WO2014114207A1 - 一种三齿型连接子及其应用 - Google Patents
一种三齿型连接子及其应用 Download PDFInfo
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- WO2014114207A1 WO2014114207A1 PCT/CN2014/070780 CN2014070780W WO2014114207A1 WO 2014114207 A1 WO2014114207 A1 WO 2014114207A1 CN 2014070780 W CN2014070780 W CN 2014070780W WO 2014114207 A1 WO2014114207 A1 WO 2014114207A1
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- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
- A61K47/6889—Conjugates wherein the antibody being the modifying agent and wherein the linker, binder or spacer confers particular properties to the conjugates, e.g. peptidic enzyme-labile linkers or acid-labile linkers, providing for an acid-labile immuno conjugate wherein the drug may be released from its antibody conjugated part in an acidic, e.g. tumoural or environment
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P37/00—Drugs for immunological or allergic disorders
- A61P37/02—Immunomodulators
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/32—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against translation products of oncogenes
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/90—Immunoglobulins specific features characterized by (pharmaco)kinetic aspects or by stability of the immunoglobulin
- C07K2317/92—Affinity (KD), association rate (Ka), dissociation rate (Kd) or EC50 value
Definitions
- the present invention relates to the use of antibody drug conjugates for the treatment of tumors or other diseases, and in particular to the use of a particular tridentate linker for the preparation of antibody drug conjugates to control drug/antibody ratio (DAR).
- DAR drug/antibody ratio
- ADCs antibody drug conjugates
- Antibody drug conjugates generally consist of three components: an antibody or antibody ligand, a small molecule drug, and a linker that couples the ligand to the drug.
- the mechanism of action of the antibody drug conjugate is as follows: The antibody or antibody ligand specifically recognizes and binds to the cell surface antigen; the formed conjugate enters the cell by endocytosis while bringing the small molecule drug into the cell; Enzymatically or the linker itself cleaves, and the small molecule drug is released as a suitable active ingredient to kill the target cell.
- Small molecule cytotoxic drugs used in antibody drug conjugates are very active and are typically 10-1000 times more active than current chemotherapeutic drugs. Cytotoxic drugs for antibody drug conjugates mainly include maytansinoids
- the linker used in the antibody drug conjugate needs to meet the following requirements: It has sufficient stability outside the cell to ensure that the small molecule drug does not detach from the ligand; after entering the cell, the cleavable linker is broken under appropriate conditions and released. Active small molecule drugs; For non-cleavable linkers, the active ingredient consists of small molecules, linkers, and amino acid residues produced by enzymatic hydrolysis of the ligand.
- cytotoxic drugs are usually lysine residues attached to the surface of the ligand via a linker, or cysteine residues in the hinge region of the antibody (by the chain)
- the optimal drug/ligand ratio (DAR) is 2-4 for partial reduction of the disulfide bond.
- the non-selectivity of the coupling reaction resulting in uncertainty in the number of couplings and sites, which in turn leads to heterogeneity of the resulting antibody drug conjugate.
- the DAR value distribution of T-DM 1 (average DAR value of 3.5) is 0-8 (Lazar et al., 2005, Rapid Commun.
- the heterogeneity of the antibody drug conjugate product can result in pharmacokinetic properties, potency, and toxicity heterogeneity among the various component components. For example, components with higher DAR values are cleared faster in vivo and result in higher toxicity (Boswell et al, 201 1 , Bioconjugate Chem. 22: 1994-2004).
- a balanced transfer thiolation cross-coupling reagent was developed for site-directed coupling technology that reacts with antibodies that are fully reduced/partially reduced to thiol in the hinge region to generate cross-coupling Structure (Liberatore et al, Bioconjugate Chem. 1 : 36-50; del Rosario et al, 1990, Bioconjugate Chem. 1: 51-59).
- Cross-coupled products not only have low yields (around 30%), but also poor homogeneity, containing 0 to 4 sets of cross-coupling components.
- LegoChem Biosciences (LCB) of South Korea reported a site-directed coupling technique that included a site-specific functionalization step and an orthogonal drug coupling step, but the details of the technique were not disclosed (BioSpectrum, 2012, 39).
- the present invention is directed to a novel tridentate linker that can be used in a chemical coupling process for the preparation of antibody drug conjugates.
- an antibody drug conjugate as shown in Formula I there is provided an antibody drug conjugate as shown in Formula I,
- L is an antibody, antibody fragment or protein
- T is a tridentate linker moiety
- A is a linker moiety
- D is a drug moiety
- n is an integer ranging from 0-8;
- w is a substituted aryl, heteroaryl, hydrazino, cyclodecyl, heterocycloalkyl, or any combination thereof.
- the A is a cleavable linker combination or a non-cleavable linker; more preferably, the structure of the A is as shown in Formula III or IV:
- C is a cleavable linker
- E is a suicide linker
- e is an integer in the range 0-5
- G is an unbreakable linker
- g is an integer in the range 0-5.
- the structure of the antibody drug conjugate is as shown in formula V, VI, VH or VI:
- L is an antibody, antibody fragment or protein
- L' is an antibody, antibody fragment, protein or other group (such as a thiol group such as cysteine).
- L' is an antibody or antibody fragment, it is the same as L.
- m is 0 or 1;
- R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , and R 9 are independently selected from H, chain mercapto, cyclodecyl, heterocycloalkyl, alkenyl, alkynyl, aryl, heteroaryl;
- R 1 is a chain fluorenyl
- the antibody is an antibody against a cell surface receptor and a tumor associated antigen.
- the drug is a cytotoxic drug, a drug for treating an autoimmune disease, and an anti-inflammatory drug.
- the illustrated three-toothed linker is:
- a three-toothed linker of the structure In a sixth aspect of the invention, there is provided a tridentate linker having the structure of formula IX for use in the preparation of an antibody drug conjugate:
- w is a substituted aryl, heteroaryl, hydrazino, cyclodecyl, heterocycloalkyl, or any combination thereof.
- the formula 1, the formula 2, the formula 3, the formula 4, the formula 5 or the formula 6 is as follows:
- the present invention provides an efficient, simple, and practical chemical coupling method.
- Figure 1 shows six typical three-toothed linker structures and three simplified double-toothed linker structures involved in the present invention.
- FIG. 1 shows the results of polyacrylamide gel electrophoresis (SDS-PAGE) of antibody-tri (or di) tine linker conjugates.
- Figure 3 shows the results of hydrophobic interaction chromatography (HIC) determination of antibody drug conjugates, where a is H-mc- VC MMAE, b is Hl-vcMMAE, c is H-3-vcMMAE, d is H-4-vcMMAE .
- HIC hydrophobic interaction chromatography
- Figure 4 shows the results of size exclusion chromatography (SEC) determination of antibody drug conjugates, where a is H-1- VC MMAE, b is Hl-MMAF, c is H-3-vcMMAE, d is H-3-MMAF , e is H-4-vcMMAE, and f is H-4-MMAF.
- SEC size exclusion chromatography
- Figure 5 shows the results of enzyme-linked immunosorbent assay (ELISA) of antibody drug conjugates, where a is H-1-MMAF and H-1-vcMMAE, and b is H-3-MMAF and H-3-vcMMAE, c It is H-4-MMAF and H-4-vcMMAE.
- ELISA enzyme-linked immunosorbent assay
- Figure 6 shows the results of cell proliferation inhibition experiments of antibody drug conjugates, where a is Hl-MMAF, H-3-MMAF and H-4-MMAF, and b is Hl-vcMMAE, H-3-vcMMAE and H-4 -vcMMAE.
- the inventors After extensive and intensive research, the inventors have surprisingly found that the "tridentate linker" can cross-couple the light chain-heavy chain and heavy chain-heavy chain of the antibody in whole/part, and then find the antibody obtained by this coupling method.
- Drug conjugates have a narrower drug/antibody ratio (DAR) distribution compared to traditional antibody drug conjugates.
- DAR drug/antibody ratio
- the "tridentate linker" provided by the present invention comprises two maleimide units and a third coupling group.
- Two maleimide units are used to crosslink the sulfhydryl group between the antibody chains (after reduction), while a third coupling group is used to couple to the small molecule drug or drug-linker unit:
- the resulting antibody drug conjugate can be used to target delivery of a drug to a target cell population, such as a tumor cell.
- the antibody drug conjugate can specifically bind to cell surface proteins, and the resulting conjugate is then endocytosed by the cells. Within the cell, the drug is released as an active drug to produce efficacy.
- the antibody includes a chimeric antibody, a humanized antibody, a human antibody; an antibody fragment which can bind to an antigen; or an antibody Fc fusion protein; or a protein.
- Drugs are highly active drugs, including, but not limited to, Maytansinoids, Auristatins, Calicheamicins, doxorubicins, benzodiazepines Pyrrole antibiotics (Duocarmycins and CC-1065), pyrrolobenzodiazepine dimers (PBDs), and the like.
- the drug can be polyethylene glycol.
- the drug or drug-linker unit is coupled to the antibody via a tridentate linker to form a partial interchain crosslinked conjugate.
- the drug drug-conjugate ratio (DAR) distribution of the antibody drug conjugate prepared by the method of the present invention is narrower than that of the conventional antibody drug conjugate, thereby greatly improving product homogeneity and pharmacological property uniformity. Definition
- an “antibody” or “antibody unit”, within its scope, includes any portion of an antibody structure. This unit can bind, responsively associate, or complex a receptor, antigen, or other receptor unit that the cell population has.
- the antibody can be any protein or proteinaceous molecule that can bind, complex, or react with a portion of the cell population to be treated or bioengineered.
- the antibody constituting the antibody drug conjugate of the present invention preferably retains the antigen binding ability in its original wild state. Therefore, the antibody of the present invention can, preferably, specifically bind to an antigen.
- Antigens involved include, for example, tumor associated antigen (TAA), cell surface receptor proteins and other cell surface molecules, cell survival regulators, cell proliferation regulators, molecules associated with tissue growth and differentiation (as known or predicted) Functional), lymphokines, cytokines, molecules involved in cell cycle regulation, molecules involved in angiogenesis, and molecules involved in angiogenesis (as known or predicted to be functional).
- TAA tumor associated antigen
- the tumor associated factor can be a cluster differentiation factor (such as a CD protein).
- the antigen bound to the antibody of the present invention may be one or a subset of the above classifications, while the other subsets contain other molecules/antigens having specific properties (compared to the target antigen).
- Antibodies for use in antibody drug conjugates include, but are not limited to, antibodies directed against cell surface receptors and tumor associated antigens. Such tumor associated antigens are well known in the art and can be prepared by antibody preparation methods and information well known in the art.
- tumor associated antigens are well known in the art and can be prepared by antibody preparation methods and information well known in the art.
- To develop effective cell-level targets for cancer diagnosis and treatment researchers are looking for transmembrane or Other tumor related polypeptides. These targets are capable of being specifically expressed on the surface of one or more cancer cells with little or no expression on the surface of one or more non-cancer cells. Typically, such tumor-associated polypeptides are more overexpressed on the surface of cancer cells relative to the surface of non-cancer cells. Confirmation of such tumor-associated factors can greatly enhance the specific targeting properties of antibodies based on cancer treatment.
- Tumor-associated antigens include, but are not limited to, the tumor-associated antigens listed below (1) - (36). For convenience, antigen-related information well known in the art is indicated below, including name, other name, and gene bank accession number. Nucleic acid and protein sequences corresponding to tumor associated antigens can be found in public databases such as Genbank. Antibody-targeting corresponding tumor-associated antigens include all amino acid sequence variants and homologs, having at least 70%, 80%, 85%, 90%, or 95% homology to the sequences identified in the references, or The tumor-associated antigen sequences cited in the literature have completely identical biological properties and characteristics.
- Tumor-associated antigen (1) - (36) Tumor-associated antigen (1) - (36) :
- BMPR1B (Bone Morphogenetic Protein Receptor - Type IB, Genbank Accession No. NM_001203);
- MPF MPF, MSLN, SMR, megakaryocyte potentiating factor, mesothelin, Genbank accession number NM_005823
- Napi3b (NAPI-3B, NPTIIb, SLC34A2, solute carrier family 34 (sodium phosphate) member 2, type II sodium-dependent phosphate transporter 3b, Genbank accession number NM_006424);
- Sema 5b (FLJ10372, KIAA1445, Mm.42015, SEMA5B, SEMAG, brain signaling protein 5b Hlog, sema domain, seven thrombospondin repeats (type 1 and class 1), transmembrane domain (TM) And a short cytoplasmic domain,
- PSCA hlg (2700050C12Rik, C530008016Rik, RIKEN cDNA 2700050C12, RIKEN cDNA 2700050C12 gene, Genbank accession number AY358628);
- ETBR endothelin type B receptor, Genbank accession number AY275463
- MSG783 (RNF124, hypothetical protein FLJ20315, Genbank accession number NM_017763);
- STEAP2 (HGNC 8639, IPCA-1, PCANAP1, STAMP 1, STEAP2, STMP, Prostate Cancer Related Gene 1, Prostate Cancer Associated Protein 1, Six Transmembrane Prostate Epithelial Antigen 2, Six Transmembrane Prostaglandin , Genbank accession number AF455138);
- TrpM4 (BR22450, FLJ20041, TRPM4, TRPM4B, transient receptor potential cation channel, subfamily M, member 4, Genbank accession number NM_017636);
- CRIPTO (CR, CR1, CRGF, CRIPTO, TDGF1, teratoma-derived growth factor, Genbank accession number NP_003203 or NM_003212);
- CD21 (CR2 (complement receptor 2) or C3DR (C3d/EB virus receptor) or Hs.73792, Genbank accession number M26004);
- CD79b (CD79B, CD79p, IGb (immunoglobulin-associated beta), ⁇ 29, Genbank accession number NM_000626);
- FcRH2 (IFGP4, IRTA4, SPAP1A (SH2 domain containing phosphatase-anchored protein la), SPAP1B, SPAP1C, Genbank accession number NMJB0764); (17) HER2 (ErbB2, Genbank accession number Ml 1730);
- NCA (CEACAM6, Genbank accession number Ml 8728);
- IL20Ra (IL20Ra, ZCYTOR7, Genbank accession number AF184971);
- EphB2R (DRT, ERK, Hek5, EPHT3, Tyro5, Genbank accession number NM_004442);
- PSCA prostate stem cell antigen precursor, Genbank accession number AJ297436
- BAFF-R B cell activating factor receptor, BLyS receptor 3, BR3, Genbank accession number AF116456);
- CD22 B cell receptor CD22-B isoform, Genbank accession number AK026467
- CD79a (CD79A, CD79a, immunoglobulin-related a, is capable of covalent interaction with Ig ⁇ (CD79B) and forms a complex with Ig M molecules on the surface, transducing B cell-specific proteins involved in B cell differentiation signals , Genbank accession number NP_001774.1);
- CXCR5 (Burkitt's Lymphoma Receptor 1, a G-protein coupled receptor activated by CXCL13 chemokine, plays a role in lymphocyte migration and humoral defense, in HIV-2 infection and possibly Play a role in AIDS, lymphoma, myeloma, and leukemia, Genbank accession number NP_001701.1);
- HLA-DOB the beta subunit of the MHC class II molecule (la antigen), which binds to the peptide and presents it to CD4+ T lymphocytes, Genbank accession number NP_002111.1);
- P2X5 ( ⁇ receptor P2X ligand-gated ion channel 5, an ion channel gated by extracellular ATP, may be involved in synaptic transmission and neuronal regeneration, and its defects may lead to pathology of idiopathic detrusor instability Physiological status, Genbank accession number
- CD72 B cell differentiation antigen CD72, Lyb-2, Genbank accession number NP_001773.1
- LY64 lymphocyte antigen 64 (RP105), a leucine-rich type I membrane protein (LRR) family that regulates B cell activation and apoptosis, and loss of function is associated with increased disease activity in patients with systemic lupus erythematosus , Genbank accession number
- FcRH1 Fc receptor-like protein 1, putative immunoglobulin Fc domain receptor, including C2-type Ig-like and ITAM domains, may play a role in B lymphocyte differentiation, Genbank accession number NP_443170.1 );
- IRTA2 translocation-associated immunoglobulin superfamily receptor 2, putative immunoreceptors, may play a role in B cell development and lymphoma production; genetic disorders caused by translocation occur in some B cell malignancies On, Genbank accession number
- drug or the code “D” refers broadly to any compound having the desired biological activity and having reactive functional groups for the preparation of the conjugates of the invention.
- the desired biological activity includes, diagnosis, cure, relief, treatment, prevention of diseases in humans or other animals. Therefore, as long as it has the necessary reactive functional groups, the term “drug” refers to the combination
- the substance includes the official National Pharmacopoeia, as well as drugs such as the US Official Homeopathic Pharmacopoeia, the official National Formulary, or any of its supplements.
- Typical drugs are listed in the physician's desk medication reference (PDR) and the US Food and Drug Administration (FDA) Orange Book. As new drugs are constantly being discovered and developed, this patent states that these drugs should also be incorporated into the drug-conjugated prodrugs of the present invention.
- PDR physician's desk medication reference
- FDA US Food and Drug Administration
- the drug refers to: a cytotoxic drug for cancer treatment; a protein or polypeptide having a desired biological activity, such as a toxin such as acacia toxin, ricin A, and pseudomonas Toxins, and diphtheria toxins; other suitable proteins include tumor necrosis factor, alpha-interferon, beta-interferon, neurogenic growth factor, platelet-derived growth factor, tissue-type fibrinolytic growth factor, and biological response modulation agents, For example, lymphokines, interleukin-1 (IL-1), interleukin-2 (IL-2), interleukin-6 (IL-6), granulocyte macrophage colony-stimulating factor (GM-CSF) , granulocyte colony-stimulating factor, or other growth factors.
- a cytotoxic drug for cancer treatment a protein or polypeptide having a desired biological activity, such as a toxin such as acacia toxin, ricin A, and pseudomonas Toxins, and dip
- the drug is maytansine or maytansinoid.
- Maytansine compounds inhibit cell proliferation by inhibiting microtubule formation by tubulin (Temillard et al (1975) Science 189: 1002-1005; U.S. Pat. No. 5,208,020).
- Maytansin is a derivative of maytansine. Both maytansine and maytansine are highly cytotoxic, but they have significant limitations in the clinical application of cancer therapy, mainly due to the low selectivity of such molecules for tumors. However, this high cytotoxicity has prompted them to be the drug of choice for antibody drug conjugates. Listed below are maytansine, maytansinoids, and anti-drugs
- the main raw material for synthetic maytansine is maytansinol, which is mainly obtained by hydrolysis of anthracycline.
- Ansporin can be prepared by fermentation.
- Ansulinin derivatives (WO 2012/061590 ) and alanyl maytansinol (US 2012/0121615 ) are also reported as drug "warheads" for antibody drug conjugates (see the following formula for the molecular structure of these two types) Show).
- ansamitocin derivatives Alaninyl may ansinol
- the drug is an auristatin peptide.
- the auristatin peptide is analogous to Dolastatin 10, which is a biologically active polypeptide isolated from marine mollusk sea rabbits (U S 7498298).
- the rabbit toxin 10 inhibits tubulin polymerization by binding to tubulin (the same binding region as vincristine).
- the rabbit toxin 10, the auristatin peptide PE, the auristatin peptide E are linear polypeptides containing four amino acids (three of which are unique to the sea rabbit toxin compound) and a C-terminal amide group.
- Two representative auristatin peptides, monomethyl auristatin peptide E (MMAE agonin peptide F (MMAF) are the drug of choice for antibody drug conjugates.
- the drug is a calicheamicoid.
- the calicheamicin is an anti-tumor antibiotic that causes apoptosis by binding to the DNA minor groove and causing the cleavage of the double-helix DNA at a specific site.
- Kazimycins have high activity in the sub-picmomolar range in vitro, but their low therapeutic index precludes clinical application prospects. However, this high activity is that they become anti-drugs uzumab Ozogamicin).
- the drug is doxorubicin.
- Doxorubicin is used as a chemotherapy drug because it can embed DNA double helix to block DNA replication.
- the half-inhibitory concentration is 0.1-0.2 micromolar, while the cytotoxic drug activity for antibody drug conjugates is usually sub-nanomolar). It is not common in antibodies.
- the drug is a benzodipyrrole antibiotic (duocarmycins, CC-1065, etc.) and other cyclopropapyrroloind-4-one (CPI) derivatives.
- CPI cyclopropapyrroloind-4-one
- Such compounds are potent DNA minor groove binding-thiolation reagents.
- the cyclopropabenzindol-4-one (CBI) analogs have a more stable chemical structure, higher biological activity, and are easier to compare with their parental compounds containing natural CPI thiolated subunits. synthesis.
- a representative CBI derivative is the phenolic hydroxyl protected derivative CBI (see formula below), with weakened prodrug toxicity and enhanced water solubility.
- the drug is pyrrolo[2,l-c][l,4]benzodi-azepines (PBDs) or a PBD dimer (PBD dimer S ).
- PBD is a natural product produced by Streptomyces and is unique in its ability to form non-twisted covalent additions in the DNA minor groove, specifically at the ⁇ -guanine- ⁇ sequence.
- the use of PBD as a partial small molecule strategy to target locked DNA sequences and as a new class of anticancer and antibacterial drugs has attracted increasing interest (Antonow et al, 2008, Biochemistry 47: 1 1818-1 1829).
- a flexible carbon chain is used to link the C8/C8' hydroxyl groups of the two PBD units, and the resulting dimer has enhanced biological activity (WO 201 1/130616).
- PBD dimers are thought to be capable of producing sequence-selective DNA damage, such as the reversed 5'-Pu-GATC-Py-3' cross-linking, resulting in their biological activity. These compounds have proven to be highly potent cytotoxic drugs and can be used as an alternative to antibody drug conjugates.
- drugs are not limited to the categories mentioned above, but also include all drugs that can be used in antibody drug conjugates.
- linker or “linker of antibody drug conjugate” can be divided into two classes: non-cleavable linkers and cleavable linkers.
- the drug release mechanism is: After the conjugate binds to the antigen and is endocytosed by the cells, the antibody is hydrolyzed in the lysosome, releasing the small molecule drug, which is linked An active molecule composed of an amino acid residue of an antibody. The resulting change in the molecular structure of the drug does not diminish its cytotoxicity, but since the active molecule is charged (amino acid residues), it cannot penetrate into adjacent cells. Therefore, such active drugs cannot kill tumor cells (bystander effect) that are not adjacent to the target antigen (antigen-negative cells) (Ducry et al., 2010, Bioconjugate Chem. 21:5-13).
- a cleavable linker can cleave in the target cell and release the active drug (the small molecule drug itself).
- Breakable linkers can be divided into two main categories: chemically labile linkers and enzyme labile linkers.
- Chemically labile linkers can be selectively cleaved due to differences in blood plasma and cytoplasm properties. Such properties include pH, glutathione concentration, and the like.
- a pH-sensitive linker also commonly referred to as an acid-cleaved linker.
- Such a linker is relatively stable in the neutral environment of blood (pH 7.3-7.5), but will be hydrolyzed in weakly acidic endosomes (pH 5.0-6.5) and lysosomes (pH 4.5-5.0).
- Most of the first generation of antibody drug conjugates use such linkers, such as hydrazines, carbonates, acetals, ketals.
- Antibody drug conjugates based on such linkers typically have a shorter half-life (2-3 days) due to the limited plasma stability of the acid-cleaved linker. This shorter half-life limits the use of pH-sensitive linkers in a new generation of antibody drug couples to some extent.
- disulfide bond For glutathione-sensitive linkers, it is also called disulfide bond. Drug release is based on a difference between the high concentration of intracellular glutathione (mmol range) and the relatively low concentration of glutathione (micromolar range) in the blood. This is especially true for tumor cells, where low oxygen levels result in enhanced reductase activity, resulting in higher glutathione concentrations.
- the disulfide bond has thermodynamic stability and therefore has good stability in the blood plasma.
- Enzyme-labile linkers such as peptide linkers, provide better control of drug release.
- Peptide linkers are efficiently cleaved by lysosome in vivo proteases such as cathepsin B or plasmin (an increase in the amount of such enzymes in some tumor tissues). This peptide linkage is believed to be very stable in the blood plasma cycle because extracellular pH and serum protease inhibitors cause the protease to be generally inactive outside the cell.
- Enzyme-labile linkers are widely used as cleavable linkers for antibody drug conjugates in view of their high plasma stability and good intracellular cleavage selectivity and effectiveness.
- Typical enzyme labile linkers include Val-Cit ( VC ), Phe-Ly S, and the like.
- a suicide linker is typically chimeric between a cleavable linker and an active drug, or is itself a part of a cleavable linker.
- the mechanism of action of the suicide linker is: When the cleavable linker is broken under suitable conditions, the suicide linker can spontaneously rearrange the structure and release the active drug attached thereto.
- Common suicide linkers include p-aminobenzyl alcohol (PAB) and beta-glucuronide ( ⁇ -Glucuronide).
- PAB p-aminobenzyl alcohol
- ⁇ -Glucuronide beta-glucuronide
- the antibody drug conjugates provided by the present invention consist of an antibody, a tridentate linker, a linker and a drug, and the linker is a cleavable linker combination or a non-cleavable linker.
- Antibodies are globular proteins that contain a range of amino acid sites that can be used to couple drug-linkers. Due to its tertiary and quaternary structure, only solvent accessible amino acids are available for coupling. In fact, high yield couplings typically occur on the ⁇ -amino group of the lysine residue or the thiol group of the cysteine residue.
- a large number of lysine side chains on the surface of the antibody protein result in a large number of sites for drug coupling, resulting in a mixture of antibody drug conjugates that are produced, containing different drug coupling amounts (drug/antibody ratio, DAR) and Joint point.
- DAR drug/antibody ratio
- the coupled product provided by the present invention although still a mixture, has a narrow DAR distribution range compared to the antibody drug conjugate obtained by conventional coupling.
- the average DAR value is close to 4, which is close to the optimal DAR value (2-4) of the optimal antibody drug conjugate.
- linker size the distance between the two maleimide groups (referred to as linker size) may directly affect the efficiency of tridentate linker cross-linking between antibody chains.
- the inventors synthesized a series of tridentate linkers with different sizes, as well as a simplified mode of a tridentate linker (a bidentate linker that does not contain a drug-coupled group). These linkers were reacted with the reduced antibody, and the resulting conjugate was analyzed by polyacrylamide gel electrophoresis (SDS-PAGE) and hydrophobic interaction chromatography (HIC) to examine the effect of linker size on cross-linking between antibody chains. .
- SDS-PAGE polyacrylamide gel electrophoresis
- HIC hydrophobic interaction chromatography
- the coupling step is as follows.
- a linker is coupled to a tridentate linker to obtain a tridentate linker-linker (T-L).
- T-L is coupled to a drug molecule (D) to obtain a tridentate linker-linker-drug (T-LD).
- D drug molecule
- T-LD tridentate linker-linker-drug
- step C the interchain disulfide bond is reduced to produce a total of 8 thiol groups.
- the T-LD is thiolated/fully cross-linked antibody drug conjugate with the reduced antibody.
- the antibody drug conjugate provided by the invention targets a specific cell population, binds to a cell surface specific protein (antigen), and the conjugate is endocytosed into the cell, and the drug is released into the cell in an active form.
- the invention provides an antibody drug conjugate, which targets a specific cell population and combines with a cell surface specific protein (antigen) to produce an effect; or releases the drug outside the cell, and the drug penetrates into the cell to produce efficacy.
- a cell surface specific protein antigen
- the invention provides a complex comprising an effective amount of a drug conjugate and a pharmaceutically acceptable carrier or vehicle.
- the present invention provides a method of treating cancer or other tumors in an animal, which is to give cancer or other swelling Tumored animals use a therapeutically effective amount of an antibody drug conjugate provided by the present invention.
- the present invention provides a method of treating a self-immune disease or an inflammatory disease, which method comprises administering to a patient suffering from an autoimmune disease or an inflammatory disease a therapeutically effective amount of an antibody drug conjugate provided by the present invention.
- the coupling method provided by the present invention is suitable for most antibodies, thereby avoiding cumbersome recombination of each antibody to introduce a site-directed coupling site, and thus has broad application prospects.
- the novel tridentate linker provided by the present invention can be coupled to an antibody by a simple chemical method. Although the antibody drug conjugate produced by this method still does not have complete homogeneity, the DAR value distribution of the conjugate obtained by using this linker is very narrow compared to the conventional coupling method, and thus the product is produced. Uniformity has been greatly improved.
- the invention is further illustrated below in conjunction with specific embodiments. It is to be understood that the examples are merely illustrative of the invention and are not intended to limit the scope of the invention.
- the experimental methods in which the specific conditions are not specified in the following examples are usually carried out according to conventional conditions or according to the conditions recommended by the manufacturer. All percentages, ratios, ratios, or parts are by weight unless otherwise stated.
- the unit of weight percent by volume in the present invention is well known to those skilled in the art and, for example, refers to the weight of the solute in a solution of loo milliliters.
- Indirect ELISA is used to determine the binding ability of the antibody or antibody drug conjugate to the corresponding antigen:
- the Her2 antigen is ligated to a solid phase carrier (96-well microplate) to form a solid phase antigen, and the unbound antigen is removed by washing; a gradient-diluted antibody or a test antibody drug conjugate, wherein the specific antibody binds to the antigen to form a solid phase antigen-antibody complex, and the antibody or antibody drug conjugate not bound to the solid phase antigen is washed and removed;
- the anti-antibody is bound to the antibody or ADC antibody bound to the solid phase antigen, and the unbound anti-antibody is washed and removed; the substrate solution is added, and the optical density value at 450 nm/630 nm is read by a microplate reader. Draw a curve and calculate the EC 50 .
- the cytostatic activity of an antibody or antibody drug conjugate is determined by: contacting a mammalian cell expressing a tumor associated antigen or receptor protein with an antibody or antibody drug conjugate in a cell culture medium; Incubate for 2 to 5 days; determine the number of cells.
- IC 5 cell viability
- EC 5 . fine Cytotoxicity
- induction of apoptosis by antibody drug conjugates aspartase activation
- Nuclear magnetic resonance spectra were acquired on a Bmker A vanC e III 500 M NMR spectrometer.
- the chemical shift ( ⁇ ) is in ppm, with tetramethylsilyl fluorene as the reference system (chemical shift is 0), and the coupling constant (J) is in Hz.
- Trifluoroacetic acid in the ⁇ phase (aqueous phase, containing 0.01% TFA) at a flow rate of 2.3 mL/min and a column temperature of 50 °C; Alkaline high performance liquid chromatography using a Waters Xbridge C18 reversed phase column (4.60) x 50 mm, 3.5 ⁇ ) Separation, eluent gradient 5%-95% 1.5 phase (acetonitrile) in 1.5 minutes in ⁇ phase (aqueous phase, containing 10 mM ammonium bicarbonate) at a flow rate of 2.0 mL/min, The column temperature is 40 °C.
- Preparative HPLC purification was performed on a Gilson instrument using a Waters Sunfire C18 reversed-phase column (250 x 19 mm, 10 ⁇ ).
- the mobile phase was an aqueous phase-acetonitrile gradient eluent containing 0.1% TFA.
- the cell line used was SK-BR-3 human breast cancer cells. This cell line was obtained from ATCC.
- Her2 antigen was purchased from Yishen Shenzhou Company (Beijing).
- the enzyme-labeled anti-antibody was purchased from Sigma (Shanghai).
- the substrate solution was purchased from Decent Biotech (Shanghai).
- the Cell Counting Kit-8 (CCK-8) Cell Proliferation-Toxicity Test Kit was purchased from Dojindo (Shanghai).
- the antibody drug conjugate H-1-vcMMAE was prepared according to the procedure of General Procedure B.
- the antibody drug conjugate H-1-MMAF was prepared according to the procedure of General Procedure B.
- Example 41 The antibody drug conjugate H-1-MMAF was prepared according to the procedure of General Procedure B.
- the antibody drug conjugate H-3-vcMMAE was prepared according to the procedure of General Procedure B.
- the antibody drug conjugate H-3-MMAF was prepared according to the procedure of General Procedure B.
- Example 43 The antibody drug conjugate H-3-MMAF was prepared according to the procedure of General Procedure B.
- the antibody drug conjugate H-4-vcMMAE was prepared according to the procedure of General Procedure B.
- the antibody drug conjugate H-4-MMAF was prepared according to the procedure of General Procedure B.
- Example 45 The antibody drug conjugate H-4-MMAF was prepared according to the procedure of General Procedure B.
- Herceptin and its antibody drug conjugate to the specific antigen Her2 was determined by enzyme-linked immunosorbent assay. For the specific steps, see the general procedure £, and the test results are shown in Table 1. Antibody drug conjugates still have specific antigen binding compared to Herceptin.
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CA2898939A CA2898939C (en) | 2013-01-23 | 2014-01-17 | Tridentate linkers and use thereof |
KR1020157022368A KR102076219B1 (ko) | 2013-01-23 | 2014-01-17 | 세자리 코넥손 및 그의 용도 |
AU2014210301A AU2014210301B2 (en) | 2013-01-23 | 2014-01-17 | Tridentate connexon and use thereof |
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KR102076219B1 (ko) | 2020-02-11 |
CN103933575A (zh) | 2014-07-23 |
EP2949343A4 (en) | 2016-08-31 |
CA2898939A1 (en) | 2014-07-31 |
KR20150110657A (ko) | 2015-10-02 |
CA2898939C (en) | 2020-12-08 |
AU2014210301A1 (en) | 2015-08-20 |
CN103933575B (zh) | 2017-09-29 |
AU2014210301B2 (en) | 2018-05-17 |
US10960082B2 (en) | 2021-03-30 |
EP2949343B1 (en) | 2020-02-26 |
EP2949343A1 (en) | 2015-12-02 |
ES2781998T3 (es) | 2020-09-09 |
US20160015832A1 (en) | 2016-01-21 |
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