Objective: To study the effects of etimicin (EM) and gentamicin (GM) on renal endoplasmic reticulum 45 Ca 2+ uptake and Ca 2+ Mg 2+ ATPase activity. Methods: Using 45 Ca 2+ inc...Objective: To study the effects of etimicin (EM) and gentamicin (GM) on renal endoplasmic reticulum 45 Ca 2+ uptake and Ca 2+ Mg 2+ ATPase activity. Methods: Using 45 Ca 2+ incorporation technique and peacock blue spectrophotometry respectively. Results: EM and GM (≥3.4×10 4 mol·L 1 ) inhibited endoplasmic reticulum 45 Ca 2+ uptake (the rate of inhibition: ≥17.4% and ≥25.5%, respectively); EM and GM (3.4×10 2 mol·L 1 ) inhibited Ca 2+ Mg 2+ ATPase activity (the rate of inhibition: 24.2% and 29.2%, respectively). Conclusion: At high concentration, EM and GM elevated intracellular calcium which may be related to their nephrotoxicity.展开更多
Under NaCl stress for 2 d, H+-ATPase activity increased, and H+-PPase activity decreased in the tonoplast of salt-tolerant barley ( Hordeum vulgare L. cv. 'Tanyin 2') roots. La3+ (1 mmol/L), an inhibitor of Ca...Under NaCl stress for 2 d, H+-ATPase activity increased, and H+-PPase activity decreased in the tonoplast of salt-tolerant barley ( Hordeum vulgare L. cv. 'Tanyin 2') roots. La3+ (1 mmol/L), an inhibitor of Ca2+ channel in plasma membrane, and EGTA (5 mmol/L), a Ca2+ chelator, inhibited this NaCl-induced increase in H+-ATPase activity but stimulated the H+-PPase activity. Treatment of barley roots with CaM antagonist (trifluoperazine, TFP, 20 mumol/L) also diminished the increase of H+-ATPase activity induced by NaCl. La3+, TFP or La3+ + TFP increased Na+ uptake and decreased K+ and Ca2+ uptake in barley roots under NaCl stress. These results suggested that the activation of tonoplast H+-ATPase and the regulation of Na+ and K+ uptake under NaCl stress may be related to Ca2+-CaM system.展开更多
文摘Objective: To study the effects of etimicin (EM) and gentamicin (GM) on renal endoplasmic reticulum 45 Ca 2+ uptake and Ca 2+ Mg 2+ ATPase activity. Methods: Using 45 Ca 2+ incorporation technique and peacock blue spectrophotometry respectively. Results: EM and GM (≥3.4×10 4 mol·L 1 ) inhibited endoplasmic reticulum 45 Ca 2+ uptake (the rate of inhibition: ≥17.4% and ≥25.5%, respectively); EM and GM (3.4×10 2 mol·L 1 ) inhibited Ca 2+ Mg 2+ ATPase activity (the rate of inhibition: 24.2% and 29.2%, respectively). Conclusion: At high concentration, EM and GM elevated intracellular calcium which may be related to their nephrotoxicity.
文摘Under NaCl stress for 2 d, H+-ATPase activity increased, and H+-PPase activity decreased in the tonoplast of salt-tolerant barley ( Hordeum vulgare L. cv. 'Tanyin 2') roots. La3+ (1 mmol/L), an inhibitor of Ca2+ channel in plasma membrane, and EGTA (5 mmol/L), a Ca2+ chelator, inhibited this NaCl-induced increase in H+-ATPase activity but stimulated the H+-PPase activity. Treatment of barley roots with CaM antagonist (trifluoperazine, TFP, 20 mumol/L) also diminished the increase of H+-ATPase activity induced by NaCl. La3+, TFP or La3+ + TFP increased Na+ uptake and decreased K+ and Ca2+ uptake in barley roots under NaCl stress. These results suggested that the activation of tonoplast H+-ATPase and the regulation of Na+ and K+ uptake under NaCl stress may be related to Ca2+-CaM system.
