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Prognostic Circulating Neprilysin and
Therapeutic Neprilysin Inhibition
Antoni Bayes-GenisChair, Heart Institute
Hospital Univesitari Germans Trias i Pujol
Badalona, Barcelona, Spain
HF Epidemic… in the WORLD
…. In US and Western Europe
1 in 5 individuals > 40 years will develop HF
HF unmet needs?
Excessive mortality despite neurohormonal blockade
HF progresses and mortality remains high
despite optimal neurohormonal blockade
McMurray. Eur J Heart Fail. 2011;13:929–36
Sudden death accounts for 50% of HF mortality
MERIT-HF Study Group. Lancet. 1999;353:2001-7
Too many HF admissions and readmissions
Centers for Medicare & Medicaid Services. Medicare Provider Utilization and Payment Data: Inpatient. 2013
… and poor quality of life
HT diabetes arthritis COPD angina HF Better
worse
McMurray J. Eur Heart J 1998; 19 (supp. P): P9
New Mechanism of action: Neprilysin inhibition
Levin et al. N Engl J Med 1998;339:321–8; Nathisuwan & Talbert. Pharmacotherapy 2002;22:27–42; Kemp & Conte. Cardiovascular Pathology 2012;365-71;
Schrier et al. Kidney Int 2000;57:1418-25; Schrier & Abraham N Engl J Med 1999;341:577–85; Boerrigter & Burnett. Expert Opin Invest Drugs 2004;13:643–
52; Ferro et al. Circulation 1998;97:2323–30; Brewster et al. Am J Med Sci 2003;326:15–24
SNS
RAAS
VasoconstrictionBlood pressure
Sympathetic toneAldosteroneHypertrophy
Fibrosis
Ang II AT1R
HF SYMPTOMS&
PROGRESSION
INACTIVE
FRAGMENTS
NP system
VasodilationBlood pressureSympathetic toneNatriuresis/diuresisVasopressinAldosteroneFibrosisHypertrophy
NPRs NPs
Epinephrine
Norepinephrineα1, β1, β2
receptors
VasoconstrictionRAAS activityVasopressin
Heart rateContractility
Neprilysin
inhibitors
RAAS inhibitors
(ACEI, ARB, MRA)
β-blockers
CALLA(common acute
lymphocytic leukemia antigen)
Neprilysin (NEP)
Membrane Metallopeptidase
variant 1
Neutral Endopeptidease
24.11
CD 10Enkephalinase
Kerr MA, Kenny AJ. 1973; 137: 477-488.
Neprilysin: a long journey
Short NT Intracellular domain (27 aa)
Large CT Extracellular domain (55-750 aa)with a Zn atom at the active site
A single transmembrane helix
Mangiafico S, et al. Eur Heart J. 2013; 34: 886-893.
NEP: a “ubiquitous” transmembrane receptor
Primary sites of cleavage by NEP
on human ANP, BNP and CNP
Bayes-Genis A, Barallat J, Richards MR. J Am Coll Cardiol 2016;68:639-53
Interaction of individual NPs with neprilysin
Bayes-Genis A, Barallat J, Richards MR. J Am Coll Cardiol 2016;68:639-53
Endogenous vasoactive peptides
Vasodilators: NPs, adrenomedullin, bradykinin.
Vasoconstrictors: angiotensin I- II, endothelin 1.
Inactive metabollites
Other peptides
Opioids, substance P, gastrin, β-amyloid
NEP: a «promiscuous» transmembrane receptor
Bayes-Genis A, Barallat J, Richards MR. J Am Coll Cardiol 2016;68:639-53
Neprilysin has many substrates that are metabolized with differing levels of affinity
Metabolism of vasoactive peptides by NEP
ANP y CNP
Endothelin
Sustance P
Bradikinin
Ang II
Adrenomedullin
Ang I
Implications for NEP
inhibition
NEP substrates can have
opposing biological actions
Overall effect is dependent
upon the net effect on NEP
metabolism of individual
substrates
Benefits in enhancing NP
system may be offset by
increased Ang II
Needs to be complemented
by simultaneous RAAS
suppression
BNP
NEP
Inactive fragments ormetabolites
Relative
affinity
for NEP
NEP inhibition alone increases NPs and AT-II
AT1 receptor
Neprilysin(NEP)
Signaling cascades
Gene expression; ↑ protein synthesis; ↑ cell proliferation
NPR-A NPR-B
GTP GTP
cGMP
ANP BNP CNP
ANP/CNP
BNP
Internalization
Inactive peptides
Receptor recycling
Vasodilation
Cardiac fibrosis/hypertrophy
Natriuresis/diuresis
AT-IIInactive NP
fragmentsANP/CNP
BNP
Vasoconstriction
Cardiac fibrosis/hypertrophy
Sodium/water retention
NPR-C
Inactive AT-II
fragmentsAT-II
Neprilysin(NEP)
AT1 receptorNeprilysin
Signaling
cascades
Gene expression; ↑ protein
synthesis; ↑ cell proliferation
NPR-A NPR-B NPR-C
GTP GTP
cGMP
ANPBNP CNP
ANP/CNP/BNP
Internalization
Inactive peptides
Vasodilation
Cardiac fibrosis/hypertrophy
Natriuresis/diuresis
Vasoconstriction
Cardiac fibrosis/hypertrophy
Sodium/water retention
Inactive NP
fragments ANP/CNP
LCZ696
ValsartanSacubitril
Ang II
Enhancing the natriuretic peptide system
Supressingthe RAAS
Receptor
recyclingSignaling
cascades
Gene expression; ↑ protein
synthesis; ↑ cell proliferation
Vasoconstriction
Cardiac fibrosis/hypertrophy
Sodium/water retention
Sac/Val in the Angiotensin pathway
LCZ696
Vasodilation
Anti-fibrosis
Anti-proliferation
Natriuresis
Death from CV causes or first hospitalization for HF
Hazard ratio = 0.80 (95% CI: 0.73–0.87)
p<0.001
Days since randomization
Cu
mu
lati
ve p
rob
ab
ilit
y1.0
0.6
0.4
0.2
0
0 180 360 540 720 900 1080 1260
Enalapril
LCZ696
McMurray et al. N Engl J Med. 2014;37:993-1004
20% Reduction
Sudden Death
Desai et al. Eur Heart J. 2015;36:1990–7
20% Reduction
30- and 60-day HF readmissions
Desai et al. J Am Coll Cardiol 2016;68:241-8
Is it safe?
Hypotension Renal impairment HyperkalaemiaAny adverse event
LCZ696 (n=4187)
Enalapril (n=4212)
0
5
10
15 p=0.03
p=0.38 p=0.002p=0.56
0.70.91.4
0.7 0.40.3
12.3
10.7
stu
dy
dru
g d
isco
nti
nu
ed
(%
)
McMurray et al. N Engl J Med. 2014;37:993-1004
Active
bradykinin
Inactive
bradykinin
ACE APP NEP DPP-4
Bradykinin breakdown
Omapatrilat
Sac/Val Active
bradykinin
Inactive
bradykinin
What about biomarkers?
YES
cleaved by NEP
NOT
cleaved by NEP
Bayes-Genis A et al. J Am Coll Cardiol 2016;68:639-53; Ichiki & Burnett. Circulation 2010;122:229–32
400
600
1,000
1,400
1,600
1,200
800
***
***
LCZ696Enalapril
NT-p
roB
NP, p
g/m
L
LCZ696 significantly reduced levels of NT-proBNP
Packer et al. Circulation 2015;131:54–61;
1,000 pg/mLEnalapril LCZ696
***p<0.0001
V2/2aPrior to enalapril
run-in
V5Randomization
V7
4 weeks
V10
8 months
V3After enalapril run-in/
prior to LCZ696 run-in
Sustained BNP reflects NEP inhibition with LCZ696
Packer et al. Circulation 2015;131:54–61
50
100
150
200
250***
***
***p<0.0001
V2/2aPrior to enalapril
run-in
V5
Randomization
V7
4 weeks
V10
8 months
V3After enalapril run-in/
prior to LCZ696 run-in
Enalapril LCZ696
BN
P,
pg/m
L
LCZ696Enalapril
...So, what NP should I use: BNP or NT-proBNP?
NT-proBNP: remains a good biomarker for diagnosis, prognosis, monitoring
BNP: changes its role from biomarker to biotarget
NEP may be found as a circulating peptide: sNEP
NEP extracellular domain, Human 55-750
Large CT Extracellular domain (55-750 aa)
with a Zn atom at the active site
Rho 0.49, p<0.001
Is sNEP catalytically active?
Bayes-Genis A, et al. J Heart Lung Transpl 2016;35:684-5.
sNEP and prognosis in chronic HF
Bayes-Genis A, et al. J Am Coll Cardiol. 2015; 65: 657.
Composite Primary Endpoint Cardiovascular Death
HR 95% CI P value HR 95% CI P value
sNEP 1.18 1.07 - 1.31 0.001 1.18 1.05 - 1.32 0.006
18% Increased Risk
sNEP vs. NTproBNP: eGFR and BMI
Bayes-Genis A, et al. Rev Esp Cardiol 2015; 68:1075-84
sNEP in Acute HF
Bayés-Genís A, et al. JACC Heart Failure 2015;3:641-4.
• High sNEP in AHF with prognostic value argues in favour of initiating LCZ696 within hospital admission
Clinical studies using sNEP for HF prognostication
Bayes-Genis A, Barallat J, Richards MR. J Am Coll Cardiol 2016;68:639-53
Performance of the marketed sNEP assays
Bayes-Genis A, Barallat J, Richards MR. J Am Coll Cardiol 2016;68:639-53
Take-home message
Bayes-Genis A, Barallat J, Richards MR. J Am Coll Cardiol 2016;68:639-53
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