Hydrogen-rich Saline is ineffective in oxygen-induced retinopathy.
OBJECTIVE
Hydrogen-rich saline (HRS) is a novel protection against various oxidative disorders and almost all types of inflammation. Moreover, its toxicity and side effects are rarely reported. We sought to clarify the protective effect of HRS against the oxygen-induced retinopathy (OIR) in C57BL/6 J model.


METHODS
The OIR in the HRS treated mice and the untreated controls were systematically compared. The retinas of both groups were analyzed using high-molecular-weight FITC-dextran staining of flat-mount preparations, hematoxylin and eosin (H&E) staining of cross-sections. The distribution and expression of the vascular endothelial growth factor (VEGF) were also evaluated by the immunohistochemical measurements between postnatal days 17 (P17) and P21.


RESULTS
The leakage and non-perfusion areas of retinal blood vessels were not alleviated in the HRS treatment group. Moreover, the number of preretinal vascular endothelial cell in the HRS treatment group was similar to that in the untreated group after exposure to hyperoxia (P>0.05). The degree of OIR was positively correlated with the expression level of VEGF. Intriguingly, the preretinal vascular endothelial cell count in the retinas of pups reared in room air with HRS treatment was 15.21±2.98. The preretinal vascular endothelial cell count of the HRS treated mice was significantly higher than that of the untreated group reared in room air.


CONCLUSIONS
In summary, HRS therapy (at the dose of 10ml/day, applied between P12 and P17) did not inhibit retinal neovascularization in OIR; On the contrary, it would induce the retinal neovascularization during the development of normal retinas.
Department Of Clinical Aerospace Medicine, School of Aerospace Medicine, The Fourth Military Medical University, 169# ChangLeWest Road, Xi'an 710032, China.
Qian
Q
Zhang
Department Of Clinical Aerospace Medicine, School of Aerospace Medicine, The Fourth Military Medical University, 169# ChangLeWest Road, Xi'an 710032, China.
Ye
Y
Tao
Department Of Clinical Aerospace Medicine, School of Aerospace Medicine, The Fourth Military Medical University, 169# ChangLeWest Road, Xi'an 710032, China. Electronic address: zhangzm@fmmu.edu.cn.
Zuo-Ming
ZM
Zhang
D000818:Animals; D006859:Hydrogen / Q000032:analysis*; D051379:Mice; D008810:Mice, Inbred C57BL; D010100:Oxygen / Q000009:adverse effects*; D012164:Retinal Diseases / Q000209:etiology / Q000517:prevention & control*; D012965:Sodium Chloride / Q000008:administration & dosage*
D012965:Sodium Chloride; D006859:Hydrogen; D010100:Oxygen
Hydrogen-rich saline; Oxygen-induced retinopathy; Retinal neovascularization