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Potential use of simple manganese salts as antioxidant drugs in horses.

Abstract: The scavenging of superoxide radicals by endogenous and therapeutically administered superoxide dismutases may prevent superoxide-mediated oxidative stress leading to lipid peroxidation, membrane lysis, and cell death in a wide variety of normal and pathologic states. Simple inorganic manganous salts such as MnCl2 also have superoxide dismutase-like activity and are extremely inexpensive, compared with enzymatic superoxide dismutase preparations. In this study, we explored the use of Mn salts as antioxidant drugs. We used the percentage of inhibition of nitroblue tetrazolium reduction by superoxide as a measure of the amount of superoxide dismutase-like activity. We found concentration-related increases in superoxide scavenging activity in simple buffer solutions upon addition of 1.25, 2.5, and 5.0 microM MnSO4. To determine whether Mn salts can inhibit oxidative damage in tissues, we used an in vitro model of lipid peroxidation in ischemic and reoxygenated rat liver slices. Concentrations of 10, 100, and 1000 mumoles MnCl2/L of buffer significantly decreased indicators of lipid peroxidation believed to be initiated by intracellular superoxide. We then determined the effectiveness of MnCl2 as a superoxide scavenger in conscious horses by measuring the superoxide scavenging ability of equine plasma before and during intravenous infusions of 1.0 L volumes of 0.9% saline solution containing 0, 12.5, or 25 mM MnCl2. Plasma Mn concentrations, which were determined by atomic absorption spectrophotometry, increased as a function of time and dose. Intravenously administered MnCl2 concomitantly produced dose-related increases in superoxide scavenging ability of equine plasma at 15, 30, 45, and 60 minutes after the onset of infusion, compared with preinfusion control values.(ABSTRACT TRUNCATED AT 250 WORDS)
Publication Date: 1992-10-01 PubMed ID: 1456528
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  • Journal Article
  • Research Support
  • U.S. Gov't
  • P.H.S.

Summary

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This research studied the use of affordable manganese salts as antioxidant drugs in horses. The study found that these salts, specifically MnCl2, showed activity in removing harmful superoxide radicals, similar to the function of superoxide dismutases, hence potentially preventing oxidative stress and concerned diseases.

Antioxidant Activity of Manganese Salts

In this paper, researchers looked into the potential of simple manganese or Mn salts to act as antioxidants. The team specifically focused on the superoxide dismutase-like activity of manganese salts. Superoxide dismutases are enzymes that help break down potentially harmful superoxide radicals in the body, which under normal circumstances could lead to oxidative stress and related damage. The researchers theorized that simple inorganic manganese salts, such as MnCl2, might serve the same purpose and tried testing this potential.

  • The first part of the study involved testing on buffer solutions. Here, researchers found a direct relation between the concentration of MnSO4 and the scavenging of the superoxide radicals indication a potential in Mn salts for this crucial enzymatic activity.
  • Further testing was done using an in vitro model involving rat liver slices. Data showed that different concentrations of MnCl2 led to a significant decrease in indicators of lipid peroxidation initiated by intracellular superoxide, providing further basis for their hypothesis.

Effectiveness in Horses

After initial testing, the research team wanted to see the effects of MnCl2 as a superoxide scavenger in a living organism – for the purpose of this study, horses were chosen. They measured the superoxide scavenging ability of equine plasma before and during the intravenous infusion of a saline solution containing various concentrations of MnCl2

  • Findings revealed that plasma manganese concentrations increased with time and dosage of MnCl2.
  • At the same time, MnCl2 infusions also showed a dose-related increase in the ability of equine plasma to scavenge superoxide radicals, providing substantial evidence to the therapeutic benefits of Mn salts.

In conclusion, this research presents promising preliminary data on the potential use of inexpensive manganese salts as an antioxidant drug, which opens doors for further research and drug development.

Cite This Article

APA
Singh RK, Kooreman KM, Babbs CF, Fessler JF, Salaris SC, Pham J. (1992). Potential use of simple manganese salts as antioxidant drugs in horses. Am J Vet Res, 53(10), 1822-1829.

Publication

ISSN: 0002-9645
NlmUniqueID: 0375011
Country: United States
Language: English
Volume: 53
Issue: 10
Pages: 1822-1829

Researcher Affiliations

Singh, R K
  • Department of Veterinary Physiology and Pharmacology, Purdue University, West Lafayette, IN 47907.
Kooreman, K M
    Babbs, C F
      Fessler, J F
        Salaris, S C
          Pham, J

            MeSH Terms

            • Analysis of Variance
            • Animals
            • Antioxidants / pharmacology
            • Blood Pressure / drug effects
            • Chlorides
            • Free Radical Scavengers
            • Heart Rate / drug effects
            • Horses / metabolism
            • In Vitro Techniques
            • Malondialdehyde / metabolism
            • Manganese / blood
            • Manganese / pharmacology
            • Manganese Compounds
            • Nitroblue Tetrazolium / metabolism
            • Rats

            Grant Funding

            • HL-35996 / NHLBI NIH HHS
            • HL-36712 / NHLBI NIH HHS

            Citations

            This article has been cited 4 times.
            1. Juttukonda LJ, Beavers WN, Unsihuay D, Kim K, Pishchany G, Horning KJ, Weiss A, Al-Tameemi H, Boyd JM, Sulikowski GA, Bowman AB, Skaar EP. A Small-Molecule Modulator of Metal Homeostasis in Gram-Positive Pathogens.. mBio 2020 Oct 27;11(5).
              doi: 10.1128/mBio.02555-20pubmed: 33109764google scholar: lookup
            2. Deng W, Faiq MA, Liu C, Adi V, Chan KC. Applications of Manganese-Enhanced Magnetic Resonance Imaging in Ophthalmology and Visual Neuroscience.. Front Neural Circuits 2019;13:35.
              doi: 10.3389/fncir.2019.00035pubmed: 31156399google scholar: lookup
            3. Chan KC, Zhou IY, Liu SS, van der Merwe Y, Fan SJ, Hung VK, Chung SK, Wu WT, So KF, Wu EX. Longitudinal Assessments of Normal and Perilesional Tissues in Focal Brain Ischemia and Partial Optic Nerve Injury with Manganese-enhanced MRI.. Sci Rep 2017 Feb 23;7:43124.
              doi: 10.1038/srep43124pubmed: 28230106google scholar: lookup
            4. Valachová K, Kogan G, Gemeiner P, Soltés L. Protective effects of manganese(II) chloride on hyaluronan degradation by oxidative system ascorbate plus cupric chloride.. Interdiscip Toxicol 2010 Mar;3(1):26-34.
              doi: 10.2478/v10102-010-0001-7pubmed: 21217868google scholar: lookup