NO347612B1 - Method for removing crustacean ectoparasites from farmed salmonid fish using water-soluble tetrapyrrole compounds and light - Google Patents
Method for removing crustacean ectoparasites from farmed salmonid fish using water-soluble tetrapyrrole compounds and light Download PDFInfo
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- NO347612B1 NO347612B1 NO20210775A NO20210775A NO347612B1 NO 347612 B1 NO347612 B1 NO 347612B1 NO 20210775 A NO20210775 A NO 20210775A NO 20210775 A NO20210775 A NO 20210775A NO 347612 B1 NO347612 B1 NO 347612B1
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- Norway
- Prior art keywords
- water
- soluble
- tetrapyrrole
- light
- present
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/10—Culture of aquatic animals of fish
- A01K61/13—Prevention or treatment of fish diseases
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K41/00—Medicinal preparations obtained by treating materials with wave energy or particle radiation ; Therapies using these preparations
- A61K41/0057—Photodynamic therapy with a photosensitizer, i.e. agent able to produce reactive oxygen species upon exposure to light or radiation, e.g. UV or visible light; photocleavage of nucleic acids with an agent
- A61K41/0071—PDT with porphyrins having exactly 20 ring atoms, i.e. based on the non-expanded tetrapyrrolic ring system, e.g. bacteriochlorin, chlorin-e6, or phthalocyanines
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
- A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
- A01N43/90—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having two or more relevant hetero rings, condensed among themselves or with a common carbocyclic ring system
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/16—Heavy metals; Compounds thereof
- A01N59/20—Copper
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
- A01P7/00—Arthropodicides
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/69—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit
- A61K47/6949—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit inclusion complexes, e.g. clathrates, cavitates or fullerenes
- A61K47/6951—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit inclusion complexes, e.g. clathrates, cavitates or fullerenes using cyclodextrin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
Landscapes
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- Health & Medical Sciences (AREA)
- Environmental Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Zoology (AREA)
- Wood Science & Technology (AREA)
- Pest Control & Pesticides (AREA)
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- Animal Behavior & Ethology (AREA)
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- Public Health (AREA)
- Agronomy & Crop Science (AREA)
- Epidemiology (AREA)
- Pharmacology & Pharmacy (AREA)
- Medicinal Chemistry (AREA)
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- Biodiversity & Conservation Biology (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Insects & Arthropods (AREA)
- Inorganic Chemistry (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Meat, Egg Or Seafood Products (AREA)
Description
METHOD FOR REMOVING CRUSTACEAN ECTOPARASITES FROM FARMED SALMONID FISH USING WATER-SOLUBLE TETRAPYRROLE COMPOUNDS AND LIGHT
Field of the invention
The invention relates to a new method for removing or killing of ectoparasites from farmed fish. More particularly, the invention relates to removing or killing crustacean ectoparasites from farmed fish. The fish may be a salmonid fish, such as Atlantic salmon (Salmo salar L.) or rainbow trout (Oncorhynchus mykiss). The crustacean ectoparasite may be salmon lice (Lepeophtheirus salmonis, Caligus rogercresseyi, Caligus spp.). Even more particularly the invention relates to a method comprising treatment means where light from an artificial light source is used in combination with at least one chemical compound at toxicologically acceptable concentrations for fish, in particular salmonid fish. The method relates to the use of a combination of certain water-soluble cyclic tetrapyrrole compounds and light. In particular the invention relates to a composition in the form of an aqueous solution comprising the water-soluble cyclic tetrapyrrole compound, the cyclic tetrapyrrole compound is a member of a group consisting of porphin, porphyrins, chlorins, bacteriochlorins, phthalocyanines and pharmaceutical acceptable derivatives of porphyrins, chlorins, bacteriochlorins, and phthalocyanines, with the proviso that the water-soluble cyclic tetrapyrrole compound is not chlorophyllin.
Background
Aquaculture, also referred to as aquafarming, is the farming of aqueous organism. Aquaculture involves cultivating fresh water and saltwater populations under controlled conditions and is in contrast to commercial harvesting or fishing where the organisms are naturally present. The farmed organisms can typically be fish, crustaceans, mollusks, aquatic plants, and algae. The aquaculture farms can be in the form of tanks (closed or semi closed), fishponds, ocean cages or nets.
Diseases, especially infectious diseases, are a problem in aquaculture. Within fish aquaculture, especially salmon farming, there has been a development of prophylactic therapy in the form of vaccines and development of treatment of disease in the form of various drugs. However, salmon lice infection remains a main problem regarding salmon farming.
Relevant prior art publications and their relevant content
Currently several non-medicinal approaches are used to reduce the number of infected fish in the fish farm or to remove lice from infected fish. Several drugs are also currently used to combat salmon lice infections in fish farming. The regulatory approved drug substances include organophosphates, pyrethroids and hydrogen peroxide.
Azamethiphos is an organophosphatase inhibitor of acetylcholinesterase. Azamethiphos is the active substance in the commercial product Azasure. Deltamethrin is a pyrethrin that interferes with the nerve membrane function in salmon lice resulting in paralysis and death. Deltamethrin is the active drug substance in the commercial product ALPHA MAX. Hydrogen peroxide has for many years been used to combat salmon lice infections in fish including salmon. The mechanism of action is probably related to an oxidative effect on lice components and the formation of oxygen emboli within the salmon lice.
Development of drug resistance is a general problem with farming of fish including salmon, and currently the development of resistance is known for all drug substances used in fish farming.
Although vaccines against salmon lice have been described in the patent literature, see for example WO2018035199 and others, no commercial vaccine are currently in use for treatment of fish, including salmon, infected by salmon lice.
There is a need for improved methods for treatment and prophylaxis of salmon lice infections in fish farming, and during the last 10 years there have been published several new patent families within the field. See for example WO2020048945, WO2019168406, WO2019146827, WO2019146826, WO2019146825, WO2019245891, WO2019245722, WO2019234396, WO2019045573, WO2019145730, WO2019121900, WO2019121887, WO2019034694 and WO2019031970.
The combination of light and drugs related to fish has been a topic in a few published scientific documents. Photodynamic therapy is generally a term for a therapy that involves a so-called photosensitizer and light, and oxygen, where the light activates the photosensitizer to generate singlet oxygen and other reactive and toxic species. Photodynamic therapy is well described in human medicine, see for example: Kwiatkowski S et al., 2018, Photodynamic therapy - mechanisms, photosensitizers and combinations. Biomed Pharmacother. 106:1098-1107. The clinical use of photodynamic therapy is, however, limited to some specific indications; especially some skin diseases with products comprising 5-aminolevulinic acid methyl ester as photosensitizer, and agerelated macular degeneration with products comprising verteporfin as photosensitizer. Many of the publications on photodynamic therapy relates to cancer and some publications relate to infections, however, these diseases are not commonly treated by photodynamic therapy.
D-P Häder et al., 2016, Fighting fish parasites with photodynamically active chlorophyllin. Parasitol. Res. 115: 2277-2283, describe a study where water-soluble chlorophyllin was used. The result was “In Ichthyobodo, 2 μg/mL proved sufficient with subsequent simulated solar radiation to almost quantitatively kill the parasites, while in Dactylogyrus, a concentration of about 6 μg/mL was necessary. The LD50 value for this parasite was 1.02 μg/mL. Trichodina could be almost completely eliminated at 2 μg/mL. Only in the parasitic crustacean Argulus, no killing could be achieved by a photodynamic reaction using chlorophyllin.” The chlorophyllin was prepared from spinach and does not comprise copper.
Eliana Alves et al., 2015, Potential applications of porphyrins in photodynamic inactivation beyond the medical scope. J. Photochem. and Photobiol. C: Photochemistry Reviews, 22:34-57 is a general review publication within the field on photodynamic therapy. Figure 4 on page 43 in this publication illustrates generally a treatment protocol for photodynamic treatment of infected fish. The text in page 43 refers to Elina Alves et al., 2011, Photodynamic antimicrobial chemotherapy in aquaculture; photoinactivation studies if Vibrio fischeri in PLOS One 6, 6, e20970. The light is “solar irradiation from 380 to 700 nm consisting in 13 OSRAM lamps.” The photosensitizer used in these studies is a porphyrin derivative.
Peter KJ Robertson et al., 2009, A new generation of biocides for control of crustacea in fish farms. J. Photochem and Photobiol. B, 95: 58-63. This publication relates to the field of photodynamic therapy where light and a photosensitizer are used to generate toxic species. The photosensitizer was methylene blue or nuclear fast red, the marine species as a model organism in place of salmon lice was the marine copepod Acartia clause, the lamp was a 500W tungsten halogen lamp. The result showed that the marine copepod mortality with methylene blue was high when the methylene blue concentration was 1 micromolar or above at 1 hour light activation. With nuclear fast red as photosensitizer, there was not observed any mortality during 1 hour light activation. All light sources used in the above discussed prior art relate to white light.
The invention has for its object to remedy or to reduce at least one of the drawbacks of the prior art, or at least provide a useful alternative to prior art. The object is achieved through features, which are specified in the description below and in the claims that follow.
Summary of the present invention
The invention relates to a new method for treatment of salmon lice (L. salmonis, C. rogercresseyi, Caligus spp.) in farmed fish such as Atlantic salmon (S. salar L.) using an artificial light source and at least one chemical substance at toxicologically acceptable concentrations for Atlantic salmon. More specifically, the present inventors have identified a novel therapy for the treatment of salmon louse in farmed Atlantic salmon populations that comprises a combination of artificial light together with watersoluble tetrapyrrole compounds with the proviso that the water-soluble tetrapyrrole compound is not chlorophyllin. Chlorophyll is not a water-soluble tetrapyrrole compound.
The fish may be a salmonid fish, such as Atlantic salmon (Salmo salar L.) or rainbow trout (Oncorhynchus mykiss). For convenience fish is referred to as Atlantic salmon or salmon in the preceding text and in the text to follow, however, without excluding rainbow trout, other salmonid species or other relevant fish species. The invention is defined by the independent patent claims. The dependent claims define advantageous embodiments of the invention.
The most preferred artificial light sources, according to the present invention, generate blue light. In the present description blue light comprises violet light (380nm to 450 nm, blue light (450nm to 485nm) and cyan light (485nm to 500nm). Blue light as used herein covers the wavelength from 380nm to 500nm.
The additional most preferred artificial light sources, according to the present invention, generate red light. Red light as used herein covers the wavelength from 625nm to 740nm.
More specifically, the invention relates to a composition in the form of an aqueous solution comprising a chemical compound for use in a method of therapy using artificial light for an external crustacean parasite infection in salmonid fish, said external crustacean parasite infection comprises an infection of salmon lice, Lepeophtheirus salmonis, Caligus rogercresseyi and Caligus spp. Said chemical compound is a watersoluble cyclic tetrapyrrole compound. The cyclic tetrapyrrole compound is a member of a group consisting of porphin, porphyrins, chlorins, bacteriochlorins, phthalocyanines and pharmaceutical acceptable derivatives of porphyrins, chlorins, bacteriochlorins, and phthalocyanines, with the proviso that the water-soluble cyclic tetrapyrrole compound is not chlorophyllin or a derivative of chlorophyllin.
Said composition is administered in a bath treatment of the salmonid fish in need of such treatment, and the salmon lice is illuminated by artificial light.
In one embodiment said water-soluble cyclic tetrapyrrole compound may be a watersoluble cyclic tetrapyrrole derivative such as a toxicologically acceptable salt. In one embodiment said water-soluble cyclic tetrapyrrole compound may comprise sulphonic acid. In one embodiment said water-soluble cyclic tetrapyrrole compound may comprise one to four sulfonic acid groups. In one embodiment said water-soluble cyclic tetrapyrrole compound may be a water-soluble cyclic tetrapyrrole compound in the form of a toxicologically acceptable cyclodextrin complex.
In one embodiment said artificial light may be blue light. In an alternative embodiment said artificial light may be red light. The most preferred light is blue light. In an alternative embodiment said artificial light is a combination of blue light and red light.
In one embodiment source of artificial light may comprise of LED lamps. In one embodiment said artificial light source may comprise of a laser light system. The laser light system may be a laser light system targeting the salmon lice present on the fish, or the laser light system may be a laser light system that do not target salmon lice present on the fish.
The salmonid fish may be located in a receptacle. The receptacle may be one of a closed tank, a semi-closed tank, a chamber, a container, and a fishpond. The salmonid fish may be located in one of an ocean cage and a net pen.
The blue light source may comprise of LED lamps. The LED lamps may emit light of a wavelength of 380nm to 500nm, for example around 450 to 460 nm. Said watersoluble tetrapyrrole compound may be added in the water surrounding the salmonid fish. The water surrounding the salmonid fish may form the bath treatment.
In a second aspect the invention relates to a method for use of a composition as described above, wherein the method of therapy comprises use of artificial light. Said method may be a photodynamic method. The method may comprise using a watersoluble tetrapyrrole compound or a pharmaceutical acceptable derivative thereof as a photosensitizer.
The artificial light may be blue light. The source of artificial light comprises of LED lamps. The artificial light may be red light. The method of therapy comprises salmonid fish located in a receptacle. The method of therapy comprises salmonid fish located in an ocean cage or a net pen.
The energy required for the artificial light source according to the present invention can vary from a few watts to several kilowatts depending upon the nature of the artificial light source and the volume of the enclosure or ocean cage or net. The intensity of the light diminishes with the distance between the light source and the target surface, e.g. the surface of the salmon lice. In some cases, and for some useful water-soluble tetrapyrrole compounds, such as positively charged tetrapyrrole compounds or a pharmaceutical acceptable salt thereof, or negatively charged tetrapyrrole compounds or a pharmaceutical acceptable salt thereof, or hydrophilic neutral tetrapyrrole compounds or pharmaceutical acceptable derivates thereof, the light intensity may be too high at a too close distance, leading to a too rapid bleaching of the water-soluble tetrapyrrole compound, and thereby the water-soluble tetrapyrrole compound lose its effect. In some cases, and for some useful water-soluble tetrapyrrole compounds, the light intensity may be too low at a too far distance, leading to that water-soluble tetrapyrrole compound is not activated. It is therefore within the scope of the present invention to optimize the distance between the artificial light source and the salmon lice. The optimal distance is thus dependent on among other things the actual wavelength, the actual water-soluble tetrapyrrole compound, and the actual specification of the lamp, e.g. output in lumen.
The light may comprise of a single light source or a plurality of light sources in a given three-dimensional geometric system to secure optimal efficacy for treatment of fish infected with salmon lice. The light may be placed in air above the bath with fish infected with salmon lice, however, if the volume is large, as with an ocean cage, the light is preferably placed under water. A combination of light above and under water may in some cases be useful. The artificial light source may optionally be placed related to a device where the fish can obtain a fixed dose of light. A typical device where the fish get a fixed dose of light could, for example, be a system comprising of pipes and baths where the water with infected fish is pumped through pipes and kept in baths during light irradiation. For some procedures it might be an advantage to use a combination of blue and red light as an alternative to blue light or red light alone.
Surprisingly it has been found that not only do artificial light and water-soluble tetrapyrrole compounds according to the present invention together have an additional effect on salmon lice but that light from an artificial light source and water-soluble tetrapyrrole together have a synergistic effect. The exact mechanism of the combination of light together with the water-soluble tetrapyrrole compounds on salmon lice is not studied, but it can be speculated that the artificial light activates the water-soluble tetrapyrrole compounds through a photochemical process and that the formed reactive species are responsible for the observed increased toxicity on the salmon lice. This mode of action is seen in photodynamic therapy. The water-soluble tetrapyrrole compound and derivates thereof may act as a photosensitizer. The inventors have performed some simple experiments related to light penetration through lice and salmon skin. The overall conclusion is the unexpected result that light easily penetrate salmon lice while light of different wave lengths do not penetrate salmon skin. Based on this result and the speculated mechanism of action discussed above, the method described herein seems to be effective to kill salmon lice with an acceptable toxicity for the fish.
Said water-soluble tetrapyrrole compound may comprise a water-soluble tetrapyrrole derivative. Said water-soluble tetrapyrrole derivative may be a toxicologically acceptable salt of a tetrapyrrole compound. By the term “toxicologically acceptable” in this text is meant that the aqueous concentration of the tetrapyrrole compound used to treat lice, is acceptable for the fish. The adverse events for the fish by applying the present treatment are equal to or less than adverse events seen in other state of the art methods for treatment of salmon lice infected fish. Said water-soluble tetrapyrrole derivative may be in the form of a cyclodextrin complex where the cyclodextrin complex comprises a water-soluble tetrapyrrole compound.
The said water-soluble tetrapyrrole compound can be a derivative comprising one or more salt-forming functional groups or one or more neutral hydrophilic groups.
The artificial light source may comprise of LED lamps. The wavelength of the emitted light from the artificial light source may be between 200 and 800nm. The wavelength of the emitted light may be between 400 and 800nm. The wavelength of the emitted light may be between 200 and 400nm. The wavelength of the emitted light may be between 200 and 300nm.
Said artificial light source, for example a laser, may be a part of a device for automatic localization of salmon lice. Said artificial light source may be a light source used in cultivation or farming of salmonid fish. Said water-soluble tetrapyrrole compound may be added in a food pellet for feeding the salmonid fish. Said water-soluble tetrapyrrole compound may be added in the water surrounding the salmonid fish. An artificial light device may be used according to the methods described above.
The present invention may relate to a treatment of salmon louse in farmed fish populations that comprises a combination of water-soluble tetrapyrrole compounds according to the present invention and artificial light.
The present invention may relate to a protocol for the present treatment. Suitably, the water-soluble tetrapyrrole compound is administered prior to, after or at approximately the same time as the artificial light.
The present invention may relate to a protocol for the present treatment. The present treatment can be performed when the Atlantic salmon is in receptacles or enclosures, e.g. closed tanks or semi-closed tanks, pipes, chambers, containers, fishponds, ocean cages or net pens or a combination of such enclosures.
The present invention may relate to the artificial light source. The light source according to the present invention can be a light source positioned in the air or placed in water. The light source can optionally be a plurality of light sources. The light source should generate light with wave lengths from 200 to 800nm. The light source might also generate electromagnetic radiation that is outside this range. The light source might be in the form of a laser. The light source or light systems may comprise halogen lamps, mercury lamps, light emitting diodes (LEDs) or other suitable light systems. The light source can be a stationary light source or a movable light source.
The present invention may relate to a drug treatment protocol. Optionally, according to the present invention other drug substances or drug like compounds might, in addition to the water-soluble tetrapyrrole, be useful for the treatment according to the present invention. These drugs include other drugs that have been shown to be toxic to salmon lice including commercial products that are approved for salmon lice infections in Atlantic salmon.
The present invention may relate to the dose or concentration of water-soluble tetrapyrrole or pharmaceutically acceptable salts thereof in the clinical situation.
The present invention may relate to the exposure time of the treatment process. The time necessary to perform the present process varies from minutes to hours depending upon several factors like for example nature of the salmon lice infection, number of Atlantic salmon per cubic meter of water, concentration of the water-soluble tetrapyrrole or pharmaceutically acceptable salts thereof in the water and optionally other drugs and drug like compounds and nature of the artificial light source.
The present invention may relate to resistance. The method according to the present invention is new for treatment of Atlantic salmon infected by salmon lice and has advantages related to treatment of Atlantic salmon infected by resistant salmon lice and also related to generation of new forms of resistance. The possible mechanism of action related to the present invention is biologically not a typical process where resistance processes are generated.
The advantages by a combination of artificial light together with water-soluble tetrapyrrole compounds according to the present invention versus state-of-the-art treatment of salmon lice relate to one or more of the following topics: reduced amount of drugs, improved efficacy on salmon lice, reduced toxicity to the Atlantic salmon, resistance issues, cost and time.
Detailed description of the present invention
Surprisingly it has been found a new method for treatment of salmon lice (L. salmonis and C. rogercresseyi, Caligus spp.) in farmed fish such as Atlantic salmon (S. salar L.) using an artificial light source and at least one chemical substance at toxicologically acceptable concentrations for Atlantic salmon.
The present invention relates to water-soluble tetrapyrrole compounds. More specifically, the invention relates in a first aspect to a composition in the form of an aqueous solution comprising a tetrapyrrole for use in a method of therapy using artificial light for an external crustacean parasite infection in salmonid fish, said external crustacean parasite infection comprises an infection of salmon lice, Lepeophtheirus salmonis, Caligus rogercresseyi and Caligus spp.
In one embodiment said water-soluble tetrapyrrole compound for use in a method of photodynamic therapy for an external crustacean parasite infection in salmonid fish is a water-soluble tetrapyrrole compound comprising one or more basic groups, such as aliphatic amino groups, or permanently charged nitrogen-comprising groups such as quaternary ammonium salts, one or more acidic groups such as sulfonic acid groups, phosphate groups or carboxylic groups, and/or one or more neutral hydrophilic groups like alcohols, phenols and/or polyethylene glycol.
The term “water-soluble tetrapyrrole compound” is herein any form of the tetrapyrrole compound on neutral or charged form. If the water-soluble tetrapyrrole compound is on charged form, the compound is in the form of a salt. Water-soluble tetrapyrrole salts are, according to the present invention any salt that is sufficient soluble in sea water, are toxic to salmon lice and are not toxic for fish including salmon with or without light. For tetrapyrroles with basic groups typical salts are formed with acids like hydrochloric acid, sulfuric acid, phosphoric acid, succinic acid and other typical nontoxic acids used in pharmaceuticals for veterinary or human use. For tetrapyrroles with acidic groups typical salts are formed with bases like sodium hydroxide, calcium hydroxide, magnesium hydroxide, amine salts and other typical non-toxic bases used in pharmaceuticals for veterinary or human use. The term “water-soluble tetrapyrrole compound” can also be the tetrapyrrole derivative (as salt or not as salt) in the form of a complex with cyclodextrin.
The chemical group called cyclodextrin (CD) includes alpha-CD which is a 6-membered sugar ring molecule, beta-CD which is a 7-membered sugar ring molecule, gamma-CD which is a 7-membered sugar ring molecule and an almost unlimited number of chemical derivatives with various degree of substitution on these three different sugar ring molecules.
Among the preferred water-soluble tetrapyrrole compounds according to the present invention are the corresponding cyclodextrin complexes. Regarding the cyclodextrin part of the water-soluble tetrapyrrole compound of cyclodextrin complexes are the following cyclodextrins preferred: unsubstituted cyclodextrin, methyl cyclodextrin and 2-hydroxypropyl cyclodextrin, and sulphobutyl-cyclodextrin. The most preferred cyclodextrins have a 7-membered sugar ring molecular structure.
The term “water-soluble tetrapyrrole compound” also includes compounds where the tetrapyrrole ring system incorporates a metal ion.
Very many photoactive compounds described in the scientific literature are so-called “tetrapyrroles”. This term relates to cyclic compounds comprising four 5-membered rings comprising a nitrogen atom. A typical tetrapyrrole core is porphyrin shown below.
Porphyrin
The tetrapyrrole structures can be with various degrees of chemical double bonds as shown below forming different chemical ring structures. Chlorins and bacteriochlorins are reduced versions of porphyrin often referred to as hydroporphyrins. Chlorins have one reduced double bond while bacteriochlorins have two reduced double bonds. In phthalocyanines the four pyrrole ring structures are condensed with benzene rings.
The tetrapyrrole ring structure might optionally be condensed with other ring systems then benzene rings; for example a heterocyclic ring like pyridine.
Porphyrin Chlorin Bacteriochlorin
Phthalocyanine
The present invention relates to water-soluble tetrapyrrole compounds with or without additional ring systems. Methods for synthesis of water-soluble derivatives are well described in the scientific literature and patent literature, e.g. EP2464384. See for example Michael Luciano et al., 2017, Modifications of porphyrins and hydroporphyrins for their solubilization in aqueous media in Molecules: 22, 980, and references herein.
The abovementioned functional groups might be attached directly or indirectly to the tetrapyrrole ring or might be incorporated or attached to an additional ring system.
Talporfin is a substance in a drug (Laserphyrin®) for treatment of lung cancer in humans in Japan. Talporfin is a chlorin derivative. This is an example where three of four water-solubilizing groups, i.e. four acidic groups are indirectly bond to the tetrapyrrole derived ring system and one acidic group is directly bond.
Talporfin
Temoporfin is the substance in a drug (Foscan ®) for treatment of head and neck cancer in humans. This is an example where the solubilizing phenolic groups are attached to an additional ring system. Phthalocyanines can also be modified to become watersoluble compounds by covalent attachment of water-solubilizing functional groups directly or indirectly to additional rings.
Temoporfin
Some preferred water-soluble tetrapyrrole compounds to be used according to the present invention include:
● Tetrapyrrole compounds with carboxylate functional groups (typically 1 to 6 carboxylic groups), except for chlorophyllin.
● Sulfonated tetrapyrrole compounds, typically with one to four sulphonic acid groups
● Phosphate/phosphonate tetrapyrrole compounds, typically with one to six phosphate and/or phosphonate groups
● 4-pyridinium-tetrapyrrole compounds, typically with one to four pyridinium groups
● Other pyridyl-substituted tetrapyrrole compounds
● Imidazolium-tetrapyrrole compounds
● Tetrapyrrole compounds comprising alcohol, phenol, ether; typically PEGylated tetrapyrrole; typically with more than one oxygen-comprising functional group The above-mentioned compounds are preferably in the form of a pharmaceutically acceptable salt if the tetrapyrrole compound comprises one or more acidic and/or basic group. For a given tetrapyrrole salt, the stoichiometric ratio between the ions might vary; for example, a tetrapyrrole phosphate ester might be in the form of monosodium salt or disodium salt.
The water-soluble tetrapyrrole compounds according to the present invention are easily available:
● Several compounds are commercially available from different vendors.
● Very many compounds are described in the scientific literature and patent literature with synthetic methods and chemical characterization methods and data. ● A person skilled in the art can utilize standard organic methods for preparation of compounds.
The present invention does not claim any new chemical compounds per se.
Salts of water-soluble tetrapyrrole compounds can easily be prepared by standard methods using an acidic compound and a basic compound. Such methods typically include mixing of relevant molecular ratios of acids and bases in an appropriate solvent, optionally heating and then isolation by evaporation or precipitation. The watersoluble salt is dried using standard methods; air drying, head drying, vacuum drying and spray drying. The water-soluble tetrapyrrole cyclodextrin complexes according to the present invention can be prepared by standard methods for preparation of such complexes. These methods include co-evaporation, spray-drying, freeze drying and kneading. One simple method is to carefully mix the water-soluble tetrapyrrole with the cyclodextrin (typically molar ratio 1 to 5) with small amounts of water forming a very thick paste for 10 minutes using a mortar and pestle, dry the paste in an oven and prepare a powder of the dry material using the mortar and pestle.
The actual aqueous concentration of water-soluble tetrapyrrole compounds in the clinical situation to remove salmon lice from fish, varies depending upon the various parameters like for example choice of water-soluble tetrapyrrole compound, temperature, disease stage, light source and the density of Atlantic salmon. Typical concentration range for the water-soluble tetrapyrrole compound according to the present invention is in the range of 0.01 micromolar (10<-8 >M) to 400 micromolar (400 times 10<-6 >M). More preferred the concentration range for the water-soluble tetrapyrrole compounds according to the present invention is in the range 0.1 micromolar to 200 micromolar.
The present invention relates to treatment of salmon louse in farmed fish populations that comprises a combination of water-soluble tetrapyrrole compounds and light from an artificial light source.
The present invention relates to a protocol for the present treatment. Suitably, watersoluble tetrapyrrole compound(s) are administered prior to, after or at approximately the same time as the light.
The light might be present after the water-soluble tetrapyrrole compound concentration around the Atlantic salmon is reduced. Any protocol using water-soluble tetrapyrrole and light is within the scope of the present invention. It is up to the skilled person on salmon lice treatment to select the best suited protocol for each treatment.
A first preferred protocol is to apply the water-soluble tetrapyrrole some time prior to the light treatment. In this case the light and the water-soluble tetrapyrrole are present partly together and optionally continue to use light after the aqueous concentration of the water-soluble tetrapyrrole is reduced.
A second preferred protocol is to apply water-soluble tetrapyrrole and artificial light treatment together and optionally continue to use light after the aqueous concentration of the water-soluble tetrapyrrole is reduced.
A third preferred protocol is to apply light after the aqueous concentration of the water-soluble tetrapyrrole is reduced but the water-soluble tetrapyrrole still is present within the salmon lice.
The most preferred protocol is to apply light, at least partly, when the concentration of the water-soluble tetrapyrrole compounds still is quite high in the water surrounding the Atlantic salmon and the salmon lice.
The present invention relates to a protocol for the present treatment. The present treatment can be performed when the Atlantic salmon is in receptacles or enclosures, e.g. closed tanks or semi-closed tanks, pipes, chambers, containers, fishponds, ocean cages or net pens or a combination of such enclosures.
The preferred methods of the present invention relate to treatment of Atlantic salmon with salmon lice within a tank/boat or ocean cages or net pens. The absolutely most preferred methods of the present invention relate to treatment of Atlantic salmon infected with salmon lice within an ocean cage or a net pen.
The present invention relates to the position of the artificial light source. One preferred position of the light source is in the air above the water. Another preferred position of the light source is on the walls or the bottom of a receptacle or enclosure, e.g. closed tank or semi-closed tank, pipe, chamber, container, or fishponds. Another preferred position of the light source is under water within the receptacle or the ocean cage or net by mechanical arrangements and/or floating devices. The most preferred position of the light source in a large ocean cage or net is under water.
The artificial light source should generate light that has wave lengths from 200nm to 800nm. One preferred artificial light source according to the present invention is that the artificial light source generates visible light within the wavelength band from 400nm to 800nm.
One preferred artificial light source according to the present invention is that the artificial light source generates light within one of the following colors: red, yellow, green, or blue. The artificial light source may generate white light.
Another preferred light source according to the present invention is that the artificial light source generates UV light within the wavelength band from 200nm to 400nm.
Another preferred artificial light source according to the present invention is that the artificial light source generates UVC light within the wavelength band from 200nm to 300nm.
The artificial light source might also generate electromagnetic radiation that is outside these wavelength bands. If so, the artificial light source must also generate some light within referred wave lengths or colors.
The artificial light source can be one single artificial light source or a plurality of artificial light sources. If the volume is huge, like in an ocean cage or net, it is according to the present invention preferred to use a plurality of artificial light sources.
One artificial preferred light source according to the present invention is that the artificial light source is based on laser.
Another preferred artificial light source according to the present invention is that the artificial light source is based on LEDs, halogen lamp or mercury lamp. The most preferred type of lamps among these lamps are LED lamps.
The most preferred artificial light sources according to the present invention are LED lamps generating blue light; typically, in the wavelength range from 380nm to 500nm.
Examples of such lamps are optionally dimmable, underwater lamps currently commercially available and used in aquaculture for other purposes.
The light from the artificial light source may be stationary, i.e. same light in the same area over time, or the artificial light source may be movable.
The present invention relates to a drug treatment protocol. Optionally, according to the present invention, other drug substances or drug like compounds may, in addition to water-soluble tetrapyrrole, be useful for the treatment according to the present invention. One preferred treatment protocol according to the present invention is that the other drug substances or drug like compounds are selected among other drugs that are regulatory approved for use to treat Atlantic salmon infected by salmon lice. Another preferred treatment protocol according to the present invention is that the other drug substances or drug like compounds that are cholinesterase inhibitors, synthetic pyrethroids, chitin synthase inhibitors or glutamate-based chlorine ion channel regulators.
Another preferred treatment protocol according to the present invention is that the other drug substances or drug like compounds are selected among compounds that are water-soluble tetrapyrrole compounds. Another preferred treatment protocol according to the present invention is that the other drug substances or drug like compounds are selected among compounds that are phototoxic.
The present invention relates to the dose or concentration of the water-soluble tetrapyrrole in the clinical situation.
The present invention relates to the timing of the treatment process. The time necessary to perform the present process varies from minutes to hours depending upon several factors like for example nature of the salmon lice infection, number of Atlantic salmons per cubic meter, the nature and the concentration of the water-soluble tetrapyrrole and optionally other drugs and drug like compounds, and nature of the light source.
The present invention relates to resistance. The method according to the present invention is new for treatment of Atlantic salmon infected by salmon lice and has advantages related to treatment of Atlantic salmon infected by resistant salmon lice and also relates to generation of new forms of resistance. The possible mechanism of action related to the present invention is biologically not a typical process where resistance processes are generated.
The present invention relates to compositions. The composition might be in the form of liquid concentrated solution or in the form of a solid powder. The concentrated solution is diluted with sea water before use. The solid powder is typically dissolved to a concentrated solution and further diluted with sea water before use or optionally dissolved directly in sea water. The solutions comprise one or more solvents. The solvents are selected among toxicologically acceptable solvents or solvent mixtures typically for example selected from water, sea water, ethanol, isopropanol, glycerol, dimethyl sulfoxide, dimethyl formamide, acetone and low molecular weight polyethylene glycols. The concentrate might typically comprise additional non-toxic additives like surfactants and solubilizers used in pharmaceutical compositions for human and animal medical products. These additives include polysorbates like for example Polysorbate 20 and Polysorbate 80, polyoxyethylene (PEG) castor oil derivatives, polyoxamers, glycerol esters and other ionic and non-ionic surfactants and solubilizers. Anionic surfactants are, according to the present invention, the most preferred group of ionic surfactants. However, the most preferred surfactants, according to the present invention, are non-ionic surfactants. Both ionic and non-ionic surfactants might work as solubilizers. The powder can be the water soluble tetrapyrrole active substance without any additives or a powder mixture comprising various additives. The additives to be optionally used in the present compositions include typical excipients used in pharmaceutical formulations like binders, carriers, coatings, diluents, disintegrants, stabilizers, surfactants, solubilizers and other typical pharmacologically inactive excipients. Typical dry formulations are, according to the present invention, nonencapsulated dry powder (pure water-soluble tetrapyrrole derivatives or cyclodextrin derivatives thereof optionally mixed with additives), granulates comprising watersoluble tetrapyrrole derivatives or cyclodextrin derivatives thereof and dry powder or granulate comprising water-soluble tetrapyrrole derivatives or cyclodextrin derivatives thereof in water-soluble polymer bags, typically polyvinyl alcohol bags. Granulates can typically be prepared using standard granulation methods for example well known in the field of tableting. For granulation methods see for example Dilip M. Parikh (Ed.) Handbook of Pharmaceutical Granulation Technology, Second Edition (2005) Taylor&Francis Group, Florida, USA.
The advantages by a combination of light together with water-soluble tetrapyrrole defined in the present invention relate to one or more of the following topics: reduced amount of drugs, reduction of environmental issues, no resistance development, improved efficacy on salmon lice, and reduced toxicity to the Atlantic salmon.
Experimental
Example 1
Copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt - 2-hydroxypropyl-beta-cyclodextrin complex
Copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt (Aldrich 245356-5G SDS) (mv 984.2, 492 mg, 0.5 mmol) and 2-hydroxypropyl-beta-cyclodextrin (Biosynth) (mw 1460, 3.65 g, 2.5 mmol) were mixed volumetrically in a mortar. Water (2 ml) was added, and the blue paste was vigorously mixed in the mortar and then dried in an oven at 60 °C for 24 hours. The content was pulverized in the mortar. The title compound comprised 11.9 weight-% copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt.
Example 2
Copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt - betacyclodextrin sulfobutyl ether sodium salt complex
Copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt (Aldrich 245356-5G SDS) (mv 984.2, 98 mg, 0.1 mmol) and beta-cyclodextrin sulfobutyl ether sodium salt (Biosynth OC15979) (mw 2242, 2.24 g, 1 mmol) were mixed volumetrically in a mortar. Water (2 ml) was added, and the blue paste was vigorously mixed in the mortar and then dried in an oven at 60 °C for 24 hours. The content was pulverized in the mortar. The title compound comprised 4.2 weight-% copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt.
Example 3
4,4′,4″,4″′-(porphine-5,10,15,20-tetrayl)tetrakis(benzenesulfonic acid) - beta-cyclodextrin sulfobutyl ether sodium salt complex
4,4′,4″,4″′-(porphine-5,10,15,20-tetrayl)tetrakis(benzenesulfonic acid) (Sigma-Aldrich)89456-100MG-F) (mw 935, 9 mg, 0.01 mmol) and beta-cyclodextrin sulfobutyl ether sodium salt (Biosynth OC15979) (mw 2242, 0.22 g, 0.1 mmol) were mixed volumetrically in a mortar. Water (0.2 ml) was added, and the blue paste was vigorously mixed in the mortar and then dried in an oven at 60 °C for 24 hours. The content was pulverized in the mortar. The title compound comprised 3.9 weight-% 4,4′,4″,4″′-(porphine-5,10,15,20-tetrayl)tetrakis(benzenesulfonic acid).
Example 4
Copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt - gamma-cyclodextrin complex
Copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt (Aldrich 245356-5G SDS) (mv 984.2, 492 mg, 0.5 mmol) and gamma-cyclodextrin (Wacker Fine Chemicals, Cavamax W8) (mw 1297, 2.40 g, 1.85 mmol) were mixed volumetrically in a mortar. Water (2 ml) was added, and the blue paste was vigorously mixed in the mortar and then dried in an oven at 60 °C for 24 hours. The content was pulverized in the mortar. The title compound comprised 17 weight-% copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt.
Example 5
Copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt - betacyclodextrin complex
Copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt (Aldrich 245356-5G SDS) (mv 984.2, 492 mg, 0.5 mmol) and beta-cyclodextrin (Wacker Fine Chemicals, Cavamax W7 (mw 1135, 3,405g, 3 mmol) were mixed volumetrically in a mortar. Water (2 ml) was added, and the blue paste was vigorously mixed in the mortar and then dried in an oven at 60 °C for 24 hours. The content was pulverized in the mortar. The title compound comprised 11.9 weight-% copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt.
Example 6
Phthalocyanine concentrate for dilution before use
Copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt 500 gram Macrogol glycerol ricinolaeate 15 gram Polysorbate 80 10 gram N-methylpyrrolidon ad. 5 liter
A stirred mixture of macrogol glycerol ricinolaeate, polysorbate 80 and N-methylpyrrolidone (3 liter) are heated to 60 °C. Copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt is added. Additional N-methylpyrrolidon to a total volume of 5 liter is added and the mixture was stirred for 10 minutes, cooled and filled on one-liter bottles. One liter comprises 100 gram copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt.
Example 7
Bag comprising dry powder of porphine - cyclodextrin complex
4,4′,4″,4″′-(porphine-5,10,15,20-tetrayl)tetrakis(benzenesulfonic acid) - betacyclodextrin sulfobutyl ether sodium salt complex 100 gram Kaolin 350 gram Silica 50 gram
The components are volumetrically mixed and filled into polymer bags made from polvinylalcohol. Each bag comprises 100 gram dry powder (20 gram 4,4′,4″,4″′-(porphine-5,10,15,20-tetrayl)tetrakis(benzenesulfonic acid) - beta-cyclodextrin sulfobutyl ether sodium salt complex.)
Example 8
Solubility and dispersibility studies in sea water
Copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt. Visual solubility in sea water appr. 20 mg/liter at 20 °C. Dissolves over time. Blue solution.
The tetrapyrrole cyclodextrin complexes showed typically a visual solubility in sea water more than appr. 100 mg/liter at 20 °C. The tetrapyrrole cyclodextrin complexes typically dissolve fast in sea water and are typically very dispersible in sea water.
Example 9
Evaluation of clinical efficacy of positively charged porphyrin to kill salmon lice (dark and blue light)
Drug: 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin tetra(p-toluenesulfonate) 20 microM Molecular weight is 1363.60 D.
(Synonym: meso-tetra(N-methyl-4-pyridyl)porphine tetratosylate salt; TMPyP) from Merck (Sigma Aldrich) 323497-250MG
Blue light: 100 blue LED lamp array (10 x 10) is mounted on a heat sink and cooled by an external fan. Specifications: 450-460nm, DC32-36V, 3500mA (100W), Luminous flux: 1000-1500lm.
Two dark controls (A and B): Sea water (A); and drug (20 microM) in sea water (B)
Blue light control: Sea water no drug (C)
Blue light: Drug (20 microM) in sea water (D).
All bioassays are conducted at a constant water temperature of 12°C. Numbers of live and dead salmon lice were evaluated during four hours after onset of experiments.
Expected result: No dead salmon lice are observed in controls (A, B and C). Dead salmon lice are observed in experiment with blue light and water-soluble tetrapyrrole compound (D).
Example 10
Evaluation of clinical efficacy of negatively charged porphyrin to kill salmon lice (dark and blue light)
Drug: 4,4′,4″,4’’’-(porphine-5,10,15,20-tetrayl)tetrakis(benzenesulfonic acid) (Synonym: meso-tetraphenylporphine-4,4′,4″,4’’’-tetrasulfonic acid) from Merck (Sigma Aldrich) 89456-100MG
Two dark controls (A and B): Sea water (A) and drug (10 microM) in sea water (B) Blue light control: Sea water no drug (C)
Blue light: Drug (10 microM) in sea water (D).
All bioassays are conducted at a constant water temperature of 12°C. Numbers of live and dead salmon lice were evaluated during four hours after onset of experiments.
Expected result: No dead salmon lice are observed in controls (A, B and C). Dead salmon lice are observed in experiment with blue light and water-soluble tetrapyrrole compound (D).
Example 11
Evaluation of clinical efficacy of positively charged porphyrin to kill salmon lice (dark, white light and blue light)
Drug: Copper phthalocyanine-3,4′,4″,4″′-tetrasulfonic acid tetrasodium salt from Merck (Sigma Aldrich) 245356-1G
Two dark controls (A and B): Sea water (A) and drug (10 microM) in sea water (B)
Blue light control: Sea water no drug (C)
White light control: Sea water no drug (D)
Blue light: Drug (10 microM) in sea water (E).
White light: Drug (10 microM) in sea water (F).
All bioassays are conducted at a constant water temperature of 12°C. Numbers of live and dead salmon lice were evaluated during four hours after onset of experiments.
Expected result: No dead salmon lice are observed in controls (A, B, C and D). Dead salmon lice are observed in experiments with light and water-soluble tetrapyrrole compound. More and/or faster killing of salmon lice is observed with blue light plus water-soluble tetrapyrrole compound (E) than with white light plus water-soluble tetrapyrrole compound (F).
Claims (5)
1. Composition in the form of an aqueous solution comprising a chemical compound for use in a method of therapy using artificial light for an external crustacean parasite infection in salmonid fish, said external crustacean parasite infection comprises an infection of salmon lice, Lepeophtheirus salmonis, Caligus rogercresseyi and Caligus spp., wherein said chemical compound is a water-soluble cyclic tetrapyrrole compound, the cyclic tetrapyrrole compound is a member of a group consisting of porphin, porphyrins, chlorins, bacteriochlorins, phthalocyanines and pharmaceutical acceptable derivatives of porphyrins, chlorins, bacteriochlorins, and phthalocyanines, with the proviso that the water-soluble cyclic tetrapyrrole compound is not chlorophyllin.
2. The composition according to claim 1, wherein said water-soluble cyclic tetrapyrrole compound is in a form of a toxicologically acceptable salt.
3. The composition according to claim 2, wherein the water-soluble cyclic tetrapyrrole compound comprises sulphonic acid.
4. The composition according to claim 3, wherein a sulfonated water-soluble cyclic tetrapyrrole compound comprises one to four sulfonic acid groups.
5. The composition according to any one of claim 1 to 4, wherein said watersoluble cyclic tetrapyrrole compound is in a form of a toxicologically acceptable cyclodextrin complex.
O v e r s a t t e k r a v
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20200710 | 2020-06-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NO20210775A1 NO20210775A1 (en) | 2021-12-20 |
| NO347612B1 true NO347612B1 (en) | 2024-01-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO20210775A NO347612B1 (en) | 2020-06-17 | 2021-06-16 | Method for removing crustacean ectoparasites from farmed salmonid fish using water-soluble tetrapyrrole compounds and light |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4167729A4 (en) |
| CA (1) | CA3181123A1 (en) |
| CL (1) | CL2022003628A1 (en) |
| DK (1) | DK202270639A1 (en) |
| NO (1) | NO347612B1 (en) |
| WO (1) | WO2021256938A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020103246A1 (en) * | 1999-03-10 | 2002-08-01 | Moshe Schaffer | Utilization of porphyrin derivatives in aquaria |
| WO2010014728A1 (en) * | 2008-07-29 | 2010-02-04 | Frontier Scientific Inc. | Use of tetrakis (n-alkylpyridinium) -porphyrin derivatives for killing microbes or preventing growth |
| US20140179742A1 (en) * | 2008-07-29 | 2014-06-26 | Frontier Scientific, Inc. | Compositions for killing or preventing the growth of microbes |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO346510B1 (en) * | 2018-12-17 | 2022-09-12 | Mowi ASA | Method for removing crustacean ectoparasites from farmed salmonid fish using edible additives and light |
-
2021
- 2021-06-16 EP EP21825236.9A patent/EP4167729A4/en active Pending
- 2021-06-16 NO NO20210775A patent/NO347612B1/en unknown
- 2021-06-16 DK DKPA202270639 patent/DK202270639A1/en unknown
- 2021-06-16 WO PCT/NO2021/050146 patent/WO2021256938A1/en active Application Filing
- 2021-06-16 CA CA3181123A patent/CA3181123A1/en active Pending
-
2022
- 2022-12-16 CL CL2022003628A patent/CL2022003628A1/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020103246A1 (en) * | 1999-03-10 | 2002-08-01 | Moshe Schaffer | Utilization of porphyrin derivatives in aquaria |
| WO2010014728A1 (en) * | 2008-07-29 | 2010-02-04 | Frontier Scientific Inc. | Use of tetrakis (n-alkylpyridinium) -porphyrin derivatives for killing microbes or preventing growth |
| US20140179742A1 (en) * | 2008-07-29 | 2014-06-26 | Frontier Scientific, Inc. | Compositions for killing or preventing the growth of microbes |
Non-Patent Citations (4)
| Title |
|---|
| ALMEIDA, A., et. al., Phage Therapy and Photodynamic Therapy: Low Environmental Impact Approaches to Inactivate Microorganisms in Fish Farming Plants, Mar Drugs. 2009 Sep; 7(3): 268–313., Dated: 01.01.0001 * |
| ALMEIDA, A., et. al., Potential applications of porphyrins in photodynamic inactivation beyond the medical scope, Journal of Photochemistry and Photobiology C: Photochemistry Reviews 22 (2015) 34–57, Dated: 01.01.0001 * |
| HÄDER, D. -P. et. al. Fighting fish parasites with photodynamically active chlorophyllin, Parasitology Research volume 115, pages 2277–2283(2016), Dated: 01.01.0001 * |
| HÄDER, D. -P. et. al., Chlorophyllin as a possible measure against vectors of human parasites and fish parasites, Review article, June 2014, volume 2, article 18, Frontiers in environmental science, Dated: 01.01.0001 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CA3181123A1 (en) | 2021-12-23 |
| WO2021256938A1 (en) | 2021-12-23 |
| EP4167729A1 (en) | 2023-04-26 |
| NO20210775A1 (en) | 2021-12-20 |
| DK202270639A1 (en) | 2023-01-06 |
| CL2022003628A1 (en) | 2023-06-23 |
| EP4167729A4 (en) | 2024-06-26 |
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