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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Epithelial Biology

Background:

  • Epithelial cells form specialized domains like apical and basolateral surfaces and primary cilia, essential for cell function.
  • Maintaining domain identity relies on selective SNARE-mediated vesicle fusion for protein and lipid transport.
  • The specific SNAREs (vesicle-associated membrane proteins or VAMPs) involved in apical protein delivery in kidney cells remain largely unidentified.

Purpose of the Study:

  • To investigate the role of VAMP7 in apical protein trafficking in kidney cells.
  • To determine if VAMP7 influences the delivery of apical proteins that utilize distinct pathways.
  • To explore the potential involvement of VAMP7 in primary cilia formation and cystogenesis.

Main Methods:

  • Polarized Madin Darby canine kidney (MDCK) cells were used to study VAMP7 localization and function.
  • VAMP7 expression and localization were assessed, including colocalization with LAMP2-positive compartments.
  • siRNA-mediated knockdown of VAMP7 was performed to analyze its effects on protein trafficking, lysosome size, primary cilia, and cystogenesis in 3D culture.

Main Results:

  • VAMP7 knockdown modulated lysosome size, consistent with its known role in lysosomal delivery.
  • Surprisingly, VAMP7 depletion did not affect the apical delivery of various tested cargoes.
  • VAMP7 knockdown significantly decreased primary cilia length and frequency and disrupted cystogenesis in 3D matrix culture.

Conclusions:

  • VAMP7 plays a critical role in ciliogenesis and lumen formation in kidney epithelial cells.
  • The observed effects of VAMP7 depletion on ciliogenesis and cystogenesis are independent of its role in lysosomal trafficking.
  • This study is the first to implicate an R-SNARE (VAMP7) in the processes of ciliogenesis and cystogenesis.