A five amino acids deletion in NKCC2 of C57BL/6 mice affects analysis of NKCC2 phosphorylation but does not impact kidney function.

Acta Physiologica
Sandra MoserJohannes Loffing

Abstract

The phosphorylation level of the furosemide-sensitive Na+ -K+ -2Cl- cotransporter (NKCC2) in the thick ascending limb (TAL) is used as a surrogate marker for NKCC2 activation and TAL function. However, in mice, analyses of NKCC2 phosphorylation with antibodies against phosphorylated threonines 96 and 101 (anti-pT96/pT101) give inconsistent results. We aimed (a) to elucidate these inconsistencies and (b) to develop a phosphoform-specific antibody that ensures reliable detection of NKCC2 phosphorylation in mice. Genetic information, molecular biology, biochemical techniques and mouse phenotyping was used to study NKCC2 and kidney function in two commonly used mouse strains (ie 129Sv and in C57BL/6 mice). Moreover, a new phosphoform-specific mouse NKCC2 antibody was developed and characterized. Amino acids sequence alignment revealed that C57BL/6 mice have a strain-specific five amino acids deletion (ΔF97-T101) in NKCC2 that diminishes the detection of NKCC2 phosphorylation with previously developed pT96/pT101 NKCC2 antibodies. Instead, the antibodies cross-react with the phosphorylated thiazide-sensitive NaCl cotransporter (NCC), which can obscure interpretation of results. Interestingly, the deletion in NKCC2 does not impact on ...Continue Reading

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Citations

Oct 7, 2021·American Journal of Physiology. Cell Physiology·Diana L Torres-PinzonAlicia A McDonough

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