What question did this study set out to answer?

To determine how calcitonin and cyclic AMP regulate Na(+)-K(+)-Cl- cotransport in a rabbit thick ascending limb cell model.

September 1, 1992AJP Cell Physiology

Regulation by calcitonin of Na(+)-K(+)-Cl- cotransport in a rabbit thick ascending limb cell line

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Authors

TVThomas VuilleminMerck Serono (Switzerland)JTJacques TeulonDélégation Paris 5 MGMonique Geniteau‐LegendreUniversité Paris-Sud

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Implication

In vitro study demonstrates that calcitonin stimulates Na-K-Cl cotransport via cAMP in thick ascending limb cells, indicating potassium recycling modulates hormone-driven ion flux.

Key Points

To determine how calcitonin and cyclic AMP regulate Na(+)-K(+)-Cl- cotransport in a rabbit thick ascending limb cell model.
Utilized SV40-transformed rabbit thick ascending limb cells (RC.SV2) expressing Tamm-Horsfall protein and responsive to calcitonin.
Conducted kinetic tracer flux assays with 22Na+, 36Cl-, and 86Rb+ to characterize the stoichiometry and maximal velocity of the Na(+)-K(+)-Cl- cotransporter under calcitonin exposure (100 ng/ml).
Tested the inhibitory effects of the potassium channel blocker barium and the chloride channel blocker NPPB on calcitonin-stimulated ion uptake.
Calcitonin (100 ng/ml) doubled the ouabain-resistant, bumetanide-sensitive Rb+ influx by increasing maximum velocity without altering the apparent Michaelis constant.
Inhibition of potassium channels with barium reduced the calcitonin-stimulated Rb+ influx by 64% to 74%.
Inhibition of chloride channels with 5-nitro-2-(3-phenylpropylamino)benzoate blunted the calcitonin-stimulated Rb+ influx by 28% to 40%.

Cite This Study

Vuillemin et al. (1992) studied this question.

synapsesocial.com/papers/6aa78a1241a3eb417e4f2762 https://doi.org/10.1152/ajpcell.1992.263.3.c563

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Implication

In vitro study demonstrates that calcitonin stimulates Na-K-Cl cotransport via cAMP in thick ascending limb cells, indicating potassium recycling modulates hormone-driven ion flux.

Regulation by calcitonin of Na(+)-K(+)-Cl- cotransport in a rabbit thick ascending limb cell line

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Implication

Key Points

Cite This Study

Regulation by calcitonin of Na(+)-K(+)-Cl- cotransport in a rabbit thick ascending limb cell line

Discussion

Member takes

Implication

Key Points

Cite This Study

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