Imatinib Encyclopedia Information
Transcript of Imatinib Encyclopedia Information
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Imatinib 1
Imatinib
Imatinib
Systematic (IUPAC) name
4-[(4-methylpiperazin-1-yl)methyl]-N-(4-methyl-3-{[4-(pyridin-3-yl)pyrimidin-2-yl]amino}phenyl)benzamide
Clinical data
Trade names Gleevec, Glivec
AHFS/Drugs.com monograph[1]
MedlinePlus a606018[2]
Licence data
EMA:Link
[3]
, US FDA:link
[4]
Pregnancy cat. D (AU) D (US)
Legal status POM (UK) -only (US)
Routes Oral
Pharmacokinetic data
Bioavailability 98%
Protein binding 95%
Metabolism Hepatic (mainly CYP3A4-mediated)
Half-life 18 hours (imatinib)
40 hours (active metabolite)
Excretion Fecal (68%) and renal (13%)
Identifiers
CAS number 152459-95-5[5]
220127-57-1[6]
(mesilate)
ATC code L01XE01[7]
PubChem CID 5291[8]
DrugBank DB00619[9]
ChemSpider 5101[10]
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Imatinib 2
UNII BKJ8M8G5HI[11]
KEGG D08066[12]
ChEBI CHEBI:45783[13]
ChEMBL CHEMBL941[14]
Chemical data
Formula C29
H31
N7O
Mol. mass 493.603 g/mol
589.7 g/mol (mesilate)
(what is this?) (verify)[15]
Imatinib (Imatinib Mesylate), marketed by Novartis as Gleevec (USA) or Glivec (Europe/Australia/Latin America),
is a competitive tyrosine-kinase inhibitor used in the treatment of multiple cancers, most notably of which includes
Philadelphia Chromosome positive (Ph+
) Chronic Myelogenous Leukemia (CML).[16]
Like all tyrosine-kinaseinhibitors, Imatinib works by blocking a central tyrosine kinase enzyme, in this case, BCR-ABL from
phosphorylating subsequent proteins and initiating the signaling cascade necessary for cancer development. [17]
Because the BCR-ABL tyrosine kinase enzyme exists only in cancer cells and not in healthy cells, Imatinib is able to
function as a targeted cancer therapyonly cancer cells are killed through the drug's action.[18] In this regard,
Imatinib was one of the first cancer therapies to show the potential for such targeted action and of is often cited as a
paradigm for research in cancer therapeutics[19]
Due to the success of Imatinib, the developers of drug were awarded the Lasker Award in 2009 and the Japan Prize
in 2012.[20][21]
History
Imatinib was developed in the late 1990s by biochemist Nicholas Lydon, a former researcher for Novartis, and
oncologist Brian Druker of Oregon Health & Science University (OHSU). Other major contributions to imatinib
development were made by Carlo Gambacorti-Passerini, a physician scientist and hematologist at University of
Milano Bicocca, Italy, John Goldman at Hammersmith Hospital in London, UK, and later on by Charles Sawyers of
Memorial Sloan-Kettering Cancer Center.[22] Druker led the clinical trials confirming its efficacy in CML.[23]
Imatinib was developed by rational drug design. After the Philadelphia chromosome mutation and hyperactive
bcr-abl protein were discovered, the investigators screened chemical libraries to find a drug that would inhibit that
protein. With high-throughput screening, they identified 2-phenylaminopyrimidine. This lead compound was then
tested and modified by the introduction of methyl and benzamide groups to give it enhanced binding properties,resulting in imatinib.[24]
Gleevec received FDA approval in May 2001. On the same month it made the cover of TIME magazine as the
"magic bullet" to cure cancer. Druker, Lydon and Sawyers received the Lasker-DeBakey Clinical Medical Research
Award in 2009 for "converting a fatal cancer into a manageable chronic condition".[22]
Gleevec also holds the record for the drug with the fastest approval time by the FDA. According to Brian Druker,
one of the developers of Imatinib, the biggest obstacle to being approved was the name of the drug. At that time, the
drug was being called "Glivec", which is also the current spelling in most parts of the world. However, the United
States Food and Drug Administration did not want people to mispronounce "Glivec" as "GLIE-VEC" which could be
confused with a diabetic drug at the time. Therefore, Novartis, the pharmaceutical company who markets Gleevec,
changed the name of "Glivec" to include two "e's" and avoid the phonetic confusion: Gleevec. Shortly thereafter,
Gleevec was approved by the FDA.
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Uses
Clinical
Imatinib is used in chronic myelogenous leukemia (CML), gastrointestinal stromal tumors (GISTs) and a number of
other malignancies. One study demonstrated that imatinib mesylate was effective in patients with systemic
mastocytosis, including those who had the D816V mutation in c-Kit.[25]
Experience has shown, however, thatimatinib is much less effective in patients with this mutation, and patients with the mutation comprise nearly 90% of
cases of mastocytosis.
Chronic myelogenous leukemia
The U.S. Food and Drug Administration (FDA) has approved imatinib as first-line treatment for Philadelphia
chromosome (Ph)-positive CML, both in adults and children. The drug is approved in multiple Ph-positive cases
CML, including after stem cell transplant, in blast crisis, and newly diagnosed.[26]
Gastrointestinal stromal tumors
The FDA first granted approval for advanced GIST patients in 2002. On February 1st, 2012, imatinib was approvedfor use after the surgical removal of KIT-positive tumors to help prevent recurrence. [27] The drug is also approved in
unresectable KIT-positive GISTs.[26]
Other approvals
The FDA has approved imatinib for use in adult patients with relapsed or refractory Ph-positive ALL,
myelodysplastic/ myeloproliferative diseases associated with platelet-derived growth factor receptor gene
re-arrangements, aggressive systemic mastocytosis (ASM) without or an unknown D816V c-KIT mutation,
hypereosinophilic syndrome (HES) and/or chronic eosinophilic leukemia (CEL) who have the FIP1L1-PDGFR
fusion kinase (CHIC2 allele deletion) or FIP1L1-PDGFR fusion kinase negative or unknown, unresectable,
recurrent and/or metastatic dermatofibrosarcoma protuberans.[26]
Plexiform neurofibromas
For treatment of progressive plexiform neurofibromas associated with neurofibromatosis type I, early research has
shown potential for using the c-kit tyrosine kinase blocking properties of imatinib.[28][29][30][31][32]
Experimental
Imatinib may also have a role in the treatment of pulmonary hypertension. It has been shown to reduce both the
smooth muscle hypertrophy and hyperplasia of the pulmonary vasculature in a variety of disease processes,
including portopulmonary hypertension.[33] In systemic sclerosis, the drug has been tested for potential use in
slowing down pulmonary fibrosis. In laboratory settings, imatinib is being used as an experimental agent to suppress
platelet-derived growth factor (PDGF) by inhibiting its receptor (PDGF-R). One of its effects is delaying
atherosclerosis in mice without[34] or with diabetes.[35]
Mouse animal studies at Emory University in Atlanta have suggested that imatinib and related drugs may be useful
in treating smallpox, should an outbreak ever occur.[36]
In vitro studies identified that a modified version of imatinib can bind to gamma-secretase activating protein
(GSAP), which selectively increases the production and accumulation of neurotoxic beta-amyloid plaques. This
suggests molecules that target at GSAP and are able to cross bloodbrain barrier are potential therapeutic agents for
treating Alzheimer's disease.[37] Another study suggests that imatinib may not need to cross the bloodbrain barrier
to be effective at treating Alzheimer's, as the research indicates the production of beta-amyloid may begin in theliver. Tests on mice indicate that imatinib is effective at reducing beta-amyloid in the brain.[38] It is not known
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Imatinib 4
whether reduction of beta-amyloid is a feasible way of treating Alzheimer's, as an anti-beta-amyloid vaccine has
been shown to clear the brain of plaques without having any effect on Alzheimer symptoms.[39]
A formulation of imatinib with a cyclodextrin (Captisol) as a carrier to overcome the bloodbrain barrier is also
currently considered as an experimental drug for lowering and reversing opioid tolerance. Imatinib has shown
reversal of tolerance in rats.[40] Imatinib is an experimental drug in the treatment of desmoid tumor or aggressive
fibromatosis.
Adverse effects
bcr-abl kinase (green), which causes CML,
inhibited by imatinib (red; small molecule).
The most common side effects include: feeling sick (nausea),
diarrhoea, headaches, leg aches/cramps, fluid retention, visual
disturbances, itchy rash, lowered resistance to infection, bruising or
bleeding, loss of appetite;[41] weight gain, reduced number of blood
cells (neutropenia, thrombocytopenia, anemia), headache, and
edema.[42]
Severe congestive cardiac failure is an uncommon but recognized sideeffect of imatinib and mice treated with large doses of imatinib show
toxic damage to their myocardium.[43]
If imatinib is used in prepubescent children, it can delay normal
growth, although a proportion will experience catch-up growth during
puberty.[44]
Pharmacology
Pharmacokinetics
Imatinib is rapidly absorbed when given by mouth, and is highly bioavailable: 98% of an oral dose reaches the
bloodstream. Metabolism of imatinib occurs in the liver and is mediated by several isozymes of the cytochrome
P450 system, including CYP3A4 and, to a lesser extent, CYP1A2, CYP2D6, CYP2C9, and CYP2C19. The main
metabolite, N-demethylated piperazine derivative, is also active. The major route of elimination is in the bile and
feces; only a small portion of the drug is excreted in the urine. Most of imatinib is eliminated as metabolites, only
25% is eliminated unchanged. The half-lives of imatinib and its main metabolite are 18 and 40 hours, respectively. It
blocks the activity of Abelson cytoplasmic tyrosine kinase (ABL), c-Kit and the platelet-derived growth factor
receptor (PDGFR). As an inhibitor of PDGFR, imatinib mesylate appears to have utility in the treatment of a variety
of dermatological diseases. Imatinib has been reported to be an effective treatment for FIP1L1-PDGFRalpha+ mast
cell disease, hypereosinophilic syndrome, and dermatofibrosarcoma protuberans.[45]
Mechanism of action
Imatinib is a 2-phenylaminopyrimidine derivative that functions as a
specific inhibitor of a number of tyrosine kinase enzymes. It occupies
the TKactive site, leading to a decrease in activity.
There are a large number of TK enzymes in the body, including the
insulin receptor. Imatinib is specific for the TK domain in abl (the
Abelson proto-oncogene), c-kit and PDGF-R (platelet-derived growth
factor receptor).
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In chronic myelogenous leukemia, the Philadelphia chromosome leads to a fusion protein ofabl with bcr(breakpoint
cluster region), termed bcr-abl. As this is now a constitutively active tyrosine kinase, imatinib is used to decrease
bcr-abl activity.
The active sites of tyrosine kinases each have a binding site for ATP. The enzymatic activity catalyzed by a tyrosine
kinase is the transfer of the terminal phosphate from ATP to tyrosine residues on its substrates, a process known as
protein tyrosine phosphorylation. Imatinib works by binding close to the ATP binding site of bcr-abl, locking it in aclosed or self-inhibited conformation, and therefore inhibiting the enzyme activity of the protein
semi-competitively.[46] This fact explains why many BCR-ABL mutations can cause resistance to imatinib by
shifting its equilibrium toward the open or active conformation.[47]
Imatinib is quite selective for bcr-ablit does also inhibit other targets mentioned above (c-kit and PDGF-R), but no
other known tyrosine kinases. Imatinib also inhibits the abl protein of non-cancer cells but cells normally have
additional redundant tyrosine kinases which allow them to continue to function even if abl tyrosine kinase is
inhibited. Some tumor cells, however, have a dependence on bcr-abl.[48] Inhibition of the bcr-abl tyrosine kinase
also stimulates its entry in to the nucleus, where it is unable to perform any of its normal anti-apoptopic functions. [49]
The Bcr-Abl pathway has many downstream pathways including the Ras/MapK pathway, which leads to increased
proliferation due to increased growth factor-independent cell growth. It also affects the Src/Pax/Fak/Rac pathway.
This affects the cytoskeleton, which leads to increased cell motility and decreased adhesion. The
PI/PI3K/AKT/BCL-2 pathway is also affected. BCL-2 is responsible for keeping the mitochondria stable; this
suppresses cell death by apoptosis and increases survival. The last pathway that Bcr-Abl affects is the JAK/STAT
pathway, which is responsible for proliferation.[50]
Interactions
Since imatinib is mainly metabolised via the liver enzyme CYP3A4, substances influencing the activity of this
enzyme change the plasma concentration of the drug. An example of a drug that increases imatinib activity and
therefore side effects by blocking CYP3A4 is ketoconazole. The same could be true of itraconazole, clarithromycin,grapefruit juice, among others. Conversely, CYP3A4 inductors like rifampicin and St. John's Wort reduce the drug's
activity, risking therapy failure. Imatinib also acts as an inhibitor of CYP3A4, 2C9 and 2D6, increasing the plasma
concentrations of a number of other drugs like simvastatin, ciclosporin, pimozide, warfarin, metoprolol, and possibly
paracetamol. The drug also reduces plasma levels of levothyroxin via an unknown mechanism.[42]
As with other immunosuppressants, application of live vaccines is contraindicated because the microorganisms in the
vaccine could multiply and infect the patient. Inactivated and toxoid vaccines do not hold this risk, but may not be
effective under imatinib therapy.[51]
Costs
A box of 400-milligram Glivec tablets, as sold in
Germany
The cost of Gleevec for CML has ranged from $32,000[52][53] to
$98,000[54] a year, and for GIST is $64,800 a year.[55]
Prices for a 100 mg pill of Gleevec internationally range from $20 to
$30,[56] although generic imatinib is cheaper.[57]
Legal challenge to generics
In 2007, imatinib became a test case through which Novartis
challenged India's patent laws. A win for Novartis would make it
http://en.wikipedia.org/w/index.php?title=Indiahttp://en.wikipedia.org/w/index.php?title=Test_casehttp://en.wikipedia.org/w/index.php?title=File%3AGlivec_400mg.jpghttp://en.wikipedia.org/w/index.php?title=Toxoidhttp://en.wikipedia.org/w/index.php?title=Inactivated_vaccinehttp://en.wikipedia.org/w/index.php?title=Live_vaccinehttp://en.wikipedia.org/w/index.php?title=Levothyroxinhttp://en.wikipedia.org/w/index.php?title=Paracetamolhttp://en.wikipedia.org/w/index.php?title=Metoprololhttp://en.wikipedia.org/w/index.php?title=Warfarinhttp://en.wikipedia.org/w/index.php?title=Pimozidehttp://en.wikipedia.org/w/index.php?title=Ciclosporinhttp://en.wikipedia.org/w/index.php?title=Simvastatinhttp://en.wikipedia.org/w/index.php?title=St._John%27s_Worthttp://en.wikipedia.org/w/index.php?title=Rifampicinhttp://en.wikipedia.org/w/index.php?title=Grapefruit_juicehttp://en.wikipedia.org/w/index.php?title=Clarithromycinhttp://en.wikipedia.org/w/index.php?title=Itraconazolehttp://en.wikipedia.org/w/index.php?title=Ketoconazolehttp://en.wikipedia.org/w/index.php?title=Apoptosishttp://en.wikipedia.org/w/index.php?title=Cancer_cellhttp://en.wikipedia.org/w/index.php?title=Tyrosine_kinasehttp://en.wikipedia.org/w/index.php?title=Enzyme_inhibitorhttp://en.wikipedia.org/w/index.php?title=Phosphorylationhttp://en.wikipedia.org/w/index.php?title=Substrate_%28biochemistry%29http://en.wikipedia.org/w/index.php?title=Tyrosinehttp://en.wikipedia.org/w/index.php?title=Phosphatehttp://en.wikipedia.org/w/index.php?title=Catalysishttp://en.wikipedia.org/w/index.php?title=Adenosine_triphosphatehttp://en.wikipedia.org/w/index.php?title=Binding_sitehttp://en.wikipedia.org/w/index.php?title=Active_sitehttp://en.wikipedia.org/w/index.php?title=Tyrosine_kinasehttp://en.wiktionary.org/wiki/constitutivehttp://en.wikipedia.org/w/index.php?title=Philadelphia_chromosomehttp://en.wikipedia.org/w/index.php?title=Chronic_myelogenous_leukemia -
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harder for Indian companies to produce generic versions of drugs still manufactured under patent elsewhere in the
world. Doctors Without Borders argues a change in law would make it impossible for Indian companies to produce
cheap generic antiretrovirals (anti-HIV medication), thus making it impossible for Third World countries to buy
these essential medicines.[58] On 6 August 2007, the Madras High Court dismissed the writ petition filed by Novartis
challenging the constitutionality of Section 3(d) of Indian Patent Act, and deferred to the World Trade Organization
(WTO) forum to resolve the TRIPS compliance question. As of 2009 India has refused to grant patent exclusivity. .
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External links
NCI Drug Information Summary for Patients (http://www.cancer.gov/cancertopics/druginfo/
imatinibmesylate)
Imatinib bound to proteins (http://www.ebi.ac.uk/pdbe-srv/PDBeXplore/ligand/?ligand=STI) in the PDB
http://en.wikipedia.org/w/index.php?title=Protein_Data_Bankhttp://www.ebi.ac.uk/pdbe-srv/PDBeXplore/ligand/?ligand=STIhttp://www.cancer.gov/cancertopics/druginfo/imatinibmesylatehttp://www.cancer.gov/cancertopics/druginfo/imatinibmesylate -
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Chemgirl131, Chris Howard, Chris the speller, Cortamears, Daevatgl, Diberri, Dogcow, Doseiai2, Edgar181, Eleassar, Eloquence, Enkephalin, Eric Kvaalen, Erxnmedia, Fusion114, Fusion57,
Fuzbaby, Fvasconcellos, Gak, Gigemag76, Gleevec, Gubernator, Gyrofrog, Gzornenplatz, Harijay, Hazard-SJ, HazyM, Hinemash6, Holeung, Hoverflysmiles, IEEE, JWSchmidt, JeremyA,
Jfdwolff, Joherz, Julesd, Jyril, Katnap01, Kjc2002, Ksheka, Lian053, Linberry, Little green rosetta, Louisajb, Lupin, Martin451, MattKingston, Melaen, Michelle stone1, Nagelfar, Nbauman,
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Rod57, Rosalien, Rt34rt34, Rytyho usa, SDC, Sakurambo, SanderB, Selket, Silvaneus, Simplepink, Slambo, Smithbrenon, Snapperman2, Sodium, Spiff666, Stillwaterising, Tavilis, Techelf,TestPilot, TimVickers, TranMH, TylerDurden8823, Vogon77, Wyvern t, Yathirajancrystal, , 136 anonymous edits
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