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Role of ER in the Secretory Pathway01:17

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Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
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The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
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Endoplasmic Reticulum01:39

Endoplasmic Reticulum

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The Endoplasmic Reticulum (ER) in eukaryotic cells is a substantial network of interconnected membranes with diverse functions, from calcium storage to biomolecule synthesis. A primary component of the endomembrane system, the ER manufactures phospholipids critical for membrane function throughout the cell. Additionally, the two distinct regions of the ER specialize in the manufacture of specific lipids and proteins.
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The Unfolded Protein Response01:37

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The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
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A sizable fraction of proteins destined for ER are first synthesized in the cell cytosol and then transported across the ER membrane–a process called post-translational translocation. Similar to cotranslationally translocated proteins, these proteins also use the Sec translocon complex to enter the ER lumen.
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Endoplasmic Reticulum Stress in Cancer.

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Summary
This summary is machine-generated.

The unfolded protein response (UPR), triggered by endoplasmic reticulum (ER) stress, drives cancer progression by affecting cell growth, immune evasion, and metastasis. Targeting UPR pathways offers a promising new strategy for cancer therapy.

Keywords:
endoplasmic reticulum (ER)metastasisproliferationtumor microenvironment (TME)unfolded protein response (UPR)

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Area of Science:

  • Oncology
  • Cellular Biology
  • Molecular Medicine

Background:

  • Endoplasmic reticulum (ER) stress is a key feature of cancer development.
  • The unfolded protein response (UPR) is a cellular mechanism to cope with ER stress, but it is dysregulated in cancer.

Purpose of the Study:

  • To analyze how the UPR promotes tumor progression.
  • To explore the UPR's role in cancer cell proliferation, immune evasion, metastasis, and drug resistance.
  • To review therapeutic strategies targeting the UPR.

Main Methods:

  • Literature review of UPR mechanisms in cancer.
  • Analysis of UPR sensor pathways (IRE1α, PERK, ATF6).
  • Examination of UPR crosstalk with signaling pathways (mTOR, MAPK, NF-κB) and the tumor microenvironment.

Main Results:

  • UPR sensors regulate key cancer processes including proliferation, immune evasion, metastasis, and drug resistance.
  • UPR signaling interacts with major pathways to promote tumor growth and metastasis.
  • The UPR influences the tumor microenvironment, supporting angiogenesis and immune evasion.

Conclusions:

  • The UPR plays a critical role in multiple facets of tumor progression.
  • Targeting UPR pathways presents a novel therapeutic avenue for cancer treatment.
  • Further research is needed to fully understand and exploit UPR-cancer interactions for clinical benefit.