WO2002064178A1 - Use of green tea extract for wound healing - Google Patents
Use of green tea extract for wound healing Download PDFInfo
- Publication number
- WO2002064178A1 WO2002064178A1 PCT/GB2002/000627 GB0200627W WO02064178A1 WO 2002064178 A1 WO2002064178 A1 WO 2002064178A1 GB 0200627 W GB0200627 W GB 0200627W WO 02064178 A1 WO02064178 A1 WO 02064178A1
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- WIPO (PCT)
- Prior art keywords
- gte
- medium
- cells
- wound
- days
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/40—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing ingredients of undetermined constitution or reaction products thereof, e.g. plant or animal extracts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K36/00—Medicinal preparations of undetermined constitution containing material from algae, lichens, fungi or plants, or derivatives thereof, e.g. traditional herbal medicines
- A61K36/18—Magnoliophyta (angiosperms)
- A61K36/185—Magnoliopsida (dicotyledons)
- A61K36/82—Theaceae (Tea family), e.g. camellia
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P17/00—Drugs for dermatological disorders
- A61P17/02—Drugs for dermatological disorders for treating wounds, ulcers, burns, scars, keloids, or the like
Definitions
- the present invention relates to the healing of wounds and, more specifically, to a product for topical application to the wound in order to facilitate effective healing.
- wound is to be construed as a trauma wound that penetrates the skin. Examples are wounds caused in an accident or by a third degree burn or deep ulcers such as bedsores and venous ulcers.
- the invention relates to the use of extracts of green tea for the manufacture of a medicament for the treatment of such wounds to facilitate effective healing.
- Fibroblasts are cells that draw the wound together. Controlling the rate of proliferation of the fibroblasts can h ' c an effect on whether a scar is left when the wound heals as well as on the speed of healing.
- HDMEC human dermal microvascular endothelial cells
- a wound is healed effectively if it is healed quickly and without leaving a scar. To some extent, compromise is necessary as to speed in order to allow time for a continuous layer of skin to form over the wound. Over rapid healing may result in the unsightly puckering of the wound edges.
- US-A- 6022862 assigned to VimRx Pharmaceuticals, Inc. suggests contacting a wound with an effective wound-healing amount of a composition comprising a pseudopterosin or pseudopterosin derivative. This is believed to promote the growth and proliferation of keratinocytes, fibroblasts and endothelial cells.
- the pseudopterosins are a class of natural products isolated from the sea whip Pseudopterogorgia.
- GTE green tea extracts
- GTE Globalstar tiosis tiosis .
- concentrations in excess of lmg/ml are typically employed.
- Topical use of GTE for treatment of various skin infections has been proposed.
- GB-A-2293 548 describes a treatment for Herpes.
- DE-A-198 38 918 describes a treatment for eczema and JP 10218784 suggests a treatment for allergic dermatitis.
- the GTE is primarily proposed for the treatment of the infection as a result of which the skin lesions can be expected to heal naturally.
- WO 00/47193 A2 discloses the use of GTE to treat a variety of conditions relating to angiogenesis, including wound granulation and scar formation. Therefore these treatments are for cases where there has been excessive blood vessel regeneration such as may occur after a wound has healed ineffectively.
- the experimental work described by Karolinska demonstrates that EGCG (Epigallocatechin-3 gallate) - one of the major catechins present ion GTE inhibits microvascular endothelial cell proliferation. This suggests that GTE would not be useful in wound healing.
- Karolinska does not propose the topical application of GTE to a wound and is therefore directed to a different medical use.
- green tea extracts in appropriate concentrations preferably in the range 0.1 to less than 10.0 ⁇ g/ml (or g) can increase the proliferation of human keratinocytes in order to promote more rapid healing.
- the antioxidant and antibacterial effects of catechins found in green tea extracts is documented.
- GTE for enhancing effective wound healing by a direct effect on cell proliferation has not previously been appreciated or exploited.
- an extract of green tea may result in inhibition of proliferation of human fibroblasts. Since it has been established that this inhibition is reversible then controlling the amount of green tea to which the wound is exposed during the healing process can be used to control the possibility of scarring more precisely. For example if fibroblast proliferation is inhibited until a sufficient quantity of keratinocyte cells have been generated to restore the epidermal layer, the risk of scar formation and uneven healing may be reduced.
- Figure 1 shows the results from Experiment 1 in lest A using normal human keratinocytes
- Figure 2 shows the results from Experiment 2 in Test A using normal human keratinocytes
- Figure 3 shows the results from Experiment 1 in Test B using normal human dermal fibroblasts
- Figure 4 shows the results from Experiment 2 in Test B using normal human dermal fibroblasts
- FIG 5 shows photographs of the results from Experiment 1 in Test C wherein;
- photograph a shows a control sample after four days in a base support medium
- photograph b shows the sample with 10 ⁇ g/ml GTE after four days in a base support medium
- photograph c shows the sample treated with GTE after seven days, the medium having been changed to a full support medium on day 4;
- photograph d shows the sample treated with GTE after seven days, the medium having been changed for further base support medium on day 4;
- photograph e shows the sample treated with GTE after ten days, the medium having been changed to a full support medium on day 4;
- photograph f shows the sample treated with GTE after ten days, the medium having been changed for further base support medium on day 4;
- Figure 6 shows the results from Experiment 1 Section 4 in Test C wherein;
- photograph a shows a control sample after twelve days in a base support medium.
- photograph b shows the control sample after sixteen days, the medium having been changed to a full support medium on day 12;
- photograph c shows the sample with lO ⁇ g/ml GTE after twelve days in a base support medium
- photograph d shows the sample treated with GTE after sixteen days the medium having been changed for further base support medium on day 12;
- photograph e shows the sample treated with GTE after sixteen days the medium having been changed to a full support medium on day 12.
- FIG. 7 shows the results from Experiment 2 Section 1 in Test C wherein:
- photograph a shows the sample with lO ⁇ g/ml TGE after four days in a base support medium
- photograph b shows the sample with 10 ⁇ g/ml GTE after seven days in a base support medium
- photograph c shows the sample treated with GTE after seven days, the medium having been changed for further base support medium on day four;
- photograph d shows the sample treated with GTE after seven days, the medium having been changed to a full support medium on day four;
- photograph e shows the sample with lO ⁇ g/ml GTE afer ten days in a base support medium
- photograph f shows the sample treated with GTE after ten days, the 5 medium having been changed for further base support medium on day 4;
- photograph g shows the sample treated with GTE after ten days, the medium having been changed to a full support medium on day 4.
- Figure 8 shows the results from Experiment 2 Section 2 in Test C wherein:
- photograph a shows the sample with lO ⁇ g/ml GTE after seven days in a o base support medium
- photograph b shows the sample with lO ⁇ g/ml GTE after ten days in a base support medium
- photograph c shows the sample treated with GTE after ten days, the medium having been changed for further base support medium at day 5 seven;
- photograph d shows the sample treated with GTE after ten days, the medium having been changed to a full support medium on day seven;
- photograph e shows the sample with lO ⁇ g/ml GTE after thirteen days in a base support medium
- o photograph f shows the sample treated with GTE after thirteen days, the medium having been changed for further base support medium at day seven;
- photograph g shows the sample treated with GTE after thirteen days, the medium having been changed for a full support medium on day seven.
- FIG 9 shows the results from Experiment 1 in Test E using human dermal microvascular endothelial cell (HDMEC)
- Figure 10 shows the results from Experiment 2 in Test E using human dermal micovascular endothelial cells (HDMEC).
- HDMEC human dermal micovascular endothelial cells
- a product for topical application to a wound is prepared by dissolution or incorporation of an extract of green tea in a suitable base.
- the product can be prepared for application in a number of dosage forms including, but not restricted to, sterile liquids, ointments or powders or embedded in suitable soluble or non-soluble dressings.
- concentration of the green tea extract is in the range 0.1 to 10 ⁇ g/ml (or g).
- Green tea extract will normally be quantified on up to eight different catechins in varying proportions and at a preferred concentration of green tea extract in the range 0.1 ⁇ g to 10 ⁇ g/ml(or g) this will deliver 0.025 to 2.5 ⁇ g/ml(or ) of catechins in the dosage form.
- Test A to establish the effect of GTE on the growth of normal human keratinocytes
- Test B to establish the effect of GTE on the growth of normal human dermal fibroblasts
- Test C to determine the degree of reversibility of GTE on the effect on the growth of normal human dermal fibroblasts
- Test E to establish the effect of GTE on the proliferation of human dermal microvascular endothelial cells (HDMEC).
- the basal medium contains all the nutrients such as amino acids, vitamins and glucose, but does not contain the growth factors which are essential for keratinocyte o proliferation. It is known that normal human keratinocytes maintained in growth factor- deficient medium go into irreversible growth arrest [Pittlelkow, 1986], but it would appear that GTE contains a component that has either a protective effect or acts as a growth factor for keratinocytes.
- GTE were significantly higher (p ⁇ 0.05) than when the GTE was first added although they decreased during the following four days as did the number of cells in control medium.
- the number of cells in 10.0 ⁇ g/ml remained approximately the same during the eight days of the experiment.
- Fibroblasts were seeded at a lower density to maintain cells in a non-confluent state throughout the experiment. The trend to decreased growth in GTE was more marked than in the first Experiment 1 ( Figure 4). By day 7 the numbers of fibroblasts in 1.0 ⁇ g/ml appeared to recover and were not significantly different from those in 0.1 ⁇ g/ml. Although numbers were lower than in control medium the difference did not reach statistical significance. The number of fibroblasts in 10.0 ⁇ g/ml of GTE decreased to 30% of controls (p ⁇ 0.001). Summary of effect on growth of normal human dermal fibroblasts
- HDMEC cells were grown in modified EGM-2 MV medium containing 1.5% FBS (Foetal Bovine Serum). Numbers of control cells at days 4 and 7 were 155% and 174%> respectively of the numbers on day 0. No toxicity was observed and cell growth was slightly increased in all concentrations of GTE ( Figure 9) with statistical significance reached in the 1.0 ⁇ g/ml concentration on day 7 (117%o of control, p ⁇ 0.03).
- FBS Fetal Bovine Serum
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Natural Medicines & Medicinal Plants (AREA)
- Chemical & Material Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Engineering & Computer Science (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- General Health & Medical Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Pharmacology & Pharmacy (AREA)
- Epidemiology (AREA)
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- Alternative & Traditional Medicine (AREA)
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- Medical Informatics (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Dermatology (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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Abstract
Description
Claims
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0103742.3 | 2001-02-15 | ||
GBGB0103742.3A GB0103742D0 (en) | 2001-02-15 | 2001-02-15 | Wound healing |
GB0203153.2 | 2002-02-11 | ||
GB0203153A GB2372210A (en) | 2001-02-15 | 2002-02-11 | Wound healing |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002064178A1 true WO2002064178A1 (en) | 2002-08-22 |
Family
ID=26245716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2002/000627 WO2002064178A1 (en) | 2001-02-15 | 2002-02-14 | Use of green tea extract for wound healing |
Country Status (1)
Country | Link |
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WO (1) | WO2002064178A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4138192A1 (en) * | 1990-08-30 | 1993-05-27 | Karin Omlor | Topical medicament comprising microbial culture - in decoction of sugar-cane juice and green tea |
WO1996009833A1 (en) * | 1994-09-29 | 1996-04-04 | Joan Louise Hibberd | Treatment of viral infections |
WO1998033494A1 (en) * | 1997-02-04 | 1998-08-06 | Kosbab John V | Compositions and methods for prevention and treatment of vascular degenerative diseases |
DE19838918A1 (en) * | 1998-08-27 | 2000-03-09 | Sylvia Rasch | Composition for the topical treatment of skin disorders, especially eczema, comprises green tea or derivative, salicylic acid or acetylsalicylic acid, as well as vitamin C |
WO2000047193A2 (en) * | 1999-02-12 | 2000-08-17 | Karolinska Innovations Ab | Inhibition of angiogenesis with epigallocatechin-3-gallate |
-
2002
- 2002-02-14 WO PCT/GB2002/000627 patent/WO2002064178A1/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4138192A1 (en) * | 1990-08-30 | 1993-05-27 | Karin Omlor | Topical medicament comprising microbial culture - in decoction of sugar-cane juice and green tea |
WO1996009833A1 (en) * | 1994-09-29 | 1996-04-04 | Joan Louise Hibberd | Treatment of viral infections |
WO1998033494A1 (en) * | 1997-02-04 | 1998-08-06 | Kosbab John V | Compositions and methods for prevention and treatment of vascular degenerative diseases |
DE19838918A1 (en) * | 1998-08-27 | 2000-03-09 | Sylvia Rasch | Composition for the topical treatment of skin disorders, especially eczema, comprises green tea or derivative, salicylic acid or acetylsalicylic acid, as well as vitamin C |
WO2000047193A2 (en) * | 1999-02-12 | 2000-08-17 | Karolinska Innovations Ab | Inhibition of angiogenesis with epigallocatechin-3-gallate |
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