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Radioprotection of hematopoietic tissues in mice by lipoic acid.

Abstract
Lipoic acid is a lipophilic antioxidant that participates in many enzymatic reactions and is used clinically to treat mushroom poisoning and metal toxicity. In this report the protective effect of lipoic acid (oxidized form) against radiation injury to hematopoietic tissues in mice was assessed by the endogenous and exogenous spleen colony assays and survival (LD50/30) assay. Intraperitoneal administration of lipoic acid at a nonlethal concentration of 200 mg/kg body wt, 30 min before irradiation increased the LD50/30 from 8.67 to 10.93 Gy in male CD2F1 mice. Following a 9-Gy irradiation, the yield of endogenous spleen colony-forming units in mice treated with saline and lipoic acid was 0.75 +/- 0.5 and 8.9 +/- 1.6, respectively. Using the exogenous spleen colony assay, lipoic acid treatment increased the D0 from 0.81 +/- 0.01 to 1.09 +/- 0.01 Gy, yielding a dose modification factor of 1.34 +/- 0.01. Dihydrolipoic acid (reduced form) has no radioprotective effect in CD2F1 mice.
AuthorsN Ramakrishnan, W W Wolfe, G N Catravas
JournalRadiation research (Radiat Res) Vol. 130 Issue 3 Pg. 360-5 (Jun 1992) ISSN: 0033-7587 [Print] United States
PMID1594763 (Publication Type: Journal Article, Research Support, U.S. Gov't, Non-P.H.S.)
Chemical References
  • Radiation-Protective Agents
  • Thioctic Acid
Topics
  • Animals
  • Cell Survival (drug effects, radiation effects)
  • Colony-Forming Units Assay
  • Hematopoietic Stem Cells (drug effects, radiation effects)
  • Male
  • Mice
  • Radiation Injuries, Experimental (mortality, prevention & control)
  • Radiation-Protective Agents (therapeutic use)
  • Thioctic Acid (therapeutic use)

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