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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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Rip2 Is Required for Nod2-Mediated Lysozyme Sorting in Paneth Cells.

Haifang Wang1,2, Xinwen Zhang1,2, Zhanguang Zuo1,2

  • 1Key Laboratory of Infection and Immunity, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.

Journal of Immunology (Baltimore, Md. : 1950)
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Rip2 is crucial for sorting antimicrobial peptides in Paneth cells, a process dependent on Nod2, LRRK2, and Rab2a. This pathway ensures lysozyme reaches the intestine, maintaining gut homeostasis.

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Area of Science:

  • Intestinal biology
  • Cellular biology
  • Immunology

Background:

  • Paneth cells are vital for intestinal homeostasis.
  • They secrete antimicrobial peptides into the lumen.
  • Lysozyme is a key antimicrobial peptide secreted by Paneth cells.

Purpose of the Study:

  • To investigate the role of Rip2 in lysozyme sorting within Paneth cells.
  • To identify host factors involved in this sorting process.
  • To understand the molecular pathway regulating lysozyme secretion.

Main Methods:

  • Utilized mouse models with Rip2 deficiency.
  • Examined lysozyme localization and degradation.
  • Investigated the recruitment of Rab2a to dense core vesicles (DCVs).
  • Assessed the localization of Nod2, LRRK2, and Rip2 to DCVs.

Main Results:

  • Rip2 deficiency caused lysosomal degradation of lysozyme in Paneth cells.
  • Rip2 deficiency prevented Rab2a recruitment to DCVs.
  • Rip2, Nod2, and LRRK2 were found to localize to DCVs.
  • Rip2's DCV localization was dependent on Nod2 and LRRK2.

Conclusions:

  • A genetic pathway (Nod2-LRRK2-Rip2-Rab2a) is essential for lysozyme sorting in Paneth cells.
  • This pathway is critical for proper lysozyme secretion and intestinal homeostasis.
  • The study highlights the complex orchestration of Paneth cell function by host factors.