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Protective effect of ambroxol against heat- and hydrogen peroxide-induced damage to lung lipids in mice
D Nowak1, A Antczak, T Pietras
1Dept of Pneumology and Allergology, Medical University of Lodz, Poland.
Abstract:
We wanted to determine whether ambroxol, a drug which stimulates the release of surfactant by type II pneumocytes, can protect lung lipids from peroxidative damage in mice. Animals were injected intraperitoneally with ambroxol, 0.169 mmol.kg-1, or 1 ml buffer once a day for three consecutive days. Lipid peroxidation was then induced in lung homogenates either by means of heat, 50 degrees C, or H2O2, 10 mmol.l-1. The lung homogenates from ambroxol-treated animals revealed decreased lipid peroxidation in response to both stimuli. The heat- and H2O2-induced generation of conjugated dienes (a first lipid peroxidation product) in ambroxol-treated lung homogenates was 3.7 and 3.1 fold lower than in the lungs from buffer-injected mice. Ambroxol, as an inhibitor of heat- and H2O2-induced lipid peroxidation, was equipotent to and stronger than the two antioxidants, N-acetylcysteine and methionine, respectively. Ambroxol was not able to protect heart and liver lipids. These results suggest that ambroxol can sufficiently enhance the antioxidant defence in lung tissue and can act as a lung lipid antioxidant.
Insights
Ambroxol, a drug stimulating surfactant release, protects lung lipids from peroxidative damage in mice. It acts as a lung-specific antioxidant, outperforming other antioxidants in preventing lipid peroxidation.
Area of Science:
- Biochemistry
- Pharmacology
- Pulmonary Medicine
Background:
- Lipid peroxidation is a significant contributor to lung injury.
- Ambroxol is known to stimulate surfactant release by type II pneumocytes.
- The antioxidant properties of ambroxol in lung tissue are not well-established.
Purpose of the Study:
- To investigate the potential of ambroxol to protect lung lipids against peroxidative damage.
- To compare the efficacy of ambroxol with known antioxidants in preventing lipid peroxidation in lung homogenates.
Main Methods:
- Mice were treated with ambroxol or buffer intraperitoneally for three days.
- Lipid peroxidation was induced in lung homogenates using heat or hydrogen peroxide (H2O2).
- The generation of conjugated dienes, a marker of lipid peroxidation, was quantified.
Main Results:
- Ambroxol treatment significantly reduced heat- and H2O2-induced lipid peroxidation in lung homogenates.
- Conjugated diene generation was 3.7-fold lower with heat and 3.1-fold lower with H2O2 in ambroxol-treated lungs compared to controls.
- Ambroxol demonstrated comparable or superior antioxidant activity to N-acetylcysteine and methionine.
Conclusions:
- Ambroxol enhances the antioxidant defense mechanisms specifically within lung tissue.
- Ambroxol functions as an effective antioxidant for lung lipids, protecting them from peroxidative damage.
- The protective effect appears localized to the lungs, as heart and liver lipids were not protected.