Browsing by Subject "serum"
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Item Evaluation of Reconstituted High-Density Lipoprotein as a Drug Delivery System in Drug-Sensitive and Drug-Resistant Ovarian Cancer Cell Lines(2004-05-01) Buttreddy, Sabitha; Borejdo, Julian; McConathy, Walter J.; Nair, Maya P.The purpose of this study was to perform uptake and efflux studies of ORB in drug-sensitive (OV1063) and drug-resistant (SK-OV-3 and OVCAR-3) cells. Experiments were carried out by delivering ORB to the cells with and without rHDL to compare the amount of ORB taken up and expelled by the respective cells. Because serum contains lipoproteins, the experiments were also done in the absence of serum to show the specific effect of the rHDL vehicle. Because the efflux pumps responsible for multi-drug resistance are overexpressed and amplified in resistant cells, the efflux of ORB should be higher in these cells compared to the drug-sensitive cell line, OV1063. But, since our rHDL system is designed to reduce drug resistance by releasing the drug directly inside the cell bypassing the efflux pumps, the efflux of ORB should be less when it is delivered with rHDL.Item Peripheral Circulating Exosomal miRNAs Potentially Contribute to the Regulation of Molecular Signaling Networks in Aging(MDPI, 2020-03-11) Zhang, Hongxia; Jin, KunlinPeople are living longer than ever. Consequently, they have a greater chance for developing a functional impairment or aging-related disease, such as a neurodegenerative disease, later in life. Thus, it is important to identify and understand mechanisms underlying aging as well as the potential for rejuvenation. Therefore, we used next-generation sequencing to identify differentially expressed microRNAs (miRNAs) in serum exosomes isolated from young (three-month-old) and old (22-month-old) rats and then used bioinformatics to explore candidate genes and aging-related pathways. We identified 2844 mRNAs and 68 miRNAs that were differentially expressed with age. TargetScan revealed that 19 of these miRNAs are predicated to target the 766 mRNAs. Pathways analysis revealed signaling components targeted by these miRNAs: mTOR, AMPK, eNOS, IGF, PTEN, p53, integrins, and growth hormone. In addition, the most frequently predicted target genes regulated by these miRNAs were EIF4EBP1, insulin receptor, PDK1, PTEN, paxillin, and IGF-1 receptor. These signaling pathways and target genes may play critical roles in regulating aging and lifespan, thereby validating our analysis. Understanding the causes of aging and the underlying mechanisms may lead to interventions that could reverse certain aging processes and slow development of aging-related diseases.