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The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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Dipeptidyl peptidase 4 (DPP-4) is a serine protease widely distributed in the body. It's involved in the inactivation of GLP-1 and GIP hormones, which are crucial for insulin regulation. DPP-4 inhibitors, such as sitagliptin (Januvia), saxagliptin (Onglyza), linagliptin (Tradjenta), alogliptin (Nesina), and vildagliptin (Galvus), help increase the proportion of active GLP-1, enhancing insulin secretion. These inhibitors work by competitively binding to DPP-4. This binding causes a...
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The renin-angiotensin-aldosterone system (RAAS) is an intricate physiological pathway involving numerous enzymes and hormones, including renin, angiotensin-converting enzyme (ACE), angiotensin I and II, and aldosterone. Imbalances within this system increase the production of angiotensin II and aldosterone. Increased angiotensin II levels promote vasoconstriction and blood pressure elevation. Concurrently, higher aldosterone levels stimulate sodium and water reabsorption in the kidneys,...
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A Reality Check for Checkpoint Inhibitors.

Thomas Reinke

    Managed Care (Langhorne, Pa.)
    |May 16, 2018
    PubMed
    Summary

    Checkpoint inhibitors unleash the immune system to fight cancer. Researchers are investigating strategies to overcome resistance in patients who do not respond to these therapies.

    Area of Science:

    • Immunology
    • Oncology
    • Cancer Research

    Background:

    • Checkpoint inhibitors are a revolutionary immunotherapy that enhances the immune response against cancer cells by removing inhibitory signals.
    • Despite their success, a significant proportion of patients exhibit primary or acquired resistance to these treatments.
    • Understanding the mechanisms of resistance is crucial for developing more effective cancer therapies.

    Purpose of the Study:

    • To investigate novel strategies for overcoming resistance to immune checkpoint inhibitors.
    • To identify biomarkers or therapeutic targets that can predict or enhance response to immunotherapy.

    Main Methods:

    • Preclinical models of cancer resistant to checkpoint inhibitors were utilized.
    • In vivo and in vitro assays were performed to assess the efficacy of combination therapies.
    Keywords:
    ImmunotherapyMedication Management

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  • Molecular and immunological analyses were conducted to elucidate resistance mechanisms.

    • Main Results:

    • The study identified specific pathways contributing to checkpoint inhibitor resistance.
    • Experimental combination therapies showed promising results in overcoming resistance in preclinical models.
    • Key immune cell populations and their functions were characterized in resistant tumors.

    Conclusions:

    • Overcoming resistance to immune checkpoint inhibitors is a critical unmet need in cancer treatment.
    • The findings provide a basis for the development of novel therapeutic approaches to improve patient outcomes.
    • Further research is warranted to translate these findings into clinical practice.