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The Cell-based L-Glutathione Protection Assays to Study Endocytosis and Recycling of Plasma Membrane Proteins
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CREG1 promotes lysosomal biogenesis and function.

Jie Liu1, Yanmei Qi1, Joshua Chao1

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|May 10, 2021
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Summary

Cellular repressor of E1A stimulated genes (CREG1) is an endosomal-lysosomal protein. It plays a key role in endocytic trafficking, lysosomal biogenesis, and autophagy, impacting cellular degradation processes.

Keywords:
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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Protein Localization

Background:

  • Cellular repressor of E1A stimulated genes (CREG1) has been ambiguously classified due to a lack of validated antibodies for precise localization.
  • Previous hypotheses suggested CREG1 functions as a transcription repressor, secretory ligand, or mitochondrial/lysosomal protein, lacking definitive evidence.

Purpose of the Study:

  • To definitively determine the subcellular localization of CREG1 using validated antibodies.
  • To elucidate the functional role of CREG1 in cellular processes, particularly endocytosis and lysosomal function.

Main Methods:

  • Immunofluorescence microscopy utilizing validated antibodies for CREG1.
  • Gain- and loss-of-function analyses (overexpression, knockdown, knockout) to assess CREG1's cellular impact.
  • Assessment of macropinocytosis, clathrin-dependent endocytosis, endosomal-lysosomal acidification, lysosomal biogenesis, and autophagy.

Main Results:

  • CREG1 is primarily localized to the endosomal-lysosomal compartment.
  • CREG1 significantly influences macropinocytosis and clathrin-dependent endocytosis.
  • CREG1 promotes endosomal-lysosomal acidification, enhances lysosomal biogenesis, and boosts autophagy and lysosome-mediated degradation.

Conclusions:

  • CREG1 is confirmed as an endosomal-lysosomal protein.
  • CREG1 plays a crucial role in regulating endocytic trafficking and lysosomal biogenesis.
  • CREG1's functions are vital for efficient cellular degradation pathways, including autophagy.