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Leaky Scanning02:28

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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Effective sample preparation is crucial for accurate and reliable laboratory analysis. During this process, two significant sources of error can arise: concentration bias from improper sample splitting and contamination caused by methods used to reduce particle size, such as grinding or homogenization. Identifying and minimizing these potential errors is crucial to ensuring the validity of the analysis.
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In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
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Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
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In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
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Mutagenicity and carcinogenicity refer to the ability of drugs to cause genetic defects and induce cancer, respectively. The International Agency for Research on Cancer (IARC) classifies agents into four groups based on their carcinogenic potential. Group 1 agents are known human carcinogens; group 2A agents are probably carcinogenic to humans; group 3 agents lack data to support their role in carcinogenesis; and group 4 includes agents for which data support that they are not likely to be...
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Time-lapse Fluorescence Imaging of Arabidopsis Root Growth with Rapid Manipulation of The Root Environment Using The RootChip
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JCAR015 in ALL: A Root-Cause Investigation

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    Juno Therapeutics investigated five deaths halting JCAR015 development for acute lymphoblastic leukemia. Findings suggest rapid T-cell proliferation and cytokine surges may have caused fatal cerebral edema by disrupting the blood-brain barrier.

    Area of Science:

    • Immunotherapy
    • Oncology
    • Neuroscience

    Background:

    • JCAR015, a CAR T-cell therapy, faced development halt due to patient deaths.
    • Acute lymphoblastic leukemia (ALL) is a significant hematologic malignancy.

    Purpose of the Study:

    • To investigate the multifactorial causes of patient deaths during JCAR015 clinical trials.
    • To elucidate the biological mechanisms underlying fatal adverse events in ALL patients treated with CAR T-cell therapy.

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    • Internal probe and data analysis of clinical trial outcomes.
    • Correlation analysis between T-cell proliferation, cytokine levels, and neurological events.

    Main Results:

    • Multiple factors contributed to the observed fatalities.

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  • Rapid T-cell proliferation led to increased inflammatory cytokine levels.
  • Elevated cytokines potentially disrupted the blood-brain barrier, causing cerebral edema.

    • Conclusions:

    • The fatal adverse events were likely linked to cytokine release syndrome (CRS) and neurotoxicity.
    • Understanding these mechanisms is crucial for improving CAR T-cell therapy safety in ALL treatment.