Tissue engineering is often referred to as a three-pronged discipline, with each prong corresponding to 1) a 3D material matrix (scaffold), 2) drugs that act on molecular signaling, and 3)regenerative living cells. Herein we focus on reviewing advances in controlled release of drugs from tissue engineering platforms. This review addresses advances in hydrogels and porous scaffolds that are synthesized from natural materials and synthetic polymers for the purposes of controlled release in tissue engineering. We pay special attention to efforts to reduce the burst release effect and to provide sustained and long-term release. Finally, novel approaches to controlled release are described, including devices that allow for pulsatile and sequential delivery. In addition to recent advances, limitations of current approaches and areas of further research are discussed.

At the outset of the 2009 H1N1 influenza ("swine flu") pandemic, Mexican nationals and Mexican commodities were shunned globally, and, in the United States, some media personalities characterized Mexican immigrants as disease vectors who were a danger to the country. We investigated instances in the U.S. of stigmatization of Latino migrant and seasonal farmworkers (MSFWs) and developed guidance for officials in curtailing its effects. At the same time, we explored social factors that make farmworkers more vulnerable to influenza infection and its complications, including high rates of underlying medical conditions, limited access to health care, and certain circumstances that interfere with the ability to implement community mitigation measures. This article reviews study findings and concludes with advice to policymakers and practitioners on the need to mitigate stigmatization in future outbreaks, to create public health preparedness systems that better protect migrant and seasonal farmworkers, and to undertake larger reforms to reduce institutional conditions that render farmworkers at greater risk for morbidity and mortality during health emergencies.

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The 2009 H1N1 pandemic stimulated a nationwide response that included a mass vaccination effort coordinated at the federal, state, and local levels. This article examines a sampling of state and local efforts during the pandemic in order to better prepare for future public health emergencies involving mass distribution, dispensing, and administration of medical countermeasures. In this analysis, the authors interviewed national, state, and local leaders to gain a better understanding of the accomplishments and challenges of H1N1 vaccination programs during the 2009-10 influenza season. State and local health departments distributed and administered H1N1 vaccine using a combination of public and private efforts. Challenges encountered during the vaccination campaign included the supply of and demand for vaccine, prioritization strategies, and local logistics. To improve the response capabilities to deal with infectious disease emergencies, the authors recommend investing in technologies that will assure a more timely availability of the needed quantities of vaccine, developing local public health capacity and relationships with healthcare providers, and enhancing federal support of state and local activities. The authors support in principle the CDC recommendation to vaccinate annually all Americans over 6 months of age against seasonal influenza to establish a standard of practice on which to expand the ability to vaccinate during a pandemic. However, expanding seasonal influenza vaccination efforts will be an expensive and long-term investment that will need to be weighed against anticipated benefits and other public health needs. Such investments in public health infrastructure could be important for building capacity and practice for distributing, dispensing, and administering countermeasures in response to a future pandemic or biological weapons attack.

After 9/11 and the 2001 anthrax letters, it was evident that our nation's healthcare system was largely underprepared to handle the unique needs and large volumes of people who would seek medical care following catastrophic health events. In response, in 2002 Congress established the Hospital Preparedness Program (HPP) in the U.S. Department of Health and Human Services (HHS) to strengthen the ability of U.S. hospitals to prepare for and respond to bioterrorism and naturally occurring epidemics and disasters. Since 2002, the program has resulted in substantial improvements in individual hospitals' disaster readiness. In 2007, the HHS Office of the Assistant Secretary for Preparedness and Response (ASPR) contracted with the Center for Biosecurity of the University of Pittsburgh Medical Center to conduct an assessment of U.S. hospital preparedness and to develop tools and recommendations for evaluating and improving future hospital preparedness efforts. One of the most important findings from this work is that healthcare coalitions-collaborative groups of local healthcare institutions and response agencies that work together to prepare for and respond to emergencies-have emerged throughout the U.S. since the HPP began. This article provides an overview of the HPP and the Center's hospital preparedness research for ASPR. Based on that work, the article also defines healthcare coalitions and identifies their structure and core functions, provides examples of more developed coalitions and common challenges faced by coalitions, and proposes that healthcare coalitions should become the foundation of a national strategy for healthcare preparedness and response for catastrophic health events.

Native tissues possess unparalleled physiochemical and biological functions, which can be attributed to their hybrid polymer composition and intrinsic bioactivity. However, there are also various concerns or limitations over the use of natural materials derived from animals or cadavers, including the potential immunogenicity, pathogen transmission, batch to batch consistence and mismatch in properties for various applications. Therefore, there is an increasing interest in developing degradable hybrid polymer biomaterials with controlled properties for highly efficient biomedical applications. There have been efforts to mimic the extracellular protein structure such as nanofibrous and composite scaffolds, to functionalize scaffold surface for improved cellular interaction, to incorporate controlled biomolecule release capacity to impart biological signaling, and to vary physical properties of scaffolds to regulate cellular behavior. In this review, we highlight the design and synthesis of degradable hybrid polymer biomaterials and focus on recent developments in osteoconductive, elastomeric, photoluminescent and electroactive hybrid polymers. The review further exemplifies their applications for bone tissue regeneration.

Lower back pain is mainly caused by intervertebral disc degeneration, in which calcification is frequently involved. Here novel nanofibrous spongy microspheres (NF-SMS) are used to carry rabbit bone marrow mesenchymal stromal cells (MSCs) to regenerate nucleus pulposus tissues. NF-SMS are shown to significantly enhance the MSC seeding, proliferation and differentiation over control microcarriers. Furthermore, a hyperbranched polymer (HP) with negligible cytotoxicity and high microRNA (miRNAs) binding affinity is synthesized. The HP can complex with anti-miR-199a and self-assemble into "double shell" polyplexes which are able to achieve high transfection efficiency into MSCs. A double-emulsion technique is used to encapsulate these polyplexes in biodegradable nanospheres (NS) to enable sustained anti-miR-199 delivery. Our results demonstrate that MSC/HP-anti-miR-199a/NS/NF-SMS constructs can promote the nucleus pulposus (NP) phenotype and resist calcification in vitro and in a subcutaneous environment. Furthermore, injection of MSC/HP-anti-miR-199a/NS/NF-SMS can stay in place, produce

Previous reports have identified the development of healthcare coalitions as the foundation for disaster response across the United States. This survey of acute care hospitals characterizes the current status of participation by US hospitals in healthcare coalitions for emergency preparedness planning and response. The survey results show the nearly universal nature of a coalition approach to disaster response. The results suggest a need for wide stakeholder involvement but also for flexibility in structure and organization. Based on the survey results, the authors make recommendations to guide the further development of healthcare coalitions and to improve local and national response to disasters.