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2011 ; 2
(3
): 238-42
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Discovery of a potent and short-acting oral calcilytic with a pulsatile secretion
of parathyroid hormone
#MMPMID24900301
Shinagawa Y
; Inoue T
; Katsushima T
; Kiguchi T
; Ikenogami T
; Ogawa N
; Fukuda K
; Hirata K
; Harada K
; Takagi M
; Nakagawa T
; Kimura S
; Matsuo Y
; Maekawa M
; Hayashi M
; Soejima Y
; Takahashi M
; Shindo M
; Hashimoto H
ACS Med Chem Lett
2011[Mar]; 2
(3
): 238-42
PMID24900301
show ga
Short-acting oral calcilytics, calcium-sensing receptor (CaSR) antagonists, have
been considered as alternatives for parathyroid hormone (PTH), an injectable bone
anabolic drug used in the treatment of osteoporosis. Previously, we identified
aminopropandiol 1, which transiently stimulated endogenous PTH secretion in rats.
However, the inhibition of cytochrome P450 (CYP) 2D6 and the low bioavailability
of 1 remain to be solved. Attempts to change the physicochemical properties of
the highly lipophilic amine 1 by introduction of a carboxylic acid group as well
as further structural modifications led to the discovery of the highly potent
biphenylcarboxylic acid 15, with a markedly reduced CYP2D6 inhibition and a
significantly improved bioavailability. Compound 15 evoked a rapid and transient
elevation of endogenous PTH levels in rats after oral administration in a
dose-dependent manner at a dose as low as 1 mg/kg. The PTH secretion pattern
correlated with the pharmacokinetic profile and agreed well with that of the
exogenous PTH injection which exerts a bone anabolic effect.