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WO2002000164A2 - Chemosensitizer - Google Patents

Chemosensitizer Download PDF

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Publication number
WO2002000164A2
WO2002000164A2 PCT/IB2001/001133 IB0101133W WO0200164A2 WO 2002000164 A2 WO2002000164 A2 WO 2002000164A2 IB 0101133 W IB0101133 W IB 0101133W WO 0200164 A2 WO0200164 A2 WO 0200164A2
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WIPO (PCT)
Prior art keywords
resistance
chemotherapeutic agents
chemosensitizer
piperine
drug
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Application number
PCT/IB2001/001133
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French (fr)
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WO2002000164A3 (en
WO2002000164A8 (en
Original Assignee
Khamar, Bakulesh, Mafatlal
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Filing date
Publication date
Application filed by Khamar, Bakulesh, Mafatlal filed Critical Khamar, Bakulesh, Mafatlal
Priority to EA200200288A priority Critical patent/EA005672B1/en
Priority to EP01940915A priority patent/EP1296682A4/en
Priority to APAP/P/2002/002453A priority patent/AP2002002453A0/en
Priority to AU74403/01A priority patent/AU7440301A/en
Publication of WO2002000164A2 publication Critical patent/WO2002000164A2/en
Publication of WO2002000164A8 publication Critical patent/WO2002000164A8/en
Publication of WO2002000164A3 publication Critical patent/WO2002000164A3/en

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00Medicinal preparations containing organic active ingredients
    • A61K31/33Heterocyclic compounds
    • A61K31/395Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/435Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
    • A61K31/44Non condensed pyridines; Hydrogenated derivatives thereof
    • A61K31/445Non condensed piperidines, e.g. piperocaine
    • A61K31/4523Non condensed piperidines, e.g. piperocaine containing further heterocyclic ring systems
    • A61K31/4525Non condensed piperidines, e.g. piperocaine containing further heterocyclic ring systems containing a five-membered ring with oxygen as a ring hetero atom
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/30Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change

Definitions

  • the objective of the present invention is to provide a chemosensitizer for therapeutic use.
  • the further objective of the present invention is to provide a chemosensitizer, the dose of which, as chemosensitizer is achievable.
  • Chemotherapeutic agents are used to treat infections caused by bacteria, virus, protozoa, parasites, etc. They are also used in management of various malignant diseases (cancer). The major problem associated with use of chemotherapeutic agents is resistance to chemotherapeutic agents.
  • Mechanisms underlying resistance to chemotherapeutic agents include inactivation/modification of antibiotic (beta-lactams, chloramphenicol), insensitive target site (beta-lactams, glycopeptides, macrolides, tetracyclines), decreased drug accumulation in the form of enhanced efflux (tetracyclines, chloroquine, macrolides, anticancer drugs), by-pass of antibiotic sensitive step (methicillin, sulphonamides) etc.
  • the common mechanisms underlying drug resistance is to restrict concentration of drug at the site of action usually intracellular. This can be in the from of restricting the entry of the drug into the cell by various mechanisms including altered cell wall permeability. It can also be in the form of removing the drug from site of action e.g.
  • intracellular so that therapeutic concentration are not achieved. This is largely done by throwing out intracellular drug at a rate faster than usual so that balance of drug concentration is disturbed resulting into lower intracellular concentration. This is done through the mechanism which is known as efflux pump.
  • the other mechanism of decreasing therapeutic concentration of a drug include metabolism/alteration of drug to inactive compound e.g. secretion of enzymes like penicillinase or B-lactamase which destroys penicillins or B-lactam antibiotics.
  • chemotherapeutic agents e.g. penicillin's resistant penicillin like Cloxacillin, dicloxacillin, methicillin, flucloxacillin etc. or beta-lactamase resistance antibiotics like temocillin in a group o penicillin or advanced cephalosporins, monobactams etc.
  • chemotherapeutic agents e.g. beta-lactamase inhibitors like clavulanic acid, salbactam, tazobactam to be- used along with antibiotics like amipicillin, amoxycillin, ticarcillin etc.
  • chemosensitizers For example, calcium channel blocker, verpamil has been used to reverse chloroquine resistance in Plasmodium falciparum.
  • modified tetracyclines has been used as chemosensitizers to overcome efflux mediated drug resistance.
  • chemotherapeutic agents for restoring sensitivity to chemotherapeutic agents are broadly known as chemosensitizers (Table 2).
  • Many drugs used for various therapeutic effect are found to be good for this purpose e.g. Verapamil, Reserpine, Cyclosporin.
  • chemotherapeutic agents like rifampicin can work as a chemotherapeutic agent as well as chemosensitizer. Table 1:
  • Nikadio H Antibiotic resistance caused by gram negative multi-drug pump efflux pumps.
  • Roberts MC Tetracycline resistance determinants: mechanisms of action, regulation of expression, genetic mobility and distribution.
  • Tetracyclines antibiotic action, uptake and resistance mechanisms. Arch Microbiol 1996; 165(6): 359-69.
  • Papadopoulou MV et al. NLCQ-1 a novel hypoxic cytotoxin: potentiation of melphalan, cisDDPO and cyclophosphamide in vivo.
  • Schmitz FJ et al. The effect of reserpine, an inhibitor of multidrug efflux pumps, on the invitro activities of ciprofloxacin, sparfloxacin and moxifloxacin against clinical isolates of Staphylococcus aureus.
  • the present invention provides a chemosensitizer for therapeutic use, the dose of which as chemosensitizer is achievable.
  • the chemosensitizer as per the present invention belongs to R-1-3 benzodiaxoles.
  • Piperine is a compound belonging to R-1-3 benozodiaxoles. Strains of M. tuberculosis growing in presence of 40 mcg/ml of rifampicin are inhibited at various concentrations of piperine, the concentration of which is not more than 5 mcg/ml. Similarly in case of chloroquine-resistant P. falciparum strains, amount of piperine is dependent on level of resistance and amount of chloroquine.
  • the amount of chemosensitizer required is dependent on the compound, chemotherapeutic agent and level of resistance.
  • Rifampicin is a chemotherapeutic agent useful in the management of tuberculosis. Resistance to rifampicin is a major health problem.
  • Piperine is a compound belonging to a class of compound which can be grouped as R-1-3 benzodiaxole, where in, R is
  • Chloroquine is used in the management of malaria.
  • Plasmodium falciparum has acquired resistance to chloroquine. This is the major cause of morbidity and mortality caused by malaria.
  • the table below shows how piperine at different concentrations overcomes P. falciparum resistance to chloroquine.
  • the figures in each cell shows % inhibition of P. falciparum. It clearly shows that % inhibition for a resistant strain of P.falciparum can be improved by addition of piperine. Inhibition can be increased by increasing the dose of either compound.
  • the amount of piperine required is dependent on level of resistance and amount of chemotherapeutic agent.
  • Piperine was evaluated for its bioavailability and toxicity in animals.
  • R-1-3 benzodioxole compounds useful as chemosensitizers are provided. These compounds can be useful in therapy as it is possible to achieve therapeutic levels in plasma.

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  • Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Medicinal Chemistry (AREA)
  • Pharmacology & Pharmacy (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)

Abstract

Chemotherapeutic agents are used to treat infections caused by bacteria, virus, protozoa, parasites, and various malignant diseases like cancer. The major problem associated with use of chemotherapeutic agents is resistance to chemoptherapeutic agents. The drugs restoring sensitivity of chemotherapeutic agents are broadly known as chemosensitizers. Compounds belonging to a group of R-1-3-benzodiaxole are found to be chemosensitizer as per the present invention. Piperine is one such compound belonging to R-1-2benzodiaxole group. It is found to reverse resistance to chemotherapeutic agents like rifampicin at a dose which is easily achievable after oral ingestion of the drug.

Description

THE PATENTS ACT, 1970 THE COMPLETE SPECIFICATION
1. CHEMOSENSITIZER.
2. Dr. Bakuiesh Mafatial Khamar, residing at 201 "Ashadha", Vasundhara Colony, Gulbai Tekra, Ellisbridge, Ahmedabad 380 006, Gujarat, India, Nationality: Indian
3. The following specification particularly describes the nature, of this invention and the manner in which it is to be performed.
FIELD OF INVENTION
The objective of the present invention is to provide a chemosensitizer for therapeutic use.
The further objective of the present invention is to provide a chemosensitizer, the dose of which, as chemosensitizer is achievable.
BACKGROUND OF THE INVENTION
Chemotherapeutic agents are used to treat infections caused by bacteria, virus, protozoa, parasites, etc. They are also used in management of various malignant diseases (cancer). The major problem associated with use of chemotherapeutic agents is resistance to chemotherapeutic agents.
Mechanisms underlying resistance to chemotherapeutic agents include inactivation/modification of antibiotic (beta-lactams, chloramphenicol), insensitive target site (beta-lactams, glycopeptides, macrolides, tetracyclines), decreased drug accumulation in the form of enhanced efflux (tetracyclines, chloroquine, macrolides, anticancer drugs), by-pass of antibiotic sensitive step (methicillin, sulphonamides) etc. The common mechanisms underlying drug resistance is to restrict concentration of drug at the site of action usually intracellular. This can be in the from of restricting the entry of the drug into the cell by various mechanisms including altered cell wall permeability. It can also be in the form of removing the drug from site of action e.g. intracellular so that therapeutic concentration are not achieved. This is largely done by throwing out intracellular drug at a rate faster than usual so that balance of drug concentration is disturbed resulting into lower intracellular concentration. This is done through the mechanism which is known as efflux pump. The other mechanism of decreasing therapeutic concentration of a drug include metabolism/alteration of drug to inactive compound e.g. secretion of enzymes like penicillinase or B-lactamase which destroys penicillins or B-lactam antibiotics.
Attempts have been made and efforts are on to counteract this acquired drug resistance. One way is to improve chemotherapeutic agents e.g. penicillin's resistant penicillin like Cloxacillin, dicloxacillin, methicillin, flucloxacillin etc. or beta-lactamase resistance antibiotics like temocillin in a group o penicillin or advanced cephalosporins, monobactams etc.
The other way is to find out drugs to overcome resistance for use along with chemotherapeutic agents e.g. beta-lactamase inhibitors like clavulanic acid, salbactam, tazobactam to be- used along with antibiotics like amipicillin, amoxycillin, ticarcillin etc.
However, this approach has been successful in situations wherein beta- lactamase enzyme has been the problem.
The present situation is faced with new mechanism of resistance, like enhancement of efflux responsible for multi-drug resistance. This was initially seen with tetracycliηe antibiotics, but now is extended to many antibiotics like ciprofloxacin, norfloxacin, chloroquine and also has extended to many anticancer therapies (shown in the list below) which is now the major mechanism of resistance.
To overcome this efflux, attempts have been made by use of compounds called chemosensitizers. For example, calcium channel blocker, verpamil has been used to reverse chloroquine resistance in Plasmodium falciparum.
Likewise, modified tetracyclines has been used as chemosensitizers to overcome efflux mediated drug resistance.
In case of anticancer therapies, several compounds have been identified that enhanced drug's accumulation inside the cell like verapamil, amiodarone, steroids, cyclosporins, phenothiazines and other compounds as shown in the list below.
The drugs to be used along with chemotherapeutic agents (Table 1 ) for restoring sensitivity to chemotherapeutic agents are broadly known as chemosensitizers (Table 2). Many drugs used for various therapeutic effect are found to be good for this purpose e.g. Verapamil, Reserpine, Cyclosporin.
Some of the chemotherapeutic agents like rifampicin can work as a chemotherapeutic agent as well as chemosensitizer. Table 1:
Figure imgf000006_0001
However, the main problem associated with their use is higher therapeutic dose. It is not possible to administer known chemosensitizers in an amount necessary to obtain therapeutic levels required for chemosensitizing effect. Because of these they have not found wide spread applications. The search is going on to find out newer drugs for these purposes which can be .used safely in therapeutic dose.
REFERENCES:
1. Chiba P et al. Substituted 4- acylpyrazoles and 4-acylpyrazolones: synthesis and multidrug resistance modulating activity.
J Med Chem 1998; 41 : 4001-4011.
2. Norman BH. Inhibitors of MRP__1 mediated multi-drug resistance. Drugs of the Future 1998; 23(9): 1001 -13.
3. Nikadio H. Antibiotic resistance caused by gram negative multi-drug pump efflux pumps.
Clin Infect Dis 1998; 27 Suppl 1 : S32-41.
4. Pechere JC et al. Antibiotic efflux, a mechanism of multiple resistance in Pseudomonas aeruginosa.
Bull Acad Natl Med 1998; 182(3): 599-612.
5. Roberts MC. Tetracycline resistance determinants: mechanisms of action, regulation of expression, genetic mobility and distribution.
FEMS Microbiol Rev 1996; 19(1): 1-24.
6. Schnappinger D and Hillen W.
Tetracyclines: antibiotic action, uptake and resistance mechanisms. Arch Microbiol 1996; 165(6): 359-69.
7. Sum PE et al. Recent developments in tetracycline antibiotics. Curr Pharm Des 1998; 4(2): 119-32.
8. Nikaido H. Multiple antibiotic resistance and efflux. Curr Opin Microbiol 1998; 1 (5): 516-23. 9. Piddock LJ et al. Accumulation of rifampicin my Mycobacterium aurum, Mycobacterium smegmatis and Mycobacterium tuberculosis.
J Antimicrob Chemother 2000; 45(2): 159-65.
10. Aeschlimann JR et al. The effects of NorA inhibition on the activities of levofloxacin, ciprofloxacin, and norfloxacin against two genetically related strains of Staphylococcus aureus in an in vitro infection model.
J Antimicrob Chemother 1999; 44(3): 343-9.
11. Choudhuri BS et al. Isoniazid accumulation in Mycobacterium smegmatis id mediated by proton motive force driven and ATP dependent extrusion systems.
Biochem Biophys Res Commun 1999; 256(3): 682-4.
12. De Flora S et al. Modulation of the potency of promutagens and direct acting mutagens in bacteria by inhibitors of the multidrug resistance mechanism.
Mutagenesis 1997; 12(6): 431-5.
13. Theis JG et al. Assessment of systemic toxicity in children receiving chemotherapy with cyclosporihe for sarcoma.
Med Paediatr Oncol 2000; 34(4): 242-9.
14. Hafkemeyer P et al. Chemoprotection of haematopoietic cells by a mutant P-glycoprotein resistant to a potent chemosensitizer of multi-drug resistant cancers.
Hum Gene Ther 2000; 11 (4): 555-65.
15. Rafatro H et al. Reversal activity of the naturally occurring chemosensitizer malagashanine in Plasmodium malaria.
Biochem Pharmacol 2000; 59(9): 1053-61.
16. Yanagisawa T et al. Biricodar (VX-710): an effective chemosensitizer in neuroblastoma.
Br J Cancer 1999; 80(8): 1190-6.
17. Papadopoulou MV et al. NLCQ-1 , a novel hypoxic cytotoxin: potentiation of melphalan, cisDDPO and cyclophosphamide in vivo.
Int J Radiat Oncol Biol Phys 1998; 42(4): 775-9. 18. Sharom FJ. The P-Glycoprotein efflux pump: How does it transports drugs?
J Memb Biol 1997; 160(3): 161-75. )
19. Schmitz FJ et al. The effect of reserpine, an inhibitor of multidrug efflux pumps, on the invitro activities of ciprofloxacin, sparfloxacin and moxifloxacin against clinical isolates of Staphylococcus aureus.
J Antimicrob Chemother 1998; 42(6): 807-10.
20. Markham PN. Inhibition of the emergence of ciprofloxacin resistance in Streptococcus pneumoniae by the multidrug efflux inhibitor reserpine. Antimicrob Ag Chemother 1999; 43(4): 988-9.
21. Nakanishi N et al. Mechanisms of clinical resistance to fluoroquinόlones in Staphylococcus aureus.
Antimicrob Ag Chemother 1991 ; 35(12): 2562-7.
22. Nelson ML. Inhibition of Tetracycline efflux antiport protein by 13-Thio- Substitute, 5-hydroxy-6-deoxytetracyclines.
J Med Chem 1993; 36: 37-7.
23. Courtois A et al. Inhibition of multi-drug resistance-associated protein (MRP) activity by rifampicin in human multi-drug resistant lung tumor cells. Cancer Lett 1999; 139(1 ): 97-104.
24. Piddock LJ et al. Accumulation of rifampicin my Mycobacterium aurum, Mycobacterium smegmatis and Mycobacterium tuberculosis. Antimicrob Ag Chemother 2000; 45(2): 159-65.
SUMMARY OF THE INVENTION
The present invention provides a chemosensitizer for therapeutic use, the dose of which as chemosensitizer is achievable. The chemosensitizer as per the present invention belongs to R-1-3 benzodiaxoles.
Piperine is a compound belonging to R-1-3 benozodiaxoles. Strains of M. tuberculosis growing in presence of 40 mcg/ml of rifampicin are inhibited at various concentrations of piperine, the concentration of which is not more than 5 mcg/ml. Similarly in case of chloroquine-resistant P. falciparum strains, amount of piperine is dependent on level of resistance and amount of chloroquine.
DESCRIPTION OF THE INVENTION
According to the present invention it is observed that R-1-3 Benzodioxole compounds with structural formula
Figure imgf000010_0001
are chemosensitizers.
The amount of chemosensitizer required is dependent on the compound, chemotherapeutic agent and level of resistance.
The following examples provide proof of such compounds working as chemosensitizer.
EXAMPLE 1
Rifampicin is a chemotherapeutic agent useful in the management of tuberculosis. Resistance to rifampicin is a major health problem.
A strain of mycobacterium is considered resistant if it grows in presence of rifampicin 40 mcg/ml. Piperine is a compound belonging to a class of compound which can be grouped as R-1-3 benzodiaxole, where in, R is
Figure imgf000011_0001
Piperine with structural formula
Figure imgf000011_0002
is found to reverse resistance to rifampicin. The amount of piperine required for this action does not have any effect on Mycobacterium tuberculosis.
The table below gives results of such study against nine different such strains. It is clear that all strains growing in vitro in presence of 40 mcg/ml of rifampicin are inhibited at various concentration of piperine. The concentration of piperine required for this purpose is not more than 5 mcg/ml.
Figure imgf000011_0003
EXAMPLE 2:
Chloroquine is used in the management of malaria. One of the organism, Plasmodium falciparum has acquired resistance to chloroquine. This is the major cause of morbidity and mortality caused by malaria.
The table below shows how piperine at different concentrations overcomes P. falciparum resistance to chloroquine. The figures in each cell shows % inhibition of P. falciparum. It clearly shows that % inhibition for a resistant strain of P.falciparum can be improved by addition of piperine. Inhibition can be increased by increasing the dose of either compound.
Figure imgf000012_0001
The amount of piperine required is dependent on level of resistance and amount of chemotherapeutic agent.
Piperine was evaluated for its bioavailability and toxicity in animals.
The results of the pharmacokinetic study in rat (Figure 1) shows that compound is absorbed from intestinal tract when given orally. It also indicates that compound has a long half-life. The toxicological study also reveals that piperine is non toxic.
Pharmacokinetic study in humans (table below and Figure 2) also reveal that piperine is absorbed from gastrointestinal tract, and adequate therapeutic concentration can be achieved.
Figure imgf000013_0001
Thus, according to the present invention is provided R-1-3 benzodioxole compounds useful as chemosensitizers. These compounds can be useful in therapy as it is possible to achieve therapeutic levels in plasma.

Claims

I claim:
1. R-1 -3 Benzodioxoles as a chemosensitizer with a structural formula
2. A chemosensitizer as c <la;imxed in claim 1 can be piperine wherein R is
y Piperine
3. A chemosensitizer as claimed in claim' 1 to 2 "is useful in overcoming resistance of chemotherapeutic agents.
4. Chemotherapeutic agent as claimed in claim 3 can be rifampicin.
5. Chemotherapeutic agents as claimed in claim 3 can be antimetabolites.
6. Antimetabolites as claimed in claim 5 can be selected from group comprising Doxorubicin, Dounorubicin, Vincristine, Vinblastine, Paclitaxel, Carboplatin, Etoposide, Taxotrene, Topotecan, Adriamycin, Cisplatin, 5-Fluorouracil, Mitoxantrone, Bleomycin and. the like.
7. Chemotherapeutic agent as claimed in claim 3 can be chloroquine.
PCT/IB2001/001133 2000-06-26 2001-06-26 Chemosensitizer WO2002000164A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EA200200288A EA005672B1 (en) 2000-06-28 2001-06-26 Chemosensitizer
EP01940915A EP1296682A4 (en) 2000-06-28 2001-06-26 Chemosensitizer
APAP/P/2002/002453A AP2002002453A0 (en) 2000-06-28 2001-06-26 Chemosensitizer
AU74403/01A AU7440301A (en) 2000-06-26 2001-06-26 Chemosensitizer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN591/MUM/2000 2000-06-26
IN591MU2000 2000-06-28

Publications (3)

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WO2002000164A2 true WO2002000164A2 (en) 2002-01-03
WO2002000164A8 WO2002000164A8 (en) 2002-05-16
WO2002000164A3 WO2002000164A3 (en) 2002-10-24

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EP (1) EP1296682A4 (en)
AP (1) AP2002002453A0 (en)
AU (1) AU7440301A (en)
EA (1) EA005672B1 (en)
RU (1) RU2002107449A (en)
WO (1) WO2002000164A2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006514972A (en) * 2003-03-31 2006-05-18 カウンシル オブ サイエンティフィク アンド インダストリアル リサーチ Use of cumin extract and piperine to influence the biological effectiveness of anti-infectives
WO2006103527A1 (en) * 2005-03-31 2006-10-05 Council Of Scientific And Industrial Research Aromatic substituted pentadienoic acid amide for combination with anti-infective drugs
EP2468868A1 (en) 2006-06-26 2012-06-27 The University Of British Columbia Chemotherapeutic sensitizers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5439891A (en) * 1993-10-29 1995-08-08 Kapil; Randhir S. Process for preparation of pharmaceutical composition with enhanced activity for treatment of tuberculosis and leprosy
IN176897B (en) * 1993-10-29 1996-09-28 Cadila Lab Ltd
US5744161A (en) * 1995-02-24 1998-04-28 Sabinsa Corporation Use of piperine as a bioavailability enhancer
EP0935964A1 (en) * 1998-02-12 1999-08-18 Panacea Biotec Limited Pharmaceutical compositions containing NSAIDs and piperine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE CAPLUS [Online] SHENOY ET AL.: 'Characterization of potentially mutagenic products from the nitrosation of perperin', XP002908374 Retrieved from STN Database accession no. 117:212755 & CANCER LETTERS vol. 64, no. 3, 1992, pages 235 - 239 *
See also references of EP1296682A2 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006514972A (en) * 2003-03-31 2006-05-18 カウンシル オブ サイエンティフィク アンド インダストリアル リサーチ Use of cumin extract and piperine to influence the biological effectiveness of anti-infectives
WO2006103527A1 (en) * 2005-03-31 2006-10-05 Council Of Scientific And Industrial Research Aromatic substituted pentadienoic acid amide for combination with anti-infective drugs
EP2468868A1 (en) 2006-06-26 2012-06-27 The University Of British Columbia Chemotherapeutic sensitizers
US8440625B2 (en) 2006-06-26 2013-05-14 University Of British Columbia Secreted protein acidic and rich in cysteine (SPARC) as chemotherapeutic sensitizers

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EA200200288A1 (en) 2003-02-27
AP2002002453A0 (en) 2002-06-30
EP1296682A4 (en) 2004-11-10
RU2002107449A (en) 2003-11-20
AU7440301A (en) 2002-01-08
WO2002000164A3 (en) 2002-10-24
EA005672B1 (en) 2005-04-28
EP1296682A2 (en) 2003-04-02
WO2002000164A8 (en) 2002-05-16

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