EP1425306A2 - Nanoparticules comportant le facteur de necrose des tumeurs tnf a activite biologique, immobilise dessus - Google Patents

Nanoparticules comportant le facteur de necrose des tumeurs tnf a activite biologique, immobilise dessus

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Publication number
EP1425306A2
EP1425306A2 EP02797581A EP02797581A EP1425306A2 EP 1425306 A2 EP1425306 A2 EP 1425306A2 EP 02797581 A EP02797581 A EP 02797581A EP 02797581 A EP02797581 A EP 02797581A EP 1425306 A2 EP1425306 A2 EP 1425306A2
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EP
European Patent Office
Prior art keywords
tnf
group
protein
carrier
immobilized
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP02797581A
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German (de)
English (en)
Inventor
Günter Tovar
Thomas Schiestel
Herwig Brunner
Klaus Pfizenmaier
Matthias Grell
Peter Scheurich
Angela Hammer
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Publication of EP1425306A2 publication Critical patent/EP1425306A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y5/00—Nanobiotechnology or nanomedicine, e.g. protein engineering or drug delivery
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • A61K38/17—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • A61K38/19—Cytokines; Lymphokines; Interferons
    • A61K38/191—Tumor necrosis factors [TNF], e.g. lymphotoxin [LT], i.e. TNF-beta
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—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
    • 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
    • A61K47/62—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 a protein, peptide or polyamino acid
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—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
    • 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
    • A61K47/69—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 conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit
    • A61K47/6921—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 conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit the form being a particulate, a powder, an adsorbate, a bead or a sphere
    • A61K47/6923—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 conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit the form being a particulate, a powder, an adsorbate, a bead or a sphere the form being an inorganic particle, e.g. ceramic particles, silica particles, ferrite or synsorb
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—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
    • 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
    • A61K47/69—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 conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit
    • A61K47/6921—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 conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit the form being a particulate, a powder, an adsorbate, a bead or a sphere
    • A61K47/6927—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 conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit the form being a particulate, a powder, an adsorbate, a bead or a sphere the form being a solid microparticle having no hollow or gas-filled cores
    • A61K47/6929—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 conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit the form being a particulate, a powder, an adsorbate, a bead or a sphere the form being a solid microparticle having no hollow or gas-filled cores the form being a nanoparticle, e.g. an immuno-nanoparticle
    • A61K47/6931—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 conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit the form being a particulate, a powder, an adsorbate, a bead or a sphere the form being a solid microparticle having no hollow or gas-filled cores the form being a nanoparticle, e.g. an immuno-nanoparticle the material constituting the nanoparticle being a polymer
    • A61K47/6933—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 conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit the form being a particulate, a powder, an adsorbate, a bead or a sphere the form being a solid microparticle having no hollow or gas-filled cores the form being a nanoparticle, e.g. an immuno-nanoparticle the material constituting the nanoparticle being a polymer the polymer being obtained by reactions only involving carbon to carbon, e.g. poly(meth)acrylate, polystyrene, polyvinylpyrrolidone or polyvinylalcohol
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00—Drugs for disorders of the cardiovascular system
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K17/00—Carrier-bound or immobilised peptides; Preparation thereof
    • C07K17/02—Peptides being immobilised on, or in, an organic carrier
    • C07K17/06—Peptides being immobilised on, or in, an organic carrier attached to the carrier via a bridging agent

Definitions

  • the present invention relates to nanoparticles with tumor necrosis factor (TNF) immobilized thereon, TNF being directed in the form of a trimer and immobilized on the support while maintaining its biological activity, methods for the directed immobilization of TNF on nanoparticles, and the use of the immobilized TNF comprising nanoparticles for the identification and / or isolation of TNF binding partners as well as for the identification and / or isolation of inhibitors of the interaction between TNF and its binding partners, the use of such nanoparticles for the production of a pharmaceutical composition, in particular for the therapy of tumors, and pharmaceutical and diagnostic compositions containing such nanoparticles.
  • TNF tumor necrosis factor
  • the tumor necrosis factor belongs to the class of cytokines, which are substances that are produced and secreted by a large number of cell types and which, as intercellular mediators, regulate a large number of cellular processes. Cytokines include, for example, lymphokines, interleukins, monokines and growth factors.
  • the tumor necrosis factor (TNF, also called TNF or cachectin) is the eponymous member of a large gene family of cytokines that are structurally homologous and have diverse, partially overlapping biological properties.
  • TNF lymphotoxin alpha
  • LT- ⁇ lymphotoxin alpha
  • FasL CD27L, CD30L , CD40L, TWEAK, OX40L, EDA, AITRL, VEGI, LIGHT, 4-1BBL, APRIL, BLYS, RANKL and TRAIL, for each of which one or more specific membrane receptors exist (Locksley et al, Cell, 104: 487-501, 2001 ).
  • TNF tumor necrosis factor
  • the molecules of the tumor necrosis factor (TNF) ligand family are involved in a large number of primarily immunoregulatory processes via their complementary receptors, which are grouped together as a TNF receptor family.
  • the members of the TNF ligand family are type II membrane proteins (Locksley et al, see above). Of these Membrane-like forms can, however, also derive soluble forms in many cases through specific proteolysis or alternative splicing. In some cases, the soluble and membrane-bound forms of members of the TNF ligand family can differ considerably in their bioactivity (Grell et al, Cell, 1995).
  • TNF lymphotoxin
  • LT- ⁇ lymphotoxin
  • TNF lymphotoxin
  • TNF a real secreted protein
  • This membrane TNF is a real transmembrane protein, which is in trimeric form and is biologically active. It could be shown that membrane TNF has a special spectrum of cellular effects that are not achieved by soluble TNF and also not by LT- ⁇ (Grell et al., Cell, 83 (1995), 793-802).
  • TNF TNF-binding protein
  • FasL TRAIL
  • CD40L FasL, TRAIL and CD40L
  • TNF is mainly formed by macrophages / monocytes, lymphocytes and mast cells and has an impact on inflammation, sepsis, lipid and protein metabolism, blood dung, angiogenesis, wound healing and immune defense and exerts cytotoxic or cytostatic effects on certain tumor cells.
  • Lymphotoxin- ⁇ also has a cytotoxic effect on some tumor cell lines. Relatively little is known about the molecular basis of the diverse TNF- ⁇ effects in vivo and in vitro. Analysis of the crystal structure of the recombinant, soluble TNF- ⁇ molecule has shown that this substance is an oligomeric protein which consists of three identical subunits, each of 17.5 kDA.
  • TNF- ⁇ -oligomers have to bind to the membrane receptors so that at least in physiological solutions some of the different biological activities of TNF- ⁇ can be induced. Although it has been shown that TNF- ⁇ occurs in solution as an oligomer, it has been found, however, that these non-covalently linked TNF- ⁇ oligomers are unstable and are converted into inactive forms. However, it is assumed that the structural changes of TNF- ⁇ also take place in vivo, since monomers and oligomers are found in varying proportions in the brain-spinal cord fluid of patients with meningitis.
  • TNF- ⁇ was originally identified as an endotoxin-induced factor that can induce tumor necrosis in mice.
  • the anti-tumor effect of TNF- ⁇ is not only due to the cytotoxic effects against Tu morzellen results, but also based on an activation of antitumor effector immune cells in the blood, for example macrophages, cytotoxic lymphocytes and neutrophils.
  • the anti-tumor effect of TNF- ⁇ is also based on a specific damage to tumor blood vessels.
  • TNF- ⁇ has very low stability and exerts pleiotropic effects in vivo
  • previous attempts to use TNF- ⁇ have not been successful. It has been shown that when TNF- ⁇ is administered, extremely severe systemic side effects such as fever and low blood pressure occur before therapeutically effective doses are reached.
  • TNF- ⁇ has very limited stability and exerts pleiotropic effects in vivo
  • biologically active proteins such as cytokines
  • biologically active proteins very often have poor stability and short half-lives.
  • the proteins are rapidly removed from the blood by the liver, kidneys and other organs, the clearance rate depending on the size of the molecules and the extent of proteolysis. Plasma proteases in particular cause the degradation of such proteins and cause the rapid loss of biological activity.
  • Hurst et al. Anal ⁇ Chem., 71 (1999), 4727-4733, describe the covalent surface modification of magnetic polymer particles with a size in the ⁇ m range with TNF antibodies, with which TNF can subsequently be fished from a complex solution. This procedure is used for sample preparation of MALDI-TOF-MS procedures.
  • the immobilization of a protein via an antibody is in principle a directional immobilization. However, such protein immobilization is very unstable with respect to covalent binding.
  • TNF is not covalently bound. TNF is then slowly released from the particles and is: only biologically active in dissolved form.
  • the present invention is therefore based on the technical problem of providing means and methods for immobilizing tumor necrosis factor (TNF) or another member of the TNF family on a support surface, TNF being immobilized in such a way that its prior to The immobilization of existing biological activities can also be maintained in the immobilized state, so that immobilized TNF can, for example, interact with its receptors and thus its biological activities can be induced.
  • TNF tumor necrosis factor
  • the immobilized TNF or another molecule of the same family should in particular have those biological properties that characteristic of the membrane-like form of the TNF molecule - or of the membrane-like one
  • TNF in the immobilized state should be usable both for in vitro investigations, for example with regard to its interactions with other cellular components, and as a medicament for the treatment of diseases, in particular tumor diseases, without the side effects known in the prior art occur.
  • no significant degradation of the carrier systems or of immobilized TNF should take place ' or, in the case of an in vivo application, the degradation should only take place after deployment the biological activity of immobilized TNF take place at a later date.
  • the present invention solves the technical problem on which it is based by providing nanoparticles comprising a support with a surface having functional groups 1A and at least one monomer of a protein of the TNF family, this at least one monomer having the functional groups 1A has binding complementary functional groups 2A and is connected to the functional groups 1A of the carrier via the functional groups 2A.
  • the invention therefore provides that via a bond between the first functional groups 1A present on the support surface and functional groups 2A present in the monomer of the protein of the TNF family, which are complementary to the functional groups 1A and have an affinity with them , preferably covalent bond, can immobilize the monomer on the surface takes place.
  • the functional group 2A is preferably positioned within the monomer of the protein of the TNF family in such a way that it is arranged outside the domains responsible for the biological activity at a suitable distance from these domains, and thus to maintain the biological activity of the monomers or one Monomer complex ensured on the carrier.
  • the functional group 2A it can be provided that only one monomer is connected to the support in the manner shown and is thus immobilized.
  • it can also be provided that several, in particular three, monomers are each connected to the support via their functional groups 2A and, in a particularly preferred embodiment, are immobilized in the form of a trimer.
  • first monomer is connected via its functional groups 2A to the functional groups 1A of the support, but this first monomer is associated with at least one via, for example, a covalent or non-covalent bond further, for example two further monomers, is present in a biologically functional unit, for example in the form of a trimer.
  • this one or more further monomers are not directly covalently or non-covalently linked to the support, but are immobilized on the support solely by the interaction with the first monomer.
  • each of these monomers can therefore take place, on the one hand, by virtue of the fact that this monomer forms an affine, preferably covalent, bond directly via its functional groups 2A with the functional groups 1A of the support.
  • the immobilization can also be given by the fact that a monomer is associated with another monomer via a non-covalent or covalent bond, which in turn is linked via its functional groups 2A to the functional groups 1A of the support, so that the associated monomer does not bind directly to the support.
  • the invention also provides that each monomer has a Has bond both to the carrier and to another monomer.
  • each monomer unit carries a functional group which is suitable for a preferably covalent immobilization. It is preferred that each trimer is immobilized via three covalent bonds. However, it is also possible for only one or two covalent bonds to form between the TNF trimer and the particle and for the trimer to be stabilized by disulfide bridges between the monomers and / or non-covalent interactions.
  • bioactive heteromers for example LT- ⁇ LT-ß 2 or LT- ⁇ 2 LT-ß ⁇ , which again preferably have three or else one or two covalent bonds are immobilized.
  • the bioactivity of membrane-bound TNF is achieved, inter alia, by arranging several TNF trimers adjacent to one another on the cell surface.
  • corresponding receptors are bound and arranged in a complementary manner on the neighboring cell.
  • the corresponding signal response is only triggered when this receptor cluster has formed.
  • Precisely such a clustering and the associated signal cascade is triggered by the immobilization of the TNF on the particle surface, ie on the ß particles are TNF molecules immobilized on the particle surface in a favorable geometric density.
  • This density of the TNF immobilizates is achieved, inter alia, by attaching the functional groups 1 A and 1 B used for binding the TNF molecules in an appropriate density (this is demonstrated, for example, by zeta potential measurements, compare FIG. 12).
  • these monomers are monomers which are identical to one another, that is to say trimers formed from homomers are immobilized.
  • trimers formed from heteromers are immobilized.
  • a “protein of the TNF family” (TNF: tumor necrosis factor) is understood to mean the TNF molecule itself and all members of the proteins belonging to the TNF family, the specific activities in vivo and / or in vitro via appropriate receptors that are specific for the respective TNF family member, that is to say exercise complementary receptors, in particular TNF- ⁇ , LT- ⁇ and LT- ⁇ , FasL, TRAIL, CD40L, CD27L, CD30L, OX40L, EDA, AITRL , VEGI, LIGHT, TWEAK, 4-1BBL, APRIL, BLYS and RANKL.
  • TNF tumor necrosis factor
  • TNF protein of the TNF family ⁇ is used synonymously with the abbreviation TNF and vice versa, unless stated otherwise.
  • TNF is therefore a protein that has an in vivo influence on inflammation, sepsis, lipid and protein metabolism, blood formation, angiogenesis, wound healing and immune defense and in vitro and / or in vivo, among other things, cytotoxic (apoptosis and necrosis ) or cytostatic effects, but also influences cell proliferation and differentiation.
  • TNF is also a protein that is at least temporarily on a cell surface within a natural cell assembly and controls the communication of the cell with its environment.
  • TNF can come into contact with cells on the surface of which the complementary receptors (for example, for TNF of TNFRl and TNFR2, for TRAIL, TRAILR 1-4) are present and trigger TNF-specific signals and thus TNF-specific effects.
  • the complementary receptors for example, for TNF of TNFRl and TNFR2, for TRAIL, TRAILR 1-4
  • the present invention solves the technical problem on which it is based by providing nanoparticles comprising a support with a surface having functional groups 1A and TNF immobilized on the support with the functional groups 1A binding complementary functional groups 2A, with TNF immobilized in the form of a trimer.
  • the present invention provides nanoparticulate carrier systems, in particular nanoparticles, with TNF immobilized thereon, the immobilization being based on an affine binding of TNF to the nanoparticle surface.
  • the ' immobilization of TNF on the nanopar The particles are made according to the invention via a bond between the first functional groups 1A on the support surface and the functional groups Apen 2A in the TNF molecule, which are complementary to the functional groups 1A and can form an affine, preferably covalent, bond with them ,
  • the functional group 2A of TNF is preferably positioned within the TNF molecule in such a way that it is arranged outside the domains responsible for the biological TNF activity at a suitable distance from these domains. In this way, it is possible according to the invention to immobilize TNF in a directed manner and to retain the biological activities on the carrier.
  • TNF is fixed on the support surface according to the invention in such a way that the three-dimensional structure of the domain (s) required for the biological activity is not changed compared to non-immobilized TNF. and that the TNF domain (s) is / are freely accessible to them upon contact with cellular reactants.
  • TNF is fixed in the form of trimers. According to the invention, it is provided that the breakdown of TNF trimers is prevented by the introduction of certain protein elements, in particular those protein structures which naturally form firmly linked trimers. After such stabilization, it is then provided according to the invention that not every TNF subunit of a TNF trimer has affine bonds between the functional groups 1A and 2A on the surface of the nanoparticle. Carrier must be fixed, but it is sufficient if at least one TNF subunit of a trimer is bound to the carrier.
  • the carrier systems used according to the invention are compact or hollow nanoparticles with sizes between 5 and 500 nm. These consist of either organic or inorganic particle materials. According to the invention, the type of material can be varied in accordance with the later application, the carrier of the nanoparticles preferably consisting of biologically compatible and / or biodegradable materials.
  • the nanoparticles according to the invention on the surface of which TNF is fixed, behave like cells with respect to the immobilized TNF molecules.
  • the nanoparticles according to the invention can, for example, come into contact with cells on the surface of which one or more TNF receptors, for example TNFR1 and TNFR2, are present and can trigger TNF-specific signals and thus TNF-specific effects.
  • the nanoparticles are at least one dimension smaller than 1 ⁇ m, they are also referred to as “nanocytes” according to the invention.
  • the nanoparticles according to the invention react on the one hand in analogy to membrane-bound molecules, but on the other hand also develop completely new surprising functions, the nanocytes according to the invention have a very broad application potential.
  • the nanoparticles can be used as Tools for molecular biological, cell biological and clinical research are used.
  • the use of the nanoparticles according to the invention offers the advantage that established methods can be used for the determination of bioactivity and thus rapid material screening can be carried out.
  • the nanoparticles according to the invention can be used, for example, in vitro in order to investigate the mode of action of membrane-bound molecules, in particular in signal transduction. Compared to direct cell-cell interaction, the nanoparticles according to the invention have the advantage that individual effects can be investigated in isolation.
  • the nanoparticles according to the invention can therefore also be used for in vitro diagnostics, for example in order to recognize and / or label certain cells, in particular tumor cells.
  • cells can be brought into a desired state or there is the possibility of switching back and forth between different cell states.
  • the nanoparticles of the invention can also be used to particular cells from complex biological media or liquids, such as to isolate blood or trigger directly in these liquids or media in these cells appropriate reactions, such as tion differentiation, Prol 'iferation or apoptosis.
  • technical systems can also be constructed on the basis of the nanoparticles according to the invention that allow a targeted and continuous separation of certain cells.
  • the nanoparticles according to the invention in particular those with biologically compatible or biodegradable carrier systems, can be used in vivo for the therapy of various diseases. Using the erfindungsge 'Maessen nanoparticles all diseases can be piert therapy-in which the normal cell-cell interaction is disturbed, that particular tumor diseases, wound healing processes and similar principle. However, nanoparticles according to the invention can also be used for tasks that normally take over cells of the immune system.
  • the nanoparticles according to the invention in particular those based on biologically compatible or biodegradable carrier systems, can advantageously be applied directly in vivo.
  • the nanoparticles according to the invention can also be deposited in the form of porous films. Microporous systems have great potential for extracorporeal therapeutic applications, for example in the field of tumor therapy, in order to selectively detect freely circulating malignant cells and, if appropriate, to kill them.
  • a “protein” is understood to mean a molecule which comprises at least two amino acids connected to one another via an amide bond Oligopeptide, a polypeptide or a part thereof, for example a domain or a binding see, be.
  • the protein especially TNF, can be of natural or synthetic origin. It can contain ain and / or unnatural and / or unusual amino acids modified by genetic engineering methods compared to the wild-type protein.
  • a protein, in particular a TNF molecule can be derivatized compared to the wild-type form, for example have glycosylations, it can be shortened, it can be fused with other proteins or it can be linked to molecules of another type, for example carbohydrates.
  • nanoparticles are understood to mean binding matrices which comprise a support with a surface on which chemically reactive functional groups are arranged, which have affine bonds, that is to say, with complementary functional groups of molecules to be bound, in particular TNF molecules covalent and / or non-covalent bonds, and thus fix the molecules stably on their surfaces
  • the supports of the nanoparticles consist of chemically inert inorganic or organic materials and have a size of less than 1 ⁇ m, preferably from 5 to 500 nm.
  • a “first functional group 1A” is understood to mean a chemical group that is applied to the surface of the nanoparticle carrier and that is capable of having a complementary functional group 2A that is, for example, on the TNF to be immobilized -Molecule is present to interact in such a way that an affine, preferably covalent Bond between the two binding partners can take place.
  • the first functional group is 1 A of Provisionober- surfactant selected from the group consisting nooeuvre from amino group, carboxyl group, epoxy group, doadmi Maleinimi-, alkyl ketone, Aldehydgru 'ppe, zinoli hydrazine, hydrazide group, thiol group and thionyl oester group.
  • the functional groups 2A of the TNF molecules to be immobilized are selected from a group which contains the same species as for the functional group 1A of the carrier surface.
  • the surface of a nanoparticle according to the invention thus has a first functional group 1A, which is covalently linked to a functional group 2A of the TNF molecule to be immobilized, the functional surface group 1A being a different group than the t. functional protein group 2 A is.
  • the two groups 1 A and 2 A which are bonded to one another must be complementary to one another, that is to say be able to form a covalent bond with one another.
  • the functional group 2A of the protein to be immobilized is a carboxy group.
  • a carboxy group is used as the functional surface group 1A
  • the functional complementary protein group 2A is according to the invention an amino group.
  • a thiol group is selected as the functional surface group 1A
  • the complementary protein group is a maleimido group according to the invention.
  • the complementary functional protein group 2A according to the invention is a thiol group.
  • the functional complementary protein group 2A is a hydrazine or hydrazide group.
  • the functional complementary protein group 2A is, according to the invention, an alkyl ketone, in particular methyl ketone or aldehyde group.
  • the functional group 1A on the carrier surface of the nanoparticle is particularly preferably a maleimido group and the functional group 2A of TNF is a thiol group.
  • TNF is directed as a trimer and is immobilized on the surface of the nanoparticles according to the invention while maintaining its biological activity.
  • immobilized TNF is synthetic, naturally occurring or recombinantly produced TNF with a wild-type sequence or with an imitated sequence. According to the invention it is also possible that TNF is chemically modified.
  • the term “directionally immobilized” or “directional immobilization” means that a molecule, in particular TNF, is immobilized on a support at defined positions within the TNF molecule in such a way that the three-dimensional structure of the for the biological activity required TNF domain (s) is not changed compared to the non-immobilized state and that this TNF domain (s), for example binding pockets for cellular reaction partners, is / are freely accessible to them upon contact with cellular reaction partners , "Directionally immobilized” also means that TNF is fixed on the support surface in such a way that the immobilized protein cannot or only very slowly be degraded by protein-degrading enzymes when it is later used in a cellular or cell-like environment. This means that the immobilized TNF molecule is oriented on the carrier surface in such a way that it offers as few points of attack for proteases as possible.
  • TNF in particular the TNF trimer
  • TNF after immobilization on the surface of a nanoparticle can perform the same or almost the same biological functions to at least a similar extent as the same TNF molecules in the non-immobilized state under suitable conditions in vitro conditions or the same TNF molecules in their natural cellular environment.
  • trimer or “TNF trimer” is understood to mean a compound which is formed by linking three subunits, in particular three TNF monomers, the linking of the monomers to one another preferably being effected by disulfide bridging between cysteine residues ,
  • the trimerization of TNF leads to a stabilization of the molecules compared to the TNF monomer.
  • the three TNF subunits linked to form a trimer can be identical TNF monomers, ie the trimer can be present as a homotrimer. According to the invention, however, the trimer can also comprise different TNF monomers, which can differ both in terms of their composition, for example amino acid sequence, and in terms of their length.
  • the immobilized TNF trimer not every TNF subunit has to be bound to the surface of the nanoparticle support.
  • the TNF trimer can also be fixed to nanoparticles by only one TNF subunit of the trimer being fixed to the support via a covalent bond between its functional group 2A and the functional group 1A.
  • trimer formation occurs spontaneously either before or during immobilization by high-affinity binding of a non-covalent type, but also in particular by covalent disulfide bridging between cysteine residues.
  • the TNF molecules to be immobilized contain a natural or synthetically produced multimerization module which trimerizes TNF by high-affinity binding of a non-covalent type, but in particular by forming covalent disulfide bridges, and thus regular and stable trimerization of TNF.
  • the Tenascin C multimerization module is particularly preferably introduced into the TNF molecules to be immobilized by genetic engineering or using chemical synthesis methods. The TNF molecules modified in this way are then trimerized either before or during immobilization on the nanoparticles according to the invention.
  • the surface of the nanoparticle according to the invention has further functional groups 1 B and TNF which has complementary groups 2 B which bind ( functional groups 1 B), the functional groups 1 B and 2 B according to the invention in particular can enter into a non-covalent bond.
  • a “second functional group 1 B” is understood to mean a chemical group that is capable of interacting with a complementary functional group 2 B that is present in a TNF molecule to be immobilized interact so that a non-covalent bond can take place between the two binding partners.
  • the second functional group 1B of the support surface is selected from the group consisting of oligohistidine group, Strep-Day I, Strep-Day II, desthiobiotin, biotin, chitin, chitin derivatives, chitin-binding domain, metal ion chelate complex, streptavidin, streptactin, Avidin and neutravidin.
  • the functional group 2 B of the TNF molecule to be immobilized is selected from a group which contains the same species as for the functional group 1 B of the support surface.
  • the surface of a nanoparticle according to the invention thus has a functional group 1 B which is non-covalently linked to a functional group 2 B of TNF, the functional surface group 1 B being a different group than the functional TNF group 2 B ,
  • the two groups which are in non-covalent bond with one another must be complementary to one another, that is to say be able to form a non-covalent bond with one another.
  • the functional complementary TNF group 2 B is an oligohistidine group. If an oligohistidine group is used as the functional surface group 1 B, the functional complementary TNF group 2 B is a metal chelate complex.
  • Strep Day I Strep Day II
  • Biotin or Desthiobiotin is used as the functional surface group 1 B
  • the complementary functional TNF- Group 2 B streptavidin, streptactin, avidin or neutravidin are used. If streptavidin, streptactin, avidin or neutravidin is used as the functional surface group 1 B.
  • strep day I strep day II, biotin or desthiobiotin is used as the complementary functional TNF group.
  • chitin or a chitin derivative is used as the functional surface group 1 B
  • a chitin-binding domain is used as the functional complementary TNF group 2 B.
  • a chitin binding domain is used as the functional surface group 1 B
  • chitin or a chitin derivative is used as the functional complementary TNF group 2 B.
  • the above-mentioned functional groups of the support surface and / or of TNF are preferably connected to the TNF molecule or the support surface to be immobilized by means of a spacer or are introduced onto the support or into the TNF molecule using a spacer.
  • the spacer thus serves on the one hand as a spacer between the functional groups and the carrier or the TNF molecule, and on the other hand also as a carrier for the functional group.
  • such a spacer can be an alkylene or ethylene glycol spacer with 2 to 50 C atoms, which is substituted in a preferred embodiment and has heteroatoms.
  • the spacer can be flexible and / or linear.
  • the spacer When using a spacer in connection with the first functional group 1A of the surface, the spacer binds covalently a side chain of an amino acid of TNF, where the amino acid to which the binding occurs can be a natural or unnatural amino acid. If the amino acid is a natural amino acid, it becomes an unnatural amino acid in the sense of the invention by binding to the spacer and the associated functional first surface group 1A.
  • the spacer connects a functional TNF group 2A with a support, this is preferably done via an anchor group arranged on the support, which is preferably designed as a silane with reactive groups, for example with SiO groups on the surface of the preferably oxidized see Si carrier can form covalent Si-O-Si bonds (silox bonds).
  • an anchor group arranged on the support, which is preferably designed as a silane with reactive groups, for example with SiO groups on the surface of the preferably oxidized see Si carrier can form covalent Si-O-Si bonds (silox bonds).
  • the spacer either connects a functional group of the support surface with TNF or a functional group of the protein with the support, the functional group also being able to be regarded as a component of the spacer, that is to say one of its functional groups.
  • the first functional surface group 1A is the amino group, carboxy group, epoxy group, maleimido group, alkyl ketone group, aldehyde group, hydrazine group, hydrazide group, thiol group or thioester group, which are used by means of a spacer, for example in the case an alkyl ketone group using levulinic acid, with a Side chain of a natural or unnatural amino acid present in the TNF molecule to be immobilized are connected or introduced into the TNF molecule through the spacer. If the connection to a natural amino acid takes place, this becomes an unnatural amino acid by binding with the spacer having the functional group.
  • a “carrier” is understood to mean a chemically inert substance which serves as a framework for the TNF molecule to be immobilized.
  • the carrier consists of a biologically compatible material.
  • the carrier a compact or hollow particle with a size of 5 nm to 500 nm.
  • biologically compatible means that the carrier or the surface of the nanoparticle both in terms of its material composition and in terms of its structure neither in the body of a recipient nor in isolated biological tissues or fluids does it cause an immunological, toxic or other reaction and does not or hardly disrupt cellular or molecular processes.
  • a biocompatible carrier is “biodegradable”, this means that a carrier in the body of a recipient or in biological tissues or liquids can be slowly broken down or metabolized, preferably after the TNF molecule immobilized on the carrier has its biological activity has unfolded, the products of degradation or metabolism not causing any immunological, toxic or other reactions and moreover being readily absorbable in the body of the recipient.
  • the carrier of the nanoparticle according to the invention contains or consists of a biologically compatible, preferably an inorganic or an organic material.
  • the nanoparticle according to the invention consists of an inorganic carrier material such as silicon, Si0 2 , SiO, a silicate, Al 2 0 3 , Si0 2 -Al 2 0 3 , Zr0 2 , Fe 2 0 3 , Ag 2 0, Zr 2 0 3 , Ta 2 0 5 , zeolite, Ti0 2 , glass, indium tin oxide, hydroxylapatite, calcium phosphate, calcium carbonate, Au, Fe 3 0 4 , ZnS, CdSe or a mixture thereof.
  • An organic, biologically compatible carrier material can be substances such as polypropylene, polystyrene, polyacrylates or a mixture thereof.
  • the carrier of the nanoparticle according to the invention consists of or contains a biodegradable material.
  • the biodegradable materials must be stable for the period of use, but can then be broken down so that separable fragments are obtained.
  • these are polyesters of polylactic acid, which have been additionally stabilized by crosslinking and are therefore biodegradable in a controlled manner.
  • a polyester of polylactic acid in particular poly (D, L-lactic acid-co-glycolic acid) (PLGA).
  • the carriers of the nanoparticles according to the invention can be produced using conventional processes known in the art, such as sol-gel synthesis processes, emulsion polymerization, suspension polymerization.
  • the surfaces of the nanoparticle carrier are formed by chemical modification reactions with specific functional groups. These functional groups have a chemical reactivity which is suitable for reacting with specific functional groups introduced into TNF molecules. TNF is bound both covalently and non-covalently via a chemical reaction between the TNF and the surface.
  • the carriers, in particular their surfaces, are therefore provided with suitable functional groups 1 A or functional groups 1 A and 1 B after they have been produced using customary processes, for example graft polymerization, silanization, chemical derivatization, etc.
  • the density of the functional groups and the distance between these groups can be optimized.
  • the surroundings of the functional groups can also be prepared for the most efficient, directed immobilization.
  • the inorganic carrier for example in the form of quartz, silica, diatomaceous earth, Silica gel and / or Si0 2 powder present silanized carrier before applying the functional groups 1 A and 1 B, preferably after prior hydrophilization.
  • the number of functional groups 1 A and 1 B of the surface can be varied by adding diluent silanes in the preferably provided silanization.
  • diluent silane is understood to mean an organosilane which carries biochemically inert functional groups and which, moreover, is not able to bind a spacer which carries the functional surface groups.
  • the diluent silane is preferably used in order to reduce the non-specific binding of proteins to the surface of the support in addition to the dilution effect.
  • the diluent silane has 2 to 20 alkylene groups starting from the silane head group, which are preferably followed by 2 to 6 oxoethylene groups and are terminated by, for example, a hydroxyl group or methyl ether group.
  • the thinner silanes on the support surface promote the self-assembly effect by means of the corresponding alkyl chain length.
  • these diluent silanes which are used in the silanization of the carrier, prevent the unspecific adsorption of proteins on the nanoparticle surface by added corresponding functional units, such as, for example, oligoethyl lenglycol units.
  • corresponding functional units such as, for example, oligoethyl lenglycol units.
  • other chemical compounds can also be used, provided they have a protein-repellent effect on their non-specific binding behavior.
  • the nanoparticles in particular the surface, have additional functionalities.
  • the support can in particular have fluorescent markings, UV / Vis markings, superparamagnetic functions, ferromagnetic functions and / or radioactive markings. Due to the functionalities used according to the invention, appropriately equipped nanoparticles can be easily detected and / or isolated using suitable devices.
  • the surface of the nanoparticle carrier can also have additional chemical compounds. These additional chemical functionalities apply. among other things after the later use of the nanocytes according to the invention. If these are to be used, for example, for the therapy and / or diagnosis of diseases, the nanoparticles can contain suitable chemical compounds with a therapeutic and / or diagnostic effect. In a particularly preferred embodiment it is provided that the nanoparticles according to the invention additionally contain medicinal substances such as cytostatics. Accordingly, they are particularly suitable for the therapy of tumor diseases. According to the invention, however, it can also be provided that the functionalization of the carrier takes place using one or more chemical compounds which are used for steric stabilization and / or
  • A serves to prevent a change in the conformation of immobilized TNF and / or to prevent the attachment of a further biologically active compound to the carrier. It is particularly preferred according to the invention that this chemical compound is a polyethylene glycol, an oligoethylene glycol, dextran or a mixture thereof.
  • the carrier can also contain other biological functions.
  • This further preferred embodiment carries ligands, for example peptides or proteins, on its surface which specifically bind selected tissues or cells.
  • the TNF molecule to be immobilized can be of natural or synthetic origin. It can also be modified from the wild-type protein by genetic engineering methods and / or contain unnatural and / or unusual amino acids.
  • the TNF molecule to be immobilized is produced by peptide-synthetic methods or by in vitro translation.
  • unnatural, preferably linker-spacer-bearing amino acids are specifically incorporated in the production, so that subsequently a directed TNF immobilization to the support, which is compatible with the preservation of the biological TNF activity, is possible.
  • the application of the principle of incorporation of unnatural amino acids also enables the targeted and selective incorporation of fluorophores or other markers on these unnatural amino acids.
  • these modifications can consist in that amino acids that occur naturally in the TNF molecule are replaced by unnatural amino acids, that is to say that a naturally occurring amino acid is removed in a certain position and an unnatural amino acid is inserted in the same place.
  • the insertion of an unnatural amino acid can be obtained by inserting a stop codon at the desired location, or carried out by using the use of a loaded with the corresponding unnatural amino acid suppressor tRN ⁇ and a thus carried out for in vitro translation approach.
  • Such unnatural amino acids are compounds which have an amino acid function and a radical R and are not defined by a naturally occurring genetic code, for example L- (6, 7-dimethyloxycoumaryl) alanine.
  • amino acids preferably have an alkyl ketone group or an aldehyde group, thioester group, thiol group, hydrazine group or hydrazide group.
  • These unnatural amino acids can be generated by genetic engineering or during chemical synthesis of TNF are inserted into the molecule, preferably together with a spacer or linker.
  • At least one amino acid is thus derivatized from TNF, in particular by introducing an alkyl ketone group, thiol group, aldehyde group, thioester group, hydrazine group and / or hydrazide group.
  • one of the preceding functions is connected via a spacer to the side chain of an unnatural or natural amino acid, or the spacer has such a function.
  • the spacer can be flexible or linear and, for example, have a chain length of 2 to 50 atoms.
  • the spacer is formed by alkylene groups which are optionally substituted and / or contain heteroatoms.
  • the spacer is formed by the binding of a side chain of an amino acid of TNF, for example lysine, to levulinic acid (4-oxopentanoic acid), a methyl ketone group being introduced at the same time and the spacer being accordingly formed from the side chain and levulinic acid.
  • TNF for example lysine
  • levulinic acid 4-oxopentanoic acid
  • a methyl ketone group being introduced at the same time and the spacer being accordingly formed from the side chain and levulinic acid.
  • the unnatural amino acid to be used already has an alkyl ketone group, aldehyde group, thiol group, thioester group, hydrazide group or hydrazine group, the aforementioned derivatization is no longer necessary. It can therefore be provided that a naturally occurring amino acid, for example lysine, to be modified, for example by derivatization of its side chain, in particular its primary amino group, with the carboxylic acid function of A levulinic acid. TNF molecules which have such a naturally occurring amino acid with unnatural derivatization are modified in the sense of the present teaching.
  • the modification of TNF takes place by introducing tags, that is to say markings, in particular at least three histidine residues, preferably oligohistidines, into the TNF molecule, preferably at the C-terminus or N-terminus, such
  • tags can also be arranged intramolecularly.
  • the surface of the carrier for example the silanized surface of the carrier, is provided with functional groups by applying metal chelate complexes. In this way, non-covalent binding of the metal chelate complexes to the oligohistidine residue of the TNF molecule to be immobilized is achieved.
  • the metal component of the metal chelate complex is a divalent metal cation, in particular nickel 2 "1" .
  • the form of the metal chelate complex is nickel-NTA (NTA: nitrilotriacetic acid), in particular a derivative thereof.
  • NTA nickel-NTA
  • the metal chelate complex, in particular Ni-NTA or a derivative thereof is bonded to the surface of the support, for example by means of a bond between a primary amino group of the NTA derivative and a surface-bonded epoxy group.
  • TNF is modified by adding at least one Strep day, for example Strep day I or Strep day II or biotin or desthiobiotin, to this, preferably at the C-terminus or N-terminus
  • a “strep tag” is also understood to mean functional and / or structural equivalents, provided that streptavidin and / or its equivalents can bind.
  • streptavidin therefore also covers the purposes of the present invention its functional and / or structural equivalents.
  • the surface of the carrier preferably an inorganic carrier, in particular the silanized surface of the carrier, is provided with streptactin, avidin, neutravidin or streptavidin.
  • the binding provided according to the invention between the TNF molecules to be immobilized and the surface of the carrier thus takes place through an affinity binding between, for example, strep tag and, for example, streptavidin. It is also possible that, for example, streptavidin on the TNF molecule and, for example, the strep tag as a functional group of the carrier. gers is provided. Of course, according to the invention it is also possible to carry out several of the modifications mentioned on the TNF molecule to be immobilized, for example an unnatural amino acid which contains oligohistidine and / or strep tags.
  • the invention therefore provides for TNF molecules modified with unnatural amino acids, natural but unnaturally derivatized amino acids, specific histidine and / or strep tags to be bound with surfaces that are complementarily reactive in such a way that a suitable binding of the TNF molecules and thus this is immobilized.
  • modified TNF molecules themselves are also the subject of the present invention.
  • bound TNF completely retains its biological functions.
  • the provided linkers or spacers between the carrier and TNF surface satisfy the steric requirements for immobilizing TNF while maintaining its activity.
  • the invention also enables the site-specific incorporation of reporter or marker groups, for example fluorophores, spin labels, gold particles for light scattering, etc., in positions which do not impair the functional properties of TNF.
  • reporter or marker groups for example fluorophores, spin labels, gold particles for light scattering, etc.
  • the immobilized and possibly also labeled TNF molecules are more stable against enzymatic or chemical degradation by maintaining their native conformation and retain their biological functions.
  • the biological activities that are based on protein-protein interaction are conveyed by the immobilized TNF molecules.
  • the TNF molecule is labeled with markers which allow its detection.
  • markers which allow its detection.
  • These can be, for example, fluorophores, spin labels, gold particles, radioactive markers or the like.
  • these markers for example the fluorophores, are able to show a specific change in the fluorescence emission when a binding partner to be detected in a test is bound to the bound TNF molecule.
  • the fluorophores can be inserted into the TNF to be immobilized using amino acids, in particular unnatural amino acids.
  • Fluorine markers suitable according to the invention are, for example, N-methyl-aza-tryptophan or coumarin derivatives, such as DCA (6, 7-dimethoxy-4-coumaryl) or NBD (N- ⁇ -7-nitro-benzofurazan-LN-diaminopropionic acid). According to the invention this can be done immobilizing TNF molecules can also be labeled with fluorophores that enable single-molecule detection, for example the fluorescent dyes CyDye (Ammersham Pharmacia Freiburg) or Alexa (Molecular Probes, Eugene, USA).
  • the detection according to the invention of surface-bound ligands of the immobilized TNF molecule can be carried out, for example, by matrix-assisted laser desorption / ionization mass spectrometry (MALDI-TOF).
  • MALDI-TOF matrix-assisted laser desorption / ionization mass spectrometry
  • the ace spectroscopic detection includes the identification and characterization of the bound ligands in situ as well as the spatially resolved analysis.
  • the detection of the surface-bound ligands can be done by fluorescence spectroscopy.
  • the binding of the ligand to the solid-phase ligand, ie TNF, immobilized according to the invention causes a change in the fluorescence properties of the fluorescence markers used according to the invention, which enables the binding events to be quantified.
  • the present invention thus also relates to methods for detecting an interaction of mobilized TNF with, for example, ligands such as receptors, functional or structural equivalents, analogs, agonists, antagonists or the like, in particular for the purpose of medical research and diagnostics, the nanoparticles according to the invention being used to identify the above-mentioned binding partners of immobilized TNF.
  • ligands such as receptors, functional or structural equivalents, analogs, agonists, antagonists or the like
  • the nanoparticles according to the invention being used to identify the above-mentioned binding partners of immobilized TNF.
  • appropriate nanoparticles with TNF immobilized thereon are brought into contact with a solution to be investigated which contains potential binding partners and an interaction or an inhibition of this interaction is demonstrated.
  • the aforementioned method thus also represents a method for identifying or screening potential binding partners, for example potential ligands, of the TNF immobilized according to the invention.
  • the invention likewise relates to methods for the quantitative isolation of substances which react, that is to say bind, with the TNF molecule immobilized according to the invention.
  • substances are, in particular, proteins.
  • the methods according to the invention and the nanoparticles according to the invention can also be used to identify substances which act, for example, as modulators, ie amplifiers, inducers or inhibitors for the, in particular physiological, interactions of TNF with other proteins.
  • Such inhibitors to be detected can be, for example, genetically modified, the body's own proteins, chemically synthesized compounds from substance libraries or other unknown substances that may have therapeutic benefits.
  • Interaction of the second reactant with the first Detect th reactants by a suitable detection method can be also preferably provided that the interaction of the second reactant with the first reactant ⁇ in the presence or ex entity is detected by suitable detection method of a potential modulator, for example, inducer or inhibitor and as potential inducers or inhibitors in their effectiveness, for example as Medicines that can be checked.
  • a potential modulator for example, inducer or inhibitor
  • potential inducers or inhibitors to be checked can come, for example, from substance libraries.
  • the inhibitor or the second reactant for example a protein, is a protein identified in genome sequencing projects.
  • the present invention thus also relates to methods for identifying and / or detecting a substance which interacts between immobilized.
  • the present invention also relates to methods for the directed immobilization of TNF on a
  • TNF activity the surface of an inorganic see or modified organic carrier by applying a first functional group 1A and optionally a second functional group IB and modified complementary functional groups 2A and optionally functional groups 2A having modified TNF molecules with the modified nanoparticle surface in such a way that a covalent bond between the functional groups 1 A and 2 A and, if necessary, a non-covalent bond between the groups 1 B and 2 B takes place in such a way that the protein binds to the nanoparticle while maintaining its biological activity.
  • the functional groups 1A and 2A are selected from the group consisting of amino group, carboxy group, epoxy group, maleimido group, alkyl ketone group, aldehyde group, hydrazine group, hydrazide group, thiol group and thioester group.
  • the functional groups 1 B and 2 B are selected according to the invention from the group consisting of oligohistidine group, Strep day I, Strep day II, desthiobiotin, biotin, chitin, chitin derivatives, chitin binding domain, metal ion chelate complex, streptavidin, streptactin, avidin and neutravidin.
  • the functional groups 1 A, 1 B, 2 A and / or 2 B can be connected to the carrier and / or protein using a spacer.
  • the functional groups 1A and 1B are applied to the carrier surface by means of graft polymerization, silanization or chemical derivatization.
  • the carrier can first be hydrophylized and then silanized.
  • the support surface is silanized, for example, with an organosilane, in particular SiR ⁇ R 2 R 3 R4, where R 1 to R 3 hydrolyzable groups such as alkoxy groups or halides, preferably chlorides, and R 4 is an organic radical which acts as a spacer with a first functional group 1 A or as a binding point for a spacer carrying the first functional group 1A.
  • R 4 is used as a binding site, for example as an epoxy group, for which the spacer having the functional group is designed, the functional groups are applied to the surface after the silanization, that is to say for example the maleimido group, etc ..
  • the density of the functional groups or the distance of the functional groups from the surface and thus the flexibility can be optimized if necessary.
  • the surroundings of the functional groups on the carrier surface are prepared for electrostatic and steric equipment for the most efficient, directed immobilization.
  • the carrier surfaces can also be equipped with molecules such as polyethylene glycols, oligoethylene glycols, dextrans and the like in order to prevent an undesired change in the conformation of the immobilized TNF molecules, which prevents the unspecific adsorption of other bio- to minimize logical connections and / or to sterically stabilize the carrier systems.
  • a coated surface of the nanoparticle carrier is immobilized, the appropriate protein modification being selected depending on the surface modification.
  • the TNF molecule to be immobilized is brought into contact with the modified surface under such conditions that degradation of the protein is minimized or prevented.
  • the invention provides for the nanoparticles according to the invention to be masked, if appropriate with the aid of a stealth method, in particular by packaging in, for example, liposomes, in order to achieve adequate biological circulation when the nanoparticles according to the invention are used later.
  • the nanoparticles with the TNF immobilized thereon on a membrane, the resulting film being mechanically and / or chemically stabilized by crosslinking.
  • the present invention also relates to the use of the nanoparticles according to the invention for the production of a pharmaceutical composition, in particular for tumor therapy.
  • a “pharmaceutical composition” is used to diagnose a see, therapeutic and / or prophylactic purposes understood mixture that contains natural or synthetically produced active ingredients in a form that can be easily administered to the patient. It is therefore provided according to the invention that the pharmaceutical composition to be produced contains the active substance, in particular TNF, in a form immobilized on a nanoparticle.
  • the pharmaceutical composition can be a solid or liquid mixture.
  • a pharmaceutical composition can optionally contain one or more pharmaceutical carriers and further additives such as stabilizers, thickeners, release agents, lubricants, colorants, odorants, flavorings, builders, emulsifiers or the like.
  • the present invention therefore also relates to a pharmaceutical composition which contains the nanoparticles according to the invention, ie does the TNF appear in immobilized form ? contains a nanoparticle according to the invention.
  • SEQ ID No. 1 shows the coding DNA sequence of a TNF fusion protein using the example of CysHisTNF (construct 1) with nucleotides 1 to 546;
  • SEQ ID No. 2 shows the translated amino acid sequence of amino acids 1 to 181 derived from SEQ ID No. 1;
  • SEQ ID No. 3 shows the coding DNA sequence of a TNF fusion protein using the example of TNC-TNF (construct 2) with nucleotides 1 to 705, and
  • SEQ ID No. 4 shows the translated amino acid sequence derived from SEQ ID No. 3 with amino acids 1 to 234.
  • Figure 1 shows the results of a bioassay with the target cell KYM-1.
  • FIG. 1 shows the results of electrophoresis.
  • FIG. 3 shows the results of a further bioassay with the target cell KYM-1.
  • FIG. 4 shows the results of a bioassay, the effect of nanoparticles according to the invention on KYM-1 tumor cells compared to that of soluble human recombinant TNF as a control being investigated.
  • FIG. 5 shows the results of a bioassay, the effect of nanoparticles according to the invention on Co-Io205 tumor cells compared to that of soluble human recombinant TNF as a control being investigated.
  • Controls were with soluble human TNF with or without coincubation with the monoclonal agent antibody 80M2, which itself has no agonistic activity.
  • FIG. 6 shows the results of a further bioassay with the target cell KYM-1, the effect of the nanoparticles according to the invention compared to that of soluble human recombinant TNF as a positive control and nanoparticles not loaded with TNF as a negative control being investigated.
  • FIG. 7 shows the results of a further bioassay with mouse fibroblasts which express human TNFR2 and are therefore a cell model for recording bioactivity similar to membrane TNF.
  • the figure shows the properties of the TNF nanocytes (conjugate) comparable to the natural membrane TNF in comparison to positive (80M2 plus TNF) and negative (hu-TNF, 80M2, unloaded particles) controls.
  • FIG. 8 shows the results of waveguide spectroscopy resonance analyzes, in which the modified tumor necrosis factor receptor 1 (TNFRl-Fc) was immobilized on a carboxymethyldextran matrix (CMD matrix) via ⁇ -amino groups and binding studies were then carried out with CyHISTNF.
  • CMD matrix carboxymethyldextran matrix
  • the plotting of the association rate constant (kon) against the CysHisTNF concentration is another method of determining the K D value and is used to determine the K D value determined.
  • the intersection of the straight line with the Y axis corresponds to the half-life t ⁇ / 2 of the ligand-receptor complex and is therefore a measure of the stability of the CysHisTNF-receptor complex.
  • FIG. 9 shows the results of waveguide spectroscopy resonance analyzes, the modified tumor necrosis factor receptor 2 (TNFR2-Fc) being immobilized on a CMD matrix via ⁇ -amino groups and then binding studies carried out using CyHISTNF.
  • the plot of the extent of binding of CysHisTNF (extent) against the concentration used (ligate) results in a binding curve that describes the maximum possible binding in the saturation range (Bmax).
  • Bmax maximum possible binding in the saturation range
  • the intersection of the straight line with the Y axis corresponds to the half-life t ⁇ 2 of the ligand-receptor complex and is ? thus a measure of the stability of the CysHisTNF-receptor complex.
  • FIG. 10 shows the results of waveguide spectroscopy resonance analyzes, the modified tumor necrosis factor receptor 1 (TNFRl-Fc) being immobilized on a CMD matrix via ⁇ -amino groups and then binding studies with TNF carried out.
  • the plot of the amount of TNF binding (extent) against the concentration used (ligate) results in a binding curve that describes the maximum possible binding in the saturation range (Bmax).
  • Bmax the maximum possible binding in the saturation range
  • the intersection of the straight line with the Y axis corresponds to the half-life t ⁇ 2 of the ligand-receptor complex and is thus a measure of the stability of the TNF-receptor complex.
  • FIG. 11 shows the result of Ase from waveguide spectroscopy resonance analyzes, the modified tumor necrosis factor receptor 2 (TNFR2-Fc) being immobilized on a CMD matrix via ⁇ -amino groups and then binding studies with TNF carried out.
  • the plot of the amount of TNF binding (extent) against the concentration used (ligate) results in a binding curve that describes the maximum possible binding in the saturation range (Bmax).
  • Bmax the maximum possible binding in the saturation range
  • the intersection of the straight line with the Y axis corresponds to the half-life t ⁇ 2 of the ligand-receptor complex and is thus a measure of the stability of the TNF-receptor complex.
  • FIG. 12 shows the results of zeta potential studies.
  • Magnetic iron oxide carriers 200 ml of a 1 M FeCl 3 solution and 5 ml of a 2 M FeS0 4 solution in 2 M HCl were added to 250 ml of a 0.7 M NH 3 solution with vigorous stirring. The mixture was then stirred for 30 minutes and the black solid formed was washed with 200 ml of water. The precipitate was stirred for 30 minutes with 100 ml of 2 M HN0 3 and washed ⁇ three times with 100 ml of water. The superparamagnetic iron oxide carriers were resuspended in 50 ml of a 0.1 M tetramethylammonium hydroxide solution. This gave 2 g of iron oxide particles with an average particle size of 10 nm.
  • Example 1.2 50 mg of the magnetic iron oxide particles obtained in Example 1.2 were washed twice with 5 ml of ethanol and then taken up in 200 ml of ethanol. 12 mmol of tetraethoxysilane and 90 mmol of NH 3 were added to the solution. The mixture was then stirred at room temperature for 24 hours. The particles were then cleaned by multiple centrifugation. 600 mg of magnetic composite particles with an average particle size of 150 nm were obtained.
  • a 1% by weight aqueous suspension of the supports obtained in Examples 1.1 to 1.4 was mixed with 10% by volume of 25% ammonia. 20% by weight of amino pro pyltriethoxysilane, based on the carrier, was added and the mixture was stirred at room temperature for one hour. The particles were cleaned by repeated centrifugation. The particles obtained have functional amino groups on their surface (zeta potential in 0.1 M acetate buffer: +35 mV).
  • the Siliea particles obtained carry functional carboxy groups (zeta potential in 0.1 M acetate buffer: -25 mV) on their surface and have an average particle size of 160 nM.
  • This dextran surface is particularly suitable for the immobilization of proteins whose tertiary structure is disturbed by adsorption processes on the carrier surface.
  • a 1 M ethylenediamine solution in 0.1 M MES buffer pH 5.0 was prepared.
  • 500 ⁇ g of the carboxy- (dextran) -modified carrier and 30 ⁇ l of a 500 ⁇ mol / ml EDC solution in MES buffer were added. Then three hours was shaken at room temperature '. The carriers were then washed several times with MES buffer. Carriers with an average particle size of 160 nm and a zeta potential of + 25 mV in 0.1 M acetate buffer.
  • amines can also be used in an analogous manner, for example 4, 7, 10-trioxa-l, 13-tridecanediamine (or higher homologs) or tris (2-aminoethyl) amine.
  • NTA Nitrilotriacetic acid
  • amino-functionalized particles e.g. 2.1, 2.2, 2.5
  • 10 mM phosphate buffer pH: 7.0
  • heterofunctional polyethylene glycols such as mPEG-succinimidyl-propionate, t-Boc-NH-PEG-succinimidyl-propionate, maleinimido-PEG-succinimidyl-propionate or mixtures thereof
  • protective groups are present on the surface, they are removed by treatment with 1% trifluoroacetic acid for 2 hours.
  • the particles are washed twice with 1 ml of 10 mM phosphate buffer (pH: 7.0).
  • This surface is particularly suitable for the immobilization of proteins via disulfide bridges.
  • Example 2.3 the concentration of succinic anhydride is reduced.
  • the isoelectric point of the carrier system varies within a wide range, for example between 8 and 3, by a suitable choice of the NH 2 / COOH ratio. This is a crucial parameter for controlling the reactivity when reacting with proteins, since systems with the same charge repel each other ,
  • the first graph shows the implementation of unmodified silica particles with aminosilanes (analogous to example 2.1.).
  • these amino-functionalized surfaces are implemented with succinic anhydride (analogous to example 2.3.).
  • the resulting carboxy groups on the particle surface can be further reacted, for example, with ethylenediamine, as can be seen in graph 3 (analogously to example 2.5.).
  • the zeta potential and thus the density of the functional groups on the particle surface can be controlled by varying the modifier concentration.
  • the reaction is carried out as in Examples 2.6 or 2.7, but using a mixture of the two modifiers.
  • His-tag-bearing proteins are aligned non-covalently in a first step, this state then being permanently fixed by forming a covalent disulfide bridge.
  • the surface-modified nanoparticles produced above were used to immobilize TNF molecules.
  • the TNF molecules were coupled to the inert carriers in a directional manner while maintaining their signaling ability, so that when the nanoparticles were used, an interaction with a TNF receptor was possible and the signal response of the cell was measurable in defined cell systems.
  • the linker-modified fusion protein CysHisTNF was constructed, which has a reactive thiol group near the N-terminus, .. which, for example, can form a covalent bond with a maleimido group on the surface of nanoparticles.
  • the protein was additionally provided with a Gly-rich linker with a His tag consisting of two or more histidine residues, whereby the protein can be bound to an affinity matrix loaded with Ni 2+ and eluted with imidazole.
  • the His tag allows non-covalent binding of CysHisTNF to metal ion chelate complexes, in particular nickel-nitrilotriacetic acid (NTA) groups on the surface of nanoparticles.
  • NTA nickel-nitrilotriacetic acid
  • the functional protein was cloned using standard methods, for example using methods for site-specific mutagenesis, and is detailed below.
  • the DNA sequence is shown in SEQ ID No. 1 with nucleotides 1 to 546.
  • the associated amino acid sequence with amino acids 1 to 181 is shown in SEQ ID No. 2.
  • the structure from the N-terminus to the C-terminus is as follows:
  • linker 1 poly-Gly linker with a Cys (NT 25-27, AA 9) and a His tag (NT 43-60, AA 15-20): NT 1-78, AA 1-26
  • TNF module mature form of the human TNF protein (17.5 kDa form, recombinant TNF, Swissprot # P01375, AA 1-157) with deletion of the N-terminal 2 AA (TNF delta a 1 , 2 ): NT 79-543, AA 27-181
  • CysHisTNF This fusion protein (abbreviated: CysHisTNF) was produced as follows:
  • the TNF fragment (AA 3-181) was cut out from another PinPointHisTNF construct (prokaryotic vector PinPoint TM Xa-3, described in "PinPoint TM Xa Protein Purification System", Promega) by restriction digestion of the plasmid DNA with SacI and HindIII The fragment isolated after preparative agarose gel electrophoresis and DNA elution was inserted into a modified vector (pQE 5, QIAexpress®, Qiagen) which had been previously digested with BamHI and HindIII.
  • PinPointHisTNF construct prokaryotic vector PinPoint TM Xa-3, described in "PinPoint TM Xa Protein Purification System", Promega
  • the construct was sequenced to verify the cDNA sequence. '
  • the construct obtained in this way allows prokaryotic expression of the fusion protein CysHisTNF. This was largely carried out according to the manufacturer's instructions (QIAexpress® System, Qiagen). IPTG was not added to induce expression (basal induction).
  • the bacterial lysate (cytoplasmic extract) was used for the enrichment.
  • the TNF protein was purified by means of affinity chromatography (IMAC, HiTrap® affinity column, Amershampharmacia biotech). According to the manufacturer, the protein was bound to an affinity matrix loaded with Ni 2+ and eluted with imidazole.
  • FIG. 1 shows the result of the investigation with regard to the induction of apoptosis on TNF-sensitive tumor cell lines.
  • the figure shows that the TNF fusion protein CysHisTNF has a high bioactivity.
  • FIG. 1 shows cells of the human rhabdomyosarcoma line KYM-1. These were cultivated at 37 ° C, as in Grell et al., 1995 and Grell et al. , 1994. For the bioassay, 1 ⁇ 10 4 cells / well were sown in 96-well microtiter plates and incubated under culture conditions overnight.
  • the cells were then cultured for 16-20 h in the presence of titrated concentrations of human recombinant TNF- ⁇ (A) or CysHisTNF [bacterial lysate ( ⁇ ), purified protein (T)] and the metabolic cell activity via an MTT test quantified (Grell et al., 1995).
  • the absorbance was determined at 550 nm. The mean values from a typical experiment + SD are shown.
  • a fusion protein with the multimerization domain from the tenascin C molecule was constructed.
  • the multimerization domain from this molecule allows targeted covalent trimerization of the TNF fusion protein and contains at the N- Terminus two cysteine residues.
  • This fusion protein was cloned by standard methods, as described in detail below (Example 2).
  • the DNA sequence is in SEQ ID No. 3 with the
  • the associated amino acid sequence with amino acids 1 to 234 is shown in SEQ ID No. 4.
  • TNF-module mutated form of ⁇ - natural TNF precursor protein human (26 kDa membrane form, Swissprot # P01375, 233 AA) with 'Delet, ions of the N-terminal 56 AA and of AA 78-89 (TNF de ⁇ ta 56, 78- 89), ie deletion of the cytoplasmic domain, the transmembrane domain and the TACE cleavage site of the TNF precursor peptide: NT 133-627, AA 45-209
  • fusion protein was expressed, inter alia, in prokaryotic cells, in particular in E. coli, mammalian cells and in the baculovirus expression system. TNF fusion proteins can be functionally expressed in mammalian cells as described in
  • TNF-fusion protein TNC-TNF was also expressed prokaryotically.
  • TNF fusion protein with the multimerization domain from the Tenascin C molecule (AA 110-139, Swiss Prot. Accession No. P10039, chicken; or Swiss Prot. Accession No. P24821, human) (described in Wüest et al. , 2002, patent WO 02/22833).
  • This domain with a so-called "coiled-coil” structure allows targeted covalent trimerization of the TNF fusion protein and contains two cysteine residues at the N-terminal.
  • the exact position of the thiol groups within the protein sequence depends on the selected expression system (different linker sequences).
  • the TNC- TNF contains 2 cys at positions 10 and 12 (SEQ ID No. 3).
  • the TNC-TNF fragment (AA 9-234, see sequence 2) was derived from a construct / plasmid pGD105TNC-TNF (eukaryotic expression vector pGD105, described in EP 0 953 639) cut out and subcloned into a prokaryotic vector.
  • the plasmid DNA pGD105TNC-TNF was amplified by means of primers 1 and 2 and proof-reading PCR, as a result of which the interfaces Pst I and HindIII were introduced.
  • the sequence segment coding for the tenasc'in and the TNF domain was obtained by PstI / HindIII digestion.
  • the isolated fragment was inserted into the corresponding sites of the modified pQE-5 vector (Qiagen).
  • the vector pQE-5 was previously digested with PstI and HindIII.
  • Example 1 (Example 1) expressed. In deviation from this, the bacterial cells were cultivated at 30 ° C. (without induction of expression). In FIG. 2, the result of a gelelektrophoreti- separation rule according to the expression 'of TNF fusion protein is depicted. Western blot analysis shows that under non-reducing loading
  • the TNC-TNF is cleaned as described in 3.1.1.
  • FIG. 3 shows the result of the examination with regard to the induction of apoptosis on TNF-sensitive tumor cell lines.
  • the figure shows that the TNC-TNF has a high biological activity.
  • the KYM-1 cells (1.1 ⁇ 10 4 cells / well) were cultivated as described in FIG. 1.
  • the cells were incubated with serial dilutions of soluble human recombinant TNF- ⁇ (D) and TNC-TNF [bacterial lysate (•)] for 16 h at 37 ° C.
  • the proportion of living cells was quantified using an MTT test (see FIG. 1).
  • the absorbance was determined at 560 nm.
  • the mean values ⁇ SD are shown in each case.
  • TNF fusion proteins see 3.1.1 and 3.1.2
  • a maleimido-activated surface see Example 2.9
  • final concentration of the nanoparticles between 500 and 1000 ⁇ g / ml.
  • the two coupling components were mixed and for 30-45 min. incubated at room temperature in 2 ml of 10 mM sodium phosphate buffer pH 7.2 (final volume).
  • the particles were separated from the soluble component by centrifugation at 13,000 rp (Eppendorf cooling centrifuge 5403) for 10 min. at 4 ° C.
  • the carrier-immobilized TNF fusion protein was washed twice with 1-2 ml PBS and taken up in RPMI 1640 medium with a proportion of 5% FCS or PBS (depending on the further analyzes). '
  • TNF molecules were immobilized on the nanoparticles.
  • the nanoparticles obtained with TNF immobilized on them were characterized with regard to their biological activity using defined cellular test systems, in particular tumor cell lines. These cell systems enable sensitive detection a differential biological activity of soluble and nanoparticle-coupled TNF variants.
  • the cytotoxic effect of the nanoparticles A according to the invention with TNF immobilized thereon on KYM-1 cells, Colo205 cells and MF-R2Fas cells was recorded.
  • the effect of the nanoparticles according to the invention with TNF immobilized thereon was compared with the effect of human recombinant TNF- ⁇ in solution as a control.
  • the tests with regard to the effect of the nanoparticles and soluble TNF according to the invention on the cell lines mentioned above were carried out using standard methods.
  • the ECso values of immobilized and in solution TNF were determined and compared.
  • the KYM-1 cells were cultivated as described in FIG. 1.
  • the cells were incubated for 18 h at 37 ° C. in the presence of titrated concentrations of the conjugates from the coupling approaches A 1 - A 3 (carrier see 2.1).
  • the proportion of living cells was determined by the MTT method.
  • Human recombinant TNF- ⁇ ( ⁇ ) was used as the standard (see Fig. 1).
  • the loading of the particles with CysHisTNF was determined using a sandwich ELISA (OPTEIA TM Human TNF- ⁇ Elisa Kit, BD PharMingen).
  • Table 1 shows the EC o values for the TNF conjugates as compared to recombinant human TNF- ⁇ .
  • the bioassay to determine the effect of immobilized and non-immobilized TNF on the target cells Colo205 was carried out according to standard methods. Control approaches were carried out with soluble TNF with or without coincubation with the monoclonal antibody 80M2, which itself has no agonistic activity.
  • the Results relating to the effect of the nanoparticles according to the invention on these target cells in comparison with the effect of soluble human recombinant TNF on the target cell An Colo205 are summarized in FIG. 5 and Table 2.
  • the colon carcinoma cell line Colo205 was seeded in 96-well microtiter plates (1.1 ⁇ 10 4 cells / well) and incubated overnight, as described in Grell et al., 1995.
  • the Colo205 cells were serialized Dilutions of the conjugates from the coupling approaches A 1 - A 3 were incubated at 37 ° C. for 40 h.
  • Colo205 cells were additionally cultured with soluble human recombinant TNF- ⁇ (V) in the absence and presence of the TNF receptor R2-specific antibody 80M2 (0, ⁇ ; 1 ⁇ g / ml).
  • This onoclonal antibody itself has no agonistic activity, but together with soluble hu-TNF TNF receptor R2 induces specific signals (Grell et al., 1994).
  • the proportion of living cells was determined by the MTT standard method (cf. FIG. 1).
  • the loading of the particles with CysHisTNF was determined by means of a sandwich ELISA (cf. FIG. 4).
  • the Colo205 tumor cell line is largely resistant to the cytotoxic effect of soluble TNF, while stimulation of the TNF-R2 receptor with membrane-bound TNF, the so-called pro-form of TNF, as well as with immobilized TNF, leads to the induction of apoptosis.
  • the membrane-TNF equivalent properties of the TNF-conjugated nanoparticles (nanocytes) are confirmed in Example 4 in a further cell model.
  • the following figures further demonstrate the bioactivity mediated by conjugates / NANOCYTES on tumor cell lines.
  • surface-modified carriers were used which have a dextran layer '(CMD matrix, see 2.4).
  • the TNF receptor R2 stimulation was demonstrated via the induction of apoptosis (see FIGS. 6 + 7).
  • the specific biological activity / functionality of the conjugate was first determined in a standardized cytotoxicity test on KYM-1 cells (implementation see FIGS. 1 and 4).
  • the carriers described in 2.4 were used for the coupling approach.
  • Human recombinant TNF- ⁇ (D) was used as the standard.
  • Unloaded particles do not induce apoptosis (0).
  • the proportion of living cells was determined by the MTT standard method.
  • the loading of the particles with CysHisTNF (•) was quantified using a sandwich ELISA.
  • the biological activity of the conjugate described in FIG. 6 was determined in a further bioassay on mouse fibroblasts (1.2 ⁇ 10 4 cells / well) (FIG. 7).
  • This cell line expresses a TNF-R2-Fas chimeric TNF receptor, which expresses the cytoplasmic domain of the death receptor Fas (CD95) and the extra- contains the cellular domain of the human TNF receptor R2, as described in Krippner-Heidenreich et al., 2002.
  • the cell line is highly sensitive to the membrane form of hu-TNF-a [membrane equivalent
  • a stimulus (0) see Fig. 7], but largely resistant to soluble hu-TNF- ⁇ ( ⁇ ).
  • the proportion of living cells was determined by the crystal violet staining / method;
  • the loading of the particles with CysHisTNF (•) was determined by means of a sandwich ELISA (cf. FIG. 4).
  • TNFRl-Fc Modified tumor necrosis factor receptors 1
  • TNFR2-Fc tumor necrosis factor receptors 2
  • CMD matrix carboxymethyldextran matrix
  • Binding studies were then carried out. Different concentrations of TNF or Cys-TNF to the receptors were tracked online over time for binding. Regeneration occurred after each binding, that is to say the bound ligand was removed from the immobilized matrix. see. A receptor-loaded matrix was therefore available for at least 10 bonds. The following parameters could now be determined from the raw data obtained in this way:
  • the plotting of the association rate constant (kon) against the TNF or CysHisTNF concentration is another method of determining the K D value and is used to determine the K value determined under point 2.
  • the point of intersection of the straight line with the Y axis corresponds to the half-life t 2/2 of the ligand-receptor complex and is thus a measure of the stability of the TNF or CysHisTNF-receptor complex.
  • TNF-Selectokine a novel prodrug generated for tumor targeting and site-speeifie activation of tumor necrosis factor , Oncogene 21, 4257-4265 (2002)

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Abstract

L'invention concerne des nanoparticules comportant le facteur de nécrose des tumeurs (TNF) ou de la cytokine, immobilisé(e) dessus, le TNF ou la cytokine étant orienté(e) de préférence sous forme de trimère et étant immobilisé(e) sur le support, tout en conservant son activité biologique. L'invention concerne également des procédés d'immobilisation orientée de TNF ou de cytokine sur des nanoparticules, l'utilisation des nanoparticules présentant le TNF ou de la cytokine immobilisé(e), pour identifier et/ou isoler des partenaires de liaison de la cytokine ou du TNF, ainsi que pour identifier et/ou isoler des inhibiteurs de l'interaction entre le TNF ou la cytokine et ses partenaires de liaison, l'utilisation de ce type de nanoparticules pour produire une composition pharmaceutique, s'utilisant notamment dans le traitement de tumeurs, ainsi que des compositions pharmaceutiques et diagnostiques contenant ce type de nanoparticules.
EP02797581A 2001-08-31 2002-08-16 Nanoparticules comportant le facteur de necrose des tumeurs tnf a activite biologique, immobilise dessus Withdrawn EP1425306A2 (fr)

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DE10144252A DE10144252A1 (de) 2001-08-31 2001-08-31 Nanopartikel mit daran immobilisiertem biologisch aktivem TNF
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WO2003020320A2 (fr) 2003-03-13
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US20040265392A1 (en) 2004-12-30
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