Influence of monensin on cation influx and Na+ -K+ -ATPase activity of Eimeria tenella sporozoites in vitro.
The experiments were conducted to determine intrasporozoite Na+/K+ concentrations (by AAS) and membrane-bound Na+ -K+ -ATPase activity (measured by UV-VIS with a Na+ -K+ -ATPase Detection Kit) of Eimeria tenella sporozoites of the sensitive line (i.e., the parent line, coded as OS) and 2 resistant lines, derived from the parent line (coded as OR125 and OR200), with and without in vitro exposure to monensin. These parameters for OR125 and OR200 were significantly lower than those for OS. In vitro exposure to monensin increased intrasporozoite Na+/K+ concentrations and Na+ -K+ -ATPase activity, but the stimulation on OS was significantly higher than those on OR125 and OR200, indicating that monensin had less effect on resistant parasites. The results of this study suggest that altered biochemical or physiological properties, or both, in the membranes of E. tenella might be related to a reduced sensitivity to monensin.
Wang
Zhuo
Z
Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Beijing 100094, PR China.
Suo
Xun
X
Xia
Xi
X
Shen
Jianzhong
J
D000818:Animals; D002645:Chickens; D003048:Coccidiosis / Q000188:drug therapy / Q000469:parasitology; D003049:Coccidiostats / Q000494:pharmacology* / Q000627:therapeutic use; D004305:Dose-Response Relationship, Drug; D004351:Drug Resistance; D016786:Eimeria tenella / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D008985:Monensin / Q000494:pharmacology* / Q000627:therapeutic use; D011188:Potassium / Q000378:metabolism*; D011897:Random Allocation; D012964:Sodium / Q000378:metabolism*; D000254:Sodium-Potassium-Exchanging ATPase / Q000187:drug effects / Q000378:metabolism*; D034101:Sporozoites / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism
D003049:Coccidiostats; D008985:Monensin; D012964:Sodium; D000254:Sodium-Potassium-Exchanging ATPase; D011188:Potassium