Biological activity versus physiological function of proinsulin C-peptide

Area of Science:

• Endocrinology and Metabolism
• Molecular Biology
• Evolutionary Biology

Background:

• Proinsulin C-peptide (C-peptide) research has significantly advanced the understanding of insulin and peptide hormone biology.
• Initial research focused on C-peptide processing and regulatory stages of prohormones.
• Subsequent phases explored the concept of single prohormones yielding multiple active peptides.

Discussion:

• Evolutionary patterns in hormone biology have been crucial in assessing C-peptide's physiological role.
• C-peptide research has demonstrated how evolutionary processes shape biological activities and functions.
• The understanding of peptide hormone evolution has been influenced by C-peptide studies.

Key Insights:

• C-peptide research revealed that peptide hormones undergo processing and their pro-forms have regulatory roles.
• It highlighted that a single prohormone can possess multiple activities, impacting therapeutic development.
• Plasma C-peptide levels are a standard measure for assessing beta-cell activity in diabetes patients.

Outlook:

• C-peptide fragments are utilized in immunotherapy for type I diabetes.
• Despite not being considered a hormone, C-peptide's bioactivities continue to inform the study of evolutionary changes in other peptides.
• Ongoing research into C-peptide's bioactivities may yield further insights into peptide hormone evolution and function.