antimalarial combination therapy: lessons from mitochondrial physiology · 2010. 4. 7. · fevzi...
TRANSCRIPT
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Antimalarial combination therapy: lessons from
mitochondrial physiology
Akhil B. Vaidya Drexel University College of Medicine
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The Challenge of Feeding the Pipeline
• Resistance to currently used combination therapies will arise • Development of new drugs is a long process with many failures
on the way (90%?; 99%?)• Need to have a strategy that will feed the pipeline for a long
period (50 years?; 100 years?)• Basic understanding of parasite physiology and mechanisms of
drug action is essential for an informed strategy for drug development pipeline
• Drugs that work but for which MOAs are unknown should be subjected to in depth basic research to make informed decisions about their use in combination therapy
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The Story of Weird Mitochondria of Malaria
Parasites
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Plasmodium spp.
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Ubiquinone
Dihydroorotate dehydrogenaseNADH dehydrogenase (rotenone insensitive)
Succinate dehydrogenaseMalate-quinone oxidoreductase
Glycerol 3-phosphate dehydrogenase
Electrons
Ubiquinol
Cytochrome bc1 complex
Cytochrome c (ox.) Cytochrome c (red.)
Cytochrome c oxidase
O2 H2O
H+ translocated
H+ pumped
Atovaquone
Abbreviated Electron Transport Chain in Plasmodium Mitochondrion
Five Mitochondrial Dehydrogenases Located in the Inner Membrane
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O
OCH3
O
O
CH3
CH3
HCH3
9
Ubiquinone
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The Q Cycle of Complex III
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O
OCH3
O
O
CH3
CH3
HCH3
9
Ubiquinone
Cl
O
OOH
Atovaquone
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NADH
NAD+
Dihydroorotate
Orotate
Malate
OxaloacetateSuccinate
Fumarate
Q
QH2
H+
H+
c
c
c
UbiquinonesynthesisUbiquinonesynthesis
[Fe-S] clusterassembly[Fe-S] clusterassembly
HemebiosynthesisHemebiosynthesis
mtDNA
ReplicationRecombination Repair
ReplicationRecombination Repair
TranscriptionProcessingTranscriptionProcessing
PyrimidinebiosynthesisPyrimidinebiosynthesis
mRNA rRNA
ProteinsynthesisProteinsynthesis
3 proteinsATP synthase?
bc1complex
Cyt coxidase Cyt b
Cox1Cox3
Outermembrane
Innermembrane
Porin
Porin
MatrixCytoplasm
ProteinstRNAsMetabolites
Mitochondrial Functions inMalaria Parasites
Mitochondrial Functions inMitochondrial Functions inMalaria ParasitesMalaria Parasites
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CO2+H2O+ATP
GlutamineGlutamate
Carbamoyl-P N-carbamoyl-aspartate
Orotidine-5’-P
L-Aspatate
Dihydroorotate
Orotate
Uridine-5’-P
Carb
amoy
l-P s
ynth
ase
Aspa
rtyl c
arba
moy
l tra
nsfe
rase
Dihy
droo
rota
se
Dihydroorotate dehydrogenase
Orotate phosphoribosyl transferase
Orotidine-5’-P decarboxylase
UTPCTPTTPdCTP
RNADNA
CytosineUracil Deaminase;
Phosphoribosyltransferase
Pyrimidine Metabolism
Cytidine-5’-P
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NH
NH
O
OHO
HH H
O NH
NH
O
OHO
H
O
CoQ CoQH2
Type 2 DHODH
Dihydroorotate Orotate
Cytochrome bc1 Complex
Mitochondrion
Fumarate Succinate
Cytoplasm
Type 1A DHODH
Pyrimidines
Most Eukaryotes
Many prokaryotes;Saccharomyces cerevisiae
Two Types of Dihydroorotate Dehydrogenases (DHODH)Two Types of Dihydroorotate Dehydrogenases (DHODH)
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hDHFRGFP
pHHyDHOD-GFP
AntiAnti--GFP, GFP, MitotrackerMitotracker,, DAPIDAPI
2.7 kb
D10 D10::y
DHODD10 D10
::yDHOD
Painter et al. Nature 446:88-91, 2007
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Compound IC50 in D10 (wild type)
IC50 in D10:yDHOD
Atovaquone 1 nM >2,250 nMMyxothiazol 37 nM >3,300 nMAntimycin 129 nM >3,300 nMPyridone 59 nM >16,600 nMAcridone <50 pM >3,300 nMQuinolone 2.8 nM >1000 nMChloroquine 87 nM 62 nMArtemisinin 40 nM 40 nM
P. falciparum Expressing Type 1 DHODH Resistant to All Complex III Inhibitors
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•• Cytosolic bypass with yeast DHOD can Cytosolic bypass with yeast DHOD can render parasites independent of render parasites independent of mtETCmtETC
•• Any additional evidence to support this Any additional evidence to support this conclusion?conclusion?
•• Parasites that lose the transgene become Parasites that lose the transgene become susceptible to susceptible to mtETCmtETC inhibitorsinhibitors
•• Transgenic P. falciparum capable of Transgenic P. falciparum capable of salvaging pyrimidines are also resistant to salvaging pyrimidines are also resistant to mtETCmtETC inhibitorsinhibitors
So, what have we learned?
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Ubiquinone
Dihydroorotate dehydrogenaseNADH dehydrogenase (rotenone insensitive)
Succinate dehydrogenaseMalate-quinone oxidoreductase
Glycerol 3-phosphate dehydrogenase
Electrons
Ubiquinol
Cytochrome bc1 complex
Cytochrome c (ox.) Cytochrome c (red.)
Cytochrome c oxidase
O2 H2O
H+ translocated
H+ pumped
Atovaquone
The Essential Function of Mitochondrial Electron Transport Chain in Blood Stages of P. falciparum
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Uses of the mtETC-independent Parasites
• Providing support for target validation for new antimalarials with potential anti-mtETC activity
• Assessing mitochondrial functions through gene knockout
• Assessing possible off-target activities of new parasite DHOD inhibitors
• Providing new selectable markers for gene transfer and knockout experiments
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4(1H)-Pyridones• Clopidol has been used as an anti-coccidial
drug for over 30 years• GSK, Spain, re-initiated the work on
pyridones in 2002, supported by Medicines for Malaria Venture
• A lead compound identified and a large number of derivatives synthesized; cost likely to be low
• Plans are underway for initiating clinical trials
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O
OCH3
O
O
CH3
CH3
HCH3
9
Ubiquinone
O
N
OCl
O
FF
F
HGW844520
N
OCl Cl
H
Clopidol
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Parasite Clone (cyt b) Atovaquone GW844520 Stigmatellin
3D7 (WT) 0.3 21 --
3D7 (M133I) 4 1.6 --
Dd2 (WT) 1.2 33 48
Dd2 (M133I) 49 0.7 84
Dd2 (Y268N) >1000 4.9 --
IC50 for Compounds Targeting Cytochrome bc1 Complex
Atovaquone-resistant P. falciparum are hypersensitive to GW844520
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Compound used Seeded Parasites Drug Dose, nM (xIC50) Selection outcome* Days to emergence Experiment 1 Atovaquone 106 10 (10x) 0/2 -- 107 10 (10x) 2/2 42, 42 108 10 (10x) 2/2 28, 42 GW844520 106 300 (10x) 0/2 -- 107 300 (10x) 0/3 -- 108 300 (10x) 0/3 -- None 10 -- 1/1 13 Experiment 2 Atovaquone 107 10 (10x) 2/2 50, 50 108 10 (10x) 2/2 24, 38 GW844520 107 300 (10x) 0/3 -- 108 300 (10x) 0/3 -- None 10 -- 1/1 16 Experiment 3 GW844520 108 150 (5x) 0/3 -- 108 100 (3.3x) 0/3 --
Assessing Resistance Frequency in P. falciparum Clone Dd2
* Ratios represent number of flasks yielding resistant parasites after 8 weeks of treatment. Experiments were done as per Rathod et al. Variations in frequencies of drug resistance in Plasmodium falciparum. Proc Natl Acad Sci U S A 1997;94(17):9389-93.
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• 4(1H)-pyridones are active against atovaquone-resistant P. falciparum; these parasites are hypersensitive to some of the pyridones
• The frequency of pyridone resistance development in the Dd2 clone (a high frequency resistance developer) is lower than for atovaquone: >10-8 vs. 10-7
• Low level pyridone-resistant parasites show mutations within cytochrome b gene, but these do not affect atovaquone sensitivity
• The pyridone binding region appears to be distinct from atovaquone binding region in the parasite cytochrome bc1 complex
• Combination of two compounds with overlapping binding sites on the same target could be excellent for ACT
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OO
OOH
O
OO
Sigmatellin
S
N
SN
ONH2
O O Myxothiazol
NH
O
O F
CF3
CF3Cl
3-(5,6,6,6-Tetrafluoro-5-trifluormethyl-hexyloxy)-6-chloroacridoneNH
O
O
Endochin (quinolone)
O
N
OCl
O
FF
F
HGW844520
Cl
O
OOH
Atovaquone
O
OCH3
O
O
CH3
CH3
HCH3
9
Ubiquinone
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What about Malarone®
(Atovaquone/Proguanil Combination)?
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Are the transgenic parasites susceptible to the atovaquone/proguanil combination?
60nM 0.68nM
.2,500nM
55uM
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Proguanil Sensitizes yDHOD-Transgenic Parasites to All mtETC Inhibitors
IC50 (nM) Parasite Strain Proguanil
(1 μM) Atovaquone GW844520 Myxothiazol Antimycin Chloroquine
D10 -- 1.3 58.7 37.2 129.4 86.99
D10 + 0.23 37.8 14.9 71.45 62.6
D10::GFPyDHODH -- >2,250 >16,600 >3,300 >33,300 62.1
D10::GFPyDHODH + 0.68 45.01 21.9 67.44 62.7
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Atv
Atv
/Pro
D10::yDHgfp
Cont
rol
Cont
rol
Phase AntiAnti--GFPGFPMtkrMtkr, , DAPIDAPIPhase MtkrMtkr, , DAPIDAPID10
Collapse of ∆Ψm in Parasites Exposed to Atovaquone/Proguanil Combination
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H+
H+
H+
H+
ATP4-
ATP4-
ADP3-
ADP3-
Matrix (-)
Intermembrane Space (+)
Adenine Nucleotide
Carrier
F1 ATPase
Mitochondrial Phosphate
Carrier
Pi-
Pi-
OH-
OH-
H+
c
Cytbc1
complexQ QH2
(2.)(1.)Proguanil
DHO Orotate
DHODH
Atovaquone
Cyt coxidase
½ O2 H2O
e-
e-
? ?
?
H+
H+
H+
H+
H+
c
Cytbc1
complexQH2
Orotate
DHODH Cyt coxidase
½ O2
e-
e-
ATP4-
ATP4-
ADP3-
ADP3-
Adenine Nucleotide
Carrier
Mitochondrial Phosphate
Carrier
Pi-
Pi-
OH-
OH-
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• ∆pH portion of the protonmotive force across mitochondrial inner membrane force is dispensable for blood stage P. falciparum
• Electropotential (∆Ψm ) portion of the protonmotive force across mitochondrial membrane is essential, and the parasite has two redundant paths to generate it
• Mitochondrial transport systems cannot operate without ∆Ψm
• Mitochondria in malaria parasites are essential
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Is proguanil the ideal partner Is proguanil the ideal partner for atovaquone?for atovaquone?
(Is Malarone(Is Malarone®® formulation appropriate?)formulation appropriate?)
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CNH NH
NH
CCNH
NH H
CH3
CH3
Cl
CNH
NH
CNH
NH
Cl
NH2
Cl
N
N NCH3CH3
NH2
NH2
Proguanil
4-Chlorophenyl biguanide
Cycloguanil
P450 enzyme
Dealkylation
= Parasite DHFR Inhibitor
Proguanil Metabolism and Proguanil Metabolism and ActivationActivation
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• Proguanil seems to inhibit mitochondrial membrane potential generation, but its activity is masked by the dominant mitochondrial electron transport chain, the target for atovaquone
• Thus, atovaquone-resistant mutations in mtDNA will render proguanil ineffective as a prodrug partner
• Conversion to cycloguanil requires a CYP450 which is deficient in up to 25% of individuals
• Cycloguanil-resistant parasites are already wide-spread in S.E. Asia
• Malarone failure is beginning to be seen in various parts of the world
• It may be advisable to seek an alternative partner for atovaquone to save its efficacy; this may become important when Malarone goes off patent
• The decision about a partner for other mtETCinhibitors under development should be informed by these findings
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Joanne Morrisey
Heather Painter
Mike Mather
Jim Burns Bill Bergman
Acknowledgements
Tom Daly
Hangjun Ke
Praveen Kamal
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Andy Waters
Alan Cowman
Fevzi Daldal
Pradip Rathod
Bruce Palfey
Mike Riscoe
Jose Garcia-Bustos
Acknowledgements