Heat-killed Mycobacterium aurum reduces hyperglycemia in streptozotocin-induced diabetic mice
Both prophylactic oral and therapeutic intradermal administration of heat-killed M. aurum attenuated hyperglycemia in an STZ mouse model of diabetes, with no effect in non-diabetic animals.
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What the study showed
Oral prophylactic treatment reduced blood glucose by 39–60% at weeks 5–8 post-STZ, with a trend toward improved serum C-peptide but no significant changes in glucose transport or antioxidant proteins. Intradermal therapeutic dosing lowered blood glucose ~30–40% and modestly enhanced insulin secretion, normalizing hepatic UCP2, hepatic α-LDH, and skeletal muscle UCP3 protein levels.
How it was done
Male BALB/c mice received STZ (150 mg/kg) to induce diabetes; heat-killed M. aurum (1 mg) was given orally (3 prophylactic doses pre-STZ) or intradermally (6 weekly therapeutic doses post-STZ); glycemic parameters, C-peptide/insulin by ELISA, and tissue protein expression by Western blot were assessed.
Risk of bias
This is entirely an animal study; the abstract does not report per-group sample sizes or full variance data. The STZ model incompletely recapitulates human diabetes pathophysiology, and mechanistic pathways remain only partially described.
What this study does NOT prove
The study does not demonstrate efficacy, safety, or mechanism in humans, nor does it establish that M. aurum preserves beta-cell mass or reverses established diabetes.
In clinical practice
No clinical recommendations can be derived from this study. Preclinical murine findings require replication in controlled human trials before any therapeutic consideration.
Limitations
This is entirely an animal study; the abstract does not report per-group sample sizes or full variance data. The STZ model incompletely recapitulates human diabetes pathophysiology, and mechanistic pathways remain only partially described.
Technical appendix
Version history
- 1.0 · 2026-08-23 — Auto-generated under Evidence Standard v1.0
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