Patent Grant
8617543
The invention relates to Modified mutant collagenase for fat melting application and for scar reduction application.
The instant application contains a Sequence Listing which has been submitted in ASCII format via EFS-Web and is hereby incorporated by reference in its entirety. Said ASCII copy, created on Jan. 30, 2012, is named 8254002.txt and is 26,614 bytes in size.
1) Fat Reduction
Obesity is becoming a huge problem for appearance and for health. Many pharmaceutical companies are developing drugs for people to lose weight. Liposuction is one major remedy to get rid of excess fat, with 700,000 operations each year in the US. However, liposuction is very invasive and cause major side effects. Cellulite cream is a non-invasive method to improve appearance of body areas, which have excess fat. But there is no effective cellulite cream out on the market. The current cellulite cream potentially shrinks the fat cells temporarily, not eliminating them.
Liposuction is a procedure that removes fat under skin mechanically using vacuum (at one negative atmosphere). Cosmetic industry uses liposuction to remove excess fat at specific areas of the male and female human body. Liposuction easily causes infection, bruises, contour deformity, and mechanical damage to tissue under skin. Thus liposuction using mechanical force is not desirable.
Cellulite is a big problem for people. While the current crop of products claiming to reduce or eliminate cellulite is rapidly increasing, research regarding their efficacy remains at a bare minimum. Overall, the research states loud and clear these products don't work but sadly, the lure of these potions is hard to fend off. In fact, according to the American Academy of Dermatology, cellulite is the body's natural way of storing fat in adult women. For some women, especially very thin women, cellulite may only be visible by pinching skin, while for the vast majority of women, some amount of cellulite is always visible.
Cellulite is assumed to be caused by the accumulation of fat cells that protrude or are interlaced with possibly weakened layers of skin. Many companies selling anti-cellulite products have referred to this as “imprisoned fat,” which is actually a decent analogy. What is definitely true is that women are far more prone to cellulite than men, most likely because they have more subcutaneous fat cells in their hips and thighs (Source: Journal of Applied Physiology, April 2002, pages 1611-1618).
There is a lengthy list of products claiming they can be rubbed on the skin and then some how free body fat and improve skin tone to eliminate or reduce the appearance of cellulite. Despite the popularity of these lotions and potions, two questions remain unresolved: (1) the lack of any formulary cohesiveness between products, and (2) any support that these products work (Source: Skin Research and Technology, May 2002, pages 118-124). The European Journal of Dermatology (December 2000, pages 596-603) reviewed 32 cellulite products containing between 4 and 31 ingredients that had few similarities. “Forty-four different botanicals and 39 different emollients were used in the 32 products. Caffeine, present in 14 products, was the most common additive, apparently representing an ‘active’ ingredient. In other respects the compositions of the products were similar to those of skin creams.” Cosmetics companies are throwing in random plants without any proof they can help, and yet the suggestive claims are there to entice consumers to try yet another miracle anti-cellulite potion.
Aminophylline, a prescription bronchodilator (opens lung passageways), gained notoriety as an ingredient in cellulite creams as a result of a study published in Obesity Research (November 1995, Supplemental pages 561S-568S). However, doubt about aminophylline's value was revealed by a study published in Plastic and Reconstructive Surgery (September 1999, pages 1110-1114), which described a double-blind study that compared the effectiveness of three different treatments for cellulite on three different groups of women. So, aminophylline appears not to be the answer for cellulite, though it still shows up in some cellulite creams.
Caffeine is used as an ingredient in cellulite creams because of its distant relationship to aminophylline. There are two studies showing caffeine to have benefit for cellulite, but one was conducted by Johnson & Johnson, which owns RoC and Neutrogena, both companies that sell cellulite creams that contain caffeine, and the other was conducted by cosmetic ingredient manufacturers that sell anti-cellulite compounds (Source: Journal of Cosmetic Science, July-August 2002, pages 209-218). There is no other independent research showing that caffeine provides any benefit for treating cellulite, nor research pointing to how much caffeine is needed to produce results.
2) Scar Reduction
Scar is formed by overgrowth of collagen after wound healing. Most of the scar reduction products contain silicone in a sheet or gel format, and onion extracts (Mederma Skin Care products). It usually takes over 3 months to see some effect, because these products do not contain effective active ingredient such as any form of collagenase which targets the cause of scar formation.
The invention relates to a composition comprising a modified single mutant collagenase ColH-FM, wherein the ColH-FM is a Clostridium histolyticum collagenase ColH (Glu451Asp), with additional peptide motif CKGGRAKDC-G(n), SEQ ID NO: 2, in front of ColH (Glu451Asp), n is 2 to 6. The composition can further comprise carrier that is pharmaceutically acceptable, such as those selected from the group consisting of normal saline, aqueous dextran solution, and aqueous hetastarch solution.
In another aspect, the invention provides a use of ColH-FM in making medicine for reducing the amount of adipose tissue at selected locations in the body, which comprises introducing into said medicine effective amounts of single ColH-FM or the same mutant collagenase plus a N-terminal tag of CKGGRAKDC-G, SEQ ID NO: 2, varying from 2 to 6 Gs or any other peptide which can target to white fat vasculature in human and in animals. Furthermore, the ColH-FM can be used in making medicine for reduction and removal of lipomas, and making medicine for scar reduction.
The invention also relates to a method of reducing the amount of adipose tissue at selected locations in the body, which comprises introducing into said tissue effective amounts of a mutant collagenase or the same mutant collagenase plus a N-terminal tag of CKGGRAKDC-G, SEQ ID NO: 2, (varying from 2 to 6 Gs) or any other peptide which can target to white fat vasculature in human and in animals. In an embodiment, said adipose tissue is subcutaneous. Preferably, the mutant full length ColH is from Clostridium histolyticum. In an embodiment, said mutant ColH is at E451D. In detail, Glutamate at position 451 of ColH is mutated to Aspartate in the stretch of sequence (440DRLTWYEEGGAE451, SEQ ID NO: 3), wherein the activity of ColH mutant is 20% of wild type ColH. Or said mutant ColH is at Glu451 changed to any other residue in 20 amino acids selections, specifically E451A and E451Q. In an embodiment, said mutant collagenase in a pharmaceutically acceptable carrier is injected into said adipose tissue, preferably a solution of mutant Collagenase in a liquid pharmaceutically acceptable carrier is injected, and preferably said carrier is aqueous, more preferably said adipose tissue is subcutaneous and said solution is injected percutaneously at one site or a multiplicity of closely spaced sites. In another embodiment, said modified mutant collagenase in a topical pharmaceutical acceptable carrier which can be delivered into white fat cells under skin or raised scar by transdermal technology, such as Hydroxysome technology. In still another embodiment, the mutant collagenase is introduced in the amount from about 1 to 30 ABC units mutant collagenase (1-50 unit per fat pad in fat rat) per gram of adipose tissue treated. Collagenase ABC activity unit is calculated using Worthington Biochem's collagnease assay protocol (5 hours of incubation) at 37 C. Preferably the mutant collagenase is introduced in a liquid pharmaceutically acceptable carrier in a concentration of from 5 to about 500 ABC units per ml. Also preferably the mutant collagenase is introduced in a topical cream pharmaceutically acceptable carrier in a concentration of from 5 to about 500 ABC units per ml. In another embodiment, said mutant collagenase in a pharmaceutically acceptable carrier is injected into said lipoma. Said mutant collagenase in a pharmaceutically acceptable carrier is injected into fat pad as a chemical liposuction agent.
According to the invention, the mutant collagenase of the invention in the company of transdermal technology can be used as a cellulite cream, or topical cream which replaces liposuction, or can be used as a scar reduction cream.
In other words, the invention provides a new method to obtain the reduction of excess amounts of unaesthetic and/or redundant subcutaneous adipose tissue with non-invasive method, such as injection or topical cream. The product can be used as chemical liposuction agent by injection or topical cellulite cream. When bio-engineered mutant ColH is introduced into subcutaneous adipose tissue of a living animal body, a dissociation and reduction of the adipose tissue at that location occurs. This method is gentle and precise, which does not induce trauma to human body, and does not cause infection.
This invention is also intended to the reduction and removal of lipomas, whether found at the surface of the skin, within the skin, subcutaneous, or anywhere else in the body. Lipomas are generally benign tumors of fatty tissues. Currently, lipomas are removed with surgery, which potentially cause pain and hematoma to patients undergoing the operation. The present invention avoids these problems by introducing into lipoma(s) effective amounts of mutant ColH. This mutant protein is more stable than wild type ColH, yet has lower activity. It melts fat in a slow and mellow fashion, and little bleeding is observed in fat rat dissection experiments. ColH mutant can be developed into a pharmaceutical because it is a single identity, and it is easy for the CMC (chemical manufacture control).
Additional application for this invention is scar reduction, whether found at the surface of the skin. Mutant collagenase can digest over-grown collagen in the raised scar tissue, and thus decrease the height and appearance of scar.
Collagenase purified from regular commercial sources (also from Clostridium histolyticum) is a mixture of 5-6 collagenases. Even if it is highly purified, ColH and ColG, with similar molecular weight and iso-electric points (PIs), are very hard to separate. Thus the highly purified version of collagnease from Clostridium histolyticum still contains a mixture of ColG and ColH. Wild type collagenase purified from regular process induces large amount of bleeding in our fat rat experiments.
The invention may also be used for the treatment of lipomas and other adipose tissues in humans and in animals, in wild life, in human homes, or in zoos.
Human has a layer of adipose tissue, composed largely of linked fat cells under our skin. Our invention can reduce the amount of adipose tissue under our skin by introducing into the tissue effective amounts of single mutant ColH (Clostridium histolyticum). In the patent from Advance Tissues, they use a mixture of collagenase from Clostridium histolyticum, which induces large bleeding in our rat experiments.
1) Mutant ColH's Basis for Lower Activity in Digesting Collagen
The Clostridium histolyticum collagnease has been widely used for the disintegration of connectible tissue and separation of tissue culture cells, because of its broad substrate specificity and its abundance in culture filtrates (Seglen, P. O. 1976. Preparation of isolated rat liver cells. Methods Cell Biol. 13: 29-83). However, at least six different forms with molecular masses ranging from 68 to 125 kD are present in a commercial preparation (Bond, M. D., and Van Wart, H. E., 1984, Characterization of individual collagenases from Clostridium histolyticum. Biochemistry 23: 3085-3091). The difficulty in separating individual enzymes and the lot-to-lot variation of commercial collagenase preparations limit its practical use. Chemical Manufacturing Control (CMC) is quite important in drug development. Each batch of preparation has to be consistent. Thus this difficulty of purification brings potential problems in using collagnease directly purified from Clostridium histolyticum as pharmaceuticals for human use.
ColH gene encode 116 kD collagenase (Yoshihara, K., Matsushita, O., Minami, J., and Okabe, A. Cloning and nucleotide sequence analysis of the colH gene from Clostridium histolyticum encoding a collagnease and a gelatinase. J. Bacteriol. 176: 6489-6496). At its C-terminus, ColH has a 110-residue collagen-binding domain (Wilson, J. J., Matsushita, O., Okabe, A., and Sakon, J. A bacterial collagen-binding domain with novel calcium-binding motif controls domain orientation, EMBO, J. 2003, 22 (8): 1743-1752), which binds to insoluble type I collagen in vitro (Matsushita, O., Yoshihara, K., Katayama, S.-I., Minami, J., and Okabe, A. 1994. Purification and characterization of a Clostridium histolyticum 120-kilodalton collagenase and nucleotide sequence of the corresponding gene. J. Bacteriol. 176: 149-156) and also to collagen fibers in vivo (Nishi, N., Matsushita, K., Yuube, H., Miyanaka, A., Okabe, A., and Wada, F. 1998. Collagen-binding growth factors: production and characterization of functional fusion proteins having a collagen-binding domain. Proc. Natl. Acad., Sci. USA 95: 7018-7023). Thus ColH is quite specific in cutting collagen between fat cells. ColH is able to cleave peptide bonds on the amino side of the glycine residue in PXGP sequence (Peterkofsky, B., 1982. Bacterial collagenase. Methods Enzymol. 82: 453-471). Studies by atomic absorption spectrophotometry and metal replacement with chelators have show that ColH contains one catalytically essential zinc atom per molecule (Angelton, E. L., and Van Wart, H. E. 1988. Preparation and reconstitution with divalent metal ions of class I and class II Clostridium histolyticum appocollagenases. Biochemistry 27: 7406-7412), thus ColH is considered a zinc metalloproteinase.
The N-terminal 80 kD contains the active site of ColH (Matsushita, O., Jung, C.-M., Minami, J., Katayama, S., Nishi, N., and Okabe A. 1998. A study of the collagenase-binding domain of a 116-kDa Clostridium histolyticum collagenase. J. Biol. Chem. 273: 3643-3648). This peptide contains the sequence HEXXH, SEQ ID NO: 14, the zincin consensus motif, which is present in most zinc metalloproteinase (zincin). The zincin superfamily includes the vertebrate collagenases (matrix metalloproteinases [MMPs] as the matrixin subfamily. The alignment of amino acid sequences of isoforms of collagenase ColA, ColG and ColH reveals that they conserve the sequence E446(D at ColG)E447XXXE451, SEQ ID NO: 16, C-terminal to the zincin motif. This could be another binding site for Zinc. Thus when we were looking for a ColH with lower activity than the wild type one, we targeted at HEXXXH, SEQ ID NO: 15, and E446EXXXE451, SEQ ID NO: 16.
According to Jung et al. (Jung, C.-M. et al. Identification of metal ligands in the Clostridium histolyticum ColH collagnease, J. Bacteriology, 1999 May: 2816-2822), the Km values of ColH with E446A and E451A mutations, which decreases enzymatic activity the most of all the Glu446 and Glu451 mutants, were not changed significantly (P, 0.957 and 0.91, respectively), indicating that their substrate (e.g. collagen) binding is not impaired. Therefore, it seems that the mutations do not alter the global three-dimensional structure of the enzyme. On the other hand, their Kcat values decreases significantly, indicating that the catalysis was impaired. Thus our selected mutant ColH E451D binds to its substrate collagen in a normal fashion. It has lower catalytic activity, which means that it cuts collagen slower than wild type ColH. (Note: Km is defined as true dissociation constant of the enzyme substrate complex; Kcat is defined as first order rate constant for the chemical conversion of the Enzyme-substrate complex to the enzyme-product complex). The proposed structure of the catalytic center of ColH is shown in
2) Injection of Mutant ColH into the Fat Cells
It is within the skill of the art to select carriers that are pharmaceutically acceptable, including inertness towards the mutant ColH. Examples are normal saline, aqueous dextran solution, and aqueous hetastarch solution, preferably suitably buffered to neutral pH. One can use as carrier fibrin glue, comprising fibrin or fibrin precursors, e.g. fibrinogen plus thrombin; see U.S. Pat. No. 5,279,825. Again, selection of carrier and methods of preparing formulations are within the skill of the art. Though water and Calcium ions are necessary to activate the enzymes, the aqueous interstitial fluid present in the subcutaneous tissues is sufficient to do this. The above carriers are suitable for injection delivery of mutant ColH in claim 1.
The physician will first select what location(s) in the body she/he wishes to treat. In order to limit the amount of enzymes introduced into the body at one time and to permit a preliminary evaluation of results, a limited area—which may be less than the total area—may be chosen for initial treatment. The treatment solution is injected percutaneously into the subcutaneous adipose tissues, preceded if the physician or patient so desires with a light local anesthesia. For maximum effect from a given quantity of the enzyme solution it should be injected in small quantities at a multiplicity of closely spaced points in the area, preferably spaced not more than about two centimeters apart and even much closer. The best effects are achieved with injections spaced out with time, such as one injection every 3 days or one injection every week for 2 or 3 times.
Our mutant ColH is derived from bio-engineered Coal strain, using E. Coli as host. The potency assay of mutant ColH is based on the digestion of undenatured collagen (from bovine tendon) at pH 7.2 and 37.degree. C. for 5 hours. The number of peptide bonds cleaved is measured by reaction with ninhydrin. Amino groups released by a trypsin digestion control are subtracted. One net ABC unit of collagenase will solublize ninhydrin reactive material equivalent to 1.09 nanomoles of leucine per minute.
Concentrations of enzymes in the pharmaceutically acceptable carrier are chosen on the principle that sufficient liquid is present to diffuse adequately in the subcutaneous fatty tissue yet no more than adequate to carry the desired amount of actives into the area under treatment. A range from about 50 to 500 ABC units collagenase per ml is suitable and considerable latitude within and beyond this range is possible in making the choice for a given situation. Since diffusion into the adipose tissue and the freeing of fat therefrom is seldom complete, it is often desirable to repeat the treatment at least once. This can be done after a few days, for example 3 days or one week.
Injection of mutant collagenase in claim 1 can replace liposuction or be used as an adjunct to liposuction. The treatment is directed to sufficient disruption of the adipose tissue to make it easier to remove by suction. The liposuction stage will follow the application of the invention by one to three days.
Lipomas are normally removed by surgery or liposuction. By use of mutant ColH, the lipomatous tumor can be completely removed. The procedures, carriers, dosages and concentrations described above are applicable to the treatment of lipomas.
3) Topical Anti-Cellulite and Scar Reduction Cream
The modified mutant ColH in claim 1 can be delivered into the fat cells topically with the right transdermal delivery method. The signal peptide that homes the mutant collagenase to the fat cell vasculature helps to by-pass all the collagen in the skin (Nature Medicine 10(6), p625-632, 2004). 70% of human protein is made of collagen. Thus this signal peptide would eliminate side effect of a topical collagenase variant in disturbing the skin structure.
So far very few transdermal technology exists for delivering large proteins into the skin, especially if it is larger than 40 kD. Our modified mutant collagenase is as large as 120 kD. However, one novel transdermal technology using Hydroxysome, or ceramic hydroxyapatite (chemically pure calcium phosphate, U.S. Pat. No. 6,096,324 and U.S. Pat. No. 6,120,782) is able to deliver large proteins, such as 900 KD collagen into epidermis, dermis and fat cell region. Thus in combination with the right transdermal delivery method, our modified mutant collagenase is an effective anti-cellulite cream, which gets to the fat cells and melts fat effectively.
In addition, in combination with the right transdermal delivery method, our modified mutant collagenase is an effective scar reduction cream, which slowly digests over-grown collagen in the scar tissue.
1. Cloning of ColH (GST-ColH, Using pGEX5T-3 Plasmid)
1) DNA of ColH from Dr. Matsushita of Kagawa Medical School, Japan (2 ug, pCHC11)
2) PCR using primers below to get a 2.95 kb DNA fragment (A87) using ColH DNA as template (from Dr. Matsushita).
3) Cut fragment A87 and vector pGEX-5T-3 with restriction enzymes (from New England Biolabs) BamH1 and Xhol. Ligated the cut vector and fragment. Transformed TOP10 cells and plated on Ampicillin (0.1 mg/ml) agarose plate.
4) One colony from the plate had the right sequence of wild type ColH after mini-prep and DNA sequencing.
5) Transformed BL21(E3)/pLysS (from Invitrogen) with pGEX5T-3-ColH (wild type).
2) Introducing E451D mutant.
a) PCR
Fragment 4: PCR Using primers as below, ColH Wild Type cDNA as template:
Fragment 5: PCR Using primers as below, ColH Wild Type cDNA as template:
Fragment 6: PCR Using primers as below, Fragment 1 and 2 as template:
b) Cut Fragment 6 and vector pGEX-5T-3 with restriction enzymes (from New England Biolabs) BamH1 and Xhol. Ligated the cut vector and fragment. Transformed TOP10 cells and plated on Ampicillin (0.1 mg/ml) agarose plate.
c) One colony from the plate had the right sequence of ColH E451D after mini-prep and DNA sequencing.
d) Transformed BL21(E3)/pLysS (from Invitrogen) with pGEX5T-3-ColH (E451D), plated on agarose plate with ampicillin (01 mg/ml) and chroniphenical (0.1 mg/ml).
Conclusion: Both wild type and mutant ColH plasmids were sequenced to verify the sequence authenticity.
3) Introduction of CKGGRAKDC-GG, SEQ ID NO: 8, to the N-terminal of Mutant ColH (E451D) (called ColH-FM)
1) PCR using primers below to get a 2.95 kb DNA fragment (A87) using pGEX5T-3-ColH (E451D) as template (in the above section).
2) Cut fragment LH12 and vector pGEX-5T-3 with restriction enzymes (from New England Biolabs) BamH1 and Xhol. Ligated the cut vector and fragment. Transformed DH5α cells and plated on Ampicillin (0.1 mg/ml) agarose plate.
3) Picked colonies and mini-prep to get DNA and then sequence.
4) Transformed BL21(E3)/pLysS (from Invitrogen) with pGEX5T-3-modified ColH (E451 D).
2. Purification
Reagents:
PGEX5T-3-ColH 451 mutant and pGEX5T-3-modified ColH (E451D)
LB broth (autoclaved)
IPTG, (Ampicillin, Chroniphenical, DTT, PMSF.
Glutathione Agarose Beads (50% slurry in ethanol, Pharmacia)
Factor Xa (Amershan Bioscience, 400 unit, diluted to 1 unit/ul in H2O, 4 degree)
Lysis Buffer: PBS+0.1% NP40+5 mM DTT+0.1 mM PMSF
Wash buffer: PBS+5 mM DTT
Cleavage buffer: 50 mM Tris pH 8.0, 100 mM NaCl, 2.5 mM CaCl2+1 mM DTT
Methods:
Conclusion: purity was around 90% after one step affinity purification.
3. Activity Assay on Mutant ColH and Modified Mutant ColH
Reagents
Procedure
Conclusion: E451D was 20% of collagenase activity from Worthington-biochem.
4. Stability Experiments on ColH Variants
Use protease Trypsin to evaluate the stability of ColH.
Conclusion: E451D was twice as stable as wild type ColH.
5. Fat Rat Experiment on Mutant ColH (E451D) in Melting Fat (Injection)
a) Fat Rat Feeding Protocol
Buy S.D. rats at around 50 g. Feed with the following:
Food to feed: every 100 g of basic food, add pork fat 10 g, milk powder 125 g, egg 60 g, fish oil 10 drops. For the first 1-2 week, each rat gets 13 g of food per day. At week 3, each rat gets 15 g each day. At week 4, each rat gets 17 g each day. So on and so forth. After week 8, the rats are around 200-300 g, ready for experiments.
b) Injection Protocol
0.1 ml of the liquid was injected on each fat pad at hind leg.
It was generally observed that a dose of between about 3 to about 50 ABC units of collagenase per fat pad when injected percutaneously effectively melt the injection side of the fat pad in 24 hours, with very little hemorrhage. It was observed that as the dose was increased, the melting fat effect and the amount of interstitial hemorrhage tended to increase. Dosages of over 50 ABC units and higher resulted in considerable local hemorrhage, but at dosages of 5 to 50 ABC units hemorrhage was very minimum to none.
Animal Model
S.D. rat, male and female.
Mutant E451D ColH Material Used
ABC units collagenase per gram: 163,000
Solvent: sterile normal saline
Anesthesia, injection through stomach (I.P.)
Procedure
The rats were anesthetized by intraperitoneal injection. With each male rat, one fat pad behind one leg was injected with saline, one fat pad behind the other leg was injected with mutant collagenase ColH E451D, 5 unit Additional injections with the same activity unit will be undertaken after two days or three days.
20 S.D. fat rats, 10 female, 10 male (after 8 weeks of feeding starting from 50 g), weighted from 200-300 g. They were injected with ColH E451D at 5 u with 5 different protocols. Each protocol covers 4 rats, 2 female and 2 male.
Experiment A
No. of rats: Four S.D. rats, 2 female and 2 male
Rat 1: male, 261 g; rat 2: male, 312 g; rat 3: female, 232 g; rat 4: female, 239 g.
Test solutions: 5 u ColH E451D in 0.1 mL saline
22 gauge, 8″ needle used
Injections: Solutions slowly infused into fat pad, moving needle. Day 1
Results: Four rats autopsied on Day 3.
Site 1 (one side behind hind leg): saline: Normal fat pad observed.
Site 2 (the other side behind hind leg): 5 u.
Most of fat melted in the area of injection. Very little bleeding is observed. Muscle membrane is not affected. Considerable amount of oily substance observed in the injected sites, which would reflect a reduction or disruption of fat cells.
Experiment B
No. of rats: Four S.D. rats, 2 female and 2 male
Rat 1: male, 256 g; rat 2: male, 249 g; rat 3: female, 221 g; rat 4: female, 250 g.
Test solutions: 5 u ColH E451D in 0.1 mL saline
22 gauge, 8″ needle used
Injections: Solutions slowly infused into fat pad, moving needle. day 1
Results: Four rats autopsied on Day 4.
Site 1 (one side behind hind leg): saline: Normal fat pad observed.
Site 2 (the other side behind hind leg): 5 u.
Fat around injection area is completely melted. Surrounding fat is fragile and detached.
Muscle membrane is not affected. Very little bleeding is observed.
Experiment C
No. of rats: Four S.D. rats, 2 female and 2 male
Rat 1: male, 252 g; rat 2: male, 249 g; rat 3: female, 255 g; rat 4: female, 206 g.
Test solutions: 5 u ColH E451D in 0.1 mL saline
22 gauge, 8″ needle used
Injections:
5 u solutions slowly infused into fat pad, moving needle. Day 1
5 u solutions slowly infused into fat pad, moving needle. Day 3
Results: Four rats autopsied on Day 5.
Site 1 (one side behind hind leg): saline: Normal fat pad observed.
Site 2 (the other side behind hind leg): 5 u.
Most of fat melted (more than 50%) in the area of injection. Little bleeding is observed. Considerable amount of oily substance observed in the injected sites. Remaining fat is detached, fragile, and dead.
Experiment D
No. of rats: Four S.D. rats, 2 female and 2 male
Rat 1: male, 240 g; rat 2: male, 253 g; rat 3: female, 244 g; rat 4: female, 266 g.
Test solutions: 5 u ColH E451D in 0.1 mL saline
22 gauge, 8″ needle used
Injections:
5 u ColH E451D solutions slowly infused into fat pad, moving needle. Day 1
5 u ColH E451D solutions slowly infused into fat pad, moving needle. Day 4
Results: Four rats autopsied on Day 6.
Site 1 (one side behind hind leg): saline: Normal fat pad observed.
Site 2 (the other side behind hind leg): 5 u.
Fat around injection area was completely melted. Muscle membrane was not affected.
Trace amount of blood was observed.
Rat 1:
weight of fat at saline injection area: 1.46 g;
weight of fat at ColH E451D injection area: 1.09 g.
Rat 2:
weight of fat at saline injection area: 1.28 g;
weight of fat at ColH E451D injection area: 1.17 g.
Rat 3:
weight of fat at saline injection area: 1.43 g;
weight of fat at ColH E451D injection area: 1.16 g.
Rat 4:
weight of fat at saline injection area: 1.47 g;
weight of fat at ColH E451D injection area: 1.23 g.
Experiment E
No. of rats: Four S.D. rats, 2 female and 2 male
Rat 1: male, 240 g; rat 2: male, 266 g; rat 3: female, 216 g; rat 4: female, 238 g.
Test solutions: 5 u ColH E451D in 0.1 mL saline
22 gauge, 8″ needle used
Injections:
5 u ColH E451D solutions slowly infused into fat pad, moving needle. Day 1
5 u ColH E451D solutions slowly infused into fat pad, moving needle. Day 3
5 u ColH E451D solutions slowly infused into fat pad, moving needle. Day 5
Results: Four rats autopsied on Day 6.
Site 1 (one side behind hind leg): saline: Normal fat pad observed.
Site 2 (the other side behind hind leg): 5 u.
Fat around injection area is completely melted. Muscle membrane is not affected. Trace amount of blood remains.
Rat 1:
weight of fat at saline injection area: 0.925 g;
weight of fat at ColH E451D injection area: 0.75 g.
Rat 3:
weight of fat at saline injection area: 1.12 g;
weight of fat at ColH E451D injection area: 1.04 g.
Rat 4:
weight of fat at saline injection area: 1.56 g;
weight of fat at ColH E451D injection area: 1.38 g.
6. Fat Rat Experiment on Mutant ColH (E451D) Cream (ColH-FM) Combined with Hydroxysome Transdermal Delivery Method in Melting Fat (Topical)
Research Material
1.1 Experimental Animals:
Male rats, weight 85-95 g, 1 week after stopping breast-feeding.
1.2 Food:
Basic diet is supplied by the animal center. High fat diet composition: 55% basic diet, 12% pork fat, 10% egg, whole fat milk powder 8%, sucrose 5%, peanut 5%, sesame oil 3%, and salt 2%.
1.3 Fat Rat Model Construction:
35 rats were purchased, and fed for a week so that they were familiar with the living environment. These rats later were divided into 2 groups: 1) control rat group (5 rats), fed with basic diet; and 2) fat rat group (30 rats), fed with high fat diet, plus injected under skin 15% MSG saline solution 3 g/kg (once per day), continuously for 5 days. On No. 21 day after the MSG injection, the fat rat group was divided into 6 groups, a) fat rat model group, b) injection high dose group, c) injection median dose group, d) topical high dose group, e) topical median dose group, topical low dose group.
The living environment for these rats were clean, with 12 hours of night time and 12 hours day light each day, with comfortable temperature and good air circulation. Rats could freely eat food and drink water.
1.4 Observation Parameters:
Normal parameters: food intake, urine and faces secretion, and daily activities. Growth parameters: weight, body length, tail length, and Lee's parameters.
1.5 Drug Tested:
Methods
2.1 Group Division:
30 fat rats were randomly divided into 6 groups, with 5 rats per group. Apply solution drug test solution 1.5.2 and control solution to the fat pad on the reproductive organ.
2.2 Dose and Time Duration:
At each dose for 9 days continuously, the animals were injected with test drug solution or applied topically with test drug solution, once per day. The control groups were only applied with control solution topically each day for 9 days. On the 10th day, rats were killed for evaluation.
2.3 Evaluation:
The efficacy of fat reduction was reviewed by observation with native eye and by measuring the weight of the fat pad at tested region.
Results
The fat reduction dissection figures are shown in
Conclusion:
1) Topical application of ColH-FM (modified mutant collagenase) combined with Hydroxysome transdermal technology is effective in eliminating fat under animal's skin.
2) At median dose (10 unit/rat), the fat-melting efficacy of ColH-FM is similar between injection and topical applications.
7. Human Experiment on Mutant ColH (E451D) Cream Combined with Hydroxysome Transdermal Delivery Method in Melting Fat (Topical)
Human test on ColH-FM cream was conducted in Beijing, China in October 2005. The physician is Dr. Yu, Hai Zhou. 15 obese objects were tested with CoH-FM cream at different activity units for 2 weeks in the fat stomach area, by applying the cream once a day in the night. Using ultrasound to test fat tissue thickness, we obtained the results below.
Conclusion:
1) Topical application of ColH-FM (modified mutant collagenase) combined with Hydroxysome transdermal technology is effective in eliminating fat under human skin.
2) The topical product is safe, not inducing allergy or raise blood lipids.
8. Human Experiment on Mutant Coil (E451D) Cream Combined with Hydroxysome Transdermal Delivery Method in Scar Reduction (Topical)
Usage:
Results:
1) Scar History
Male, 38 years old. The scar at hand area was caused by sharp knife in 1999. The only treatment for the wound at the time was to stop bleeding, no stitches. The size of the scar later formed: length 5 cm, width: 0.8 cm.
2) Results
3) Results from Two Other Test Subjects
This application is a §371 application of PCT/CN2008/000333 that was filed on Feb. 13, 2008, which claims priority from the U.S. Provisional Application Nos. 60/901,145, filed on Feb. 14, 2007, now expired.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/CN2008/000333 | 2/13/2008 | WO | 00 | 8/12/2009 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2008/101406 | 8/28/2008 | WO | A |
| Entry |
|---|
| Jung et al., “Identification of Metal Ligands in the Clostridium histolyticum ColH Collagenase”, Journal of Bacteriology, 1999, vol. 181, No. 9, pp. 2816-2822. |
| Number | Date | Country | |
|---|---|---|---|
| 20120164131 A1 | Jun 2012 | US |
| Number | Date | Country | |
|---|---|---|---|
| 60901145 | Feb 2007 | US |
