US20150297725A1 - Cochleates made with soy phosphatidylserine - Google Patents

Cochleates made with soy phosphatidylserine Download PDF

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US20150297725A1
US20150297725A1 US14/418,392 US201314418392A US2015297725A1 US 20150297725 A1 US20150297725 A1 US 20150297725A1 US 201314418392 A US201314418392 A US 201314418392A US 2015297725 A1 US2015297725 A1 US 2015297725A1
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cochleates
soy
amphotericin
aminoglycoside
cochleate
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Raphael Mannino
Ruying Lu
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Rutgers State University of New Jersey
Matinas Biopharma Nanotechnologies Inc
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Rutgers State University of New Jersey
Aquarius Biotechnologies Inc
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
    • A61K47/24—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing atoms other than carbon, hydrogen, oxygen, halogen, nitrogen or sulfur, e.g. cyclomethicone or phospholipids
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/10—Dispersions; Emulsions
    • A61K9/127—Liposomes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/12—Ketones
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/12—Ketones
    • A61K31/122—Ketones having the oxygen directly attached to a ring, e.g. quinones, vitamin K1, anthralin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/66—Phosphorus compounds
    • A61K31/683—Diesters of a phosphorus acid with two hydroxy compounds, e.g. phosphatidylinositols
    • A61K31/685—Diesters of a phosphorus acid with two hydroxy compounds, e.g. phosphatidylinositols one of the hydroxy compounds having nitrogen atoms, e.g. phosphatidylserine, lecithin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/7028—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages
    • A61K31/7034—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages attached to a carbocyclic compound, e.g. phloridzin
    • A61K31/7036—Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages attached to a carbocyclic compound, e.g. phloridzin having at least one amino group directly attached to the carbocyclic ring, e.g. streptomycin, gentamycin, amikacin, validamycin, fortimicins
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/7042—Compounds having saccharide radicals and heterocyclic rings
    • A61K31/7048—Compounds having saccharide radicals and heterocyclic rings having oxygen as a ring hetero atom, e.g. leucoglucosan, hesperidin, erythromycin, nystatin, digitoxin or digoxin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K33/00—Medicinal preparations containing inorganic active ingredients
    • A61K33/06—Aluminium, calcium or magnesium; Compounds thereof, e.g. clay
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
    • A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/02—Inorganic compounds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/10—Dispersions; Emulsions
    • A61K9/127—Liposomes
    • A61K9/1274—Non-vesicle bilayer structures, e.g. liquid crystals, tubules, cubic phases, cochleates; Sponge phases
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/10—Dispersions; Emulsions
    • A61K9/127—Liposomes
    • A61K9/1277—Processes for preparing; Proliposomes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/19—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles lyophilised, i.e. freeze-dried, solutions or dispersions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/04—Antibacterial agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/10—Antimycotics

Definitions

  • the present invention relates to the ability of unpurified or low purity (40-74% by weight) soy-based phosphatidylserine (PS) to prepare cochleates, methods of preparing drug-cochleates from soy-based PS and the use of this drug-loaded cochleate as a pharmaceutical treatment.
  • PS soy-based phosphatidylserine
  • Cochleate delivery vehicles are a broad-based technology for the delivery of a wide range of bioactive therapeutic products.
  • Cochleate delivery vehicles are stable phospholipid-cation precipitates composed of simple, naturally occurring materials, for example, phosphatidylserine and calcium.
  • the bilayer structure of cochleates provides protection from degradation for associated, or “encochleated,” molecules. Since the entire cochleate structure is a series of solid layers, components within the interior of the cochleate structure remain substantially intact, even though the outer layers of the cochleate may be exposed to harsh environmental conditions or enzymes. This includes protection from digestion in the stomach.
  • cochleates have been used to mediate and enhance the oral bioavailability of a broad spectrum of important but difficult to formulate biopharmaceuticals, including compounds with poor water solubility, protein and peptide drugs, and large hydrophilic molecules.
  • biopharmaceuticals including compounds with poor water solubility, protein and peptide drugs, and large hydrophilic molecules.
  • cochleate-mediated oral delivery of amphotericin B, large DNA constructs/plasmids for DNA vaccines and gene therapy, peptide formulations, and antibiotics such as clofazimine has been achieved.
  • Cochleates can be stored in cation-containing buffer, or lyophilized to a powder, stored at room temperature, and reconstituted with liquid prior to administration. Lyophilization has no adverse effects on cochleate morphology or functions. Cochleate preparations have been shown to be stable for more than two years at 4° C. in a cation-containing buffer, and at least one year as a lyophilized powder at room temperature.
  • Cochleates can be prepared by several methods, such as trapping or hydrogel methods (International Application Publication No. WO 03/082209, the entire content of which is incorporated herein by reference).
  • Soy PS is sold in health food stores as a nutritional supplement.
  • Non-purified (40%) PS has been used and studied as a nutritional supplement and as a component that has a beneficial effect on enhancing the brain functions in elderly people (Villardita C et al., Clin. Trials J. 24, 1987, 84-93).
  • NSPS non-purified soy PS
  • NSPS or low purity PS
  • NSPS does not form cochleates and that a purification process is needed to enhance the NSPS in the content of PS, until at least about 75% by weight of PS is reached, such percentage allowing the formation of cochleates.
  • improved lipid based cochleates are made by using non-purified or low purity soy phosphatidylserine as the lipid source.
  • the improved cochleates contain soy phosphatidylserine in an amount of about 40%-74% (preferably 45-70%, more preferably 45-55%) by weight of the lipid.
  • the improved cochleates can be empty or loaded cochleates.
  • Loaded cochleates can contain any biological actives or combination of biological actives such as, for example, a protein, a small peptide, a polynucleotide, an aminoglycoside, an antiviral agent, an anesthetic, an antibiotic, an antifungal, an anticancer, an immunosuppressant, a steroidal anti-inflammatory, a non-steroidal anti-inflammatory, a tranquilizer, a nutritional supplement, an herbal product, a vitamin or a vasodilatory agent.
  • antifungal agents or antibiotic agents are loaded into the present soy-based phosphatidylserine cochleates to provide a cost effective and improved antifungal drug/antibiotic drug with reduced toxicity.
  • Preferred antifungal agents include amphotericin-B and nystatin.
  • Preferred antibiotic agents include an aminoglycoside and amikacin.
  • the improved lipid based cochleates of the present invention can be made by a method comprising the steps of: (a) preparing liposomes in an aqueous medium wherein the liposomes have (i) a lipid bilayer comprising soy-based phosphatidylserine in an amount of about 40%-74% (preferably 45-70%, more preferably 45-55%) by weight of the lipid bilayer and (ii) a load of a biological active; (b) adding a multivalent cation to the suspension of liposomes of (a) to form the soy phosphatidylserine/biological active cochleates; and (c) collecting the soy-based phosphatidylserine/biological active cochleates.
  • the present invention also teaches that the soy phosphatidylserine/biological active cochleates can be administered to patients with fungal infections or with bacterial infections.
  • the present soy phosphatidylserine/biological active cochleates are conveniently administered orally even in the treatment of systemic fungal infections of immune compromised patients.
  • the present phosphatidylserine/biological active cochleates are also administered parenterally, or by other means of administration.
  • the preferred biological active is amphotericin-B, curcumin, and amikacin.
  • FIG. 1 shows amikacin cochleate in vitro study against MAC 101 and MAC 109 in mouse peritoneal macrophage.
  • FIG. 2 shows amikacin cochleate in vivo efficacy in a mouse model of MAC 101 infection IP-delivery.
  • FIG. 3 shows amikacin cochleate in vivo efficacy in a mouse model of MAC 101 infection oral-delivery.
  • FIG. 4 shows gentamicin encochleation related to PS properties.
  • FIG. 5 shows encochleation efficiency of amikacin bile salts related to PS properties.
  • FIG. 6 shows encochleation efficiency of amikacin bile salts related to PS properties.
  • FIG. 7 shows encochleation efficiency of gentamycin bile salts related to PS properties.
  • FIG. 8 shows encochleation efficiency of gentamycin bile salts related to PS properties.
  • FIG. 9 shows encochleation efficiency of paromomycin bile salts related to PS properties.
  • FIG. 10 shows encochleation efficiency of paromomycin bile salts related to PS properties.
  • FIG. 11 shows encochleation efficiency of paromomycin bile salts related to PS properties.
  • a “cochleate” is a stable, phospholipid-cation precipitate that can be either empty or loaded.
  • An “empty cochleate” is a cochleate that is comprised only of phospholipid and cations.
  • a “loaded cochleate” is a cochleate that has one or more biological active compounds within the phospholipid-cation structure.
  • Soy phosphatidylserine or “soy-based phosphatidylserine” is phosphatidylserine that has been derived from a soy based composition.
  • improved phospholipid based cochleates are made by using soy phosphatidylserine in an amount of 40%-74% by weight of the lipid component of the cochleates.
  • the soy phosphatidylserine can be about 40%, 45%, 50%, 55%, 60%, 65%, or 70%, or any incremental value thereof, by weight of the lipid component of the cochleates. It is to be understood that all values, and ranges between these values and ranges are meant to be encompassed by the present invention.
  • the phospholipid comprises 45-70% soy phosphatidylserine.
  • the phospholipid comprises 45-55% soy phosphatidylserine.
  • Phosphatidic acid is a preferred phospholipid when there is an additional phospholipid besides phosphatidylserine in the presently improved cochleates.
  • Other phospholipids in addition to phosphatidic acid that can be used in the presently improved cochleates include phosphatidylcholine, phosphatidylinositol and phosphatidylglycerol. Mixtures of the additional phospholipids can also be used in combination with the soy phosphatidylserine.
  • soy phosphatidylserine starting material is commercially available, or can be purified from soy phospholipid composition, which are mixtures of several soy phospholipids, according to well known and standard purification techniques.
  • any multivalent compound can be used to precipitate the cochleates from the liposome starting materials.
  • the multivalent compounds are divalent cations such as Ca ++ , Zn ++ , Ba ++ , and Mg ++ .
  • Preferred sources of these cations include the chloride salts of calcium, zinc, barium, and magnesium.
  • CaCl 2 is a particularly preferred source of divalent cations.
  • the present soy phosphatidylserine cochleates may further comprise bile salts.
  • the weight ratio of soy-based phospholipid to the bile salts is between 20:1 and 0.5:1, preferably, between 10:1 and 3:1.
  • Bile salts are bile acids compounded with a cation, usually sodium. Bile acids are steroid acids found predominantly in the bile of mammals. Bile salts are commercially available (for example, Sigma Aldrich catalog #48305 Fluka cholic acid sodium salt, 50% deoxycholic acid sodium salt, 50%).
  • soy phosphatidylserine cochleates of the present invention are more efficient at encochleating than cochleates containing at least about 75% soy phosphatidylserine.
  • lipid bilayer comprising soy-based phosphatidylserine in an amount of about 40%-74% (preferably 45-70%, more preferably 45-55%) by weight of the lipid bilayer and (ii) a load of a biological active;
  • the aqueous medium containing the suspension of liposome is a buffered environment having a pH of 6.5-7.5, and the load of the biological active is at pH 10 or higher prior to addition to the liposomes.
  • the suspension of liposomes is buffered with phosphate.
  • the method further comprises a step of adding bile salts to the suspension of liposomes of (a) before step (b) or adding bile salts to the soy-based phosphatidylserine/biological active cochleates after step (b), wherein the weight ratio of the lipid bilayer to the bile salts is between 20:1 and 0.5:1, preferably, between 10:1 and 3:1.
  • the present invention provides a geodate composition which contains (1) a lipid monolayer including a soy-based phospholipid that comprises about 40%-74% (preferably 45-70%, more preferably 45-55%) by weight soy phosphatidylserine, disposed about a hydrophobic domain; and (2) a lipid strata disposed about the lipid monolayer, wherein the lipid strata comprises a structure of alternating cationic layers comprising a divalent cation and negatively charged lipid sheet-like layers; and a cargo moiety associated with the hydrophobic domain.
  • the bioactive active/drug can be hydrophobic in aqueous media, hydrophilic or amphiphilic.
  • the drug can be, but is not limited to, a protein, a small peptide, a bioactive polynucleotide, an antifungal agent, an antiviral agent, an anesthetic, an anti-infectious agent, an antifungal agent, an anticancer agent, an immunosuppressant, a steroidal anti-inflammatory, a nutritional supplement, an herbal product, a vitamin, a non-steroidal anti-inflammatory, a tranquilizer or a vasodilatory agent.
  • Examples include Amphotericin B, acyclovir, adriamycin, vitamin A, cabamazepine, melphalan, nifedipine, indomethacin, naproxen, estrogens, testosterones, steroids, phenytoin, ergotamines, cannabinoids rapamycin, propanidid, propofol, alphadione, echinomycine, miconazole nitrate, teniposide, taxanes, paclitaxel, and taxotere.
  • the drug can be a polypeptide such as cyclosporin, angiotensin I, II and III, enkephalins and their analogs, ACTH, anti-inflammatory peptides I, II, III, bradykinin, calcitonin, b-endorphin, dinorphin, leucokinin, leutinizing hormone releasing hormone (LHRH), insulin, neurokinins, somatostatin, substance P, thyroid releasing hormone (TRH) and vasopressin.
  • polypeptide such as cyclosporin, angiotensin I, II and III, enkephalins and their analogs, ACTH, anti-inflammatory peptides I, II, III, bradykinin, calcitonin, b-endorphin, dinorphin, leucokinin, leutinizing hormone releasing hormone (LHRH), insulin, neurokinins, somatostatin, substance P, thyroid releasing hormone (TRH) and vasopressin.
  • the drug can be an antigen, but is not limited to a protein antigen.
  • the antigen can also be a carbohydrate or DNA.
  • antigenic proteins include envelope glycoproteins from influenza or Sendai viruses, animal cell membrane proteins, plant cell membrane proteins, bacterial membrane proteins and parasitic membrane proteins.
  • the antigen is extracted from the source particle, cell, tissue, or organism by known methods. Biological activity of the antigen need not be maintained. However, in some instances (e.g., where a protein has membrane fusion or ligand binding activity or a complex conformation which is recognized by the immune system), it is desirable to maintain the biological activity. In these instances, an extraction buffer containing a detergent which does not destroy the biological activity of the membrane protein is used. Suitable detergents include ionic detergents such as cholate salts, deoxycholate salts and the like or heterogeneous polyoxyethylene detergents such as Tween, BRIG or Triton.
  • Utilization of this method allows reconstitution of antigens, more specifically proteins, into the liposomes with retention of biological activities, and eventually efficient association with the cochleates. This avoids organic solvents, sonication, or extreme pH, temperature, or pressure all of which may have an adverse effect upon efficient reconstitution of the antigen in a biologically active form.
  • the presently improved cochleates can include loads with multiple antigenic molecules, biologically relevant molecules or drug formularies as appropriate.
  • cochleate precipitates are repeatedly washed with a buffer containing a positively charged molecule, and more preferably, a divalent cation. Addition of a positively charged molecule to the wash buffer ensures that the cochleate structures are maintained throughout the wash step, and that they remain as precipitates.
  • the medium in which the cochleates are suspended can contain salt such as sodium chloride, sodium sulfate, potassium sulfate, ammonium sulfate, magnesium sulfate, sodium carbonate.
  • the medium can contain polymers such as Tween 80 or BRIG or Triton.
  • the drug-cochleate is made by diluting into an appropriate pharmaceutically acceptable carrier (e.g., a divalent cation-containing buffer).
  • the cochleate particles can be enteric.
  • the cochleate particles can be placed within gelatin capsules and the capsule can be enteric coated.
  • the improved soy phosphatidylserine cochleates of the present invention containing a biological active are conveniently administered to patients orally whereby the cochleates are absorbed into the bloodstream and the bioactive loads are delivered systemically.
  • This is a particular advantage for water insoluble drugs such as amphotericin-B and paclitaxel. Additionally, the toxicity of many hydrophobic drugs is substantially reduced as seen with soy phosphatidylserine cochleates containing amphotericin-B as the load.
  • Amphotericin B in 0.6 mL 0.1N NaOH was then mixed with 90 mg DOPS (from Avanti or NOF Corporation) in 3.0 mL 50 mM phosphate buffer pH 7.4 (liposome was filtered through 5 ⁇ m, 8 ⁇ m, and 4.5 ⁇ m filter) to form liposomes containing the Amphotericin B. 0.33 mL 0.5M calcium chloride solution was then added into the resultant mixture to form crystals Amphotericin B cochleates. To make nice crystalline cochleates, the lipid:Amphotericin B weight ratio was about 5:1.
  • Amphotericin B (actually 7 mg based on the potency assay with the concentration of 0.932 mg/mg)
  • 0.2 mL 0.1N NaOH solution was mixed with 50 mg of castor oil and then combined with 35 mg of 50% soy PS in 1.75 mL sterile water (liposome was filtered through 5 ⁇ m filter) to form geode liposomes containing the Amphotericin B.
  • 21 mg BSA or casein was then added into the mixture of the Amphotericin B geode liposome.
  • Amphotericin B (actually 500 mg based on the potency assay with the concentration of 0.932 mg/mg)
  • 14.3 mL 0.1N NaOH solution was then mixed with 3.57 g castor oil and then combined with 2.5 g of 50% soy PS in 125 mL sterile water (liposome was filtered through 5 ⁇ m filter) to form geode liposomes containing the Amphotericin B.
  • 1.5 g BSA or casein was then added into the mixture of geode liposome.
  • 250 mg of vitamin E in 2.5 mL ethyl alcohol was then added into the mixture of the geode liposome.
  • Geode cochleates were then concentrated using lyophilization to provide geode cochleates with sterile water in any concentrations (based on the experiment requirements) with a lipld:Amphotericin B weight ratio of about 5:1.
  • Cell lines mouse peritoneal macrophage cell line (Raw 246.7), and/or THP-1, a human macrophage cell line.
  • Cells were cultured in DMEM and RPMI-1640, respectively, supplemented with 5% heat-inactivated fetal bovine serum.
  • Macrophage monolayers were established by adding 10 5 macrophages to a 24-well tissue culture plate. After 24 hours, monolayers were infected and the infection was allowed to happen for 1 hour, and then the extracellular bacteria were removed by washing. Some of the well contents were lysed and plated onto Middlebrook 7H10 agar plate, to determine the intracellular inoculum of the bacterium.
  • the remaining wells were treated daily with different aminoglycosides (i.e., amikacin, gentamicin, and paromomycin) cochleates prepared in accordance with the claimed method. After treatment, cell monolayers were lysed and the lysate plated into 7H10 agar to quantify the intracellular load.
  • aminoglycosides i.e., amikacin, gentamicin, and paromomycin
  • aminoglycoside cochleates have enhanced efficacy against different bacteria compared to corresponding non-encochleated free drugs.
  • amikacin cochleate (Amkcch) formulations were optimized for amikacin encochleation efficiency and particle size by varying the type of PS used, the PS:biological active ratio, PS:Ca ++ ratio, and NaCl concentration.
  • the efficacy of Amkcch against intracellular Ma infections was evaluated in vitro using mouse peritoneal macrophage infected with M. avium strains MAC 101 or MAC 109 .
  • Mouse peritoneal macrophages (Mo) Raw 264.7 cells were seeded at 105 cells/well. Mo monolayers were infected at ratio 1:10 for 1 h and extracellular bacteria removed. Monolayers were treated with free amikacin and/or cochleate preparations for 4 days and the number of intracellular bacteria determined Assays were repeated three times.
  • amikacin cochleate formulations are 10-50 fold more active than free amikacin against M. avium infection in macrophage.
  • Cochleate preparations of amikacin showed significant and enhanced activity against Ma strains in macrophages, suggesting that cochleates achieved higher intracellular concentration for a longer time than free amikacin.
  • amikacin cochleates A formation of amikacin cochleates has been developed.
  • the in vivo efficacy amikacin cochleats against Mycobacterium avium complex (MAC) was evaluated using C57BL/6 black mice.
  • amikacin cochleates As demonstrated in FIGS. 2 and 3 , amikacin cochleates, given I.P. or orally, were active, reducing the number of bacterial load in the spleen.
  • the amikacin cochleate preparation with high salt concentration does orally was Conclusion: Oral delivery of Amikacin cochleate formulations demonstrates in vivo efficacy similar to IP free amikacin.
  • Encochleation percentage is determined by measuring the amount of amikacin in the supernatant (ninhydrin assay) after forming the cochleates and then centrifuging. The amount in the supernatant is then subtracted from the total amount during the encochleation process. This is reported as percent in supt. The lower the percent in supernatant the higher the encochleation efficiency. The results listed in Table 2 clearly demonstrate that 50% soy PS is more efficient at encochleating than 85% PS.
  • Encochleation percentage is determined by measuring the amount of amikacin in the supernatant (ninhydrin assay) after forming the cochleates and then centrifuging. The amount in the supernatant is then subtracted from the total amount during the encochleation process. This is reported as percent in supt. The lower the percent in supernatant the higher the encochleation efficiency. The results listed in Table 3 clearly demonstrate that 50% soy PS is more efficient at encochleating than 85% PS.
  • Encochleation percentage is determined by measuring the amount of amikacin in the supernatant (ninhydrin assay) after forming the cochleates and then centrifuging. The amount in the supernatant is then subtracted from the total amount during the encochleation process. This is reported as percent in supt. The lower the percent in supernatant the higher the encochleation efficiency. The results listed in Table 4 clearly demonstrate that 50% soy PS is more efficient at encochleating than 99.99% PS.
  • FIG. 4 shows Gentamicin Encochleation Related to PS Properties. Similar to Tables 1-3, the results listed in FIG. 4 clearly demonstrate that 50% soy PS is more efficient at encochleating gentamicin at lower bile salt concentrations than 85% PS or 99.99% PS.
  • Aminoglycoside 2 mg in 0.2 ml sterile water was filtered through a 0.22 ⁇ m filter and combined with 20 mg of 50% soy PS liposome in 2.0 ml sterile water (the soy PS liposome was first filtered through 5, 0.8 and 0.45 ⁇ m filters) to form liposomes containing the aminoglycoside.
  • 0.159 ml of 0.1M calcium chloride was then added with vigorous mixing to form aminoglycoside cochleates.
  • 20.4 mg bile salts were then added to the mixture of the aminoglycoside cochleates.
  • the mixture was then adjusted to a drug concentration of the aminoglycoside at 0.5 mg/ml with the buffer as the suspension.
  • the final aminoglycoside cochleate formulations contained 11.3 mM.
  • Aminoglycoside 2 mg in 0.2 ml sterile water was filtered through a 0.22 ⁇ m filter and combined with 20 mg of 50% soy PS liposome in 2.0 ml sterile water (the soy PS liposome was first filtered through 5, 0.8 and 0.45 ⁇ m filters) to form liposomes containing the aminoglycoside.
  • 0.159 ml of 0.1M calcium chloride was then added with vigorous mixing to form aminoglycoside cochleates.
  • 13.6 mg bile salts were then added to the mixture of the aminoglycoside cochleates.
  • the mixture was then adjusted to a drug concentration of the aminoglycoside at 0.5 mg/ml with the buffer as the suspension.
  • the final aminoglycoside cochleate formulations contained 7.8 mM.
  • Aminoglycoside 2 mg in 0.2 ml sterile water was filtered through a 0.22 ⁇ m filter and combined with 20 mg of 50% soy PS liposome in 2.0 ml sterile water (the soy PS liposome was first filtered through 5, 0.8 and 0.45 ⁇ m filters) to form liposomes containing the aminoglycoside.
  • 0.159 ml of 0.1M calcium chloride was then added with vigorous mixing to form aminoglycoside cochleates.
  • 6.8 mg bile salts were then added to the mixture of the aminoglycoside cochleates.
  • the mixture was then adjusted to a drug concentration of the aminoglycoside at 0.5 mg/ml with the buffer as the suspension.
  • the final aminoglycoside cochleate formulations contained 3.9 mM.
  • Aminoglycoside 2 mg in 0.2 ml sterile water was filtered through a 0.22 ⁇ m filter and combined with 20 mg of 50% soy PS liposome in 2.0 ml sterile water (the soy PS liposome was first filtered through 5, 0.8 and 0.45 ⁇ m filters) to form liposomes containing the aminoglycoside.
  • 0.159 ml of 0.1M calcium chloride was then added with vigorous mixing to form aminoglycoside cochleates.
  • 3.4 mg bile salts were then added to the mixture of the aminoglycoside cochleates.
  • the mixture was then adjusted to a drug concentration of the aminoglycoside at 0.5 mg/ml with the buffer as the suspension.
  • the final aminoglycoside cochleate formulations contained 1.95 mM.
  • Aminoglycoside 2 mg in 0.2 ml sterile water was filtered through a 0.22 ⁇ m filter and combined with 20 mg of 50% soy PS liposome in 2.0 ml sterile water (the soy PS liposome was first filtered through 5, 0.8 and 0.45 ⁇ m filters) to form liposomes containing the aminoglycoside.
  • 0.159 ml of 0.1M calcium chloride was then added with vigorous mixing to form aminoglycoside cochleates.
  • 1.7 mg bile salts were then added to the mixture of the aminoglycoside cochleates.
  • the mixture was then adjusted to a drug concentration of the aminoglycoside at 0.5 mg/ml with the buffer as the suspension.
  • the final aminoglycoside cochleate formulations contained 0.97 mM.
  • Aminoglycoside 2 mg in 0.2 ml sterile water was filtered through a 0.22 ⁇ m filter and combined with 20 mg of 50% soy PS liposome in 2.0 ml sterile water (the soy PS liposome was first filtered through 5, 0.8 and 0.45 ⁇ m filters) to form liposomes containing the aminoglycoside.
  • 20.4 mg bile salts were then added to the mixture of the aminoglycoside liposomes.
  • 0.159 ml of 0.1M calcium chloride was then added with vigorous mixing to form aminoglycoside cochleates.
  • the mixture was then adjusted to a drug concentration of the aminoglycoside at 0.5 mg/ml with same the buffer as the suspension.
  • the final aminoglycoside cochleate formulations contained 11.3 mM.
  • Aminoglycoside 2 mg in 0.2 ml sterile water was filtered through a 0.22 ⁇ m filter and combined with 20 mg of 50% soy PS liposome in 2.0 ml sterile water (the soy PS liposome was first filtered through 5, 0.8 and 0.45 ⁇ m filters) to form liposomes containing the aminoglycoside.
  • 13.6 mg bile salts were then added to the mixture of the aminoglycoside liposomes.
  • 0.159 ml of 0.1M calcium chloride was then added with vigorous mixing to form aminoglycoside cochleates.
  • the mixture was then adjusted to a drug concentration of the aminoglycoside at 0.5 mg/ml with the buffer as the suspension.
  • the final aminoglycoside cochleate formulations contained 7.8 mM.
  • Aminoglycoside 2 mg in 0.2 ml sterile water was filtered through a 0.22 ⁇ m filter and combined with 20 mg of 50% soy PS liposome in 2.0 ml sterile water (the soy PS liposome was first filtered through 5, 0.8 and 0.45 ⁇ m filters) to form liposomes containing the aminoglycoside.
  • 6.8 mg bile salts were then added to the mixture of the aminoglycoside liposomes.
  • 0.159 ml of 0.1M calcium chloride was then added with vigorous mixing to form aminoglycoside cochleates.
  • the mixture was then adjusted to a drug concentration of the aminoglycoside at 0.5 mg/ml with the buffer as the suspension.
  • the final aminoglycoside cochleate formulations contained 3.9 mM.
  • Aminoglycoside 2 mg in 0.2 ml sterile water was filtered through a 0.22 ⁇ m filter and combined with 20 mg of 50% soy PS liposome in 2.0 ml sterile water (the soy PS liposome was first filtered through 5, 0.8 and 0.45 ⁇ m filters) to form liposomes containing the aminoglycoside.
  • 3.4 mg bile salts were then added to the mixture of the aminoglycoside liposomes.
  • 0.159 ml of 0.1M calcium chloride was then added with vigorous mixing to form aminoglycoside cochleates.
  • the mixture was then adjusted to a drug concentration of the aminoglycoside at 0.5 mg/ml with the buffer as the suspension.
  • the final aminoglycoside cochleate formulations contained 1.95 mM.
  • Aminoglycoside 2 mg in 0.2 ml sterile water was filtered through a 0.22 ⁇ m filter and combined with 20 mg of 50% soy PS liposome in 2.0 ml sterile water (the soy PS liposome was first filtered through 5, 0.8 and 0.45 ⁇ m filters) to form liposomes containing the aminoglycoside.
  • the soy PS liposome was first filtered through 5, 0.8 and 0.45 ⁇ m filters
  • 1.7 mg bile salts were then added to the mixture of the aminoglycoside liposomes.
  • 0.159 ml of 0.1M calcium chloride was then added with vigorous mixing to form aminoglycoside cochleates.
  • the mixture was then adjusted to a drug concentration of the aminoglycoside at 0.5 mg/ml with the buffer as the suspension.
  • the final aminoglycoside cochleate formulations contained 0.97 mM.
  • FIGS. 5-11 show encochleation efficiency of aminoglycoside bile salts, including amikacin bile salts, gentamycin bile salts, and paromomycin bile salts.
  • Encochleation percentage is determined by measuring the amount of aminoglycoside bile salts in the supernatant (ninhydrin assay) after forming the cochleates and then centrifuging. The amount in the supernatant is then subtracted from the total amount during the encochleation process.

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