Publications by authors named "McCullough A"

Objective: To evaluate the impact of total duration of intraretinal fluid (IRF) exposure on visual acuity and vision-related quality of life in patients with neovascular age-related macular degeneration (nAMD).

Design: A post hoc analysis of integrated data from the VIEW 1 and VIEW 2 trials.

Participants: Patients with nAMD.

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Objectives: Engaging in dance of various styles confers health benefits among adults; however, additional studies on free-form dancing are needed to quantify its intensity and advance research on dance and health. This study characterized the absolute and relative physical activity (PA) intensities of solo, free-form dancing at self-determined moderate and vigorous intensities in adults.

Method: Participants (N = 48) ages 18 to 83 years old, with 0 to 56 years of dance training experience, engaged in 5-minute free-form dance bouts at respectively self-determined moderate and vigorous intensities, both with and without music.

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() is the causative agent of several human diseases, including the sexually transmitted infection chlamydia and eye infection trachoma. As an obligate intracellular bacterial pathogen, invasion is essential for establishing infection and subsequent pathogenesis. To facilitate invasion, secretes effector proteins through its type III secretion system (T3SS).

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  • * It emphasizes that any bone pain or noticeable mass should prompt further investigation, and patients with suspected primary bone tumours must be referred to specialized centres for care by accredited teams.
  • * The guidelines outline effective treatment options for various tumour types, including strategies for localized, metastatic, and recurrent disease, along with recommended follow-up schedules.
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Dietary exposure to aflatoxin B1 (AFB1) is a risk factor for the development of hepatocellular carcinomas. Following metabolic activation, AFB1 reacts with guanines to form covalent DNA adducts, which induce high-frequency G > T transversions. The molecular signature associated with these mutational events aligns with the single-base substitution signature 24 (SBS24) in the Catalog of Somatic Mutations in Cancer database.

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  • - The study investigated potential biomarkers for metabolic dysfunction-associated steatohepatitis (MASH) using proteomic analyses of plasma and liver tissue from 64 patients undergoing liver biopsy for MASLD diagnosis.
  • - Researchers found that 20 plasma proteins were significantly altered in MASH patients, with a notable AUROC of 0.671 for MASH detection; however, these proteins did not align with liver tissue protein changes.
  • - A subgroup of 10 plasma proteins showed promise, yielding a higher AUROC of 0.793 and suggesting that certain plasma proteins reflecting liver tissue changes could enhance MASH detection accuracy.
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Inflammation and oxidative stress are the key factors in the pathogenesis of both metabolic dysfunction-associated steatohepatitis (MASH) and atherosclerosis. Obeticholic acid (OCA), a farnesoid X receptor (FXR) agonist, improves hepatic inflammation and fibrosis in patients with MASH. However, it also reduces HDL cholesterol, suggesting that OCA may increase cardiovascular disease (CVD) risk in patients with MASH.

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Pixantrone and mitoxantrone are structurally related anticancer drugs which have been shown to generate covalent conjugates at apurinic/apyrimidinic (AP) sites in DNA. Mitoxantrone binding to AP sites induces DNA strand cleavage and inhibits the endonuclease activity of human AP endonuclease 1 (APE1). Here, pixantrone was demonstrated to have similar properties, but relative to mitoxantrone, it was significantly less potent in both DNA incision and APE1 inhibition.

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Background: Diabetes and obesity are associated with altered lipid metabolism and hepatic steatosis. Studies suggest that increases in lipid accumulation in these patients with metabolic dysfunction-associated steatotic liver disease (MASLD) are not uniform for all lipid components. This study evaluates this variation.

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The base excision repair (BER) pathway is a precise and versatile mechanism of DNA repair that is initiated by DNA glycosylases. Endonuclease VIII-like 1 (NEIL1) is a bifunctional glycosylase/abasic site (AP) lyase that excises a damaged base and subsequently cleaves the phosphodiester backbone. NEIL1 is able to recognize and hydrolyze a broad range of oxidatively-induced base lesions and substituted ring-fragmented guanines, including aflatoxin-induced 8,9-dihydro-8-(2,6-diamino-4-oxo-3,4-dihydropyrimid-5-yl-formamido)-9-hydroxyaflatoxin B (AFB-FapyGua).

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Increased risk for the development of hepatocellular carcinoma (HCC) is driven by a number of etiological factors including hepatitis viral infection and dietary exposures to foods contaminated with aflatoxin-producing molds. Intracellular metabolic activation of aflatoxin B (AFB) to a reactive epoxide generates highly mutagenic AFB-Fapy-dG adducts. Previously, we demonstrated that repair of AFB-Fapy-dG adducts can be initiated by the DNA glycosylase NEIL1 and that male mice were significantly more susceptible to AFB-induced HCC relative to wild-type mice.

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  • Researchers studied how tau, a protein linked to Alzheimer’s disease (AD), spreads in the brain and affects different stages of the disease.
  • They looked at data from 445 people aged 50 and older to see how tau spread and tau burden (the amount of tau present) relate to amyloid, another substance related to AD.
  • They found that as Alzheimer’s progresses, both tau spread and burden increase, but tau spread may reveal changes earlier, which can help in designing better clinical trials for treatment.
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Introduction: Amyloidosis, including cerebral amyloid angiopathy, and markers of small vessel disease (SVD) vary across dominantly inherited Alzheimer's disease (DIAD) presenilin-1 (PSEN1) mutation carriers. We investigated how mutation position relative to codon 200 (pre-/postcodon 200) influences these pathologic features and dementia at different stages.

Methods: Individuals from families with known PSEN1 mutations (n = 393) underwent neuroimaging and clinical assessments.

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Background And Objectives: Alzheimer disease (AD) is primarily associated with accumulations of amyloid plaques and tau tangles in gray matter, however, it is now acknowledged that neuroinflammation, particularly in white matter (WM), significantly contributes to the development and progression of AD. This study aims to investigate WM neuroinflammation in the continuum of AD and its association with AD pathologies and cognition using diffusion-based neuroinflammation imaging (NII).

Methods: This is a cross-sectional, single-center, retrospective evaluation conducted on an observational study of 310 older research participants who were enrolled in the Knight Alzheimer's Disease Research Center cohort.

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Mpox, caused by infection with , usually presents as a mild, self-limited illness in immunocompetent persons that resolves within 2-4 weeks. Serious complications have been reported when mpox lesions involve vulnerable anatomic sites, such as the eye, and in those with substantial immunosuppression. We describe a patient with advanced human immunodeficiency virus infection and sustained viral shedding of mpox with ocular involvement, which resulted in vision loss.

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Mitoxantrone (1,4-dihydroxy-5,8-bis[2-(2-hydroxyethylamino)ethylamino]-anthracene-9,10-dione) is a clinically-relevant synthetic anthracenedione that functions as a topoisomerase II poison by trapping DNA double-strand break intermediates. Mitoxantrone binds to DNA via both stacking interactions with DNA bases and hydrogen bonding with the sugar-phosphate backbone. It has been shown that mitoxantrone inhibits apurinic/apyrimidinic (AP) endonuclease 1 (APE1)-catalyzed incision of DNA containing a tetrahydrofuran (THF) moiety and more recently, that mitoxantrone forms Schiff base conjugates at AP sites in DNA.

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Background: Severe alcoholic hepatitis (AH) has a high short-term mortality rate. The MELD assesses disease severity and mortality; however, it is not specific for AH. We screened plasma samples from patients with severe AH for biomarkers of multiple pathological processes and identified predictors of short-term mortality.

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Objective: The objective of this review is to determine the prevalence and incidence of Mycoplasma genitalium infection.

Introduction: Mycoplasma genitalium is a sexually transmitted pathogen that can cause reproductive health issues in men and women. Recent US Food and Drug Administration (FDA)-approved testing has improved the capability to more readily diagnose and treat this infection.

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Supernumerary nipples develop on the chest and abdominopelvic regions along the embryonic milk line. Their anatomy varies from isolated accessory nipples to complete supernumerary nipples (accessory nipple, areola, and underlying glandular breast tissue). Patients with a pathogenic BReast CAncer (BRCA) sequence variation are at an increased cumulative risk of developing breast cancer, and it is the standard of care for them to be offered medical or surgical risk reduction.

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Nei-like glycosylase 1 (NEIL1) is a DNA repair enzyme that initiates the base excision repair (BER) pathway to cleanse the human genome of damage. The substrate specificity of NEIL1 includes several common base modifications formed under oxidative stress conditions, as well as the imidazole ring open adducts that are induced by alkylating agents following initial modification at N7 guanine. An example of the latter is the persistent and mutagenic 8,9-dihydro-8-(2,6-diamino-4-oxo-3,4-dihydropyrimid-5-yl-formamido)-9-hydroxyaflatoxin B (AFB-FapyGua) adduct, resulting from the alkylating agent aflatoxin B (AFB) exo-8-9-epoxide.

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  • The Dominantly Inherited Alzheimer Network (DIAN) focuses on studying autosomal dominant Alzheimer disease (ADAD), caused by mutations in three specific genes that have a 50% inheritance risk for offspring.
  • The predictable age of onset within ADAD families helps researchers track disease progression and test potential Alzheimer biomarkers during the disease's early stages.
  • Although ADAD is a small subset of overall Alzheimer cases, insights gained from this research could also benefit understanding of sporadic Alzheimer and contribute valuable data for studying healthy aging through non-carrier family members.
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Background: The prevalence of non-alcoholic fatty liver disease (NAFLD) is increasing in the USA. Some of these patients develop non-alcoholic steatohepatitis (NASH), which can progress to cirrhosis. Ultrasound imaging is one of the most used modalities for diagnosing hepatic steatosis.

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