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2016 ; 2
(2
): 98-105
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Cenderitide: structural requirements for the creation of a novel dual particulate
guanylyl cyclase receptor agonist with renal-enhancing in vivo and ex vivo
actions
#MMPMID27340557
Lee CY
; Huntley BK
; McCormick DJ
; Ichiki T
; Sangaralingham SJ
; Lisy O
; Burnett JC Jr
Eur Heart J Cardiovasc Pharmacother
2016[Apr]; 2
(2
): 98-105
PMID27340557
show ga
AIMS: Cenderitide is a novel dual natriuretic peptide (NP) receptor chimeric
peptide activator, which targets the particulate guanylyl cyclase B (pGC-B)
receptor and pGC-A unlike native NPs. Cenderitide was engineered to retain the
anti-fibrotic properties of C-type natriuretic peptide (CNP)/pGC-B with
renal-enhancing actions facilitated by fusion to the carboxyl terminus of
Dendroaspis NP (DNP), a pGC-A agonist, to CNP. Here, we address significance of
the DNP carboxyl terminus in dual pGC receptor activation and actions of
cenderitide compared with CNP on renal function and cyclic guanosine
monophosphate (cGMP) in vivo and ex vivo in normal canines. METHODS AND RESULTS:
In vitro, only cenderitide and not CNP or three CNP-based variants was a potent
dual pGC-A/pGC-B activator of cGMP production (from 5 to 237 pmol/mL) in human
embryonic kidney (HEK) 293 cells overexpressing human pGC-A while in pGC-B
overexpressing cells cenderitide increased cGMP production (from 4 to 321
pmol/mL) while the three CNP-based variants were weak agonists. Based upon our
finding that the DNP carboxyl terminus is a key structural requirement for dual
pGC-A/pGC-B activation, we defined in vivo the renal-enhancing actions of
cenderitide compared with CNP. Cenderitide increased urinary cGMP excretion (from
989 to 5977 pmol/mL), net generation of renal cGMP (821-4124 pmol/min),
natriuresis (12-242 ?Eq/min), and glomerular filtration rate (GFR) (37-51 mL/min)
while CNP did not. We then demonstrated the transformation of CNP ex vivo into a
renal cGMP-activating peptide which increased cGMP in freshly isolated glomeruli
eight-fold greater than CNP. CONCLUSION: The current study establishes that dual
pGC-A and pGC-B activation with CNP requires the specific carboxyl terminus of
DNP. In normal canines in vivo and in glomeruli ex vivo, the carboxyl terminus of
DNP transforms CNP into a natriuretic and GFR-enhancing peptide. Future studies
of cenderitide are warranted in cardiorenal disease states to explore its
efficacy in overall cardiorenal homeostasis.