천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 from natural product to clinical...
TRANSCRIPT
![Page 1: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/1.jpg)
천 연 물 약 품 화 학 연 구 실
석 사 1 기 장 성 완
From Natural Product to Clinical Trials:
Bevirimat, a Plant-Derived Anti-AIDS Drug
![Page 2: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/2.jpg)
Index0. AIDS
1. Introduction2. Bioactivity-directed Fractionation and Isolation3. Lead Identification4. Lead Optimisation and SAR Study 4.1 Modification of the BA Triterpene Skeletion 4.2 Modification on C-3 Position of BA 4.3 Introduction of C-28 Side Chain into BA 4.4 Bifunctional BA Analouges – Potential for Maturation Inhibitor Development
5. Mechanism of Action Studies of Bevirimat6. Preclinical Studies of Bevirimat7. Clinical Trials and Current Status of Bevirimat8. Conclusions
![Page 3: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/3.jpg)
0. AIDS
ⅰ. What is the AIDS
ⅱ. Classification of HIV
ⅲ. HIV Life Cycle
ⅳ. Current status ; Anti-HIV Drug
ⅴ. Domestic research trend
![Page 4: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/4.jpg)
ⅰ. What is the AIDSAIDS - Acquired Immune Deficiency Syndrome
the human
immune system
caused by infection
with human
immunodeficiency
virus (HIV).
![Page 5: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/5.jpg)
ⅱ. Classification of HIV
Species HIV-1 HIV-2
Virulence High Lower
Infectivity High Low
Prevalence Global West Africa
Inferred Origin
Common chimpanzee
Sooty Mangabey
HIV-1
Group : Group (ssRNA-RT)Ⅵ
Family : Retrociridae
Genus : Lentivirus
![Page 6: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/6.jpg)
ⅲ. HIV Life Cycle
1. Binding
2. Reverse Transcription
3. Integration
4. Transcription
5. Translation
6. Viral Assembly and
Maturation
1
2
3
4
5
6
![Page 7: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/7.jpg)
1. Binding
- HIV binding T4-cell’s CD4+ receptor
- CD4+ receptor be generated HIV binding
- This step can be blocked by entry
inhibitors
2. Reverse Transcription
- Making proviral DNA by RTase
- This step can be blocked by
NRTIs(Nucleoside Reverse
Transcripatase Inhibitors) and NNRTIs
(Non-Nucleoside Reverse Transcriptase
Inhibitors)
![Page 8: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/8.jpg)
3. Integration
- another viral enzyme called integrase
hides the proviral DNA into the cell's DNA
- This step can be blocked by intergrase
inhibitors
4. Transcription
- creating a complementary strand of
genetic material called messenger RNA
or mRNA
- This step can be blocked by antisense
antivirals or transcription inhibitors (TIs),
![Page 9: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/9.jpg)
5. Translation
- The mRNA carries instructions for making
new viral proteins from the nucleus
6. Viral Assembly and Maturation
-Final step virus infection
-Viral Assembly step can be blocked by
Protease Inhibitors (PIs)
-Maturation step can be blocked by
Maturation Inhibitors(Mis)
![Page 10: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/10.jpg)
ⅳ. Current status ; Anti-HIV Drug
![Page 11: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/11.jpg)
ⅳ. Current status ; Anti-HIV Drug
![Page 12: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/12.jpg)
ⅴ. Domestic research trend
Patent
- 태림제약 anti-virus drug
Raw matrial supply
- 유한양행 GWM 사와 계약
Technology Licensing
- 화학硏 - Gilead
![Page 13: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/13.jpg)
1. Introduction 29 approved drugs marketed to treat HIV-1 infection ex) Fuzeon [enfuvirtide,ENF,T-20] – inhibit viral entry
Selzentry[maraviroc,MVC] - CCR5 coreceptor antagonist
HAART(Highly active antiretroviral therapy) combination of drugs with different targets
HAART improved patient’s life quality and length
But HAART made drug-resistant virus
up to 78% if HIV-1-infected individuals harbour drug-resistance virus with a rapidly growing subgroup
Therefore, novel potent antiviral agents need
![Page 14: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/14.jpg)
2. Bioactivity-directed Fractionation and Isolation
QSAR(Qunatitative Structure-activity relationship)ADMET (absorption, distribution, metabolism, excretion, toxicity)
![Page 15: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/15.jpg)
3. Lead Identification
- Triterpene have diverse structure and pharmacological activities
- Several naturally occurring triterpenes have been reported to show anti-HIV activity
- Bevirimat, the first in a new class of compound termed HIV maturation inhibitor(Mis)
![Page 16: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/16.jpg)
- betulinic acid and platanic acid can inhibit HIV-1 BⅢ replication (EC50/bet 1.4 μM /
EC50/pla 6.5 μM)
- betulinic acid contains many plant species
( e.g Tryphyllum peltatum, Ancistrocladus heyneanus, Ziziphi fructus, Tetracera boloviana )- betulin can modify to betulinic acid (betulin in birch bark)
![Page 17: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/17.jpg)
4.Lead Optimisation and SAR Study4.1 Modification of the BA Triterpene Skeletion
- C–3 alcohol
This functional group
can be eliminated or
oxidised
- Betulinic acid have a readily chemical
modification site
C–3 alcohol
C–19 isopropenyl
C–28 carboxyl group - C–19 isopropenyl
This functional group
undergoes typical
reaction with allylic
group
- C–28 carboxyl group
This functional group
can be derivatised
providing ester and
amide
![Page 18: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/18.jpg)
- C–19 isopropenyl
reaction with Pd-C
(Catalytic hydrogenation)
EC50 0.9μM / TI value 14
- C–3 alcohol Oxd
EC50 0.22μM
CC50 0.9μM (cytotoxic)
- C-2 Hydroxylation
EC50 42.3μM(weak
activity)
- C–28 carboxyl group
EC50 23μM / TI value
1.9
![Page 19: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/19.jpg)
4.2 Modification on C-3 Position of BA
- C-3 hydroxyl group readily
acylated with variety of anhydrides
and acid chlorides
1 2
Com 8, 9 ) Extremely potent anti-HIV
activity
Com 15, 16) similar potencties compare
com 8,9
Com 10, 17 ) reduction in antiviral
activity
Com 13, 20~22 ) lack or no antiviral
activity
Com 7, 11, 12, 14, 18 ) partial antiviral
activity
![Page 20: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/20.jpg)
- C-3 modification’s result indicates that the two C-3’ methyl group
in the bevirimat side chain contribute anti-HIV activity and terminal
carboxyl acid substitution has antiviral activity potent
![Page 21: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/21.jpg)
Similar activity
Moderate
activity
![Page 22: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/22.jpg)
- C-3 position of BA and betulin,
geminal dimethyl substitution of
the side chain C-3’ position
coupled with a terminal
carboxylic acid are important to
the enhanced antiviral activity for
both of these triterpene
templates
![Page 23: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/23.jpg)
C-3 stereo convertC-3 stereo
eliminate
Two compound anti-viral activity dramatically reduced, indicating the importance of the 3-C stereo
![Page 24: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/24.jpg)
R S
- C-3 oxygen exchange with
nitrogen
Only com 42, 45 weak antiviral
activity
- com 46 have similar activity compare buletin(com 4)
but have cytotoxic (EC50 0.22μM / CC50 0.9μM)
- Similary com 47 has antiviral activity and cytotoxic
(EC50 0.22μM / CC50 0.9μM)
- com 48~50 has similar antiviral activity but decrease
cytotoxic (EC50 0.57~4.57μM / CC50 > 15μM)
![Page 25: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/25.jpg)
4.3 Introduction of C-28 Side Chain into BA
- These type functions by blocking the viral entry into the host cells
- Increasing chain length influence the anti-HIV potency
- compound with amide side chains between aminooctanoic acid and aminododecanoic acid
tend to increase antiviral potency
- com 51 inhibits the infectivity of several HIV-1
strains (EC50 0.05~2μM)
- com 52 equipotent antiviral activity
![Page 26: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/26.jpg)
- com 53 have equipotent against
HIV-1 virus when compare with
com 51, com 52
- com 51 show potent antiviral activity
in vitro but its clinical development
was stopped due to poor
‘pharmacodynamic properties’
![Page 27: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/27.jpg)
4.4 Bifunctional BA Analouges – Potential for Maturation Inhibitor Development
- Two functionalities are on the opposite position of the BA skeleton
- a design combining both modifications led to the development of bi-functional BA
analogues
- EC50 0.0026μM higher potent than C-3 and C-28 parent compound
- This category preserves both the anti HIV-1 entry and maturation inhibit ability
![Page 28: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/28.jpg)
5. Mechanism of Action Studies of Bevirimat
- Bevirimat affect virus replication at a
time point after the completion of viral
DNA integration and Tat expression
- inhibited the processing of the viral
Gag polyprotein at a specific step
- Bevirimat does not affect viral RT,
reverse protease, virus particle budding
![Page 29: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/29.jpg)
- Bevirimat blocks processing of CA-
SP1(p25) to CA (p24) which
necessary for final capsid
condensation and formation of
infectious, bevirimat cause abnormal
morphology to virus
- consequently virus become non-
infectious
- Bevirimat has no effect on
processing at other site of Gag
![Page 30: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/30.jpg)
- Bevirimat-resistant isolates were selected by serial passage of HIV-1
- resistant virus found several point mutations proximal to the cleavage site of
CA-SP1
CA H226Y, L231M, L231F, SP1 A1V and A3V
- no mutation observed in other region of Gag or in the PR coding region
- Bevirimat does not affect SIV / HIV-2
Gag region relate virion
structural proteins protase
![Page 31: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/31.jpg)
6. Preclinical Studies of Bevirimat- EC50 10.3nM against subtype B virus
(similar activity compare with AZT,nevirapine)
-Bevirimat retains nanomolar inhibitory activity
against drug resistant HIV strains(NRTIs, NNRTIs,
PIs resistant)
- no activity against HIV-2, SIV and other similar
envelop virus type
Mouse type : SCID-hu Thy/Liv
Does : Twice daily / Oral
Virus : HIV-1 infected
Dose-dependent manner
>2log10 in HIV-1 RNA
≥ 90% p24 conc.
Gag-p24+ thymocytes at 100mg/kg per day
Observe in the mice at plasma conc.
![Page 32: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/32.jpg)
7. Clinical Trials and Current Status of Bevirimat
- Phase (In 2004 completed)Ⅰ
PanocosPharm dose single and multiple phase clinical trials of bevirimat in
healthy volunteers / Oral solution
It well tolreated half-life of ~ 2.5-3 days / supporting daily dosing regimen
- Phase a (In August 2005, completed)Ⅱ
random double-blind, bevirimat monotherapy for ten days resulted in statistically
significant reduction in viral load compare with placebo (individual decrease up to
1.7log10, 100 and 200mg dose)
No evidence develop drug resistant virus
![Page 33: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/33.jpg)
7. Clinical Trials and Current Status of Bevirimat
- Phase b (In 2008 completed)Ⅱ
patients failing HIV therapy due to drug resistance
Good activity in 369, 370, 371 on Gag amino acid sequence mutant, less activity
in polymorphism(variants)
20μg/mL bevirimat is required for a robust response
the mean viral load reduction was -1.18log10copies/mL after 14days in the patients
who free of key baseline Gag polymorphism and bevirimat conc. Minimum target
of 20μg/mL
91% of patients with these two response predictors han at least a 0.5log10 viral
load reduction by week 2 with a maximum treatment response of 2.03log10
![Page 34: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/34.jpg)
7. Clinical Trials and Current Status of Bevirimat
- Phase b (In 2008 completed)Ⅱ
bevirimat well tolerated, with a safety profile comparable to placebo through the
14days of treatment
Bevirimat tablet formulation dosed twice daily achieved target plasma levels
After 14 days of bevirimat treatment given twice daily at doses of 200mg or
300mg(using the 50 mg tablet)
32% patient (treatment naïve and experienced) had plasma concentrations
well above the previously identified minimum target of 20μg/mL
Phase are being plannedⅢ
![Page 35: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/35.jpg)
8. Conclusions
- HAART has led to a significant improvement in the health and life span
HIV-1-infected patients
- But, major problem is the increasing prevalence of virus strains
that are resistant to approved drug
- Plants are a major source of biologically active compounds and can provide
good leads that are structurally unique and/or have new mechanism of action
![Page 36: 천 연 물 약 품 화 학 연 구 실 석 사 1 기 장 성 완 From Natural Product to Clinical Trials: Bevirimat, a Plant-Derived Anti-AIDS Drug](https://reader035.vdocuments.mx/reader035/viewer/2022062300/56649da75503460f94a940ec/html5/thumbnails/36.jpg)
Thank You for Your Attention