CA2462646C - Adjuvanted meningococcus compositions - Google Patents

Abstract

A combination of CpG oligonucleotides and polymer microparticles is an extremely effective adjuvant for Neisserial antigens. The invention therefore provides a composition comprising: (a) a Neisserial antigen; (b) a CpG oligonucleotide; and (c) a biodegradable polymer microparticle.

Description

ADJUVANTED MENINGOCOCCUS COMPOSITIONS
TECHNICAL FIELD
The invention relates to vaccines, more particularly those against Neisseria nieningitidis.
BACKGROUND ART
Genome sequences for Neisseria meningitidis (meningococcus) serogroups A [1]
and B [2,3]
have been reported. The serogroup B sequence has been studied to identify vaccine antigens [e.g.
refs. 4 to 9] and candidate antigens have been manipulated to improve heterologous expression [refs.
10 to 12].

Antigens generally require the co-administration of adjuvants in order to enhance their immunogenicity in vaccines [13]. Freund's adjuvant has been used for serogroup B meningococcus [9], and the licensed vaccine MenjugateTM against serogroup C uses aluminium hydroxide [14].
Enhancement of the bactericidal activity of Neisseria antigens has also been reported by using oligonucleotide adjuvants containing CpG motifs [15].

It is an object of the invention to provide further and improved adjuvants for Neisserial antigens.

DISCLOSURE OF THE INVENTION
It has been found that a combination of CpG oligonucleotides and polymer microparticles is an extremely effective adjuvant for Neisserial antigens, with the combination giving much better results than either of the individual components. The invention therefore provides a composition comprising: (a) a Neisserial antigen; (b) a CpG oligonucleotide; and (c) a biodegradable polymer microparticle.

The Neisserial antigen The Neisserial antigen may be a protein antigen, nucleic acid encoding a protein antigen, or a saccharide antigen. The antigen preferably elicits a bactericidal or protective immune response (e.g.
antibody response) in a recipient mammal.

The antigen may be derived from any species of Neisseria including N.gonorrhoeae, N.lactanxica and N.meningitidis. It is preferably a N.meningitidis antigen and may be from any serogroup. Where the antigen is from serogroup B, it is preferred to use a protein antigen; where it is from serogroup A, C, W135 or Y then it is preferred to use a saccharide antigen. Where saccharide antigens are used, these will typically be derived from the bacterial capsular polysaccharide (e.g.
oligosaccharides, such as those obtained by hydrolysis), and they will typically be conjugated to carrier proteins (e.g. to CRM197).

Preferred protein antigens derived from serogroup B N.meningitidis are:

= a protein disclosed in any one of references 4, 5, 6, 7, 8 or 9 (in particular the 446 even SEQ
IDs (i.e. 2, 4, 6, ... , 890, 892) disclosed in reference 4, the 45 even SEQ
IDs (i.e. 2, 4, 6, ... , 88, 90) disclosed in reference 5 and the 1674 even SEQ IDs 2-3020, even SEQ
IDs 3040-3114, and all SEQ IDs 3115-3241, disclosed in reference 6);

= a protein comprising an immunogenic fragment of one or more of the proteins disclosed in any one of references 4, 5, 6, 7, 8 or 9.
= a protein comprising a sequence having sequence identity (preferably greater than 50% e.g.
60%, 70%, 80%, 90%, 95%, 99% or more) to one or more of the proteins disclosed in any one of references 4, 5, 6, 7, 8 or 9.
= a protein disclosed in any one of references 10, 11 or 12.
= a protein comprising a sequence having sequence identity (preferably greater than 50% e.g.
60%, 70%, 80%, 90%, 95%, 99% or more) to one or more of the proteins disclosed in any one of references 10, 11 or 12.
A particularly preferred protein antigen from serogroup B N.meningitidis is protein `287'.
This protein may be used in a wild-type form [e.g. GenBank accession gi:7228690; alignments of polymorphic forms of 287 are shown in figures 5 & 15 of ref. 8] but derivatives of the wild-type protein may be used. For instance, proteins having 50% or more sequence identity (e.g. 60%, 70%, 80%, 90%, 95%, 99% or more) to gi:7228690 may be used. Proteins comprising truncation or deletion variants of the protein may be used, such as the N-terminal truncated forms disclosed in references 10 to 12 ('AG287' in particular, in which the N-terminus of the protein up to and including the six repeated glycine residues is deleted). Fusion proteins comprising such 287 sequences may be used. All of these forms of 287, and more particularly those which retain the immunogenicity of wild-type 287 proteins, fall within the meaning of `287' as used herein.

Another particularly preferred protein antigen from serogroup B N.meningitidis is protein `961', also known as 'NadA' [16]. This protein may be used in a wild-type form [e.g. GenBank accession gi:7227256; alleles of 961 are disclosed in ref. 17] but derivatives of the wild-type protein may be used. For instance, proteins having 50% or more sequence identity (e.g.
60%, 70%, 80%, 90%, 95%, 99% or more) to gi:7227256 may be used. Proteins comprising truncation or deletion variants of the protein may be used, such as those disclosed in references 10 to 12 ('961c' in particular, which lacks the C-terminal membrane anchor). Fusion proteins comprising such 961 sequences may be used. All of these forms of 961, and particularly those which retain the immunogenicity of wild-type 961 proteins, fall within the meaning of `961' or 'NadA' as used herein.

Other preferred protein antigens are protein `741' and protein `ORF46.1', and proteins `ORF1', `ORF4', `ORF25', `ORF40', `ORF83', `NMB1343', `230', `233', `292', `594', `687', `736', `907', `919', `936', `953', and `983'. Other preferred protein antigens are the hybrid proteins disclosed in references 10 to 12, particularly those comprising one or more of. a 287 protein, a 953 protein, a 936 protein and/or a 741 protein.

Protein antigens may be derived from any strain of N.meningitidis. It is preferred to use antigens from strains 2996, MC58, 95N477 and 394/98.

As well as strain variants, single or multiple conservative amino acid substitutions may be made with altering the immunogenicity of antigens used according to the present invention.

In addition to or in place of protein antigens, nucleic acid encoding a protein antigen may be included within compositions of the invention. The nucleic acid will be expressed in vivo once administered to a mammalian recipient and the protein antigen will be produced. Such nucleic acid immunization is well known [e.g. refs. 18 to 23 etc.]. The nucleic acid will typically be a DNA
plasmid.

A preferred saccharide antigen derived from serogroup C N.fneningitidis is the oligosaccharide conjugate used in MenjugateTM [24, 25], which contains 12 to 22 monosaccharide units from the serogroup C capsular polysaccharide.

A preferred saccharide antigen derived from serogroup A is an oligosaccharide in which one or more of the hydroxyl groups on the constituent monosaccharide units has been replaced by a blocking group [26].

Further oligosaccharide antigens from serogroups A, W135 and Y are disclosed in reference 27.

The composition of the invention may comprise more than one Neisserial antigen. Where saccharides from both serogroups A and C of N.meningitidis are included, it is preferred that the ratio (w/w) of MenA saccharide:MenC saccharide is greater than 1 (e.g. 2:1, 3:1, 4:1, 5:1, 10:1 or higher).

The composition of the invention is preferably an immunogenic composition or vaccine.
Such compositions comprise an immunologically effective amount of the antigen.
By `immunologically effective amount', it is meant that the administration to an individual of a composition of the invention comprising that amount of antigen (either in a single dose or as part of a series) is effective for raising a therapeutic or prophylactic immune response. This amount varies depending upon the health and physical condition of the individual to be treated, age, the taxonomic group of individual to be treated (e.g. non-human primate, primate, etc.), the capacity of the individual's immune system to synthesise antibodies, the degree of protection desired, the formulation of the vaccine, the treating physician's assessment of the medical situation, and other rel-evant factors. The amount may fall in a relatively broad range that can be determined through routine trials. Antigens will typically be present at a concentration of at least 1 g/ml each.

Dosage treatment may be a single dose or a multiple dose schedule (e.g.
including booster doses).

The CpG oligonucleotide CpG oligonucleotides are known for use as vaccine adjuvants [e.g. ref. 28] and they induce strong Thl immune responses. They are useful as parenteral and mucosal adjuvants [29].

The CpG oligonucleotide used according to the present invention is a nucleic acid which includes at least one CG dinucleotide i.e. a cytosine nucleotide followed by a guanosine nucleotide.
The oligonucleotide may contain multiple CG dinucleotides.

A CG sequence in the oligonucleotide may be flanked by two purines at the 5' side and two pyrimidines at the 3' side i.e. RRCGYY.

Cytosine nucleotides in the CpG oligonucleotide may be methylated, but it is preferred that they should be unmethylated.

The cytosine and guanosine nucleotides are preferably deoxynucleotides and the nucleic acid is preferably DNA. In order to enhance nuclease resistance, the oligonucleotide may comprise a modified backbone, such as a phosphorothioate backbone. As an alternative to using DNA, it is possible to use PNA (peptide nucleic acid). In addition, the oligonucleotides can comprise substitutions of the sugar moieties and nitrogenous base moieties.

The oligonucleotide preferably comprises between about 6 and about 100 nucleotides, more preferably between about 8 and about 50 nucleotides, most preferably between about 10 and about 40 nucleotides.

Oligonucleotides comprising at least one CG dinucleotide can conveniently be prepared using conventional oligonucleotide synthesis.

Examples of CpG oligonucleotide adjuvants are found in references 30 to 55.
The biodegradable polymer microparticle Biodegradable polymer microparticles are known for use as vaccine adjuvants [e.g. ref. 56].
They are useful as parenteral and mucosal adjuvants.

As well as being biodegradable, the polymer used to make the microparticles will generally be sterilizable and non-toxic (biocompatible). Suitable biodegradable polymers are readily commercially available and include those derived from polyhydroxybutyric acid;
polycaprolactone;
polyorthoester; polyanhydride; poly(hydoxybutyrate); and a poly(a-hydroxy acid). Preferred polymers are formed from one or more poly(a-hydroxy acid) e.g. poly(L-lactide), poly(D,L-lactide), copolymers of D,L-lactide and glycolide (such as poly(D,L-lactide-co-glycolide), or a copolymer of D,L-lactide and caprolactone. Microparticles formed from poly(D,L-lactide-co-glycolide) ('PLG') are preferred.

These polymers are available in a variety of molecular weights, and the appropriate molecular weight for a given antigen can readily be determined. For poly(L-lactide), a suitable molecular weight will be on the order of about 2000 to 250,000. For PLG, suitable molecular weights will generally range from about 10,000 to about 200,000, preferably about 15,000 to about 150,000, and most preferably about 50,000 to about 100,000.

For PLG microparticles, a variety of lactide:glycolide ratios may be used and the ratio is largely a matter of choice, depending in part on the co-administered antigen and the rate of degradation desired. For example, a 50:50 PLG polymer, containing 50% D,L-lactide and 50%
glycolide, will provide a fast resorbing copolymer while 75:25 PLG degrades more slowly, and 85:15 and 90:10, even more slowly, due to the increased lactide component. A
suitable ratio of lactide:glycolide is easily determined based on the nature of the antigen and disorder in question.
Moreover, mixtures of microparticles with varying lactide:glycolide ratios will find use in the formulations in order to achieve the desired release kinetics for a given antigen and to provide for both a primary and secondary immune response. Degradation rate of the microparticles of the present invention can also be controlled by such factors as polymer molecular weight and polymer crystallinity.

The term `microparticle' as used herein, refers to a particle of about 100 nm to about 150 m in diameter, more preferably about 200 nm to about 30 pm in diameter, and most preferably about 500 nm to about 10 m in diameter. Preferably, the microparticle will be of a diameter that permits parenteral administration without occluding needles and capillaries.
Microparticle size is readily determined by techniques well known in the art, such as photon correlation spectroscopy, laser diffractometry and/or scanning, electron microscopy. The term `microparticle' includes `nanoparticles' [57] within its scope. Preferred microparticles are microspheres, although lamellar particles [58] may also be used.

Microparticles may be prepared using any of several methods well known in the art [e.g. ref.
59]. For example, double emulsion/solvent evaporation techniques [e.g. refs.
60 & 61] can be used to form the microparticles. These techniques involve the formation of a primary emulsion consisting of droplets of polymer solution containing the antigen (if antigen is to be entrapped in the microparticle), which is subsequently mixed with a continuous aqueous phase containing a particle stabilizer/surfactant.

More particularly, a water-in-oil-in-water (w/o/w) solvent evaporation system can be used to form the microparticles, as described in references 62, 63 and 64. In this technique, the particular polymer is combined with an organic solvent, such as ethyl acetate, dimethylchloride (also called methylene chloride and dichloromethane), acetonitrile, acetone, chloroform, and the like. The polymer will be provided in about a 2-15% solution, in organic solvent. An approximately equal amount of an antigen solution (e.g. in water) is added and the polymer/antigen solution emulsified using e.g. a homogenizer. The emulsion is then combined with a larger volume of an aqueous solution of an emulsion stabilizer such as polyvinyl alcohol (PVA) or polyvinyl pyrrolidone. The emulsion stabilizer is typically provided in about a 2-15% solution, more typically about a 4-10%
solution. The mixture is then homogenized to produce a stable w/o/w double emulsion. Organic solvents are then evaporated.

The formulation parameters can be manipulated to allow the preparation of small (<5 Am) and large (>301tm) microparticles [e.g. 63, 65]. For example, reduced agitation results in larger microparticles, as does an increase in internal phase volume. Small particles are produced by low aqueous phase volumes with high concentrations of PVA.

Microparticles can also be formed using spray-drying and coacervation [e.g.
refs. 66, 67 &
68]; air-suspension coating techniques, such as pan coating and Wurster coating [69, 70]; ionic gelation [71].

Prior to use of the microparticles, antigen content is generally determined so that an appropriate amount of the microparticles may be delivered to the subject in order to elicit an adequate immune response.

Antigen content of the microparticles can be determined according to methods known in the art, such as by disrupting the microparticles and extracting entrapped antigen. For example, microparticles can be dissolved in dimethylchloride and the protein extracted into distilled water [e.g.
refs. 72, 73, 74]. Alternatively, microparticles can be dispersed in 0.1 M
NaOH containing 5% (w/v) SDS. The sample is agitated, centrifuged and the supernatant assayed for antigen using an appropriate assay [75].

Antigen and/or CpG-oligonucleotides can be located within or on the microparticles.
Entrapment will generally be achieved by having the antigen/oligonucleotide present during formation of the microparticles, whereas surface adsorption is achieved by adding antigen/oligonucleotide to pre-formed microparticles.

One method for adsorbing antigen/oligonucleotide onto prepared microparticles is as follows.
Microparticles are rehydrated and dispersed to an essentially monomeric suspension of microparticles using dialyzable anionic or cationic detergents. Useful detergents include, but are not limited to, any of the various N-methylglucamides (known as MEGAs), such as heptanoyl-N-methylglucamide (MEGA-7), octanoyl-N-methylglucamide (MEGA-8), nonanoyl-N-methylglucamide (MEGA-9), and decanoyl-N-methyl-glucamide (MEGA-10); cholic acid; sodium cholate; deoxycholic acid; sodium deoxycholate; taurocholic acid; sodium taurocholate;
taurodeoxycholic acid; sodium taurodeoxycholate; 3-[(3-cholamidopropyl)dimethylammonio]-1-propane-sulfonate (CHAPS); N-octylglucoside; 3-[(3-cholamidopropyl) dimethylammonio]-2-hydroxy-l-propane-sulfonate (CHAPSO); N-dodecyI-N,N-dimethyl-3-ammonio-l-propane-sulfonate (ZWITTERGENT* 3-12); N,N-bis-(3-D-gluconeamidopropyl)-deoxycholamide (DEOXY-Trade-mark 6 BIGCHAP); sucrose monolaurate; glycocholic acid/sodium glycocholate;
laurosarcosine (sodium salt); glycodeoxycholic acid/sodium glycodeoxycholate; sodium dodceyl sulfate (SDS); and hexadecyltrimethylammonium bromide (CTAB); dodecyltrimethylammonium bromide;
hexadecyltrimethyl-ammonium bromide; tetradecyltrimethylammonium bromide;
benzyl dimethyldodecylammonium bromide; benzyl dimethyl-hexadecylammonium chloride;
benzyl dimethyltetra-decylammonium bromide. The above detergents are commercially available. Various cationic lipids known in the art can also be used as detergents [76, 77].

The microparticle/detergent mixture is then physically ground e.g. using a ceramic mortar and pestle, until a smooth slurry is formed. An appropriate aqueous buffer, such as phosphate buffered saline (PBS) or Tris buffered saline, is then added and the resulting mixture sonicated or homogenized until the microparticles are fully suspended. The antigen/oligonucleotide is then added to the microparticle suspension and the system dialyzed to remove detergent.
The polymer microparticles and detergent system are preferably chosen such that the antigen/oligonucleotide will adsorb to the microparticle surface while still maintaining activity . The resulting microparticles containing surface adsorbed antigen/oligonucleotide may be washed free of unbound antigen/oligonucleotide and stored as a suspension in an appropriate buffer formulation, or lyophilized with the appropriate excipients, as described further below.

The antigen/CpG/microparticle combination Various physical relationships are possible between the three basic components of the compositions of the invention. These arise because the microparticles have an internal volume and a surface, either of which may be used to locate the CpG-oligonucleotide and/or the antigen.

Thus the antigen may be entrapped within microparticles, it may be adsorbed to microparticles, or it may be in simple admixture with the microparticles without entrapment or adsorption. Adsorption is preferred.

Similarly, the CpG-oligonucleotide may be entrapped within microparticles, it may be adsorbed to microparticles, or it may be in simple admixture with the microparticles. Adsorption can be achieved using detergents such as CTAB.

The CpG-oligonucleotide and the antigen may both have the same physical relationship to the microparticles as each other, or they may be different. Likewise the CpG-oligonucleotide and the antigen may be adsorbed onto the same microparticle or the CpG-oligonucleotide and the antigen may be adsorbed onto different microparticles. All possible combinations are encompassed within the present invention:

CpG-oligonucleotide Entrapped Adsorbed Mixed Entrapped Yes Yes Yes Adsorbed Yes Yes Yes Trade-mark I I Mixed Yes Yes Yes Compositions of the invention may include mixtures of the above e.g. some microparticles within the composition have entrapped antigen and some have adsorbed antigen.

Pharmaceutical compositions For pharmaceutical use, compositions of the invention will generally comprise a pharmaceutically acceptable carrier. This gives a pharmaceutical composition of the invention.

A pharmaceutically acceptable carrier can be any substance that does not itself induce the production of antibodies harmful to the patient receiving the composition, and which can be administered without undue toxicity. Suitable carriers can be large, slowly-metabolised macromolecules such as proteins, polysaccharides, polylactic acids, polyglycolic acids, polymeric amino acids, amino acid copolymers, and inactive virus particles. Such carriers are well known to those of ordinary skill in the art. Pharmaceutically acceptable carriers can include liquids such as water, saline, glycerol and ethanol. Auxiliary substances, such as wetting or emulsifying agents, pH
buffering substances, and the like, can also be present in such vehicles. Liposomes are suitable carriers. A thorough discussion of pharmaceutical carriers is available in ref. 78.

Compositions of the invention may be prepared in various forms. For example, the compositions may be prepared as injectables, either as liquid solutions or suspensions. Solid forms suitable for solution in, or suspension in, liquid vehicles prior to injection can also be prepared. The composition may be prepared for topical administration e.g. as an ointment, cream or powder. The composition be prepared for oral administration e.g. as a tablet or capsule, or as a syrup (optionally flavoured). The composition may be prepared for pulmonary administration e.g.
as an inhaler, using a fine powder or a spray. The composition may be prepared as a suppository or pessary. The composition may be prepared for nasal, aural or ocular administration e.g. as drops, as a spray, or as a powder [e.g. 79].

The pharmaceutical composition is preferably sterile. It is preferably pyrogen-free. It is preferably buffered e.g. at between pH 6 and pH 8, generally around pH 7.

The pharmaceutical composition may be lyophilised.

The invention also provides a delivery device containing a pharmaceutical composition of the invention. The device may be, for example, a syringe.

Medical treatments and uses Compositions of the invention may be used therapeutically (i.e. to treat an existing Neisserial infection) or prophylactically (i.e. to prevent future Neisserial infection).

The invention provides a composition of the invention for use as a medicament.

The invention also provides a method for raising an antibody response in a mammal, comprising administering a pharmaceutical composition of the invention to the mammal. The antibody response is preferably an IgA or IgG response and it is preferably bactericidal.

The invention also provides a method for treating a mammal suffering from a Neisserial infection and/or disease, comprising administering to the patient a pharmaceutical composition of the invention.

The invention also provides a method for protecting a mammal against a Neisserial infection and/or disease, comprising administering to the mammal a pharmaceutical composition of the invention.

The invention also provides the use of (a) a Neisserial antigen, (b) a CpG
oligonucleotide, and (c) a biodegradable polymer microparticle, in the manufacture of a medicament for preventing or treating disease and/or infection in an mammal.

The mammal is preferably a human. The human may be an adult or, preferably, a child.
Compositions of the invention are particularly useful for immunising children and teenagers.

The uses and methods of the invention are particularly useful for treating/protecting against infections of N.ineningitidis. The uses and methods are particularly useful for preventing/treating diseases including bacterial meningitis.

Efficacy of therapeutic treatment can be tested by monitoring Neisserial infection after administration of the composition of the invention. Efficacy of prophylactic treatment can be tested by monitoring anti-Neisseria immune responses after administration of the composition.

Compositions of the invention will generally be administered directly to a patient. Direct delivery may be accomplished by parenteral injection (e.g. subcutaneously, intraperitoneally, intravenously, intramuscularly, or to the interstitial space of a tissue), or by rectal, oral, vaginal, topical, trarisdermal, ocular, nasal, aural, or pulmonary administration. Injection or intranasal administration is preferred.

Dosage treatment can be a single dose schedule or a multiple dose schedule.
Further components Compositions of the invention may include adjuvants in addition to CpG-oligonucleotides and polymer microparticles. Preferred further adjuvants include, but are not limited to: (A) aluminium compounds (e.g. aluminium hydroxide, aluminium phosphate, aluminium hydroxyphosphate, oxyhydroxide, orthophosphate, sulphate etc. [e.g. see chapters 8 & 9 of ref. 13]), or mixtures of different aluminium compounds, with the compounds taking any suitable form (e.g.
gel, crystalline, amorphous etc.), and with adsorption being preferred; (B) MF59 (5% Squalene, 0.5%
Tween 80, and 0.5% Span 85, formulated into submicron particles using a microfluidizer) [see Chapter 10 of 13; see also ref. 80]; (C) liposomes [see Chapters 13 and 14 of ref. 13]; (D) ISCOMs * Trade-mark 9 [see Chapter 23 of ref. 13], which may be devoid of additional detergent [81];
(E) SAF, containing 10% Squalane, 0.4% Tween 80, 5% pluronic-block polymer L121, and thr-MDP, either microfluidized into a submicron emulsion or vortexed to generate a larger particle size emulsion [see Chapter 12 of ref. 13]; (F) RibiTm adjuvant system (RAS), (Ribi Imrnunochem) containing 2%
Squalene, 0.2% Tween 80, and one or more bacterial cell wall components from the group consisting of monophosphorylipid A (MPL), trehalose dimycolate (TDM), and cell wall skeleton (CWS), preferably MPL + CWS (DetoxTM); (G) saponin adjuvants, such as QuilA or QS21 [see Chapter 22 of ref. 13], also known as StimulonTM [82]; (H) chitosan [e.g. 83]; (I) complete Freund's adjuvant (CFA) and incomplete Freund's adjuvant (1FA); (J) cytokines, such as interleukins (e.g. IL-1, IL-2, IL-4, IL-5, IL-6, IL-7, IL-12, etc.), interferons (e.g. interferon-y), macrophage colony stimulating factor, tumor necrosis factor, etc. [see Chapters 27 & 28 of ref. 13]; (K) monophosphoryl lipid A
(MPL) or 3-0-deacylated MPL (3dMPL) [e.g. chapter 21 of ref. 13]; (L) combinations of 3dMPL
with, for example, QS21 and/or oil-in-water emulsions [84]; (M) a polyoxyethylene ether or a polyoxyethylene ester [85]; (N) a polyoxyethylene sorbitan ester surfactant in combination with an octoxynol [86] or a polyoxyethylene alkyl ether or ester surfactant in combination with at least one additional non-ionic surfactant such as an octoxynol [87]; (N) a particle of metal salt [88]; (0) a saponin and an oil-in-water emulsion [89]; (P) a saponin (e.g. QS21) + 3dMPL-+
IL-12 (optionally +
a sterol) [90]; (Q) E.coli heat-labile enterotoxin ("LT"), or detoxified mutants thereof, such as the K63 or R72 mutants [e.g. Chapter 5 of ref. 91]; (R) cholera toxin ("CT"), or detoxified mutants thereof [e.g. Chapter 5 of ref. 91]; (S) double-stranded RNA and (T) other substances that act as immunostimulating agents to enhance the effectiveness of the composition [e.g.
see Chapter 7 of ref.
13]. Alum (especially aluminium phosphate and/or hydroxide) and MF59 are preferred further adjuvants for parenteral immunisation. Mutant toxins are preferred mucosal adjuvants.

Muramyl peptides include N-acetyl-muramyl-L-threonyl-D-isoglutamine (thr-MDP), N-acetyl-normuramyl-L-alanyl-D-isoglutamine (nor-MDP), N-acetylmuramyl-L-alanyl-D-isoglutaminyl-L-alanine-2-(1'-2'-dipalmitoyl-sn-glycero-3-hydroxyphosphoryloxy)-ethylamine MTP-PE), etc.

As well as Neisserial antigen(s), the composition may comprise further antigenic components. Antigens which can be included in the composition of the invention include:

- antigens from Helicobacter pylori such as CagA [92 to 95], VacA [96, 97], NAP [98, 99, 100], HopX [e.g. 101], HopY [e.g. 1011 and/or urease.
- an outer-membrane vesicle (OMV) preparation from N.meningitidis serogroup B, such as those disclosed in refs. 102, 103, 104, 105 etc.
- a saccharide antigen from Streptococcus pneumoniae [e.g. 106, 107, 108].
- an antigen from hepatitis A virus, such as inactivated virus [e.g. 109, 110].
- an antigen from hepatitis B virus, such as the surface and/or core antigens [e.g. 110, 111].
- an antigen from hepatitis C virus [e.g. 112].

Trade-mark - an antigen from Bordetella pertussis, such as pertussis holotoxin (PT) and filamentous haemagglutinin (FHA) from B.pertussis, optionally also in combination with pertactin and/or agglutinogens 2 and 3 [e.g. refs. 113 & 114].
- a diphtheria antigen, such as a diphtheria toxoid [e.g. chapter 3 of ref.
115] e.g. the CRM197 mutant [e.g. 116].
- a tetanus antigen, such as a tetanus toxoid [e.g. chapter 4 of ref. 115].
- a saccharide antigen from Haemophilus influenzae B [e.g. 23].
- an antigen from Chlamydia pneumoniae [e.g. 117, 118, 119, 120, 121, 122, 123].
- an antigen from Chlaniydia trachomatis [e.g. 124].
- an antigen from Porphyromonas gingivalis [e.g. 125].
- polio antigen(s) [e.g. 126, 127] such as IPV or OPV.
- rabies antigen(s) [e.g. 128] such as lyophilised inactivated virus [e.g.
129, RabAvertTM].
- measles, mumps and/or rubella antigens [e.g. chapters 9, 10 & 11 of ref.
115].
- antigen(s) from influenza virus [e.g. chapter 19 of ref. 115], such as the haemagglutinin and/or neuraminidase surface proteins - antigen(s) from a paarmyxovirus such as respiratory syncytial virus (RSV
[130, 131]) and/or parainfluenza virus (PIV3 [132]).
- an antigen from Moraxella catarrhalis [e.g. 133].
- an antigen from Streptococcus agalactiae (group B streptococcus) [e.g. 134, 135].
- an antigen from Streptococcus pyogenes (group A streptococcus) [e.g. 135, 136, 137].
- an antigen from Staphylococcus aureus [e.g. 138].
- an antigen from Bacillus anthracis [e.g. 139, 140, 141].
- an antigen from a virus in the flaviviridae family (genus flavivirus), such as from yellow fever virus, Japanese encephalitis virus, four serotypes of Dengue viruses, tick-borne encephalitis virus, West Nile virus.
- a pestivirus antigen, such as from classical porcine fever virus, bovine viral diarrhoea virus, and/or border disease virus.
- a parvovirus antigen e.g. from parvovirus B19.
- a prion protein (e.g. the CJD prion protein) - an amyloid protein, such as a beta peptide [142]
- a cancer antigen, such as those listed in Table 1 of ref. 143 or in tables 3 & 4 of ref. 144.
The composition may comprise one or more of these further antigens.

Toxic protein antigens may be detoxified where necessary (e.g. detoxification of pertussis toxin by chemical and/or genetic means [114]).

Where a diphtheria antigen is included in the composition it is preferred also to include tetanus antigen and pertussis antigens. Similarly, where a tetanus antigen is included it is preferred also to include diphtheria and pertussis antigens. Similarly, where a pertussis antigen is included it is preferred also to include diphtheria and tetanus antigens.

Antigens are preferably adsorbed to an aluminium salt.

Antigens in the composition will typically be present at a concentration of at least 1 g/ml each. In general, the concentration of any given antigen will be sufficient to elicit an immune response against that antigen.

As an alternative to using proteins antigens in the composition of the invention, nucleic acid encoding the antigen may be used. Protein components of the compositions of the invention may thus be replaced by nucleic acid (preferably DNA e.g. in the form of a plasmid) that encodes the protein.
Definitions The term "comprising" means "including" as well as "consisting" e.g. a composition "comprising" X may consist exclusively of X or may include something additional e.g. X + Y.
References to a percentage sequence identity between two amino acid sequences means that, when aligned, that percentage of amino acids are the same in comparing the two sequences. This alignment and the percent homology or sequence identity can be determined using software programs known in the art, for example those described in section 7.7.18 of reference 145. A preferred alignment is determined by the Smith-Waterman homology search algorithm using an affine gap search with a gap open penalty of 12 and a gap extension penalty of 2, BLOSUM
matrix of 62. The Smith-Waterman homology search algorithm is taught in reference 146.

MODES FOR CARRYING OUT THE INVENTION

Parenteral prime & mucosal boost with Neisseria meningitidis serogroup B
antigen Reference 6 discloses a protein from serogroup B N.meningitidis called `287'.
References 10 to 12 disclose ways of improving its expression. One way involves deleting the N-terminus of the protein up to and including the six repeated glycine residues. This protein is referred to as 'AG287'.

Mice were primed and boosted with MenB AG287 antigen (201tg/dose) from strain 2996, formulated for intramuscular (IM) administration by adsorption to PLG
microparticles, with or without CpG oligonucleotide (also adsorbed to the microparticles). An additional formulation for intranasal (IN) administration used LT-K63 adjuvant. Mice received either 3 IM
doses or 2 IM then 2 IN doses (doses at: day 0; day 28; day 84; and, optionally, day 98).

Antibody GMT 2 weeks after Group Formulation Route Dose dose 2 Dose 3 dose 4 1 PLG/287 IM 1, 2, 3 10,729 2,853 -2 PLG/287 + PLG/CpG IM 1, 2, 3 15,673 4,163 -3 PLG/287 IM 1, 2 9,064 7,948 9,412 287 + LT-K63 IN 3, 4 PLG/287 + PLG/CpG IM 1,2 4 34,891 15,167 16,556 287 + LT-K63 IN 3,4 Thus the inclusion of CpG-oligonucleotide enhanced antibody titers against intramuscularly administered MenB protein 287 (compare groups 1 & 2). Titers could be enhanced by replacing a third intramuscular dose with two intranasal doses (compare groups 1 & 3). The CpG enhancement was also seen in the intramuscular/intranasal regime (compare groups 3 & 4).

Comparison of adjuvants for MenB protein 287 AG287 was formulated with various adjuvants and administered to mice. Sera from the mice were assessed using the bactericidal antibody (BCA) assay and titers were as follows:

Adjuvant BCA post-2 BCA post-3 Freund's adjuvant 2048 8192 Alum <4 256 Alum + CpG oligonucleotide 256 4096 MF59 <4 <4 CpG oligonucleotide <4 128 PLG microparticles (adsorbed) 8 1024 PLG microparticles (adsorbed) + CpG 2048 16384 CpG-oligonucleotide was thus only mildly effective as an adjuvant, almost comparable to alum. The PLG microparticles were more effective than both alum and CpG, but not as effective as Freund's adjuvant. In marked contrast, however, the mixture of CpG and PLG
matched the adjuvanticity of Freund's adjuvant at the post-second immunization stage and exceeded Freund's adjuvant post-third immunization.

Enhancement of PLG adjuvanticity by using CpG was also seen in a separate study (02-0279):

Adjuvant GMT post-2 GMT post-3 PLG microparticles (adsorbed) 7070 11367 PLG microparticles (adsorbed) + CpG 15099 26833 Effect of adsorption on adjuvanticity The effect of adsorption on adjuvanticity was studied. Protein AG287 was either adsorbed onto PLG microparticles using DSS surfactant or SDS or was simply mixed with the particles.
Immunisations were performed on days 0, 21 and 35 and titers were assessed on days 35 and 49.
20, Results were as follows:

Antibody titer 2 weeks after Formulation BCA dose 2 Dose 3 CpG + 287 adsorbed on PLG (DSS) 4096 45817 67921 CpG + 287 adsorbed on PLG (SDS) 4096 39730 29911 CpG + 287 + PLG (no adsorption) <16 62 1065 DSS + 287 adsorbed on alum <16 1209 1249 CpG + 287 adsorbed on Alum 1024 4054 12236 287 adsorbed on alum 128 646 2454 The adjuvanticity of CpG and microparticle mixtures for AG287 is thus optimal when the antigen is adsorbed to microparticles.

Reference 6 discloses a protein from serogroup B N.ineningitidis called `961' (now known as 'NadA' [16,17]). References 10 to 12 disclose ways of improving the expression of NadA. One way involves deleting the C-terminus of the protein to remove its membrane anchor (i.e. remove amino acids 351-405 for strain 2996), as well as natural removal of its leader peptide. This protein is referred to as '961c'. The effect of adsorption on PLG adjuvanticity when co-administered with CpG
was studied for 961c, as described above for 287:

Antibody titer 2 weeks Formulation BCA after dose 3 961 adsorbed on PLG (SDS) 2048 20661 961 + PLG (no adsorption) 256 1706 287 adsorbed on PLG 4096 63057 287 adsorbed on PLG + 961 soluble 4096 287:86052;961:1924 287 adsorbed on PLG + 961 adsorbed on PLG 8192 287:107142;961:11717 287 (not adsorbed) + 961 (not adsorbed) + `blank' 1024 287:1266;961:145 PLG
287 (adsorbed) + 961 (adsorbed) + `blank' PLG 8192 287: 78176; 961: 20876 As for AG287, therefore, the adjuvanticity of CpG and microparticle mixtures for 961c is optimal when the antigen is adsorbed to microparticles. This is true for the antigen on its own and the antigen when combined with AG287.

For both AG287 and 961c, therefore, singly and combined, the best adjuvanticity for CpG
and PLG mixtures is seen when the antigens are adsorbed onto the PLG
microparticles.

PLG, CpG, alum and MF59 Various combinations of PLG, CpG and alum were tested for protein AG287, expressed as a His-tagged product. Serum bactericidal titers after three immunisations were as follows:

Adjuvant Titer Alum 2048 Alum + CpG 32768 MF59 + CpG 32768 PLG (antigen adsorbed to PLG) 1024 PLG + CpG (antigen and CpG both adsorbed to PLG) 4096 PLG + MF59 (antigen adsorbed to PLG) 2048 PLG + MF59 + CpG (antigen adsorbed to PLG) 8192 Complete Freund's 32768 PLG + Complete Freund's (antigen adsorbed to PLG) 2048 Similar experiments were performed and results were as follows:

Adjuvant Titer PLG (antigen adsorbed to PLG) 1024 PLG + CpG (antigen adsorbed to PLG) 16384 PLG + CpG (antigen and CpG both adsorbed to PLG) 16384 PLG + alum (antigen adsorbed to PLG) 1024 PLG + alum + CpG (antigen adsorbed to PLG) 16384 PLG + alum + CpG (antigen and CpG both adsorbed to PLG) 8192 PLG + MF59 (antigen adsorbed to PLG) 4096 PLG + MF59 + CpG (antigen adsorbed to PLG) 16384 Alum (antigen adsorbed to alum) 256 CpG 128 Alum + CpG 1024 Alum + CpG + PLG (antigen adsorbed to alum; CpG adsorbed to PLG) 4096 CpG + PLG (CpG adsorbed on PLG; antigen not adsorbed) 64 Thus MF59 and alum can further enhance efficacy of CpG/PLG mixtures, adsorption of CpG
to PLG microparticles is not necessary for adjuvanticity, but adsorption of antigen to microparticles is again seen to be optimal.

Antigen mixtures The effect of adsorption on adjuvanticity was studied for proteins AG287 and 961c, singly and in combination. Antibody titers after three doses were as follows:

Antibody GMT against Formulation 287 961 CpG + 961 adsorbed on PLG - 20661 CpG + 961 + PLG (no adsorption) - 1706 CpG + 961 + 287 adsorbed on PLG 86052 1924 CpG + 961 adsorbed on PLG + 287 adsorbed on PLG 107142 11717 CpG + 287 adsorbed on PLG 63057 -CpG + 287 & 961 co-adsorbed on PLG 57306 6251 CpG + 961 adsorbed on PLG + 287 adsorbed on PLG + PLG 78176 20876 287 + 961 + PLG (no adsorption of antigens) 1266 145 As for AG287, therefore, the adjuvanticity of CpG and microparticle mixtures for protein 961c is optimal when the antigen is adsorbed to microparticles.

Further combinations of adjuvants with PLG microparticles were tested for proteins AG287 and 961c. The CpG was either soluble or was adsorbed to PLG microparticles.
Results were as follows:

GMT against Formulation + PLG microparticles BCA 287 961 287 (adsorbed on PLG) + 961 (adsorbed on PLG) 256 5719 2412 287 (adsorbed on PLG) + 961 (adsorbed on PLG) + CpG 512 17553 8627 287 (adsorbed on PLG) + 961 (adsorbed on PLG) + CpG (adsorbed on PLG) 1024 287 (adsorbed on PLG) + 961 (adsorbed on PLG) + MF59 64 4636 3969 287 (adsorbed on PLG) + 961 (adsorbed on PLG) + MF59 + CpG 2048 23642 48446 Similar work was performed on groups of 10 CD-1 mice, using 201tg per PLG-adsorbed antigen per IM dose (days 0, 21 and 35). Where CpG was present, it was given at 10 g per dose.
ELISA titers (GMT) were calculated as the reciprocal serum dilution giving OD450. 0.5, and sera were tested for both antigens. Serum bactericidal activity titers (SBA) are calculated as the reciprocal serum dilution killing 50% of target bacteria, and sera were tested for activity against 2996 strain and against MC58, a heterologous strain. Titers at day 49 (2 weeks post-third dose) were as follows:

287 961 Extra adjuvant GMT SBA

X - - 8375 - 512 <4 X - Soluble CpG 33736 - 1024 128 X - PLG-adsorbed CpG 32058 - 1024 64 X - - 3818 nd nd X Soluble CpG - 14149 2048 <4 - X PLG-adsorbed CpG - 18526 2048 <4 X X - 13557 2476 nd nd X X Soluble CpG 21664 6557 8192 64 X X PLG-adsorbed CpG 27259 7510 2048 128 X X Soluble CpG + MF59 27981 26826 2048 256 Control: soluble 287 with CFA 37889 - 1024 <32 Control: soluble 961 with CFA - 50453 4096 <4 Control: soluble 287 and 961 with CFA 1678 27069 512 <32 Reference 12 discloses a combination of three proteins which, between them, include five different N.nzeningitidis antigens: (1) 96102996; (2) AG287NZ-9532996; and (3) 9362996-AG741MC58=
The antigen mixture was tested in reference 12 using aluminum hydroxide adjuvant. According to the present invention, the antigen mixture is adjuvanted by adsorption to a biodegradable polymer microparticle plus a CpG oligonucleotide. Titers after the third dose were as follows:

ELISA GMT SBA (against seven strains) Immunisation 961 287 741 953 2996 MC58 BZ133 394/98 NGH38 F6124 44/76 (1) 961 on alum 12346 - - - 4096 <4 <4 <4 <4 64 <4 (2) 287-953 on alum - 6415 - 585 1024 1024 256 1024 4096 256 1024 (3) 936-741 on alum - - 10625 - <4 32768 16384 1024 128 16384 32768 (1), (2) & (3) on alum 42302 18206 33881 4549 8192 32768 32768 2048 4096 32768 (1) 961 on PLG 14185 - - - 2048 4 <4 <4 16 256 <4 (2) 287-953 on PLG - 43515 - 478 2048 128 2048 2048 8192 4096 128 (3) 936-741 on PLG - - 16150 - <4 32768 16384 1024 512 8192 262144 (1),(2) & (3) on PLG 6735 24304 13801 1214 4096 65536 32768 2048 4096 32768 (1), (2) & (3) on PLG + CpG 10896 40697 26966 2301 8192 262144 65536 4096 8192 Compared to the aluminum adjuvant used in reference 12, the PLG+CpG mixture leads to lower overall antibody titers (except for protein 287) but, importantly, gives higher bactericidal titers against a wide range of strains. Although absolute titers are lower, therefore, the adjuvant of the invention therefore advantageously shifts antibody production towards bactericidal antibodies.

It will be understood that the invention has been described by way of example only and modifications may be made whilst remaining within the scope and spirit of the invention.

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Claims (22)

CLAIMS:

1. An immunogenic composition comprising: (a) a Neisserial antigen; (b) a CpG
oligonucleotide; and (c) a biodegradable polymer microparticle, wherein the Neisserial antigen comprises Neisseria meningitidis .increment.G287 protein and the Neisserial antigen elicits a bactericidal immune response in a recipient mammal against serogroup B
Neisseria meningitidis.

2. The composition of claim 1, wherein the CpG oligonucleotide comprises between about 6 and about 100 deoxyribonucleotides.

3. The composition of claim 1 or 2, wherein the biodegradable polymer microparticles comprise a poly(.alpha.-hydroxy acid).

4. The composition of claim 3, wherein the microparticles comprise poly(D,L-lactide-co-glycolide).

5. The composition of any one of claims 1 to 4, wherein the Neisserial antigen is entrapped within the microparticles.

6. The composition of any one of claims 1 to 5, wherein the Neisserial antigen is adsorbed to the microparticles.

7. The composition of any one of claims 1 to 6, wherein the CpG
oligonucleotide is entrapped within the microparticles.

8. The composition of any one of claims 1 to 6, wherein the CpG
oligonucleotide is adsorbed to the microparticles.

9. The composition of any one of claims 1 to 8, comprising a further adjuvant.

10. The composition of claim 9, wherein the adjuvant is MF59 adjuvant.

11. The composition of claim 9, wherein the adjuvant is an aluminum salt adjuvant.

12. The composition of any one of claims 1 to 11, comprising at least one further non-Neisserial antigen.

13. The composition of any one of claims 1 to 12, wherein the Neisserial antigen is a fusion protein comprising the Neisseria meningitidis .increment.G287 protein.

14. The composition of any one of claims 1 to 13, further comprising a pharmaceutically acceptable carrier.

15. The composition of any one of claims 1 to 14, for use as a medicament for the treatment of a serogroup B Neisseria meningitidis infection or disease.

16. Use of the composition of any one of claims 1 to 14, for raising an antibody responsein a mammal against the Neisserial antigen.

17. Use of the composition of any one of claims 1 to 14, for treatment of a mammal suffering from a serogroup B Neisseria meningitidis infection or disease.

18. Use of the composition of any one of claims 1 to 14, for protecting a mammal against a serogroup B Neisseria meningitidis infection or disease.

19. The use of a Neisserial antigen, as defined in any one of claims 1 to 14, in the manufacture of a medicament for preventing or treating a serogroup B Neisseria meningitidis disease or infection in a mammal.

20. An immunogenic composition comprising (a) an isolated Neisserial antigen comprising a .increment.G287 form of the wild-type 287 protein of strain 394/98 of serogroup B
Neisseria meningitidis that retains the immunogenicity of said wild-type 287 protein of said 394/98 of serogroup B Neisseria meningitidis; (b) a CpG oligonucleotide; and (c) biodegradable poly (.alpha.-hydroxy acid) microparticles.

21. The immunogenic composition of claim 6, further comprising an isolated 961c form of the wild-type 961 protein of strain 2996 of serogroup B Neisseria meningitidis that retains the immunogenicity of said wild-type 961 protein of said 2996 of serogroup B
Neisseria meningitidis, wherein the antigen is adsorbed to the microparticles.

22. The composition of claim 21, further comprising MF59.