ABSTRACT
Health security has gained significant attention at the national and global levels, "security" is not a simple term; instead, it is "essentially contested" - that is, it induces debates about what it means and how to use it. This study aimed to define three terms frequently used in health security discussions. These terms are national health security, Global Health Security, and public health. The research method was a scoping review performed in three stages. The first stage was electronic searching based on selection criteria among multiple sources at various time points during the year 2023. These sources included online literature searches, websites of non-governmental organizations (NGOs), and other governmental health agencies. The second stage involved determining the relevance of the selected papers to the study's objectives; the selected papers had moderate to high relevance to the study's objectives. The third stage was to evaluate the methodological quality of a study; we selected peer-reviewed published papers and websites recognized as trustworthy sources of information. The search yielded 143 articles; five met the inclusion criteria and were subjected to the definition of health security. Despite proposed definitions, agreement has yet to be reached on the content and scope of health security. Another main finding is that health security requires more state and international collaboration efforts to reach Global Health Security. To the best of our knowledge, no known government body or organization is responsible for governing health security in Saudi Arabia. However, the current study presents a definition of health security and differentiates it from the public health approach, in addition to emphasizing the importance of governing the related health sectors within each country in order to improve health security and have a positive impact on overall Global Health Security.
ABSTRACT
Gold nanoparticles have excellent potential for theranostic applications, but their impact on living cells is only partially understood. Many gold nanoparticles enter cells through endosomes/lysosomes which are linked to different cell organelles and compartments. Our study focuses on the unfolded protein response (UPR) in the endoplasmic reticulum (ER), cytoplasmic RNA-granules and proteostasis, because they are established indicators of cell stress and key regulators of cellular homeostasis. Using HeLa and renal proximal tubule cells as model systems, we show that gold nanourchins reduce cell proliferation, cause ER stress and impair proteostasis. Specifically, gold nanourchins activate the PERK-branch of the UPR, promote RNA oxidation, enhance P-body formation, and accumulate the oxidative stress marker Nrf2 and NFκB in nuclei. Taken together, our study demonstrates that gold nanourchins compromise ER, redox, protein, and RNA homeostasis. These insights provide new information on the cellular responses and molecular changes that gold nanourchins elicit in mammalian cells.
