US20050276854A1 - Bioimplant formulation - Google Patents
Bioimplant formulation Download PDFInfo
- Publication number
- US20050276854A1 US20050276854A1 US11/041,270 US4127005A US2005276854A1 US 20050276854 A1 US20050276854 A1 US 20050276854A1 US 4127005 A US4127005 A US 4127005A US 2005276854 A1 US2005276854 A1 US 2005276854A1
- Authority
- US
- United States
- Prior art keywords
- pore
- formulations
- active agent
- deslorelin
- formulation according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 109
- 238000009472 formulation Methods 0.000 title claims abstract description 103
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 53
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- 239000013543 active substance Substances 0.000 claims abstract description 48
- DCXXMTOCNZCJGO-UHFFFAOYSA-N Glycerol trioctadecanoate Natural products CCCCCCCCCCCCCCCCCC(=O)OCC(OC(=O)CCCCCCCCCCCCCCCCC)COC(=O)CCCCCCCCCCCCCCCCC DCXXMTOCNZCJGO-UHFFFAOYSA-N 0.000 claims abstract description 44
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- GJKXGJCSJWBJEZ-XRSSZCMZSA-N Deslorelin Chemical compound CCNC(=O)[C@@H]1CCCN1C(=O)[C@H](CCCN=C(N)N)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](NC(=O)[C@H](CC=1C=CC(O)=CC=1)NC(=O)[C@H](CO)NC(=O)[C@H](CC=1C2=CC=CC=C2NC=1)NC(=O)[C@H](CC=1NC=NC=1)NC(=O)[C@H]1NC(=O)CC1)CC1=CNC2=CC=CC=C12 GJKXGJCSJWBJEZ-XRSSZCMZSA-N 0.000 claims description 50
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Images
Classifications
-
- 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
- A61K9/0012—Galenical forms characterised by the site of application
- A61K9/0019—Injectable compositions; Intramuscular, intravenous, arterial, subcutaneous administration; Compositions to be administered through the skin in an invasive manner
- A61K9/0024—Solid, semi-solid or solidifying implants, which are implanted or injected in body tissue
-
- 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
- A61K9/70—Web, sheet or filament bases ; Films; Fibres of the matrix type containing drug
Definitions
- the present invention relates to pharmaceutical and/or veterinary formulations for the sustained release of at least one active agent.
- Preferred active agents include gonadotropin-releasing hormone (GnRH) agonists (e.g. deslorelin), GnRH antagonists (e.g. cetrorelix), somatostatin analogues (e.g. somatostatin-14 and octreotide), lipid lowering agents (e.g. simvastatin), cyclosporins (e.g. cyclosporin A), angiotensin converting-enzyme inhibitors (e.g. captopril), calcitonins, substance P antagonists, painkillers (e.g. morphine), opioid antagonists (e.g. naltrexone), anti-depressants (e.g. venlafaxine) and non-steroidal anti-inflammatory agents (e.g. naproxen sodium).
- GnRH gonadotropin-releasing hormone
- compositions capable of controllably releasing active agents for sustained periods (e.g. up to 6 months or more).
- Types of pharmaceutical agents that would particularly benefit from the development of such formulations are those which are typically administered by patients themselves over long periods (e.g. insulin for diabetes treatment, and gonadotropin-releasing hormone (GnRH) agonists for reproductive control and treatment of sex hormone-dependent diseases and conditions) and require high levels of patient compliance.
- sustained release formulations would reduce the stress often caused to the animal and veterinarian/owner alike by the need for repeated administration of active agents.
- sustained release of at least one active agent in humans and other animals for periods of 7 days up to about 2 years can be achieved by using a solid formulation comprising stearin as an excipient in combination with a substance which, while not wishing to be bound by theory, appears to form pores and/or cracks in the excipient to enable the release of the active agent(s).
- the present invention provides a pharmaceutical and/or veterinary formulation comprising about 2-30% (w/w) (on an active basis) of at least one active agent, about 0.5-20.0% (w/w) of a pore-forming agent and the balance stearin.
- the formulation comprises about 5-10% (w/w) (on an active basis) of at least one active agent, about 1.0-10.0% (w/w) of a pore-forning agent and the balance stearin.
- the formulation comprises about 5-10% (wlw) (on an active basis) of at least one active agent, about 2.0-5.0% (w/w) of a pore-forming agent and the balance stearin.
- the present invention provides a method of treating a disease or condition in a human or other animal, the method comprising administering to the human or other animal the formulation of the first aspect of the invention.
- the at least one active agent utilised in the formulation of the present invention may be selected from agents having pharmaceutical or veterinary significance and may be any or a combination of peptides (e.g. hormones and antigens), polypeptides and proteins, and nucleic acid compounds and derivatives such as DNA and RNA
- Preferred active agents include:
- GnRH peptide agonists are deslorelin (described in U.S. Pat. No. 4,218,439), eulexin (described in FR7923545, WO 86/01105 and PT100899), goserelin (described in U.S. Pat. No. 4,100,274, U.S. Pat. No. 4,128,638, GB9112859 and GB9112825), leuprolide (described in U.S. Pat. No. 4,490,291, U.S. Pat. No. 3,972,859, U.S. Pat. No. 4,008,209, U.S. Pat. No. 4,005,063, DE2509783 and U.S. Pat. No.
- GnRH agonists are goserelin, deslorelin, leuprorelin, triptorelin, meterelin, buserelin, histrelin, nafarelin and combinations thereof.
- the formulae of these compounds are provided below:
- Formulations according to the invention which include a GnRH agonist as the at least one active agent may be used for controlling reproductive function or for the treatment of any disease or condition wherein reduction of sex hormone (i.e. testosterone or estradiol) levels over a prolonged period is beneficial.
- sex hormone i.e. testosterone or estradiol
- Examples include prostrate cancer, ovarian and breast cancer, benign hormone-dependent disorders such as endometriosis, myoma and premenstrual tension, uterine fibroids, induction of endometrial atrophy prior to surgery, suppression of germ cell activity in chemotherapy, hirsutism, cyclic auditory dysfunction, porphyria and precocious puberty ill children, benign prostatic hypertension in dogs and for use in other conditions where castration is known to have a beneficial clinical effect, including restoration of T cell-mediated immunity.
- benign hormone-dependent disorders such as endometriosis, myoma and premenstrual tension, uterine fibroids, induction of endometrial atrophy prior to surgery, suppression of germ cell activity in chemotherapy, hirsutism, cyclic auditory dysfunction, porphyria and precocious puberty ill children
- GnRH antagonists are ramorelix (L-prolone,1-(N2-(N-(N-(N-(N-(N-(N-(N-(N-acetyl-3-(2-naphhthalenyl)-D-alanyl)-4-chloro-D-phenylalanyl)-D-tryptophyl)-L-seryl)-L-tyrosyl-O-(6-deoxy-alpha-L-manntopyranosyl)-D-seryl)-L-leucyl)-L-arginyl)-2-(aminoacrbonyl)hyrazide, teverelix (D-alaninamide,N-acetyl-3-(2-naphthalenyl)-D-alayl-4-chloro-D-phenylalanyl-3-(3-pyridinyl)-D-alanyl-L-seryl-L-ty
- GnRH antagonists are described in U.S. Pat. No. 5,110,904, U.S. Pat. No. 5,300,492, U.S. Pat. No. 5,807,983, U.S. Pat. No. 5,169,932, U.S. Pat No. 5,296,468 and U.S. Pat. No. 5,502,035.
- somatostatin analogues include somatostatin-14, octreotide, lanreotide and angiopeptin cyclopeptides (U.S. Pat. No. 5,569,647).
- Formulations according to the invention which include a somatostatin analogue as the at least one active agent may be used for treating, for example, hyperinsulinaemia and peptic ulcers.
- Particularly preferred lipid lowering agents include compounds which inhibit HMG CoA reductase such as cerevastatin, mevastatin, simvastatin, pravastatin and lovastatin.
- Formulations according to the invention which includes these agents may be used for treating, for example, hyperlipoproteineamia.
- cyclosporins include naturally occurring cyclospolins (e.g. as described by Dreyfuss et al., (1976) Europ. J. Appl. Microbiol. Vol. 3: 125-133), and analogues (e.g. as described by Wenger R. M. (1982), Chemistry of Cyclosporin A in “Cyclosporin “A”, White D. G. G. ed., Amsterdam; Elsevier).
- Formulations according to the invention which include a cyclosporin or cyclosporin analogue as the at least one active agent may be used, for example, as immunosuppressive agents for prophylaxis and treatment of organ rejection in allogeneic transplants.
- Preferred ACE inhibitors include captopril, enalapril, trandolaprilate, perindoprilate, quinaprilate, fasidotril, omapatrilate and lisinopril.
- Formulations according to the invention which include such agents may be used, for example, as antihypertensives.
- Preferred calcitonins include human, salmon, and porcine calcitonin. Analogues of these polypeptides may also be suitable.
- Formulations according to the invention which include calcitonin or calcitonin analogues may be used for treatment of, for example, hypercalcemia and for decreasing concentrations of phosphate in patients suffering from hyperparathyroidism, vitamin D intoxication, and osteolytic bone metastases.
- Preferred substance P antagonists include fragment 4-11 (i.e. Pro-Gln-Gln-Phe-Phe-Gly-Leu-Met-NH 2 and variant forms), fragment 5-11 (i.e. Gln-Gln-Phe-Phe-Gly-Leu-Met-NH 2 and variant forms), fragment 6-11 (i.e. Gln-Phe-Phe-Gly-Leu-Met-NH 2 and variant forms), fragment 7-11 (i.e. Phe-Phe-Gly-Leu-Met-NH 2 ), fragment 8-11 (i.e. Phe-Gly-Leu-Met-NH 2 ) and fragment 9-11 (i.e. Gly-Leu-Met-NH 2 ).
- Other suitable substance P antagonists include those described in the present applicant's co-pending Australian Provisional Patent Application No. PP9008.
- Formulations according to the invention which include substance P antagonists may be used for treatment of cancer including chemotherapy-induced nausea and vomiting, pain, allergy, asthma, inflammatory conditions including inflammatory bowel disease and depression.
- Preferred painkillers include opioids such as morphine, levorphanol and meperidine (pethidine), and amide local anaesthetics such as bupivacaine, lidocaine, etidocaine and mepivacaine.
- opioids such as morphine, levorphanol and meperidine (pethidine)
- amide local anaesthetics such as bupivacaine, lidocaine, etidocaine and mepivacaine.
- Formulations according to the invention which include such painkilling agents may be used to treat acute pain (e.g. such as that experienced by hip replacement patients) or chronic regional pain.
- Preferred opioid antagonists include naltrexone, naloxone and methadone.
- Formulations according to the invention which include opioid antagonists may be used for treatment of opioid dependency.
- Preferred anti-depressants include venlafaxine, triflupromazine, methotrimeprazine, promethazine, buspirone, gepirone and fluoxetine (Prozac).
- Preferred non-steroidal anti-inflammatory agents include naproxen sodium indomethacin, sulindac, tolmelin, acemetacin, zomepirac, mefenamic acid, fenoprofen, flufenamic acid, phenylbutazone, flurbiprofen, ketoprofen and axsain.
- Formulations according to the invention which include non-steroidal anti-inflammatory agents may be used for the treatment of post-operative inflammation and inflammation associated with, for example, rheumatoid arthritis.
- Suitable active agents include paroxetine for treatment of social anxiety disorder/social phobia, galanin antagonists such as galanin fragment 1-13-Pro-Pro-Ala-Leu-Ala-Leu-Ala amide and galanin (1-13)-spantide 1 for treatment of obesity, eating disorders, depression and pain; activin and inhibin fragments such as ⁇ -subunit fragment 1-32 and ⁇ -fragment 67-94 for fertility control; adrenocorticotropic hormone (ACTH) and variants and fragments for treatment of West Syndrome and infantile spasms; growth hormone and its analogues for replacement therapy in growth-hormone deficient children; erythropoietin (EPO) and its analogues for treatment of anaemia; endothelin antagonists for prevention of congestive heart failure, prevention of acute renal failure and subarachnoid haemorrhage, prevention and treatment of atherosclerosis, treatment of hypertension, prevention of stroke and treatment of chronic obstructive pulmonary disease
- Vaccine antigens including DNA encoding vaccine antigens, may also be delivered in a formulation according to the present invention.
- Formulations according to the invention may include a combination of active agents. Examples of preferred combinations (comprising “Agent 1” and “Agent 2”) are shown in Table 1. TABLE 1 Agent 1 Agent 2 HMG Co A reductase inhibitor Gemfibrozil Non-steroidal anti-inflammatory agent Mycophenolate mofelil GnRH agonist Trk tyrosine inhibitor GnRH agonist Testosterone Calcitonin Estrogen Calcitonin Etridonate Calcitonin Pamridonate Octreotide ⁇ interferon Octreotide IGF-1 Octreotide Miclodrine GnRH agonist Flutamide Etofylline Theophylline
- the at least one active agent is/are of low to moderate lipophilicity. More preferably, at least one active agent has a log octanol/water partition coefficient (log P) (Ruelle and Kesselring (1998), J Pharm Sci. Vol. 87:1115-24) in the range of 5.0 to ⁇ 3.0. Most preferred are active agents having a log P value in the range of 3.0 to ⁇ 3.0 and, particularly, those having a log P value in the range of 1.0 to ⁇ 3.0.
- log P log octanol/water partition coefficient
- Log P values for representatives of the abovementioned classes of active agents are provided in Table 2.
- Table 2 Agent log octanol/water partition (log P) octreotide 1.40 cyclosporin A 2.90 captopril ⁇ 1.86 trandolaprilate 1.02 perindoprilate ⁇ 0.36 quinaprilate 0.69 morphine 0.76 lidocaine 2.26 methadone 3.93 promethazine 4.75 indomethacin 4.27 flufenamic acid 1.14 phenylbutazone 3.16 theophylline ⁇ 0.02 etofylline 0.35 TRH ⁇ 2.40
- the pore-forming agent may be any agent or combination of agents which enables the sustained release of the at least one active agent from the stearin excipient, with the proviso that when the at least one active agent is a GnRH agonist(s) the pore-forming agent is not lecithin.
- the pore-forming agent or agents is/are selected from water-soluble agents such as inorganic salts (e.g. chlorides, phosphates and sulphates), organic salts (e.g. acetates, formates, propionates, glutamates, and aspartates), sugars (e.g. glucose, trehalose, mannose, galactose, sucrose and low molecular weight carbohydrates such as hydroxy propyl methylcellulose (HPMC) and carboxy methylcellulose (CMC)), aminosugars (e.g. glucosamine and galactosamine), amino acids/peptides (e.g. lysine, arginine, glutamic acid, aspartic acid, carnosine and aspartame), water-soluble proteins and water-soluble vitamins (e.g. Vitamin B).
- inorganic salts e.g. chlorides, phosphates and sulphates
- organic salts e.g. acetates, formates, propionates
- the most preferred pore-forming agent is lecithin (except where the at least one active agent is a GnRH agonist(s)) and the amino acid lysine.
- Lecithin is a mixture of diglycerides of stearic, palmitic and oleic acids linked to the choline ester of phosphoric acid.
- the efficacy of lecithin as a pore-forming agent in a sustained release formulation comprising deslorelin and stearin is described in International patent application No. PCT/AU96/00370 (WO 97/00693), the entire disclosure of which is incorporated herein by reference.
- variation of the identity and/or amount of the pore-forming agent(s) utilised allows for the manipulation of the release profile of the active agent(s) to suit particular therapeutic uses.
- the stearin excipient is preferably in a non-crystalline form.
- Stearin is partially hydrogenated palm oil having, as the principle fatty acids, C16:0(45%) and C18:0(53%).
- the melting point of stearin is about 60° C. It is believed that the use of stearin as the excipient contributes to the success of the formulations according to the invention, because it appears, surprisingly, to produce only a minimal to mild inflammatory response in a recipient resulting in the encapsulation of the formulation within a thin layer of fibroblasts.
- the formulations according to the invention may be for administration to humans and other animals selected from dogs, cats, other domestic animals, and captive wildlife.
- the formulations will release the active agent(s), in vitro, into phosphate buffered saline (PBS: pH 7.3, prepared by dissolving 8.00 g of sodium chloride, 1.00 g di-sodium hydrogen phosphate anhydrous, 0.40 g sodium dihydrogen phosphate dihydrate (0.31 g if anydrous), and 0.05 g sodium azide in 1 litre of deionised water), at 37° C. at a rate of about 2-350 ⁇ g/day for at least 7 days and up to about 2 years.
- PBS phosphate buffered saline
- formulations will typically exist as a depot formulation for example in the form of free flowing beads or rods which may have been extruded.
- Extruded rods may be cut into predetermined lengths for implantation by standard techniques, in a human or other animal. As will be readily appreciated, the length of the rod will determine the rate and dose of the active agent(s). As opposed to implanting longer rods more than one rod can be implanted in each human or other animal. Injection of a suspension of formulated particulate material such as free flowing beads may also deliver the active agent(s) at the desired rate and dose.
- Formulations for administration as free flowing beads and/or implants, particularly to dogs, may be produced as follows:
- Stearin supplied as free flowing beads of 1 mm or less in diameter made by Vandenberg Foods
- pore-forming agent pore-forming agent
- the active agent may then be added and thoroughly mixed into the excipient and pore-forming agent mixture.
- This material may then be used for injection.
- the mixture can be transferred to the barrel of a ram extruder that has a 1 mm nozzle attached and is equilibrated to 55° C. (or other temperature sufficient to soften the stearin).
- pressure 40 psi
- the pressure can be backed off and the product allowed to reach 55° C. (or other temperature sufficient to soften the stearin).
- the product may then be extruded at, for example, a rate of 3 g over a 30 second period.
- the resulting extrudate is then allowed to cool and then broken up and re-extruded through a 1 mm nozzle to ensure uniformity of content throughout the mix.
- the 1 mm nozzle may then be replaced with a 2.3 mm diameter nozzle and the product extruded (using the same temperature equilibration procedure prior to extrusion). After cooling the long rods produced can be sectioned into lengths of the required weight and the sectioned lengths sterilised by gamma-irradiation.
- formulations for administration as bioimplants may be produced by:
- Stearin and pore-forming agent are mixed.
- the active agent may then be added and thoroughly mixed into the excipient and pore-forming agent mixture.
- the mixture can then be transferred to the barrel of an extruder that has a 2.3 mm nozzle attached and which has been equilibrated to a temperature sufficient to soften the stearin.
- the extruder is started and the product begins to extrude and the extrudate is cut to length.
- the sectioned length can be terminally sterilised.
- the at least one active agent is a peptide(s), polypeptide(s) or protein(s)
- the at least one active agent is firstly pre-treated with a process comprising at least two freeze drying steps.
- Such freeze drying steps may be conducted in accordance with any of the commonly known methods for freeze drying of proteinaceous materials. It is, however, preferred that the active agent(s) be freeze dried from a 5-50% (more preferably, 5-15%) (w/w) solution of the active agent(s) in a suitable solvent (e.g. an alcohol solution such as 30% (w/w) ethanol in water).
- freeze dried active agent(s) may then be redissolved or homogenised in a suitable solvent (e.g. 25-75% (w/w) in a diluted weak acid solution such as 1-5 % (w/w) acetic acid in water) and subsequently freeze dried again.
- a suitable solvent e.g. 25-75% (w/w) in a diluted weak acid solution such as 1-5 % (w/w) acetic acid in water
- a suitable solvent e.g. 25-75% (w/w) in a diluted weak acid solution such as 1-5 % (w/w) acetic acid in water
- step (iv) freeze drying said solution or homogenate of step (iii).
- % amount (w/w) of peptide agonist or analogue present in a formulation is based on the dry weight of the peptide agonist or analogue.
- FIG. 1 provides a graph showing average daily in vitro release profiles from three 100 mg rods of each of formulations: (I) 6% deslorelin, 2% lysine and balance stearin; and (II) 6% deslorelin, 5% lysine and balance stearin.
- the graph demonstrates an initial rapid release of the active agent and then continued release extending over a prolonged period (110 days).
- FIG. 2 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (III) 6% deslorelin, 2% sodium sulphate and balance stearin; and (IV) 6% deslorelin, 5% sodium sulphate and balance stearin.
- the graph demonstrates that a greater initial rapid release of deslorelin (534 ⁇ g vs. 438 ⁇ g) was achieved using 5% sodium sulphate as the pore-forming agent. After the initial rapid release (finished at about day 10), the rate of release was about 10-2 ⁇ g/day for the next 95 days for both formulations.
- FIG. 3 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (V) 6% deslorelin, 2% hydroxy propyl methylcellulose (HPMC) and balance stearin; and (VI) 6% deslorelin, 5% hydroxy propyl methylcellulose (HPMC) and balance stearin.
- the graph demonstrates that a much greater initial rapid release of deslorelin (685 ⁇ g vs. 403 ⁇ g) was achieved using 5% HPMC as the pore-forming agent. After the initial rapid release (finished at about day 10), the rate of release was about 10-2 ⁇ g/day for the next 95 days for both formulations.
- FIG. 4 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (VII) 6% deslorelin, 2% glucose and balance stearin; and (VM) 6% deslorelin, 5% glucose and balance stearin.
- the graph demonstrates that a much greater initial rapid release of deslorelin (790 ⁇ g vs. 403 ⁇ g) was achieved using 5% glucose as the pore-forming agent. After the initial rapid release (finished at about day 10), the rate of release was about 50-2 ⁇ g/day for the next 95 days for both formulations.
- FIG. 5 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (IX) 6% soinatostatin, 0% acetate and balance stearin; (X) 6% somatostatin, 3% acetate and balance stearin; (XI 6% soniatostatin, 5% lysine and balance stearin; and (XII) 6% somatostatin, 10% lysine and balance stearin.
- the graph demonstrates that a greater initial rapid release of somatostatin was achieved using lysine than sodium acetate as the pore-forming agent After the initial rapid release (finished at about day 2), the rate of release in all cases slowed and plateaued by day 7.
- FIG. 6 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (XIII) 6% naltrexone (NX), 0% pore forming agent and balance stearin; (XIV) 6% iialtiexone (NX), 3%/o acetate and balance stealin; (XV) 6% naltrexone (NX), 5% lysine and balance stearin: and (XVI) 6% naltiexonie (NX), 10% lysine and balance stearin.
- the graph demonstrates that a sustained gradual release of iialtrexone was achieved by all formulations over 23 days of testing, although the average daily release was low when no pore-forming agent was included.
- FIG. 7 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (XVII) 6% lisinopril, 0% sodium acetate and balance stearin; (XVIII) 6% lisinopril, 3% sodium acetate and balance stearin; (XIX) 6% lisinopril, 5% lysine and balance stearin; and (XX) 6% lisinopril, 10% lysine and balance stearin.
- the graph demonstrates that following an initial rapid release (finished at about day 1) a sustained gradual release of lisinopril was achieved by all formulations over 25 days of testing, although the average daily release of this period of sustained release was low in the case of formulation XVII (i.e. 0% pore-forming agent).
- FIG. 8 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (XXI) 6% thyrotropin releasing hormone (TRH), 0% acetate and balance stearin; (XXII) 6% thyrotropin releasing hormone (TRH), 3% acetate and balance stearin; (XXIII) 6% thyrotropiii releasing hormone (TRH), 5% lysine and balance stearin; and (XXIV) 6% thyrotropin releasing hormone (TrRH), 10% lysine and balance stearin.
- the graph demonstrates that following a very rapid initial release, a sustained gradual release of TRH was achieved with formulations XXII, XXII and XXIV over the 28 day period of of testing Where no pore-forming agent was included, no further TRH release was observed after day 1.
- FIG. 9 provides a graph showing the average daily in vitro release profile from three 100 mg rods of formulation: (XXV) 6% deslorelin, 3% sodium acetate and balance stearin. The graph demonstrates that sustained release of deslorelin over 110 days was achieved.
- Stearin supplied as free flowing beads of 1 mm or less in diameter made by Quest International Pty Ltd (Netherlands) and lecithin (supplied as a deep brown viscous syrup from Lucas Myer (Germany) were hand mixed using a spatula in a small beaker. Deslorelin (Bacheni, Switzerland) pre-treated by the above described freeze drying process, was then added and thoroughly mixed into the excipients. The mixed material was transferred to the barrel of a ram extruder that has a 1 mm nozzle attached and is equilibrated to 55° C. The ram extrusion pressure was 40 psi. The ram was attached and pressure applied until the product began to extrude.
- FIG. 1 provides results of in vitro deslorelin release with 100 mg rods containing 6 mg deslorelin.
- the assay involved immersing each rod into separate containers with 1 ml of phosphate buffered saline (PBS; as hereinbefore described) placed in a reciprocating water bath at 37° C. The PBS was replaced daily and the withdrawn PBS assayed for deslorelin with HPLC. The figure shows that after an initial rapid release of deslorelin, sustained release extending over a prolonged period (110 days) was achieved. The average daily rate of deslorelin release during the sustained release period was within the range 50-2 ⁇ g/day.
- PBS phosphate buffered saline
- Formulations III and IV were prepared with sodium sulphate (Ajax Chemicals, USA) as the pore-forming agent in the same manner as described to above for deslorelin/lysine formulations.
- FIG. 2 provides results of in vitro deslorelin release with 100 mg rods containing 6 mg deslorelin.
- the figure shows that a greater initial rapid release of deslorelin (534 ⁇ g vs. 438 ⁇ g) was achieved using a 5% concentration of sodium sulphate rather than a 2% concentration.
- the rate of release was about 10-2 ⁇ g/day for the next 95 days for both formulations.
- Formulations V and VI were prepared with hydroxy propyl methylcellulose (HPMC) as the pore-forming agent in the same manner as described above for deslorelin/lysine formulations.
- HPMC hydroxy propyl methylcellulose
- FIG. 3 provides results of in vitro deslorelin release with 100 mg rods containing 6 mg desloelin.
- the figure shows that a much greater initial rapid release of deslorelin (685 ⁇ g vs. 403 ⁇ g) was achieved using 5% PMC rather than 2% HPMC. After the initial rapid release (finished at about day 10), the rate of release was about 10-2 ⁇ g/day for the next 95 days for both formulations.
- Formulations VII and VIII were prepared with glucose (Ajax Chemicals, USA) as the pore-forming agent in the same manner as described above for deslorelin/lysine formulations.
- FIG. 4 provides results of in vitro deslorelin release with 100 mg rods, containing 6 mg deslorelin.
- the figure shows that a much greater initial rapid release of deslorelin (790 ⁇ g vs. 403 ⁇ g) was achieved using 5% glucose rather than 2% glucose as the pore-forming agent. After the initial rapid release (finished at about day 10), the rate of release was about 50-2 ⁇ g/day for the next 95 days for both formulations.
- Formulations IX to XII were prepared with sodium acetate or lysine as the pore-forming agent in a manner similar to that described above for deslorelin/lysine formulations.
- the somatostatin was obtained from Bachem (Switzerland).
- FIG. 5 provides results of in vitro somatostatin release with 100 mg rods, containing 6 mg somatostatin. The figure shows that a greater initial rapid release of somatostatin was achieved using lysine than sodium acetate as the pore-forming agent.
- Formulations XIII to XVI were prepared with sodium acetate or lysine as the pore-forming agent in a manner similar to that described above for deslorelin/lysine formulations.
- FIG. 6 provides results of in vitro naltrexone release with 100 mg rods, containing 6 mg deslorelin. The figure shows that a sustained gradual release of naltrexone was achieved by all formulations over 23 days of testing, although the average daily release was low when no pore-forming agent was included.
- Formulations XVII to XX were prepared with sodium acetate or lysine as the pore-forming agent in a manner similar to that described above for deslorelin/lysine formulations.
- the lisinopril was obtained from Sigma Chemical Co. (USA).
- FIG. 7 provides results of in vitro lisinopril release from 100 mg rods, containing 6 mg lisinopril.
- the figure shows that following an initial rapid release (finished at about day 1) a sustained gradual release of lisinopril was achieved by all formulations over 25 days of testing, although the average daily release of this period of sustained release was low in the case of formulation XVII which contains no pore-forming agent.
- Formulations XX to XXIV were prepared with sodium acetate or lysine as the pore-forming agent in a manner similar to that described above for deslorelin/lysine formulations.
- the TRH was obtained from Sigma Chemical Co (USA).
- FIG. 8 provides results of in vitro TRH release from 100 mg rods, containing 6 mg TRH. The figure shows that following a very rapid initial release, a sustained gradual release of TRH was achieved with formulations XXII, XXII and XXV over the 28 day period of of testing Where no pore-forming agent was included, no further TRH release was observed after day 1.
- Formulation XXV were prepared with sodium acetate as the pore-forming agent in the same manner as described above for deslorelin/lysine formulations.
- FIG. 9 provides results of in vitro deslorelin release with 6 mg rods. The figure shows that sustained release of deslorelin over 110 days was achieved.
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Abstract
A pharmaceutical and/or veterinary formulation comprising about 2-30% (w/w) (on an active basis) of at least one active agent, about 0.5-20.0% (w/w) of a pore-forming agent and the balance stearin. Such formulations provide sustained release of the at least one active agent in humans and other animals for periods of 7 days up to about 2 years.
Description
- The present invention relates to pharmaceutical and/or veterinary formulations for the sustained release of at least one active agent. Preferred active agents include gonadotropin-releasing hormone (GnRH) agonists (e.g. deslorelin), GnRH antagonists (e.g. cetrorelix), somatostatin analogues (e.g. somatostatin-14 and octreotide), lipid lowering agents (e.g. simvastatin), cyclosporins (e.g. cyclosporin A), angiotensin converting-enzyme inhibitors (e.g. captopril), calcitonins, substance P antagonists, painkillers (e.g. morphine), opioid antagonists (e.g. naltrexone), anti-depressants (e.g. venlafaxine) and non-steroidal anti-inflammatory agents (e.g. naproxen sodium).
- For reasons including improved efficacy of action and reduced frequency of administration, there is considerable interest in the development of pharmaceutical and veterinary formulations capable of controllably releasing active agents for sustained periods (e.g. up to 6 months or more). Types of pharmaceutical agents that would particularly benefit from the development of such formulations are those which are typically administered by patients themselves over long periods (e.g. insulin for diabetes treatment, and gonadotropin-releasing hormone (GnRH) agonists for reproductive control and treatment of sex hormone-dependent diseases and conditions) and require high levels of patient compliance. In the veterinary context, sustained release formulations would reduce the stress often caused to the animal and veterinarian/owner alike by the need for repeated administration of active agents.
- The present applicant's have found that sustained release of at least one active agent in humans and other animals for periods of 7 days up to about 2 years, can be achieved by using a solid formulation comprising stearin as an excipient in combination with a substance which, while not wishing to be bound by theory, appears to form pores and/or cracks in the excipient to enable the release of the active agent(s).
- Thus, in a first aspect, the present invention provides a pharmaceutical and/or veterinary formulation comprising about 2-30% (w/w) (on an active basis) of at least one active agent, about 0.5-20.0% (w/w) of a pore-forming agent and the balance stearin.
- In a preferred embodiment, the formulation comprises about 5-10% (w/w) (on an active basis) of at least one active agent, about 1.0-10.0% (w/w) of a pore-forning agent and the balance stearin.
- In a more preferred embodiment, the formulation comprises about 5-10% (wlw) (on an active basis) of at least one active agent, about 2.0-5.0% (w/w) of a pore-forming agent and the balance stearin.
- In a second aspect, the present invention provides a method of treating a disease or condition in a human or other animal, the method comprising administering to the human or other animal the formulation of the first aspect of the invention.
- The at least one active agent utilised in the formulation of the present invention, may be selected from agents having pharmaceutical or veterinary significance and may be any or a combination of peptides (e.g. hormones and antigens), polypeptides and proteins, and nucleic acid compounds and derivatives such as DNA and RNA
- Preferred active agents include:
- (1) GnRH Agonists
- Particularly preferred GnRH peptide agonists are deslorelin (described in U.S. Pat. No. 4,218,439), eulexin (described in FR7923545, WO 86/01105 and PT100899), goserelin (described in U.S. Pat. No. 4,100,274, U.S. Pat. No. 4,128,638, GB9112859 and GB9112825), leuprolide (described in U.S. Pat. No. 4,490,291, U.S. Pat. No. 3,972,859, U.S. Pat. No. 4,008,209, U.S. Pat. No. 4,005,063, DE2509783 and U.S. Pat. No. 4,992,421), dioxalan derivatives such as are described in EP 413209, triptorelin (described in U.S. Pat. No. 4,010,125, U.S. Pat. No. 4,018,726, U.S. Pat. No. 4,024,121, EP 364819 and U.S. Pat. No. 5,258,492), meterelin (described in EP 23904), buserelin (described in U.S. Pat. No. 4,003,884, U.S. Pat. No. 4,118,483 and U.S. Pat. No. 4275001), histrelin (described in EP217659), nafarelin (described in U.S. Pat. No. 4,234,571, W093/15722 and EP52510), lutrelin (described in U.S. Pat. No. 4,089,946), leuprorelin (described in Plosker et al., Drugs 48 930-967, 1994) and LHRH analogues such as are described in EP181236, U.S. Pat. No. 4,608,251, U.S. Pat. No. 4,656,247, U.S. Pat. No. 4,642,332, U.S. Pat. No. 4,010,149, U.S. Pat. No. 3,992,365 and U.S. Pat. No. 4,010,149. The disclosures of each the patent specifications and papers referred to above are incorporated herein by reference.
- The most preferred GnRH agonists are goserelin, deslorelin, leuprorelin, triptorelin, meterelin, buserelin, histrelin, nafarelin and combinations thereof. The formulae of these compounds are provided below:
-
- Goserelin C59H84N18O14C2H4O2 D-Ser(But)6Azgly10-LHRH Acetate 3-[5-oxo-L-prolyl-L-tryptophyl-L-seryl-L-tyrosyl-(3-O-tert-butyl)-D-seryl-L-leucyl-L-arginyl-L-prolyl]cabazamide acetate.
- Deslorelin G-D-tryptophan-9-(N-ethyl-L prolinamide)-10-deglycinamide P Glutamine-Histidine-Tryptophan-Serine-Tyrosine-D Tryptophan-Leucine-Arginine-Proline-ethylamide.
- Leuprorelin C59H84N16O12, C2H4O2 Leuprorelin Acetate 5-oxo-L-prolyl-L-histidyl-L-tryptophyl-L-seryl-L-tyrosyl-D-leucyl-L-arginyl-N-ethyl-L-prolinamide acetate.
- Triptorelin C59H84N10O12, C2H4O2 D-Trp6-LHRH 5-oxo-L-prolyl-L-histidyl-L-tryptophyl-L-seryl-L-tyrosyl-D-tryptophyl-L-leucyl-L-arginyl-L-prolylglycinamide.
- Meterelin Des Gly10-2-methyl-D-Trp6-Pro-ethyl-amide9 LHRH.
- Buserelin C60H86N16O13, C2H4O2 D-Ser(But)8-Pro9-NEt LHRH Acetate Oxo-L-prolyl-L-histidyl L-tryptophyl-L-seryl-L-tyrosyl-O-tert-butyl-D-seryl-L-leucyl-L-arginyl-N-ethyl-L-prolinamide acetate.
- Histrelin Pro-His-Trp-Ser-Tyr-Leu-D(N-benzyl)His-Arg-Pro-N-ethylamide.
- Nafarelin C66H83N17O13, xC2H4O2yH2OOxo-L-prolyl-L-histidyl-L-tryptophyl-L-seryl-L-tyrosyl-3-(2-naphthyl)-D-alanyl-L-leucyl-L-arginyl-N-ethyl-L-prolylglycinamide acetate hydrate.
- Formulations according to the invention which include a GnRH agonist as the at least one active agent may be used for controlling reproductive function or for the treatment of any disease or condition wherein reduction of sex hormone (i.e. testosterone or estradiol) levels over a prolonged period is beneficial. Examples include prostrate cancer, ovarian and breast cancer, benign hormone-dependent disorders such as endometriosis, myoma and premenstrual tension, uterine fibroids, induction of endometrial atrophy prior to surgery, suppression of germ cell activity in chemotherapy, hirsutism, cyclic auditory dysfunction, porphyria and precocious puberty ill children, benign prostatic hypertension in dogs and for use in other conditions where castration is known to have a beneficial clinical effect, including restoration of T cell-mediated immunity.
- (2) GnRH Antagonists
- Particularly preferred GnRH antagonists are ramorelix (L-prolone,1-(N2-(N-(N-(N-(N-(N-(N-(N-acetyl-3-(2-naphhthalenyl)-D-alanyl)-4-chloro-D-phenylalanyl)-D-tryptophyl)-L-seryl)-L-tyrosyl-O-(6-deoxy-alpha-L-manntopyranosyl)-D-seryl)-L-leucyl)-L-arginyl)-2-(aminoacrbonyl)hyrazide, teverelix (D-alaninamide,N-acetyl-3-(2-naphthalenyl)-D-alayl-4-chloro-D-phenylalanyl-3-(3-pyridinyl)-D-alanyl-L-seryl-L-tyrosyl-N6-(aminocarbonyl)-D-lysyl-L-leucyl-N6-(1-methylethyl)-L-lysyl-L-prolyl, cetrorelix (D-Alaninamode, N-acetyl-3-(2-naphthalenyl)-D-alanyl-4-chloro-D-phenylalanyl-3-(3-pyridinyl)-D-alanyl-L-seryl-L-tyrosyl-N5-(aminocarbonyl)-D-ol-L-leucyl-L-arginyl-L-prolyl, ganirelix (N—Ac-D-Nal,D-pCl-Phe,D-Pal,DhArg(Et)2,hArg(Et)2,D-Ala) GnRH, alanex, abarelix (D-Alaninamide,N-acetyl-3-(2-naphthalenyl)-D-alanyl-4-chloro-D-phenylalanyl-3-(3-pyridinyl)-D-alanyl-L-seryl-N-methyl-L-tyrosyl-D-asparainyl-L-leucyl-N6-(1-methylethyl)-L-lysyl-L-prolyl; N—(S)-tetrahydrofuroyl-Gly-D2Nal-D4Ciphe-D3Pal-Ser-NmeTyr-D-lys(Nic)-Leu-Lys(Isp)-Pro-D-Ala-NH2; isopropyl-13-(N-benzyl-N-methaminomethyl)-7-(2,6-diflurobenzyl)-4,7-dihydro-2-(4-isobutyrylaminophenyl)-4-oxothieno(2,3-b)pyridine-5-carboxyatehydrochloride). Other preferred GnRH antagonists are described in U.S. Pat. No. 5,110,904, U.S. Pat. No. 5,300,492, U.S. Pat. No. 5,807,983, U.S. Pat. No. 5,169,932, U.S. Pat No. 5,296,468 and U.S. Pat. No. 5,502,035.
- (3) Somatostatin Analogues
- Particularly preferred somatostatin analogues include somatostatin-14, octreotide, lanreotide and angiopeptin cyclopeptides (U.S. Pat. No. 5,569,647).
- Formulations according to the invention which include a somatostatin analogue as the at least one active agent may be used for treating, for example, hyperinsulinaemia and peptic ulcers.
- (4) Lipid Lowering Agents
- Particularly preferred lipid lowering agents include compounds which inhibit HMG CoA reductase such as cerevastatin, mevastatin, simvastatin, pravastatin and lovastatin.
- Formulations according to the invention which includes these agents may be used for treating, for example, hyperlipoproteineamia.
- (5) Cyclosporins
- Preferred cyclosporins include naturally occurring cyclospolins (e.g. as described by Dreyfuss et al., (1976) Europ. J. Appl. Microbiol. Vol. 3: 125-133), and analogues (e.g. as described by Wenger R. M. (1982), Chemistry of Cyclosporin A in “Cyclosporin “A”, White D. G. G. ed., Amsterdam; Elsevier).
- Formulations according to the invention which include a cyclosporin or cyclosporin analogue as the at least one active agent may be used, for example, as immunosuppressive agents for prophylaxis and treatment of organ rejection in allogeneic transplants.
- (6) Angiotensin Converting Enzyme Inhibitors
- Preferred ACE inhibitors include captopril, enalapril, trandolaprilate, perindoprilate, quinaprilate, fasidotril, omapatrilate and lisinopril.
- Formulations according to the invention which include such agents may be used, for example, as antihypertensives.
- (7) Calcitonins
- Preferred calcitonins include human, salmon, and porcine calcitonin. Analogues of these polypeptides may also be suitable.
- Formulations according to the invention which include calcitonin or calcitonin analogues may be used for treatment of, for example, hypercalcemia and for decreasing concentrations of phosphate in patients suffering from hyperparathyroidism, vitamin D intoxication, and osteolytic bone metastases.
- (8) Substance P Antagonists
- Preferred substance P antagonists include fragment 4-11 (i.e. Pro-Gln-Gln-Phe-Phe-Gly-Leu-Met-NH2 and variant forms), fragment 5-11 (i.e. Gln-Gln-Phe-Phe-Gly-Leu-Met-NH2 and variant forms), fragment 6-11 (i.e. Gln-Phe-Phe-Gly-Leu-Met-NH2 and variant forms), fragment 7-11 (i.e. Phe-Phe-Gly-Leu-Met-NH2), fragment 8-11 (i.e. Phe-Gly-Leu-Met-NH2) and fragment 9-11 (i.e. Gly-Leu-Met-NH2). Other suitable substance P antagonists include those described in the present applicant's co-pending Australian Provisional Patent Application No. PP9008.
- Formulations according to the invention which include substance P antagonists may be used for treatment of cancer including chemotherapy-induced nausea and vomiting, pain, allergy, asthma, inflammatory conditions including inflammatory bowel disease and depression.
- (9) Painkillers
- Preferred painkillers include opioids such as morphine, levorphanol and meperidine (pethidine), and amide local anaesthetics such as bupivacaine, lidocaine, etidocaine and mepivacaine.
- Formulations according to the invention which include such painkilling agents may be used to treat acute pain (e.g. such as that experienced by hip replacement patients) or chronic regional pain.
- (10) Opioid Antagonists
- Preferred opioid antagonists include naltrexone, naloxone and methadone.
- Formulations according to the invention which include opioid antagonists may be used for treatment of opioid dependency.
- (11) Anti-Depressants
- Preferred anti-depressants include venlafaxine, triflupromazine, methotrimeprazine, promethazine, buspirone, gepirone and fluoxetine (Prozac).
- (12) Non-Steroidal Anti-Inflammatory Agents
- Preferred non-steroidal anti-inflammatory agents include naproxen sodium indomethacin, sulindac, tolmelin, acemetacin, zomepirac, mefenamic acid, fenoprofen, flufenamic acid, phenylbutazone, flurbiprofen, ketoprofen and axsain.
- Formulations according to the invention which include non-steroidal anti-inflammatory agents may be used for the treatment of post-operative inflammation and inflammation associated with, for example, rheumatoid arthritis.
- (13) Miscellaneous
- Other suitable active agents include paroxetine for treatment of social anxiety disorder/social phobia, galanin antagonists such as galanin fragment 1-13-Pro-Pro-Ala-Leu-Ala-Leu-Ala amide and galanin (1-13)-spantide 1 for treatment of obesity, eating disorders, depression and pain; activin and inhibin fragments such as α-subunit fragment 1-32 and β-fragment 67-94 for fertility control; adrenocorticotropic hormone (ACTH) and variants and fragments for treatment of West Syndrome and infantile spasms; growth hormone and its analogues for replacement therapy in growth-hormone deficient children; erythropoietin (EPO) and its analogues for treatment of anaemia; endothelin antagonists for prevention of congestive heart failure, prevention of acute renal failure and subarachnoid haemorrhage, prevention and treatment of atherosclerosis, treatment of hypertension, prevention of stroke and treatment of chronic obstructive pulmonary disease; leptin and its agonists and antagonists for treatment of obesity and eating disorders such as anorexia nervosa, and for weight loss; thyrotropin releasing hormone (TRH and its analogues (e.g. pGlu-His-Pro-Gly) for treatment of, for example, epilepsy; and theophylline and its analogues for the treatment of asthma, systemic capillary leak syndrome and Parkinson's disease. Vaccine antigens, including DNA encoding vaccine antigens, may also be delivered in a formulation according to the present invention.
- Formulations according to the invention may include a combination of active agents. Examples of preferred combinations (comprising “Agent 1” and “
Agent 2”) are shown in Table 1.TABLE 1 Agent 1 Agent 2HMG Co A reductase inhibitor Gemfibrozil Non-steroidal anti-inflammatory agent Mycophenolate mofelil GnRH agonist Trk tyrosine inhibitor GnRH agonist Testosterone Calcitonin Estrogen Calcitonin Etridonate Calcitonin Pamridonate Octreotide α−interferon Octreotide IGF-1 Octreotide Miclodrine GnRH agonist Flutamide Etofylline Theophylline - Preferably, the at least one active agent is/are of low to moderate lipophilicity. More preferably, at least one active agent has a log octanol/water partition coefficient (log P) (Ruelle and Kesselring (1998), J Pharm Sci. Vol. 87:1115-24) in the range of 5.0 to −3.0. Most preferred are active agents having a log P value in the range of 3.0 to −3.0 and, particularly, those having a log P value in the range of 1.0 to −3.0.
- Log P values for representatives of the abovementioned classes of active agents are provided in Table 2.
TABLE 2 Agent log octanol/water partition (log P) octreotide 1.40 cyclosporin A 2.90 captopril −1.86 trandolaprilate 1.02 perindoprilate −0.36 quinaprilate 0.69 morphine 0.76 lidocaine 2.26 methadone 3.93 promethazine 4.75 indomethacin 4.27 flufenamic acid 1.14 phenylbutazone 3.16 theophylline −0.02 etofylline 0.35 TRH −2.40 - The pore-forming agent may be any agent or combination of agents which enables the sustained release of the at least one active agent from the stearin excipient, with the proviso that when the at least one active agent is a GnRH agonist(s) the pore-forming agent is not lecithin.
- Preferably, the pore-forming agent or agents is/are selected from water-soluble agents such as inorganic salts (e.g. chlorides, phosphates and sulphates), organic salts (e.g. acetates, formates, propionates, glutamates, and aspartates), sugars (e.g. glucose, trehalose, mannose, galactose, sucrose and low molecular weight carbohydrates such as hydroxy propyl methylcellulose (HPMC) and carboxy methylcellulose (CMC)), aminosugars (e.g. glucosamine and galactosamine), amino acids/peptides (e.g. lysine, arginine, glutamic acid, aspartic acid, carnosine and aspartame), water-soluble proteins and water-soluble vitamins (e.g. Vitamin B).
- Presently, the most preferred pore-forming agent is lecithin (except where the at least one active agent is a GnRH agonist(s)) and the amino acid lysine. Lecithin is a mixture of diglycerides of stearic, palmitic and oleic acids linked to the choline ester of phosphoric acid. The efficacy of lecithin as a pore-forming agent in a sustained release formulation comprising deslorelin and stearin is described in International patent application No. PCT/AU96/00370 (WO 97/00693), the entire disclosure of which is incorporated herein by reference.
- As will be evident from the examples herein, variation of the identity and/or amount of the pore-forming agent(s) utilised allows for the manipulation of the release profile of the active agent(s) to suit particular therapeutic uses.
- The stearin excipient is preferably in a non-crystalline form. Stearin is partially hydrogenated palm oil having, as the principle fatty acids, C16:0(45%) and C18:0(53%). The melting point of stearin is about 60° C. It is believed that the use of stearin as the excipient contributes to the success of the formulations according to the invention, because it appears, surprisingly, to produce only a minimal to mild inflammatory response in a recipient resulting in the encapsulation of the formulation within a thin layer of fibroblasts. It will be appreciated by persons skilled in the art, that alternative formulations comprising excipient(s) with similar characteristics to those included in the formulation defined above in the first aspect may likewise provoke minimal to mild inflammatory responses and consequently be useful for the sustained-release of an active agent(s). Such alternative formulations are to be regarded as falling within the scope of the present invention.
- The formulations according to the invention may be for administration to humans and other animals selected from dogs, cats, other domestic animals, and captive wildlife.
- Typically, the formulations will release the active agent(s), in vitro, into phosphate buffered saline (PBS: pH 7.3, prepared by dissolving 8.00 g of sodium chloride, 1.00 g di-sodium hydrogen phosphate anhydrous, 0.40 g sodium dihydrogen phosphate dihydrate (0.31 g if anydrous), and 0.05 g sodium azide in 1 litre of deionised water), at 37° C. at a rate of about 2-350 μg/day for at least 7 days and up to about 2 years.
- Further, the formulations will typically exist as a depot formulation for example in the form of free flowing beads or rods which may have been extruded.
- Extruded rods may be cut into predetermined lengths for implantation by standard techniques, in a human or other animal. As will be readily appreciated, the length of the rod will determine the rate and dose of the active agent(s). As opposed to implanting longer rods more than one rod can be implanted in each human or other animal. Injection of a suspension of formulated particulate material such as free flowing beads may also deliver the active agent(s) at the desired rate and dose.
- Formulations for administration as free flowing beads and/or implants, particularly to dogs, may be produced as follows:
- Stearin (supplied as free flowing beads of 1 mm or less in diameter made by Vandenberg Foods) and pore-forming agent are mixed. The active agent may then be added and thoroughly mixed into the excipient and pore-forming agent mixture. This material may then be used for injection. Alternatively the mixture can be transferred to the barrel of a ram extruder that has a 1 mm nozzle attached and is equilibrated to 55° C. (or other temperature sufficient to soften the stearin). After attaching the ram, pressure (40 psi) is applied until the product begins to extrude. At this point the pressure can be backed off and the product allowed to reach 55° C. (or other temperature sufficient to soften the stearin). The product may then be extruded at, for example, a rate of 3 g over a 30 second period. The resulting extrudate is then allowed to cool and then broken up and re-extruded through a 1 mm nozzle to ensure uniformity of content throughout the mix. The 1 mm nozzle may then be replaced with a 2.3 mm diameter nozzle and the product extruded (using the same temperature equilibration procedure prior to extrusion). After cooling the long rods produced can be sectioned into lengths of the required weight and the sectioned lengths sterilised by gamma-irradiation.
- Alternatively, formulations for administration as bioimplants, particularly for dogs, may be produced by:
- Stearin and pore-forming agent are mixed. The active agent may then be added and thoroughly mixed into the excipient and pore-forming agent mixture. The mixture can then be transferred to the barrel of an extruder that has a 2.3 mm nozzle attached and which has been equilibrated to a temperature sufficient to soften the stearin. The extruder is started and the product begins to extrude and the extrudate is cut to length. The sectioned length can be terminally sterilised.
- Further, in preparing formulations according to the present invention, especially where the at least one active agent is a peptide(s), polypeptide(s) or protein(s), it is preferred that the at least one active agent is firstly pre-treated with a process comprising at least two freeze drying steps. Such freeze drying steps may be conducted in accordance with any of the commonly known methods for freeze drying of proteinaceous materials. It is, however, preferred that the active agent(s) be freeze dried from a 5-50% (more preferably, 5-15%) (w/w) solution of the active agent(s) in a suitable solvent (e.g. an alcohol solution such as 30% (w/w) ethanol in water). The freeze dried active agent(s) may then be redissolved or homogenised in a suitable solvent (e.g. 25-75% (w/w) in a diluted weak acid solution such as 1-5 % (w/w) acetic acid in water) and subsequently freeze dried again. Thus, the freeze drying of the active agent(s) may comprise the steps of;
- (i) forming a 5-50% (w/w) solution of the active agent(s),
- (ii) freeze drying said solution of step (i),
- (iii) forming a 25-75% (w/w) solution or homogenate from said freeze dried active agent(s), and
- (iv) freeze drying said solution or homogenate of step (iii).
- The term “on an active basis” is to be given its usual meaning in the art. That is, it is used to indicate that the % amount (w/w) of peptide agonist or analogue present in a formulation is based on the dry weight of the peptide agonist or analogue.
- The terms “comprise”, “comprises” and “comprising” as used throughout the specification are intended to refer to the inclusion of a stated step, component or feature or group of steps, components or features with or without the inclusion of a further step, component or feature or group of steps, components or features.
- The invention will hereinafter be further described by reference to the following, non-limiting examples and accompanying figures.
-
FIG. 1 provides a graph showing average daily in vitro release profiles from three 100 mg rods of each of formulations: (I) 6% deslorelin, 2% lysine and balance stearin; and (II) 6% deslorelin, 5% lysine and balance stearin. The graph demonstrates an initial rapid release of the active agent and then continued release extending over a prolonged period (110 days). -
FIG. 2 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (III) 6% deslorelin, 2% sodium sulphate and balance stearin; and (IV) 6% deslorelin, 5% sodium sulphate and balance stearin. The graph demonstrates that a greater initial rapid release of deslorelin (534 μg vs. 438 μg) was achieved using 5% sodium sulphate as the pore-forming agent. After the initial rapid release (finished at about day 10), the rate of release was about 10-2 μg/day for the next 95 days for both formulations. -
FIG. 3 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (V) 6% deslorelin, 2% hydroxy propyl methylcellulose (HPMC) and balance stearin; and (VI) 6% deslorelin, 5% hydroxy propyl methylcellulose (HPMC) and balance stearin. - The graph demonstrates that a much greater initial rapid release of deslorelin (685 μg vs. 403 μg) was achieved using 5% HPMC as the pore-forming agent. After the initial rapid release (finished at about day 10), the rate of release was about 10-2 μg/day for the next 95 days for both formulations.
-
FIG. 4 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (VII) 6% deslorelin, 2% glucose and balance stearin; and (VM) 6% deslorelin, 5% glucose and balance stearin. The graph demonstrates that a much greater initial rapid release of deslorelin (790 μg vs. 403 μg) was achieved using 5% glucose as the pore-forming agent. After the initial rapid release (finished at about day 10), the rate of release was about 50-2 μg/day for the next 95 days for both formulations. -
FIG. 5 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (IX) 6% soinatostatin, 0% acetate and balance stearin; (X) 6% somatostatin, 3% acetate and balance stearin; (XI 6% soniatostatin, 5% lysine and balance stearin; and (XII) 6% somatostatin, 10% lysine and balance stearin. The graph demonstrates that a greater initial rapid release of somatostatin was achieved using lysine than sodium acetate as the pore-forming agent After the initial rapid release (finished at about day 2), the rate of release in all cases slowed and plateaued by day 7. -
FIG. 6 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (XIII) 6% naltrexone (NX), 0% pore forming agent and balance stearin; (XIV) 6% iialtiexone (NX), 3%/o acetate and balance stealin; (XV) 6% naltrexone (NX), 5% lysine and balance stearin: and (XVI) 6% naltiexonie (NX), 10% lysine and balance stearin. The graph demonstrates that a sustained gradual release of iialtrexone was achieved by all formulations over 23 days of testing, although the average daily release was low when no pore-forming agent was included. -
FIG. 7 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (XVII) 6% lisinopril, 0% sodium acetate and balance stearin; (XVIII) 6% lisinopril, 3% sodium acetate and balance stearin; (XIX) 6% lisinopril, 5% lysine and balance stearin; and (XX) 6% lisinopril, 10% lysine and balance stearin. The graph demonstrates that following an initial rapid release (finished at about day 1) a sustained gradual release of lisinopril was achieved by all formulations over 25 days of testing, although the average daily release of this period of sustained release was low in the case of formulation XVII (i.e. 0% pore-forming agent). -
FIG. 8 provides a graph showing the average daily in vitro release profile from three 100 mg rods of each of formulations: (XXI) 6% thyrotropin releasing hormone (TRH), 0% acetate and balance stearin; (XXII) 6% thyrotropin releasing hormone (TRH), 3% acetate and balance stearin; (XXIII) 6% thyrotropiii releasing hormone (TRH), 5% lysine and balance stearin; and (XXIV) 6% thyrotropin releasing hormone (TrRH), 10% lysine and balance stearin. The graph demonstrates that following a very rapid initial release, a sustained gradual release of TRH was achieved with formulations XXII, XXII and XXIV over the 28 day period of of testing Where no pore-forming agent was included, no further TRH release was observed after day 1. -
FIG. 9 provides a graph showing the average daily in vitro release profile from three 100 mg rods of formulation: (XXV) 6% deslorelin, 3% sodium acetate and balance stearin. The graph demonstrates that sustained release of deslorelin over 110 days was achieved. - Formulations Comprising deslorelin and Lysine
- Formulations I and H (detailed above) were prepared as follows:
- Stearin (supplied as free flowing beads of 1 mm or less in diameter made by Quest International Pty Ltd (Netherlands) and lecithin (supplied as a deep brown viscous syrup from Lucas Myer (Germany) were hand mixed using a spatula in a small beaker. Deslorelin (Bacheni, Switzerland) pre-treated by the above described freeze drying process, was then added and thoroughly mixed into the excipients. The mixed material was transferred to the barrel of a ram extruder that has a 1 mm nozzle attached and is equilibrated to 55° C. The ram extrusion pressure was 40 psi. The ram was attached and pressure applied until the product began to extrude. At this point the pressure was backed off and the product allowed to reach 55° C. The product was then extruded at a rate of 3 g over a 30 second period. The resulting exudate was allowed to cool and then broken up and re-extruded through a 1 mm nozzle. This step was included to ensure uniformity of content throughout the matrix. The 1 mm nozzle was then replaced with a 2.3 mm diameter nozzle. The same product temperature equilibration procedure was conducted prior to extrusion. The product was then extruded and after cooling the long rods produced were sectioned into lengths of the required weight.
-
FIG. 1 provides results of in vitro deslorelin release with 100 mg rods containing 6 mg deslorelin. The assay involved immersing each rod into separate containers with 1 ml of phosphate buffered saline (PBS; as hereinbefore described) placed in a reciprocating water bath at 37° C. The PBS was replaced daily and the withdrawn PBS assayed for deslorelin with HPLC. The figure shows that after an initial rapid release of deslorelin, sustained release extending over a prolonged period (110 days) was achieved. The average daily rate of deslorelin release during the sustained release period was within the range 50-2 μg/day. - Formulations Comprising Deslorelin and Sodium Sulphate
- Formulations III and IV were prepared with sodium sulphate (Ajax Chemicals, USA) as the pore-forming agent in the same manner as described to above for deslorelin/lysine formulations.
-
FIG. 2 provides results of in vitro deslorelin release with 100 mg rods containing 6 mg deslorelin. The figure shows that a greater initial rapid release of deslorelin (534 μg vs. 438 μg) was achieved using a 5% concentration of sodium sulphate rather than a 2% concentration. After the initial rapid release (finished at about day 10), the rate of release was about 10-2 μg/day for the next 95 days for both formulations. - Formulations Comprising Deslorelin and HPMC
- Formulations V and VI were prepared with hydroxy propyl methylcellulose (HPMC) as the pore-forming agent in the same manner as described above for deslorelin/lysine formulations.
-
FIG. 3 provides results of in vitro deslorelin release with 100 mg rods containing 6 mg desloelin. The figure shows that a much greater initial rapid release of deslorelin (685 μg vs. 403 μg) was achieved using 5% PMC rather than 2% HPMC. After the initial rapid release (finished at about day 10), the rate of release was about 10-2 μg/day for the next 95 days for both formulations. - Formulations Comprising Deslorelin and Glucose
- Formulations VII and VIII were prepared with glucose (Ajax Chemicals, USA) as the pore-forming agent in the same manner as described above for deslorelin/lysine formulations.
-
FIG. 4 provides results of in vitro deslorelin release with 100 mg rods, containing 6 mg deslorelin. The figure shows that a much greater initial rapid release of deslorelin (790 μg vs. 403 μg) was achieved using 5% glucose rather than 2% glucose as the pore-forming agent. After the initial rapid release (finished at about day 10), the rate of release was about 50-2 μg/day for the next 95 days for both formulations. - Formulations Comprising Somatostatin and Sodium Acetate or Lysine
- Formulations IX to XII were prepared with sodium acetate or lysine as the pore-forming agent in a manner similar to that described above for deslorelin/lysine formulations. The somatostatin was obtained from Bachem (Switzerland).
-
FIG. 5 provides results of in vitro somatostatin release with 100 mg rods, containing 6 mg somatostatin. The figure shows that a greater initial rapid release of somatostatin was achieved using lysine than sodium acetate as the pore-forming agent. - Formulations Comprising Naltrexone and Sodium Acetate or Lysine
- Formulations XIII to XVI were prepared with sodium acetate or lysine as the pore-forming agent in a manner similar to that described above for deslorelin/lysine formulations.
-
FIG. 6 provides results of in vitro naltrexone release with 100 mg rods, containing 6 mg deslorelin. The figure shows that a sustained gradual release of naltrexone was achieved by all formulations over 23 days of testing, although the average daily release was low when no pore-forming agent was included. - Formulations Comprising Lisinopril and Sodium Acetate or Lysine
- Formulations XVII to XX were prepared with sodium acetate or lysine as the pore-forming agent in a manner similar to that described above for deslorelin/lysine formulations. The lisinopril was obtained from Sigma Chemical Co. (USA).
-
FIG. 7 provides results of in vitro lisinopril release from 100 mg rods, containing 6 mg lisinopril. The figure shows that following an initial rapid release (finished at about day 1) a sustained gradual release of lisinopril was achieved by all formulations over 25 days of testing, although the average daily release of this period of sustained release was low in the case of formulation XVII which contains no pore-forming agent. - Formulations Comprising TRH and Sodium Acetate or Lysine
- Formulations XX to XXIV were prepared with sodium acetate or lysine as the pore-forming agent in a manner similar to that described above for deslorelin/lysine formulations. The TRH was obtained from Sigma Chemical Co (USA).
-
FIG. 8 provides results of in vitro TRH release from 100 mg rods, containing 6 mg TRH. The figure shows that following a very rapid initial release, a sustained gradual release of TRH was achieved with formulations XXII, XXII and XXV over the 28 day period of of testing Where no pore-forming agent was included, no further TRH release was observed after day 1. - Formulations Comprising Deslorelin and Sodium Acetate
- Formulation XXV were prepared with sodium acetate as the pore-forming agent in the same manner as described above for deslorelin/lysine formulations.
-
FIG. 9 provides results of in vitro deslorelin release with 6 mg rods. The figure shows that sustained release of deslorelin over 110 days was achieved. - It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the invention as shown in the specific embodiments without departing from the spirit or scope of the invention as broadly described. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.
Claims (13)
1-40. (canceled)
41. A pharmaceutical and/or veterinary formulation comprising about 2-30% (w/w) (on an active basis) of at least one active agent, about 0.5-20.0% (w/w) of a pore-forming agent comprising lecithin and an organic salt, and the balance stearin.
42. A formulation according to claim 41 , wherein the formulation comprises about 5-10% (w/w) (on an active basis) of the at least one active agent, about 1.0-10.0% (w/w) of the pore-forming agent and the balance stearin.
43. A formulation according to claim 41 , wherein the formulation comprises about 5-10% (w/w) (on an active basis) of the at least one active agent. about 2.0-5.0% (w/w) of the pore-forming agent and the balance stearin.
44. A formulation according to claim 41 , wherein the pore-forming agent comprises lecithin and sodium acetate.
45. A formulation according to claim 41 , wherein the at least one active agent is selected from peptides, polypeptides, proteins and nucleic acid compounds and derivatives.
46. A formulation according to claim 41 , wherein the at least one active agent is selected from GnRII agonists.
47. A formulation according to claim 46 , wherein the GnRH agonist(s) is selected from deslorelin, eulexin, goserelin, leuprolide. dioxalan derivatives, triptorelin, mieterelin, buserelin, histerlin, nafarelin, lutrelm, leuprorelin and LIIRII analogues.
48. A formulation according to claim 46 , wherein the GnRII agonist(s) is deslorelin and the pore-forming agent comprises lecithin and sodium acetate.
49. A formulation according to claim 41 , wherein the at least one active agent has a log octanol/water partition coefficient (log P) in the range of 5.0 to −3.0.
50. A formulation according to claim 49 , wherein the at least one active agent has a log octanol/water partition coefficient (log P) in the range 1.0 to −3.0.
51. A formulation according to claim 41 , wherein the formulation is in the form of free flowing beads or rods.
52. A method of treating a disease or condition in a human or other animal, the method comprising administering to the human or other animal a formulation according to claim 41.
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US8052982B2 (en) * | 1998-07-20 | 2011-11-08 | Peptech Animal Health Pty Limited | Bioimplant formulation comprising lecithin and stearin |
BR9912275A (en) * | 1998-07-20 | 2001-04-17 | Peptech Ltd | Bioimplant formulation |
CA2398995C (en) | 2000-02-04 | 2014-09-23 | Children's Hospital Research Foundation | Lipid hydrolysis therapy for atherosclerosis and related diseases |
US7109171B2 (en) * | 2000-02-28 | 2006-09-19 | Praecis Pharmaceuticals Inc. | Methods for treating FSH related conditions with GnRH antagonists |
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- 1999-07-20 JP JP2000560890A patent/JP2002521331A/en active Pending
- 1999-07-20 EP EP99932545A patent/EP1104296B1/en not_active Expired - Lifetime
- 1999-07-20 CA CA2336879A patent/CA2336879C/en not_active Expired - Lifetime
- 1999-07-20 MX MXPA01000674A patent/MXPA01000674A/en active IP Right Grant
- 1999-07-20 ES ES99932545T patent/ES2389627T3/en not_active Expired - Lifetime
- 1999-07-20 CN CNB998089613A patent/CN1243543C/en not_active Expired - Lifetime
- 1999-07-20 WO PCT/AU1999/000585 patent/WO2000004897A1/en active IP Right Grant
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US10729739B2 (en) | 2008-02-11 | 2020-08-04 | Ferring B.V. | Methods of treating prostate cancer with GnRH antagonist |
US10973870B2 (en) | 2008-02-11 | 2021-04-13 | Ferring B.V. | Methods of treating prostate cancer with GnRH antagonist |
US20190224271A1 (en) * | 2012-06-01 | 2019-07-25 | Ferring B.V. | Manufacture of degarelix |
US10765721B2 (en) * | 2012-06-01 | 2020-09-08 | Ferring B.V | Manufacture of Degarelix |
US11260102B2 (en) | 2012-06-01 | 2022-03-01 | Ferring B.V. | Manufacture of Degarelix |
US11510962B2 (en) | 2012-06-01 | 2022-11-29 | Ferring B.V. | Manufacture of degarelix |
Also Published As
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ES2389627T3 (en) | 2012-10-29 |
CA2336879A1 (en) | 2000-02-03 |
EP1104296B1 (en) | 2012-06-13 |
CN1243543C (en) | 2006-03-01 |
JP2002521331A (en) | 2002-07-16 |
EP1104296A4 (en) | 2004-11-10 |
CA2336879C (en) | 2010-06-01 |
EP1104296A1 (en) | 2001-06-06 |
WO2000004897A1 (en) | 2000-02-03 |
MXPA01000674A (en) | 2002-04-08 |
BR9912275A (en) | 2001-04-17 |
CN1310623A (en) | 2001-08-29 |
US6913761B1 (en) | 2005-07-05 |
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