Hydrogen-rich saline protects immunocytes from radiation-induced apoptosis

Med Sci Monit. 2012 Apr;18(4):BR144-8. doi: 10.12659/msm.882616.

Abstract

Background: Radiation often causes depletion of immunocytes in tissues and blood, which results in immunosuppression. Molecular hydrogen (H2) has been shown in recent studies to have potential as a safe and effective radioprotective agent through scavenging free radicals. This study was designed to test the hypothesis that H2 could protect immunocytes from ionizing radiation (IR).

Material/methods: H2 was dissolved in physiological saline or medium using an apparatus produced by our department. A 2-[6-(4'-hydroxy) phenoxy-3H-xanthen-3-on-9-yl] benzoate (HPF) probe was used to detect intracellular hydroxyl radicals (•OH). Cell apoptosis was evaluated by annexin V-FITC and Propidium iodide (PI) staining as well as the caspase 3 activity. Finally, we examined the hematological changes using an automatic Sysmex XE 2100 hematology analyzer.

Results: We demonstrated H2-rich medium pretreatment reduced •OH level in AHH-1 cells. We also showed H2 reduced radiation-induced apoptosis in thymocytes and splenocytes in living mice. Radiation-induced caspase 3 activation was also attenuated by H2 treatment. Finally, we found that H2 rescued the radiation-caused depletion of white blood cells (WBC) and platelets (PLT).

Conclusions: This study suggests that H2 protected the immune system and alleviated the hematological injury induced by IR.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis / drug effects*
  • Apoptosis / radiation effects
  • Caspase 3 / metabolism
  • Cells, Cultured
  • Cytoprotection / drug effects*
  • Cytoprotection / radiation effects
  • Enzyme Activation / drug effects
  • Enzyme Activation / radiation effects
  • Gamma Rays
  • Humans
  • Hydrogen / pharmacology*
  • Hydroxyl Radical / metabolism
  • Lymphocytes / drug effects
  • Lymphocytes / pathology*
  • Lymphocytes / radiation effects
  • Male
  • Mice
  • Mice, Inbred BALB C
  • Radiation-Protective Agents / pharmacology*
  • Sodium Chloride / pharmacology*
  • Spleen / drug effects
  • Spleen / enzymology
  • Spleen / radiation effects

Substances

  • Radiation-Protective Agents
  • Hydroxyl Radical
  • Sodium Chloride
  • Hydrogen
  • Caspase 3