Zebrafish pancreatic β cell clusters undergo stepwise regeneration using Neurod1-expressing cells from different cell...

Area of Science:

• Endocrinology
• Developmental Biology
• Regenerative Medicine

Background:

• Pancreatic beta cells are crucial for insulin production and glucose homeostasis.
• Limited regenerative capacity of mammalian beta cells contributes to diabetes.
• Zebrafish beta cell clusters exhibit high regenerative potential, serving as a model for regeneration studies.

Purpose of the Study:

• To investigate the mechanisms of beta cell cluster regeneration in zebrafish.
• To determine the temporal dynamics of beta cell regeneration.
• To identify the cellular origins of regenerating beta cells.

Main Methods:

• Utilized larval and adult zebrafish models.
• Observed beta cell cluster regeneration processes.
• Analyzed gene expression, specifically Neurod1, in regenerating beta cells.

Main Results:

• Zebrafish beta cell clusters regenerate in a two-step process: functional recovery followed by numerical recovery.
• All regenerating pancreatic beta cells were derived from Neurod1-expressing cells.
• Diverse cell lineages contribute to both functional and numerical beta cell recovery across life stages.
• Neurod1 expression is a common feature during zebrafish beta cell development, neogenesis, and regeneration.

Conclusions:

• Zebrafish beta cell regeneration is a sequential process involving functional and numerical restoration.
• Neurod1-expressing cells are the primary source for regenerating beta cells in zebrafish.
• Understanding these mechanisms provides fundamental insights into beta cell development, neogenesis, and regeneration, relevant for diabetes research.