Classifications

• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
  • A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
  • A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
  • A23L33/14—Yeasts or derivatives thereof
• • 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
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
  • A61K31/4164—1,3-Diazoles
  • A61K31/4172—Imidazole-alkanecarboxylic acids, e.g. histidine
• • A—HUMAN NECESSITIES
  • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
  • A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
  • A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
  • A23L33/10—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K36/00—Medicinal preparations of undetermined constitution containing material from algae, lichens, fungi or plants, or derivatives thereof, e.g. traditional herbal medicines
  • A61K36/06—Fungi, e.g. yeasts
• • 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
  • A61K9/0053—Mouth and digestive tract, i.e. intraoral and peroral administration
• • 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
  • A61K9/141—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers
  • A61K9/148—Intimate drug-carrier mixtures characterised by the carrier, e.g. ordered mixtures, adsorbates, solid solutions, eutectica, co-dried, co-solubilised, co-kneaded, co-milled, co-ground products, co-precipitates, co-evaporates, co-extrudates, co-melts; Drug nanoparticles with adsorbed surface modifiers with compounds of unknown constitution, e.g. material from plants or animals
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P27/00—Drugs for disorders of the senses
  • A61P27/16—Otologicals

Definitions

• the present invention relates to novel uses of ergothioneine, particularly use for suppressing or preventing inner ear hearing loss.
• Ergothioneine a type of amino acid, is known to have a high antioxidant effect, but since it is a substance that cannot be synthesized in the human body, it is expected to be developed into cosmetics, foods, medicines, feeds, etc. containing ergothioneine. ing. However, the functions of ergothioneine in the human body have not been elucidated.
• Most hearing loss is caused by damage to one of the outer, middle, or inner ear that make up the ear. broadly classified. These hearing impairments are further subdivided according to the cause, and age-related hearing impairment is known as one of the sensorineural hearing impairments.
• Age-related hearing loss is literally hearing loss that progresses with age, and there is no fundamental treatment for it.
• No. 5,421,366 discloses a sterile pharmaceutical composition for use in the treatment of otic disorders by intratympanic administration to the ear, said pharmaceutical composition comprising a copolymer of polyoxypropylene and polyoxyethylene and an otic structure modifying agent such that sustained release into the ear occurs for at least 3 days, wherein said otic structure modifying agent is a modulator of bone remodeling
• a pharmaceutical composition characterized by is disclosed (Claim 1, etc.).
• the publication mentions various diseases as target diseases of the above composition, including age-related hearing loss. No studies have been conducted to confirm that it is effective for prevention, etc.
• ergothioneine is effective in preventing inner ear hearing loss such as age-related hearing loss, and completed the present invention.
• a composition for the suppression or prevention of inner ear hearing loss the composition comprising ergothioneine.
• administration includes oral administration.
• [7] The composition according to any one of [1] to [6], wherein the inner ear hearing loss is not drug-induced hearing loss.
• [8] The composition of any one of [1] to [7], wherein the subject to whom ergothioneine is administered has been diagnosed with age-related hearing loss by auditory brainstem response (ABR).
• ABR auditory brainstem response
• the composition of [9], wherein the yeast is an imperfect yeast belonging to the genus Rhodotorula.
• the composition of [8] or [9] further comprising yeast extract.
• [12] The composition of [11], wherein ergothioneine is contained in a yeast extract.
• composition in a first aspect, there is provided a composition for suppressing or preventing inner ear hearing loss, the composition comprising ergothioneine or a salt thereof.
• Age-related hearing loss also known as presbycusis, is acquired inner ear hearing loss and is classified as sensorineural hearing loss. Age-related hearing loss is preferred for inner ear hearing loss.
• Ergothioneine is in the low frequency range of the audible range (eg, 1 to 40 kHz for mice, 2 to 20 kHz for humans), preferably 0% to 90% of the frequency range from the low frequency side of the audible range (eg, 1 for mice ⁇ 36.1 kHz, 2-18.2 kHz for humans), more preferably 0%-70% frequency band (for example, 1-28.3 kHz for mice, 2-14.6 kHz for humans) hearing loss suppression have an effect.
• 0% to 90% frequency band from the low frequency side of the audible range is the percentage corresponding to [lower limit frequency] + ([upper limit frequency] - [lower limit frequency]) For example, if the lower limit frequency is 1 kHz and the upper limit frequency is 40 kHz, the 50% frequency is 20.5 (1+(40 ⁇ 1) ⁇ 0.5).
• Other causes of acquired inner ear hearing loss include genetic disorders (eg, connexin 26 gene mutations, Waardenburg syndrome, Usher syndrome, Pendred syndrome), noise exposure, and ototoxic drugs (eg, aspirin, aminoglycosides) drug, vancomycin, cisplatin, furosemide, ethacrynic acid, quinine), infections (e.g., meningitis, labyrinthitis suppurativa), autoimmune diseases (e.g., rheumatoid arthritis, systemic lupus erythematosus), Meniere's syndrome, barotrauma ( perilymphatic fistula), head trauma (with skull base fracture or cochlear concussion), and auditory neuropathy.
• genetic disorders eg, connexin 26 gene mutations, Waardenburg syndrome, Usher syndrome, Pendred syndrome
• noise exposure e.g., aspirin, aminoglycosides
• ototoxic drugs
• Congenital inner ear hearing loss Hereditary, idiopathic (unknown cause) malformations
• congenital infections e.g. rubella, cytomegalovirus infection, toxoplasmosis, syphilis
• Rh blood group incompatibility e.g. anoxia
• maternal ingestion of ototoxic drugs e.g, for tuberculosis and severe infections
• drug-induced malformations eg, with thalidomide
• the active ingredient, ergothioneine is a type of sulfur-containing amino acid. Intake of a composition containing an effective amount of ergothioneine achieves inhibition, prevention or treatment of inner ear hearing loss. Ergothioneine is preferably in the L form.
• Ergothioneine may be in the form of a salt.
• the type of salt is not particularly limited as long as it is pharmaceutically acceptable. Salts with hydrochloric acid, phosphoric acid, sulfuric acid, nitric acid, boric acid (inorganic acid salts), formic acid, acetic acid, lactic acid, fumaric acid, etc. , maleic acid, tartaric acid, and citric acid (organic acid salts).
• “ergothioneine” may also include pharmaceutically acceptable salts thereof, unless otherwise specified.
• Ergothioneine may be commercially available or synthesized.
• Methods for producing ergothioneine include, for example, a chemical synthesis method, a method of extracting and purifying ergothioneine after culturing ergothioneine-producing fungi (including mushrooms such as coprinus comatus, oyster mushroom, oyster mushroom, enoki mushroom, king oyster mushroom, and shiitake mushroom), a fermentation method, Examples thereof include a method of extracting from animal blood containing ergothioneine.
• Yeast is an example of a fungus that produces ergothioneine.
• "yeast” is not particularly limited as long as it can produce ergothioneine under culture conditions.
• the yeast used herein is preferably budding yeast, more preferably imperfect yeast.
• imperfect yeast examples include yeasts of the genus Rhodotorula and Cryptococcus, among which the genus Rhodotorula is preferred.
• Yeast belonging to the genus Rhodotorula includes Rhodotorula mucilaginosa, Rhodotorula glutinis, and the like.
• ergothioneine When ergothioneine is derived from fungi such as yeast, it may be incorporated into the composition in a state of being contained in the cells of the fungus, or may be incorporated into the composition as an extract after being extracted from the fungus. Ergothioneine is contained in the cells or extract at any concentration. For example, the extract may contain ergothioneine at a solids concentration of 0.1-20%. Ergothioneine can be appropriately purified according to the desired purity. A known method can be used for the purification method, and for example, column chromatography using a normal phase column, a reversed phase column, an ion exchange column or the like, crystallization, membrane treatment, activated carbon treatment or the like can be appropriately combined.
• the composition may be in the form of bacterial cells, or in combination with other ingredients, in the form of medicine, food or supplement.
• foods include foods for specified health uses, foods with function claims, and foods with nutrient function claims.
• the composition may contain additional components for suppressing or preventing inner ear hearing loss and commonly used carriers such as excipients, disintegrants, lubricants, buffers, etc., within the range that does not impair the effect of ergothioneine as an active ingredient.
• Agents, binders, emulsifiers, suspending agents, stabilizers, preservatives, preservatives, saline and the like may also be included.
• stabilizers include cyclodextrins.
• the composition may contain fungal cells or an extract thereof, or may contain purified ergothioneine.
• the fungal extract may be powdered.
• the subject to which the composition is administered is not limited to humans, and may be non-human animals such as mice.
• the composition is administered to a subject expected to develop inner ear hearing loss in the future, a subject who has already developed inner ear hearing loss, eg, a subject diagnosed with inner ear hearing loss.
• a subject who has already developed inner ear hearing loss eg, a subject diagnosed with inner ear hearing loss.
• auditory brainstem response can be used as a method for diagnosing age-related hearing loss.
• the amount of ergothioneine in the composition is appropriately changed depending on the symptoms, age, sex, administration frequency, etc. of the human to whom the composition is administered, and is appropriately within the range of 0.01 mg/kg body weight or more and less than 100 mg/kg body weight per day. can be adjusted.
• ergothioneine is preferably administered at a dose of about 0.1 mg to 1000 mg per day, more preferably 0.2 to 800 mg, more preferably 0.5 to 500 mg. It is particularly preferred to administer ergothioneine so that
• the administration period and administration frequency vary depending on the subject's symptoms and dosage, it is preferable to administer once a day for at least 1 week or longer, preferably 10 weeks or longer, for example 13 weeks or longer.
• long-term treatment for example, treatment for 13 weeks or more can increase the effect of suppressing hearing loss.
• the dosage forms of the composition include tablets, powders, fine granules, granules, capsules, syrups, injections, external preparations, suppositories, and the like.
• lactose, starch, sorbitol, D-mannitol, etc. can be used as excipients.
• Starch, carboxymethyl cellulose, calcium carbonate and the like can be used as the disintegrant.
• Phosphate, citrate, acetate and the like can be used as buffers.
• Gum arabic, sodium alginate, tragacanth and the like can be used as emulsifiers.
• pullulan, gum arabic, gelatin, starch and the like can be used as a binding agent.
• Lubricants that can be used include magnesium stearate, methylcellulose, and magnesium silicate.
• suspending agents glyceryl monostearate, aluminum monostearate, methylcellulose, carboxymethylcellulose, hydroxymethylcellulose, sodium lauryl sulfate and the like can be used.
• Propylene glycol, dietyrin sulfite, ascorbic acid and the like can be used as stabilizers.
• Preservatives that can be used include phenol, benzalkonium chloride, benzyl alcohol, chlorobutanol, methylparaben, and the like.
• antiseptics benzalkonium chloride, paraoxybenzoic acid, chlorobutanol, and the like can be used.
• the dosage form of the composition is not particularly limited as long as the inner ear hearing loss can be suppressed or prevented, and examples include oral administration and parenteral administration such as intravenous, intraperitoneal, subcutaneous or transdermal administration.
• a method for the inhibition or prevention of inner ear hearing loss in a subject comprising administering ergothioneine or a salt thereof to the subject.
• subjects to whom ergothioneine is administered are those who need to suppress or prevent inner ear hearing loss.
• Subjects are not limited to humans and may be non-human animals such as mice.
• Ergothioneine can be administered in combination with other ingredients known to be effective in suppressing or preventing inner ear hearing loss, and each administration may be administered at the same time or at different times.
• the dosage form, dosage, route of administration, etc. of ergothioneine are as described above.
• Example 1 1. Materials and Methods 1.1. Ergothioneine and vehicle 1.1.1. Production of Yeast Extract Powder Containing Ergothioneine From a culture medium in which Rhodotorula mucilaginosa yeast was cultured in a liquid medium, cells were collected by centrifugation (12,000 ⁇ g, 90 minutes). After washing the obtained cells with water, centrifugation (12,000 ⁇ g, 90 minutes) was repeated twice. Water was added to the cells, and the cells were treated at 95° C. for 10 minutes to extract ergothioneine in the cells.
• an extract was obtained by centrifugation (12,000 ⁇ g, 90 minutes), and a crude purified liquid was obtained by treatment with a UF membrane (molecular weight cutoff: 6 kDa, 25° C.). After concentrating the crude purified liquid with an evaporator, heat sterilization treatment was performed at 80° C. for 30 minutes.
• the yeast extract powder was obtained by spray-drying the crude purified liquid after sterilization.
• the ergothioneine content was measured by HPLC using an Asahipak NH2P-50 column. Ergothioneine was eluted using a concentration gradient of eluate A (0.1% by volume triethylamine, 50 mM sodium phosphate buffer: pH 7.3) and eluate B (100 mM NaCl). Absorbance at a wavelength of 254 nm was measured, and elution of ergothioneine was observed at about 5.7 minutes. A 10 ⁇ g/ml concentration aqueous solution of the yeast extract was subjected to membrane filtration with a 0.2 ⁇ m filter, and the filtrate was subjected to HPLC measurement to confirm that it contained 75 mg/g of ergothioneine.
• Test system 2.1 Animal Species and Strains The following mouse (SPF) strains, which are animal species commonly used in age-related deafness models and whose strain maintenance has been established, were used. C57BL/6J (Charles River Japan Co., Ltd.)
• Route of administration Oral Method of administration: Oral disposable mouse probe (Fuchigami Kikai Co., Ltd.) attached polypropylene disposable syringe (Terumo Corporation) It was orally administered using At the time of administration, the sample was agitated using a magnetic stirrer, and after aspiration into the syringe, the administration sample adhering to the oral sonde was wiped off.
• Dosing time Administered from 8:30 to 11:00.
• Administered liquid volume Calculated at 10 mL/kg based on the body weight closest to the date of administration.
• Administration period 13 weeks (91 days). Dosing frequency: once a day.
• Test groups were the following two groups. The number of animals in each group was eight. a) Vehicle was administered at 10 mL/kg.
• Body weight measurement Body weight was measured on day 1 of administration (the first day of administration is counted as day 1), once every two weeks thereafter, and when general conditions were observed on the day of ABR examination.
• ABR test was performed before administration (11 weeks old) and the day after the last administration day (25 weeks old). Animals were treated with a mixed anesthetic [ketamine hydrochloride (75 mg/kg) and xylazine hydrochloride (10 mg/kg)] using a polypropylene disposable syringe (Terumo Corp.) fitted with a 27G needle (Terumo Corp.). was administered subcutaneously (dosage volume: 2 mL/kg).
• a seki electrode was placed subcutaneously near the outer ear of ear test (right ear), an indifferent electrode was placed subcutaneously on the top of the head, and a ground electrode was placed subcutaneously on the back of the neck.
• the potential of the ABR was induced from the electrode to a biopotential amplifier (Model: ER-1, Cygnus Technology Inc.) and recorded in a data recording/analysis system (PowerLab, Sampling software: LabChart ver.8, ADInstruments) (recording conditions: Sampling time: 10 ms, Sampling rate: 40 kHz, Bandpass filter: 1-3000 Hz, Addition times: 500 times).
• Sound stimulation was provided by inserting a coupler type speaker (Model: ES1spc, Bio Research Center Co., Ltd.) into the right ear canal and applying it from a TDT sound system (ZBus for system 3, Tucker-Davis Technologies Inc.) (sound pressure range: 10- 90 dB, Tone types: 24 and 32 kHz Tone burst).
• ABR was recorded by first applying a 90 dB sound stimulus. After that, the sound pressure was appropriately changed, and the maximum sound pressure at which the ABR waveform disappeared and the minimum sound pressure at which the ABR waveform was detected were confirmed in 5 dB steps. The minimum sound pressure at which the ABR waveform was detected was taken as the sound pressure threshold (ABR thresholds; dB SPL). When no ABR waveform was detected with a 90 dB sound stimulus, the sound pressure threshold was regarded as 95 dB SPL. After the measurement, the ABR waveform data was stored in an electronic medium (CD-R).
• CD-R electronic medium
• Example 2 A yeast extract powder was prepared in the same manner as in Example 1, except that ⁇ -cyclodextrin was added so that the solid content during spray drying was 20 parts by weight.
• the yeast extract powder obtained was subjected to HPLC measurement in the same manner as in Example 1, and it was confirmed that the powder contained 58 mg/g of ergothioneine.
• the subsequent procedures are the same as in Example 1, and the yeast extract powder containing ergothioneine was prepared to have a concentration of 38.8 mg/mL, unlike the 30 mg/mL in Example 1.
• the amount of ergothioneine used is the same as in Example 1.
• Example 2 In the test system using an animal model, 10-week-old males were used as in Example 1, but the number was increased to 28 animals. The preliminary breeding period was 15 days. The test groups were the following two groups. There were 12 animals in each group. a) Vehicle was administered at 10 mL/kg.
• Example 2 The post-administration animals were observed and tested for ABR (auditory brainstem response) in the same manner as in Example 1.
• the only difference from Example 1 was that it was performed before administration (11 weeks old), 8 weeks after administration (20 weeks old), and the day after the last administration day (25 weeks old).
• the average value and standard error were calculated for the sound pressure threshold and body weight at each time point for each group, and the obtained results were statistically analyzed.
• Significant difference test was first performed Wilcoxon's signed rank sum test on sound pressure thresholds at 24 and 32 kHz between 11 weeks old (Pre) and 25 weeks old (post) of the control group. was confirmed to occur. Wilcoxon's rank sum test was then performed at each time point between the control group and the test substance group.
• the significance level was set to 5%, and was divided into less than 5% (p ⁇ 0.05) and less than 1% (p ⁇ 0.01).
• the significance test was performed using a commercially available statistical program (SAS system, SAS Institute Japan Co., Ltd.).
• Each value is the average ABR threshold (dB SPL) ⁇ S.E. E. ). Same below. **: p ⁇ 0.01, significant difference compared to before administration. #: p ⁇ 0.05, ##: p ⁇ 0.01, significant difference compared to control. **: p ⁇ 0.01, significant difference compared to before administration. #: p ⁇ 0.05, significant difference compared to control.
• the hearing loss suppressing effect of ergothioneine was confirmed at any frequency, but it was particularly remarkable at 24 kHz. Since the symptoms of hearing loss usually develop in the high frequency range (Exp Anim. 2015;64(3):241-251), it is difficult to recognize the suppression effect at high frequencies (32 kHz), including variations, but in the case of high frequencies, administration Extending the duration increases the hearing loss suppression effect.

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• 2022
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