Method of treating hair loss using diphenylmethane derivatives

Details Method of treating hair loss using diphenylmethane derivatives Method of treating hair loss using diphenylmethane derivatives

2002-03-29

2004-01-20

Spivack, Phyllis G. (Department: 1614)

Drug, bio-affecting and body treating compositions

Designated organic active ingredient containing

Radical -xh acid, or anhydride, acid halide or salt thereof...

Reexamination Certificate

active

06680344

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to methods for treating hair loss in mammals, including arresting and/or reversing hair loss and promoting hair growth.
BACKGROUND OF THE INVENTION
Hair loss is a common problem which occurs, for example, through natural processes or is often chemically promoted through the use of certain therapeutic drugs designed to alleviate conditions such as cancer. Often such hair loss is accompanied by lack of hair regrowth which causes partial or full baldness.
As is well-known in the art, hair growth occurs by a cycle of activity which involves alternating periods of growth and rest. This cycle is often divided into three main stages which are known as anagen, catagen, and telogen. Anagen is the growth phase of the cycle and may be characterized by penetration of the hair follicle deep into the dermis with rapid proliferation of cells which are differentiating to form hair. The next phase is catagen, which is a transitional stage marked by the cessation of cell division, and during which the hair follicle regresses through the dermis and hair growth is ceased. The next phase, telogen, is often characterized as the resting stage during which the regressed follicle contains a germ with tightly packed dermal papilla cells. At telogen, the initiation of a new anagen phase is caused by rapid cell proliferation in the germ, expansion of the dermal papilla, and elaboration of basement membrane components. Wherein hair growth ceases, most of the hair follicles reside in telogen and anagen is not engaged, thus causing the onset of full or partial baldness.
There have been many attempts in the literature to invoke the regrowth of hair by, for example, the promotion or prolongation of anagen. Currently, there are two drugs approved by the United States Food and Drug Administration for the treatment of male pattern baldness: topical minoxidil (marketed as Rogaine® by Pharmacia & Upjohn), and oral finasteride (marketed as Propecia® by Merck & Co., Inc.). For several reasons, however, including safety concerns and/or lack of efficacy, the search for efficacious hair growth inducers is ongoing.
Interestingly, it is known that the thyroid hormone known as thyroxine (“T4”) converts to thyronine (“T3”) in human skin by deiodinase I, a selenoprotein. Selenium deficiency causes a decrease in T3 levels due to a decrease in deiodinase I activity; this reduction in T3 levels is strongly associated with hair loss. Consistent with this observation, hair growth is a reported side effect of administration of T4. See, e.g., Berman, “Peripheral Effects of L-Thyroxine on Hair Growth and Coloration in Cattle”,
Journal of Endocrinology
, Vol. 20, pp. 282-292 (1960); and Gunaratnam, “The Effects of Thyroxine on Hair Growth in the Dog”,
J. Small Anim. Pract
., Vol. 27, pp. 17-29 (1986). Furthermore, T3 and T4 have been the subject of several patent publications relating to treatment of hair loss. See, e.g., Fischer et al., DE 1,617,477, published Jan. 8, 1970; Mortimer, GB 2,138,286, published Oct. 24, 1984; and Lindenbaum, WO 96/25943, assigned to Life Medical Sciences, Inc., published Aug. 29, 1996.
Unfortunately, however, administration of T3 and/or T4 to treat hair loss is not practicable because these thyroid hormones are also known to induce significant cardiotoxicity. See, e.g., Walker et al., U.S. Pat. No. 5,284,971, assigned to Syntex, issued Feb. 8, 1994 and Emmett et al., U.S. Pat. No. 5,061,798, assigned to Smith Kline & French Laboratories, issued Oct. 29, 1991. Surprisingly, however, the present inventors have discovered compounds which promote hair growth without inducing cardiotoxicity. Consistent with this discovery, but without intending to be limited by theory, the present inventors have surprisingly discovered that the compounds useful in the present invention interact strongly with hair-selective thyroid hormone receptors but interact less strongly, or not at all, with heart-selective hormone receptors. These unique properties are, of course, not shared with T3 and/or T4. Accordingly, the compounds described for use in the methods and compositions herein are cardiac-sparing compounds useful for treating hair loss, including arresting and/or reversing hair loss and promoting hair growth.
SUMMARY OF THE INVENTION
The present invention relates to methods for treating hair loss comprising administering a compound which has been found by the present inventors to be particularly useful for treating hair loss in mammals, including arresting and/or reversing hair loss and promoting hair growth. The compounds utilized in the present method have the structure:
and pharmaceutically acceptable salts, hydrates, and biohydrolyzable amides, esters, and imides thereof, wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
, R
8
, R
9
, R
10
, R
11
, and n are defined herein.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to methods of using compounds and compositions which are particularly useful for treating hair loss in mammals, including arresting and/or reversing hair loss and promoting hair growth.
In addition to discovering that the present compounds are useful for treating hair loss, the present inventors have also surprisingly discovered that the preferred compounds are cardiac-sparing. The preferred compounds useful in the method of the present invention are therefore, as defined herein below, cardiac-sparing.
Publications and patents are referred to throughout this disclosure. All references cited herein are hereby incorporated by reference.
All percentages, ratios, and proportions used herein are by weight unless otherwise specified.
In the description of the invention various embodiments and/or individual features are disclosed. As will be apparent to the ordinarily skilled practitioner all combinations of such embodiments and features are possible and can result in preferred executions of the invention.
As used herein, wherein any variable, moiety, group, or the like occurs more than one time in any variable or structure, its definition at each occurrence is independent of its definition at every other occurrence.
Definition and Usage of Terms
The following is a list of definitions for terms used herein:
As used herein, “acyl” refers to the group —C(O)R, where R is lower alkyl or cycloalkyl, for example, acetyl, propionyl, cyclopropionyl, butanoyl, and the like.
As used herein, “alkoxy” is an oxygen radical having an alkyl substituent. Examples of alkoxy radicals include —O-methyl and —O-ethyl.
As used herein, “alkyl” is a saturated, straight or branched chain monovalent hydrocarbon radical. Unless otherwise specified, alkyls have from 1 to about 8 carbon atoms (C
1
-C
8
). Preferred alkyls include, for example, methyl, ethyl, propyl, iso-propyl, tert-butyl, n-butyl, sec-butyl, iso-butyl, n-hexyl, and n-octyl.
As used herein, “aryl” refers to a monovalent unsaturated aromatic carbocyclic radical having a single ring (e.g., phenyl) or two rings (e.g., naphthyl or biphenyl), which may optionally be mono-, di-, or tri-substituted, independently, with hydroxy, —COOH, lower alkyl, lower alkoxy, nitro, amino, alkylamino, dialkylamino, trifluoromethyl, and/or cyano.
As used herein, “biohydrolyzable amides” are amides of the compounds used in the present invention which do not interfere with the activity of the compound, or that are readily converted in vivo by a mammalian subject to yield an active compound.
As used herein, “biohydrolyzable esters” are esters of the compounds used in the present invention which do not interfere with the activity of the compound, or that are readily converted in vivo by a mammalian subject to yield an active compound.
As used herein, “biohydrolyzable imides” are imides of the compounds used in the present invention which do not interfere with the activity of the compound, or that are readily converted in vivo by a mammalian subject to yield an active compound.
As used herein, “cycloalkyl” is a monovalent monocyclic hydrocarbon radical having from three to eight carbon atoms, such as cyclopropyl, cyclobut

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