Anti-EGFR antibody conjugated organic-inorganic hybrid lipid nanovesicles selectively target tumor cells.

Chemical conjugation of anti-epidermal growth factor receptor monoclonal antibodies (anti-EGFR mAbs) to organic-inorganic hybrid liposomal immunocerasomes via maleimide-thiol coupling chemistry is explored as a mechanism for selectively targeting cancer cells. The cellular uptake and internalization of immunocerasomes are investigated in A431 cells that express an abnormally high level of EGFR, DU145 cells that overexpress EGFR, and HL-60 cells that are used as a negative control. The internalization study reveals a strong correlation between the receptor-mediated endocytosis of immunocerasomes and the membrane expression of EGFR. Further, free anti-EGFR mAbs and immunocerasomes conjugated with anti-EGFR mAbs at nanomolar doses display similar anti-proliferative effects on A431 cells. Additionally, serum proteins greatly reduce the cellular uptake of cerasomes that is mediated by non-specific receptors, but have no adverse effects on the specific EGFR-mediated delivery of immunocerasomes to A431 cells.

Medication adherence: is it a hidden drug-related problem in hidden elderly?

AIM: The present study aimed to identify the health needs of the hidden elderly in Hong Kong, and to investigate the impacts of pharmacist and nursing interventions on medication management and well-being in hidden elderly. METHODS: Participants were recruited by social workers if they were aged 65 years or older; did not have normal social life and network; did not have family support; and were not linked to the existing network of community support. Pharmacists identified drug-related problems. The health needs of participants were assessed by observations and interviews. Outcome measurements were scores of Morisky 8-item Medication Adherence Scale and EuroQoL (Quality of Life) 5-D Questionnaire. RESULTS: A total of 93 participants were recruited and 86 participants completed the study. The mean age was 81.46 ± 5.70 years, the mean number of chronic disease was 3.29 ± 1.45 and the mean number of chronic medications was 6.36 ± 2.96. The most commonly observed chronic diseases were hypertension, cardiac problems, diabetes, hyperlipidemia and arthritis. Drug non-adherence and storage problems were found in 61.63% and 69.77% of participants. The mean total EuroQoL score increased by 1.05 (P ≤ 0.001). The mean Morisky score decreased by 0.61, signifying improvement of medication adherence (P< 0.001). Female sex (P = 0.045), polypharmacy with more than nine concurrent medications (P = 0.013), arthritis (P = 0.006) and drug storage problems (P = 0.002) were identified as factors associated with poor medication adherence. CONCLUSIONS: The majority of hidden elderly suffered from multiple chronic diseases, and the prevalence of drug-related problems was high. Pharmacist and nursing interventions improved drug-related problems, drug compliance and quality of life in hidden elderly.

Plasma lithography surface patterning for creation of cell networks.

Systematic manipulation of a cell microenvironment with micro- and nanoscale resolution is often required for deciphering various cellular and molecular phenomena. To address this requirement, we have developed a plasma lithography technique to manipulate the cellular microenvironment by creating a patterned surface with feature sizes ranging from 100 nm to millimeters. The goal of this technique is to be able to study, in a controlled way, the behaviors of individual cells as well as groups of cells and their interactions. This plasma lithography method is based on selective modification of the surface chemistry on a substrate by means of shielding the contact of low-temperature plasma with a physical mold. This selective shielding leaves a chemical pattern which can guide cell attachment and movement. This pattern, or surface template, can then be used to create networks of cells whose structure can mimic that found in nature and produces a controllable environment for experimental investigations. The technique is well suited to studying biological phenomenon as it produces stable surface patterns on transparent polymeric substrates in a biocompatible manner. The surface patterns last for weeks to months and can thus guide interaction with cells for long time periods which facilitates the study of long-term cellular processes, such as differentiation and adaption. The modification to the surface is primarily chemical in nature and thus does not introduce topographical or physical interference for interpretation of results. It also does not involve any harsh or toxic substances to achieve patterning and is compatible for tissue culture. Furthermore, it can be applied to modify various types of polymeric substrates, which due to the ability to tune their properties are ideal for and are widely used in biological applications. The resolution achievable is also beneficial, as isolation of specific processes such as migration, adhesion, or binding allows for discrete, clear observations at the single to multicell level. This method has been employed to form diverse networks of different cell types for investigations involving migration, signaling, tissue formation, and the behavior and interactions of neurons arraigned in a network.