Title : Calmodulin-mediated effects of loperamide on chloride transport by brush border membrane vesicles from human ileum.

Pub. Date : 1988 Jul

PMID : 2836258






7 Functional Relationships(s)
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1 Calmodulin-mediated effects of loperamide on chloride transport by brush border membrane vesicles from human ileum. Loperamide calmodulin 1 Homo sapiens
2 In addition, we studied the role of Ca2+/calmodulin in the action of loperamide on chloride transport by human BBMVs. Loperamide calmodulin 1 Homo sapiens
3 In loperamide-pretreated BBMVs, calmodulin activity was significantly decreased (12 +/- 2 vs. 38 +/- 4 pmol/mg protein). Loperamide calmodulin 1 Homo sapiens
4 When loperamide-pretreated vesicles were incubated with 2 microM calcium (free concentration) plus 5 microM calmodulin for 1 h at 5 degrees C, complete inhibition of the stimulatory effect of loperamide on Cl-/OH- antiport and Na+/Cl- cotransport was observed. Loperamide calmodulin 1 Homo sapiens
5 When loperamide-pretreated vesicles were incubated with 2 microM calcium (free concentration) plus 5 microM calmodulin for 1 h at 5 degrees C, complete inhibition of the stimulatory effect of loperamide on Cl-/OH- antiport and Na+/Cl- cotransport was observed. Loperamide calmodulin 1 Homo sapiens
6 Increasing the Ca2+/calmodulin activity of loperamide-pretreated BBMVs with 2 microM calcium plus 5 microM calmodulin led to a significant inhibition of Cl-/OH- antiport and Na+/Cl- cotransport by 40% +/- 5% (p less than 0.005). Loperamide calmodulin 1 Homo sapiens
7 Increasing the Ca2+/calmodulin activity of loperamide-pretreated BBMVs with 2 microM calcium plus 5 microM calmodulin led to a significant inhibition of Cl-/OH- antiport and Na+/Cl- cotransport by 40% +/- 5% (p less than 0.005). Loperamide calmodulin 1 Homo sapiens