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Medical Management of Acute Decompensated Heart Failure (ADHF)The primary goals of therapy for patients hospitalized with acute decompensated heart failure (ADHF) include:Relieving symptomsOptimizing volume statusSupporting oxygenation and ventilationMaintaining cardiac output (CO) and end-organ perfusionIdentifying and addressing the cause of ADHFPreventing complicationsProviding patient education on factors precipitating HF exacerbationPlanning for dischargeOngoing monitoring and assessment...
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Related Experiment Video

Updated: Jan 19, 2026

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Redesigned HIV antibodies exhibit enhanced neutralizing potency and breadth.

Jordan R Willis, Gopal Sapparapu, Sasha Murrell

    The Journal of Clinical Investigation
    |May 19, 2015
    PubMed
    Summary

    Researchers engineered a new variant of the PG9 antibody, PG9_N100(F)Y, which shows enhanced potency and broader neutralization against diverse HIV strains by stabilizing its unique structure.

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    Area of Science:

    • Immunology
    • Structural Biology
    • Computational Biology

    Background:

    • HIV envelope (Env)-targeting antibodies, like PG9, exhibit potent neutralizing activity.
    • PG9 possesses a long heavy chain complementarity determining region 3 (HCDR3) with unique structural interactions with HIV Env.

    Purpose of the Study:

    • To design and identify variants of the PG9 antibody HCDR3 loop with improved neutralization potency and breadth against diverse HIV strains.
    • To investigate the structural and thermodynamic basis for enhanced antibody activity.

    Main Methods:

    • Utilized the Rosetta software suite for in silico design of PG9 antibody HCDR3 loop variants.
    • Characterized the PG9_N100(F)Y variant through atomic resolution structural analysis and differential scanning calorimetry.
    • Assessed the neutralization activity of the variant against various HIV strains.

    Main Results:

    • A designed variant, PG9_N100(F)Y, demonstrated increased potency and neutralized PG9-resistant HIV strains, including those lacking the N160 glycan.
    • Structural analysis confirmed the mutated residue maintained the paratope surface.
    • Differential scanning calorimetry indicated a modest increase in the thermodynamic stability of the PG9_N100(F)Y fragment antigen binding (Fab).

    Conclusions:

    • Thermodynamic stabilization of the long HCDR3 in its active conformation enhances antibody potency.
    • Strategies for stabilizing HCDR3 regions could be crucial for in silico optimization of HIV antibodies.