interneuron of insects. In contrast to most previous work we do this by using stimuli and neurophysiological recordings directly in the nocturnal tropical rainforest, where the insect communicates. Different from typical recordings in sound proof laboratories, strong environmental noise from multiple sound sources interferes with the perception of acoustic signals in these realistic scenarios. We apply a recently developed unsupervised machine learning algorithm based on probabilistic inference to find frequently occurring firing patterns in the response of the acoustic interneuron. We can thus ask how much information the central nervous system of the receiver can extract from bursts without ever being told which type and which variants of bursts are characteristic for particular stimuli. Our results show that the reliability of burst coding in the time domain is so high that identical stimuli lead to extremely similar spike pattern responses, even for different preparations on different dates, and even if one of the preparations is recorded outdoors and the other one in the sound proof lab. Simultaneous recordings in two preparations exposed to the same acoustic environment reveal that characteristics of burst patterns are largely preserved among individuals of the same species. Our study shows that burst coding can provide a reliable mechanism for acoustic insects to classify and discriminate signals under very noisy real-world conditions. This gives new insights into the neural mechanisms potentially used by bushcrickets to discriminate conspecific songs from sounds of predators in similar carrier frequency bands

Global features of the Alcanivorax borkumensis SK2 genome

The global feature of the completely sequenced Alcanivorax borkumensis SK2 type strain chromosome is its symmetry and homogeneity. The origin and terminus of replication are located opposite to each other in the chromosome and are discerned with high signal to noise ratios by maximal oligonucleotide usage biases on the leading and lagging strand. Genomic DNA structure is rather uniform throughout the chromosome with respect to intrinsic curvature, position preference or base stacking energy. The orthologs and paralogs of A. borkumensis genes with the highest sequence homology were found in most cases among γ-Proteobacteria, with Acinetobacter and P. aeruginosa as closest relatives. A. borkumensis shares a similar oligonucleotide usage and promoter structure with the Pseudomonadales. A comparatively low number of only 18 genome islands with atypical oligonucleotide usage was detected in the A. borkumensis chromosome. The gene clusters that confer the assimilation of aliphatic hydrocarbons, are localized in two genome islands which were probably acquired from an ancestor of the Yersinia lineage, whereas the alk genes of Pseudomonas putida still exhibit the typical Alcanivorax oligonucleotide signature indicating a complex evolution of this major hydrocarbonoclastic trait