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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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The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...
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Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside...
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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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Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
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2'-Hydroxycinnamaldehyde induces apoptosis through HSF1-mediated BAG3 expression.

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2-hydroxycinnamaldehyde (HCA) triggers apoptosis in colon cancer cells by increasing BAG3 expression. This study reveals BAG3 as a key mediator in HCA-induced cancer cell death, suggesting its potential as an anticancer therapeutic target.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • BAG3 is a co-chaperone involved in cellular stress responses.
  • BAG3 plays a role in both normal and neoplastic cells.
  • 2'-Hydroxycinnamaldehyde (HCA) exhibits antitumor properties.

Purpose of the Study:

  • To investigate the role of HCA in inducing BAG3 expression.
  • To determine if BAG3 mediates HCA-induced apoptosis in cancer cells.
  • To explore HCA and BAG3 as potential anticancer therapeutic targets.

Main Methods:

  • Assessing apoptosis via caspase activation and Annexin V staining in SW480 and SW620 colon cancer cells.
  • Quantifying BAG3 mRNA and protein levels following HCA treatment.
  • Analyzing transcription factor HSF1 activation.
  • Utilizing siRNA to knockdown BAG3 expression.

Main Results:

  • HCA significantly induced BAG3 expression in a dose- and time-dependent manner.
  • HCA-induced apoptosis was confirmed by caspase activation, PARP cleavage, and Annexin V staining.
  • HSF1 activation was identified as the mechanism for HCA-induced BAG3 expression.
  • Knockdown of BAG3 expression attenuated HCA-induced apoptosis.

Conclusions:

  • HCA induces apoptosis in colon cancer cells through the upregulation of BAG3.
  • BAG3 is a critical mediator of HCA's cytotoxic effects on cancer cells.
  • BAG3 represents a promising therapeutic target for anticancer strategies.