A single 100 mg/kg dose of analytical-grade streptozotocin safely induced complete diabetes in cynomolgus monkeys without liver or kidney damage.
3/3 complete diabetesAll three monkeys achieved complete diabetes with no adverse organ effects from a single STZ dose
What the researchers found
Single 100 mg/kg dose of analytical-grade STZ induced complete diabetes in cynomolgus monkeys with destroyed beta cells and <0.5 ng/mL stimulated C-peptide, without organ toxicity.
Why it matters
Primate diabetes models are essential for testing islet transplants and peptide-based diabetes drugs. This accessible method removes the barrier of needing expensive clinical-grade STZ.
The numbers in context
100 mg/kg STZ IV; C-peptide <0.5 ng/mL; triphasic blood glucose response; no vomiting or organ toxicity
How the study worked
3 cynomolgus monkeys received IV STZ (100 mg/kg over 5 min). Blood glucose monitored hourly for 48h then twice daily. C-peptide by ELISA; liver/renal function blood chemistry; islet immunohistochemistry for insulin and glucagon.
Who was studied
3 cynomolgus monkeys
What this study cannot tell us
Only 3 animals — very small sample; no long-term follow-up reported; single STZ source tested; model represents type 1 (beta cell destruction), not type 2 diabetes.
How to read the evidence
Low — proof-of-concept with only 3 animals and no control group; adequate for method validation but limited for generalization.
When this study was published
Published in 2020; STZ diabetic models remain standard in primate diabetes research.
The bigger picture
Better primate diabetes models accelerate development of diabetes therapies including GLP-1 agonists, insulin analogs, and islet transplantation approaches.
Questions still open
- Is this method reproducible across different batches of analytical-grade STZ?
- How long does the diabetes model remain stable for long-term drug studies?
- Would lower doses achieve partial beta cell destruction for a type 2-like model?
Common questions
Why use monkeys for diabetes research?
What does streptozotocin do?
Read the original research
Induction of diabetes in cynomolgus monkey with one shot of analytical grade streptozotocin.
Animal models and experimental medicine, 3(1), 79-86
Citation
Liu, Zhengzhao; Lu, Ying; Hu, Wenbao; Hara, Hidetaka; Dai, Yifan; Cai, Zhiming; Mou, Lisha. (2020). Induction of diabetes in cynomolgus monkey with one shot of analytical grade streptozotocin.. Animal models and experimental medicine, 3(1), 79-86. https://doi.org/10.1002/ame2.12109