Goblet cells: multifaceted players in immunity at mucosal surfaces

Area of Science:

• Immunology
• Cell Biology
• Microbiology

Background:

• Goblet cells (GCs) are vital epithelial cells in mucosal linings, primarily known for mucus secretion and barrier maintenance.
• Beyond barrier function, GCs contribute to innate immunity by secreting antimicrobial proteins, chemokines, and cytokines.
• Recent findings highlight GCs' role in forming goblet cell-associated antigen passages (GAPs), facilitating antigen transport to underlying immune cells.

Purpose of the Study:

• To review the multifaceted roles of goblet cells in mucosal immunity.
• To explore the function of goblet cell-associated antigen passages (GAPs) in antigen presentation.
• To discuss the potential for GCs to act as gatekeepers of immune responses at diverse mucosal surfaces.

Main Methods:

• Literature review of existing studies on goblet cell function.
• Analysis of observations regarding goblet cell interactions with luminal substances and immune cells.
• Synthesis of evidence suggesting conserved functions of GCs across different mucosal tissues.

Main Results:

• Goblet cells contribute to mucosal immunity through barrier maintenance and secretion of immune-modulating factors.
• Goblet cell-associated antigen passages (GAPs) enable the delivery of luminal antigens to lamina propria antigen-presenting cells (APCs).
• Evidence suggests that GCs may form GAPs and influence adaptive immunity at multiple mucosal sites, not just the gut.

Conclusions:

• Goblet cells play a critical role in mucosal immunity, extending beyond simple barrier function.
• The formation of GAPs by goblet cells represents a significant mechanism for initiating adaptive immune responses.
• Goblet cells are emerging as key players in regulating immune surveillance and response at various mucosal surfaces.