Preclinical evidence 5
5 studies reported at therapy level; 5 evidence entries itemised.
RatChemical/toxinWistarInfusionPre-treatment group received methylene blue infusion starting 5 min before the…
Model: Acute lung injury induced by an oleic acid bolus
Trends favouring improved permeability (wet to dry weight ratio and protein) were not statistically significant, but histological analysis showed reduced lesion areas in both the pre-treatment and post-treatment groups. The authors concluded the benefit was apparent only on macroscopic and histolog…
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MouseTBIControlled cortical impactInstitute for Cancer Research (ICR)malen = 210 mice in total, 70 per groupintraperitoneal1 mg/kg at 1 h after injury, 0.5 mg/kg at 6 h after injury,…first dose infused 1 h after injury
Model: Controlled cortical impact to the right frontoparietal cortex (3.0 m/s, 100 ms dwell, 2 mm depth, 2.5 mm tip) after 4 mm craniotomy
Methylene blue reduced injured hemisphere brain water content at 24 h, lowered modified neurological severity scores at 24 and 72 h, reduced lesion volume at all time points, preserved neurons and inhibited microglial activation at 72 h and 14 days, with increased markers of autophagy.
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RatTBIControlled cortical impactSprague-DawleyMaleDelayed treatment 24 h after injury, compared with acute treatment at 1 and 3 h…
Model: Controlled cortical impact to the primary forelimb somatosensory cortex in rats
Methylene blue given 24 h after injury still reduced lesion volume and functional deficits relative to vehicle.
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MouseTBIFluid percussionIntravenous infusion15-30 minutes after injury
Model: Midline fluid percussion injury (diffuse brain injury); complementary in vitro experiments with lipopolysaccharide-activated BV2 microglia
Immediate intravenous methylene blue reduced cerebral oedema, attenuated microglial activation and significantly reduced hippocampal inflammatory gene expression at 1 day post injury, and attenuated TBI-induced IL-1β and TNF-α expression in enriched microglia/macrophages. In vitro, methylene blue d…
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RatBurnChemical / corrosiveSprague-DawleyMalen = 21 rats, 7 per group across three groupsLocal application to the distal oesophageal lumen30 mg/kg90 min after the burn
Model: Corrosive alkali burn of the distal oesophagus with 30 per cent sodium hydroxide solution
Methylene blue raised tissue superoxide dismutase and total antioxidant status, lowered total oxidant status and significantly attenuated histopathological damage in the acute phase of corrosive oesophageal burn.
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