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US20100221186A1 - Biomarkers for cardiovascular side-effects induced by cox-2 inhibitory compounds - Google Patents

Biomarkers for cardiovascular side-effects induced by cox-2 inhibitory compounds Download PDF

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US20100221186A1
US20100221186A1 US12/293,652 US29365206A US2010221186A1 US 20100221186 A1 US20100221186 A1 US 20100221186A1 US 29365206 A US29365206 A US 29365206A US 2010221186 A1 US2010221186 A1 US 2010221186A1
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cox
adverse effects
inhibitor
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Hueseyin Firat
Julie Boisclair
Olivier Grenet
Perentes Elias
Martin M. Schumacher
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    • A—HUMAN NECESSITIES
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    • C12Q2600/00—Oligonucleotides characterized by their use
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    • C—CHEMISTRY; METALLURGY
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    • C12Q2600/00—Oligonucleotides characterized by their use
    • C12Q2600/142—Toxicological screening, e.g. expression profiles which identify toxicity
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    • C12Q2600/00—Oligonucleotides characterized by their use
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    • G01N2800/00—Detection or diagnosis of diseases
    • G01N2800/32—Cardiovascular disorders
    • G01N2800/328—Vasculitis, i.e. inflammation of blood vessels

Definitions

  • the invention relates generally to the in vivo testing of the efficacy of a compound or composition, and particularly to the testing and biologically functionalizing of cox-2 inhibitory compounds (coxibs) by activity in vivo.
  • coxibs cox-2 inhibitory compounds
  • cox-2 specific inhibitory compounds coxibs
  • some NSAIDs have been associated with an increased risk of cardiovascular events in human including deep venous thrombosis, myocardial infarction, stroke, and sudden death.
  • the current hypothesis is that some of anti-inflammatory compounds inhibit PGI2 synthesis but not TxA synthesis, altering the homeostatic balance towards the pro-coagulative/pro-trombotic pathways.
  • Fitzgerald G A N Engl J Med. 351(17):1709-11 (Oct. 21, 2004).
  • some of anti-inflammatory compounds, mainly cox-2 inhibitors inhibit PGI2 synthesis only, resulting in altered homeostatic balance towards the pro-coagulative pathways which in rare cases might lead to the serious cardiovascular side effects in human.
  • Furberg C D, Psaty B M FitzGerald G A. Circulation. 111(3):249 (Jan. 25, 2005).
  • the specific genomic pattern includes gene expression changes involved in blood and endothelial cell (EC) activation, interaction of blood cells with EC, activation of INF ⁇ pathway, and release of pro-inflammatory cytokines and chemo-attractants.
  • EC endothelial cell
  • INF ⁇ pathway activation of INF ⁇ pathway
  • pro-inflammatory cytokines and chemo-attractants pro-inflammatory cytokines and chemo-attractants.
  • the overall genomic findings show that Cox-2/PGE2 inhibition results in strong and uncontrolled induction of INF ⁇ regulated chemo-attractants, adhesion molecules, and proinflammatory/pro-coagulative molecules which might lead to or increase the risk of cardiovascular adverse events. Histopathological results confirmed the genomic findings showing that the specific genomic pattern is an early signature of vasculitis and is observed only in the animal treated with Vioxx®.
  • the invention provides biomarkers (in the form of genomic information and serum or plasma proteins) for minimal and early vasculitis or other vasculopathies.
  • the invention provides biomarkers for predicting potential Vioxx®-induced cardiovascular adverse effects.
  • biomarkers advantageously allows safe use of cox-2 inhibitory compounds in clinics and selection of cox-2 inhibitory follow-up compounds without cardiovascular toxicity. Indeed, the expression of several genes increased in the vessels of the Vioxx®-treated animal encode for secreted proteins, e.g., chemokine (CXC motif) ligand 10 (CXCL10) and other cytokines, which can be measured in peripheral samples such as blood or urine. Clinical screening of patients prior to, or during administration of Cox-2 inhibitory therapies should increase their safety profile.
  • the data of the present invention identifies another pathway than the PGI2 synthesis pathway that may be one of the main triggering factors leading to the observed adverse cardiovascular events in human. Alteration in this pathway can be easily monitored in preclinical and clinical studies to avoid such cardiovascular side effects upon cox-2 and/or NSAIDs treatments.
  • Biomarkers or the gene signature identified in this invention can also be used to monitor viral infection/INF ⁇ pathway activation and some vasculopathies in diverse human diseases including several autoimmune and neurodegenerative disorders with or without anti-inflammatory and immunosuppressive treatments. Some of the biomarkers can be used for selection of compounds without potential cardiovascular side-effects.
  • FIG. 1 Principal Component Analysis (PCA) of genomic data from six cardiovascular tissues: iliac vein, pulmonary vein, aorta, carotid artery, heart ventricle, and heart atrium. Only genes encoding for MHC molecules and their receptors were included for PCA analysis. The Vioxx®-treated monkey #A60055 (circled) exhibited distinct expression pattern.
  • PCA Principal Component Analysis
  • FIG. 2 Specific genomics expression pattern in Vioxx®-treated monkey #A60055. The pattern consisted of transcripts for MHC class I, II & class I, non classical molecules, their receptors (TcRs and NK receptors), chemokines (CXCL9, -10, -11, MCP-1). Overall signature indicating strong INF pathway activation together with IL1/TNF and coagulation and complement pathways alteration.
  • FIG. 3 Histopathological evaluation of samples from different tissues confirms the genomic data showing focal vascular necrosis in the veins of Vioxx®-treated animal #A60055 only.
  • the main findings consisted of EC necrosis, leucocytes/fibrin adhesion to EC surface, fibrinoid degeneration of the media and medial leukocyte infiltration.
  • A Iliac vein from vehicle treated animal.
  • B Histopathology findings of endothelial cell (EC) necrosis, fibrin leukocyte adhesion to EC surface, fibrinoid degeneration of the media, medial leukocytes infiltration in iliac vein of the monkey #A60055.
  • FIG. 4 Strong increase of CXCL10 in veins followed by arteries and heart samples from the Vioxx®-treated monkey #A60055 (indicated by an arrow) only.
  • FIG. 5 Protein profiling in serum and plasma from the monkeys.
  • the monkey #A60055 exhibit a specific protein expression profile: Soluble MHC molecules b2-m, other chemokines, cytokines (INF ⁇ , CXCL10, MCP-1, IL18, TNF RII, IL1b), and soluble VCAM-1.
  • Human MAP is used to assess monkey proteins in a Rules-Based Medicine (RBM®) multiplex assay.
  • FIG. 6 ELISA confirmation of CXCL10 (IP10) protein level in monkey serum samples.
  • the Vioxx®-treated monkey #A60055 exhibits the highest level of CXCL10 protein expression.
  • FIG. 7 ELISA confirmation of INF ⁇ protein level in monkey serum and plasma samples.
  • the Vioxx®-treated monkey #A60055 exhibits the highest level of INF ⁇ protein expression.
  • FIG. 8 Localisation of PD-ECGF1 protein at the site of vascular lesion.
  • the classical discovery process in the pharmaceutical industry is based on targets (enzymes, receptors, cellular assays, animal and disease models, etc.). Chemicals or biological products are tested, in a high-throughput mode, on a battery of pre-selected different targets.
  • targets enzymes, receptors, cellular assays, animal and disease models, etc.
  • Chemicals or biological products are tested, in a high-throughput mode, on a battery of pre-selected different targets.
  • the weakness of the classical approach are the “artificially disconnected” in vitro target models compared to the tightly interconnected and interdependent relationship of the different targets in a whole organism and the fact that biological activity on all non selected targets is missed.
  • the invention is a “non pre-conceived hypothesis” discovery process to rapidly identify and analyze the biological activity of new products in the whole organism, multi-organs and whole transcriptome. All physiological interactions between the different organs or tissues are present and any cellular pathway or any potential targets could potentially be analyzed in a non artificial system.
  • the mRNA expression changes have been analyzed in several tissue samples from Macaca fascicularis following treatment with the Cox-2 specific inhibitors COX189 (Lumiracoxib®, Novartis), Refocoxib (Vioxx®, Merck), and Celecoxib (Celebrex®, Pharmacia/Pfizer), and with the nonselective NSAID, Diclofenac (Voltaren®, Novartis).
  • the test animal is a vertebrate.
  • the vertebrate is a mammal.
  • the mammal is a primate, such as a cynomolgus monkey (Macaca fascicularis).
  • the administration of an agent or drug to a subject includes self-administration and the administration by another.
  • the “treatment group” of animals received a substance (test item, compound, drug) in a vehicle compound suitable for administration of the substance or the combination of substances, while the “control” (or “baseline”) group should receive the vehicle compound only.
  • biological specimen such as tissue pieces (e.g. obtained by biopsy), or body fluids, such as blood, plasma, serum, urine, or saliva, can be sampled.
  • body fluids such as blood, plasma, serum, urine, or saliva
  • all animals of all groups can be sacrificed and biological specimen such as whole organs or pieces thereof can be sampled. All sampled specimen can be stored as known in the art for further analysis that include, but are not limited to, RT-PCR, Northern blotting, in-situ hybridization, gene expression profiling with microarrays.
  • the invention begins with differentially expressed transcripts in different cardiovascular tissues and proteins in plasma between normal monkeys and cox-2 inhibitory compounds/drugs-treated monkeys with regard to the identification and validation of potential targets and the identification of biomarkers for cardiovascular side effects.
  • Gene expression profiles After a period of time (e.g., four weeks) of compound/drug administration, the treated animals are necropsied. 120 tissues are dissected and rapidly snap-frozen for genomics analysis. Organ samples are isolated for histopathological examinations and for gene expression localizations, such as by in situ hybridization.
  • the methods of detecting the level of expression of mRNA are well-known in the art and include, but are not limited to, reverse transcription PCR, real time quantitative PCR, Northern blotting and other hybridization methods.
  • a particularly useful method for detecting the level of mRNA transcripts obtained from a plurality of genes involves hybridization of labelled mRNA to an ordered array of oligonucleotides. Such a method allows the level of transcription of a plurality of these genes to be determined simultaneously to generate gene expression profiles or patterns.
  • a gene expression profile is diagnostic when the increased or decreased gene expression is an increase or decrease over the baseline gene expression following administration of a compound.
  • the technique for detecting gene expression includes the use of a gene chip.
  • the construction and use of gene chips are well known in the art. See, U.S. Pat Nos. 5,202,231; 5,445,934; 5,525,464; 5,695,940; 5,744,305; 5,795,716 and 5,800,992. See also, Johnston, M. Curr Biol 8:R171-174 (1998); Iyer Y R et al., Science 283:83-87 (1999) and Elias P, “New human genome ‘chip’ is a revolution in the offing” Los Angeles Daily News (Oct. 3, 2003).
  • GeneChip® experiment All GeneChip® experiments were conducted in the Genomics Factory EU following recommendations by the manufacturer of the GeneChip® system (Affymetrix, Expression Analysis Technical Manual (Affymetrix, Santa Clara, Calif., 2005). Human U133A genome arrays were used for transcript expression analysis. Double stranded cDNA was synthesized with a starting amount of approximately 5 ⁇ g full-length total RNA using the Superscript Choice System (Invitrogen Life Technologies) in the presence of a T7-(dT) 24 DNA oligonucleotide primer.
  • the cDNA was purified by phenol/chloroform/isoamyl alcohol extraction and ethanol precipitation. The purified cDNA was then transcribed in vitro using the BioArray® High Yield RNA Transcript Labeling Kit (ENZO) in the presence of biotinylated ribonucleotides form biotin labelled cRNA. The labelled cRNA was then purified on an affinity resin (Rneasy, Qiagen), quantified and fragmented. An amount of approximately 10 ⁇ g labelled cRNA was hybridized for approximately 16 hours at 45° C. to an expression probe array.
  • EZO BioArray® High Yield RNA Transcript Labeling Kit
  • the array was then washed and stained twice with streptavidin-phycoerythrin (Molecular Probes) using the GeneChip Fluidics Workstation 400 (Affymetrix).
  • the array was then scanned twice using a confocal laser scanner (GeneArray Scanner®, Agilent) resulting in one scanned image.
  • This resulting “.dat-file” was processed using the MAS5 program (Affymetrix) into a “.cel-file”.
  • the “.cel file” was then transferred to tan Affymetrix GeneChip Laboratory Information Management System (LIMS) database, which is connected to a UNIX Sun Solaris server through a network filing system that allows for the average intensities for all probes cells (CEL file) to be downloaded into an Oracle database (NPGN).
  • LIMS GeneChip Laboratory Information Management System
  • Raw data was converted to expression levels using a “target intensity” of 100.
  • the numerical values displayed are weighted averages of the signal intensities of the probe-pairs comprised in a probe-set for a given transcript sequence (AvgDiff value).
  • the data were checked for quality and loaded in the GeneSpring® software versions 5.0 (Silicon Genetics, Calif., U.S.) for statistical analysis.
  • Principal component analysis of transcriptome data Using SIMCA 10.5 software (Umetrics Inc, Kinnelon N.J., USA), Principal Component Analysis (PCA) was performed on all data generated by the microarrays or on genes present at least in 2 out of 4 samples in at least 1 group to determine general expression differences/similarities among the samples and identify potential biological or technical outliers. A projection was made on the first two or three principal components for each tissue.
  • the differences between samples represent differences in the level of expression or in the correlation structure of the genes used for the PCA model.
  • MAP Multi-Analyte Profile
  • PCA Principle Component Analysis
  • Vioxx®-induced cox-2 inhibition provides a potential link to the increased risks of cardiovascular side effects occurring in patients treated with Vioxx®:
  • the majority of the observed gene expression changes have been known to be directly involved in the pathogenesis of diverse cardiovascular diseases including atherosclerosis, CAD, thrombosis, autoimmune and neurodegenerative diseases.
  • INF ⁇ inducible gene expression changes the most striking increase was observed for CXCL10 and other chemokines, e.g., CXCL-9, -11 and MCP-1 (CCL-2) ( FIG. 4 and TABLE 1).
  • Vioxx® exhibits increased angiostatic and focal inflammatory effects predominantly in veins:
  • the in vivo angiogenic effect of PGE2 is well documented experimentally and in particular by the fact that the EP4 receptor signalling has a major role in regulating closure or maintaining potency of the ductus arteriosus in newborns with congenital heart disease.
  • Vioxx® strongly induced the expression of CXCL10, and PD-ECGF (both known anti-angiogenic proteins) mainly in iliac and pulmonary veins which suggests that a strong angiostatic effect occurred in the monkey #A60055.
  • chemokines mainly CXCL10, MCP-1 and at a lesser degree other chemokines e.g., CXCL9 and -11 were significantly upregulated (e.g., 150 fold increase for MCP-1 in pulmonary vein). It has been shown that atheroma-associated endothelial cells express CXCL10, CXCL9 and CXCL11. Their secretion from IFN ⁇ -stimulated ECs is increased upon IL-1beta, TNF-alpha, and CD40 ligand treatments and decreased in the presence of nitric oxide. Mach F et al., J Clin Invest. 104(8):1041-50 (October 1999).
  • mice CMV infection in an atherosclerosis animal model and in cholesterol-fed C57BL/6J mice significantly increases atherosclerotic lesion area and aortic expression of CXCL10, MCP-1, and other INF-gamma induced proteins. Burnett M S et al., Circulation. 109(7):893-7 (Feb. 24, 2004). Similarly, mouse CMV infection in the brains of immunodeficient mice, stimulates the production of CXCL10 and MCP-1. Cheeran M C et al., J Neurovirol. 10(3):152-62 (June 2004).
  • Literature data demonstrate that the induction of COX-2 and/or synthesis of PGE2 are essential for efficient CMV replication in human (Zhu H et al., Proc. Natl. Acad. Sci. USA 99:3932-3937 (2002)) and monkey (Rue C A et al., J Virol. 78(22):12529-36 (November 2004)).
  • the rhesus cytomegalovirus (RhCMV) genome encodes a protein homologue to cellular cox-2 (vCOX-2).
  • vCOX-2 rhesus cytomegalovirus
  • cPLA2 a key enzyme in arachidonic acid (AA) release, is the primary form of PLA2 responsible for the generation of PGE2, LTB4 and PAF from AA, in response to inflammatory stimuli. It has been established that cPLA2 exhibits antihypertrophic potential probably via signalling pathway of ⁇ 2-ARs in heart. Pavoine C & Defer N, Cell Signal. 17(2):141-52 (February 2005). PLA2 signalling pathways has been shown to be involved in human CMV infection in several ways.
  • hCMV infection stimulates arachidonic acid metabolism associated with activation of PLA2 and a cellular cPLA2,
  • both mRNAs encoding for cPLA2 and COX-2 are increased in infected cells,
  • cPLA2 taken up by virus particles from infected cells plays a role in CMV infection at a post entry step.
  • the inhibition of hCMV-borne cPLA2 had broader consequences on HCMV infection inhibiting the production of key viral antigens 1E1, 1E2 and pp65.
  • CMV is known as a strictly opportunistic pathogen, in immunocompetent individuals it is easily controlled yet never eliminated since a robust immune response suppresses persistent viral replication and facilitates a lifelong viral latency. In fact, CMV has several mechanisms to escape diverse host immune responses. CMV encodes for at least four proteins which interfere with classical MHC class I antigen presentation by preventing their cell surface expression, by transporting them to the cytosol, where they are degraded and by competing with TAP for the translocation of antigenic peptides to MHC molecules. However, evasion of MHC I is not perfect, since IFN ⁇ activation by CMV can induce the synthesis of large quantities of MHC I and proteosomes that overwhelm viral inhibitory proteins and “rescue” the CTL response.
  • CMV-encoded proteins also interact with non-classical MHC class I such as HLA-E, which leads to suppression of NK responses.
  • CMV encode for the UL18 which has homology to MHC I heavy chain and is expressed on the cell surface. Disruption of UL18 severely restricts viral pathogenesis. CMV also interferes with MHC II presentation, which was strongly upregulated in the Vioxx®-treated monkey (TABLE 1).
  • INF-gamma is a potent inducer of MHC II expression in many cell types including endothelial cells. However, some studies showed that in CMV-infected cells, IFN-gamma is unable to induce MHC II expression.
  • MHC class II molecules expressed in EC have been proposed as the entry receptor for CMV.
  • CMV infection also induces alteration in the expression of important cytokines such as TNF, TGF beta and IL1 and upregulation of the complement control proteins CD46, and CD55.
  • CMV also encodes for a surface Fc-receptor which can bind IgG with high affinity.
  • expression of most of these genes including MHC molecules, several NK cell receptors, complement proteins, Fc receptors was significantly upregulated in the monkey #A60055.
  • Toll like receptor 2 and CD14 were significantly increased in several tissues from the Vioxx®-treated monkey. Recently, it has been shown that CMV activates inflammatory cytokine responses via TLR2/CD14 during the prereplication phase of the viral life cycle. Indeed, interferon and ISGs are robustly induced by CMV particles during entry via activation of IRF3, one of the key transcription factors for INF ⁇ inducible genes. Later during the replication cycle, CMV encodes several chemokines and chemokine receptors that provide potent inflammatory signals. In fact, many of the pathological processes associated with CMV reactivation (including accelerated vascular disease, and graft rejection) appear to be mediated by the release of inflammatory cytokines.
  • CMV reactivation in the vascular system and use of anti-inflammatory compounds including NSAIDs and specific Cox-2 inhibitors A number of infectious agents have been associated with atherosclerotic cardiovascular disorders, including CMV, Helicobacter pylori, EBV, HIV, HSV1, HSV2, and hepatitis B and C. Rue C A et al., J Virol. 78(22):12529-36 (November 2004). However, several reports in the literature suggest that the CMV infection/reactivation might be one of the major players in the pathogenesis of chronic inflammatory vascular diseases.
  • CMV vasculitis For examples, rare cases of CMV vasculitis have been described even in healthy individuals, which may be associated with carotid intimal-medial thickening, or development of extensive mesenteric arterial and venous thrombosis. Other studies suggest that CMV infection or reactivation is involved in post-transplant sub endothelium/intramyocardial inflammation, atherogenesis, restenosis, and inflammatory abdominal aortic aneurysm. Koskinen P K et al., Transpl Infect Dis. 1(2):115-26 (June 1999)).
  • CMV induced lytic or inflammatory reaction in ECs may easily result in adherent thrombi formation in vivo.
  • infection/reactivation of CMV in endothelial cells may cause vascular injury and promote the development of inflammation, atherosclerotic lesions, and thrombosis. Therefore, the observed vascular findings in this analysis might be the early indicators of a CMV vasculitis.
  • a selective cox-2 inhibitor NS398, potentiates CXCL10 synthesis upon INF ⁇ stimulation by preventing PGE2 production and PKA activation.
  • Wright K L et al. Br J Pharmacol. 141(7):1091-7 (April 2004).
  • Vioxx® has similar potentialization effect on the INF ⁇ pathway activation as described for NS398.
  • the Vioxx® treatment might lower the threshold for the generation of a chronic vascular inflammation via inhibition of PGE2 and activation of INF ⁇ pathways triggered by reactivation of a latent CMV infection in endothelial cells.
  • Soluble proteins present in serum and plasma of the same monkeys have been measured using a multiplex assay produced by Rules-Based Medicine (RBM®) of Texas. The results were in line with the genomic results showing the increased level of INF ⁇ inducible proteins only in the Vioxx®-treated monkey ( FIG. 5 ).
  • Phospholipase A2 enzymes in membrane trafficking: mediators of membrane shape and function. Traffic 4:214-221.

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US9738932B2 (en) 2017-08-22
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