WO1997035193A1 - Cryptic peptides and method for their identification - Google Patents
Cryptic peptides and method for their identification Download PDFInfo
- Publication number
- WO1997035193A1 WO1997035193A1 PCT/GB1997/000783 GB9700783W WO9735193A1 WO 1997035193 A1 WO1997035193 A1 WO 1997035193A1 GB 9700783 W GB9700783 W GB 9700783W WO 9735193 A1 WO9735193 A1 WO 9735193A1
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- WIPO (PCT)
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- peptide
- cells
- protein
- seq
- cryptic
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- C07K14/43513—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from invertebrates from arachnidae
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Definitions
- the present invention relates to immunologically cryptic peptides; methods for their identification in individuals and populations and their use in diagnosis and therapy of pathological conditions such as asthma and allergy, and their use in screening for therapeutic activity.
- T-cell antigen recognition requires antigen presenting cells (APCs) to present antigen fragments (peptides) on their cell surface in association with molecules of the major histocompatibility complex (MHC). T cells use their antigen specific receptors (TCRs) to recognise the antigen fragments presented by the APC.
- APCs antigen presenting cells
- MHC major histocompatibility complex
- TCRs antigen specific receptors
- a critical number of TCRs In order to trigger an individual T cell, a critical number of TCRs must be ligated by the peptide/MHC complex presented by the APC.
- a peptide which reaches the surface of the APC in sufficient numbers to do this can be termed "dominant” or "sub- dominant” depending upon its ability to induce T cell activation relative to other triggering peptides.
- a given protein In the normal course of events i.e. physiologically, a given protein will generate more than one peptide which is capable of triggering a T cell response. The term "dominant” would then be applied to the peptide that induces the most potent or most frequent response.
- T cell peptide epitopes within a given protein sequence (for which T cells are specific), which do not reach the APC surface in sufficient numbers to induce a response.
- certain peptides are processed and presented to T-lymphocytes efficiently and therefore stimulate T-cell responses while others are poorly processed and presented to T-lymphocytes.
- these latter peptides are not present upon the APC surface in sufficient numbers to stimulate a potentially reactive T-lymphocyte, these peptides have been referred to as "cryptic peptide epitopes".
- Cryptic peptide epitopes are present both in proteins normally present in the body (self proteins) and in non-self (or foreign) proteins.
- T cells which have the capability of reacting with a cryptic epitope cannot be detected in an in vitro primary stimulation assay (that is, T cells freshly isolated from the blood do not exhibit demonstrable proliferation when cultured with the cryptic peptide).
- other peptides which are efficiently processed and presented to T-lymphocytes by APC, can stimulate a proliferative response in primary culture. These are the "dominant" and "sub- dominant" epitopes.
- atopic allergy is applied to a group of allergies characterised by high concentrations of immunoglobulin E (IgE). They include allergic asthma, hay fever, perennial allergic rhinitis, some forms of urticaria (hives) and eczema, allergic conjunctivitis and certain food allergies (particularly food anaphylaxis).
- IgE immunoglobulin E
- They include allergic asthma, hay fever, perennial allergic rhinitis, some forms of urticaria (hives) and eczema, allergic conjunctivitis and certain food allergies (particularly food anaphylaxis).
- the mechanisms of generation of the pathology of such atopic conditions involves not only the synthesis of antigen/allergen specific IgE but also the accompanying differentiation and growth of effector cells such as mast cells and eosinophils.
- Allergic IgE-mediated diseases are currently treated by desensitization procedures that involve the periodic injection of allergen components or extracts. Desensitization treatments may induce an IgG response that competes with IgE for allergen, or they may induce specific suppressor T cells that block the synthesis of IgE directed against allergen. This form of treatment is not always effective and poses the risk of provoking serious side effects, particularly general anaphylactic shock. This can be fatal unless recognised immediately and treated with adrenaline.
- a therapeutic treatment that would decrease or eliminate the unwanted allergic-immune response to a particular allergen, without altering the immune reactivity to other foreign antigens or triggering an allergic response itself would be of great benefit to allergic individuals.
- WO 92/11859 describes a method of reducing immune response to an allergen in which a non-allergen derived, non-stimulating peptide which binds to specific MHC class II molecules of APCs is used to inhibit T-cell response to particular allergens.
- WO 91/06571 purports to disclose peptides derived from human T-cell reactive feline protein which can be used in the diagnosis, treatment or prevention of cat allergy.
- WO 94/24281 relates to peptides and modified peptides of the major house dust mite allergens.
- the modified peptides have the intent of reducing the level of undesirable side effects associated with desensitizing therapies.
- cryptic peptides may play a role in the pathology of atopic conditions such as asthma or other allergic diseases.
- the present inventors have found a method for identifying cryptic peptides and have observed that individuals with asthma or other allergy-based pathologies have T- lymphocyte populations which can be stimulated in primary culture by cryptic epi t opes derived from the allergen which causes the relevant pathology.
- T- lymphocytes isolated from a healthy individual would not be expected to be stimulated in primary culture by a cryptic epitope.
- a self peptide normally cryptic to the immune system becomes recognised and elicits an immune response.
- a method of determining whether a peptide of a protein is a cryptic peptide which method includes the steps of: i) exposing T cells with the peptide in a primary challenge; ii) measuring the reactivity of T cells with the peptide in the primary challenge of Step i; iii) exposing pre-challenged T cells with the peptide in a secondary challenge, wherein the pre-challenged T cells are obtainable by exposing the T cells to the protein; and measuring the reactivity of the pre- challenged T cells with the peptide in the secondary challenge.
- the prechallenge allows expression of not only dominant and sub-dominant epitopes on the APC surface, but also of any cryptic determinants.
- the subsequent peptide rechallenge of these cells reveals T-cell reactivity to the dominant, sub-dominant and cryptic epitopes.
- Primary challenge with peptides will elicit responses from only the normally expressed dominant and sub-dominant epitopes.
- peptides recognised following whole antigen primary challenge followed by peptide secondary challenge, but not after peptide primary challenge alone are by definition, cryptic epitopes.
- the peptide is a cryptic peptide if T-cell reactivity is observable in the secondary challenge above but not in the primary challenge.
- PBMC peripheral blood mononuclear cells
- T cells which contain T cells
- a short period of time e.g. 3-7 days
- PBMC peripheral blood mononuclear cells
- proliferative responses will be seen to the peptides which T cells recognise in the normal course of events i.e. dominant and sub-dominant epitopes.
- PBMC are first cultured for 1-2 weeks with a high dose of the whole molecule (or a cocktail of all the peptides), potential T-cell epitopes dominant, sub- dominant and cryptic will then be detected by subsequent "secondary" challenge with the peptides.
- the pre-challenged cells are obtained by exposing the T cells to protein or by exposing the T cells to protein in bulk culture.
- the T cells may be obtained from a population comprising a number of individuals (e.g. > 20) or from a single individual. If they are obtained from a population then any peptide identified as cryptic in all healthy individuals may be considered to be cryptic within the population in general while use of T cells isolated from a single individual will identify only peptides which are cryptic (or not) in that individual and may not be cryptic in the population.
- the steps of the method above may be carried out in the sequence as described or in any alternative sequence known to the person skilled in the art to be suitable to obtain an essentially equivalent result.
- the protein from which the peptides are derived is chosen from the list comprising Fel di (the feline skin and salivary gland allergen of the domestic cat Felis domesticus - the amino acid sequence of which is disclosed in WO 91/06571), Der p I, Der p II, Der fl or Der fll (the major protein allergens from the house dust mite dermatophagoides - amino acid sequences disclosed in WO 94/24281) and allergens present in any of the following: grass, tree and weed (including ragweed) pollens; fungi and molds; foods e.g.
- stinging insects e.g. bee. wasp and hornet and the chironomidae (non-biting midges); spiders and mites; mammals such as dog, horse, rat, guinea pig, mice and gerbil; latex; biological detergent additives; drugs e.g. penicillins and other antibiotics and anaesthetic agents.
- insect protein from which the peptides may be derived is chosen from the list comprising: housefly, fruit fly, sheep blow fly, screw worm fly, grain weevel, silkworm, honeybee, non-biting midge larvae, bee moth larvae, mealworm, cockroach and larvae of Tenibrio molitor beetle. All these being insect allergens of particular relevance to allergic problems arising in the workplace.
- Particularly preferred peptides for use in the method of the invention include those shown in Figs. I , 2 and 3.
- the method may also use those shown in any one of Sequence I.D. Nos 25 to 56.
- the invention also encompasses the use of these peptides as cryptic peptides.
- a further aspect of the present invention is any peptide identified as being cryptic when screened by the method of the present invention.
- Peptides retaining the ability to bind to MHC class II molecules may have up to around 40, preferably 31 residues.
- useful peptides may comprise a sequence as shown in any one of Sequence I.D. Nos 2 to 10 and 12 to 56.
- a 14mer contiguous sequence forms part of a larger peptide, preferably one up to about 31 residues.
- the 14mer forms about 45% of the larger peptide (or polypeptide).
- sequence forms about 50% or more, more preferably about 60% or more, even more preferably about 70% or more, or about 80% or more of the larger peptide. In a specially preferred embodiment the sequence forms about 90% or about 95 % or more of the larger sequence.
- a peptide of the present invention preferably a cryptic peptide when screened by the method of the present invention for use as a medicament or as a diagnostic
- a method of preparing a medicament or diagnostic comprising mixing a peptide of the present invention, preferably a cryptic peptide when screened by the method of the present invention, with a suitable carrier, diluent or excipient; the formulations prepared from such uses and methods; a method of therapy and/or diagnosis practised on the human body using a peptide of the present invention, preferably
- the present invention provides a pharmaceutical formulation comprising a cryptic peptide together with one or more pharmaceutically acceptable carriers therefor and optionally one or more other therapeutic ingredients.
- the carrier(s) must be 'acceptable' in the sense of being compatible with the other ingredients of the formulation and not deleterious to the recipient thereof.
- the formulations include those suitable for oral (particularly inhaled), parenteral (including subcutaneous, transdermal, intradermal, intramuscular and intravenous and rectal) administration although the most suitable route may depend upon for example the condition and disorder of the recipient.
- the formulations may conveniently be presented in unit dosage form and may be prepared by any of the methods well known in the art of pharmacy. All methods include the step of bringing into association a compound of the present invention as herein defined or a pharmacologically acceptable salt or solvate thereof ("active ingredient”) with the carrier which constitutes one or more accessory ingredients.
- Formulations of the present invention suitable for oral administration may be presented as discrete units such as capsules, cachets or tablets each containing a predetermined amount of the active ingredient; as a powder or granules; as a solution or a suspension in an aqueous liquid or a non-aqueous liquid; or as an oil-in-water liquid emulsion or a water-in-oil liquid emulsion.
- the active ingredient may also be presented as a bolus, electuary or paste.
- Formulations for inhalation may be presented in any of the ways known to be effective e.g. metered does inhalers.
- Formulations for parenteral administration include aqueous and non-aqueous sterile injection solutions which may contain anti-oxidants, buffers, bacteriostats and solutes which render the formulation isotonic with the blood of the intended recipient; and aqueous and non-aqueous sterile suspensions which may include suspending agents and thickening agents.
- the formulations may be presented in unit-dose or multi-dose containers, for example sealed ampoules and vials, and may be stored in a freeze-dried (lyophilised) condition requiring only the addition of the sterile liquid carrier, for example, water-for-injection, immediately prior to use.
- Extemporaneous injection solutions and suspensions may be prepared from sterile powders, granules and tablets of the kind previously described.
- Formulations for rectal administration may be presented as a suppository with the usual carriers such as cocoa butter or polyethylene glycol.
- Preferred unit dosage formulations are those containing an effective dose, as hereinbelow recited, or an appropriate fraction thereof, of the active ingredient.
- the compounds of the invention may typically be administered orally or via injection at a dose of from 0.001 to 1 mg/kg per day.
- kits which comprise cryptic peptides of the present invention.
- Each kit consists of a microculture plate containing lyophilized peptides corresponding to the cryptic peptide(s) identified by the method of the invention.
- Each peptide may be present in a minimum of three wells (for statistical evaluation). More replicates may be used depending on the number of peptides to be screened.
- the use of lyophilized peptides allows the kit to be stored at room temperature for several months before use.
- peripheral blood mononuclear cells may be isolated from patient blood by standard methods. Approximately 20 ml of blood is required. PBMC is added to the wells of the microculture plate in a volume of 200 ⁇ l of culture medium containing 10 5 cells. After 6 days of culture in a humidified incubator at 37°C gased with 5 % C0 2 in air, an isotopic label such as 3 H-thymidine or, a non-isotopic label such as bromo-deoxyuridine is added to each well for a prescribed period (approx. 12-24 hours). Cell proliferation to the peptides present may be assayed in any suitable way, e.g. DNA synthetic analysis, liquid scintillation spectroscopy or colourimetrically.
- the measurement of cellular reactivity to peptide challenge according to the present invention is preferably carried out by measurement of cellular proliferation as discussed above. However such reactivity may also be measured by determination of other cellular responses &&_ assay for the release of soluble mediators such as cytokines and chemokines which may demonstrate a release profile indicative of allergic responses.
- Cryp t ic peptides of the present invention which are to be used in therapy may be subjec t to poin t mutation in order to avoid certain undesirable side effect of peptide immunotherapy and/or to improve their effects.
- Peptide immunotherapy involves the administration of peptides which will disable specific T cells. Data from the trial of Allervax Cat [J. Allergy Clin. Immunol. Jan 1996 Abstract 815] shows that in some patients, a late-phase response to the administered peptide occurs. This response is essentially an asthma attack and represents a serious side-effect of this kind of therapy. By use of "altered peptide ligands" the same therapeutic goals can be achieved i.e.
- a series of a point mutations may be made to residues in order to generate a panel of closely related peptides. These may be screened for there ability to a) bind to the appropriate MHC molecule with a similar affinity to the original peptide and b) anergise or kill T cells specific for the original peptide.
- Such altered or synthetic peptides are also encompassed within the present invention.
- Particularly preferred synthetic peptides include those shown in Figure 3. Such peptides may be used according to the present invention either individually or in any pairwise or multiple combination thereof.
- the pre-challenged T cells may be generated as described above or in one alternative they may be generated by exposure of the T cells to bulk culture or to multiple peptides derived from the protein of interest.
- the method for determining whether a peptide of a protein is a cryptic peptide may be carried out as follows. T cells are isolated from peripheral blood using established techniques (Cellular Immunology LabFax., P.J. Delves (Ed), 1994, Tissue and Cell Culture, Chapter 4, pp. 45. Blackwell Scientific Publications]. A proportion of the cells are cultured in vitro for 6- 12 days with the protein of interest.
- the rest of the cells are aliquoted into cultures and incubated with the peptide of interest derived from the protein. .
- a label is added to the culture which enables the quantity of DNA synthesis within the cultures to be quantified sometime later (e.g. 8- 16 hours later).
- the group of cells cultured for 6-12 days with whole protein are collected at the end of this culture and washed several times in culture medium. However, as these cells were cultured with whole protein first i.e. were "pre- challenged” the subsequent peptide challenges are referred to as "secondary" challenges. Subsequent analysis of quantities of DNA synthesis in secondary challenges will identify all peptides derived from the protein which can potentially be recognised by T cells within an individual.
- the primary cultures identify the peptides which are recognised by T-lymphocytes from individuals with disease or without disease and the secondary cultures identify all peptides to which T cells can react in individuals with disease or without disease.
- Epitopes which are cryptic at the population level will be recognised in primary culture by individuals with disease but not by individuals without disease.
- T cells according to the present invention may be taken to be any preparation of mononuclear cells obtained from one or more individuals containing T-lymphocytes at a purity sufficient to be able to detect reactivity in a peptide challenge. All technical processes described above may alternatively be carried out using another process known to the person skilled in the art to be able to achieve the desired purpose of that process.
- cryptic peptides in a compound screen for the identification of compounds possessing therapeutic activity particularly in respect of atopic conditions and more particulary in respect of asthma.
- the cryptic peptides are preferably those identified using the method of the present invention.
- a screening process for the identification of therapeutic compounds and a kit adapted to pu t such screening process into effect.
- the screening process of the present invention is preferably carried out in vitro, but may also be carried out in vivo.
- the screening process of the present invention may be carried out in vitro as follows. Isolated peripheral blood mononuclear cells or cultured T lymphocytes are cul t ured in vitro with concentrations of one or more cryptic peptides, preferably previously determined as being optimal for the induction of proliferative and/or other responses in these cells.
- compounds which are to be screened for their potential to diminish the proliferative response of these cells to the cryptic peptide are preferably added to cultures over a broad range of concentrations.
- the compound may be added to the cultures at 10-fold dilutions over the range 10 "12 M to 10 "2 M in order to identify the dose providing the largest diminution in the proliferative response of the cells.
- Cellular proliferation may be measured using any technique well known in the art, for example cells may be labelled with a compound such as tritiated thymidine which will enable quantification of DNA synthesis and thus cellular proliferation.
- Compounds capable of diminishing the cellular proliferation induced by the cryptic peptide may be identified as a therapeutic in respect of a medical condition associated with that cryptic peptide.
- the screening process comprises the administration preferably to a human mammal, of a cryptic peptide to induce a condition associated with that cryptic peptide and the administration, preferably subsequently, of a compound to be screened.
- a compound capable of diminishing symptoms associated with the induced condition may be identified as a therapeutic in respect of that condition.
- the screen whether in vitro or in vivo comprises the use of cryptic peptides associated with atopic conditions such as asthma and most preferably the use of one or more of the FCIP peptides identified herein.
- cryptic peptides associated with atopic conditions such as asthma and most preferably the use of one or more of the FCIP peptides identified herein.
- Figure 1 shows the native sequence of chain 1 of the major cat allergen Fel d I in single letter amino acid code; and nine peptides derived therefrom.
- Figure 2 shows the native sequence of chain 2 of the major cat allergen Fel d I in single letter amino acid code; and eleven peptides derived therefrom.
- Figure 3 shows three synthetic peptides derived from the sequence of
- FC1P The three peptides are collectively referred to as FC1P.
- Figure 4 shows the results of Example 2 in terms of levels of cellular proliferation (expressed as ⁇ cpm) in response to primary and secondary challenge of PBMCs with FC 1 P, as described of PBMCs in the Example.
- Figure 5 shows the results of Example 3 in terms of levels of cellular proliferation (expressed as ⁇ cpm) in response to primary challenge of PBMCs with FC1P, as described in the Example.
- Figure 6 shows the results of Example 4 in terms of the lung function of an asthmatic (expressed as FEV, in litres) over time, as a consequence of the factors described in the Example.
- Figure 7 shows the results of Example 5 in terms of inhibition of T cell proliferation (measured by tritiated thymidine incorporation) to FC1 P peptides by dexamethazone and fluticazone.
- the method for determining whether a peptide of a protein is a cryptic peptide may be carried out as follows.
- 1 - T cells are isolated from peripheral blood
- the cryptic peptides identified by this method are those stimulating T-cell reactivity in the secondary challenge but not in the primary challenge.
- EXAMPLE 2 Peripheral blood mononuclear cells were isolated by density gradient centrifugation. A proportion of the cells were challenged with peptides in primary culture and the remaining cells cultured for 10 days with lOO g/ml cat dander extrac t ( con t aining Fel d I). Subsequently, cells cultured with cat dander were collected , washed in culture medium and then cultured for a further three days with the three peptides (at a concentration of 36 ⁇ g/ml) which together constitute FCIP (as shown in the Figure 3 herein) and equal numbers of irradiated autologous feeder cells. Cellular proliferation ( expressed as ⁇ cpm) was quantified by measurement of incorporation of tri t ia t ed thymidine into newly synthesised DNA, and is illustrated in Figure 4.
- FC I P peptides 40 ⁇ g was injected intradermally into each forearm of a volunteer cat-allergic asthmatic. This induced an isolated la t e-phase as t hmatic reaction approximately three hours after administration of FC 1 P. Lung function (quantified as FEV,) fell and remained low over the next several hours. The drop in FEV, was reversed by the administration of ⁇ 2 agonist and inhaled corticosteroid at 8 hours. The results of this are shown diagrammatically in Figure 6.
- EXAMPLE 5 Freshly isolated T lymphocytes were cultured in vitro with concentrations of FC 1 P peptides, previously determined as being optimal for the induction of proliferative and/or other responses in these cells. To certain of the culture wells were added, the glucocorticosteroid Dexamethazone or fluticazone, these were added to cultures at dilutions of 10 ⁇ 6 M or 10 ⁇ 9 M. After culture, cells were labelled with tritiated thymidine to enable quantification of DNA synthesis and thus cellular proliferation. The results are shown in Figure 7.
- MOLECULE TYPE protein
- MOLECULE TYPE protein SEQUENCE DESCRI PTION : SEQ ID NO : 8 :
- MOLECULE TYPE protein
- MOLECULE TYPE protein
- MOLECULE TYPE protein (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 23:
Abstract
Description
Claims
Priority Applications (9)
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US09/142,885 US6737406B1 (en) | 1996-03-21 | 1997-03-20 | Cryptic peptides and method for their identification |
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AU20365/97A AU730198C (en) | 1996-03-21 | 1997-03-20 | Cryptic peptides and method for their identification |
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JPWO2002066979A1 (en) * | 2001-02-22 | 2004-06-24 | タカラバイオ株式会社 | Method for detecting antigen causing bronchial asthma |
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GB0020260D0 (en) | 2000-10-04 |
GB2352518B (en) | 2001-04-04 |
AU730198C (en) | 2002-03-14 |
GB0027373D0 (en) | 2000-12-27 |
EP1612555A1 (en) | 2006-01-04 |
JP2000508627A (en) | 2000-07-11 |
DE69733343D1 (en) | 2005-06-30 |
CA2247009A1 (en) | 1997-09-25 |
EP0888541B1 (en) | 2005-05-25 |
US6737406B1 (en) | 2004-05-18 |
ES2314515T3 (en) | 2009-03-16 |
EP0888541A1 (en) | 1999-01-07 |
GB2349463A (en) | 2000-11-01 |
JP4340329B2 (en) | 2009-10-07 |
DE69739062D1 (en) | 2008-12-04 |
ATE412175T1 (en) | 2008-11-15 |
CA2247009C (en) | 2009-08-04 |
AU2036597A (en) | 1997-10-10 |
DK1612555T3 (en) | 2009-02-09 |
ATE296444T1 (en) | 2005-06-15 |
GB9817461D0 (en) | 1998-10-07 |
AU730198B2 (en) | 2001-03-01 |
GB2326642A (en) | 1998-12-30 |
GB2352518A (en) | 2001-01-31 |
GB2349463B (en) | 2001-01-10 |
GB2326642B (en) | 2001-02-07 |
EP1612555B1 (en) | 2008-10-22 |
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