Key Developmental Regulators Suggest Multiple Origins of Pancreatic Beta Cell Regeneration
Hao Wang1, Xiangyong Wei1, Wenchao Shi1
1Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, Laboratory of Molecular Developmental Biology, School of Life Sciences, Southwest University, Beibei, Chongqing, China.
Abstract:
Extensive efforts have been done to try to restore the lost β cell mass for the cure of diabetes. Animal models have been established to provide evidences of cellular origins and contextual regulators of β cell regeneration. Here, we used a zebrafish β cell ablation and regeneration model to investigate β cell neogenesis in the first few days after a near-total β cell loss. Regeneration of β cells first occurred within 7 h post-treatment. Developmental regulators such as neurod, pdx1, mnx1, and nkx2.2a were active in the regenerating β cells, while at the same time suggesting different subpopulations of regenerative cellular origins. Using Cre/loxP-based lineage tracing, we showed that intrapancreatic ductal cells resisted to give rise to regenerating β cells. Given that transdifferentiation of α cell and δ cell can regenerate β cell, here we have provided further molecular evidence highly suggesting that the regenerating β cells originate from multiple cellular origins.
Insights
Researchers investigated beta cell regeneration in zebrafish after near-total loss. They found that beta cells regenerated rapidly from multiple cellular origins, excluding ductal cells, offering insights into diabetes cure strategies.
Area of Science:
- Endocrinology
- Developmental Biology
- Regenerative Medicine
Background:
- Diabetes mellitus is characterized by loss of pancreatic beta cells.
- Restoring beta cell mass is a key therapeutic goal for diabetes.
- Zebrafish models offer advantages for studying beta cell regeneration.
Purpose of the Study:
- To investigate the cellular origins and molecular regulators of beta cell neogenesis in zebrafish following near-total beta cell ablation.
- To understand the early stages of beta cell regeneration in the first few days after injury.
Main Methods:
- Utilized a zebrafish beta cell ablation and regeneration model.
- Employed Cre/loxP-based lineage tracing to identify cell origins.
- Analyzed the expression of key developmental regulators (neurod, pdx1, mnx1, nkx2.2a) in regenerating beta cells.
Main Results:
- Beta cell regeneration initiated within 7 hours post-ablation.
- Regenerating beta cells showed activity of developmental regulators, suggesting diverse cellular origins.
- Intrapancreatic ductal cells were found to resist differentiation into regenerating beta cells.
- Molecular evidence supported multiple cellular origins for regenerating beta cells, including potential alpha and delta cell transdifferentiation.
Conclusions:
- Beta cell neogenesis in zebrafish is a rapid process involving multiple cellular sources.
- Specific developmental regulators play crucial roles in beta cell regeneration.
- The study provides molecular insights into the complex origins of regenerating beta cells, relevant for diabetes research.
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