Basement Membrane Matrix Encapsulated Cell Aggregation for Investigating Murine Spleen Tissue Formation

Area of Science:

• Immunology
• Regenerative Medicine
• Tissue Engineering

Background:

• The spleen is a vital immune organ for blood-borne responses.
• Loss of spleen function increases susceptibility to severe infections and sepsis.
• Current spleen auto-transplantation methods aim to restore function, but regeneration mechanisms are unclear.

Purpose of the Study:

• To develop a method for aggregating and encapsulating spleen cells to investigate tissue formation requirements.
• To identify the specific cell types necessary for robust spleen tissue regeneration.

Main Methods:

• Spleen cells were aggregated and encapsulated within a basement membrane matrix.
• Constructs were cultured in vitro as 3D organoids and transplanted under the kidney capsule in vivo.
• Input cells were manipulated to assess their role in spleen tissue formation.

Main Results:

• Basement membrane matrix encapsulated cell constructs supported both in vitro and in vivo spleen tissue formation.
• Graft-derived PDGFRβ+MAdCAM-1- neonatal stromal cells were identified as essential for spleen tissue regeneration.
• These specific stromal cells are required for successful spleen tissue regeneration in transplantation models.

Conclusions:

• A novel method for spleen cell aggregation and encapsulation was developed, enabling investigation of regeneration requirements.
• Neonatal stromal cells expressing PDGFRβ and lacking MAdCAM-1 are critical for spleen tissue regeneration.
• This finding advances understanding of spleen regeneration and may inform strategies for treating spleen dysfunction.