Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
  • C07K16/40—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against enzymes
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
  • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
  • G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K2317/00—Immunoglobulins specific features
  • C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
  • C07K2317/33—Crossreactivity, e.g. for species or epitope, or lack of said crossreactivity
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K2317/00—Immunoglobulins specific features
  • C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
  • C07K2317/34—Identification of a linear epitope shorter than 20 amino acid residues or of a conformational epitope defined by amino acid residues
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
  • G01N2333/90—Enzymes; Proenzymes
  • G01N2333/902—Oxidoreductases (1.)

Definitions

• the present invention relates to an anti-LOXL2 antibody and its use in a method of immunoassay for detecting or quantitating LOXL2.
• L0XL2 is a member of the lysyl oxidase (LOX) gene family in which five LOX family genes have been identified in mammalian genomes encoding the LOX and LOX-like proteins 1 to 4 (LOXL1, LOXL2, LOXL3, and LOXL4 (5,6). The full members of the family have a conserved catalytic domain located at the COOH
• LOX family members are known to be responsible for normal and pathology relevant crosslinking generating increased tissue stiffness, which in uncontrolled state promotes resistance to fibrolysis in fibrotic tissue (8,9) .
• LOX is overexpressed in the microenvironment of fibrotic lesions especially produced by activated fibroblasts (10), with focus on LOXL2 since this is the most highly expressed in advanced fibrosis stage out of nine members of the LOX family (8,11,12) .
• LOX is a copper dependent pro-enzyme that is essential for the stabilization of the ECM, inducing cross-linking via the formation of lysine-derived cross-links, which may constitute an essential defense against the proteolysis executed by nonspecific proteases.
• LOX has the highest affinity for collagens
• LOXL2 activity and expression has been shown to be associated with cancer and fibrosis (9), including signalling roles in cancer proliferation and dedifferentiation, and increased stability of collagens accumulating during fibrosis (14-16) .
• the number of cross-links per collagen molecule has been shown to be elevated in fibrotic tissue compared to healthy state (9) .
• LOX is expressed in most tissues, however LOXL2 appears to be more linked to tissue affected by
• LOXL2 has been found to be over-expressed in lung tissue samples from idiopathic
• pulmonary fibrosis (IPF) patients especially in tissues with activated fibroblasts, reactive pneumocytes and vasculature in fibroblast foci (8,12,17) . This was demonstrated by a dramatic increase in LOX activity during the development of pulmonary fibrosis (8) . Nevertheless, recently the lack of efficacy of a humanized monoclonal antibody employed in a phase III clinical trial including IPF patients was
• the present invention relates to an antibody, wherein the antibody specifically binds to the N-terminus of LOXL2.
• the antibody specifically binds to an N- terminal epitope comprised in the N-terminal amino acid sequence H 2 N-QYDSWPHYPE (SEQ ID NO: 1) .
• the antibody specifically binds to the N-terminal amino acid sequence H 2 N-QYDSWP (SEQ ID NO: 2) .
• the antibody is preferably a monoclonal antibody.
• the antibody does not specifically recognise or bind an N-extended elongated version of said N-terminal amino acid sequence.
• N-extended elongated version of said N-terminal amino acid sequence means one or more amino acids extending beyond the N-terminus of the sequence H 2 N-QYDSWPHYPE (SEQ ID NO: 1) .
• the N-terminal amino acid sequence H 2 N-QYDSWPHYPE SEQ ID NO: 1
• the corresponding "N-extended elongated version" would be H 2 N-AQYDSWPHYPE... (SEQ ID NO: 3) .
• the present invention relates to a method of immunoassay for detecting or quantitating in a sample LOXL2, wherein said method comprises contacting a sample comprising said LOXL2 with an antibody as described supra, and determining the amount of binding of said
• the sample is a biofluid, such as, but not limited to, serum, plasma, urine or amniotic fluid.
• the immunoassay may be a competition assay or a sandwich assay.
• the immunoassay may be, but is not limited to, a radioimmunoassay or an enzyme-linked immunosorbent assay.
• the method of immunoassay may further comprise the step of correlating the quantity of LOXL2 determined by said method with standard LOXL2-associated disease samples of known disease severity to evaluate the severity of said
• LOXL2-associated disease may be, but are not limited to, fibrosis, such as IPF or Chronic Obstructive Pulmonary Disease (COPD) , or cancer, such as non- small cell lung cancer (NSCLC) , small cell lung cancer
• SCLC colon cancer
• melanoma ovarian cancer
• pancreatic cancer pancreatic cancer
• prostate cancer pancreatic cancer
• breast cancer breast cancer
• the method of immunoassay may also be used in the evaluation of the efficacy of novel anti-LOXL2 therapeutics.
• the method further comprises quantifying the amount of LOXL2 in at least two biological samples obtained from a subject at a first time point and at at least one subsequent time point during a period of administration of the anti-LOXL2 therapeutic to the subject. A reduction in the quantity of LOXL2 from the first time point to the at least one subsequent time point during the period of
• administration of the anti-LOXL2 therapeutic is indicative of an efficacious anti-LOXL2 therapeutic.
• anti-LOXL2 therapeutic may be, but is not limited to, small molecule LOXL2-antagonist drugs or biosimilars (e.g. monoclonal antibody therapy) that target and reduce the quantity of LOXL2 in a subject.
• the present invention is directed further to a kit for use in the immunoassay as described herein.
• the kit is a kit for use in the immunoassay as described herein.
• a streptavidin coated 96 well plate a peptide which is reactive with said antibody, which may be a biotinylated peptide H 2 N-QYDSWPHYPE-L- Biotin (SEQ ID NO: 4), wherein L is an optional linker an optionally biotinylated secondary antibody for use in a sandwich immunoassay
• a calibrator peptide comprising the N-terminal sequence H 2 N-QYDSWPHYPE... (SEQ ID NO: 5)
• FIG. 1 Specificity of the LOXL2 ELI SA : The activity of the monoclonal antibody employed in the LOXL2 ELISA towards the target peptide (QYDSWPHYPE ; SEQ ID NO: 1), the elongated peptide (AQYDSWPHYPE ; SEQ ID NO: 3), a non-sense peptide (IKAPKLPGGY; SEQ ID NO: 6) and a non-sense coating peptide (biotin- IKAPKLPGGY ; SEQ ID NO: 7) . Reactivity was shown as percent inhibition of the zero sample (buffer) signal
• Recombinant LOXL2 (rLOXL2) was added in the indicated concentrations to the LOXL2 ELISA.
• the LOXL2 ELISA data are shown as mean of a double determinations for each rLOXL2 concentration.
• Figure 3 LOXL2 was assessed in serum of patients included in two different cohorts.
• parts are parts by weight, molecular weight is weight average molecular weight, temperature is in degrees Centigrade, and pressure is at or near atmospheric.
• molecular weight is weight average molecular weight
• temperature is in degrees Centigrade
• pressure is at or near atmospheric.
• a biotinylated peptide (QYDSWPHYPE- biotin) was included as a coating peptide on streptavidin- coated ELISA plates.
• the specificity of the antibody was tested by including an elongated selection peptide with an additional amino acid added to the N-terminal of the target peptide sequence (AQYDSWPHYPE ; SEQ ID NO: 1), as well as a non-sense selection peptide ( IKAPKLPGGY; SEQ ID NO: 6) and a non-sense biotinylated coating peptide (biotin-IKAPKLPGGY; SEQ ID NO: 7) in the assay validation.
• the immunogenic peptide (QYDSWPHYPE-KLH; SEQ ID NO: 8) was generated by covalently cross-linking the selection peptide to Keyhole Limpet Hempcyanin (KLH) carrier protein using Succinimidyl 4- (N-maleimidomethyl) cyclohexane-l-carboxylate, SMCC (Thermo Scientific, Waltham, MA, USA, cat.no. 22336) .
• mice Four to six weeks old Balb/C mice were immunized by subcutaneous injection of 200 yL emulsified antigen and 50 yg immunogenic peptide (QYDSWPHYPE-KLH; SEQ ID NO: 8) mixed with Freund' s incomplete adjuvant ( Sigma-Aldrich, St. Louis, MO, USA) . Consecutive immunizations were performed at 2-weeks interval until stable sera titer levels were reached. The mouse with the highest titer rested for four weeks were boosted with 50 yg immunogenic peptide in 100 yL 0.9% NaCl solution intravenously.
• Hybridoma cells were produced by fusing spleen cells with SP2/0 myeloma cells as previously described (Gefter ML, Margulies DH, Scharff MD. A simple method for polyethylene glycol-promoted hybridization of mouse myeloma cells. Somatic Cell Genet. 1977;3:231-6). The resultant hybridoma cells were cultured in 96-well microtiter plates and standard limited dilution was used to secure monoclonal growth. The supernatants were screened for
• LOXL2 ELISA protocol selection/standard peptide, relevant native samples including human serum samples and recombinant LOXL2, homolog2 (RnD system, Cat no. 2639-AO).
• LOXL2 ELISA protocol LOXL2 ELISA protocol
• a 96-well streptavidin-coated microtiter plate was coated with 0.5 ng/mL biotinylated coating peptide diluted in assay buffer (25 mM TBS-BTB, 4 g/L NaCl, pH 7.4) and
• TMB tetramethylbenzinidine
• the inter- and intra-assay variation was determined by ten independent runs including eight quality control samples and two internal controls covering the detection range, with each run consisting of double-determinations of the samples.
• Five quality control samples consisted of: four human serum samples of which two where spiked with the synthetic specific peptide, and one sample of buffer spiked with the synthetic specific peptide.
• Intra-assay variation was calculated as the mean coefficient of variance (CV%) within plates and the inter-assay variation was calculated as the mean CV% between the ten individual runs. Two-fold dilutions of three human serum samples were used to calculate linearity. Recovery percentages were calculated with the un-diluted, 1:2 or 1:4 sample as a reference value.
• the lower limit of detection (LLOD) was determined from 21 measurements of the zero sample (assay buffer) and was calculated as the mean + three
• the upper limit of detection (ULOD) was determined from ten independent runs of the highest standard peptide concentration and was calculated as the mean back- calibration calculation + three standard deviations.
• the lower limit of quantification (LLOQ) was determined from three independent runs of a serum sample diluted stepwise and calculated as the highest LOXL2 level quantifiable in serum with a coefficient of variation below 30%.
• Analyte stability was first determined by the effect of repeated freeze/thaw of serum samples by measuring the LOXL2 level in three human serum samples in four freeze/thaw cycles. The freeze/thaw recovery was calculated with the zero cycle as reference.
• analyte stability was determined at different time points and temperatures by measuring LOXL2 level in three human serum samples after 0, 2, 4, 24 and 48 hours of storage at either 4°C or 20°C. Recovery was calculated with 0 hours as reference. Interference was determined by adding a
• lipemia/lipids (4.83/10.98 mM) and biotin (30/90 ng/mL) to a serum sample of known concentration. Recovery percentage was calculated with the normal serum sample as reference.
• Patient serum samples in cohort 1 included malignant melanoma, breast-, colon-, lung-, ovarian-, pancreatic-, prostate cancer and colonoscopy-negative controls.
• the cohort was obtained from the commercial vendors Proteogenex (Culver City, CA, USA) and Asterand Bioscience (Hertfordshire, UK) .
• Cohort 2 included serum samples from patients diagnosed with IPF (baseline samples, CTgov reg. NCT00786201) and healthy control serum samples acquired from the commercial vendor Valley Biomedical (Winchester, VA, USA) . Details of the studies are shown in table 1. All studies received suitable Institutional Review Board/Independent Ethical Committee approved sample collection including patients filed informed consent. Table 1. Overview of clinical and patients demographics of cohort 1 and 2. SD: Standard deviation. SCLC: small cell lung cancer; NSCLC: non-SCLC.
• the level of LOXL2 in serum samples was compared using one-way ANOVA adjusted for Tukey' s multiple comparisons test (parametric data), Kruskal-Wallis adjusted for Dunn's multiple comparisons test (non-parametric data) or unpaired, two-tailed Mann-Whitney test.
• the diagnostic power was investigated by the area under the receiver operating
• AUROC AUROC characteristics
• Sensitivity and specificity were determined for optimal cut-off values based on the ROC curves. P-values ⁇ 0.05 were considered significant.
• Graphs and statistical analyses were performed using GraphPad Prism version 6 (GraphPad Software, Inc., CA, USA) or and MedCalc Statistical Software version 12 (MedCalc Software, Ostend, Belgium) .
• the hybridoma clone producing monoclonal antibodies with the best native reactivity towards human serum samples and affinity towards the selection peptide was selected for ELISA optimization and validation.
• the specificity of the competitive LOXL2 ELISA assay was evaluated by analyzing the reactivity towards the target (selection) peptide, a non-sense peptide, an elongated peptide and using a non-sense biotinylated coating peptide; data are shown in Figure 1.
• the antibody reacted towards the selection peptide generating a standard curve following a five parametric curve. No detectable signal was observed using a non-sense biotinylated coating peptide, elongated peptide or non-sense peptide.
• the measuring range (LLOD to ULOD) of the assay was determined to 5.8-401.5 ng/mL and the lower limit of quantification (LLOQ) was 12.9 ng/mL.
• the intra- and inter-assay variation was 8% and 12%,
• the recommended human serum dilution was 1:2 and linearity was within +/-120%.
• the mean analyte recovery in three serum was 106% after 4 freeze/thaw cycles and after storage at 4°C for 2-48 hours the recovery was between 83-99% or at 20oC for 2-48 hours the recovery was between 84-97%.
• the acceptance criterion was a recovery within 100% ⁇ 20%.
• LOXL2 is elevated in patients with cancer and IPF
• the present invention provides a novel assay for the detection of an N-terminal neoepitope of human LOXL2.
• the assay was technically robust, with low limit of detection, acceptable intra- and inter-variation and linearity,
• the present invention provides a
• this assay may be a useful tool in the evaluation of novel anti-LOXL2 therapeutics.
• the word 'or' is used in the sense of an operator that returns a true value when either or both of the stated conditions is met, as opposed to the operator 'exclusive or' which requires that only one of the conditions is met.
• the word 'comprising' is used in the sense of 'including' rather than in to mean 'consisting of . All prior teachings
• Herlev Hovedgade 207 Herlev, Denmark; 2011;16:193-205.
• Lysyl oxidase-like 2 is critical to tumor microenvironment and metastatic niche formation in hepatocellular carcinoma.

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