Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology · 2014
Role of calcium channels in the protective effect of hydrogen sulfide in rat cardiomyoblasts.
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Avanzato Daniele, Merlino Annalisa, Porrera Sabina, Wang Rui, Munaron Luca, Mancardi Daniele
Аннотация
BACKGROUND: Hydrogen sulfide contributes to the reduction of oxidative stress-related injury in cardiomyocytes but the underlying mechanism is still unclear.
AIMS: Here we investigated the role of voltage-operated calcium channels (VOCCs) as mediators of the beneficial effect of H2S against oxidative stress in cultured rat cardiomyoblasts (H9c2).
METHODS: Intracellular calcium signals were measured by fluorimetric live cell imaging and cell viability by colorimetric assay.
RESULTS: Treatment with H2S donor (NaHS 10 µM) or Nifedipine (10 µM) decreased resting intracellular calcium concentration [Ca]i, suggesting that L-type VOCCs are negatively modulated by H2S. In the presence of Nifedipine H2S was still able to lower [Ca]i, while co-incubation with Nifedipine and Ni(2+) 100 µM completely prevented H2S-dependent [Ca]i decrease, suggesting that both L-type and T-type VOCCs are inhibited by H2S. In addition, in the same experimental conditions, H2S triggered a slow increase of [Ca]i whose molecular nature remains to be clarified. Pretreatment of H9c2 with NaHS (10 µM) significantly prevented cell death induced by H2O2. This effect was mimicked by pretreatment with L-Type calcium channel inhibitor Nifedipine (10 µM).
CONCLUSIONS: The data provide the first evidence that H2S protects rat cardiomyoblasts against oxidative challenge through the inhibition of L-type calcium channels.
AIMS: Here we investigated the role of voltage-operated calcium channels (VOCCs) as mediators of the beneficial effect of H2S against oxidative stress in cultured rat cardiomyoblasts (H9c2).
METHODS: Intracellular calcium signals were measured by fluorimetric live cell imaging and cell viability by colorimetric assay.
RESULTS: Treatment with H2S donor (NaHS 10 µM) or Nifedipine (10 µM) decreased resting intracellular calcium concentration [Ca]i, suggesting that L-type VOCCs are negatively modulated by H2S. In the presence of Nifedipine H2S was still able to lower [Ca]i, while co-incubation with Nifedipine and Ni(2+) 100 µM completely prevented H2S-dependent [Ca]i decrease, suggesting that both L-type and T-type VOCCs are inhibited by H2S. In addition, in the same experimental conditions, H2S triggered a slow increase of [Ca]i whose molecular nature remains to be clarified. Pretreatment of H9c2 with NaHS (10 µM) significantly prevented cell death induced by H2O2. This effect was mimicked by pretreatment with L-Type calcium channel inhibitor Nifedipine (10 µM).
CONCLUSIONS: The data provide the first evidence that H2S protects rat cardiomyoblasts against oxidative challenge through the inhibition of L-type calcium channels.