Publications by authors named "Amanda Miles"

[This corrects the article DOI: 10.1007/s40614-024-00408-2.].

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Social conditions like socioeconomic status (SES) are critical sources of health disparities. In pharmacoepidemiology research, our ability to measure SES in retrospective, real world clinical data remains challenged by a lack of patient-reported data. Some broadly accepted concepts can be measured at the individual level, such as income, poverty, and education.

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This is a review of the relation between operant response resurgence and behavioral contrast. Both are defined by rate changes in a target response as a function of environmental changes spatially or temporally distal to the location of the target response. The typical procedures for investigating these two phenomena differ in that (1) resurgence is studied using concurrent schedules and behavioral contrast predominantly with multiple schedules and (2) resurgence is assessed against an extinction baseline of the target response and behavioral contrast has been assessed under a variety of reinforcement schedules.

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Objective: This study aims to describe the healthcare resource utilization (HCRU) and direct medical cost of influenza-related hospitalizations to illustrate the persistent economic burden of influenza among adults in the US.

Methods: A retrospective cohort study was conducted using the PINC AI Healthcare Database. Adults hospitalized with a diagnosis of influenza between August 1-May 31 from 2016-2023 were identified and stratified by age (18-49, 50-64 and ≥65 years).

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Importance: No data comparing the estimated effectiveness of coadministering COVID-19 vaccines with seasonal influenza vaccine (SIV) in the community setting exist.

Objective: To examine the comparative effectiveness associated with coadministering the BNT162b2 BA.4/5 bivalent mRNA COVID-19 vaccine (BNT162b2-biv [Pfizer BioNTech]) and SIV vs giving each vaccine alone.

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Background: Older age and certain medical conditions are known to modify the risk of pneumococcal disease among adults. We quantified the risk of pneumococcal disease among adults with and without medical conditions in the United States between 2016 and 2019.

Methods: This retrospective cohort study used administrative health claims data from Optum's de-identified Clinformatics Data Mart Database.

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Article Synopsis
  • - Recent research indicates that miR-423-5p plays a significant role in regulating the growth and spread of prostate cancer cells, both in laboratory settings and in living organisms, by affecting protein expression.
  • - Proteomic analysis revealed 63 proteins that were differently expressed in prostate cancer cells with increased levels of miR-423-5p, leading to changes in metabolic processes like glycolysis and amino acid metabolism, as well as influences on immune response and transcriptional activity.
  • - The study also identified seven key proteins linked to miR-423-5p that affect patient survival rates, highlighting the potential of miR-423-5p to drive metabolic changes and impact various tumor-related processes in prostate cancer. *
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The p53 protein is mutated in more than 50% of human cancers. Mutated p53 proteins not only lose their normal function but often acquire novel oncogenic functions, a phenomenon termed mutant p53 gain-of-function. Mutant p53 has been shown to affect the transcription of a range of genes, as well as protein-protein interactions with transcription factors and other effectors; however, no one has intensively investigated and identified these proteins, or their MHC presented epitopes, from the viewpoint of their ability to act as targets for immunotherapeutic interventions.

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Therapeutic activation of thermogenic brown adipose tissue (BAT) may be feasible to prevent, or treat, cardiometabolic disease. However, rodents are commonly housed below thermoneutrality (~20 °C) which can modulate their metabolism and physiology including the hyperactivation of brown (BAT) and beige white adipose tissue. We housed animals at thermoneutrality from weaning to chronically supress BAT, mimic human physiology and explore the efficacy of chronic, mild cold exposure (20 °C) and β3-adrenoreceptor agonism (YM-178) under these conditions.

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Relative to two-dimensional (2D) culture, three-dimensional (3D) culture of primary neurons has yielded increasingly physiological responses from cells. Electrospun nanofiber scaffolds are frequently used as a 3D biomaterial support for primary neurons in neural tissue engineering, while hydrophobic surfaces typically induce aggregation of cells. Poly-l-lactic acid (PLLA) was electrospun as aligned PLLA nanofiber scaffolds to generate a structure with both qualities.

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Article Synopsis
  • - The long non-coding RNA MALAT1 is linked to worse outcomes in prostate cancer (PCa) and interacts with microRNAs, but its exact functions and regulation are not fully understood.
  • - Research showed that higher MALAT1 levels correspond with more aggressive cancer features, including high Gleason grade and metastasis, and that miR-423-5p can inhibit MALAT1's effects on cancer cell growth and movement.
  • - The study provides evidence that targeting the MALAT1/miR-423-5p relationship could be a potential therapeutic strategy in PCa by increasing survival rates and reducing metastatic behavior.
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Objective: To evaluate COVID-19 vaccine breakthrough infections among immunocompromised (IC) individuals.

Methods: Individuals vaccinated with BNT162b2 were selected from the US HealthVerity database (10 December 2020 July 2021). COVID-19 vaccine breakthrough infections were examined in fully vaccinated (≥14 days after 2nd dose) IC individuals (IC cohort), 12 mutually exclusive IC condition groups, and a non-IC cohort.

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Blindness associated with Usher syndrome type 1 (USH1) is typically characterized as rod photoreceptor degeneration, followed by secondary loss of cones. The mechanisms leading to blindness are unknown because most genetic mouse models only recapitulate auditory defects. We generated zebrafish mutants for one of the USH1 genes, protocadherin-15b (pcdh15b), a putative cell adhesion molecule.

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Type 2 diabetes is characterised by failure to control glucose homeostasis, with numerous diabetic complications attributable to the resulting exposure of cells and tissues to chronic elevated concentrations of glucose and fatty acids. This, in part, results from formation of advanced glycation and advanced lipidation end-products that are able to modify protein, lipid, or DNA structure, and disrupt normal cellular function. Herein we used mass spectrometry to identify proteins modified by two such adduction events in serum of individuals with obesity, type 2 diabetes, and gestational diabetes, along with similar analyses of human and mouse skeletal muscle cells and mouse pancreatic islets exposed to glucolipotoxic stress.

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Background: Homocitrullination is the post-translational modification of lysine that is recognized by T cells.

Methods: This study identified homocitrullinated peptides from aldolase, enolase, cytokeratin and binding immunoglobulin protein and used human leukocyte antigen (HLA) transgenic mice to assess immunogenicity by enzyme-linked immunosorbent spot assay. Vaccine efficacy was assessed in tumor therapy studies using HLA-matched B16 melanoma expressing constitutive or interferon γ (IFNγ)-inducible major histocompatibility complex class II (MHC-II) as represented by most human tumors.

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The vertebrate retina develops from a specified group of precursor cells that adopt distinct identities and generate lineages of either the neural retina, retinal pigmented epithelium, or ciliary body. In some species, including teleost fish and amphibians, proliferative cells with stem-cell-like properties capable of continuously supplying new retinal cells post-embryonically have been characterized and extensively studied. This region, termed the ciliary or circumferential marginal zone (CMZ), possibly represents a conserved retinal stem cell niche.

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Cell biologists generally consider that microtubules and actin play complementary roles in long- and short-distance transport in animal cells. On the contrary, using melanosomes of melanocytes as a model, we recently discovered that the motor protein myosin-Va works with dynamic actin tracks to drive long-range organelle dispersion in opposition to microtubules. This suggests that in animals, as in yeast and plants, myosin/actin can drive long-range transport.

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The mammalian mRNA nuclear export process is thought to terminate at the cytoplasmic face of the nuclear pore complex through ribonucleoprotein remodeling. We conduct a stringent affinity-purification mass-spectrometry-based screen of the physical interactions of human RNA-binding E3 ubiquitin ligases. The resulting protein-interaction network reveals interactions between the RNA-binding E3 ubiquitin ligase MKRN2 and GLE1, a DEAD-box helicase activator implicated in mRNA export termination.

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Article Synopsis
  • - The study investigates how exercise training affects brown (BAT) and white adipose tissue (WAT) in obese rats kept at thermoneutrality (28°C), focusing on the metabolic changes that occur in these tissues during inactivity.
  • - After 4 weeks of swim training, exercise was found to reduce weight gain in the rats without changing total fat mass or thermogenic gene expression but showed significant alterations in metabolic processes and protein levels related to skeletal muscle physiology in BAT.
  • - The results suggest that exercise induces an oxidative signature in BAT independent of traditional thermogenic pathways, indicating a new mechanism of BAT regulation through exercise training that may not rely on the activation of UCP1, a key protein in fat metabolism.
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Metastasis is associated with poor prognosis in breast cancer. Although some studies suggest beta-blockers increase survival by delaying metastasis, others have been discordant. This study provides both insights into the anomalous findings and identifies potential biomarkers that may be treatment targets.

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Article Synopsis
  • Metformin, a common diabetes medication, shows potential for treating advanced breast cancer, but resistance varies among cancer types due to complex signaling pathways.
  • Research investigated how metformin interacts with different breast cancer cell lines, particularly focusing on the HER2+ phenotype, and its effects on cell behavior and PYK2 activation.
  • Results indicated that HER2+ breast cancer cells are more resistant to metformin compared to other types, revealing a link between this resistance and the activation of the protein PYK2.
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Brown adipose tissue (BAT) function may depend on its anatomical location and developmental origin. Interscapular BAT (iBAT) regulates acute macronutrient metabolism, whilst perivascular BAT (PVAT) regulates vascular function. Although phenotypically similar, whether these depots respond differently to acute nutrient excess is unclear.

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Cancer biomarkers that can define disease status and provide a prognostic insight are essential for the effective management of patients with breast cancer (BC). The prevalence, clinicopathological and prognostic significance of PRPF38B expression in a consecutive series of 1650 patients with primary invasive breast carcinoma were examined using immunohistochemistry. Furthermore, the relationship(s) between clinical outcome and PRPF38B expression was explored in 627 patients with ER-negative (oestrogen receptor) disease, and 322 patients with HER2-overexpressing disease.

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Epithelial Mesenchymal Transition (EMT) is a key event in cancer progression. During this event, epithelial cancer cells undergo molecular and cellular changes leading to their trans-differentiation into mesenchymal cancer cells that are capable of migration, invasion, and metastasis to other tissues and organs. Here, we present a method for in vitro induction of EMT in prostate cancer cell lines using lentiviral expression of a PMLI isoform mutant construct.

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Involuntary episodic memories are memories of past events that come to mind with no preceding attempt of retrieval. Such memories have received little attention in relation to aging compared with voluntary episodic memories (i.e.

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