We present a simple theory of the dynamics of force generation by RecA during homologous strand exchange and a continuous, deterministic mathematical model of the proposed process. Calculations show that force generation is possible in this model for certain reasonable values of the parameters. We predict the shape of the force-velocity curve for the Holliday junction, which exhibits a distinctive kink at large retarding force, and suggest experiments which should distinguish between the proposed model and other models in the literature.
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http://dx.doi.org/10.1074/jbc.275.21.16073 | DOI Listing |
Geroscience
January 2025
Buck Institute for Research On Aging, Novato, CA, 94945, USA.
Cells are subjected to dynamic mechanical environments which impart forces and induce cellular responses. In age-related conditions like pulmonary fibrosis, there is both an increase in tissue stiffness and an accumulation of senescent cells. While senescent cells produce a senescence-associated secretory phenotype (SASP), the impact of physical stimuli on both cellular senescence and the SASP is not well understood.
View Article and Find Full Text PDFFASEB J
January 2025
National Key Laboratory of Space Medicine, China Astronaut Research and Training Center, Beijing, China.
Microgravity-induced cardiac remodeling and dysfunction present significant challenges to long-term spaceflight, highlighting the urgent need to elucidate the underlying molecular mechanisms and develop precise countermeasures. Previous studies have outlined the important role of miRNAs in cardiovascular disease progression, with miR-199a-3p playing a crucial role in myocardial injury repair and the maintenance of cardiac function. However, the specific role and expression pattern of miR-199a-3p in microgravity-induced cardiac remodeling remain unclear.
View Article and Find Full Text PDFJ Coll Physicians Surg Pak
January 2025
Department of Oral and Maxillofacial Surgery, The Armed Forces Institute of Dentistry, Rawalpindi, Pakistan.
Objective: To compare the closed reduction approach with open reduction (transparotid approach) in the management of condylar fractures for parameters such as postoperative facial nerve injury, trismus, and malocclusion.
Study Design: An analytical comparative study. Place and Duration of the Study: Department of Oral and Maxillofacial Surgery, The Armed Forces Institute of Dentistry, Rawalpindi, Pakistan, from 10th January 2022 to 1st October 2023.
J Nanobiotechnology
January 2025
School of Medicine, Shanghai University, Shanghai, 200444, China.
Biochips are widely applied to manipulate the geometrical morphology of stem cells in recent years. Patterned antenna-like pseudopodia are also probed to explore the influence of pseudopodia formation on gene delivery and expression on biochips. However, how the antenna-like pseudopodia affect gene transfection is unsettled and the underlying trafficking mechanism of exogenous genes in engineered single cells is not announced.
View Article and Find Full Text PDFBreast Cancer Res
January 2025
Department of Cancer Biology, Loyola University Chicago Stritch School of Medicine, Maywood, IL, 50153, USA.
Resistance to endocrine therapies remains a major clinical hurdle in breast cancer. Mutations to estrogen receptor alpha (ERα) arise after continued therapeutic pressure. Next generation selective estrogen receptor modulators and degraders/downregulators (SERMs and SERDs) show clinical efficacy, but responses are often non-durable.
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