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The first total synthesis of extracellular factor, "Avenolide", in Streptomyces avermitilis has been achieved using a convergent approach. The stereogenic centers in two key segments were installed using Sharpless epoxidation and dihydroxylation. This synthetic study allowed the determination of the absolute configuration of avenolide as 4S,10R, and yielded important information on its structure-activity relationship.
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http://dx.doi.org/10.1038/ja.2011.90 | DOI Listing |
JAMA Netw Open
September 2025
School of Medicine and Public Health, University of Wisconsin-Madison, Madison.
Importance: It is unclear whether the duration of amyloid-β (Aβ) pathology is associated with neurodegeneration and whether this depends on the presence of tau.
Objective: To examine the association of longitudinal atrophy with Aβ positron emission tomography (PET)-positivity (Aβ+) and the estimated duration of Aβ+ (Aβ+ duration), controlling for tau-positivity.
Design, Setting, And Participants: Data for this longitudinal cohort study were drawn from the Wisconsin Registry for Alzheimer Prevention and the Wisconsin Alzheimer Disease Research Center Clinical Core Study.
Patient
September 2025
PPD Evidera Patient-Centered Research, Thermo Fisher Scientific, Waltham, MA, USA.
Background: Migraine care is often suboptimal owing to undertreatment, variation in clinical outcomes and administration methods among existing treatments, and between- and within-individual heterogeneity in the clinical course of migraine. In response to these challenges, preference studies have been increasingly conducted to inform treatment decision-making and development. However, gaps remain in understanding how treatment preferences have been assessed across different migraine studies.
View Article and Find Full Text PDFInflammopharmacology
September 2025
Department of Surgery, School of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil.
Objective: This study evaluated the effects and mechanisms of antioxidant and anti-inflammatory oils with a high omega-9:omega-6 ratio and a low omega-6:omega-3 ratio on post-extraction healing in rats.
Materials And Methods: A total of 128 Wistar rats were divided into four groups: Sham, Saline, Isolipidic, and Anti-inflammatory/Antioxidant. The animals received one of the following treatments: (1) 0.
Mol Biol Rep
September 2025
Department of Biochemistry, Pasteur Institute of Iran, Tehran, Iran.
Background: Colorectal cancer (CRC) remains one of the leading causes of cancer-related mortality worldwide. The tumor microenvironment (TME), particularly the interactions between endothelial cells and cancer-associated fibroblasts (CAFs), plays a pivotal role in promoting tumor growth, angiogenesis, oxidative stress, and therapy resistance. The HUVEC-fibroblast co-culture model closely mimics stromal-endothelial interactions observed in CRC, enabling mechanistic insights not achievable in monocultures.
View Article and Find Full Text PDFVet Res Commun
September 2025
Department of Animal Industry Convergence, Kangwon National University, Chuncheon, 24341, Republic of Korea.
Global warming causes heat stress in livestock, impairing their health, welfare, and productivity. In bovines, chronic stress elevates cortisol levels; however, this response often goes undetected due to the lack of practical biomatrices for accurate assessment. Common biomatrices such as blood require repeated sampling that may affect measurement accuracy.
View Article and Find Full Text PDF