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Richter D.,University of Leipzig | Koehler M.,University Medical Center Magdeburg | Friedrich M.,University of Leipzig | Hilgendorf I.,University Medical Center Jena | And 2 more authors.
Critical Reviews in Oncology/Hematology | Year: 2015

Adolescent and young adult (AYA) cancer patients experience unique psychosocial needs and developmental challenges. A cancer diagnosis can stress this development and disrupt AYAs in their normal life.The aim of this systematic review and meta-analysis was to assess the impact of psychosocial interventions on mental health in AYAs. A literature research was conducted, which resulted in twelve eligible studies.The standardized mean difference between intervention and control conditions was 0.13 (95% CI: -0.16 to 0.42) for quality of life, 0.27 (95% CI: -0.22 to 0.76) for cancer-related knowledge and -0.16 (95% CI: -0.73 to 0.42) on psychological distress indicating, small and non-significant effects for interventions improving mental health.This work strengthens the need for age-appropriated interventions in psycho-oncology. Future research should develop interventions more graduated by age. Randomized intervention studies with larger samples and focusing psychosocial outcomes are needed to establish evidence-based psycho-oncological interventions for AYAs. © 2015 Elsevier Ireland Ltd. Source


Wiegand C.,University Medical Center Jena
International journal of pharmaceutics | Year: 2013

Cationic polyamines, such as poly(ethyleneimines) (PEIs), may recommend themselves for antimicrobial applications as they can interact with microbial membranes resulting in their disruption. The purpose of the study was the assessment of biocompatibility and antibacterial activity of PEIs with different architectures (branched (b) and linear (l)) and molar masses (0.8-750 kDa). lPEI and bPEI exhibited a strong antibacterial activity against Staphylococcus aureus and Escherichia coli with a more pronounced effect on the Gram-positive bacteria. lPEIs further demonstrated a higher antibacterial efficacy compared to bPEIs but no significant differences between 5 and 25 kDa were observed. In accordance, antibacterial activity of bPEI did not specifically depend on molar mass. Only slightly lower minimal inhibitory concentrations (MIC) were observed at 5 kDa (S. aureus) and 25 kDa (E. coli) in the tests. As PEIs are compelling candidates for use in antimicrobial treatment, two basic aspects have to be investigated: treatment effectiveness and safety. PEIs clearly induced molecular weight dependent cytotoxic effects in vitro. PEIs with low molecular weight (0.8 and 5 kDa) exhibited higher biocompatibility. Nonetheless, the results confirmed a low genotoxic potential of lPEI and bPEIs. In conclusion, 2.5 kDa-lPEI and 0.8 kDa-bPEI can be recommended for use as antimicrobial polymers in dermal applications due to their high biocompatibility with concomitant antibacterial efficacy. Copyright © 2013 Elsevier B.V. All rights reserved. Source


Berndt S.,Friedrich - Schiller University of Jena | Wesarg F.,Friedrich - Schiller University of Jena | Wiegand C.,University Medical Center Jena | Kralisch D.,Friedrich - Schiller University of Jena | Muller F.A.,Friedrich - Schiller University of Jena
Cellulose | Year: 2013

The increasing resistance of pathogens and bacteria is a serious problem in the medical treatment of wounds and injuries. Therefore, new therapeutic agents are not solely based on antibiotics, but also on the use of antimicrobial metal nanoparticles. In this paper we present an innovative method to prepare porous hybrids consisting of bacterial nanocellulose (BNC) and silver nanoparticles (AgNPs). The stepwise modification is based on fairly simple chemical reactions already described for two-dimensional cellulose films. We transferred this method to the three-dimensional, porous network of BNC leading to an antimicrobial activation of its surface. Compared to former approaches, the ultrafine network structure of BNC is less damaged by using mild chemicals. The amount and distribution of the AgNPs on the modified BNC was investigated using scanning electron microscopy. The AgNPs are firmly immobilized on the top and bottom surface of the BNC by chemical interactions. Their size and quantity increase with an increasing concentration of AgNO3 and extended reaction time in the AgNO3 solution. A strong antimicrobial activity of the BNC-AgNP hybrids against Escherichia coli was detected. Furthermore, agar diffusion tests confirmed that this activity is restricted to the modified dressing itself, avoiding a release of NPs into the wound. Therefore, the produced hybrids could be potentially suited as novel antimicrobial wound dressings. © 2013 Springer Science+Business Media Dordrecht. Source


Wiegand C.,University Medical Center Jena | White R.,University of Worcester
Wound Repair and Regeneration | Year: 2013

Mechanical forces greatly influence cellular organization and behavior. Cells respond to applied stress by changes in form and composition until a suitable state is reestablished. However, without any mechanical stimuli cells stop proliferating, discontinue migration, go into cell-cycle arrest, and eventually die. Hence, one can assume that pathologies closely depending on cell migration like cancer or atherosclerosis might be governed by biophysical parameters. Moreover, mechanical cues will have fundamental effects in wound healing. Especially negative pressure wound therapy has the potential to endorse wound healing by induction of both macrodeformation (wound contraction) and microdeformation (tissue reactions at microscopic level). So far, the capacity for researchers to study the link between mechanical stimulation and biological response has been limited by the lack of instrumentation capable of stimulating the tissue in an appropriate manner. However, first reports on application of micromechanical forces to wounds elucidate the roles of cell stretch, substrate stiffness, and tissue deformation during cell proliferation and differentiation. This review deals with their findings and tries to establish a link between the current knowledge and the questions that are essential to clinicians in the field: What is the significance of mirodeformations for wound healing? Does "dead space" impede propagation of mechanical cues? How can microdeformations induce cell proliferation? What role do fibroblasts, myofibroblasts, and mesenchymal stem cells play in chronic wounds with regard to micromechanical forces? © 2013 by the Wound Healing Society. Source


Nedelko V.,Kliniken Schmieder Allensbach | Hassa T.,Kliniken Schmieder Allensbach | Hamzei F.,University Medical Center Jena | Schoenfeld M.A.,Kliniken Schmieder Allensbach | And 3 more authors.
Journal of Neurologic Physical Therapy | Year: 2012

BACKGROUND AND PURPOSE:: Both action observation (AO) and action imagery have been proposed as therapeutic options for stroke rehabilitation. Currently, it is not clear to what extent their underlying neuronal mechanisms differ from each other and whether one of these therapeutic options might be preferable for this purpose. METHODS:: Twenty-six neurologically healthy subjects were investigated using functional magnetic resonance imaging during AO alone and during AO with additional action imagery of video clips showing simple, object-related hand actions. RESULTS:: The blood oxygenation level dependent (BOLD) signal induced by AO increased in a bihemispheric, symmetrical network of areas including the occipital, superior, and inferior parietal cortex, dorsal and ventral premotor regions, and the prefrontal cortex. The addition of imagery to the AO elicited additional activation in both cerebellar hemispheres, caudate nucleus, ventral and dorsal premotor cortex, inferior parietal cortex, and the supplementary motor area. DISCUSSION AND CONCLUSION:: These data reveal more profound activations of the motor system during AO in conjunction with imagery than during AO alone. These results may have important implications for neurorehabilitation and motor learning. © 2012 Neurology Section, APTA. Source

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