2013 · Xu et al. — Hydrogen-rich saline ameliorates renal injury induced by unilateral ureteral obstruction in rats.
Super-Abstract
In a rat model of obstructive kidney disease, hydrogen-rich saline (H₂ dissolved in salt solution) significantly reduced kidney tissue damage, cell death, fibrosis, and oxidative stress markers compared with untreated obstructed animals. The study suggests that H₂ saline could be a novel strategy to protect against obstruction-induced renal injury — but these findings come entirely from an animal experiment and cannot be directly transferred to humans.
Commentary
Unilateral ureteral obstruction (UUO) is a well-established rat model for progressive renal fibrosis and inflammation — mimicking, in accelerated form, conditions such as chronic obstructive nephropathy. The authors administered 5 ml/kg of H₂-rich saline intraperitoneally once daily for 10 days post-obstruction. The measured endpoints — kidney injury score, apoptosis index, macrophage infiltration, MDA (lipid-peroxidation marker) and SOD (antioxidant enzyme) activity — all moved in the protective direction for the H₂ group. While the biochemical plausibility (selective •OH scavenging, anti-inflammatory signalling) is consistent with the broader H₂ literature, the mechanistic depth here is limited: no pathway-level mechanistic work (e.g., Nrf2, NF-κB) is presented. The study is also methodologically modest (four groups, standard biochemistry), with no long-term follow-up or dose-ranging. The jump from a 10-day rat model to human renal disease requires multiple further steps.
Key quotes
- „Administration of HS significantly reduced the injury score.“ — primary histological outcome: H₂ saline protects kidney tissue
- „Interstitial fibrosis and macrophage infiltration were obvious in UUO kidneys. However, HS treatment significantly reduced the fibrosis and infiltration of macrophage in UUO kidneys.“ — anti-fibrotic and anti-inflammatory effects in the model
- „The data provide a biochemical and histologic basis for HS acting as a novel therapeutic strategy for preventing the renal injury induced by UUO.“ — authors' conclusion — with the caveat that this is a preclinical model only
Our assessment
This is a preclinical animal study — no human data. The results are internally consistent and methodologically standard for this field, but the study is small, short-term, and uses only one dose of H₂ saline. Honest limitation: rat UUO models have a poor track record of translating to human renal disease therapies. The findings are hypothesis-generating, not practice-changing. Whether these effects would hold in humans with chronic kidney disease or post-obstructive nephropathy remains entirely untested.
Study design
- Type: controlled animal study · Model: male Sprague-Dawley rats, unilateral ureteral obstruction (UUO), n = 4 groups · H₂ delivery: hydrogen-rich saline (HRSS), 5 ml/kg i.p. daily for 10 days
- Endpoints: renal injury score, apoptosis index, interstitial fibrosis, macrophage infiltration, MDA (oxidative stress), SOD (antioxidant) activity
- Result: all measured endpoints significantly improved in UUO+H₂ saline vs. UUO+saline; no mechanistic pathway analysis performed
Abstract
Hydrogen has been demonstrated to have effective protection against tissue injuries caused by oxidative stress, inflammation, and apoptosis. This study investigated the efficacy of hydrogen-rich saline (HS) on the prevention of renal injury induced by unilateral ureteric obstruction (UUO) in rats. Male Sprague-Dawley rats were divided randomly into 4 groups: sham group, UUO group, UUO+saline group, and UUO+HS group. UUO was induced by ligation of the left ureter. 5ml/kg HRSS or saline was administered beginning 1day after UUO and for 10days thereafter. Rats were killed at 10days after UUO. Left kidneys were excised immediately for the tissue histologic examinations and biochemical assays. Renal injury scores in the UUO group and the UUO+saline group were significantly higher compared with those in the sham group. However, administration of HS significantly reduced the injury score. Apoptosis index was significantly increased in UUO group and the UUO+saline group. HS treatment also reduced the apoptosis index. Interstitial fibrosis and macrophage infiltration were obvious in UUO kidneys. However, HS treatment significantly reduced the fibrosis and infiltration of macrophage in UUO kidneys. Significant increase in the MDA level and decrease in the SOD activity were observed in UUO group and the UUO+saline group. MDA level of UUO+HS group was significantly reduced. In addition, SOD activity of was significantly improved after treatment of HS. The data provide a biochemical and histologic basis for HS acting as a novel therapeutic strategy for preventing the renal injury induced by UUO.
Source & links
Screenshot of the PubMed page
This page mirrors the published abstract (© the authors / publisher) for reference and citation. The canonical source is the PubMed record linked above. This is not medical advice.