Human and mouse regenerative macrophages enhance beta cell survival, function, and proliferation
Mahdis Monajemi1,2, Alexandra S Craciun1,2, Qing Huang1,2
1Department of Surgery, University of British Columbia, Vancouver, BC, Canada.
Islets
|May 3, 2026
Summary
Regenerative macrophages, not pro-inflammatory ones, enhance pancreatic beta cell survival and function. This discovery offers a new therapeutic strategy for type 1 diabetes by leveraging macrophage regenerative properties.
Area of Science:
- Immunology
- Endocrinology
- Regenerative Medicine
Background:
- Type 1 diabetes involves immune-mediated beta cell destruction.
- Residual beta cells in long-standing type 1 diabetes suggest regenerative potential.
- Islet-resident macrophages play a role in diabetes, with potential regenerative functions.
Purpose of the Study:
- To investigate the influence of macrophage subtypes on pancreatic beta cell survival, function, and proliferation.
- To define the roles of macrophages in maintaining beta cell health.
Main Methods:
- Co-culture of mouse and human islets with macrophages in vitro.
- Assessment of beta cell apoptosis and insulin secretion.
- Evaluation of beta cell proliferation with harmine, a DYRK1A inhibitor.
- Analysis of macrophage phenotype and cytokine secretion post-islet co-culture.
Main Results:
- Regenerative macrophages, distinct from pro-inflammatory types, improved beta cell survival and function without direct contact.
- Macrophage-islet contact induced a regenerative phenotype in macrophages, marked by CD206 expression and anti-inflammatory cytokine release.
- Regenerative macrophages promoted beta cell proliferation when combined with harmine.
Conclusions:
- Regenerative macrophages are crucial for supporting pancreatic beta cell survival, function, and proliferation.
- Targeting the regenerative capacity of macrophages presents a novel therapeutic avenue for enhancing beta cell health.
