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The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
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Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
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Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size...
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Intracellular C4BPA Levels Regulate NF-κB-Dependent Apoptosis.

Monica M Olcina1,2, Ryan K Kim1, Nikolas G Balanis3

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Intracellular C4b-binding protein alpha chain (C4BPA) regulates cancer cell apoptosis by interacting with RelA. Patient-specific C4BPA mutations enhance apoptosis sensitivity, improving cancer survival outcomes.

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Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • Innate immunity's role in cancer is increasingly recognized, with intracellular functions for innate proteins suggested.
  • Understanding these intracellular roles and their modulation by patient-specific mutations is crucial.

Purpose of the Study:

  • To investigate the intracellular functions of C4b-binding protein alpha chain (C4BPA) in cancer.
  • To determine if C4BPA mutations affect its intracellular activity and cancer cell apoptosis.

Main Methods:

  • Analysis of intracellular C4BPA expression in cancer cells.
  • Investigation of C4BPA interaction with NF-κB family member RelA.
  • Assessment of apoptosis sensitivity in cell lines with patient-specific C4BPA mutations.

Main Results:

  • C4BPA is expressed intracellularly in cancer cells, interacting with RelA and regulating apoptosis.
  • Intracellular C4BPA expression is stress- and mutation-dependent.
  • C4BPA mutations correlate with improved cancer survival and increased sensitivity to oxaliplatin-induced apoptosis.
  • Sensitive C4BPA mutants show increased IκBα expression and stable IκBα-RelA complexes.

Conclusions:

  • C4BPA has a non-canonical intracellular role in regulating NF-κB-dependent apoptosis in cancer.
  • C4BPA mutations can influence cancer cell apoptosis and chemosensitivity.
  • These findings highlight C4BPA as a potential target for cancer therapy.