WO2008110912A1 - Régulation de fertilité chez des chevaux - Google Patents

Régulation de fertilité chez des chevaux Download PDF

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Publication number
WO2008110912A1
WO2008110912A1 PCT/IB2008/000606 IB2008000606W WO2008110912A1 WO 2008110912 A1 WO2008110912 A1 WO 2008110912A1 IB 2008000606 W IB2008000606 W IB 2008000606W WO 2008110912 A1 WO2008110912 A1 WO 2008110912A1
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WIPO (PCT)
Prior art keywords
lhrh
adjuvant
dextran
deae
conjugate
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PCT/IB2008/000606
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English (en)
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WO2008110912A8 (fr
Inventor
Gary J. Sibert
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Pfizer Inc.
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Publication of WO2008110912A1 publication Critical patent/WO2008110912A1/fr
Publication of WO2008110912A8 publication Critical patent/WO2008110912A8/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/0005—Vertebrate antigens
    • A61K39/0006—Contraceptive vaccins; Vaccines against sex hormones
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/39—Medicinal preparations containing antigens or antibodies characterised by the immunostimulating additives, e.g. chemical adjuvants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • A61P37/02—Immunomodulators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • A61P37/02—Immunomodulators
    • A61P37/04—Immunostimulants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/55—Medicinal preparations containing antigens or antibodies characterised by the host/recipient, e.g. newborn with maternal antibodies
    • A61K2039/552—Veterinary vaccine
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/555—Medicinal preparations containing antigens or antibodies characterised by a specific combination antigen/adjuvant
    • A61K2039/55511—Organic adjuvants
    • A61K2039/55577—Saponins; Quil A; QS21; ISCOMS
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/555—Medicinal preparations containing antigens or antibodies characterised by a specific combination antigen/adjuvant
    • A61K2039/55511—Organic adjuvants
    • A61K2039/55583—Polysaccharides

Definitions

  • the present invention relates generally to an adjuvant composition having high adjuvant properties and low reactogenicity.
  • the adjuvant composition of the present invention is useful where the development of reactogenicity following administration of an immunogenic composition is unacceptable, for example, but not limited to, administration of an LHRH composition as a prophylactic and/or therapeutic agent for the modification of fertility and behaviour patterns of domestic pets or livestock destined for consumption. Particular applicability to reversible immunocastration in mares is also demonstrated.
  • Adjuvants are included or added to vaccines and other immunogenic formulations to increase and in some cases direct the immune response ⁇ see reviews by Gupta, 1998, Cox and Coulter, 1992, Azuma, 1992 and Aguado et al, 1999). It will be appreciated that some adjuvants, for example the oil-in- water and water-in-oil emulsions, are widely considered as strong adjuvants as they stimulate high levels of antibody, but the reactogenicity of such adjuvants precludes their routine use in many animal species or in man.
  • the hypothalmic peptide hormone LHRH is a 10 amino acid peptide that by itself is non-immunogenic. Coupling of LHRH to carrier proteins, for example diphtheria toxoid or ovalbumin, provides the necessary T-cell help for an immune response to the LHRH hapten. For other large molecular weight and complex antigens, T cell help is usually provided by T-cell epitopes within the molecule itself.
  • saponin refers to a group of surface-active glycosides of plant origin composed of a hydrophilic region (usually several sugar chains) in association with a hydrophobic region of either steroid or triterpenoid structure.
  • saponin is available from a number of diverse sources, saponins with useful adjuvant activity have been derived from the South American tree Quillaja saponaria (Molina). Saponin from this source was used to isolate a "homogeneous" fraction denoted "Quil A" (Dalsgaard, 1974).
  • IscomsTM immunostimulating complexes
  • LHRH hypothalamic hormone luteinising hormone releasing hormone
  • GnRH hypothalamic hormone luteinising hormone releasing hormone
  • De-sexing (or neutering) operations are the most widely practised surgical procedures in veterinary medicine and livestock animal management.
  • a significant proportion of both sexes of domestic livestock and companion animals are routinely surgically de-sexed to prevent a variety of undesirable characteristics which accompany sexual maturity.
  • the traits include fighting, wandering, sexual behaviour, loss of condition, tumours of reproductive organs and pregnancy.
  • the present invention extends these observations to include that female horses may be administered immunocastration products of the invention, for the purpose of delay and control of fertility, but which effects are eventually, fully reversible, such that breeding schedules may be delayed or planned, which is particularly important with show horses and other valuable horses, but with essentially no risk that such a program of control, via the LHRH products of the invention, will be at risk of permanent immunocastration.
  • One aspect of the present invention relates to an adjuvant composition which comprises an ionic macromolecule component and a saponin component, particularly an immunostimulating complex component.
  • Such an adjuvant composition has been found to have high adjuvant activity combined with low reactogenicity.
  • the advantage of this combined adjuvant over other known adjuvants is that it possesses an unusual combination of properties including: a) an ability to elicit a very strong immune response to a range of antigens and b) to have at the same time very low reactogenicity or reactivity, c) the reactogenicity is lower than that of the more reactogenic component in the combination, and d) the adjuvant effect or immunostimulating effect is greater than that of either of the component adjuvants alone.
  • an adjuvant composition which comprises an ionic polysaccharide component and a saponin component, particularly an immuno-stimulating complex component.
  • an adjuvant composition which comprises an ionic polysaccharide component and a saponin component, particularly a protein-free immunostimulating complex component.
  • an immunogenic composition comprising an immunogen and an adjuvant composition, which adjuvant composition comprises an ionic macromolecule component and a saponin component, particularly an immunostimulating complex component.
  • an immunogenic composition comprising an immunogen and an adjuvant composition, which adjuvant composition comprises an ionic polysaccharide component and a saponin component, particularly an immunostimulating complex component.
  • an immunogenic composition comprising an immunogen and an adjuvant composition, which adjuvant composition comprises an ionic polysaccharide component and a saponin component, particularly a protein-free immunostimulating complex component.
  • composition comprising an immunogenic composition as broadly described above, together with one or more pharmaceutically acceptable carriers and/or diluents.
  • Another aspect of the present invention relates to a method of eliciting, in an animal, an effective immune response, said method comprising administering to said animal an effective amount of an immunogenic composition as broadly described above.
  • the present invention provides the use of an adjuvant composition as broadly described above in the manufacture of a composition for eliciting an effective immune response in an animal.
  • the invention provides further advantages in that temporary immunocastration can be effected in female horses (mares and fillies), which is fully reversible, and can be accomplished without long term risk to the fertility of valuable animals, such as show horses and racing horses, and breeding stock for such horses.
  • Figure 1 provides a report of estrus cycle status and outcomes for placebo controls
  • Figure 2 provides a report of estrus cycle status and outcomes using Equity product.
  • the present invention is predicated, in part, on the determination that when the ionic polysaccharide component of the vaccine comprising LHRH conjugated to diphtheria toxoid as disclosed in International Patent Application No. PCT/AU98/00532 is combined with an immunostimulating complex, the reactogenicity of the immunogenic composition is reduced without significant reduction in efficacy.
  • one preferred aspect of the present invention relates to an immunogenic composition for use in eliciting an effective immune response to LHRH, said composition comprising a LHRH-diphtheria toxoid conjugate and an adjuvant composition, which adjuvant composition comprises an ionic polysaccharide or other ionic macromolecule component and a saponin component, particularly an immunostimulating complex component.
  • reactogenicity to an immunogenic preparation is usually assessed by reference to the development of a number of symptoms including symptoms of inflammation such as swelling which is detectable either by palpation or, if more severe, by the eye, redness, and abscess formation.
  • the degree of reactogenicity is usually determined by reference to the occurrence, duration and severity of any one or more of these symptoms. For example, reactogenicity which results in visible abscess formation is of greater severity than reactogenicity which involves only swelling. Further, swelling which is visible to the eye is a more severe form of reactogenicity than swelling which is detectable only by palpation.
  • reactogenicity which is "low” should be understood as reactogenicity which produces either no detectable symptoms or symptoms which are not visible to the eye.
  • swelling which is detectable only by palpation is an example of reactogenicity which is low.
  • the present invention should be understood to extend to the complete absence of any reactogenicity.
  • low reactogenicity may also be taken to include visible swelling of only short duration.
  • references to an "ionic macromolecule” or an “ionic polysaccharide” should be understood as a reference to any positively or negatively charged polysaccharide or other macromolecule, or derivative or chemical equivalent thereof. Reference to “derivative” and “chemical equivalent” should be understood to have the same meaning as outlined below.
  • the polysaccharide or other macromolecule may be chemically modified to introduce charged groups, so that it becomes highly charged. In solid form or when in solution, the charged groups are paired with a counter ion so that the overall net charge is zero or close to zero.
  • the polysaccharide may be selected from any one of a number of such molecules, preferably soluble molecules to aid in sterilisation for example by filtration, but the polysaccharide is not restricted to soluble polysaccharides, as insoluble materials may be sterilised by irradiation, wet or dry heat or other processes that do not rely on solubility.
  • the polysaccharide is a polymer of glucose, linked alpha 1-6 to form a soluble dextran, although insoluble forms of dextran linked alpha 1-3 may also be used.
  • the polysaccharide or other macromolecule may be modified to give strong positive (+) charged groups at pH values between 5.0 and 8.0.
  • the modifying group can be selected from any one of a number of (+) charged groups, but preferably is a diethyl-aminoethyl (DEAE) group.
  • An alternative (+) charged polysaccharide is QAE-dextran.
  • the modified dextran known as DEAE-dextran may have a molecular size in the range 50,000 Da to 5x10 6 Da, preferably a molecular weight range of 500, 000 to 1.5XlO 6 Da.
  • dextran is heterogeneous in size, typically with 95% of the material within approximately a 4 fold size range.
  • the level of modification is high, such that on average every third glucose residue is substituted with a DEAE group.
  • Such material may be purchased commercially or manufactured from dextran.
  • the dextran or other polysaccharide may be negatively charged, for example by modification with sulphate groups.
  • the ionic polysaccharide component of the adjuvant composition of the present invention is a DEAE- dextran component.
  • the saponin component may, for example, be Quil A or another purified or semi-purified saponin preparation (including a mixture of saponin fractions).
  • the saponin component is provided in the form of an immunostimulating complex.
  • lmmunostimulating complexes or IscomTM
  • IscomTM which are incorporated in the adjuvant composition in accordance with the present invention may be prepared by techniques which are well known to persons skilled in the art, and which are described in detail in the publications of Cox and Coulter, 1992 and Morein et al., Australian Patent Specifications No. 558258, 589915, 590904 and 632067 the disclosures of which are incorporated herein by reference.
  • immunostimulating complexes are typically, but not limited to, small cage like structures 30-40 nM in diameter.
  • the final optimal formulation of an immunostimulating complex with protein is a molar ratio of Quil A, cholesterol, phosphatidyl choline and protein in a ratio of 5:1:1 :1.
  • An immunostimulating complex may contain, for example, 5 to 10% by weight Quil A, 1 to 5% cholesterol and phospholipids and the remainder protein.
  • Peptides can be incorporated into the immunostimulating complex either directly or by chemical coupling to a carrier protein ⁇ e.g. diphtheria toxiod or influenza envelope protein) after incorporation of protein into immunostimulating complexes.
  • references to an "immunostimulating complex” should be understood to include reference to derivatives, chemical equivalents and analogues thereof.
  • reference to a derivative of an immunostimulating complex includes reference to an immunostimulating complex in which one or more of Quil A, cholesterol, phosphatidyl choline or protein, for example, are deleted or where a component in addition to Quil A, cholesterol, phosphatidyl choline or protein is added to the complex.
  • the functional equivalent of an immunostimulating complex may be an immunostimulating complex in which one or more of its four -components are replaced with a functional equivalent.
  • the protein component of the immunostimulating complex is deleted. This type of immunostimulating complex is herein referred to as a "protein-free immunostimulating complex" (or IscomatrixTM).
  • the immunostimulating complex in the adjuvant composition of the present invention should be oppositely charged to the ionic polysaccharide component.
  • the immunostimulating complex is negatively charged. This desirable characteristic may be achieved by incorporation of charged saponins into the structure. Formation of an effective adjuvant composition by combining an immunostimulating complex with negatively charged polysaccharide component would require that the immunostimulating complex be positively charged. In an alternate form, a positively charged immunostimulating complex would be combined with a negatively charged ionic-polysaccharide component.
  • antigens or other immunogens may be combined with the novel adjuvant composition of the present invention, including soluble protein antigens, peptide hapten conjugated to a carrier protein and whole virus as antigen.
  • soluble protein antigens peptide hapten conjugated to a carrier protein and whole virus as antigen.
  • other antigens such as recombinant proteins, antigenic polysaccharides, antigenic lipids, peptides and other particulate antigens may also be suitably used with this adjuvant composition.
  • the final formulation is to be used to raise an immune response against the antigen of choice.
  • Both immunostimulating complexes loaded with antigen or protein-free immunostimulating complexes may be used to form the adjuvant composition.
  • the combination adjuvant may be formed with antigen first incorporated into the immunostimulating complex.
  • antigen may be added to the combination adjuvant after formulation of the adjuvant. This has many advantages in manufacture of vaccines, both experimentally and commercially, as the one form of adjuvant may be used for a wide range of antigens.
  • DEAE-dextran is known in the art to be a very strong adjuvant, but often with unacceptable reactogenicity. Immunostimulating complexes are known to be acceptable adjuvants on their own, but with a far lesser degree of immunostimulating activity when compared to DEAE-dextran. More specifically, the new adjuvant is a carefully controlled combination of DEAE- dextran and immunostimulating complex, the controlled ratio being that which maintains the adjuvant activity of both components, particularly of the more powerful adjuvant DEAE-dextran but also of immunostimulating complexes, but the combination is such that the unwanted reactogencicity of the DEAE- dextran is neutralised. In the art, it is expected that combinations of adjuvants will be more reactogenic than the individual components. Such is the case with DEAE-dextran combined with oil emulsions (Hodgkinson et al, 1990).
  • the mass ratios referred to herein relate to the preferred adjuvant composition
  • DEAE-dextran in which the dextran is substituted about every third glucose residue, and a protein-free immunostimulating complex having a Quil A:cholesterol:phospholipid ratio of 5:1 :1.
  • Formulations with a mass ratio in the range of 50 to 300 have been found to be effective, with a preferred range of 100 to 140.
  • a preferred formulation is one with a mass ratio of DEAE-dextran to immunostimulating complex of 125. This is exemplified by vaccines containing about 10 mg DEAE-dextran and about 80 micrograms immunostimulating complex for use in smaller or more sensitive animals such as dogs or man, or similarly about 100 mg DEAE-dextran with about 800 micrograms immunostimulating complex, or about 150mg DEAE-dextran with about 500 micrograms immunostimulating complex, for use in larger animals such as horses, cattle, sheep and pigs.
  • an "effective" immune response should be understood as a reference to an immune response which either directly or indirectly leads to a desired prophylactic or therapeutic effect.
  • the immunogen comprises a LHRH-diphtheria toxin conjugate
  • such a response includes the reduction or complete blocking of reproductive function (i.e. reduces or prevents the development of or functioning of any one or more of the reproductive organ's activities or modulates the hormonal levels of an animal such that any one or more aspects of reproduction or reproductive activity are reduced) in at least 90%, and preferably at least 95%, of animals treated.
  • efficacy is a functional measure and is not defined by reference to anti-LHRH antibody titre alone since the presence of circulating antibody alone is not necessarily indicative of the capacity of said circula ting antibody to block reproductive function.
  • the term "reproductive organ” should be understood in its broadest sense to refer to the male and female gonads and accessory sexual organs.
  • “Accessory sexual organs” should also be understood in its broadest sense and includes, for example, the prostate, breasts, seminal vesicles and the uterus.
  • LHRH LHRH
  • LHRH includes peptides comprising a sequence of amino acids substantially as set forth in SEQ ID NO:1 [p-Glu-His-Trp-Ser-Tyr-Gly-Leu-Arg- Pro-Gly] or SEQ ID NO:2 [His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly] or SEQ ID NO:3 [Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly] or SEQ ID NO:4, or having at teast 50% similarity to any thereof.
  • SEQ ID Nos: 1 , 2 and 3 are from the human and are conserved across all mammals.
  • SEQ ID NO:4 [ Gly-Ser-Gly-Ser-Gly-Leu-Arg-Pro-Gly] is a derivative of SEQ ID NO:2 wherein spacers have been introduced at the N-terminus.
  • Chemical equivalents of LHRH can act as a functional analogue of LHRH. Chemical equivalents may not necessarily be derived from LHRH but may share certain similarities. Alternatively, chemical equivalents may be specifically designed to mimic certain physiochemical properties of LHRH. Chemical equivalents may be chemically synthesised or may be detected following, for example, natural product screening.
  • LHRH Homologues of LHRH contemplated herein include, but are not limited to, LHRH derived from different phyla including birds, fish, reptiles and invertebrates.
  • “Derivatives” may also be derived from insertion, deletion or substitution of amino acids.
  • Amino acid insertional derivatives include amino and/or carboxylic terminal fusions as well as intrasequence insertions of single or multiple amino acids.
  • Insertional amino acids sequence variants are those in which one or more amino acid or non-natural amino acid residues are introduced into a predetermined site in the protein although random insertion is also possible with suitable screening of the resulting product.
  • Deletional variants are characterised by the removal of one or more amino acids from sequence.
  • Substitutional amino acid variants are those in which at least one residue in the sequence has been removed and a different natural or non- natural residue inserted in its place. Typical substitutions are those made in accordance with Table 1 :
  • non-natural amino acids include, but are not limited to the D-isomers of said amino acids. "Additions" to amino acid sequences indude fusion with other peptides, polypeptides or proteins.
  • diphtheria toxoid should be understood as a reference to all forms of diphtheria toxoid and derivatives thereof.
  • derivatives has the same meaning as hereinbefore defined. Derivatives may include, for example, molecules comprising the diphtheria toxoid T cell epitopes or said T cell epitopes in isolation.
  • said LHRH comprises an LHRH C-terminal fragment of at least five amino acids. More preferably, said LHRH is full length LHRH or "LHRH 1-10 form" which comprises the amino acid sequence substantially as set forth in SEQ ID NO:1. Even more preferably, said LHRH comprises the amino acid sequence substantially as set forth in SEQ ID NO:2 and wherein the carboxyl terminus of said amino acid sequence is amidated. Said preferred LHRH is referred to herein as "LHRH 2-10 form".
  • a composition for use in eliciting an effective immune response to LHRH comprising a LHRH 2-10 form-diphtheria toxoid conjugate and an adjuvant composition, which adjuvant composition comprises an ionic polysaccharide component (preferably a DEAE-dextran component) and a saponin component, particularly an immunostimulating complex component.
  • adjuvant composition comprises an ionic polysaccharide component (preferably a DEAE-dextran component) and a saponin component, particularly an immunostimulating complex component.
  • compositions for use in eliciting an effective immune response to LHRH comprising a LHRH 2-10 form-diphtheria toxoid conjugate and to an adjuvant composition, which adjuvant composition comprises an ionic polysaccharide component (preferably a DEAE-dextran component) and a saponin component, particularly a protein-free immunostimulating complex component.
  • adjuvant composition comprises an ionic polysaccharide component (preferably a DEAE-dextran component) and a saponin component, particularly a protein-free immunostimulating complex component.
  • the LHRH peptide may be synthesised by Fmoc chemistry and the resulting peptide coupled to the carrier protein diphtheria toxoid. Said coupling may be performed as described in Ladd et al 1990 or in Bonneau et al 1994, and the resulting conjugate of peptide and carrier protein (referred to herein as "peptide-conjugate") processed to be free of unbound peptide and other by-products of conjugation. Such processing may be achieved by conventional dialysis or by ultrafiltration. The resulting peptide-conjugate is adsorbed to the ionic polysaccharide adjuvant.
  • administering induces a significantly more effective immune response against LHRH than the LHRH-carrier-adjuvant compositions described in the prior art.
  • Said improved efficacy is observed when the immunogenic LHRH composition specifically comprises the carrier diphtheria-toxoid and an ionic polysaccharide adjuvant.
  • the reactogenicity of the LHRH-conjugate preparation can be reduced while maintaining its efficacy.
  • LHRH-conjugate preparations suitable for use in accordance with the present invention preferably comprise 5-500 micrograms of LHRH-diphtheria toxoid conjugate in 5-500 mg ionic polysaccharide (such as DEAE- dextran)/40-4000 micrograms immunostimulating complex (such as IscomatrixTM).
  • ionic polysaccharide such as DEAE- dextran
  • immunostimulating complex such as IscomatrixTM
  • compositions in accordance with the present invnetion may be administered by injection by any of the routes currently known in the art of vaccinology, e.g. by subcutaneous, intramuscular, intradermal injection or by oral administration, or by application to mucosal membranes, either by direct application in solution or gel or other suitable formulation, or by aerosol administration to the nasal or respiratory surfaces.
  • the formulation is administered by subcutaneous or intramuscular injection.
  • the formulation may be stored as a solid, frozen or dried, either by freeze drying or lyophilisation, or by spray drying or other forms of drying.
  • the pharmaceutical forms suitable for injectable use include sterile aqueous solutions (where water soluble) or dispersions and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersion. It must be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms such as bacteria and fungi.
  • the carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol and liquid polyethylene glycol, and the like), suitable mixtures thereof, and vegetable oils.
  • the proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the maintenance of the required particle size in the case of dispersion and by the use of surfactants.
  • the prevention of the action of microorganisms can be brought about by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, sorbic acid, thimerosal and the like.
  • isotonic agents for example, sugars or salts such as sodium chloride.
  • Prolonged absorption or delayed release of the injectable compositions can be brought about by the use in the compositions of agents delaying absorption, for example, aluminum monostearate and gelatin.
  • Sterile injectable solutions are prepared by incorporating the active compounds in the required amount in the appropriate solvent with various of the other ingredients enumerated above, as required, followed by filtered sterilization.
  • dispersions are prepared by incorporating the various sterilized active ingredients into a sterile vehicle which contains the basic dispersion medium and the required other ingredients from those enumerated above.
  • the preferred methods of preparation are vacuum drying, the freeze-drying technique and the spray-drying technique which yield a powder of the active ingredients plus any additional desired ingredient from previously sterile-filtered solution thereof.
  • the active ingredients When the active ingredients are suitably protected they may be orally administered, for example, with an inert diluent or with an assimilable edible carrier, or they may be enclosed in hard or soft shell gelatin capsule, or compressed into tablets, or incorporated directly with the food of the diet.
  • the active compound For oral administration, the active compound may be incorporated with excipients and used in the form of ingestible tablets, buccal tablets, troches, capsules, elixirs, suspensions, syrups, wafers, and the like.
  • the percentage of the compositions and preparations may, of course, be varied and may conveniently be between about 5 to about 80% of the weight of the unit. The amount of active compound in such useful compositions is such that a suitable dosage will be obtained.
  • the tablets, troches, pills, capsules and the like may also contain the components as listed hereafter: a binder such as gum, acacia, corn starch or gelatin; excipients such as dicalcium phosphate; a disintegrating agent such as corn starch, potato starch, alginic acid and the like; and a lubricant such as magnesium stearate.
  • a binder such as gum, acacia, corn starch or gelatin
  • excipients such as dicalcium phosphate
  • a disintegrating agent such as corn starch, potato starch, alginic acid and the like
  • a lubricant such as magnesium stearate.
  • the dosage unit form is a capsule, it may contain, in addition to materials of the above type, a liquid carrier. Various other materials may be present as coatings or to otherwise modify the physical form of the dosage unit.
  • a syrup or elixir may contain the active compound, methyl and propylparabens as preservatives,
  • Pharmaceutically acceptable carriers and/or diluents include any and all solvents, dispersion media, coatings, antibacterial and antifungal agents, isotonic and absorption delaying agents and the like.
  • the use of such media and agents for veterinarily active substances is well known in the art. Except insofar as any conventional media or agent is incompatible with the active ingredient, use thereof in the therapeutic compositions is contemplated. Supplementary active ingredients can also be incorporated into the compositions.
  • Dosage unit form refers to physically discrete units suited as unitary dosages for the subjects to be treated; each unit containing a predetermined quantity of active material calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier.
  • the specification for the novel dosage unit forms of the invention are dictated by and directly dependent on (a) the unique characteristics of the active material and the particular therapeutic effect to be achieved, and (b) the limitations inherent in the art of compounding such an active material for the treatment of disease in living subjects having a diseased condition in which bodily health is impaired as herein disclosed in detail.
  • the principal active ingredient is compounded for convenient and effective administration in effective amounts with a suitable pharmaceutically acceptable carrier in dosage unit form as hereinbefore disclosed.
  • a unit dosage form can, for example, contain the principal active compound in amounts ranging from 0.5 ⁇ g to about 2000 ⁇ g. Expressed in proportions, the active compound is generally present in from about 0.5 ⁇ g to about 2000 ⁇ g/ml of carrier.
  • the dosages are determined by reference to the usual dose and manner of administration of the said ingredients.
  • animal should be understood as the reference to all animals including primates (e.g. humans, monkeys), livestock animals (e.g. sheep, cows, horses, donkeys, goats, pigs), laboratory test animals (e.g. rats, guinea pigs, rabbits, hamsters), companion animals (e.g. dogs, cats), captive wild animals (e. g. emus, kangaroos, deer, foxes), aves (e.g. chickens, ducks, bantams, pheasants, emus, ostriches), reptiles (e.g. lizards, snakes, frogs) and fish (e.g. trout, salmon, tuna). Said animal may be male or female.
  • primates e.g. humans, monkeys
  • livestock animals e.g. sheep, cows, horses, donkeys, goats, pigs
  • laboratory test animals e.g. rats, guinea pigs, rabbits
  • the LHRH-conjugate is based on a synthetic 2-10 form of Luteinising Hormone Releasing Hormone (LHRH) peptide coupled to a carrier protein.
  • LHRH Hormone Releasing Hormone
  • the peptide by itself is too small to be antigenic, and coupling to a carrier protein is required so that the peptide acts as a hapten and immunity is induced to LHRH.
  • the carrier protein is diphtheria-toxoid.
  • the peptide is synthesised by Fmoc chemistry and the resulting 2-10 form LHRH peptide is coupled to diphtheria toxoid.
  • the coupling may be performed as described in Ladd et al. 1990 or in Bonneau et al. 1994, and the resulting conjugate of peptide and diphtheria-toxoid processed to be free of unbound peptide and other by-products of conjugation.
  • Such processing may be achieved by conventional dialysis or by ultrafiltration.
  • the resulting LHRH-carrier protein preparation may be used to prepare a composition for administration by formulation with or in an adjuvant.
  • the levels of active component and adjuvant are in part dependent on the species being targeted and are chosen to achieve the desired level and duration of the immune response required and on the lack of reactogenicity (ie tissue compatibility).
  • DEAE-dextran (Pharmacia, MW range 500,000 to 1 ,500,000) is simply prepared as a 20% w/v solution by first dissolution in water, the pH adjusted to 7.5 with NaOH, the volume adjusted to give the required concentration and then sterilised by filtration.
  • IscomatrixTM and DEAE-dextran plus antigen are then mixed in the appropriate ratios, followed by the addition of diluent to adjust the final volume to achieve the correct concentration of all of the components of the vaccine.
  • DEAE-dextran An appropriate volume of DEAE-dextran is first added to a sterile mixing vessel containing a suitable stirring device. For volumes less than 2 litres, a magnetic stirring bar is suitable. The appropriate volume of IscomatriXTM (-2 mg/mL) is then added, followed by the appropriate volumes of antigen and then diluent to bring the material to the correct volume.
  • the diluent of choice is of low ionic strength, to bring the whole final formulation to approximate isotonicity and thus avoid pain on injection due to hyper-tonicity or higher than physiological osmolarity. This is of particular importance in the art of vaccine formulation, as severe pain resulting from injection is highly undesirable and would render the whole formulation unsuitable.
  • the diluent found to be suitable for a canine vaccine is sterile water for injection, ie pyrogen free distilled water.
  • EXAMPLE 3 A. Preparation of vaccines for dog trials. a. DEAE-dextran adjuvant alone.
  • the formulation required to be tested in this trial was a 1mL dose containing 50 mg DEAE-dextran, 200 ⁇ g LHRH-diphtheria toxoid conjugate, with thiomersal (0.01 %) added as preservative, in sterile phosphate buffered saline.
  • the adjuvant for this vaccine is prepared by dissolving DEAE-dextran in distilled water and adjusting the pH to 7.5 with sodium hydroxide. The final concentration of the DEAE-dextran is adjusted to 20% w/v by the addition of distilled water, after pH adjustment. The solution is then sterile filtered. LHRH peptide (2-10 LHRH) is conjugated to diphtheria toxoid as described in Example 1. The conjugate preparation is sterile filtered and the protein concentration determined by standard methods, e.g. the BCA protein assay. The preparation used for this study was 5.7 mg protein/mL. b. IscomatrixTM adjuvant alone.
  • the formulation required to be tested in this trial was a 1mL dose containing 60 micrograms IscomatrixTM, 200 ⁇ g LHRH-diphtheria toxoid conjugate, with thiomersal (0.01 %) added as preservative in sterile phosphate buffered saline.
  • the adjuvant for this vaccine is prepared as described in Example 2A using Quil A as the saponin derivative, together with cholesterol, dipalmitoyl phosphatidyl choline (DPPC) and Mega 10 as the detergent. The process is performed under sterile conditions with all components sterilised prior to addition.
  • the Quil A concentration was determined to be 2. 24mg/ml.
  • LHRH peptide (2-10 LHRH) is conjugated to diphtheria toxoid as described in Example 1.
  • the conjugate preparation is sterile filtered and the protein concentration determined by standard methods, e.g. the BCA protein assay.
  • the preparation used for this study was 5.7 mg protein/mL. c.
  • IscomatrixTM + DEAE-dextran The formulation required to be tested in this trial was a 1 mL dose containing 60 ⁇ g IscomatrixTM +10 mg DEAE- dextran, 200 ⁇ g LHRH-diphtheria toxoid conjugate, with thiomersal (0.01%) added as preservative, in sterile phosphate buffered saline.
  • the adjuvant for this vaccine is a compound adjuvant, obtained by combining appropriate proportions of IscomatrixTM and DEAE-dextran.
  • IscomatrixTM is prepared as described in Example 2A.
  • DEAE-dextran is prepared as described in above.
  • LHRH peptide (2-10 LHRH) is conjugated to diphtheria toxoid as described in Example 1.
  • the conjugate preparation is sterile filtered and the protein concentration determined by standard methods, e.g. the BCA protein assay.
  • the preparation used for this study was 4.9 mg protein/mL.
  • Dogs of 6-12 months of age and of mixed sex were housed in indoor pens with free access to outdoor runs. They were fed a commercially available balanced diet.
  • Dogs (groups of 7) were vaccinated subcutaneously in the scruff of the neck at 0 and 4 weeks with a 1 mL dose of vaccine. All vaccines were administered from a 2 mL syringe fitted with a 23 gauge needle.
  • Dogs were bled at regular intervals to monitor antibody levels to LHRH.
  • Reactogenicity of the vaccines was determined by close examination of the dogs after vaccination.
  • Beagle foxhound cross dogs (groups of 8 or 13) were vaccinated with formulations of 2-10 LHRH linked to DT.
  • the active component was formulated in either DEAE-dextran alone, Iscomatrix alone or in the combination adjuvant DEAE-dextran plus Iscomatrix.
  • DEAE-dextran vaccines Each dose was contained in a volume of 1 mL formulated to contain either 10 mg or 50 mg of DEAE-dextran with 200 ⁇ g 2-10 LHRH-DT conjugate.
  • Iscomatrix Each dose was formulated in 1 mL with either €0 ⁇ g or 150 ⁇ g Iscomatrix with 200 ⁇ g 2-10 LHRH-DT conjugate.
  • Combination adjuvant Each dose was contained in a volume of 1 mL formulated to contain DEAE-dextran and Iscomatrix in the ratios indicated below with 200 ⁇ g 2-10 LHRH-DT conjugate.
  • the combination adjuvant contained either:
  • Site reactions were determined by careful palpation of the injection site and surrounding tissue at weekly intervals.
  • the site reaction data presented are at post boost (PB) vaccination. Reaction to vaccination may in certain circumstances be increased with continuing vaccination, and thus the reactogenicity post boost may be considered as more stringent test than post primary vaccination.
  • PB post boost
  • Volumes are calculated from the measured size of the local reaction determined by palpation, and are volumes are expressed in ml_. This measure gives a better indication of the severity of the site reactions.
  • the formulation containing 10mg DEAE-dextran to 80 micrograms Iscomatrix has significantly less reactivity than either DEAE- dextran alone or the 12. 5/60 formulation.
  • This formulation did not give visible reactions at any time after injection, and comparison of reaction volumes indicates that at all times after injection, the 10/80 formulation far fewer reactions and those few that do occur, with a peak of 3 of 13 dogs at 2 weeks post more acceptable and of shorter duration. This has a mass ratio of 125.
  • the immunostimulatory effectiveness of an adjuvant may be judged by the magnitude and duration of the antibody response elicited.
  • the antibody titres at 8 weeks post boost are shown below for the DEAE-dextran and combination adjuvants.
  • the titres in the above table show that the 10/80 vaccine (mass ratio 125) is a stronger immunostimulant than either the combination adjuvant 12. 5/60 vaccine (mass ratio 208) or 10mg DEAE-dextran sole adjuvant vaccine.
  • Vaccine efficacy is in many instances reduced by the ineffective response in a small proportion of the test population and is not usually determined by a maximal and effective response in proportion of the test population.
  • Both of the combined adjuvant vaccines are more effective than the DEAE-dextran alone formulation or the Iscomatrix based vaccine.
  • the response of the combination adjuvant is greater than the additive effect and thus the two components may be judged to be acting in synergy.
  • the mass ratio of 125 is more effective in increasing the lower responding dogs.
  • BVDV virus Two strains of BVDV virus were used, Trangie and Bega, isolated from infected cattle in Australia.
  • the growth medium used was Eagles minimum essential medium containing non essential amino acids single strength and 3% bicarbonate, 2% HEPES and 2% adult bovine serum.
  • a 1x1700 cm 2 roller bottle was innoculated with Trangie (AJ050) at a multiplicity of infection (MOI) of 0.1. The bottle was incubated with rolling for 5 days at 37 degrees C, then frozen.
  • a 1x1700 cm 2 roller bottle inoculated with Bega (WVS p3) at a MOI of 1.0 was incubated with rolling for 5 days at 37 0 C, then frozen. Roller bottles were thawed and the antigen content tested by antigen specific ELISA assays.
  • the characteristics of the preparations used in the vaccine formulation are as follows:
  • NS3 (non structural protein) level 1/8
  • Combination adjuvant Each dose comprised 2 mis of inactivated virus and 1 ml of combination adjuvant.
  • the bulk vaccine was formulated as: mis inactivated Bega and Trangie
  • IscomTM adjuvant Each dose comprised both strains of virus and 2 mg IscomTM as Quil A equivalent, in a total volume of 2 mL.
  • the vaccines were dispensed into a bulk plastic pillow pack after being mixed by vortexing and inversion and stored at 2-8 0 C.
  • Groups 10 sheep were vaccinated with the IscomTM adjuvanted vaccine.
  • Combination adjuvant Sheep were examined at 7 day intervals after the primary and secondary vaccination. One of the 4 sheep developed a score 1 site reaction (small swelling palpable, not visible) after the primary vaccination. This was resolved by 2 weeks post vaccination.
  • IscomTM Sheep were examined at 6 days after boost. 7 of 10 sheep had large reactions at the site of injection.
  • the combination adjuvant had smaller and less frequent site reactions, indicating that it induced lower levels of reactogenicity.
  • Each dose of the above vaccines contained 12.5 micrograms ovalbumin in a 100 ⁇ l_ volume, the volume and concentration of the components being adjusted with sterile water for injection.
  • the mice were vaccinated only once subcutaneously and blood samples taken 14 days later after the primary vaccination at euthanasia. Sera so obtained were assayed for IgM and IgG responses to OVA.
  • mice in the DEAE-dextran and combination adjuvant groups remained well for the 14 days after primary vaccination.
  • mice vaccinated with Iscomatrix died with 8 days of vaccination.
  • mice in the combination adjuvant group remained well, indicating that the combination adjuvant is less reactogenic systemically.
  • mice with the soluble antigen OVA in all of the adjuvants tested induced an antibody responses in both the IgM and IgG isotypes 14 days after a single vaccination.
  • mice with a soluble antigen in the presence of an adjuvant would give rise predominantly to an IgM response.
  • the combined adjuvant induced a strong IgG response in mice vaccinated with OVA 14 days after a single vaccination.
  • This result supports the previous published conclusion (Houston et al, 1976) that DEAE-dextran adjuvant shortens the period to switching from an early IgM to IgG response and thereby increases the IgG response to vaccination at an early stage. This also seems to be a property of the combination adjuvant.
  • Combination adjuvant 150 mg DEAE-dextran with 500 micrograms Iscomatrix, Mass ratio 300-6 heifers.
  • Vaccines were given at week 0 and week 4, with a 2 week post boost bleed being taken at week 6.
  • DEAE-dextran as adjuvant resulted in severe site reactions of score 3 (abscess) in 3 of the vaccinated cattle.
  • the combination adjuvant did not induce severe reactions in any of the cattle, with no score 3 lesions occurring.
  • Serum IgG titres to LHRH at 2 weeks post boost vaccination were determined by ELISA.
  • a filly becomes fertile at about 2 years of age, and as with older mares, it may be desirable to delay breeding for specified periods of time, although particularly in the case of horses from valuable lineages, any such delay for show or other purposes should not be associated with permanent reproductive impairment.
  • An example of an immunocastration product particularly useful in horses is Equity (Pfizer Animal Health) which is currently marketed in Australia and New Zealand, and will soon enter worldwide markets. The use of all such products has come with the concern that immunocastration may not be fully reversible in a sufficiently high percentage of animals, which is of partuclar concern with valuable horses.
  • the present example provides the first demonstration that Equity and other LHRH-based immunocastration products may be used in female horses both with full temporary effect, and full expectation of recovery of reproductive capability.
  • ISC immunosensitized complex
  • a 0.2mg dose of conjugate/0.3 mg dose of Iscomatrix also includes 0.1 mg of Thiomersal as diluted into 1.0 ML buffered isotonic saline containing NaCI (0.85% w/v). disodium hydrogen orthophosphate ⁇ 0.035% w/v), including 0.117% w/v water for injection to bring to final volume.
  • Results are reported in Figure 1 (estrus cycle status and outcomes) for Placebo controls, in comparison with Figure 2A/B (spanning 2 sheets) in which results are provided following administration of Equity according to the indicated (i.e "inject") timeframes.
  • the studies were carried out over a period of 2 years spanning a first year (marked X1 ), the following year ⁇ marked X2) and a further following year (marked X3) as appropriate.
  • the results dramatically show that Equity can be used to control fertility but that long term effects subside such that at least about 95% of mares have returned to fertility after two years, which most animals having a more rapid recovery.
  • risk of reproductive failure following standard administration of the Equity product is very small, which represents a surprising and valuable commercial feature.
  • the first and second injections were made 28 days apart, which is preferred, although a period of 3-6 weeks is also acceptable, and longer periods are also operable. Breeding season of course varies with climate and latitude, but a first injection just prior to breeding season, such as approximately 1-2 moths prior thereto, is typical, and the effects are certainly expected to last at least three months, over a population of mares. It should again be emphasized that although many mares (including fillies) will recover quickly, many will not, and given the breeding values of the animals, assurance of the effectiveness and reversibility of the product is needed. This information, which could not be predicted, is provided by the present studies. Accordingly, the present invention provides for LHRH products that can safely be administered to female horses, with reversibility, wherein said products may be packaged in containers lacking labels warning that a significant fraction of treated animals may not recover reproductive competence.
  • any LHRH peptide may be used, preferably those described herein, which may be conjugated according to standard methods to numerous carrier proteins (again as herein described, including DT, canine distemper virus proteins, tetanus toxoid, and the like), which compositions are preferably adjuvated using Iscomatrix-type products, also as described herein, including those where a fraction or all of said Iscomatrix is replaced by DEAE dextran, or other polydextran, or other suitable adjuvating polymers.
  • carrier proteins also as described herein, including those where a fraction or all of said Iscomatrix is replaced by DEAE dextran, or other polydextran, or other suitable adjuvating polymers.
  • equity is particularly representative of compositions that are both effective and reversible, and is thus very highly preferred in the practice of the present invention.
  • such compositions may also be administered not only to regulate fertility, but also unwanted aggressive or competitive behaviors that may cause injury in groups of horses, during periods

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Abstract

La présente invention concerne une composition d'adjuvant comportant un constituant de macromolécule anionique, notamment un polysaccharide ionique tel que le DEAE-dextrane, et un constituant de saponine, en particulier un constituant de complexe immunostimulant. L'invention concerne des compositions immunogènes comportant un agent immunogène et ladite composition d'adjuvant ainsi que leurs procédés d'utilisation, notamment concernant le comportement sûr et efficace de la régulation de fertilité chez des chevaux.
PCT/IB2008/000606 2007-03-14 2008-03-05 Régulation de fertilité chez des chevaux WO2008110912A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999002180A1 (fr) * 1997-07-09 1999-01-21 Csl Limited Composition immunogene de lh-rh et procedes concernant cette composition
WO2000041720A1 (fr) * 1999-01-08 2000-07-20 Csl Limited Compositions adjuvantes ameliorees a base de saponine et procedes en rapport

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999002180A1 (fr) * 1997-07-09 1999-01-21 Csl Limited Composition immunogene de lh-rh et procedes concernant cette composition
WO2000041720A1 (fr) * 1999-01-08 2000-07-20 Csl Limited Compositions adjuvantes ameliorees a base de saponine et procedes en rapport

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
B. SAUNDERS: "A Distinct Lack Of EquityFor Breeders", THE VIRTUAL FORMGUIDE, 26 November 2004 (2004-11-26), XP002491352, Retrieved from the Internet <URL:http://www.virtualformguide.com/cgi-bin/tvf/displaynewsitem.pl?20041126equity.txt> [retrieved on 20080807] *
STOUT T A E ET AL: "Suppressing reproductive activity in horses using GnRH vaccines, antagonists or agonists", ANIMAL REPRODUCTION SCIENCE, vol. 82-8, no. July, July 2004 (2004-07-01), pages 633 - 643, XP002491365, ISSN: 0378-4320 *

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