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2015 ; 156
(9
): 3114-21
Nephropedia Template TP
gab.com Text
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English Wikipedia
The Calcilytic Agent NPS 2143 Rectifies Hypocalcemia in a Mouse Model With an
Activating Calcium-Sensing Receptor (CaSR) Mutation: Relevance to Autosomal
Dominant Hypocalcemia Type 1 (ADH1)
#MMPMID26052899
Hannan FM
; Walls GV
; Babinsky VN
; Nesbit MA
; Kallay E
; Hough TA
; Fraser WD
; Cox RD
; Hu J
; Spiegel AM
; Thakker RV
Endocrinology
2015[Sep]; 156
(9
): 3114-21
PMID26052899
show ga
Autosomal dominant hypocalcemia type 1 (ADH1) is caused by germline
gain-of-function mutations of the calcium-sensing receptor (CaSR) and may lead to
symptomatic hypocalcemia, inappropriately low serum PTH concentrations and
hypercalciuria. Negative allosteric CaSR modulators, known as calcilytics, have
been shown to normalize the gain-of-function associated with ADH-causing CaSR
mutations in vitro and represent a potential targeted therapy for ADH1. However,
the effectiveness of calcilytic drugs for the treatment of ADH1-associated
hypocalcemia remains to be established. We have investigated NPS 2143, a
calcilytic compound, for the treatment of ADH1 by in vitro and in vivo studies
involving a mouse model, known as Nuf, which harbors a gain-of-function CaSR
mutation, Leu723Gln. Wild-type (Leu723) and Nuf mutant (Gln723) CaSRs were
expressed in HEK293 cells, and the effect of NPS 2143 on their intracellular
calcium responses was determined by flow cytometry. NPS 2143 was also
administered as a single ip bolus to wild-type and Nuf mice and plasma
concentrations of calcium and PTH, and urinary calcium excretion measured. In
vitro administration of NPS 2143 decreased the intracellular calcium responses of
HEK293 cells expressing the mutant Gln723 CaSR in a dose-dependent manner,
thereby rectifying the gain-of-function associated with the Nuf mouse CaSR
mutation. Intraperitoneal injection of NPS 2143 in Nuf mice led to significant
increases in plasma calcium and PTH without elevating urinary calcium excretion.
These studies of a mouse model with an activating CaSR mutation demonstrate NPS
2143 to normalize the gain-of-function causing ADH1 and improve the hypocalcemia
associated with this disorder.