Defined dose therapeutic phage

• US 20070020240A1
• Filed: 10/06/2004
• Published: 01/25/2007
• Est. Priority Date: 10/06/2003
• Status: Abandoned Application

• Current Assignee: Gangagen Inc.
• Original Assignee: Gangagen Inc.
• Inventors: Padmanabhan, Sriram, Sriram, Bharathi, Jayasheela, M.
• Application Number:
  US10/574,812
• Publication Number:
  US 20070020240A1
• Time in Patent Office: Days
• US Class Current: 424/93.600
• CPC Class Codes: A61K 35/76 Viruses; Subviral particles; Bacteriophages
• CPC Class Codes: A61P 29/00 Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
• CPC Class Codes: A61P 31/00 Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
• CPC Class Codes: A61P 31/04 Antibacterial agents
• CPC Class Codes: C12N 15/1075 by coupling phenotype to genotype, not provided for in other groups of this subclass
• CPC Class Codes: C12N 2795/00032 Use of virus as therapeutic agent, other than vaccine, e.g. as cytolytic agent
• CPC Class Codes: C12N 2795/00061 Methods of inactivation or attenuation
• CPC Class Codes: C12N 7/00 Viruses; Bacteriophages; Compositions thereof; Preparation or purification thereof preparing medicinal viral antigen or antibody compositions, e.g. virus vaccines, A61K39/00

Abstract

The invention provides therapeutic, defined-dose anti-bacterial phage preparations, methods to make such preparations, methods to treat bacterial infections using such preparations and methods to diagnose bacterial infections using such preparations.

Claims

1. A method of making a non-replicating anti-bacterial phage, said method comprising the step of producing said anti-bacterial phage in a host production bacterium, wherein said anti-bacterial phage is unable to replicate in a target bacterium and wherein said anti-bacterial phage inhibits growth of said target bacterium.

2. The method of claim 1, wherein said non-replicating anti-bacterial phage is unable to replicate in said target bacterium because:

the nucleic acid of said anti-bacterial phage is inactivated or removed;

said phage comprises a mutation and cannot assemble into a replication competent phage in said target bacterium, but said host production bacterium is a complementing host bacterium that is able to complement, including with a helper phage, said mutation of said anti-bacterial phage and allow replication of said anti-bacterial phage in said complementing host production bacterium;

said phage comprises DNA containing a restriction site sensitive to a restriction enzyme activity, said activity found in said target bacterium but absent in said host production bacterium;

or

said phage expresses in said target bacterium a fumction early in infection which prevents DNA or phage replication, but fails to express said function in said host production bacterium.

3. The method of claim 2, wherein:

said mutation is temperature sensitive at a non-permissive temperature, and said complementing host production bacterium complements said mutation at said non-permissive temperature;

a nucleic acid of said non-replicating anti-bacterial phage comprises a mutation and cannot assemble into a replication competent phage, further comprising a step of supplying a complementing helper phage that can complement said mutation of said anti-bacterial phage and allow replication of said anti-bacterial phage in said host production bacterium;

said mutation is a substantial deletion, and said complementing host production bacterium complements said deletion mutation, e.g., with a gene in said host production bacterium or a helper phage;

said host production bacterium expresses an inhibitor of expression or function of said restriction enzyme;

said function early in infection is a nuclease which prevents DNA or phage replication;

or

said function early in infection is blocked in said host production bacterium by antisense message expression.

4. A pharmaceutically acceptable complementing host production bacterium used in a method of claim 1.

5. A pharmaceutical composition comprising an anti-bacterial phage, wherein said anti-bacterial phage inhibits growth of a target bacterium, and wherein said anti-bacterial phage has diminished replication activity in said target bacterium.

6. The composition of claim 5, wherein:

said anti-bacterial phage exhibits no DNA or phage replication activity in said target bacterium;

said anti-bacterial phage comprises less than 98% of the complexity of the nucleic acid of an intact phage;

said anti-bacterial phage comprises les than 20% of the nucleic acid content of an intact parental phage;

said anti-bacterial phage comprises less than 2% of the nucleic acid content of the intact parental phage;

said anti-bacterial phage does not contain detectable nucleic acid;

said anti-bacterial phage comprises an intact phage comprising nucleic acid with a reduced replication capacity in said target bacterium;

said anti-bacterial phage comprises a tail portion of a tailed phage, including a myoviridae or syphoviridae phage;

said anti-bacterial phage comprises an electron microscope morphologically identifiable tail portion of a tailed phage;

said anti-bacterial phage consists essentially of a tail portion of a myoviridae or syphoviridae phage;

said composition fiurther comprises a therapeutically compatible buffer or excipient;

said composition further comprises a second therapeutic agent, including an anti-microbial, antibiotic, or inflammatory agent;

said anti-bacterial phage is made by a method comprising the steps of;

a) amplifying a phage in a host production bacterium,

b) harvesting said phage from said host production bacterial culture, and

c) depleting or inactivating substantially all of the nucleic acids from said phage, thereby producing said anti-bacterial phage;

said anti-bacterial phage is made by a method comprising steps of;

a) amplifying a phage in a host production bacterium, and

b) harvesting said phage from said host production bacterial culture before substantial amounts of intact phage are produced or assembled, thereby producing said anti-bacterial phage;

or

said anti-bacterial phage is made by a method comprising steps of;

a) amplifying a phage in a host production bacterium, and

b) harvesting said phage from said host production bacterial culture, wherein a nucleic acid of said anti-bacterial phage comprises a mutation and cannot assemble into a replication competent phage, and wherein said host production bacterium is a complementing host production bacterium that is able to complement said mutation of said anti-bacterial phage and allow replication of said anti-bacterial phage in said complementing host production bacterium, including where said complementing results from a helper phage, thereby producing said anti-bacterial phage.

7. A method of treating a bacterial population:

in a subject in need of said treatment, said method comprising administering a therapeutically effective amount of a composition of claim 5;

or

in a subject, said method comprising administering a prophylactically effective amount of a composition of claim 5.

8. The method of claim 7, wherein:

said bacterial infection is caused by said target bacterium;

said subject is a human;

said subject is a primate, a food, work, display, or a companion animal;

said target bacterium is Escherichia, Staphylococcus, Pseudomonas, or Streptococcus;

said method further comprises administering a second therapeutic or antimicrobial agent, including administering systemically, parenterally, orally, topically, or by inhalation, catheter, or drain tube;

said method results in a relative decrease in said population of at least 10-1000 fold;

or

said method results in a decrease in detectability of said population by at least 5-50 fold.

9. A pharmaceutical composition comprising a genetically incompetent anti-bacterial phage, wherein said anti-bacterial phage inhibits growth of a target bacterium.

10. The pharmaceutical composition of claim 9, wherein:

said target bacterium is identified or diagnosed, including an Escherichia, Staphylococcus, Pseudomonas, or Streptococcus bacterium;

said genetically incompetent anti-bacterial phage lacks a full complement of genetic material;

said genetically incompetent anti-bacterial phage has a mutation and cannot assemble into replication competent phage in said target bacterium;

said genetically incompetent anti-bacterial phage comprises nucleic acid with a reduced replication capacity, e.g., comprising a mutation, including a missense, termination, frameshift, conditional, deletion, or insertion mutation, in a critical phage replication function;

said genetically incompetent anti-bacterial phage consists essentially of a tail portion from a tailed phage, including a myoviridae or syphoviridae phage;

or

said pharmaceutical composition further comprises an excipient, buffer, or a second therapeutic or anti-microbial agent.

11. A method of using a pharmaceutical composition of claim 9 to treat a bacterial infection in a subject in need of such treatment, said method comprising a step of administering a therapeutically effective amount of said pharmaceutical composition.

12. The method of claim 11, wherein:

said subject is a human;

said subject is a primate, a food, work, display, or companion animal;

said pharmaceutical composition is administered systemically, parenterally, orally, topically, or by inhalation, catheter, or drain tube;

or

said pharmaceutical composition is administered in combination with a second therapeutic or anti-bacterial agent, e.g., an anti-microbial, inflammatory, or anti-inflammatory agent.

13. A method of identifying an anti-bacterial phage that is unable to replicate in a selected target bacterium, said method comprising the steps of:

culturing said target bacterium; and

testing various potential anti-bacterial phage, including genetic variants of a phage, for combined properties of inhibition of growth on said target bacterium, and absence of capacity to replicate phage DNA or phage in said target bacterium.

14. An anti-bacterial phage that is identified using said method of claim 13, wherein said phage inhibits growth of a target bacterium and is unable to replicate in said target bacterium. [product by process claim, but might be difficult to enforce]

15. A method of producing non-replicating anti-bacterial phage comprising the steps of:

replicating phage in a host production bacterium,

harvesting said phage from said host production bacterial culture, and

removing substantially all of the function of the nucleic acids from said phage, thereby producing said non-replicating anti-bacterial phage.

16. The method of claim 15, wherein:

said anti-bacterial phage is a tailed phage, including a myoviridae or syphoviridae phage;

said nucleic acids are removed by steps of;

a) separating tails from heads of tailed phage fragments, and

b) isolating said tails;

said function of said nucleic acids is removed by steps of;

a) harvesting said phage before tails and heads have assembled to form an intact phage, and

b) isolating said tails;

said function of said nucleic acids is removed by osmotic shock, a freeze-thaw cycle, a chemical method, or a mechanical method;

or

said function of said nucleic acids is removed by genetic mutation, e.g., a missense, termination, frameshift, conditional, deletion, or insertion mutation.

17. A method of making a defined dose anti-bacterial phage that kills a defined target bacterium, said method comprising producing said anti-bacterial phage in:

a host production bacterium and isolating tail portions separate from DNA containing heads;

a host production bacterium and inactivating nucleic acid of said phage, e.g., by nicking, fragmenting, crosslinking, or chemically modifying said nucleic acid;

a host production bacterium and harvesting components temporally before substantial assembly of complete phage;

a complementing host production bacterium where said anti-bacterial phage would not replicate in said target bacterium;

a host production bacterium comprising a helper phage where said anti-bacterial phage would not replicate in said target bacterium;

or

a permissive production host which phage are non-permissive for replication in target bacterium in a different condition, e.g., temperature.

18. The method of claim 17, wherein:

said anti-bacterial phage is a tailed phage, including a myoviridae or syphoviridae tailed phage;

said anti-bacterial phage is produced in a complementing host production bacterium or with a complementing helper phage, wherein the coding nucleic acid for said anti-bacterial phage comprises, in a critical gene necessary for phage replication in said target bacterium, a mutation, e.g., a missense, termination, frameshift, conditional, deletion, or insertion;

said anti-bacterial phage exhibits less than 5% of the DNA or phage replication activity in said target bacterium compared to that exhibited by intact phage in said host production bacterium;

said anti-bacterial phage exhibits diminished capacity to transmit toxin genes in said target bacteria when compared to intact phage in said host bacterium;

said anti-bacterial phage exhibits diminished immunogenicity compared to intact phage from said host bacteria upon administration to a mammal, e.g., by 30%, 60%, 90%, 95%, or 99%, in immune response or number of epitopes over a period of treatment exposure;

said anti-bacterial phage exhibits no significant DNA replication or phage replication activity in said target bacterium;

said target bacterium is a pathogenic bacterium, including a nosocomial or pyogenic bacterium, a Gram negative bacterium, or an Escherichia, Staphylococcus, Pseudomonas, or Streptococcus bacterium;

said target bacterium is a food or environmental contaminant;

or

a second technique is used to inactivate or remove remaining DNA in said defined dose anti-bacterial phage.

19. The complementing host or helper phage of claim 18B, wherein said host production bacterium or helper phage encodes one or more genes which complement said mutation in said anti-bacterial phage, thereby allowing said anti-bacterial phage to replicate in said producing bacterium.

20. A defined dose therapeutic anti-bacterial composition comprising a phage protein derived from an intact parental phage or prophage, said anti-bacterial composition capable of killing a target bacterium, said anti-bacterial composition exhibiting less than 20% DNA or phage replication activity in said target bacterium, when compared to said intact parental phage or prophage.

21. The composition of claim 20, wherein:

said composition exhibits less than 5% replication activity in said target bacterium when compared to said intact parental phage;

said anti-bacterial phage exhibits diminished capacity to transmit toxin genes in said target bacteria when compared to intact phage in said host bacterium;

said anti-bacterial composition exhibits diminished immunogenicity compared to said intact phage from a host bacteria upon administration to a mammal;

said anti-bacterial phage exhibits no substantial or detectable DNA or phage replication activity in said target bacterium;

said target bacterium is a pathogenic bacterium, including a nosocomial or pyogenic bacterium, or a Gram negative bacterium, such as Escherichia, Staphylococcus, Pseudomonas, or Streptococcus bacterium;

said target bacterium is a food or environmental contaminant;

said composition further comprises a nucleic acid with reduced replication capacity, e.g., where the nucleic acid has been nicked, fragmented, cross linked, or UV irradiated;

said composition comprises less than 20% of the nucleic acid content of said intact parental phage;

said composition lacks detectable nucleic acid;

said composition comprises a damaged DNA that is unable to be replicated;

said intact parental phage is a tailed phage, including a myoviridae or syphoviridae phage, and said composition comprises a tail portion or a tail protein;

said composition further comprises a therapeutically compatible buffer or excipient;

said composition further comprises a second therapeutic or anti-microbial agent, e.g., an antibiotic or a bacterial cell wall growth disrupting compound;

said anti-bacterial composition is made by a method comprising the step of processing said intact parental phage to remove or inactivate nucleic acids;

said anti-bacterial composition is made by a method comprising the step of harvesting phage from a host bacterium before intact phage are assembled from components thereof;

or

said anti-bacterial composition is made by a method comprising the step of expressing in a complementing host production strain a phage genome defective in expressing a critical gene for replication, infection, assembly, production, or release by said phage, including where said phage genome comprises a mutation, including a missense, termination, frameshift, conditional, deletion, or insertion, which prevents phage replication in said target bacterium.

22. A method of treating a bacterial colonization in a eukaryote experiencing colonization by said target bacterium, said method comprising administering a composition of claim 20 to said eukaryote.

23. The method of claim 22, wherein:

said eukaryote is a mammal, including a primate;

said eukaryote is a food, work, display, or companion animal;

said target bacterium is a pathogenic, nosocomial, or pyogenic bacterium;

said target bacterium is an Escherichia, Staphylococcus, Pseudomonas, or Streptococcus bacterium;

said composition is administered systemically, parenterally, orally, topically, or by inhalation, catheter, or drain tube;

said colonization has already been treated with an anti-microbial or antibiotic;

said colonization has been diagnosed to be susceptible to the selected composition;

or

said eukaryote is also inoculated with another bacterium to replace said target bacterium.

24. A therapeutic anti-bacterial composition comprising a genetically incompetent phage wherein said phage kills a target bacterium.

25. The composition of claim 24, wherein:

said phage lacks detectable nucleic acid;

said phage comprises a chemically or physically damaged nucleic acid;

said phage lacks a functional gene necessary to replicate phage DNA in said target bacterium, or contains a gene which prevents replication of phage DNA in said target bacterium (restriction/modification or phage exclusion system);

said phage comprises a missense, termination, frameshift, conditional, deletion, or insertion mutation in a gene necessary for phage replication, e.g., capacity to infect, assemble, produce, or release intact phage, or contains a gene whose expression prevents phage replication (restriction/modification system);

said phage comprises a tail protein from a tailed phage;

said composition is used therapeutically to treat a food, work, display, or companion animal, or primate;

said target bacterium is a pathogenic bacterium, e.g., an Escherichia, Staphylococcus, Pseudomonas, or Streptococcus bacterium;

said composition is administered systemically, parenterally, orally, topically, or by inhalation, catheter, or drain tube;

or

said composition is administered in combination with a second therapeutic agent, including an anti-bacterial, inflammatory, or anti-inflammatory agent.