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Photodynamic therapy for the treatment of hair loss

a technology of photodynamic therapy and hair loss, applied in the field of photodynamic therapy, can solve the problems of anti-androgenic side effects, inconvenient use, and disappearance of benefits, and achieve the effect of increasing hair growth and increasing hair growth

Inactive Publication Date: 2008-03-06
QLT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The patent text describes a method for treating hair loss and stimulating hair growth using photodynamic therapy (PDT). The method involves administering a photosensitizer to the skin and then irradiating the area with light to activate the photosensitizer. The treatment can increase the number of hairs and restore hair growth in areas where it is needed. The method can be repeated over time to achieve the desired results. The invention also includes pharmaceutical compositions containing photosensitizers for the treatment of hair loss. Overall, the invention provides a non-invasive and effective treatment for hair loss and stimulation of hair growth."

Problems solved by technology

Minoxidil must be applied topically on a twice daily basis, and is therefore somewhat inconvenient to use.
However, this benefit disappears over time or once the treatment is stopped.
This treatment has marginal efficacy, requires daily oral administration and can have some anti-androgenic side effects such as alteration of libido.
These procedures are too expensive or time consuming for many people.
In addition, many people are put off by the surgical nature of the treatment.
Major drawbacks of these treatments are side effects, which can be local or systemic in nature.
Photochemotherapy therapy for AA using psoralen and high energy UVA (PUVA) treatment has met with very limited success and its effectiveness for AA is in doubt (Lebwohl, M.
Side effects included unpleasant reddish skin coloration for several hours and sometimes burning sensations during the irradiation phase.

Method used

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  • Photodynamic therapy for the treatment of hair loss
  • Photodynamic therapy for the treatment of hair loss
  • Photodynamic therapy for the treatment of hair loss

Examples

Experimental program
Comparison scheme
Effect test

example 1

Photodynamic Therapy Treatment of C57BL / 6 Mice with Alopecia of Unknown Etiology

[0125] C57BL / 6 mice used in this example were purchased from Jackson Laboratories (Bar Harbor, Me.). After 4 weeks of housing some of the C57BL / 6 mice spontaneously developed a hair loss condition which resulted in large bald patches (see FIG. 1.1) at 12 to 14 weeks of age. One of these animals was sacrificed and skin samples were sent for histopathological evaluation. The skin sample showed no evidence of infection according to a veterinarian's histopathological examination. The condition was diagnosed as alopecia of unknown etiology. The presence of an undefined “mononuclear cell infiltrate” was noted within the affected skin and, without being bound by theory, may indicate an autoimmune etiology for alopecia in the mouse.

[0126] Eight mice that were developing hair loss were chosen. Four mice were randomly picked for the PDT treatment while the remaining four served as untreated controls. PDT consist...

example 2

PDT-Induced Stimulation of Hair Growth Using Topically-Applied Photosensitizer

[0128] To prepare QLT 0074-containing ointment, QLT 0074 photosensitizer was dissolved in glacial acetic acid to solubilize it. The solution was then frozen in a dry ice / isopropanol bath and the acetic acid was removed by lyophilization. The resultant material was a fine fluffy powder. Analytical testing of the cryodessicated QLT 0074 indicated that the process did not cause degradation. The ointment base was prepared by first warming polyethylene glycol 200 (PEG 200) to 80-90° C. with stirring. Polyethylene glycol 3350 (PEG 3.35K) was then added with stirring, followed by oleyl alcohol, and then diethylene glycol monoethyl ether. Stirring was continued until the solution was clear. The ointment base was cooled to approximately 50° C., and the QLT 0074 was added with stirring. Stirring was continued as the mixture cooled, until a homogenous paste was achieved. The ointment contained the following proporti...

example 3

Optimization of Irradiation Dose and Timing for Photodynamic Treatment of Alopecia Areata After Intravenous Injection of Photosensitizer

[0139] This example examines the effect of different irradiation protocols on PDT treatment of alopecic mice as described above.

[0140] Alopecic mice are divided into control and treatment groups. The treatment mice are injected with verteporfin in a lipid-based formulation at 1 mg / kg of body weight, and the control group are mock injected. Mice from both groups are exposed to red light at the following doses: 1, 2, 5, 10 and 20 J / cm2 light LED at 1 hour post-injection, in a manner as described above in Example 1. Two additional PDT treatments are administered on days 7 and 14 post photosensitizer administration. All mice are monitored over a 5 week period, photographed pre-treatment and on days 6, 13, 20, 27, and 34 post irradiation, and with biopsies taken for histopathological analysis.

[0141] In a separate experiment, alopecic mice are divided ...

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Abstract

Photodynamic therapy (PDT) is used to stimulate and / or restore hair growth in areas of hair loss. Methods and compositions relating to PDT treatment for alopecia are disclosed. In light of PDT use to remove unwanted hair by inactivating or destroying hair follicles or destroying the tissue feeding the hair follicles, such methods and compositions relate to a surprising and unexpected discovery. PDT permits a means to treat conditions relating to hair loss such as androgenic alopecia, alopecia areata and drug-induced alopecia.

Description

RELATED APPLICATIONS [0001] This application is a divisional application of U.S. patent Ser. No. 10 / 422,363, filed Apr. 23, 2003, which is a continuation-in-part of U.S. patent Ser. No. 10 / 291,795, filed Nov. 8, 2002, and claims priority to U.S. Provisional Ser. No. 60 / 338,295, filed Nov. 9, 2001, each of which are both hereby incorporated in their entireties as if fully set forth.FIELD OF THE INVENTION [0002] This invention relates to the use of photodynamic therapy (PDT) and the use of PDT with appropriate photosensitizers to stimulate hair growth. In particular, the use of photosensitizers and PDT for treating conditions relating to hair loss, such as androgenetic alopecia and alopecia areata, is described. The present invention further relates to increases in proinflammatory cytokines induced by PDT, which stimulates hair growth, as well as to methods of determining the level of hair growth stimulation mediated by PDT. BACKGROUND OF THE INVENTION [0003] Alopecia is the general t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K49/00A61K31/555A61P17/14A61K8/49A61K9/00A61K31/40A61K41/00A61K47/10A61N5/06A61Q7/00
CPCA61K8/4913A61K9/0014A61K9/0019A61K31/40A61K31/555A61K47/10A61K41/0076A61K2800/81A61N5/0617A61N5/062A61Q7/00A61K41/0061A61K41/0071A61K2800/434A61K31/409A61K45/06A61P17/14A61K2300/00
Inventor SIMKIM, GUILLERMO O.RICHTER, ANNA M.HUNT, DAVID W.C.NORTH, JOHN ROBERTLUTWYCHE, PETERBOCH, RONALD ERWINHOULE, JEAN-MARIE
Owner QLT INC
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