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Lysosomal overloading and necrotizing enterocolitis.

Masaya Yamoto1,2, Mashriq Alganabi1, Sinobol Chusilp1,3

  • 1Division of General and Thoracic Surgery, Translational Medicine Program, The Hospital for Sick Children, University of Toronto, 1526-555 University Ave, Toronto, ON, M5G 1X8, Canada.

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PubMed
Summary
This summary is machine-generated.

Necrotizing enterocolitis (NEC) in premature infants involves excessive autophagy and endocytosis, leading to lysosomal overload and cell death. Reducing lysosomal burden may mitigate NEC severity.

Keywords:
AutophagyEndocytosisLysosomal membrane permeabilizationNecrotizing enterocolitis

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Area of Science:

  • Gastroenterology
  • Cell Biology
  • Neonatal Research

Background:

  • Intestinal absorption in premature infants relies on endocytosis and lysosomal degradation.
  • Autophagy contributes to lysosomal degradation but excessive autophagy can cause cell death.

Purpose of the Study:

  • To investigate the presence and role of autophagy and endocytosis in the small intestinal mucosa during experimental necrotizing enterocolitis (NEC).

Main Methods:

  • NEC was induced in mice via formula, LPS, and hypoxia.
  • Ileum tissues were analyzed for cellular morphology, autophagy/lysosomal activity, and cell death.
  • Breastfed mice served as controls.

Main Results:

  • NEC induced giant lysosomes, increased inflammation, and elevated autophagy.
  • Lysosomal activity was decreased, while apoptosis (programmed cell death) was increased in NEC models.
  • Lysosomal rupture was observed due to degradation overload.

Conclusions:

  • Experimental NEC leads to excessive autophagy and endocytosis, resulting in lysosomal overload, membrane rupture, and subsequent cell death.
  • These findings elucidate NEC pathogenesis, suggesting therapeutic targets in reducing lysosomal burden.