Barley beta-glucan promotes MnSOD expression and enhances angiogenesis under oxidative microenvironment.
Level 5 - mechanism / opinion, no new human data
Preclinical bench and animal study (in vitro HUVEC culture and in vivo zebrafish embryos).
PubMed 25388628 · doi:10.1111/jcmm.12442
What was done
Researchers investigated the effects of barley-derived (1,3)-β-D-glucan on manganese superoxide dismutase (MnSOD) expression and angiogenesis under oxidative stress. They tested cellular mechanisms, superoxide load, endothelial nitric oxide synthase (eNOS) activity, and histone H4 acetylation in human umbilical vein endothelial cells (HUVECs) in vitro, and evaluated in vivo vasculogenesis in transgenic zebrafish embryos (Tg(kdrl:EGFP)s843Tg) exposed to an oxidative microenvironment.
What was found
Treatment of HUVECs with 3% w/v β-D-glucan increased MnSOD levels by 200% ± 2% compared to control and by 50% ± 4% compared to untreated H2O2-stressed cells. In vivo, 24-hour treatment with 3% w/v β-D-glucan rescued vasculogenesis in oxidative-stressed zebrafish embryos. MnSOD overexpression in HUVECs was accompanied by increased eNOS activity, decreased superoxide anion load, enhanced cell survival, and prevention of hypoxia-inducible factor 1-alpha (HIF-1α) upregulation. While β-D-glucan increased histone H4 acetylation, testing with the HDAC inhibitor sodium butyrate indicated that MnSOD activation occurred independently of histone acetylation levels.
Why it matters
The study identifies a potential mechanism whereby barley β-glucan supports antioxidant enzyme expression and promotes vascular formation under oxidative stress in model systems.
Limits
The evidence is entirely preclinical, restricted to in vitro endothelial cell culture and zebrafish models. No mammalian in vivo models or human clinical data were evaluated. The abstract does not specify exact sample sizes, replicate counts, or variability metrics for several qualitative endpoints.
Cited by
- partial Barley contains beta-glucan, a dietary fiber that stimulates blood vessel growth (angiogenesis) and nerve growth.