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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Endocrinology
2017 ; 158
(5
): 1130-1139
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Acute Parathyroid Hormone Injection Increases C-Terminal but Not Intact
Fibroblast Growth Factor 23 Levels
#MMPMID28324013
Knab VM
; Corbin B
; Andrukhova O
; Hum JM
; Ni P
; Rabadi S
; Maeda A
; White KE
; Erben RG
; Jüppner H
; Christov M
Endocrinology
2017[May]; 158
(5
): 1130-1139
PMID28324013
show ga
The acute effects of parathyroid hormone (PTH) on fibroblast growth factor 23
(FGF23) in vivo are not well understood. After a single subcutaneous PTH (1-34)
injection (50 nmol/kg) in mice, FGF23 levels were assessed in plasma using assays
that measure either intact alone (iFGF23) or intact/C-terminal FGF23 (cFGF23).
Furthermore, FGF23 messenger RNA (mRNA) and protein levels were assessed in bone.
In addition, we examined the effects of PTH treatment on FGF23 production in
vitro using differentiated calvarial osteocyte-like cells. cFGF23 levels
increased by three- to fivefold within 2 hours following PTH injection, which
returned to baseline by 4 hours. In contrast, iFGF23 levels remained unchanged
for the first 2 hours, yet declined to ?60% by 6 hours and remained suppressed
before returning to baseline after 24 hours. Using homozygous mice for an
autosomal dominant hypophosphatemic rickets-FGF23 mutation or animals treated
with a furin inhibitor, we showed that cFGF23 and iFGF23 levels increased
equivalently after PTH injection. These findings are consistent with increased
FGF23 production in bone, yet rapid cleavage of the secreted intact protein.
Using primary osteocyte-like cell cultures, we showed that PTH increased FGF23
mRNA expression through cyclic adenosine monophosphate/protein kinase A, but not
inositol triphosphate/protein kinase C signaling; PTH also increased furin
protein levels. In conclusion, PTH injection rapidly increases FGF23 production
in bone in vivo and in vitro. However, iFGF23 is rapidly degraded. At later time
points through an unidentified mechanism, a sustained decrease in FGF23
production occurs.