Production of Secondary Metabolites from Cell Cultures of Sageretia thea (Osbeck) M.C. Johnst. Using Balloon-Type Bubble Bioreactors.

Sageretia thea is used in the preparation of herbal medicine in China and Korea; this plant is rich in various bioactive compounds, including phenolics and flavonoids. The objective of the current study was to enhance the production of phenolic compounds in plant cell suspension cultures of Sageretia thea. Optimum callus was induced from cotyledon explants on MS medium containing 2,4-dichlorophenoxyacetic acid (2,4-D; 0.5 mg L-1), naphthalene acetic acid (NAA, 0.5 mg L-1), kinetin (KN; 0.1 mg L-1) and sucrose (30 g L-1). Browning of callus was successfully avoided by using 200 mg L-1 ascorbic acid in the callus cultures. The elicitor effect of methyl jasmonate (MeJA), salicylic acid (SA), and sodium nitroprusside (SNP) was studied in cell suspension cultures, and the addition of 200 µM MeJA was found suitable for elicitation of phenolic accumulation in the cultured cells. Phenolic and flavonoid content and antioxidant activity were determined using 2,2 Diphenyl 1 picrylhydrazyl (DPPH), 2,2'-azino-bis (3-ethybenzothiazoline-6-sulphonic acid (ABTS), ferric reducing antioxidant power (FRAP) assays and results showed that cell cultures possessed highest phenolic and flavonoid content as well as highest DPPH, ABTS, and FRAP activities. Cell suspension cultures were established using 5 L capacity balloon-type bubble bioreactors using 2 L of MS medium 30 g L-1 sucrose and 0.5 mg L-1 2,4-D, 0.5 mg L-1 NAA, and 0.1 mg L-1 KN. The optimum yield of 230.81 g of fresh biomass and 16.48 g of dry biomass was evident after four weeks of cultures. High-pressure liquid chromatography (HPLC) analysis showed the cell biomass produced in bioreactors possessed higher concentrations of catechin hydrate, chlorogenic acid, naringenin, and other phenolic compounds.

Age-Friendly Community Interventions for Health and Social Outcomes: A Scoping Review.

To address the numerous challenges associated with aging, increased attention has been given to the development of age-friendly cities and communities (AFCC) to promote healthy aging and social participation. However, limited evidence exists for addressing both health and social needs through the AFCC framework. We address this gap by conducting a scoping review of the interventions that target both health and social outcomes within the purview of the AFCC framework. The results showed that many of the successful interventions used a partnership model and behavioral change theories to inform the program design and implementation. The results also indicated that social participation and engagement played a key role in making the interventions successful. However, the results revealed that the literature is dominated by person-focused approaches. Future research should focus more on evaluating environmental-focused interventions and develop a holistic framework that combines both person- and environment-based approaches to healthy aging.

The HIV Care Continuum in Small Cities of Southern New England: Perspectives of People Living with HIV/AIDS, Public Health Experts, and HIV Service Providers.

The HIV care continuum (HCC), comprised of five steps (screening, linkage to care, treatment initiation, retention, and viral suppression), is used to monitor treatment delivery to people living with HIV (PLWH). The HCC has primarily focused on large urban or metropolitan areas where the situation may differ from that in smaller cities. Three themes (i.e., knowledge, stigma, stability) that shaped HCC outcomes were identified from analysis of two qualitative studies involving HIV service providers, public health experts, and PLWH in smaller cities of southern New England. The findings suggest that enhancing HCC outcomes require a multiprong approach that targets both the individual and organizational levels and includes interventions to increase health literacy, staff communication skills, universal screening to assess patients' religiosity/spirituality and supplemental service needs. Interventions that further ensure patient confidentiality and the co-location and coordination of HIV and other healthcare services are particularly important in smaller cities.

RESUMEN: El cuidado continuo de VIH (HCC), constado de cinco etapas (pruebas, vinculación al cuidado, inico del tratamiento, retención, y supresión viral), se emplea para monitorizar la entrega de tratamientos a las personas que vivien con VIH (PLWH). El HCC ha enfocado principalmente en áreas grandes y urbanas o áreas metropolitanas, donde la situación podría ser diferente que la de las ciudades más pequeñas. Tres temas (i.e., conocimiento, estigma, estabilidad) que formaron los resultados de HCC fueron identificados con análisis de dos estudios cualitativos que involucraron los proveedores de servicios de VIH, expertos de la salud pública, y PLWH en ciudades más pequeñas en las partes sureñas de Nueva Inglaterra. Los hallazgos sugieren que la mejora de los resultados de HCC requiere un enfoque multidimensional que se dirigen a ambos niveles del individuo y organización, y que incluyen intervenciones para aumentar la alfabetización sanitaria, la habilidad de comunicación del personal, la prueba universal para evaluar la religiosidad/espiritualidad de los pacientes y la necesidad de servicios suplementarios. Intervenciones que aseguran aún más la confidencialidad de los pacientes y el co-ubicación y coordinación de los servicios de VIH y otras asistencias medicas son particularmente importantes en ciudades pequeñas.

Tumor-targeting nanogel that can function independently for both photodynamic and photothermal therapy and its synergy from the procedure of PDT followed by PTT.

A dual-function nano-system for synergistic photodynamic therapy (PDT) and photothermal therapy (PTT) was constructed. Gold nanorods (GNRs) as a PTT agent and chlorin e6 (Ce6) as a photosensitizer (PS) for PDT were loaded into a chitosan-functionalized, Pluronic-based nanogel that was proven to be an efficient delivery vehicle to the tumor site in vivo. Previously reported combined therapy systems relied on quenching and de-quenching of PS for PDT upon thermo-impact of PTT, thus only PTT followed by PDT procedure was possible. In contrast, the present dual-acting system has no quenching between PS and GNRs by preventing direct contact and self-aggregation of photo-sensitizers, allowing independent PDT or PTT procedure. In both in vitro cell culture and in vivo tumor-bearing mice experiments, a remarkably enhanced tumor ablation compared to the treatment of PDT or PTT only was observed by the treatment of PDT followed by PTT, but not significantly by the treatment of PTT followed by PDT. Thus, the present study demonstrated the synergistic effect of PDT and PTT in a sequence-dependent manner, and our system is a promising dual function nano system to achieve the enhanced phototherapy in vivo.

Tumor regression in vivo by photothermal therapy based on gold-nanorod-loaded, functional nanocarriers.

We developed a very effective hyperthermia system for successful photothermal cancer therapy. Instead of applying individual gold nanorods (GNRs) that can absorb NIR light, GNRs were loaded into functional nanocarriers that could provide stable storage of GNRs and selective delivery to a target tumor site. The functional nanocarriers (chitosan-conjugated, Pluronic-based nanocarriers) were prepared by chemically cross-linking Pluronic F 68 with chitosan conjugation to form a flexible, soft, and excellent reservoir for biomacromolecules as well as tumor targeting. In vivo characteristics of the nanocarriers including a long circulation time, a good tumor accumulation, and low liver uptake were previously characterized by us. When GNRs were delivered by using these nanocarriers, much enhanced in vitro cellular uptake and a photothermal effect were observed for a cancer cell line. More importantly, an intravenous injection of this system followed by NIR laser irradiation to the tumor site resulted in a very efficient thermolysis in vivo. Thus, apparently complete tumor resorption was achieved without damage to the surrounding tissue, suggesting a promising candidate for clinical phototherapeutic applications.